Control circuit and system for indicator lights
Patent Information
- Application Number
- CN202522537833.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-11-28
AI Technical Summary
[0004]本申请实施例提供了一种指示灯的控制电路和系统，以解决现有技术中利用电容或电阻消除指示灯的感应干扰电压导致的器件成本、时间成本和走线成本的问题
[0015]本申请实施例提供一种指示灯的控制电路和系统，该控制电路包括指示灯和电源模块，指示灯的阴极与电源模块的第一电压输出端连接，由于第一电压输出端提供0V电压，第二电压输出端提供正电压，当需要指示灯点亮时，指示灯的阳极与电源模块的第二电压输出端连接，指示灯的阳极接入正电压，阴极接入0V，使得指示灯两端产生额定电压而导通发光；当需要指示灯熄灭时，指示灯的阳极与电源模块的第一电压输出端连接，使得指示灯的阳极和阴极均接入0V电压，两端压差为0V，无论及其运行产生多大感应电压，都无法形成电流，消除指示灯微亮的效果更彻底、更稳定；并且整个电路结构简单，控制简单，无需额外采购电容或电阻等元件，直接减少器件成本，也无需额外进行安规测试，也无需新增器件布局，减少布线工时和成本，显著降低了各种成本。
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Abstract
Description
Technical Field
[0001] This application relates to the field of electronic circuit technology, and in particular to a control circuit and system for an indicator light. Background Technology
[0002] In various electronic devices and industrial control equipment, indicator lights are commonly used status indicators to provide feedback to users on whether the equipment is operating normally. An indicator light can be considered equivalent to a light-emitting diode (LED). When a positive rated voltage is applied across the LED, it conducts and emits light, thus indicating the status. However, in practical applications, when the LED is turned off (theoretically, the LED should be off), electromagnetic induction generated during its operation causes a weak induced voltage at the LED's anode. Although this induced voltage does not reach the LED's rated emission voltage, it is sufficient to generate a weak current that causes the LED to light up slightly, leading users to misjudge the equipment status and affecting the accuracy of the indication.
[0003] In related technologies, to address the issue of LEDs dimly lighting due to induced voltage when off, a capacitor or resistor is typically connected in parallel across the LED indicator. The capacitive reactance of the capacitor or the voltage divider characteristic of the resistor dissipates the weak current generated by the induced voltage, thus suppressing the dim LED indicator. However, this solution requires selecting capacitors or resistors of specific specifications for different devices and necessitates safety testing of these devices, increasing component cost, time cost, and wiring cost. Utility Model Content
[0004] This application provides a control circuit and system for an indicator light to solve the problems of device cost, time cost and wiring cost caused by using capacitors or resistors to eliminate the induced interference voltage of the indicator light in the prior art.
[0005] In a first aspect, embodiments of this application provide a control circuit for an indicator light, including: Indicator lights and power module; The cathode of the indicator light is connected to the first voltage output terminal of the power module; When the indicator light needs to be lit, the anode of the indicator light is connected to the second voltage output terminal of the power module; When the indicator light needs to be turned off, the anode of the indicator light is connected to the first voltage output terminal of the power module; The first voltage output terminal provides 0V, and the second voltage output terminal provides a positive voltage.
[0006] In one possible implementation, the control circuit of the indicator light also includes: a single-pole double-throw relay; The common terminal of the single-pole double-throw relay is connected to the anode of the indicator light, the normally closed terminal is connected to the first voltage output terminal, and the normally open terminal is connected to the second voltage output terminal. When the indicator light needs to be turned on, the common terminal and normally open terminal of the single-pole double-throw relay are closed; When the indicator light needs to be turned off, the common terminal and normally closed terminal of the single-pole double-throw relay are closed.
[0007] In one possible implementation, the number of indicator lights is multiple, and the number of single-pole double-throw relays is the same as the number of indicator lights; Each single-pole double-throw relay controls the lighting or extinguishing of one indicator light.
