Direct-current short-circuit short-delay controller
By employing a control power supply circuit design with transistor current amplification and feedback diode voltage regulation in a DC molded case circuit breaker, the problems of high cost, low power, and poor stability in the existing technology are solved, achieving low-cost, high-power output, and stable short-circuit short-delay protection.
Patent Information
- Application Number
- CN202422675513.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-04
AI Technical Summary
Existing short-circuit short-delay controllers for DC molded case circuit breakers suffer from high cost, low power output, and poor stability. In particular, the imported high-voltage LDO solution is too expensive and carries a high risk of power outage, while the resistor plus Zener diode solution has low power output, excessive internal resistance of the power supply, and poor stability.
The control power supply circuit design uses transistors for current amplification and feedback diodes for voltage regulation. Combined with rectifier bridge circuit and surge protection circuit, the trip unit is triggered by the delay control unit to achieve short-circuit short-delay protection. It has low cost, high power output, low power supply internal resistance and good stability.
It achieves low-cost, high-power output, and good stability short-circuit short-delay protection, reducing the cost of the control power supply section of the circuit breaker and improving the stability and reliability of the power supply.
Smart Images
Figure CN223514593U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of DC molded case circuit breakers, specifically relating to a DC short-circuit short-delay controller. Background Technology
[0002] DC molded case circuit breakers typically have three protection stages: overload long-delay protection, short-circuit short-delay protection, and short-circuit instantaneous protection. The short-circuit short-delay control is handled electronically (i.e., by the controller). This controller triggers the circuit breaker's trip unit based on the user-set delay time, achieving delayed tripping and selective protection. The high-voltage power supply section is both a key focus and a challenging aspect of this design. For example... Figure 1 and Figure 2 As shown, in the existing technology, common controllers mainly adopt the following two schemes to achieve short-circuit short-delay control: one is to use an imported high-voltage LDO (Low Dropout Regulator) to power the subsequent stage in the control power supply section, and the other is to use a resistor plus Zener diode to power the subsequent stage in the control power supply section. The above two schemes have the following disadvantages:
[0003] (1) Imported high-voltage LDO solutions are too expensive and there is also the risk of supply disruption.
[0004] (2) The resistor plus Zener diode scheme has a small power output, excessive internal resistance of the power supply, and poor stability. Utility Model Content
[0005] To address the aforementioned problems, the purpose of this invention is to provide a DC short-circuit short-delay controller that can achieve short-circuit short-delay protection, has low cost, high power output, low power supply internal resistance, and good stability.
[0006] The objective of this utility model is achieved through the following technical solution:
[0007] A DC short-circuit short-delay controller includes a trip unit J1, a power supply terminal J2 for power supply, an energy storage circuit for connecting to the power supply terminal J2 and storing electrical energy, a control power supply circuit for stepping down a DC voltage signal and supplying power to the subsequent stage, an execution unit for controlling the trip unit J1 to trip, and a delay control unit for controlling the delay action of the trip unit J1. The positive input terminal IN1 of the energy storage circuit is connected to the positive output terminal (connection point 1) of the power supply terminal J2, and the negative input terminal IN2 of the energy storage circuit is connected to the negative output terminal (connection point 2) of the power supply terminal J2. The input terminal of the control power supply circuit is connected to the positive output terminal OUT1 of the energy storage circuit, and the output terminal VCC of the control power supply circuit is connected to the input terminal of the delay control unit. The signal output terminal of the delay control unit is connected to the signal input terminal CT_CTRL of the execution unit. The positive input terminal of the execution unit is connected to the positive output terminal OUT1 of the energy storage circuit, and the negative input terminal of the execution unit is connected to the negative output terminal OUT2 of the energy storage circuit. The two output terminals of the execution unit are respectively connected one-to-one to the two connection points of the trip unit.
[0008] The control power supply circuit includes resistors R2, R3, and R6, capacitors C3 and C4, a Zener diode ZD1, a diode D7, and a transistor Q2. One end of resistor R2 and one end of resistor R3 are both connected to the positive output terminal OUT1 of the energy storage circuit. The other end of resistor R2 is connected to one end of capacitor C4, the cathode of Zener diode ZD1, the cathode of diode D7, and the base of transistor Q2. The other end of resistor R3 is connected to the collector of transistor Q2. The other end of capacitor C4 and the anode of Zener diode ZD1 are both grounded. The anode of diode D7, the emitter of transistor Q2, the anode of capacitor C3, and one end of resistor R6 are all connected to the output terminal VCC of the control power supply circuit. The cathode of capacitor C3 and the other end of resistor R6 are both grounded. The control power supply circuit uses transistor Q2 for current amplification and diode D7 for feedback voltage regulation.
