DESC:FIELD OF THE INVENTION:
This invention relates to the field of electrical and electronics engineering.

Particularly, this invention relates to the field of lights, LEDs, and luminaires; and, their driving circuits.

Specifically, this invention relates to a smart, durable, LED light system with a dual-core.

BACKGROUND OF THE INVENTION:
Typically, a LED bulb / tube / lighting consists of a LED package / chip / board, Circuit Board / Driver (for Power Systems), Circuit Board / Driver (for Control Circuitry), Heat Sink, Base, Optics / Lens etc.

It is known that the lifetime of a bulb / tube can be no longer than the lifetime of any of its components. Standard lifetime of an LED is typically 35,000 - 50,000 hours. But, since, the LED bulbs / tubes contain a number of parts; any one might be responsible for failures; which is why an LED never serves its standard predicated lifetime of 35,000 - 50,000 hours.

The US Department of Energy (DoE)’s solid-state lighting program supports research and development of LED technologies, and their website contains volumes of data on LED lighting systems. Their Lifetime and Reliability Fact Sheet contains data on the failure rate of 5,400 outdoor lamps over 34 million hours of operation. In this data, interestingly, LEDs, themselves, account for only 10% of the failures; driver circuitry, on the other hand, was responsible almost 60% of the time for failures. The remainder, of failures, was due to housing problems, which may not be as applicable for bulbs in indoor use. The table, below, shows such reasons vis-à-vis percentages:
Reasons for Failure Percentage (%)
Driver (Power System) 52%
Driver (Control Circuitry) 7%
LED Package 10%
Housing/ Heat Sink 31%

The above data shows that the major failures are because of poor quality power supplies.

In India, and even in so many other countries, power fluctuation is very common and inevitable. Excessive fluctuation and voltage surge will, eventually, burn out an LED Driver and / or LED package; ultimately, resulting in LED bulb / tube failure.

Typically, the cost of driver / circuit board and LED package / chip in LED bulb / tube is 15-20% and 4-5%, respectively, of its retail price. But, when either of driver / circuit board and LED package / chip fails, nobody repairs / replaces the driver / LED Chip but goes for a new LED bulb / tube.

OBJECTS OF THE INVENTION:
An object of the invention is to enhance longevity of lights.

SUMMARY OF THE INVENTION:
According to this invention, there is provided a smart, durable, LED light system with a dual-core comprising:
- a series-parallel module, comprising one or more circuit boards, for illuminating one or more illuminating bodies, each circuit board corresponding to a single illuminating body;
- a driver base module which drives said illuminating bodies by a DC supply, said driver base module comprising a dual core with a first core and a second core, in that:
o said first core comprising a main (primary) circuit being a first driver module; and
o said second core comprising an auxiliary (secondary) circuit being a second driver module;
- a first DPDT Switch configured to enable a user to choose which of said cores, selectable from said first core and said second core, to select,
o said first core being a first driver comprising a first rectifier and a first constant current driver IC;
o said second core being a second driver comprising a second rectifier and a second constant current driver IC; and
- a second DPDT Switch configured to enable a user to choose, to which of said circuit boards, selectable from one or more illuminating body circuit boards, to select, in order for DC supply to be given to one of said selected board.

In at least an embodiment, said one or more illuminating body circuit boards comprising:
- a first output board connected to a plurality of illuminating bodies such that when supply is provided by said second switch to said first board, each of said plurality of illuminating bodies are illuminated; and
- a second output board connected to said plurality of illuminating bodies such that when supply is provided by said second switch to said second board, each of said plurality of illuminating bodies are illuminated.

In at least an embodiment, said series-parallel module being a circuit board for illuminating said illuminating bodies.

In at least an embodiment, said driver base module being a circuit board for a driver assembly.

In at least an embodiment,
- said first core being a main (primary) circuit comprising a first rectifier, a first constant current driver IC, and first choke, in that,
o said first core being coupled to a first bridge rectifier for switching AC voltage to DC voltage;
o said DC voltage being given to a coupled the first constant current driver IC which is used for giving constant current flow to further parts of said system; and
o said first choke being a driver transformer configured to maintain power factor to obtain DC constant current to be given to said DPDT Switch.

In at least an embodiment, second core being a auxiliary (secondary) circuit comprising a second rectifier, a second constant current driver IC, and a second choke.