[0008] In one possible implementation, the indicator lights include a closing indicator light, a running indicator light, and a fault indicator light; The single-pole double-throw relay corresponding to the closing indicator light is the first relay; The single-pole double-throw relay corresponding to the running indicator light is the second relay; The single-pole double-throw relay corresponding to the fault indicator light is the third relay; When the system equipment is closed, the common terminal and normally open terminal of the first relay are closed, so that the closing indicator light is lit. When the system equipment is in normal operation, the common terminal and normally open terminal of the second relay are closed, and the common terminal and normally closed terminal of the third relay are closed, so that the running indicator light is lit and the fault indicator light is off. When a system device malfunctions, the common terminal and normally closed terminal of the second relay close, and the common terminal and normally open terminal of the third relay close, so that the running indicator light goes out and the fault indicator light illuminates.
[0009] In one possible implementation, the positive voltage provided at the second voltage output terminal of the power module is 12V or 24V.
[0010] In one possible implementation, the indicator light is a light-emitting diode (LED).
[0011] Secondly, embodiments of this application provide a control system for an indicator light, the system including a control unit and a control circuit for the indicator light as described in any of the first aspects above; The control unit is located between the anode of the indicator light and the power module; The control unit controls the anode of the indicator light to be connected to the second voltage output terminal of the power module; or, controls the anode of the indicator light to be connected to the first voltage output terminal of the power module.
[0012] In one possible implementation, the control unit is connected to a single-pole double-throw relay in the control circuit; When the indicator light needs to be turned on, the control unit sends a first control signal to the single-pole double-throw relay to control the closure of the common terminal and normally open terminal of the single-pole double-throw relay; When the indicator light needs to be turned off, the control unit sends a second control signal to the single-pole double-throw relay to control the common terminal and normally closed terminal of the single-pole double-throw relay to close.
[0013] In one possible implementation, there are multiple indicator lights, and the number of single-pole double-throw relays is the same as the number of indicator lights; each single-pole double-throw relay controls the lighting or extinguishing of one indicator light.
[0014] In one possible implementation, the indicator lights include a closing indicator light, a running indicator light, and a fault indicator light; The single-pole double-throw relay corresponding to the closing indicator light is the first relay; The single-pole double-throw relay corresponding to the running indicator light is the second relay; The single-pole double-throw relay corresponding to the fault indicator light is the third relay; When the system equipment is closed, the control unit controls the common terminal and normally open terminal of the first relay to close, so that the closing indicator light is lit. When the system equipment is in normal operation, the control unit controls the common terminal and normally open terminal of the second relay to close, so that the running indicator light is lit, and controls the common terminal and normally closed terminal of the third relay to close, so that the fault indicator light is turned off. When a system device malfunctions, the control unit controls the common terminal and normally closed terminal of the second relay to close, so that the running indicator light goes out, and controls the common terminal and normally open terminal of the third relay to close, so that the fault indicator light comes on.
[0015] This application provides a control circuit and system for an indicator light. The control circuit includes an indicator light and a power module. The cathode of the indicator light is connected to the first voltage output terminal of the power module. Since the first voltage output terminal provides 0V and the second voltage output terminal provides a positive voltage, when the indicator light needs to be lit, the anode of the indicator light is connected to the second voltage output terminal of the power module. The anode of the indicator light receives a positive voltage, and the cathode receives 0V, so that the indicator light generates a rated voltage across its terminals and conducts light. When the indicator light needs to be turned off, the anode of the indicator light is connected to the first voltage output terminal of the power module, so that both the anode and cathode of the indicator light receive 0V, and the voltage difference across the terminals is 0V. No matter how much induced voltage is generated during operation, no current can be formed, thus eliminating the dim lighting effect of the indicator light more thoroughly and stably. Furthermore, the entire circuit structure is simple, and the control is simple. There is no need to purchase additional components such as capacitors or resistors, which directly reduces the cost of components. There is also no need for additional safety testing or additional component layout, which reduces wiring time and cost, significantly reducing various costs. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the control circuit for an indicator light provided in the prior art; Figure 2 This is a schematic diagram of the control circuit for an indicator light provided in one embodiment of this application; Figure 3 This is a schematic diagram of the control circuit for an indicator light provided in another embodiment of this application; Figure 4 This is a schematic diagram of the control circuit for an indicator light provided in another embodiment of this application; Figure 5 This is a schematic diagram of the control system for an indicator light provided in one embodiment of this application; Figure 6 This is a schematic diagram of the control system for an indicator light provided in another embodiment of this application. Detailed Implementation
[0017] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.
