Indicating circuit of cost-controlled circuit breaker and cost-controlled circuit breaker

Abstract

The utility model discloses an indicating circuit of a cost-controlled circuit breaker and the cost-controlled circuit breaker. The indicating circuit comprises a voltage reduction module, a control module and an indicating module. The input end of the step-down module is used for being connected with a power supply, the first output end of the step-down module is used for being connected with the first input end of the control module, the second output end of the step-down module is used for being connected with the second input end of the control module, and reference voltage is connected to the third input end of the control module; the control module is used for controlling the opening and closing state of the cost control circuit breaker according to the voltage of the first input end; a power supply loop controlled by the cost control circuit breaker is connected to a power supply; the output end of the control module is connected with the indication module, and the indication module is used for indicating the opening and closing state of the cost control circuit breaker. According to the utility model, the power supply condition of the power supply loop can be clearly indicated, so that related personnel can timely know the current power supply condition, and the reliability of the cost control circuit breaker is improved.

Description

Technical Field

[0001] This utility model relates to the field of power metering equipment technology, and in particular to an indicator circuit for a prepaid circuit breaker and the prepaid circuit breaker itself. Background Technology

[0002] A prepaid circuit breaker is a smart electricity metering device typically used for prepaid electricity consumption management. This type of circuit breaker allows users to pay for electricity before use; once the prepaid limit is exhausted, the circuit breaker will stop supplying electricity until the user recharges. A prepaid circuit breaker typically includes an electricity metering section, a communication module, and a control section.

[0003] Electricity metering section: Used to measure and record the user's electricity consumption.

[0004] Communication module: Used to communicate with the power company or other management systems to update users' balance information and control the status of circuit breakers in real time.

[0005] Control section: Used to control the power supply status based on the user's balance, and can cut off the power supply when the balance is insufficient.

[0006] Existing prepaid circuit breakers cannot provide clear indication of the power supply status of the controlled power circuit. Utility Model Content

[0007] This utility model provides an indicator circuit and a prepaid circuit breaker, which can clearly indicate the power supply status of the power supply circuit, so that relevant personnel can know the current power supply status in a timely manner and improve the reliability of the prepaid circuit breaker.

[0008] In a first aspect, this utility model provides an indicator circuit for a prepaid circuit breaker, comprising: a step-down module, a control module, and an indicator module; the input terminal of the step-down module is connected to a power supply, the first output terminal of the step-down module is connected to the first input terminal of the control module, the second output terminal of the step-down module is connected to the second input terminal of the control module, and the third input terminal of the control module is connected to a reference voltage; the control module is used to control the opening and closing state of the prepaid circuit breaker according to the voltage of the first input terminal; the power supply circuit controlled by the prepaid circuit breaker is connected to a power supply; the output terminal of the control module is connected to the indicator module, and the indicator module is used to indicate the opening and closing state of the prepaid circuit breaker.

[0009] Optionally, the control module includes a control chip and a filtering unit; the first pin of the control chip serves as the first input terminal of the control module, the second pin of the control chip serves as the second input terminal of the control module, the third pin of the control chip serves as the third input terminal of the control module, and the fourth pin of the control chip serves as the output terminal of the control module; the first terminal of the filtering unit is connected to the power supply pin of the control chip, and the second terminal of the filtering unit is grounded.

[0010] Optionally, the filtering unit includes a first capacitor and a second capacitor; the first terminal of the first capacitor serves as the first terminal of the filtering unit, and the second terminal of the first capacitor serves as the second terminal of the filtering unit; the second capacitor is connected in parallel with the first capacitor.

[0011] Optionally, the control module further includes a first resistor, a second resistor, and a ferrite bead; the first end of the first resistor is connected to the clock pin of the control chip, and the second end of the first resistor is grounded; the first end of the second resistor is connected to the data pin of the control chip, and the second end of the second resistor is connected to a first voltage; the first end of the ferrite bead is connected to the second end of the second resistor, and the second end of the ferrite bead is connected to the first end of the first capacitor.