In at least an embodiment, said system comprising a Chip-on-Board (COB) base consisting of a circuit board for a driver assembly and for a coupled corresponding illuminating body, in that,
- said first DPDT switch configured for switching between main (primary) driver and auxiliary (secondary) driver – in case any single driver fails; and
- said second DPDT switch configured for switching between a first output board and a second output board – in case any single board fails.

In at least an embodiment, said system comprising an Application-Specific Integrated Circuit (ASIC) Base, said ASIC base comprising a single board, a single IC solution, for a driver assembly and for a coupled corresponding illuminating body, said ASIC base comprising at least two pins on an ASIC driver at its input supply side, in that,
- selection of a first pin leads to selection of first DPDT switch, said first DPDT switch configured for switching between main (primary) driver and auxiliary (secondary) driver – in case any single driver fails; and
- selection of a second pin leads to selection of second DPDT switch, said second DPDT switch configured for switching between a first output board and a second output board – in case any single board fails.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The invention will now be described in relation to the accompanying drawings, in which:
FIGURE 1 illustrates a schematic circuit drawing of the driver base module, of this invention, as stated above;
FIGURE 2 illustrates a schematic circuit drawing of the second embodiment, of this invention, as stated above;
FIGURE 3 illustrates a schematic circuit drawing of the Application-Specific Integrated Circuit (ASIC) Base, of this invention, as stated above; and
FIGURE 4 illustrates a schematic circuit drawing of the pluggable auxiliary driver design, of this invention, as stated above.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided a smart, durable, LED light system with a dual-core.

In at least an embodiment, this invention teaches a smart, dual core and artificial intelligent, series-parallel LED chip circuit for lights (LED bulbs / tubes). This, with the help of a smart / enhanced protection driver design, limits damage occurring due to unavoidable power fluctuation/s and isolates rest of components of the light and / or its driver(s).

In at least an embodiment, the system, of this invention, comprises a driver circuit board, which drives the light, the driver circuit board further comprises a first core comprising a main (primary) circuit and a second core comprising an auxiliary (secondary) circuit such that if one fails, the other backs it up.

In at least an embodiment, the system, of this invention, comprises an auxiliary (secondary) LED package / board and a main (primary) LED package / board such that if one fails, the other backs it up.

In at least an embodiment, the system, of this invention, comprises a driver base module or a discrete / surface-mounted device (SMD) base; this requires two circuit boards – one for driver and one for light / LED.

FIGURE 1 illustrates a schematic circuit drawing of the driver base module, of this invention, as stated above.

In at least an embodiment of the driver base module, the discrete / surface-mounted device (SMD) base comprises at least two circuit boards; a first circuit board for a driver assembly and a second circuit board for a light / LED.

In at least an embodiment of the driver base module, AC input (1), typically of 230V, is given to a first DPDT Switch (2).

The first DPDT Switch (2) enable a user to choose to which Driver (that is comprising rectifier, constant current driver IC, and Choke) the AC input supply is to be given. There are, typically, two Drivers. The first Driver comprises a first rectifier (3), a first constant current driver IC (5), and first choke (7). The second Driver comprises a second rectifier (4), a second constant current driver IC (6), and a second choke (8).

When the user chooses to supply AC input to, say, first Driver, the AC input supply goes to the first bridge rectifier (3) for switching AC voltage to DC. DC Supply is, then, given to the first constant current driver IC (5) which is used for giving constant current flow to further parts of this circuit. The first choke (7) is like driver transformer, maintains power factor. Then, the DC constant current is given to a second DPDT Switch (9).

The second DPDT Switch (9) enables the user to choose, to which LED circuit board, the DC supply is to be given. There will be at least two LED Boards (10, 11).

When the user switches the DC supply to a first LED Board (10), then all the LEDs on that particular LED board will get illuminated.

In at least an embodiment of the driver base module, the first DPDT switch (2) is used for switching between the main (primary) circuit (3, 5, 7) and the auxiliary (secondary) circuit (4, 6, 8). This switching between the main (primary) circuit (3, 5, 7) and the auxiliary (secondary) circuit (4, 6, 8) is decided depending on which circuit is functional; preference is provided to the main (primary) circuit (3, 5, 7) – in case, any of the components of the main (primary) circuit (3, 5, 7) fails, auxiliary (secondary) circuit (4, 6, 8) is activated by switching provisioned by the first DPDT switch (2) which shifts the supply from the main (primary) circuit (3, 5, 7) to the auxiliary (secondary) circuit (4, 6, 8).