[0018] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.
[0019] To address the issue of LED indicator lights dimly lighting due to induced voltage when off, thus affecting their accuracy, the most common solution in existing technology is to connect a capacitor or resistor in parallel across the LED indicator. The capacitive reactance of the capacitor or the voltage divider characteristic of the resistor dissipates the weak current generated by the induced voltage. For example,... Figure 1 As shown, a capacitor is connected in parallel across the LED light. When the LED light is switched off, if an induced voltage is generated due to machine operation, the capacitor can absorb it, thus suppressing the LED indicator from dimly lighting. However, this solution has the following drawbacks: 1. Increased component costs: Additional capacitors or resistors are required, and they must be matched to the equipment's operating conditions (such as voltage level, temperature environment, etc.). Specific specifications of components need to be selected for different equipment operating conditions, directly increasing the material cost of the system equipment. 2. Increased safety compliance costs: The newly added capacitors and resistors are electrical components in the circuit and must comply with the safety standards of the equipment's field. Therefore, safety testing of the new components is required, resulting in additional safety testing costs. 3. Increased wiring costs: The new components require wiring connections inside the equipment, increasing the time and material costs of wiring. 4. The addition of new components and wiring will occupy the limited installation space inside the equipment, restricting miniaturization design.
[0020] To address the aforementioned technical deficiencies, this application proposes the following technical concept: One output terminal of the power module outputs a positive voltage, while the other output terminal provides a 0V voltage. The cathode of the indicator light is connected to the 0V voltage terminal in the power supply. When the indicator light needs to be lit, its anode is connected to a positive voltage; when the indicator light does not need to be lit, its anode is also connected to a 0V voltage terminal. Since both the anode and cathode of the indicator light are connected to a 0V voltage terminal, the voltage difference across the indicator light is always 0V, ensuring it remains off. This completely eliminates the influence of induced voltage generated by the operation of the equipment on the indicator light. Furthermore, this design does not add additional resistors or capacitors, saving on component costs, safety compliance costs, and wiring costs, without increasing space requirements, making it more suitable for miniaturized equipment design.
[0021] The implementation of this application will be described in detail below with reference to the specific accompanying drawings: Figure 2 This is a schematic diagram of the control circuit for an indicator light provided in one embodiment of this application.
[0022] like Figure 2As shown, the control circuit provided in this embodiment includes: an indicator light and a power module; the cathode of the indicator light is connected to the first voltage output terminal of the power module; when the indicator light needs to be lit, the anode of the indicator light is connected to the second voltage output terminal of the power module; when the indicator light needs to be turned off, the anode of the indicator light is connected to the first voltage output terminal of the power module; wherein, the first voltage output terminal provides 0V voltage, and the second voltage output terminal provides positive voltage.
[0023] In this embodiment, the cathode of the indicator light is connected to the first voltage output terminal of the power module. Since the first voltage output terminal provides 0V and the second voltage output terminal provides a positive voltage, when the indicator light needs to be lit, the anode of the indicator light is connected to the second voltage output terminal of the power module. Figure 2 As shown in Figure 'a', the anode of the indicator light is connected to a positive voltage, and the cathode is connected to 0V, causing the indicator light to conduct and emit light due to the rated voltage across its terminals. When the indicator light needs to be turned off, its anode is connected to the first voltage output terminal of the power module, as shown in Figure 'a'. Figure 2 As shown in b, both the anode and cathode of the indicator light are connected to 0V, and the voltage difference between the two ends is 0V. No matter how much induced voltage is generated during machine operation, no current can be formed, thus eliminating the "dim light" effect of the indicator light more thoroughly and stably. In addition, the entire circuit structure is simple and easy to control. There is no need to purchase additional components such as capacitors or resistors, which directly reduces the cost of components. There is also no need to conduct additional safety tests or add new component layouts, which reduces wiring time and costs, and significantly reduces various costs.