[0012] Optionally, the step-down module includes a surge protection unit and a voltage divider unit; the first end of the surge protection unit serves as the input end of the step-down module, the second end of the surge protection unit is connected to the first end of the voltage divider unit and serves as the first output end of the step-down module, the second end of the voltage divider unit is grounded, and the third end of the voltage divider unit serves as the second output end of the step-down module.

[0013] Optionally, the surge protection unit includes a rectifier unit, a first resistor unit, and a second resistor unit; the first end of the rectifier unit serves as the first end of the surge protection unit, the second end of the rectifier unit is connected to the first end of the first resistor unit, the second end of the first resistor unit is connected to the first end of the second resistor unit, and the second end of the second resistor unit serves as the second end of the surge protection unit; and / or, the voltage divider unit includes a third resistor and a fourth resistor; the first end of the third resistor serves as the first end of the voltage divider unit, the second end of the third resistor is connected to the first end of the fourth resistor and serves as the third end of the voltage divider unit, and the second end of the fourth resistor serves as the second end of the voltage divider unit.

[0014] Optionally, the indicator circuit of the prepaid circuit breaker further includes a first bidirectional TVS diode; the first anode of the first bidirectional TVS diode is connected to the first end of the second resistor unit, and the second anode of the first bidirectional TVS diode is grounded.

[0015] Optionally, the indicator circuit of the prepaid circuit breaker also includes a filter module; the first terminal of the filter module is connected to the first output terminal of the step-down module, and the second terminal of the filter module is grounded.

[0016] Optionally, the indicator module includes a light-emitting diode, a second bidirectional TVS diode, and a current-limiting resistor; the anode of the light-emitting diode is connected to the output terminal of the control module, and the cathode of the light-emitting diode is connected to the first anode of the second bidirectional TVS diode and the first terminal of the current-limiting resistor; the second anode of the second bidirectional TVS diode and the second terminal of the current-limiting resistor are both grounded.

[0017] Secondly, this utility model provides a prepaid circuit breaker, including the indicator circuit of the prepaid circuit breaker provided in any embodiment of this utility model.

[0018] The present invention provides an indicator circuit and a prepaid circuit breaker, comprising a step-down module, a control module, and an indicator module. The step-down module detects the power supply voltage of the power supply circuit, the control module performs a threshold judgment on the power supply voltage detected by the step-down module, and the indicator module provides a corresponding indication of the judgment result of the control module. This provides a clear indication of the power supply status of the power supply circuit, enabling relevant personnel to be aware of the current power supply status in a timely manner and improving the reliability of the prepaid circuit breaker.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the indicator circuit of a prepaid circuit breaker provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the indicator circuit of another prepaid circuit breaker provided by this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the indicator circuit of another prepaid circuit breaker provided by this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the indicator circuit of another prepaid circuit breaker provided by this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the indicator circuit of another prepaid circuit breaker provided by this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the indicator circuit of another prepaid circuit breaker provided by this utility model;

[0027] Figure 7 This is a schematic diagram of the indicator circuit of another prepaid circuit breaker provided by this utility model. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0030] Figure 1 This is a schematic diagram of the indicating circuit of a prepaid circuit breaker provided by this utility model. Figure 1 As shown, the indicator circuit of the prepaid circuit breaker includes: a step-down module 11, a control module 12, and an indicator module 13.

[0031] The input terminal of the step-down module 11 is connected to the power supply (i.e., the voltage signal FC1 corresponding to the power supply circuit). The first output terminal of the step-down module 11 is connected to the first input terminal of the control module 12, and the second output terminal of the step-down module 11 is connected to the second input terminal of the control module 12. The third input terminal of the control module 12 is connected to the reference voltage Vref1. The control module 12 controls the opening and closing state of the prepaid circuit breaker according to the voltage at the first input terminal. The power supply circuit controlled by the prepaid circuit breaker is connected to the power supply.

[0032] The output of the control module 12 is connected to the indicator module 13, which is used to indicate the opening and closing status of the prepaid circuit breaker.

[0033] Specifically, the buck module 11 is used to reduce the input voltage signal to meet the operating voltage requirements of subsequent modules, ensuring the normal operation of the entire indicating circuit. The buck module 11 can be a voltage divider circuit, a voltage conversion circuit, etc. The voltage divider circuit can be any device or combination of devices with voltage drop capability, such as resistors or semiconductor devices. A voltage conversion circuit is a circuit that converts one voltage to another. The voltage conversion circuit can be any of the following: a buck converter, a flyback converter, an isolated DC-DC converter, or a resonant converter.

