KR101550011B1 - The connector band for photovoltaic power system - Google Patents

Abstract

The present invention relates to a photovoltaic power generator improving efficiency by minimizing heating. More particularly, the present invention provides technology capable of saving a current wasted by the heat by minimizing heat and increasing the lifetime of a component which is reduced due to heat. The photovoltaic power generator improving efficiency by minimizing heating according to the embodiment of the present invention includes a plurality of bypass circuits (100), a plurality of bypass switches (110), and a measurement unit (120) which monitors a value state of power flowing in the circuit (200) in a connection board which includes a plurality of solar panels (S1), a plurality of input terminals (S2), a plurality of fuses (S3), a circuit breaker, a plurality of diodes (S4), and an output terminal (S5).

Description

The present invention relates to a photovoltaic power generation system,

The present invention relates to a photovoltaic power generation apparatus with an improved efficiency by minimizing heat generation. Generally, a connection panel for a photovoltaic panel included in a photovoltaic power generation system generates heat by a diode formed therein, And to provide a technique for minimizing heat to save wasted current due to heat and to prolong the service life of parts shortened due to heat.

Generally, the solar cell connecting unit collects the direct current generated from a plurality of solar cell modules included in the solar power generation system and outputs the collected direct current to the inverter included in the solar power generation system.

Such a photovoltaic connection module includes an input terminal, a fuse, a diode, and an output terminal, and the diode functions to shut off a current flowing in a reverse direction.

The diode includes a heat dissipating plate on one side of the diode and a support member for supporting the heat dissipating plate to generate a large amount of heat by performing a function of blocking the current flowing in a reverse direction, And dissipates the heat generated by the diode.

Since the heat sink (extruded aluminum alloy plate) is manufactured in a large capacity so that the heat can be easily generated, the connection half becomes large,

The production cost is inconvenient.

In addition, there is a limit to the heat radiation by the air-cooling type heat dissipation, so that the heat dissipation is performed by attaching the blowing fan. In addition to energy loss caused by the blowing fan,

In view of such a problem, there is provided a technique for radiating heat by using a thermoelectric element on one side of a diode in order to dissipate heat generated from the diode in an amount to reduce the volume.

Generally, thermoelectric elements are formed by bonding two different semiconductors. When a current is applied, endothermic and exothermic effects are generated on both sides of the thermoelectric element by the Peltier effect.

(※ Peltier effect: a phenomenon where heat is generated or absorbed at the contact point when a current is supplied to such a closed circuit by connecting a kind of metal or semiconductor to make a closed circuit)

The thermoelectric element is widely used in a cooling apparatus due to such a property. The thermoelectric element directly or indirectly cools the object to be cooled by utilizing the endothermic action generated from the surface of the thermoelectric element. An aluminum heat sink is installed on the heat- So that the absorbed heat is discharged to the outside. At this time, the heat dissipating plate is exposed to the air and the heat is released by the air cooling method.

Such a thermoelectric device is not realistic in view of the high cost, the lifetime of the thermoelectric device (which can not be used for research), and the electric power required for the thermoelectric device.

The solar light connection including the name inverter of the invention will now be described with reference to FIG. 4. (Attached FIG. 4 is a drawing according to the conventional configuration below)

And an inverter for efficiently cooling the internal space of the solar cell module heated by the heater.

Another aspect of the present invention provides a solar light connecting panel including an inverter for rapidly cooling the internal space of the solar cell connecting unit by simultaneously performing natural ventilation and forced ventilation in the interior space of the solar cell connecting unit heated by the heat generating device It is on.

The photovoltaic panel 10 including the inverter according to the embodiment of the present invention includes a first air inflow portion (not shown) formed in one area of both side portions 110 and 120 of the enclosure case 100 111 and 121 to cool the inner space of the enclosure case 100 heated by the heat generating devices 200 to 800 and cool the inner space of the enclosure case 100 to the first air exhaust port 131 A first forced ventilation passage PASS1 for forcibly discharging the air to the first air discharging portion 131 through an air blowing fan 810 for an inverter provided adjacent to the outer casing 100, Cool air from the outside flows through the air inlet / outlet portions 112 and 122 to cool the internal space of the enclosure case 100 heated by the heat generating devices 200 to 800 and then to the other areas of the side panels 110 and 120 of the enclosure case 100 The natural ventilation ducts 92, which are naturally discharged through the formed air inlet / And the second air inflow portions 113 and 123 formed in another region of both side portions 110 and 120 of the enclosure case 100 to cool the enclosure 100 heated by the heating devices 200 through 800. [ The inner space of the case 100 is cooled and then supplied to the second air discharging portion 141 through the air blowing fan 142 provided adjacent to the second air discharging portion 141 at the front end of the upper surface portion 140 of the enclosure case 100 And a second forced ventilation passage PASS3 for forced discharge.

