Double-path direct-current high-voltage interlocking and grid-connected circuit

Abstract

The utility model relates to the technical field of electronic power, in particular to a double-path direct-current high-voltage interlocking and grid-connected circuit, which comprises a main loop module, a switch control module and a plurality of indicator lamp modules, the main loop module comprises a plurality of relay main contact switches and is used for performing interlocking single-path output or grid-connected output on input direct-current high voltage; the switch control module comprises a plurality of relay coils corresponding to the relay main contact switches and is used for controlling the on or off of the relay main contact switches; the indicating lamp module is used for indicating the input and output state of the direct-current high voltage. According to the utility model, through the relay main contact switch and the switch control module, interlocking single-path output or grid-connected output of two paths of direct-current high voltage is realized, and the input and output states of the direct-current high voltage are indicated through the indicating lamp module, so that safe and stable operation of the circuit is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic power, in particular to a dual-path DC high-voltage interlocking and grid-connected circuit. Background Art

[0002] With the rapid development of new energy technologies, DC high voltage technology has been widely used in electric vehicles, photovoltaic power generation, energy storage systems and other fields. In DC high voltage systems, in order to ensure the safe and stable operation of the system, it is usually necessary to interlock the input DC high voltage or connect it to the grid. Interlock control can ensure that when multiple DC high voltage sources exist at the same time, the system can select one or more outputs according to predetermined rules to avoid safety problems caused by the simultaneous output of multiple high voltage sources. Grid-connected output can achieve parallel connection of multiple DC high voltage sources, thereby improving the output power and reliability of the system.

[0003] Therefore, it is particularly important to develop a dual-channel DC high voltage interlocking and grid-connected circuit with simple structure and flexible control. This circuit can realize the interlocking single-channel output or grid-connected output of two DC high voltages, and can also indicate the input status of each DC high voltage and the output status after circuit processing. Utility Model Content

[0004] The utility model aims to realize the interlocking single-channel output or grid-connected output of two-channel DC high voltage, and provides a two-channel DC high voltage interlocking and grid-connected circuit.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A dual-channel DC high-voltage interlocking and grid-connected circuit includes a load and two DC high voltages, and also includes a main circuit module, a switch control module, and a plurality of indicator light modules;

[0007] The main circuit module includes a plurality of relay main contact switches, which are used to interlock the input DC high voltage for single-channel output or grid-connected output;

[0008] The switch control module includes a plurality of relay coils corresponding to the relay main contact switches, and is used to control the closing or opening of the relay main contact switches;

[0009] The indicator light module is connected between the positive and negative poles of each input DC high voltage to indicate the input status of each DC high voltage; the indicator light module is connected between the positive output terminal and the negative output terminal of the output DC high voltage to indicate the output status of the DC high voltage after the dual-channel DC high voltage interlocking and grid-connected circuit.

[0010] As a preferred embodiment of the present utility model, the relay main contact switch includes a first positive main contact switch, a second positive main contact switch, a first negative main contact switch and a second negative main contact switch; one end of the first positive main contact switch and one end of the second positive main contact switch are respectively connected to the positive input ends of two DC high voltages, and the other ends are connected to serve as the positive output ends of the DC high voltage; one end of the first negative main contact switch and one end of the second negative main contact switch are respectively connected to the negative input ends of the DC high voltage, and the other ends are connected to serve as the negative output ends of the DC high voltage.

[0011] As a preferred embodiment of the present utility model, the switch control module includes a first switch control circuit and a second switch control circuit; the first switch control circuit is used to control the switching state of the first positive main contact switch and the first negative main contact switch; the second switch control circuit is used to control the switching state of the second positive main contact switch and the second negative main contact switch.

[0012] As a preferred solution of the utility model, the first switch control circuit includes a first auxiliary power supply, a first capacitor, a first diode, a first resistor, a first field effect transistor, a second resistor, a first relay coil, a second relay coil, a third relay coil, and a first interlock switch;

[0013] One end of a parallel branch formed by connecting the first capacitor, the first diode, and the first resistor in parallel is respectively connected to the positive electrode of the first auxiliary power supply and the source of the first field effect transistor, and the other end is connected to the gate of the first field effect transistor, and then connected to the first interlock switch through the second resistor; one end of a parallel branch formed by connecting the first relay coil, the second relay coil, and the third relay coil in parallel is connected to the drain of the first field effect transistor, and the other end is connected to the negative electrode of the first auxiliary power supply.