In at least an embodiment of the driver base module, the second DPDT switch (9) is used for switching between a first output board (10) and a second output board (11) in case any single board fails. Each board is coupled with a light / LED which is driven by power. This switching between the first output board (10) and the second output board (11) is decided depending on which output board is functional; preference is provided to the first output board (10) – in case, any of the components of the first output board (10) fails, a second output board (11) is activated by switching provisioned by the second DPDT switch (9) which shifts the supply from the first output board (10) to the second output board (11).

In at least an embodiment, the system, of this invention, comprises a Chip-on-Board (COB) base.

FIGURE 2 illustrates a schematic circuit drawing of the second embodiment, of this invention, as stated above.

In at least an embodiment of the Chip-on-Board (COB) base, the base comprises only one circuit board for a driver assembly and for a light / LED.

In at least an embodiment of the Chip-on-Board (COB) base, AC input (1), typically of 230V, is given to the first DPDT Switch (2).

The first DPDT Switch (2) enables the user to choose to which Driver (that comprises rectifier, constant current driver IC) the AC input supply is to be given. There will be at least two Drivers. The first Driver comprises a first rectifier (3) and a first constant current driver IC (5). The second Driver comprises a second rectifier (4) and a second constant current driver IC (6).

When the user chooses to supply AC input to, say, first Driver, the AC input supply goes to the first bridge rectifier (3) for switching AC voltage to DC. DC Supply is, then, given to the first constant current driver IC (5) which is used for giving constant current flow to further parts of this circuit. Then, the DC constant current is given to the second DPDT Switch (7).

The second DPDT Switch (7) enables the user to choose, to which LED circuit board, DC supply is to be given. There will be at least two LED Boards (10, 11). When the User switches the DC supply to a first LED Board (10), then all the LEDs on that particular LED board will get illuminated.

In at least an embodiment of the Chip-on-Board (COB) base, the first DPDT switch (2) is used for switching between main (primary) driver (3, 5) and auxiliary (secondary) driver (4, 6); in case any single driver fails. This switching between the main (primary) driver (3, 5) and the auxiliary (secondary) driver (4, 6) is decided depending on which driver is functional; preference is provided to the main (primary) driver (3, 5) – in case, any of the components of the main (primary) driver (3, 5) fails, auxiliary (secondary) driver (4, 6) is activated by switching provisioned by the first DPDT switch (2) which shifts the supply from the main (primary) driver (3, 5) to the auxiliary (secondary) driver (4, 6).

In at least an embodiment of the Chip-on-Board (COB) base, the second DPDT switch (2) is used for switching between a first output light / LED board (10) and a second output light / LED board (11) in case any single board fails. Each board is coupled with a light / LED which is driven by power. This switching between the first output board (10) and the second output board (11) is decided depending on which output board is functional; preference is provided to the first output board (10) – in case, any of the components of the first output board (10) fails, a second output board (11) is activated by switching provisioned by the second DPDT switch (7) which shifts the supply from the first output board (10) to the second output board (11).

In at least an embodiment, the system, of this invention, comprises an Application-Specific Integrated Circuit (ASIC) Base.

FIGURE 3 illustrates a schematic circuit drawing of the Application-Specific Integrated Circuit (ASIC) Base, of this invention, as stated above.

In at least an embodiment of the Application-Specific Integrated Circuit (ASIC) Base, there comprises a single board, a single IC solution, for a driver assembly and for a light / LED.

In at least an embodiment of the Application-Specific Integrated Circuit (ASIC) Base, AC input (1), typically of 230V, is given to a first DPDT Switch (2).

The first DPDT Switch (2) enables the user to choose to which pins of ASIC Driver (that functions as rectifier, constant current driver, and choke) the AC input supply is to be given. There are at least two driver circuitries (each of rectifier, constant current driver, choke) within one ASIC. There are at least two pins on the ASIC Driver at input supply side, say, A and B. A first Driver circuit is linked to the pin A and a second Diver circuit is linked to the pin B.