As described above, in order to cool the inner space of the enclosure case 100 heated by the heat-generating devices 200 to 800 installed therein, the solar-light connecting panel including the inverter has the second air And constitutes a second forced ventilation passage PASS3 for forced discharge to the discharge portion 141. [

The second forced ventilation passage PASS3 is connected to the heat generating device 200 through the second air inflow portions 113 and 123 including the second air inflow portion 113 and the second B air inflow portion 123, And then forcedly discharged to the second air discharge portion 141 through the blowing fan 142 at the front end of the upper surface portion 140 of the enclosure case 100. [

The natural ventilation passage PASS2 is connected to the first air inlet 112 formed in the first side portion 110 of the enclosure case 100 through the first natural air inlet 112A, The second air inlet and outlet 122 formed in the second side portion 120 of the enclosure case 100 after cooling the inner space of the enclosure case 100 heated by the devices 200 to 800, And is naturally discharged through the vent hole 122A.

As can be seen from this configuration, various ventilation facilities are being studied to cool the heat generated by the heating device.

The above-described conventional configuration is a method for cooling the generated heat without solving the root cause of generation of heat, which causes a problem that the size of the connection plate is increased and the cost is increased.

Hereinafter, a description will be given of a known technique which is partially similar to the technical content of the present invention.

The name of the invention, the connection panel for a solar panel, and a part of the control method thereof are as follows (refer to reference numeral 5).

The connection unit 200 receives (or receives) a direct current output from a plurality of the grouped solar cell modules (or one of the grouped solar cell modules) 100. At this time, the connection block 200 includes a plurality of input terminals (or,

The plurality of solar cells are connected to the plurality of solar cells through a plurality of input terminals. The plurality of solar cells are connected to each other through a plurality of input terminals.

Further, the connection unit 200 measures the intermediate voltage (or the intermediate current) received through the plurality of input terminals through the measurement unit included in the connection unit 200.

When the measured intermediate voltage (or the average voltage) is within the predetermined voltage range, the connection block 200 controls the operation of the switching unit so that the voltage or current received through the input terminal Is connected to the output terminal.

That is, when the measured intermediate voltage is within a predetermined voltage range, the connection unit 200 determines that the power generation capacity of the grouped solar cell module 100 is in a normal state, Controls the switching unit so that a voltage or a current received through the input terminal is not directly passed through the diode included in the connection unit 200 but is directly connected to the output terminal.

Further, when the measured intermediate voltage is not present within a predetermined voltage range, the connection block 200 controls the operation of the switching unit so that a voltage or current received through the input terminal is supplied to the diode To the output terminal. That is, when the measured intermediate voltage does not exist within a predetermined voltage range, the grouping of the solar cell module 100 is performed such that the power generation capacity of the grouped solar cell module 100 is less than or equal to a preset power generation capacity, The voltage or current received through the input terminal is judged to be in the no-load state,

And controls the switching unit to be transmitted to the output terminal through the diode.

For example, when the intermediate voltage (for example, 10 V) measured through the measurement unit 270 is out of the predetermined voltage range (for example, 16 V to 26 V) The control unit 210 determines that the power generation capacity of the grouped solar cell module 100 is in an abnormal state, and controls the power supply unit 210 to receive the reverse voltage or the reverse current from the input terminal 210 The switching unit 230 is connected to the diode 240 to transmit a voltage / current to the output terminal 250 through the diode 240.

Here, the conventional problem will be described.

In general, a substrate (not shown) provided with a diode for releasing heat generated in the diode to the outside is in close contact with a heat sink (not shown) for emitting heat generated in the diode.

A silicon bond layer (referred to as a commercially available cone paste) having excellent thermal conductivity is formed between the substrate and the heat generating plate so that the heat generating plate is brought into close contact with the substrate.