[0014] As a preferred solution of the utility model, the second switch control circuit includes a second auxiliary power supply, a second capacitor, a second diode, a third resistor, a second field effect transistor, a fourth resistor, a fourth relay coil, a fifth relay coil, a sixth relay coil, and a second interlock switch;

[0015] One end of a parallel branch formed by connecting the second capacitor, the second diode, and the third resistor in parallel is respectively connected to the positive electrode of the second auxiliary power supply and the source of the second field effect transistor, and the other end is connected to the gate of the second field effect transistor, and then connected to the second interlock switch through the fourth resistor; one end of a parallel branch formed by connecting the fourth relay coil, the fifth relay coil, and the sixth relay coil in parallel is connected to the drain of the second field effect transistor, and the other end is connected to the negative electrode of the second auxiliary power supply.

[0016] As a preferred solution of the utility model, the first interlock switch and the second interlock switch are both double-pole double-throw switches;

[0017] The two input ends of the first interlock switch are connected to the negative electrode of the first auxiliary power supply, and the first output end and the third output end of the first interlock switch are both disconnected; the second output end and the fourth output end of the first interlock switch are both connected to one end of the second resistor;

[0018] The two input ends of the second interlock switch are connected to the negative pole of the second auxiliary power supply, and the first output end and the third output end of the second interlock switch are both disconnected; the second output end and the fourth output end of the second interlock switch are both connected to one end of the fourth resistor.

[0019] As a preferred embodiment of the present utility model, the first switch control circuit and the second switch control circuit further include a first switching switch and a second switching switch, respectively; one end of the first switching switch is connected between the two input ends of the first interlock switch, and the other end is connected to one end of the second resistor; one end of the second switching switch is connected between the two input ends of the second interlock switch, and the other end is connected to one end of the fourth resistor; the first switching switch and the second switching switch are respectively used to control the switching of the interlocking mode and the grid-connected mode of the first switch control circuit and the second switch control circuit.

[0020] As a preferred solution of the utility model, each of the indicator light modules has the same structure, including a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor and a light emitting diode;

[0021] One end of the series branch formed by the fifth resistor and the sixth resistor being connected in series is connected to the positive pole of the input voltage of the indicator light module, and the other end is connected to the positive pole of the light-emitting diode; one end of the seventh resistor is connected between the fifth resistor and the sixth resistor, and the other end is connected to the negative pole of the light-emitting diode; one end of the eighth resistor is connected to the positive pole of the input voltage of the indicator light module, and the other end is connected to one end of a parallel branch formed by the ninth resistor and the third capacitor being connected in parallel, and the other end of the parallel branch is connected to the negative pole of the input voltage of the indicator light module; the negative pole of the light-emitting diode is connected to the negative pole of the input voltage of the indicator light module.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0023] The utility model provides a dual-channel DC high voltage interlocking and grid-connected circuit, which realizes the interlocking single-channel output or grid-connected output of the two-channel DC high voltage through a relay main contact switch and a switch control module, and indicates the input and output status of the DC high voltage through an indicator light module to ensure the safe and stable operation of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of a dual-path DC high-voltage interlocking and grid-connected circuit according to Embodiment 1 of the present utility model;

[0025] Figure 2 This is a structural diagram of the main circuit module of Embodiment 1 of the present utility model;

[0026] Figure 3 This is a structural diagram of a first switch control circuit of Embodiment 1 of the present utility model;

[0027] Figure 4 is a structural diagram of a second switch control circuit of Embodiment 1 of the present utility model;

[0028] Figure 5 It is a structural diagram of three indicator light modules of Example 1 of the utility model. DETAILED DESCRIPTION

[0029] The utility model is described in detail below in conjunction with the accompanying drawings.

