High-voltage-resistant electric leakage detection protection device
By incorporating a gas venting pipe and a varistor into the leakage current detection and protection device, combined with a leakage current sensing circuit and a detection chip, the problem of easy damage to the device under high voltage is solved, achieving effective protection against high voltage and ensuring the stability and safety of the device.
Patent Information
- Application Number
- CN202423231690.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing leakage current detection and protection devices are easily damaged in high voltage or high current environments, and cannot effectively protect electrical products and personal safety.
A leakage current detection and protection device was designed, comprising a power supply circuit, a trip unit, a step-down rectifier circuit, a leakage current detection circuit, and a thyristor switch circuit. By adding a gas vent pipe and a varistor at the trip unit, combined with a leakage current sensing circuit and a leakage current detection chip, high voltage detection and protection can be achieved.
It improves the stability and reliability of the device under high voltage environment, prevents damage to the trip unit and products, ensures long-term stable operation, and protects electrical products and personal safety.
Smart Images
Figure CN223744360U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electric control technical field especially relates to a high voltage's leakage protection device of resistance. BACKGROUND
[0002] At present, with the wide application of current converter, switching device and energy-saving equipment in life and production, the leakage protector is easily damaged by excessive voltage in use. Nowadays, in order to solve the problem that the product is damaged and personal safety cannot be protected when the voltage is too high, people need to use a more reliable and stable leakage detection protection device at the power supply to protect personal and property safety. The leakage detection protection device can increase protection at the electromagnet of the circuit prone to damage, so that the product is more stable and safe.
[0003] However, most of the leakage circuits on the market can only work at normal voltage, and when there is excessive voltage or current, damage is prone to occur, and the electrical products and personal safety cannot be protected.
[0004] Therefore, a new technical solution is needed to solve the above technical problems. UTILITY MODEL CONTENT
[0005] The utility model aims at overcoming the problems of the prior art, and provides a leakage detection protection device of resistance to high voltage, which solves the technical problem that most of the leakage circuits in the prior art can only work at normal voltage, and when there is excessive voltage or current, damage is prone to occur, and the electrical products and personal safety cannot be protected.
[0006] The above object is achieved by the following technical scheme:
[0007] A leakage detection protection device of resistance to high voltage, comprising a power supply circuit, a trip unit, a voltage reduction rectifier circuit, a leakage detection circuit and a silicon controlled switch circuit connected in sequence, and further comprising a leakage induction circuit, the leakage induction circuit being connected with the power supply circuit, the voltage reduction rectifier circuit and the leakage detection circuit; the power supply circuit comprises a phase line and a zero line, which are connected with the voltage reduction rectifier circuit respectively; the trip unit comprises a main tap, an auxiliary tap and a separate excitation tap, the main tap is connected with the phase line, the auxiliary tap and the separate excitation tap are connected with the zero line respectively, and the separate excitation tap is further connected with the voltage reduction rectifier circuit; a gas exhaust pipe is further arranged between the main tap and the auxiliary tap, and a pressure sensitive resistor is arranged on the auxiliary tap, and a pressure sensitive resistor is arranged on the separate excitation tap; when the silicon controlled switch circuit is turned on, the silicon controlled switch anode and cathode are turned on, the trip unit is turned on to the ground, and a loop is formed with the silicon controlled switch, and the external mechanism is tripped by the trip coil.
[0008] Further, the voltage reduction rectifier circuit comprises a bridge rectifier circuit composed of a first diode, a second diode, a third diode and a fourth diode; the anode of the first diode and the cathode of the second diode are connected as a first end of the bridge rectifier circuit, the anode of the second diode and the anode of the fourth diode are connected as a second end of the bridge rectifier circuit, the cathode of the fourth diode and the anode of the third diode are connected as a third end of the bridge rectifier circuit, and the cathode of the third diode and the cathode of the first diode are connected as a fourth end of the bridge rectifier circuit; the first end of the bridge rectifier circuit is connected with the split excitation tap, and the fourth end of the bridge rectifier circuit is connected with the leakage detection circuit through a first resistor.
[0009] Further, the silicon controlled switch circuit comprises a silicon controlled switch, the cathode of the silicon controlled switch is connected with the second end of the bridge rectifier circuit, the anode of the silicon controlled switch is connected with the fourth end of the bridge rectifier circuit, and the gate of the silicon controlled switch is connected with the leakage detection circuit.
[0010] Further, the gate of the silicon controlled switch is further provided with a first capacitor.
[0011] Further, the leakage detection circuit comprises a leakage detection chip, the leakage detection chip comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin; the eighth pin is connected with the first resistor; the seventh pin is connected with the gate of the silicon controlled switch; the first pin and the second pin are respectively connected with the leakage sensing circuit.