[0034] Since the voltage amplitude of the voltage signal in the power supply circuit is usually high, exceeding the operating voltage range of the control module 12, directly inputting the voltage signal from the power supply circuit to the control module 12 would not only prevent the control module 12 from performing the voltage comparison function, but would also damage the control module 12. Therefore, to address this situation, a step-down module 11 is needed to reduce the voltage, thereby inputting a voltage signal with a smaller amplitude to the control module 12, enabling the control module 12 to perform the voltage comparison function without causing damage to the control module 12.

[0035] The control module 12 may include a microcontroller. Optionally, the control module 12 may include a microcontroller, or a digital signal processor (DSP) or a field-programmable gate array (FPGA).

[0036] In some embodiments, when the voltage at the first input terminal of the control module 12 is greater than or equal to the first set value, the control module 12 controls the prepaid circuit breaker to be in the closed state, and when the voltage at the first input terminal of the control module 12 is less than the first set value, the control module 12 controls the prepaid circuit breaker to be in the open state.

[0037] In some embodiments, when the voltage at the second input terminal of the control module 12 is less than the reference voltage Vref1, the control module 12 outputs a first level signal as a comparison result; when the voltage at the second input terminal of the control module 12 is greater than the reference voltage Vref1, the control module 12 outputs a second level signal as a comparison result.

[0038] The indicator module 13 can perform corresponding indication actions based on the comparison result received from the control module 12, thereby achieving the corresponding indication purpose. For example, the indicator module 13 can be an indicator light, which turns on or off according to the comparison result. Alternatively, the indicator module 13 can be a buzzer, which turns on or off according to the comparison result. Or, the indicator module 13 can be a corresponding display device, which displays corresponding content based on the comparison result, such as "voltage exceeds threshold" or "voltage does not exceed threshold". In other embodiments, the indicator module 13 can be any type of device or apparatus, the purpose of which is to indicate the comparison result so that relevant personnel can perceive it.

[0039] It should be noted that the indicator circuit of the prepaid circuit breaker in this embodiment is used to indicate the power supply status of the power supply circuit controlled by the prepaid circuit breaker. Therefore, it is necessary to pre-set the step-down coefficient of the step-down module 11 and the reference voltage Vref1 according to the voltage threshold of the power supply status to be indicated. For example, in the application process, it is necessary to indicate whether the voltage signal of the power supply circuit is less than 132V (60% of 220V, which is usually used as the closing amplitude condition) or greater than 132V. Then, the amplitude of the reference voltage Vref1 is equal to the product of the voltage signal of the power supply circuit and the step-down coefficient of the step-down module 11. In other words, when a 132V voltage signal is input to the step-down module 11, if the step-down module 11 outputs a 1V voltage signal, then the reference voltage Vref1 also needs to be 1V.

[0040] by Figure 1 Taking the circuit structure shown as an example, the specific working process of the indicator circuit of the prepaid circuit breaker provided in this embodiment is as follows:

[0041] The power supply provides a voltage signal FC1 for the power supply circuit, which first enters the step-down module 11. After the step-down module 11 steps down the input voltage, its first output terminal outputs the stepped-down voltage to the first input terminal of the control module 12. The control module 12 controls the opening and closing status of the circuit breaker according to the voltage at the first input terminal.

[0042] Simultaneously, the voltage output from the second output terminal of the step-down module 11 is sent to the second input terminal of the control module 12. The control module 12 compares the voltage at the second input terminal with the input reference voltage Vref1 and outputs the comparison result. For example, when the voltage at the second input terminal of the control module 12 is less than the reference voltage Vref1, the control module 12 outputs a first-level signal as the comparison result; when the voltage at the second input terminal of the control module 12 is greater than the reference voltage Vref1, the control module 12 outputs a second-level signal as the comparison result. The first-level signal and the second-level signal are high and low level signals, respectively. For example, the first-level signal is a low-level signal, and the second-level signal is a high-level signal.