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] Example 1

[0032] like Figure 1 As shown, it is a structural diagram of a dual-channel DC high-voltage interlocking and grid-connected circuit of this embodiment, which accepts input of two channels (called A channel and B channel in this embodiment) of DC high voltage, and the circuit includes a main circuit module, a switch control module, and a plurality of indicator light modules;

[0033] The main circuit module includes a plurality of relay main contact switches, which are used to interlock the input DC high voltage for single-channel output or grid-connected output;

[0034] The switch control module includes a plurality of relay coils corresponding to the relay main contact switches, and is used to control the closing or opening of the relay main contact switches;

[0035] The indicator light module is connected between the positive and negative poles of each input DC high voltage to indicate the input status of each DC high voltage; the indicator light module is connected between the positive output terminal and the negative output terminal of the output DC high voltage to indicate the output status of the DC high voltage after the dual-channel DC high voltage interlocking and grid-connected circuit.

[0036] like Figure 2As shown, it is a structural diagram of the main circuit module of Example 1 of the utility model, the relay main contact switch includes a first positive main contact switch KB1A, a second positive main contact switch KA1A, a first negative main contact switch KB2A and a second negative main contact switch KA2A; one end of the first positive main contact switch KB1A and one end of the second positive main contact switch KA1A are respectively connected to the positive input ends of two DC high voltages, and the other ends are connected to serve as the positive output ends of the DC high voltage; one end of the first negative main contact switch KB2A and one end of the second negative main contact switch KA2A are respectively connected to the negative input ends of the DC high voltage, and the other ends are connected to serve as the negative output ends of the DC high voltage.

[0037] The switch control module includes a first switch control circuit and a second switch control circuit; the first switch control circuit is used to control the switch state of the first positive main contact switch KB1A and the first negative main contact switch KB2A; the second switch control circuit is used to control the switch state of the second positive main contact switch KA1A and the second negative main contact switch KA2A.

[0038] like Figure 3 As shown, it is a structural diagram of the first switch control circuit of Example 1 of the utility model, wherein the first switch control circuit includes a first auxiliary power supply, a first capacitor C8, a first diode ZD5, a first resistor R39, a first field effect transistor Q2, a second resistor R40, a first relay coil KA3B, a second relay coil KB2B, a third relay coil KB1B, and a first interlock switch KB3A;

[0039] One end of a parallel branch formed by connecting the first capacitor C8, the first diode ZD5, and the first resistor R39 in parallel is respectively connected to the positive electrode of the first auxiliary power supply and the source of the first field effect transistor Q2, and the other end is connected to the gate of the first field effect transistor, and then connected to the first interlock switch KB3A through the second resistor R40; one end of a parallel branch formed by connecting the first relay coil KA3B, the second relay coil KB2B, and the third relay coil KB1B in parallel is connected to the drain of the first field effect transistor Q2, and the other end is connected to the negative electrode of the first auxiliary power supply.

[0040] like Figure 4 As shown, it is a structural diagram of the second switch control circuit of Example 1 of the utility model, wherein the second switch control circuit includes a second auxiliary power supply, a second capacitor C7, a second diode ZD4, a third resistor R37, a second field effect transistor Q1, a fourth resistor R38, a fourth relay coil KB3B, a fifth relay coil KA2B, a sixth relay coil KA1B, and a second interlock switch KA3A;

[0041] One end of a parallel branch formed by connecting the second capacitor C7, the second diode ZD4, and the third resistor R37 in parallel is respectively connected to the positive electrode of the second auxiliary power supply and the source of the second field effect transistor Q1, and the other end is connected to the gate of the second field effect transistor Q1, and then connected to the second interlock switch KA3A through the fourth resistor R38; one end of a parallel branch formed by connecting the fourth relay coil KB3B, the fifth relay coil KA2B, and the sixth relay coil KA1B in parallel is connected to the drain of the second field effect transistor Q1, and the other end is connected to the negative electrode of the second auxiliary power supply.