[0009] Furthermore, the energy storage circuit includes a rectifier bridge circuit to prevent malfunction of the downstream stage due to reversed voltage input polarity, a surge protection circuit PTC1 to prevent front-end surges and controller overcurrent, a capacitor C1, a resistor R4, a diode D4, and a dry contact switch J3; the positive input terminal A1 of the rectifier bridge circuit is connected to the positive input terminal IN1 of the energy storage circuit, the negative input terminal A2 of the rectifier bridge circuit is connected to the negative input terminal IN2 of the energy storage circuit, and the positive output terminal B1 of the rectifier bridge circuit is connected to the surge protection circuit. 1. The negative output terminal B2 of the rectifier bridge circuit is connected to the third terminal of the surge protection circuit, one end of the resistor R4, the positive terminal of the diode D4, and terminal 1 of the dry contact switch J3, and grounded; the terminal 2 of the surge protection circuit and the positive terminal of the capacitor C1 are both connected to the positive output terminal OUT1 of the energy storage circuit; the negative terminal of the capacitor C1 is connected to the other end of the resistor R4 and the negative terminal of the diode D4; the terminal 2 of the dry contact switch J3 is connected to the negative output terminal OUT2 of the energy storage circuit.
[0010] Furthermore, the execution unit includes a diode D3, a resistor R1, a MOSFET Q1, a resistor R5, and a capacitor C2; the positive terminal of the diode D3 is connected to one end of the resistor R1, and the negative terminal of the diode D3 is connected to the positive output terminal OUT1 of the energy storage circuit and the terminal 1 of the trip unit J1; the other end of the resistor R1 and the drain of the MOSFET Q1 are both connected to the terminal 2 of the trip unit J1; one end of the resistor R5, one end of the capacitor C2, and the gate of the MOSFET Q1 are all connected to the signal input terminal CT_CTRL of the execution unit; the other end of the resistor R5, the other end of the capacitor C2, and the source of the MOSFET Q1 are all connected to the negative output terminal OUT2 of the energy storage circuit and grounded.
[0011] In one embodiment of this utility model, the delay control unit includes resistors R7, R8, R9, R10, R11, R12, R13, and R14, an encoding switch RW1, a comparator U1, and a capacitor C5; one end of resistors R7, R8, R9, R10, R11, and R12, as well as terminal 8 of comparator U1, are all connected to the output terminal VCC of the control power supply circuit; the other end of resistor R7 and terminal 1 of comparator U1 are connected to the execution unit. The signal input terminal CT_CTRL is connected; the other end of resistor R8 and one end of resistor R13 are both connected to terminal 2 of comparator U1; the other ends of resistors R9, R10, R11, and R12 are connected one-to-one to terminals 1, 2, 4, and 8 of encoder switch RW1; terminal C of encoder switch RW1, the positive terminal of capacitor C5, and one end of resistor R14 are all connected to terminal 3 of comparator U1; the other ends of resistor R13, R14, the negative terminal of capacitor C5, and terminal 4 of comparator U1 are all grounded.
[0012] In another embodiment of this utility model, the delay control unit includes resistors R15, R16, R17, R18, and R19, an encoding switch RW2, and a microcontroller (MCU). One end of resistors R15, R16, R17, and R18, as well as one connection point of the MCU, are connected to the output terminal VCC of the control power supply circuit. The other ends of resistors R15, R16, R17, and R18 are connected one-to-one to the other four connection points of the MCU, and then sequentially connected one-to-one to connection points 1, 2, 4, and 8 of the encoding switch RW2. The two ends of resistor R19 are connected to another connection point of the MCU and the signal input terminal CT_CTRL of the execution unit. Connection point C of the encoding switch RW2 is grounded.
[0013] The beneficial effects of this utility model are as follows:
[0014] The control power supply section of this utility model uses transistor Q2 for current amplification and feedback diode D7 for feedback voltage regulation. It obtains the delay time according to the set delay level and triggers the trip unit to complete the short-circuit short-delay protection. It has low cost, high power output, low power supply internal resistance, and good stability. Attached Figure Description
[0015] The structure of this utility model will be further described in detail below with reference to the accompanying drawings.