The silicone grease is needed to fill the space between the substrate and the heat sink, thereby perfecting the heat conduction.

If the silicon grease mentioned here does not fill the space, the diode temperature may considerably rise, causing a failure of the entire substrate, and may lead to a topic.

When the external temperature of the silicon grease is lowered, it is heated to a temperature of minus 30 ° C, for example, to be heated or cooled by the low temperature. As a result, There is a problem that a space is generated in the heat sink and thereby the heat generated from the diode is emitted to the outside.

In order to solve such a problem, the silicon grease is not shrunk or freezed until the diode has a slight but slight heat.

In the conventional art, power is output to the output terminal 250 through the input terminal 210, the fuse 220, and the switch unit 230, so that no power flows through the diode, In the freezing state.

In the prior art, since power flows in the diode direction only when a reverse current is generated, the diode substrate, the heating plate, and the silicon grease continue to be frozen continuously if no reverse current is generated.

In this case, as described above, a problem occurs in the silicon grease.

In addition, if the temperature deviation is excessive, the heating plate is shrinked and the purity is severe, thereby causing a problem in the connection portion thereof.

For reference, the connection plate for a solar panel is exposed to a low temperature outside in the winter because it is installed in a hearth.

In the case of Siberia, it records about minus 50 ° C in winter.

5, the power output from the input terminal 210 is output to the switch unit 230 through the circuit and the switch unit 230 is connected to the diode 240 and the output terminal 250 To output power.

As a result, the total amount of electric power output from the input terminal 210 goes through the switch portion, so that an arc is generated at the contact portion of the switch portion 230, and the arc is generated as a spark to burn the entire connection portion.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

The purpose of this invention is to bypass the power going to the diode through the bypass circuit while allowing the power to flow continuously in the direction of the diode, have.

When the above object is achieved, silicone grease filling a space between a substrate (not shown) provided with a diode and a heat dissipating plate (not shown) is not cooled in the extreme winter, thereby continuously filling the space.

It is another object of the present invention to prevent an arc from being generated by turning on and off a switch in a state where power output from an input terminal is dispersed by a diode and a bypass switch.

The power dissipated in the diode direction is dispersed by the bypass circuit to minimize the heat generated from the diode, so that the power consumed by the heat can be saved and the lifetime of the component shortened due to heat can be prolonged.

Briefly summarizing the technical structure for achieving the above object,

A fuse for receiving power from the solar panel, a bypass circuit for bypassing the power input from the fuse S3 to the diode S4 and outputting the power to one output terminal S5, (100)

If abnormally low power is generated in any one of the plurality of circuits while power is normally and uniformly distributed, the circuit 200 is measured through the measurement unit 120

When the measured power value is out of the preset voltage range,

The bypass switch 110 connected to the low-power circuit 200 is turned off, the reverse current is cut off by the diode, and when normal power production is monitored through the measurement unit 120 during monitoring, the bypass switch 110 And the power is outputted to the output terminal S5 via the bypass circuit 100. [

The above and other objects are further elucidated in detail.

3, a plurality of solar panels S1, a plurality of input terminals S2, a plurality of fuses S3 and a circuit breaker (hereinafter referred to as a circuit breaker) , A plurality of diodes (S4), and an output terminal (S5) for collecting power output from the plurality of diodes into one,

A plurality of bypass circuits (100) for bypassing the power input from the plurality of fuses (S3) and the plurality of diodes (S4) from the circuit breaker to the output terminal (S5)
The bypass circuit 100 is opened and closed in accordance with a control signal from the controller 130
A plurality of detour switches 110,
A measurement unit 120 for monitoring a state of a power value flowing in the circuit 200; and a controller 120 for determining the state of the circuit 200 by the measurement unit 120 and opening / closing the bypass switch 110
When the power input to the input terminal S2 is simultaneously input to the diode S4 and the plurality of bypass switches 110
And a power supply unit for supplying power to each of the plurality of groups,
The measurement is performed through the measurement unit 120 in one group
When the measured value exceeds the preset voltage range, it is judged that a reverse current flows in the direction of the circuit in which the normally produced power flows abnormally
The bypass switch 110 is turned off and the reverse current is cut off by the diode. When the measured power value through the measuring unit 120 during the monitoring is within the predetermined voltage range, it is determined that the power generation is normal The bypass switch 110 is turned on so that power is output to the output terminal S5 via the bypass circuit 100. [

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And the detour switch is a relay having a mechanical contact.