[0042] The first interlock switch KB3A and the second interlock switch KA3A are both double-pole double-throw switches, which are controlled by the first relay coil KA3B and the fourth relay coil KB3B respectively;

[0043] The two input ends of the first interlock switch KB3A are connected to the negative electrode of the first auxiliary power supply, and the first output end and the third output end of the first interlock switch KB3A are both disconnected; the second output end and the fourth output end of the first interlock switch KB3A are both connected to one end of the second resistor R40;

[0044] The two input ends of the second interlocking switch KA3A are connected to the negative pole of the second auxiliary power supply, and the first output end and the third output end of the second interlocking switch KA3A are both disconnected; the second output end and the fourth output end of the second interlocking switch KA3A are both connected to one end of the fourth resistor R38.

[0045] The first auxiliary power supply and the second auxiliary power supply both adopt 48V DC power supply, wherein the positive voltage of the auxiliary power supply is +24V and the negative voltage is -24V.

[0046] The first switch control circuit and the second switch control circuit also include a first switching switch K1 and a second switching switch K2, respectively; one end of the first switching switch K1 is connected between the two input ends of the first interlocking switch KB3A, and the other end is connected to one end of the second resistor R40; one end of the second switching switch K2 is connected between the two input ends of the second interlocking switch KA3A, and the other end is connected to one end of the fourth resistor R38; the first switching switch K1 and the second switching switch K2 are respectively used to control the switching of the interlocking mode and the grid-connected mode of the first switch control circuit and the second switch control circuit.

[0047] like Figure 5As shown, it is a structural diagram of three indicator light modules, and the three indicator light modules are respectively connected between the positive and negative poles of the DC high voltage of the A path, between the positive and negative poles of the DC high voltage of the B path, and between the positive output terminal and the negative output terminal of the output DC high voltage; each of the indicator light modules has the same structure, and the two DC high voltages are divided into the A path and the B path. Taking the indicator light module between the positive and negative poles of the DC high voltage of the A path as an example, it includes a fifth resistor R1, a sixth resistor R7, a seventh resistor R8, an eighth resistor R25, a ninth resistor R28, a third capacitor C2 and a light-emitting diode LED1;

[0048] One end of the series branch formed by the fifth resistor R1 and the sixth resistor R7 connected in series is connected to the positive pole of the input voltage of the indicator light module, and the other end is connected to the positive pole of the light emitting diode LED1; one end of the seventh resistor R8 is connected between the fifth resistor R1 and the sixth resistor R7, and the other end is connected to the negative pole of the light emitting diode LED1; one end of the eighth resistor R25 is connected to the positive pole of the input voltage of the indicator light module, and the other end is connected to one end of the parallel branch formed by the ninth resistor R28 and the third capacitor C2 in parallel, and the other end of the parallel branch is connected to the negative pole of the input voltage of the indicator light module; the negative pole of the light emitting diode is connected to the negative pole of the input voltage of the indicator light module. When the indicator light module is connected to the DC high voltage, the voltage is divided by the fifth resistor R1 and the seventh resistor R8, and the sixth resistor R7 is current limited to provide voltage for the light emitting diode LED1, and the eighth resistor R25, the ninth resistor R28, and the third capacitor C2 form a voltage detection circuit to provide a detection voltage.

[0049] The following is an explanation of the working principle of a dual-path DC high-voltage interlocking and grid-connected circuit based on the present embodiment:

[0050] When the two input DC high voltages are interlocked for single output (assuming that the output is DC high voltage A), the first switch K1 and the second switch K2 in the first switch control circuit and the second switch control loop are both disconnected; the first switch control circuit is connected to the first auxiliary power supply, and the first interlock switch KB3A is placed in the on state (the double-pole double-throw switch KB3A is placed at the second output terminal and the fourth output terminal), and the voltage of the auxiliary power supply is divided by the second resistor R40 and the first resistor R39, and filtered by the capacitor C8. When the auxiliary power supply voltage reaches the field effect transistor V GSWhen the value is set, the field effect tube Q2 is turned on, and the function of the voltage regulator diode ZD5 is to prevent the auxiliary power supply voltage from exceeding the VGS voltage limit value of the field effect tube Q2. At this time, the auxiliary power supply voltage provides the working voltage for the first relay coil KA3B, the second relay coil KB2B, and the third relay coil KB1B. After the second relay coil KB2B and the third relay coil KB1B are energized and work, the first positive main contact switch KB1A and the first negative main contact switch KB2A of the main circuit module are changed from the normally open state to the closed state, and the DC high voltage of circuit A is output through the first positive main contact switch KB1A and the first negative main contact switch KB2A. The indicator light module corresponding to the DC high voltage and the indicator light module at the output end work, and the light-emitting diodes LED1 and LED3 light up; at the same time, after the first relay coil KA3B is energized and works, the second interlock switch KA3A of the second switch control circuit is converted from a normally closed state to a normally open state (the double-pole double-throw switch KA3A is placed at the first output end and the third output end), so that the fourth relay coil KB3B, the fifth relay coil KA2B, and the sixth relay coil KA1B of the second switch control circuit have no working voltage, the second positive main contact switch KA1A and the second negative main contact switch KA2A remain in the normally open state, and the DC high voltage of channel B is not output.