[0016] Figure 1This is a circuit diagram of the control power supply section in the existing technology that uses an imported high-voltage LDO solution.
[0017] Figure 2 This is a circuit diagram of the control power supply section in the existing technology that uses a resistor plus Zener diode scheme.
[0018] Figure 3 This is a circuit block diagram of the DC short-circuit short-delay controller described in this utility model.
[0019] Figure 4 This is a circuit diagram of the DC short-circuit short-delay controller described in Embodiment 1 of this utility model.
[0020] Figure 5 This is a circuit diagram of the DC short-circuit short-delay controller described in Embodiment 2 of this utility model.
[0021] The diagram shows: 10 - energy storage circuit, 20 - control power supply circuit, 30 - execution unit, and 40 - delay control unit. Detailed Implementation
[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. The described embodiments are merely some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. It should be noted that the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Example 1
[0024] like Figure 3-5As shown, this embodiment provides a DC short-circuit short-delay controller, including a trip unit J1 for tripping the circuit breaker, a power supply terminal J2 for power supply, an energy storage circuit 10 for connecting to the power supply terminal J2 and storing electrical energy, a control power supply circuit 20 for stepping down the DC voltage signal and supplying power to the subsequent stage, an execution unit 30 for controlling the trip unit J1 to trip, and a delay control unit 40 for controlling the delayed action of the trip unit J1.
[0025] The energy storage circuit 10 has two input terminals, namely a positive input terminal IN1 and a negative input terminal IN2, and two output terminals, namely a positive output terminal OUT1 and an output terminal OUT2. The positive input terminal IN1 of the energy storage circuit 10 is connected to the positive output terminal (connection point 1) of the power supply terminal J2, and the negative input terminal IN2 of the energy storage circuit 10 is connected to the negative output terminal (connection point 2) of the power supply terminal J2. The input terminal of the control power supply circuit 20 is connected to the positive output terminal OUT1 of the energy storage circuit 10, and the output terminal VCC of the control power supply circuit 20 is connected to the input terminal of the delay control unit 40. The signal output terminal of the delay control unit 40 is connected to the signal input terminal CT_CTRL of the execution unit 30. The positive input terminal of the execution unit 30 is connected to the positive output terminal OUT1 of the energy storage circuit 10, and the negative input terminal of the execution unit 30 is connected to the negative output terminal OUT2 of the energy storage circuit 10. The two output terminals of the execution unit 30 are connected one-to-one to the two connection points of the trip unit.
[0026] The energy storage circuit 10 includes a rectifier bridge circuit, a surge protection circuit PTC1 with three connection points, a capacitor C1 as a backup power storage capacitor, a resistor R4 as a current-limiting resistor for charging C1, a diode D4 as a current-carrying diode to power the subsequent stage of capacitor C1, and a dry contact switch J3 with two connection points. The rectifier bridge circuit has two input terminals (A1 and A2) and two output terminals (B1 and B2), wherein the positive input terminal A1 of the rectifier bridge circuit is connected to the positive input terminal IN1 of the energy storage circuit 10, and the negative input terminal A2 of the rectifier bridge circuit is connected to the negative input terminal IN1 of the energy storage circuit 10. Terminal IN2, the positive output terminal B1 of the rectifier bridge circuit is connected to terminal 1 of the surge protection circuit, the negative output terminal B2 of the rectifier bridge circuit is connected to the third terminal of the surge protection circuit, one end of resistor R4, the positive terminal of diode D4, and terminal 1 of dry terminal switch J3 and grounded; terminal 2 of the surge protection circuit and the positive terminal of capacitor C1 are both connected to the positive output terminal OUT1 of energy storage circuit 10; the negative terminal of capacitor C1 is connected to the other end of resistor R4 and the negative terminal of diode D4; terminal 2 of dry terminal switch J3 is connected to the negative output terminal OUT2 of energy storage circuit 10.
[0027] The rectifier bridge circuit is used to prevent the voltage input line from being reversed, which would cause the subsequent stage to malfunction. The rectifier bridge circuit is composed of diodes D1, D2, D5, and D6. The positive terminal of diode D1 and the negative terminal of diode D5 are connected to the positive input terminal A1 of the rectifier bridge circuit. The positive terminal of diode D2 and the negative terminal of diode D6 are connected to the negative input terminal A2 of the rectifier bridge circuit. The negative terminals of diodes D1 and D2 are connected to the positive output terminal B1 of the rectifier bridge circuit. The positive terminals of diodes D5 and D6 are connected to the negative output terminal B2 of the rectifier bridge circuit.