[0043] The indicator module 13 provides indication based on the received comparison result. If the control module 12 outputs a second-level signal, meaning the voltage at the second input terminal of the control module 12 is greater than the reference voltage Vref1, the indicator module 13 is illuminated to indicate that the prepaid circuit breaker is in the closed state. Conversely, if the control module 12 outputs a first-level signal, meaning the voltage at the second input terminal of the control module 12 is less than the reference voltage Vref1, the indicator module 13 is extinguished to indicate that the prepaid circuit breaker is in the open state. The entire process, through the coordinated operation of the step-down module 11, the control module 12, and the indicator module 13, achieves accurate indication of the open / closed state of the prepaid circuit breaker, allowing users to intuitively understand the operating status of the prepaid circuit breaker.

[0044] The present invention provides an indicator circuit and a prepaid circuit breaker, comprising a step-down module, a control module, and an indicator module. The step-down module detects the power supply voltage of the power supply circuit, the control module performs a threshold judgment on the power supply voltage detected by the step-down module, and the indicator module provides a corresponding indication of the judgment result of the control module. This provides a clear indication of the power supply status of the power supply circuit, enabling relevant personnel to be aware of the current power supply status in a timely manner and improving the reliability of the prepaid circuit breaker.

[0045] Figure 2 This is a schematic diagram of the indicator circuit of another prepaid circuit breaker provided by this utility model. (See diagram below.) Figure 2 As shown, optionally, the control module 12 includes a control chip U1 and a filter unit 121.

[0046] The first pin PA1 of the control chip U1 serves as the first input terminal of the control module 12, the second pin PA2 of the control chip U1 serves as the second input terminal of the control module 12, the third pin PA3 of the control chip U1 serves as the third input terminal of the control module 12, and the fourth pin PA4 of the control chip U1 serves as the output terminal of the control module 12; the first terminal of the filter unit 121 is connected to the power supply pin VDD of the control chip U1, and the second terminal of the filter unit 121 is grounded.

[0047] Specifically, in the indicator circuit of the prepaid circuit breaker, the filter unit 121 is used to filter the power supply of the control chip U1 to ensure the stability and smoothness of the power supply voltage, reduce noise, interference and harmonic components in the power supply, so as to ensure that the control chip U1 can work normally and reliably.

[0048] As an optional implementation method provided in this embodiment, Figure 3 This is a schematic diagram of the structure of the indicator circuit of another prepaid circuit breaker provided in this utility model embodiment, combined with... Figure 2 and Figure 3 The filter unit 121 includes a first capacitor C1 and a second capacitor C2. The first terminal of the first capacitor C1 serves as the first terminal of the filter unit 121, and the second terminal of the first capacitor C1 serves as the second terminal of the filter unit 121. The second capacitor C2 is connected in parallel with the first capacitor C1.

[0049] Optionally, continue to refer to Figure 3 The control module 12 also includes a first resistor R1, a second resistor R2, and a ferrite bead L1. The first end of the first resistor R1 is connected to the clock pin SWCLK of the control chip U1, and the second end of the first resistor R1 is grounded. The first end of the second resistor R2 is connected to the data pin SWDIO of the control chip U1, and the second end of the second resistor R2 is connected to the first voltage VCC. The first end of the ferrite bead L1 is connected to the second end of the second resistor R2, and the second end of the ferrite bead L1 is connected to the first end of the first capacitor C1.

[0050] Specifically, the first resistor R1 is used to provide a certain impedance on the clock signal line of the control chip U1, which plays the roles of current limiting and impedance matching, ensuring stable transmission of the clock signal and preventing problems such as overcurrent on the clock signal line from affecting the normal operation of the control chip U1.

[0051] The second resistor R2 is used to provide impedance on the data signal line to ensure the stability of the data signal during transmission. At the same time, it works in conjunction with the first voltage VCC to provide a suitable bias voltage or operating conditions for the data pin SWDIO, ensuring normal data reading, writing and transmission.

[0052] The ferrite bead L1 has inductive characteristics, exhibiting higher impedance at high frequencies and lower impedance at low frequencies. It is used to filter out high-frequency noise and interference signals on the power supply line, preventing high-frequency interference from entering the power supply circuit of the control chip U1, further improving the purity of the power supply, and ensuring the stable operation of the control chip U1.