[0024] Figure 3 This is a schematic diagram of the control circuit for an indicator light provided in another embodiment of this application.
[0025] like Figure 3 As shown, the control circuit of the indicator light also includes: a single-pole double-throw relay; the common terminal (COM) of the single-pole double-throw relay is connected to the anode of the indicator light, the normally closed terminal (NC) is connected to the first voltage output terminal of the power supply module; the normally open terminal (NO) is connected to the second voltage output terminal of the power supply module; when the indicator light needs to be lit, the common terminal and the normally open terminal of the single-pole double-throw relay are closed; when the indicator light needs to be turned off, the common terminal and the normally closed terminal of the single-pole double-throw relay are closed.
[0026] In this embodiment, the core function of the single-pole double-throw relay is to control the switching between the common terminal and the normally closed / normally open terminal by energizing or de-energizing the relay coil. When the system equipment needs to be illuminated by an indicator light, the coil of the single-pole double-throw relay is energized. After the coil is energized, it generates an electromagnetic magnetic field, which attracts the internal contacts of the relay to actuate, causing the common terminal (COM) and the normally open terminal (NO) of the relay to close. At this time, the circuit path is: positive voltage terminal (i.e., the first voltage terminal) → normally open terminal (NO) → common terminal (COM) → indicator light anode → indicator light cathode → 0V voltage terminal (i.e., the second voltage terminal). A positive rated voltage difference is formed across the two ends of the indicator light, and the indicator light is illuminated normally, realizing the status indication. When the system equipment requires the indicator light to be off, the power supply to the single-pole double-throw relay coil is cut off. The coil loses its magnetism, and the internal contacts of the relay are reset under the action of the spring, closing the common terminal (COM) and the normally closed terminal (NC). At this time, the circuit path is: 0V voltage terminal (i.e., the second voltage terminal) → normally closed terminal (NC) → common terminal (COM) → indicator light anode → indicator light cathode → 0V voltage terminal. The anode and cathode of the indicator light are both connected to the 0V voltage terminal through the circuit, and the potential difference between the two ends is 0V. Even if the machine generates an induced voltage, it will not be able to form a weak current because there is no potential difference between the two ends of the indicator light, thus eliminating the dim lighting phenomenon from the root and ensuring that the indicator light is completely extinguished.
[0027] It should be noted that, in this embodiment, the positive voltage provided by the second voltage output terminal of the power module can be 12V or 24V or other voltage values that are compatible with the rated operating voltage of the indicator light.
[0028] In this embodiment, by connecting both ends of the indicator light to 0V when it needs to be lit, the potential difference between the two ends of the indicator light is directly 0V. No matter how large the induced voltage is generated during machine operation, no current can be formed. Compared with the existing capacitor / resistor discharge solution (which may cause untimely discharge due to excessive induced voltage), the effect of eliminating dim lighting is more thorough and stable, avoiding users' misjudgment of the equipment status. Furthermore, there is no need to purchase additional capacitors, resistors, and other components, directly reducing the cost of component procurement. There are no new components, no need for additional safety testing and certification, reducing safety costs. There is no need to wire for new components, reducing wiring time and material costs, while saving internal space and facilitating the miniaturization of the equipment.
[0029] In one possible implementation, there are multiple indicator lights, and the number of single-pole double-throw relays is the same as the number of indicator lights; each single-pole double-throw relay controls the lighting or extinguishing of one indicator light.
[0030] It should be noted that during the actual operation of the system equipment, multiple indicator lights may be needed to indicate different states of the equipment. For each indicator light, a single-pole double-throw relay is used to control its lighting or extinguishing.