[0028] The surge protection circuit PTC1 is used to prevent front-end surges and overcurrent in the controller. The surge protection circuit PTC1 is composed of a positive temperature coefficient thermistor PTC and a varistor RV. One end of the positive temperature coefficient thermistor PTC is connected to the connection point 1 of the surge protection circuit, one end of the varistor RV is connected to the third connection point of the surge protection circuit, and the other ends of the positive temperature coefficient thermistor PTC and the other end of the varistor RV are both connected to the connection point 2 of the surge protection circuit.
[0029] The control power supply circuit 20 includes resistors R2, R3, and R6, capacitors C3 and C4, a Zener diode ZD1, a diode D7, and a transistor Q2. Zener diode ZD1 is a voltage regulator, resistor R3 is a current-limiting resistor for ZD1, and capacitor C4 is a filter capacitor; these three components constitute the regulated reference power supply output. Transistor Q2 is a high-voltage transistor, R2 is a current-limiting resistor for Q2, diode D7 is a feedback diode for Q2, and capacitor C4 is a power output filter capacitor to ensure stable VCC output. One end of resistor R2 is connected to resistor R3... One end of each resistor is connected to the positive output terminal OUT1 of the energy storage circuit 10; the other end of resistor R2 is connected to one end of capacitor C4, the negative terminal of Zener diode ZD1, the negative terminal of diode D7, and the base of transistor Q2; the other end of resistor R3 is connected to the collector of transistor Q2; the other end of capacitor C4 and the positive terminal of Zener diode ZD1 are both grounded; the positive terminal of diode D7, the emitter of transistor Q2, the positive terminal of capacitor C3, and one end of resistor R6 are all connected to the output terminal VCC of control power supply circuit 20, and the negative terminal of capacitor C3 and the other end of resistor R6 are both grounded.
[0030] The execution unit 30 includes a diode D3, a resistor R1, a MOSFET Q1, a resistor R5, and a capacitor C2. Diode D3 is the freewheeling diode of the trip unit, and resistor R1 is the current-limiting resistor for diode D3. MOSFET Q1 is the driving MOSFET for trip unit J1, and resistor R5 is the pull-down resistor for MOSFET Q1 to ensure a low level. Capacitor C2 is the filter capacitor for the gate of MOSFET Q1 to filter out spikes. The positive terminal of diode D3 is connected to one end of resistor R1, and the negative terminal of diode D3... The positive output terminal OUT1 of the energy storage circuit 10 and the terminal 1 of the trip unit J1 are respectively connected; the other end of the resistor R1 and the drain of the MOSFET Q1 are both connected to the terminal 2 of the trip unit J1; one end of the resistor R5, one end of the capacitor C2 and the gate of the MOSFET Q1 are all connected to the signal input terminal CT_CTRL of the execution unit 30; the other end of the resistor R5, the other end of the capacitor C2 and the source of the MOSFET Q1 are all connected to the negative output terminal OUT2 of the energy storage circuit 10 and grounded.
[0031] The delay control unit 40 includes resistors R7, R8, R9, R10, R11, R12, R13, and R14, an encoding switch RW1, a comparator U1, and a capacitor C5. One end of resistors R7, R8, R9, R10, R11, and R12, as well as terminal 8 of comparator U1, are connected to the output terminal VCC of the control power supply circuit 20. The other end of resistor R7 and terminal 1 of comparator U1 are connected to the signal input terminal of the execution unit 30. CT_CTRL connection; the other end of resistor R8 and one end of resistor R13 are connected to terminal 2 of comparator U1; the other ends of resistors R9, R10, R11, and R12 are connected one-to-one to terminals 1, 2, 4, and 8 of encoder switch RW1; terminal C of encoder switch RW1, the positive terminal of capacitor C5, and one end of resistor R14 are connected to terminal 3 of comparator U1; the other ends of resistor R13, R14, C5, and terminal 4 of comparator U1 are all grounded.