Wherein the relay is a latching relay

Hereinafter, an embodiment of such a configuration will be described.

As described above, the power generated in the plurality of solar clogs is output to the input terminal, the fuse, the diode, the bypass circuit, and the bypass switch 110 respectively provided in the plurality of circuits 200. Here, Quot; on " state, it is output as the commercial power through the output terminal S5 and the inverter via the bypass circuit 100. [

Referring to the flow chart of FIG. 1,

An input terminal S2 to which a current is inputted from the solar panel S1; A fuse S3 and a breaker (hereinafter referred to as a breaker) through which the current output from the input terminal S2 passes;

The diode S4 to which a current via the fuse S3 and the breaker is input to the diode;

In the connection circuit S7 in which the current output from the diode S4 is output to the inverter S6 via the output terminal S5,

An input part A 'of a relay S8 which cuts off or applies power to an input part A of a diode S4 to which a current outputted from the fuse S3 and the breaker is input is connected, and the relay S8 The output B 'of the relay S8 from which the input current is output is connected to the output B of the diode S4 and the relay S8 is connected to a control device The control device S9 senses the reverse current through the current sensing sensor S10 when the current value generated at the output part B of the diode S4 is reverse current and outputs the reverse current to the relay S8 And a control unit for controlling the control unit.

If the problem is solved as described in the above-mentioned problem, the heat generated from the diode is minimized, so that the current wasted by the heat is saved, and the effect of shortening the diode due to heat and extending the service life of the components around the diode have.

In addition, since the heat sink has a certain heat due to electric power flowing through the diode, the temperature of the heat sink is lowered by the diode even though the temperature of the heat sink is lower than that of the conventional heat sink.

In addition, since the silicon grease filling the space between the substrate and the heat sink maintains the state of expansion at all times, the space is not generated, and when the high heat is generated from the diode, the heat can be smoothly protected.

Further, there is an effect of preventing the generation of an arc by allowing the switch to be turned on and off in a state where the power output from the input terminal is dispersed by the diode and the bypass switch.

In order to cool the heat generated by the diode, conventionally, the heat radiating plate is largely enlarged or a cooling device (thermoelectric device) is provided. In order to release the heat generated by the cooling device to the outside, (Energy waste factor) method which requires a large-capacity blower,

In comparison with the above-described conventional problems, the present invention basically cuts off heat generated in a diode, thereby greatly increasing efficiency.

The above-mentioned effects are further clarified in detail.

FIG. 1 is a flow chart of a photovoltaic power generation apparatus with an improved efficiency by minimizing heat generation according to the present invention;
FIG. 2 is a flow chart of another connecting panel for a solar panel of the present invention; FIG.
FIG. 3 is a flow chart showing an internal configuration of a connection panel of a photovoltaic power generation apparatus in which the heat generation of the present invention is minimized,
FIG. 4 is a side view and a front view showing a solar light connecting panel including a conventional inverter.
5 is a flowchart showing a conventional connection panel control method for a solar panel.

First, the configuration will be initially examined with reference to FIG. 3, and an embodiment will be described.

A plurality of solar panels S1, a plurality of input terminals S2, a plurality of fuses S3 and a circuit breaker (hereinafter referred to as a circuit breaker), a plurality of diodes S4, And an output terminal (S5) for collecting power output from the plurality of diodes into one,

A plurality of bypass circuits (100) for bypassing the power input from the plurality of fuses (S3) and the circuit breakers to the plurality of diodes (S4) and outputting the power to one output terminal (S5)

The plurality of bypass circuits (100) are opened and closed in accordance with a control signal of the controller (130)

A plurality of detour switches 110,

A measurement unit 120 connected to the measurement unit 120 to determine the state of the circuit 200 and to control the opening and closing of the bypass switch 110, Let's

Here, the detour switch 110 refers to a relay S8 that operates under the power of the control unit 130. [

When a plurality of bypass switches 110 for opening and closing the plurality of bypass circuits 100 are turned on

If abnormally low power is generated in any one of the groups in the course of normally generating power equally in each of the plurality of groups, the circuit 200 is measured through the measurement unit 120

When the measured value deviates from the predetermined voltage range, it is judged that a reverse current flows in the circuit direction in which the high power normally produced flows abnormally

The reverse current is cut off by the diode by turning off the bypass switch 110 connected to the low-power circuit 200, and when the measured power value through the measuring unit 120 during monitoring is within a preset voltage range , It is determined that the power generation is normal and the bypass switch 110 is turned on to output power to the output terminal S5 via the bypass circuit 100. [

The measurement unit 120 senses the power output from each solar panel S1 to the circuit 200. [

The following will be described with reference to the flowchart of Fig.