[0031] In one possible implementation, such as Figure 4 As shown, there can be three indicator lights: a closing indicator light, a running indicator light, and a fault indicator light. The single-pole double-throw relay corresponding to the closing indicator light is the first relay (S1); the single-pole double-throw relay corresponding to the running indicator light is the second relay (S2); and the single-pole double-throw relay corresponding to the fault indicator light is the third relay (S3). When the system equipment is closed, the common terminal and normally open terminal of the first relay are closed to illuminate the closing indicator light. When the system equipment is in normal operation, the common terminal and normally open terminal of the second relay are closed to illuminate the running indicator light, and the common terminal and normally closed terminal of the third relay are closed to extinguish the fault indicator light. When the system equipment malfunctions, the common terminal and normally closed terminal of the second relay are closed to extinguish the running indicator light, and the common terminal and normally open terminal of the third relay are closed to illuminate the fault indicator light.
[0032] In this embodiment, the closing indicator light indicates whether the system equipment has successfully closed, the running indicator light indicates whether the system equipment is in normal operating condition, and the fault indicator light indicates whether the system equipment has malfunctioned. When the equipment successfully closes, the closing indicator light needs to be illuminated to indicate a successful closing status. Therefore, the common terminal and normally open terminal of the first relay S1 are closed to illuminate the closing indicator light. When the system equipment is in normal operating condition, the running indicator light needs to remain illuminated while the fault indicator light remains off. Therefore, the common terminal and normally open terminal of the second relay S2 are closed to illuminate the running indicator light, and the common terminal and normally closed terminal of the third relay S3 are closed to extinguish the fault indicator light. When the system equipment malfunctions, the fault indicator light needs to be illuminated and the running indicator light needs to be extinguished. Therefore, the common terminal and normally closed terminal of the second relay S2 need to be closed to extinguish the running indicator light, and the common terminal and normally open terminal of the third relay S3 need to be closed to illuminate the fault indicator light.
[0033] It should be noted that in this embodiment, the colors of multiple indicator lights can be different, such as red for the closing indicator light, green for the running indicator light, and yellow for the fault indicator light, so as to more clearly indicate the different states of the equipment.
[0034] In one possible implementation, the indicator light can be a light-emitting diode (LED).
[0035] In this embodiment, an indicator light is turned on or off by a single-pole double-throw relay. The control is achieved solely by switching the contacts of the single-pole double-throw relay, without adding any complex circuits or components. The control logic is simple and easy to understand.
[0036] Figure 5This is a schematic diagram of the control system for an indicator light provided in one embodiment of this application.
[0037] like Figure 5 As shown, the control system provided in this embodiment includes, in addition to, Figure 2 The control circuit for the indicator light also includes a control unit; wherein the control unit is disposed between the anode of the indicator light and the power module, and the control unit controls the anode of the indicator light to be connected to the second voltage output terminal of the power module; or, controls the anode of the indicator light to be connected to the first voltage output terminal of the power module.
[0038] In this embodiment, the connection between the anode of the indicator light and the two output terminals of the power module is controlled by the control unit. The control unit is used to determine which indicator light in the system device needs to be lit and which indicator light needs to be turned off according to the operating status of the system device. When it is determined that the indicator light needs to be lit, the control unit directly controls the connection between the anode of the indicator light and the second output terminal of the power module.
[0039] Figure 6 This is a schematic diagram of the control system for an indicator light provided in another embodiment of this application. This embodiment takes three indicator lights as an example to describe the control system for the indicator lights.
[0040] The control unit is connected to the single-pole double-throw relay in the control circuit. When the indicator light needs to be lit, the control unit sends a first control signal to the single-pole double-throw relay to control the common terminal and normally open terminal of the single-pole double-throw relay to close. When the indicator light needs to be turned off, the control unit sends a second control signal to the single-pole double-throw relay to control the common terminal and normally closed terminal of the single-pole double-throw relay to close.
[0041] In this embodiment, the control signals of the system equipment are output by the control unit. The control unit is used to determine which indicator light in the system equipment needs to be lit and which indicator light needs to be turned off based on the operating status of the system equipment. When it is determined that an indicator light needs to be lit, a first control signal is sent to the single-pole double-throw relay used to control the lighting / turning off of the indicator light. The first control signal is a control signal to energize the relay coil, thereby closing the common terminal and normally open terminal of the relay and lighting the indicator light. When it is determined that an indicator light needs to be turned off, a second control signal is sent to the single-pole double-throw relay used to control the lighting / turning off of the indicator light. The second control signal is a control signal to de-energize the coil, thereby controlling the common terminal and normally closed terminal of the relay to close and turn off the indicator light.