When the user chooses to supply AC input supply to, say, pin A of the ASIC Driver, the AC input supply goes to the first Driver circuit within the ASIC, that converts AC input supply into a DC constant current. Then, the DC constant current is given to DPDT Switch (7).

A second DPDT Switch (7) enables the user to choose, to which LED circuit board, the DC supply is to be given. There will be at least two LED Boards (5, 6). When the User switches the DC supply to a first LED Board (5), then all the LEDs on that particular LED board will get illuminated.

In at least an embodiment of the Application-Specific Integrated Circuit (ASIC) Base, the first DPDT switch (2) is used for switching between main (primary) driver and auxiliary (secondary) driver; in case any single driver fails. This switching between the main (primary) driver and the auxiliary (secondary) driver is decided depending on which driver is functional; preference is provided to the main (primary) driver – in case, any of the components of the main (primary) driver fails, auxiliary (secondary) driver is activated by switching provisioned by the first DPDT switch (2) which shifts the supply from the main (primary) driver to the auxiliary (secondary) driver.

In at least an embodiment of the Application-Specific Integrated Circuit (ASIC) Base, the second DPDT switch (7) is used for switching between the first output light / LED board (5) and the second output light / LED board (6) in case any single board fails. Each board is coupled with a light / LED which is driven by power. This switching between the first output board (5) and the second output board (6) is decided depending on which output board is functional; preference is provided to the first output board (5) – in case, any of the components of the first output board (5) fails, a second output board (6) is activated by switching provisioned by the second DPDT switch (7) which shifts the supply from the first output board (5) to the second output board (6).

In at least an embodiment, pluggable auxiliary driver design is provided.

FIGURE 4 illustrates a schematic circuit drawing of the pluggable auxiliary driver design, of this invention, as stated above.

In at least an embodiment of the pluggable auxiliary driver design, AC input (1), typically of 230V, is given to a pluggable auxiliary driver (4) which is encapsulated in a separate box with a first set of two pins, for AC input supply, and a second set of two pins, for DC constant current output, is used for bridge rectifier, for constant current flow through the further circuit, and for choke.

In case the pluggable driver fails due to any reason, it can be easily removed / un-plugged manually and a new pluggable driver, encapsulated in a separate box with two pins for AC input supply and two pins for DC constant current output, can be plugged-in / inserted in same place. A slot for the driver is placed on the LED light cover / frame / base suitably such that user can remove and insert it easily from outside without opening the cover / base / diffuser just like one removes / inserts a battery cell. The driver converts AC input supply into DC constant current. Then, the DC constant current is given to a DPDT Switch (2).

The DPDT Switch (2) enables the user to choose to which LED circuit board (5, 6) the DC supply is to be given. There are at least two LED Boards (5, 6). When the User switches the DC supply to a first LED Board (5), then all the LEDs on that particular LED board will get illuminated.

In at least an embodiment of the pluggable auxiliary driver design, a switch (2) receives constant DC current flow from the pluggable auxiliary driver (4); the switch (2) decides switching between the first output light / LED board (5) and the second output light / LED board (6) ) in case any single board fails. Each board is coupled with a light / LED which is driven by power. This switching between the first output board (5) and the second output board (6) is decided depending on which output board is functional; preference is provided to the first output board (5) – in case, any of the components of the first output board (5) fails, a second output board (6) is activated by switching provisioned by the DPDT switch (2) which shifts the supply from the first output board (5) to the second output board (6).

In at least an embodiment, the system, of this invention, comprises a Smart, durable, Dual Core technology LED Bulb / Tube with Switch for Driver and light / LED.

In at least this embodiment, there is provided a switch for a driver and another switch for light / LED. In case, when either of main (primary) driver / LED board fails, the system can be switched to an auxiliary (secondary) driver / LED with switch.
This enables following switching combinations;
1. Primary Driver + Primary LED (Default);
2. Secondary Driver + Primary LED (when Primary Driver fails, rest all working);
3. Primary Driver + Secondary LED (when Primary LED fails, rest all working);
4. Secondary Driver + Secondary LED (when Primary Driver & LED fail).