[0053] The clock pin SWCLK of the control chip U1 is used to transmit the clock signal required for the operation of the control chip U1. The clock signal determines the timing and synchronization of various operations inside the chip and is one of the key signals for the normal operation of the chip.

[0054] The data pin SWDIO of the control chip U1 is the interface pin for data transmission between the control chip U1 and external devices or debugging tools. It is used for reading and writing data, configuring chip parameters, and other operations to realize the control of the chip and data interaction.

[0055] Figure 4 This is a schematic diagram of the indicator circuit of another prepaid circuit breaker provided in this embodiment of the utility model. (Reference) Figure 4 Optionally, the step-down module 11 includes a surge protection unit 111 and a voltage divider unit 112.

[0056] The first end of the surge protection unit 111 serves as the input end of the step-down module 11. The second end of the surge protection unit 111 is connected to the first end of the voltage divider unit 112 and serves as the first output end of the step-down module 11. The second end of the voltage divider unit 112 is grounded, and the third end of the voltage divider unit 112 serves as the second output end of the step-down module 11.

[0057] Continue to refer to Figure 4 Optionally, the surge protection unit 111 includes a rectifier unit 1, a first resistor unit 2, and a second resistor unit 3.

[0058] The first end of the rectifier unit 1 serves as the first end of the surge protection unit 111. The second end of the rectifier unit 1 is connected to the first end of the first resistor unit 2. The second end of the first resistor unit 2 is connected to the first end of the second resistor unit 3. The second end of the second resistor unit 3 serves as the second end of the surge protection unit 111.

[0059] And / or, the voltage divider unit 112 includes a third resistor R3 and a fourth resistor R4; the first end of the third resistor R3 serves as the first end of the voltage divider unit 112, the second end of the third resistor R3 is connected to the first end of the fourth resistor R4 and serves as the third end of the voltage divider unit 112, and the second end of the fourth resistor R4 serves as the second end of the voltage divider unit 112.

[0060] Specifically, rectifier unit 1 is used to convert AC signals into DC signals. Optionally, rectifier unit 1 includes a rectifier diode D1, with the anode of rectifier diode D1 serving as the first terminal of rectifier unit 1 and the cathode of rectifier diode serving as the second terminal of rectifier unit 1. First resistor unit 2 includes a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7, and second resistor unit 3 includes an eighth resistor R8.

[0061] Continue to refer to Figure 4 Optionally, the indicator circuit of the prepaid circuit breaker also includes a first bidirectional TVS transistor TVS1, the first anode of the first bidirectional TVS transistor TVS1 is connected to the first end of the second resistor unit 3, and the second anode of the first bidirectional TVS transistor TVS1 is grounded.

[0062] Figure 5This is a schematic diagram of the indicator circuit of another prepaid circuit breaker provided in this embodiment of the utility model. (Reference) Figure 5 Optionally, the indicator circuit of the prepaid circuit breaker also includes a filter module 14, the first end of which is connected to the first output end of the step-down module 11, and the second end of the filter module 14 is grounded.

[0063] Specifically, the signal at the first output terminal of the step-down module 11 (hereinafter referred to as the fee control signal) is used to instruct the fee control circuit breaker to perform closing or opening operations. If there is noise in the fee control signal, the control module 12 may make a misjudgment, and thus perform a closing operation when it should not be performed, affecting the reliability of the closing control. Therefore, in this embodiment, a filtering module 14 is added to filter and remove noise from the fee control signal, ensuring that the fee control signal input to the step-down module 11 to the control module 12 is free of noise, thereby ensuring the reliability of the closing control.

[0064] Optionally, the filtering module 14 includes a third capacitor C3, with the first end of the third capacitor C3 serving as the first end of the filtering module 14 and the second end of the third capacitor C3 serving as the second end of the filtering module 14.