[0042] In one possible implementation, there are multiple indicator lights, and the number of single-pole double-throw relays is the same as the number of indicator lights; each single-pole double-throw relay controls the lighting or extinguishing of one indicator light; the control unit acquires the operating status information of the system equipment in real time, and controls the action of each single-pole double-throw relay according to the operating status information to control the corresponding indicator light to light up or extinguish.
[0043] like Figure 6 As shown, the indicator lights include a closing indicator light, a running indicator light, and a fault indicator light; the single-pole double-throw relay corresponding to the closing indicator light is the first relay (S1); the single-pole double-throw relay corresponding to the running indicator light is the second relay (S2); and the single-pole double-throw relay corresponding to the fault indicator light is the third relay (S3). When the operating status information obtained by the control unit is closing information, the common terminal and normally open terminal of the first relay are closed to illuminate the closing indicator light; when the operating status information obtained by the control unit is normal operating information, the common terminal and normally open terminal of the second relay are closed to illuminate the running indicator light, and the common terminal and normally closed terminal of the third relay are closed to extinguish the fault indicator light; when the operating status information obtained by the control unit is fault information, the common terminal and normally closed terminal of the second relay are closed to extinguish the running indicator light, and the common terminal and normally open terminal of the third relay are closed to illuminate the fault indicator light.
[0044] The control unit and the single-pole double-throw relay are both located on the system control board.
[0045] In this embodiment, the control unit can be a microcontroller unit (MCU) used to acquire various operating status information of the system equipment and generate corresponding control signals based on the operating status information, sending them to the corresponding single-pole double-throw relays to control the corresponding indicator lights to turn on or off. Specifically, when closing information is acquired, a first control signal is sent to the first relay S1, energizing the coil of S1, thereby controlling the common terminal and normally open terminal of S1 to close. When the operating status information is normal operating information, a first control signal is sent to S2, energizing the coil of S2, thereby controlling the common terminal and normally open terminal to close, so that the operating indicator light turns on, and a second control signal is sent to S3, de-energizing the coil of S3, thereby controlling the common terminal and normally closed terminal of S3 to close, so that the fault indicator light is in an off state. When the operating status information is a fault information, a second control signal is sent to S2 to de-energize the coil of S2, thereby controlling the common terminal and normally closed terminal of S2 to close, so that the operating indicator light is turned off. A first control signal is sent to S3 to energize the coil of S3, thereby controlling the common terminal and normally open terminal of S3 to close, so that the fault indicator light is turned on.
[0046] In this embodiment, the control unit automatically controls the energization or de-energization of the single-pole double-throw relay. This energization / de-energization control switching method realizes the core logic of the indicator light being on (anode connected to positive voltage) / off (connected to 0V). When the indicator light does not need to be lit, the single-pole double-throw relay controls the anode of the indicator light to be connected to 0V, ensuring that the potential difference between the anode and cathode of the indicator light is always 0, completely eliminating the influence of induced voltage on the indicator light, without the need for additional components. Furthermore, the control signal from the control unit (such as the electrical signal output by the microcontroller MCU) controls the coil's on / off state, thereby automatically switching the connection state of the indicator light anode. The control logic is simple, the response speed is fast, and no additional complex circuits or components are added, reducing equipment failure points, improving the overall operational reliability of the equipment, and reducing subsequent maintenance costs.
[0047] It is understood that the specific implementation methods and functions of each module / unit in the above different embodiments can be referenced from each other.
[0048] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A control circuit for an indicator light, characterized in that, include: Indicator lights and power module; The cathode of the indicator light is connected to the first voltage output terminal of the power module; When the indicator light needs to be lit, the anode of the indicator light is connected to the second voltage output terminal of the power module; When the indicator light needs to be turned off, the anode of the indicator light is connected to the first voltage output terminal of the power module; The first voltage output terminal provides 0V, and the second voltage output terminal provides a positive voltage.