[0051] When the two input DC high voltages are connected to the grid, the first switch K1 and the second switch K2 in the first switch control circuit and the second switch control loop are closed; the first switch control circuit is connected to the first auxiliary power supply. Since the first switch K1 is in a closed state, the voltage of the auxiliary power supply is divided by the second resistor R40 and the first resistor R39, and filtered by the capacitor C8. When the auxiliary power supply voltage reaches the field effect transistor V GSWhen the value is set, the field effect tube Q2 is turned on, and the function of the voltage regulator diode ZD5 is to prevent the auxiliary power supply voltage from exceeding the VGS voltage limit value of the field effect tube Q2. At this time, the auxiliary power supply voltage provides the working voltage for the first relay coil KA3B, the second relay coil KB2B, and the third relay coil KB1B. After the second relay coil KB2B and the third relay coil KB1B are energized, the first positive main contact switch KB1A and the first negative main contact switch KB2A of the main circuit module are changed from the normally open state to the closed state, and the DC high voltage of circuit A is output through the first positive main contact switch KB1A and the first negative main contact switch KB2A. At the same time, after the first relay coil KA3B is energized, the second switch controls the second interlock switch KA3A of the circuit It is converted from a normally closed state to a normally open state, but because the second switching switch K2 is in a closed state, the second auxiliary power supply can still provide working voltage for the fourth relay coil KB3B, the fifth relay coil KA2B, and the sixth relay coil KA1B, so that the second positive main contact switch KA1A and the second negative main contact switch KA2A in the main circuit module are converted from a normally open state to a normally closed state, and the DC high voltage of path B is output through the second positive main contact switch KA1A and the second negative main contact switch KA2A. At this time, the indicator light module corresponding to the DC high voltage of path A, the indicator light module corresponding to the DC high voltage of path B and the indicator light module at the output end work, and the light-emitting diodes LED1, LED2 and LED3 are lit, so as to achieve the purpose of grid-connected output of two DC high voltages.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual-channel DC high-voltage interlocking and grid-connected circuit, comprising a load and two DC high voltages, characterized in that: It also includes a main circuit module, a switch control module, and several indicator light modules; The main circuit module includes a plurality of relay main contact switches, which are used to interlock the input DC high voltage for single-channel output or grid-connected output; The switch control module includes a plurality of relay coils corresponding to the relay main contact switches, and is used to control the closing or opening of the relay main contact switches; The indicator light module is connected between the positive and negative poles of each input DC high voltage to indicate the input status of each DC high voltage; the indicator light module is connected between the positive output terminal and the negative output terminal of the output DC high voltage to indicate the output status of the DC high voltage after the dual-channel DC high voltage interlocking and grid-connected circuit.

2. A dual-circuit DC high-voltage interlocking and grid-connected circuit as claimed in claim 1, characterized in that: The relay main contact switch includes a first positive main contact switch, a second positive main contact switch, a first negative main contact switch and a second negative main contact switch; one end of the first positive main contact switch and one end of the second positive main contact switch are respectively connected to the positive input ends of two DC high voltages, and the other ends are connected to serve as the positive output ends of the DC high voltage; one end of the first negative main contact switch and one end of the second negative main contact switch are respectively connected to the negative input ends of the DC high voltage, and the other ends are connected to serve as the negative output ends of the DC high voltage.