[0065] Figure 6 This is a schematic diagram of the indicator circuit of another prepaid circuit breaker provided in this embodiment of the utility model. (Reference) Figure 6 Optionally, the indicator module 13 includes a light-emitting diode D2, a second bidirectional TVS diode TVS2, and a current-limiting resistor R9. The anode of the light-emitting diode D2 is connected to the output terminal of the control module 12, and the cathode of the light-emitting diode D2 is connected to the first anode of the second bidirectional TVS diode TVS2 and the first terminal of the current-limiting resistor R9; the second anode of the second bidirectional TVS diode TVS2 and the second terminal of the current-limiting resistor R9 are both grounded.

[0066] The second bidirectional TVS diode, TVS2, is primarily used to prevent static electricity. When static electricity is present, it can quickly release through a ground loop, increasing its anti-static capability. The current-limiting resistor R59 is mainly used to limit the current flowing through the LED D2, thereby adjusting the brightness of the LED D2. Specifically, the high-level voltage amplitude output to the control module 12 can be predetermined, and then the resistance value of the current-limiting resistor R9 can be determined based on this amplitude, the internal resistance of the LED D2, and the desired brightness. In other embodiments, the current-limiting resistor R9 can be replaced with a variable resistor, thereby enabling adjustment of the brightness of the LED D2 during use.

[0067] When the control module 12 outputs a second-level signal (e.g., a high-level signal), a voltage drop occurs between the anode and cathode of LED D2, current flows through LED D2, and LED D2 lights up. When the control module 12 outputs a first-level signal (e.g., a low-level signal), there is no voltage drop between the anode and cathode of LED D2, no current flows through LED D2, and LED D2 does not light up. Thus, when the voltage signal FC1 of the power supply circuit is high, the control module 12 receives a prepaid control signal indicating that the circuit is closed, and the control module 12 outputs a second-level signal, causing LED D2 to light up. When the voltage signal FC1 of the power supply circuit is low, the control module 12 receives a prepaid control signal indicating that the circuit is not closed, and the control module 12 outputs a first-level signal, causing LED D2 to not light up. In summary, when the voltage signal FC1 of the power supply circuit is high, the light is on and the circuit is closed; when the voltage signal FC1 of the power supply circuit is low, the light is off and the circuit is not closed.

[0068] Figure 7 This is a schematic diagram of the indicator circuit of another prepaid circuit breaker provided in this embodiment of the utility model. (Reference) Figure 7 The indicator circuit of the prepaid circuit breaker includes: a step-down module 11, a control module 12, and an indicator module 13.

[0069] Optionally, the control module 12 includes a control chip U1 and a filter unit 121. The filter unit 121 includes a first capacitor C1 and a second capacitor C2. The control module 12 also includes a first resistor R1, a second resistor R2, and a ferrite bead L1.

[0070] Optionally, the step-down module 11 includes a surge protection unit 111 and a voltage divider unit 112. The surge protection unit 111 includes a rectifier unit 1, a first resistor unit 2, and a second resistor unit 3. The voltage divider unit 112 includes a third resistor R3 and a fourth resistor R4. The rectifier unit 1 includes a rectifier diode D1. The first resistor unit 2 includes a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7, and the second resistor unit 3 includes an eighth resistor R8.

[0071] Optionally, the indicator circuit of the prepaid circuit breaker further includes a first bidirectional TVS diode (TVS1) and a filter module 14. Optionally, the filter module 14 includes a third capacitor (C3). Optionally, the indicator module 13 includes a light-emitting diode (D2), a second bidirectional TVS diode (TVS2), and a current-limiting resistor (R9).

[0072] Optionally, the indicating circuit of the prepaid circuit breaker further includes a tenth resistor R10 and an eleventh resistor R11. The first terminal of the tenth resistor R10 is connected to the first voltage VCC1, the second terminal of the tenth resistor R10 is connected to the first terminal of the eleventh resistor R11, and the second terminal of the eleventh resistor R11 is grounded. The reference voltage Vref1 is the voltage obtained by dividing the first voltage VCC1 (e.g., 3.3V) by the tenth resistor R10 and the eleventh resistor R11.