2. The control circuit for the indicator light as described in claim 1, characterized in that, Also includes: Single-pole double-throw relay; The common terminal of the single-pole double-throw relay is connected to the anode of the indicator light, the normally closed terminal is connected to the first voltage output terminal, and the normally open terminal is connected to the second voltage output terminal. When the indicator light needs to be turned on, the common terminal and normally open terminal of the single-pole double-throw relay are closed; When the indicator light needs to be turned off, the common terminal and normally closed terminal of the single-pole double-throw relay are closed.
3. The control circuit for the indicator light as described in claim 2, characterized in that, The number of indicator lights is multiple, and the number of single-pole double-throw relays is the same as the number of indicator lights; Each single-pole double-throw relay controls the lighting or extinguishing of one indicator light.
4. The control circuit for the indicator light as described in claim 3, characterized in that, The indicator lights include a closing indicator light, a running indicator light, and a fault indicator light; The single-pole double-throw relay corresponding to the closing indicator light is the first relay; The single-pole double-throw relay corresponding to the running indicator light is the second relay; The single-pole double-throw relay corresponding to the fault indicator light is the third relay; When the system equipment is closed, the common terminal and normally open terminal of the first relay are closed, so that the closing indicator light is lit. When the system equipment is in normal operation, the common terminal and normally open terminal of the second relay are closed, and the common terminal and normally closed terminal of the third relay are closed, so that the running indicator light is lit and the fault indicator light is off. When a system device malfunctions, the common terminal and normally closed terminal of the second relay close, and the common terminal and normally open terminal of the third relay close, so that the running indicator light goes out and the fault indicator light illuminates.
5. The control circuit for the indicator light as described in any one of claims 1 to 4, characterized in that, The second voltage output terminal of the power module provides a positive voltage of 12V or 24V.
6. The control circuit for the indicator light as described in any one of claims 1 to 4, characterized in that, The indicator light is a light-emitting diode.
7. A control system for an indicator light, characterized in that, include: The control unit and the control circuit for the indicator light according to any one of claims 1 to 6; The control unit is located between the anode of the indicator light and the power module; The control unit controls the anode of the indicator light to be connected to the second voltage output terminal of the power module; or, controls the anode of the indicator light to be connected to the first voltage output terminal of the power module.
8. The indicator light control system as described in claim 7, characterized in that, The control unit is connected to the single-pole double-throw relay in the control circuit; When the indicator light needs to be turned on, the control unit sends a first control signal to the single-pole double-throw relay to control the closure of the common terminal and normally open terminal of the single-pole double-throw relay; When the indicator light needs to be turned off, the control unit sends a second control signal to the single-pole double-throw relay to control the common terminal and normally closed terminal of the single-pole double-throw relay to close.
9. The indicator light control system as described in claim 8, characterized in that, The number of indicator lights is multiple, and the number of single-pole double-throw relays is the same as the number of indicator lights; each single-pole double-throw relay controls the lighting or extinguishing of one indicator light.
10. The indicator light control system as described in claim 9, characterized in that, The indicator lights include a closing indicator light, a running indicator light, and a fault indicator light; The single-pole double-throw relay corresponding to the closing indicator light is the first relay; The single-pole double-throw relay corresponding to the running indicator light is the second relay; The single-pole double-throw relay corresponding to the fault indicator light is the third relay; When the system equipment is closed, the control unit controls the common terminal and normally open terminal of the first relay to close, so that the closing indicator light is lit. When the system equipment is in normal operation, the control unit controls the common terminal and normally open terminal of the second relay to close, so that the running indicator light is lit, and controls the common terminal and normally closed terminal of the third relay to close, so that the fault indicator light is turned off. When a system device malfunctions, the control unit controls the common terminal and normally closed terminal of the second relay to close, so that the running indicator light goes out, and controls the common terminal and normally open terminal of the third relay to close, so that the fault indicator light comes on.