In at least this embodiment, there is provided a SINGLE switch for a driver and light / LED. In case, when either of main (primary) driver / LED board fails, the system can be switched to the secondary set / combination of auxiliary (secondary) driver and auxiliary (secondary) LED with this SINGLE switch

In at least an embodiment, the system, of this invention, makes use of auxiliary driver and / or auxiliary LED circuit, either or both, depending upon the vulnerability of the primary driver and primary LED circuit for failure, to back it up in case of primary driver / LED failure and enhance life / longevity of the LED light.

According to a first non-limiting exemplary embodiment, applications where there is excessive power fluctuation and ambient temp is under control (air-conditioned), the system will have auxiliary Driver (embedded/pluggable) to back up primary Driver failure but there will be only primary LED board and no auxiliary LED board.

According to a first non-limiting exemplary embodiment, applications where the ambient temp is very high that can deteriorate LED life and there is no power fluctuation, the system will have auxiliary LED board to back up primary LED board failure but there will be only primary Driver board and no auxiliary Driver board.

In at least an embodiment, the system, of this invention, comprises a Smart, durable, Dual Core technology LED Bulb / Tube with Dual Color.

In at least this embodiment, there is provided a switch to provide dual colour light / LED. E.g. the main (primary) driver and first light / first LED is designed to give say, WHITE colour light and the secondary (auxiliary) driver and second light / second LED is designed to give say, YELLOW colour light. So, when switch is on option 1, it will give WHITE colour light of designed wattage, and when switch is on option 2, it will give YELLOW colour light with same wattage.

In at least an embodiment, the system, of this invention, comprises a Smart, durable, Dual Core technology LED Bulb / Tube with DUAL Wattage.

In at least this embodiment, there is provided a switching option available on the light / LED / bulb / tube for a consumer to use it at single wattage or double wattage. E.g. if the light / LED is designed to be 9W, then the consumer can use it at 9W (single wattage) wherein one of the main (primary) driver / auxiliary (secondary) driver, along with one of (primary / auxiliary) LED, is put-on or the consumer can switch to 18W (double wattage), in which case the main (primary) driver and the auxiliary (secondary) driver, along with the (primary and auxiliary) light / LED is put-on.

In at least an embodiment, the system, of this invention, comprises a Smart, durable, Dual Core technology LED Bulb / Tube with Auto Switching.

In at least this embodiment, in case of the main (primary) driver or LED board failure, the system will automatically switch from main (primary) driver to auxiliary (secondary) driver or LED respectively.

In at least an embodiment, the system, of this invention, comprises a Smart, durable, Dual Core technology LED Bulb / Tube with Replaceable Driver.

In at least this embodiment, there is provided a faulty driver board (encapsulated in a first small enclosure) can be removed / unplugged, manually, and a new driver board (encapsulated in a second small enclosure) can be plugged-in / inserted/ replaced, just like one replaces a choke in a fluorescent tube light.
There are various types of LED as follows, but not limited to;
• Through-hole LEDs
• SMD LEDs
• Bi-color LEDs
• RGB LED
• High – Power LEDs
• Micro LEDs

Standard LED lightings are used for various purposes / applications/ enclosures. They come in various sizes, shapes, wattages, color. Some of the examples, but not limited to, where LED lights used are:
• Indoor ambience lighting for residential / commercial purpose
• Outdoor lighting for residential / commercial purpose
• Outdoor/Indoor Signage’s/ Sign Board / Advertisement Boards
• Mini-LED base application such as, but not limited to, Backlighting Micro-LEDs base lighting
• Decorative lighting
• Fall Ceiling lighting
• Street lighting
• Traffic signal lighting
• Parking area lighting
• Head-lamp/Tail-lamp/Side-indicator signaling in vehicle/car
• Automobile lighting
• Locomotive lighting
• Underwater lighting
• Aviation lighting

The present invention is able to design and cater to all above purposes / applications / enclosures, but not limited to, and across all sizes, shapes, wattages, colour, and any combination of them.

The TECHNICAL ADVANCEMENT, of this invention, lies in providing a light / LED with at least double the life span of prior art lights / LEDs with only a slight increment in cost of components. In the event of failure of the main (primary) driver component s/ LED chip failure, the light / LED is switched, manually /automatically, to the auxiliary (secondary) driver / segment / LED chip circuit and the light / LED can work as a new one again.