An input terminal S2 to which a current is inputted from the solar panel S1; A fuse S3 and a breaker (hereinafter referred to as a breaker) through which the current output from the input terminal S2 passes;

The diode S4 to which a current via the fuse S3 and the breaker is input to the diode;

In the connection circuit S7 in which the current output from the diode S4 is output to the inverter S6 via the output terminal S5,

Such a technical arrangement is a general conventional connection panel.

The solar panel generates a current by the sunlight and supplies the current to the inverter through the input terminal S2, the fuse S3 and the breaker, the diode S4 and the output terminal S5. S6.

The input terminal S2 can not be connected to a simple electric wire (copper plate or the like) into which a current generated in the solar panel S1 flows, and the fuse S3 and the breaker are connected to the current output line including the solar panel, Which is a safety device that cuts off the current when it occurs, and the diode S4 functions as a check valve function for blocking reverse current.

And the output terminal S5 is a copper wire that is connected to the inverter.

The diode S4 is in contact with a heat radiating plate for discharging heat generated from the diode on one side thereof, thereby discharging the heat of the diode to the outside.

Hereinafter, the technical contents invented by the present invention will be described.

An input part A 'of a relay S8 which cuts off or applies power to an input part A of a diode S4 to which a current outputted from the fuse S3 and the breaker is input is connected, and the relay S8 The output B 'of the relay S8 from which the input current is output is connected to the output B of the diode S4 and the relay S8 is connected to a control device The control device S9 senses the reverse current through the current sensing sensor S10 when the current value generated at the output part B of the diode S4 is reverse current and outputs the reverse current to the relay S8 And a control unit for controlling the control unit.

An embodiment of such a structure will be described below.

As described above, the solar panel S1 produces electricity and outputs it to the connection board S7

 The current is outputted to the inverter through the input terminal S2 provided in the connection half, the fuse S3 and the breaker, and the relay S8 via the output terminal S5.

Here, for example, the connection module S7 is a group of configurations including, for example, one group of solar panels, one input terminal, one breaker, and one diode.

The plurality of groups thus configured are installed in one connection panel (except for the solar panel) and the plurality of groups are connected to one output terminal S5.

So that the currents produced in the plurality of groups are outputted to the inverter through one output terminal S5.

Since a plurality of groups are connected to one output terminal S5 as described above, for example, when one of the three groups can not produce a current, the currents produced in the two groups are converted into a group Reverse current) occurs.

When the reverse current is generated in this manner, the current sensing sensor S10 senses the reverse current data and the control device S9 for calculating the sensed value blocks the current flowing to the relay S8.

When the current flowing through the relay S8 is cut off as described above, the reverse current flows in the direction of the diode S4, so that the diode S4 blocks the reverse current.

Then, when a reverse current is not detected from the current detection sensor S10, the relay S8 is connected and the current is passed through the relay S8.

As described above, in the present invention, only when a problem (reverse current generation) occurs, a current is applied to the diode S4 (a slight amount of power is passed through the diode even though a current is outputted through the relay)

 In comparison with the conventional diode, the diode has a very low probability of generating heat, so that the lifetime is extended, the power consumption is low, the heating plate due to heat dissipation can be miniaturized, the cost is reduced, and the size of the connection panel is reduced, And therefore, it can be said that the merchantability is high.

Finally, a sensor S11 for detecting a current value is connected to the input unit A and the output unit B of the diode S4, respectively, and the current value flowing through the input unit A and the output unit B is calculated If the processed current values are the same, the current is continuously passed through the relay S8. However, if a reverse current is generated for various reasons, the current values of the input unit A and the output unit B are varied.

 The sensor S11 of the control device S9 detects the deviation value and cuts off the current flowing in the relay direction according to the control method. In this way, the reverse current is blocked by the relay and the diode, and can no longer move toward the input terminal.