[0073] Based on the same inventive concept, this utility model also provides a prepaid circuit breaker, including the indicator circuit of the prepaid circuit breaker provided in any embodiment of this utility model, which has the corresponding functional modules and beneficial effects of the indicator circuit, which will not be described in detail here.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An indicator circuit for a prepaid circuit breaker, characterized in that, include: Step-down module, control module, and indicator module; The input terminal of the step-down module is used to connect to the power supply, the first output terminal of the step-down module is used to connect to the first input terminal of the control module, the second output terminal of the step-down module is used to connect to the second input terminal of the control module, and the third input terminal of the control module is connected to a reference voltage; the control module is used to control the opening and closing state of the prepaid circuit breaker according to the voltage of the first input terminal; the power supply circuit controlled by the prepaid circuit breaker is connected to the power supply. The output of the control module is connected to the indicator module, which is used to indicate the opening and closing status of the prepaid circuit breaker.

2. The indicator circuit of the prepaid circuit breaker according to claim 1, characterized in that, The control module includes a control chip and a filtering unit; The first pin of the control chip serves as the first input terminal of the control module, the second pin of the control chip serves as the second input terminal of the control module, the third pin of the control chip serves as the third input terminal of the control module, and the fourth pin of the control chip serves as the output terminal of the control module. The first end of the filtering unit is connected to the power supply pin of the control chip, and the second end of the filtering unit is grounded.

3. The indicator circuit of the prepaid circuit breaker according to claim 2, characterized in that, The filtering unit includes a first capacitor and a second capacitor; The first end of the first capacitor serves as the first end of the filter unit, and the second end of the first capacitor serves as the second end of the filter unit. The second capacitor is connected in parallel with the first capacitor.

4. The indicating circuit of the prepaid circuit breaker according to claim 3, characterized in that, The control module also includes a first resistor, a second resistor, and a magnetic bead; The first end of the first resistor is connected to the clock pin of the control chip, and the second end of the first resistor is grounded. The first end of the second resistor is connected to the data pin of the control chip, and the second end of the second resistor is connected to the first voltage. The first end of the magnetic bead is connected to the second end of the second resistor, and the second end of the magnetic bead is connected to the first end of the first capacitor.

5. The indicating circuit of the prepaid circuit breaker according to claim 1, characterized in that, The voltage reduction module includes a surge protection unit and a voltage divider unit; The first end of the surge protection unit serves as the input end of the step-down module. The second end of the surge protection unit is connected to the first end of the voltage divider unit and serves as the first output end of the step-down module. The second end of the voltage divider unit is grounded, and the third end of the voltage divider unit serves as the second output end of the step-down module.

6. The indicating circuit of the prepaid circuit breaker according to claim 5, characterized in that, The surge protection unit includes a rectifier unit, a first resistor unit, and a second resistor unit; The first end of the rectifier unit serves as the first end of the surge protection unit, the second end of the rectifier unit is connected to the first end of the first resistor unit, the second end of the first resistor unit is connected to the first end of the second resistor unit, and the second end of the second resistor unit serves as the second end of the surge protection unit. And / or, the voltage divider unit includes a third resistor and a fourth resistor; the first end of the third resistor serves as the first end of the voltage divider unit, the second end of the third resistor is connected to the first end of the fourth resistor and serves as the third end of the voltage divider unit, and the second end of the fourth resistor serves as the second end of the voltage divider unit.

7. The indicating circuit of the prepaid circuit breaker according to claim 6, characterized in that, It also includes the first bidirectional TVS tube; The first anode of the first bidirectional TVS diode is connected to the first end of the second resistor unit, and the second anode of the first bidirectional TVS diode is grounded.

8. The indicating circuit of the prepaid circuit breaker according to claim 1, characterized in that, It also includes a filtering module; The first terminal of the filter module is connected to the first output terminal of the step-down module, and the second terminal of the filter module is grounded.

9. The indicating circuit of the prepaid circuit breaker according to claim 1, characterized in that, The indicator module includes a light-emitting diode, a second bidirectional TVS diode, and a current-limiting resistor; The anode of the light-emitting diode is connected to the output terminal of the control module, and the cathode of the light-emitting diode is connected to the first anode of the second bidirectional TVS diode and the first terminal of the current-limiting resistor. The second anode of the second bidirectional TVS diode and the second terminal of the current-limiting resistor are both grounded.

10. A prepaid circuit breaker, characterized in that, Includes the indicator circuit of the prepaid circuit breaker as described in any one of claims 1 to 9.

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