With the use of this invention, efforts and costs associated with removal of faulty and re-installation of new lights / LEDs is saved. Particularly, in cases, of application, such as street lightings / decorative lightings / false ceiling lightings / traffic signals, the efforts and costs of packing, un-packing, transportation, logistic, and re-installation are multifold of actual cost of light / LED light. This results in saving of e-wastage, substantially.

The design, of this system, is such that it provides enhanced protection driver design, limits damage occurring due to unavoidable power fluctuations, and isolates the rest of components.

While this detailed description has disclosed certain specific embodiments for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

Dated this 19th day of September, 2022

CHIRAG TANNA
of INK IDEE
APPLICANT’s PATENT AGENT
REGN. NO. IN/PA – 1785

,CLAIMS:WE CLAIM,

1. A smart, durable, illuminating system with a dual-core comprising:
- a series-parallel module, comprising one or more circuit boards, for illuminating one or more illuminating bodies, each circuit board corresponding to a single illuminating body;
- a driver base module which drives said illuminating bodies by a DC supply, said driver base module comprising a dual core with a first core and a second core, in that:
o said first core comprising a main (primary) circuit (3, 5, 7) being a first driver module; and
o said second core comprising an auxiliary (secondary) circuit (4, 6, 8) being a second driver module;
- a first DPDT Switch (2) configured to enable a user to choose which of said cores, selectable from said first core and said second core, to select,
o said first core being a first driver comprising a first rectifier (3) and a first constant current driver IC (5);
o said second core being a second driver comprising a second rectifier (4) and a second constant current driver IC (6); and
- a second DPDT Switch (9) configured to enable a user to choose, to which of said circuit boards, selectable from one or more illuminating body circuit boards (10, 11), to select, in order for DC supply to be given to one of said selected board (10, 11).

2. The system as claimed in claim 1 wherein, said one or more illuminating body circuit boards (10, 11) comprising:
- a first output board (10) connected to a plurality of illuminating bodies such that when supply is provided by said second switch (9) to said first board, each of said plurality of illuminating bodies are illuminated; and
- a second output board (11) connected to said plurality of illuminating bodies such that when supply is provided by said second switch (9) to said second board, each of said plurality of illuminating bodies are illuminated.

3. The system as claimed in claim 1 wherein, said series-parallel module being a circuit board for illuminating said illuminating bodies.

4. The system as claimed in claim 1 wherein, said driver base module being a circuit board for a driver assembly.

5. The system as claimed in claim 1 wherein,
- said first core being a main (primary) circuit (3, 5, 7) comprising a first rectifier (3), a first constant current driver IC (5), and first choke (7), in that,
o said first core being coupled to a first bridge rectifier (3) for switching AC voltage to DC voltage;
o said DC voltage being given to a coupled the first constant current driver IC (5) which is used for giving constant current flow to further parts of said system; and
o said first choke (7) being a driver transformer configured to maintain power factor to obtain DC constant current to be given to said DPDT Switch (9).

6. The system as claimed in claim 1 wherein, second core being a auxiliary (secondary) circuit (4, 6, 8) comprising a second rectifier (4), a second constant current driver IC (6), and a second choke (8).

7. The system as claimed in claim 1 wherein, said system comprising a Chip-on-Board (COB) base consisting of a circuit board for a driver assembly and for a coupled corresponding illuminating body, in that,
- said first DPDT switch (2) configured for switching between main (primary) driver (3, 5) and auxiliary (secondary) driver (4, 6) – in case any single driver fails; and
- said second DPDT switch (9) configured for switching between a first output board (10) and a second output board (11) – in case any single board fails.

8. The system as claimed in claim 1 wherein, said system comprising an Application-Specific Integrated Circuit (ASIC) Base, said ASIC base comprising a single board, a single IC solution, for a driver assembly and for a coupled corresponding illuminating body, said ASIC base comprising at least two pins on an ASIC driver at its input supply side, in that,
- selection of a first pin leads to selection of first DPDT switch (2), said first DPDT switch (2) configured for switching between main (primary) driver (3, 5) and auxiliary (secondary) driver (4, 6) – in case any single driver fails; and
- selection of a second pin leads to selection of second DPDT switch (2), said second DPDT switch (9) configured for switching between a first output board (10) and a second output board (11) – in case any single board fails.