The current sensing sensor measures the voltage difference between the resistors by connecting a very small resistance in series to the output portion (B) through which the current flows.

For example, if the resistance in the above circuit is 0.01 ohms and the voltage difference V is 0.02V

   According to Ohm's law, I = V / R = 0.02 / 0.01 = 2A flows.

The following is a more detailed description of the relay.

A sensor S11 for detecting a current value is connected to the input section A and the output section B of the diode S4 to calculate a current value flowing through the input section A and the output section B, If the measured power value is less than the set power value and if the measured current value is less than the set power value and if the current value of the input part A and the output part B When the deviation is generated, the sensor S11 interlocked with the control device S9 senses the current and cuts off the current flowing in the relay direction according to the control method. When the set current is sensed, the relay S8 is controlled .

By configuring in this way, for example, if the set power is set to 0.5 watt, if the power sensed by the sensor S11 of the control unit S9 is 0.5 watt or more, the current is continuously passed through the relay S8 ,

However, when the current value is deviated from 0.5 watts or less, that is, when 0.4 watts is detected and when the current value of the input unit A and the output unit B is varied, the sensor S11 of the control unit S9 senses the above value According to the control method, the current flowing in the relay direction is cut off.

Thereafter, when the current detection value is set to 0.5 watts in a state where the current value does not vary between the input unit A and the output unit B, electric power flows in the relay direction again.

The reason for doing this is that if the relay is operated when the set value is higher than the set value, the relay generates an arc due to the high current, shortening the life of the relay or risking the topic. However, in view of this problem, the present invention allows the relay to operate at a low current.

As a result, the inventors of the present invention have found that, by providing such a technology, the inventors of the present invention have found that the high temperature of the connection module, which has not yet been solved, It solves the waste of energy lost at a glance.

This technology is a very desirable invention because it has the effect of contributing to national development.

The following is about monitoring.

The control device S9 is configured to be interlocked with the monitoring device so as to monitor a situation where a reverse voltage is detected in the current sensing sensor S10 (a circuit including the current sensing sensor and the voltage sensor) and a situation in which the relay is operated.

By constructing in this way, it is possible to predict the life of the relay by analyzing the data of the reverse voltage situation and the operation state of the relay, and to collect the preparation for the failure and the maintenance plan in advance.

As described above, if the technical composition of the present invention is utilized, it is economically advantageous to save cost.

S1; Solar panel S2; Input terminal
S3; Fuse S4; diode
S5: output terminal S6; inverter
S7; Connection board S8; relay
S9; Control device S10; Current Sensing Sensor
100; A bypass circuit 110; Bypass switch
120; A measuring unit 130; The control unit
200; Circuit

Claims (3)

A plurality of solar panels S1, a plurality of input terminals S2, a plurality of fuses S3 and a circuit breaker (hereinafter referred to as a circuit breaker), a plurality of diodes S4, And an output terminal (S5) for collecting power output from the plurality of diodes into one,

A plurality of bypass circuits (100) for bypassing the power input from the plurality of fuses (S3) and the plurality of diodes (S4) from the circuit breaker to the output terminal (S5)
The bypass circuit 100 is opened and closed in accordance with a control signal from the controller 130
A plurality of detour switches 110,
A measurement unit 120 for monitoring a state of a power value flowing in the circuit 200; and a controller 120 for determining the state of the circuit 200 by the measurement unit 120 and opening / closing the bypass switch 110
When the power input to the input terminal S2 is simultaneously input to the diode S4 and the plurality of bypass switches 110
And a power supply unit for supplying power to each of the plurality of groups,
The measurement is performed through the measurement unit 120 in one group
When the measured value exceeds the preset voltage range, it is judged that a reverse current flows in the direction of the circuit in which the normally produced power flows abnormally
The bypass switch 110 is turned off and the reverse current is cut off by the diode. When the measured power value through the measuring unit 120 during the monitoring is within the predetermined voltage range, it is determined that the power generation is normal The bypass switch 100 is turned on and the power is output to the output terminal S5 via the bypass circuit 100. The solar power generation apparatus according to claim 1,
The method of claim 1,
Wherein the detour switch (110) is a relay having a mechanical contact, wherein the efficiency is increased by minimizing heat generation.
The method of claim 2,
Wherein the relay is a latching relay, wherein the heat generation is minimized to increase the efficiency.

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