[0032] The working principle is as follows:
[0033] The DC voltage signal line is introduced from the circuit breaker input terminal, and then connected to the energy storage circuit 10 via the power supply terminal J2. The energy storage circuit 10 is powered by the DC voltage signal line. When there is power at the circuit breaker input terminal, the voltage signal is output to the rectifier bridge circuit via the acquisition terminal (power supply terminal J2) to adjust the current input direction to prevent reverse connection, and then charges the capacitor C1 via the current limiting resistor R4 to complete the energy storage. Capacitor C1 is used as a backup power source when the voltage may be pulled down due to a short circuit. The control power circuit 20 steps down the DC voltage signal to supply power to the subsequent stage. When a short-delay short circuit fault occurs, the dry contact switch J3 closes, and the delay control unit 40 starts the delay. When the set time is reached, the MOSFET Q1 is triggered to conduct, and the trip unit J1 trips. In this embodiment, the delay control unit 40 adopts a comparator method. The four resistor levels R9-R12 are selected through the encoding switch RW1 to control the charging speed of capacitor C5 by VCC. When the voltage division threshold of resistors R8 and R13 is reached, the comparator U1 outputs a trigger signal to the signal input terminal CT_CTRL of the execution unit 30 through the signal output terminal CT_CTRL. The execution unit 30 receives the trigger signal and controls the trip unit J1 to perform the corresponding tripping action. Example 2
[0034] The difference between this embodiment and Embodiment 1 lies in the configuration of the delay control unit. This embodiment provides an alternative delay control unit.
[0035] The delay control unit 40 described in this embodiment includes resistors R15, R16, R17, R18, and R19, an encoding switch RW2, and a microcontroller (MCU). One end of resistors R15, R16, R17, and R18, as well as one connection point of the MCU, are connected to the output terminal VCC of the control power supply circuit 20. The other ends of resistors R15, R16, R17, and R18 are connected one-to-one to the other four connection points of the MCU, and then sequentially connected one-to-one to connection points 1, 2, 4, and 8 of the encoding switch RW2. The two ends of resistor R19 are connected to another connection point of the MCU and the signal input terminal CT_CTRL of the execution unit 30. Connection point C of the encoding switch RW2 is grounded. Using MCU software, four microcontroller I / O pins connected to pull-up resistors R15-R18 (or internal pull-up resistors) are grounded via the encoding switch RW2, enabling U2 (microcontroller MCU) to recognize different delay settings. Then, through software delay, a trigger signal is output from the signal output terminal CT_CTRL to the signal input terminal CT_CTRL of the execution unit 30. The execution unit 30 receives the trigger signal and controls the trip unit J1 to perform the corresponding tripping action.
[0036] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.
[0037] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0038] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.
Claims
1. A DC short-circuit short-delay controller, comprising a trip unit J1, an energy storage circuit, a control power supply circuit, an execution unit, and a delay control unit; the positive input terminal IN1 of the energy storage circuit is connected to the positive output terminal of the power supply terminal J2, and the negative input terminal IN2 of the energy storage circuit is connected to the negative output terminal of the power supply terminal J2; the input terminal of the control power supply circuit is connected to the positive output terminal OUT1 of the energy storage circuit, and the output terminal VCC of the control power supply circuit is connected to the input terminal of the delay control unit; the signal output terminal of the delay control unit is connected to the signal input terminal CT_CTRL of the execution unit; the positive input terminal of the execution unit is connected to the positive output terminal OUT1 of the energy storage circuit, and the negative input terminal of the execution unit is connected to the negative output terminal OUT2 of the energy storage circuit; the two output terminals of the execution unit are respectively connected one-to-one to the two terminals of the trip unit. Its features are: The control power supply circuit includes resistors R2, R3, and R6, capacitors C3 and C4, a Zener diode ZD1, a diode D7, and a transistor Q2. One end of resistor R2 and one end of resistor R3 are both connected to the positive output terminal OUT1 of the energy storage circuit. The other end of resistor R2 is connected to one end of capacitor C4, the negative terminal of Zener diode ZD1, the negative terminal of diode D7, and the base of transistor Q2. The other end of resistor R3 is connected to the collector of transistor Q2. The other end of capacitor C4 and the positive terminal of Zener diode ZD1 are both grounded. The positive terminal of diode D7, the emitter of transistor Q2, the positive terminal of capacitor C3, and one end of resistor R6 are all connected to the output terminal VCC of the control power supply circuit. The negative terminal of capacitor C3 and the other end of resistor R6 are both grounded.