3. A dual-path DC high-voltage interlocking and grid-connected circuit as claimed in claim 2, characterized in that: The switch control module includes a first switch control circuit and a second switch control circuit; the first switch control circuit is used to control the switching state of the first positive main contact switch and the first negative main contact switch; the second switch control circuit is used to control the switching state of the second positive main contact switch and the second negative main contact switch.

4. A dual-path DC high-voltage interlocking and grid-connected circuit as claimed in claim 3, characterized in that: The first switch control circuit includes a first auxiliary power supply, a first capacitor, a first diode, a first resistor, a first field effect transistor, a second resistor, a first relay coil, a second relay coil, a third relay coil, and a first interlock switch; One end of a parallel branch formed by connecting the first capacitor, the first diode, and the first resistor in parallel is respectively connected to the positive electrode of the first auxiliary power supply and the source of the first field effect transistor, and the other end is connected to the gate of the first field effect transistor, and then connected to the first interlock switch through the second resistor; one end of a parallel branch formed by connecting the first relay coil, the second relay coil, and the third relay coil in parallel is connected to the drain of the first field effect transistor, and the other end is connected to the negative electrode of the first auxiliary power supply.

5. A dual-path DC high-voltage interlocking and grid-connected circuit as claimed in claim 4, characterized in that: The second switch control circuit includes a second auxiliary power supply, a second capacitor, a second diode, a third resistor, a second field effect transistor, a fourth resistor, a fourth relay coil, a fifth relay coil, a sixth relay coil, and a second interlock switch; One end of a parallel branch formed by connecting the second capacitor, the second diode, and the third resistor in parallel is respectively connected to the positive electrode of the second auxiliary power supply and the source of the second field effect transistor, and the other end is connected to the gate of the second field effect transistor, and then connected to the second interlock switch through the fourth resistor; one end of a parallel branch formed by connecting the fourth relay coil, the fifth relay coil, and the sixth relay coil in parallel is connected to the drain of the second field effect transistor, and the other end is connected to the negative electrode of the second auxiliary power supply.

6. A dual-path DC high-voltage interlocking and grid-connected circuit as claimed in claim 5, characterized in that: The first interlock switch and the second interlock switch are both double-pole double-throw switches; The two input ends of the first interlock switch are connected to the negative electrode of the first auxiliary power supply, and the first output end and the third output end of the first interlock switch are both disconnected; the second output end and the fourth output end of the first interlock switch are both connected to one end of the second resistor; The two input ends of the second interlock switch are connected to the negative pole of the second auxiliary power supply, and the first output end and the third output end of the second interlock switch are both disconnected; the second output end and the fourth output end of the second interlock switch are both connected to one end of the fourth resistor.

7. A dual-path DC high-voltage interlocking and grid-connected circuit as claimed in claim 6, characterized in that: The first switch control circuit and the second switch control circuit also include a first switching switch and a second switching switch, respectively; one end of the first switching switch is connected between the two input ends of the first interlock switch, and the other end is connected to one end of the second resistor; one end of the second switching switch is connected between the two input ends of the second interlock switch, and the other end is connected to one end of the fourth resistor; the first switching switch and the second switching switch are respectively used to control the switching of the interlocking mode and the grid-connected mode of the first switch control circuit and the second switch control circuit.

8. A dual-path DC high-voltage interlocking and grid-connected circuit as claimed in claim 1, characterized in that: Each of the indicator light modules has the same structure, including a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor and a light emitting diode; One end of the series branch formed by the fifth resistor and the sixth resistor being connected in series is connected to the positive pole of the input voltage of the indicator light module, and the other end is connected to the positive pole of the light-emitting diode; one end of the seventh resistor is connected between the fifth resistor and the sixth resistor, and the other end is connected to the negative pole of the light-emitting diode; one end of the eighth resistor is connected to the positive pole of the input voltage of the indicator light module, and the other end is connected to one end of a parallel branch formed by the ninth resistor and the third capacitor being connected in parallel, and the other end of the parallel branch is connected to the negative pole of the input voltage of the indicator light module; the negative pole of the light-emitting diode is connected to the negative pole of the input voltage of the indicator light module.

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