2. The DC short-circuit short-delay controller according to claim 1, characterized in that: The energy storage circuit includes a rectifier bridge circuit, a surge protection circuit PTC1 with three connection points, a capacitor C1, a resistor R4, a diode D4, and a dry contact switch J3. The positive input terminal A1 of the rectifier bridge circuit is connected to the positive input terminal IN1 of the energy storage circuit, the negative input terminal A2 of the rectifier bridge circuit is connected to the negative input terminal IN2 of the energy storage circuit, the positive output terminal B1 of the rectifier bridge circuit is connected to connection point 1 of the surge protection circuit, and the negative output terminal B2 of the rectifier bridge circuit is connected to the third connection point of the surge protection circuit, one end of the resistor R4, the positive terminal of the diode D4, and connection point 1 of the dry contact switch J3 and grounded. Connection point 2 of the surge protection circuit and the positive terminal of the capacitor C1 are both connected to the positive output terminal OUT1 of the energy storage circuit. The negative terminal of the capacitor C1 is connected to the other end of the resistor R4 and the negative terminal of the diode D4. Connection point 2 of the dry contact switch J3 is connected to the negative output terminal OUT2 of the energy storage circuit.
3. The DC short-circuit short-delay controller according to claim 2, characterized in that: The rectifier bridge circuit includes diodes D1, D2, D5, and D6. The anode of diode D1 and the cathode of diode D5 are connected to the positive input terminal A1 of the rectifier bridge circuit. The anode of diode D2 and the cathode of diode D6 are connected to the negative input terminal A2 of the rectifier bridge circuit. The cathodes of diode D1 and D2 are connected to the positive output terminal B1 of the rectifier bridge circuit. The anodes of diode D5 and D6 are connected to the negative output terminal B2 of the rectifier bridge circuit.
4. The DC short-circuit short-delay controller according to claim 2, characterized in that: The surge protection circuit PTC1 includes a positive temperature coefficient thermistor PTC and a varistor RV. One end of the positive temperature coefficient thermistor PTC is connected to terminal 1 of the surge protection circuit, one end of the varistor RV is connected to terminal 3 of the surge protection circuit, and the other ends of the positive temperature coefficient thermistor PTC and the other end of the varistor RV are both connected to terminal 2 of the surge protection circuit.
5. The DC short-circuit short-delay controller according to claim 1, characterized in that: The execution unit includes a diode D3, a resistor R1, a MOSFET Q1, a resistor R5, and a capacitor C2. The positive terminal of the diode D3 is connected to one end of the resistor R1, and the negative terminal of the diode D3 is connected to the positive output terminal OUT1 of the energy storage circuit and the terminal 1 of the trip unit J1. The other end of the resistor R1 and the drain of the MOSFET Q1 are both connected to the terminal 2 of the trip unit J1. One end of the resistor R5, one end of the capacitor C2, and the gate of the MOSFET Q1 are all connected to the signal input terminal CT_CTRL of the execution unit. The other end of the resistor R5, the other end of the capacitor C2, and the source of the MOSFET Q1 are all connected to the negative output terminal OUT2 of the energy storage circuit and grounded.
6. The DC short-circuit short-delay controller according to any one of claims 1-5, characterized in that: The delay control unit includes resistors R7, R8, R9, R10, R11, R12, R13, and R14, an encoding switch RW1, a comparator U1, and a capacitor C5. One end of resistors R7, R8, R9, R10, R11, and R12, as well as terminal 8 of comparator U1, are connected to the output terminal VCC of the control power supply circuit. The other end of resistor R7 and terminal 1 of comparator U1 are connected to the signal input terminal CT of the execution unit. CTRL connection; the other end of resistor R8 and one end of resistor R13 are both connected to terminal 2 of comparator U1; the other ends of resistors R9, R10, R11, and R12 are connected one-to-one to terminals 1, 2, 4, and 8 of encoder switch RW1; terminal C of encoder switch RW1, the positive terminal of capacitor C5, and one end of resistor R14 are all connected to terminal 3 of comparator U1; the other ends of resistor R13, R14, C5, and terminal 4 of comparator U1 are all grounded.
7. The DC short-circuit short-delay controller according to any one of claims 1-5, characterized in that: The delay control unit includes resistors R15, R16, R17, R18, and R19, an encoding switch RW2, and a microcontroller (MCU). One end of resistors R15, R16, R17, and R18, as well as one connection point of the MCU, are connected to the output terminal VCC of the control power supply circuit. The other ends of resistors R15, R16, R17, and R18 are connected one-to-one to four other connection points of the MCU, and then sequentially connected one-to-one to connection points 1, 2, 4, and 8 of the encoding switch RW2. The two ends of resistor R19 are connected to another connection point of the MCU and the signal input terminal CT_CTRL of the execution unit. Connection point C of the encoding switch RW2 is grounded.