[0012] Further, the model of the leakage detection chip is M54123L.
[0013] Further, the leakage sensing circuit comprises a zero sequence current transformer, a bidirectional diode, a seventh capacitor, an eighth resistor, a seventh resistor, a second capacitor, a fourth capacitor and a sixth capacitor connected in sequence.
[0014] Further, the model of the bidirectional diode is BAV99.
[0015] Further, the test button circuit is further connected with the power supply circuit and the leakage sensing circuit, and is used for testing the working state of the circuit.
[0016] Further, the test button circuit comprises a test button, one end of the test button is connected with the leakage sensing circuit through a third resistor, and the other end of the test button is connected with the neutral line.
[0017] The utility model provides a kind of leakage detection protection device of high voltage resistance, the device simple structure, using new circuit to detect leakage current, while can prevent too high voltage to break down product.Compared with general leakage detection protection device, the device adds protection device at the tripping device, ensures that tripping device and product are not easily damaged, can stably long-term operation, greatly improve the reliability of product. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is the structural diagram of the leakage detection protection device of high voltage resistance of the utility model described in the utility model;
[0019] Figure 2 It is the circuit diagram of the leakage detection protection device of high voltage resistance of the utility model described in the utility model. DETAILED DESCRIPTION
[0020] The utility model is further explained in detail in connection with drawing and embodiment.
[0021] As Figure 1 And Figure 2 Leakage detection protection device of high voltage resistance, including sequentially connected power supply circuit, tripping device, voltage reducing rectifier circuit, leakage detection circuit and thyristor switch circuit, still including leakage induction circuit, leakage induction circuit with power supply circuit, voltage reducing rectifier circuit and leakage detection circuit are connected;
[0022] The power supply circuit includes phase line L and zero line N, and is connected with the voltage reducing rectifier circuit respectively;
[0023] The tripping device includes main tap, auxiliary tap and shunt excitation tap, the main tap is connected with the phase line L, the auxiliary tap and the shunt excitation tap are connected with the zero line N respectively, and the shunt excitation tap is also connected with the voltage reducing rectifier circuit;
[0024] The main tap and the auxiliary tap are also provided with gas discharge tube TV1, and the auxiliary tap is provided with pressure-sensitive resistor MOV1, and the shunt excitation tap is provided with pressure-sensitive resistor MOV2;
[0025] By increasing gas discharge tube at the main tap and auxiliary tap of tripping device, bypass high voltage, can improve the stability and reliability of tripping device;
[0026] By increasing the pressure-sensitive resistor MOV1 and the pressure-sensitive resistor MOV2, the circuit can be effectively protected from high voltage breakdown;
[0027] When the thyristor switch circuit is turned on, the anode and cathode of the thyristor switch are triggered to be turned on, so that the tripping device is turned on to the ground, and a loop is formed with the thyristor switch, and the external mechanism is triggered to be tripped by the tripping coil.
[0028] When the voltage exceeds the mains, the current loop of the product becomes the loop of the phase line L-gas discharge tube TV1-pressure sensitive resistor MOV1-neutral line N, and does not pass through the main and auxiliary taps of the release, thereby effectively protecting the safety of the release when the voltage is too high.
[0029] As shown in the figure, the voltage reduction rectifier circuit in the embodiment is used to provide stable DC voltage for the leakage detection chip U1 in the leakage detection circuit, and includes a bridge rectifier circuit composed of a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4. Figure 2 Specifically, the anode of the first diode D1 and the cathode of the second diode D2 are connected as the first end of the bridge rectifier circuit, the anode of the second diode D2 and the anode of the fourth diode D4 are connected as the second end of the bridge rectifier circuit, the cathode of the fourth diode D4 and the anode of the third diode D3 are connected as the third end of the bridge rectifier circuit, and the cathode of the third diode D3 and the cathode of the first diode D1 are connected as the fourth end of the bridge rectifier circuit.
[0030] The first end of the bridge rectifier circuit is connected with the split excitation tap, and the fourth end of the bridge rectifier circuit is connected with the leakage detection circuit through the first resistor R1.
[0031] As shown in the figure, the silicon controlled switch circuit in the embodiment includes a silicon controlled switch SCR1, the cathode of the silicon controlled switch SCR1 is connected with the second end of the bridge rectifier circuit, the anode of the silicon controlled switch SCR1 is connected with the fourth end of the bridge rectifier circuit, and the gate of the silicon controlled switch SCR1 is connected with the leakage detection circuit.
[0032] Figure 2 It should be noted that the model of the silicon controlled switch SCR1 in the embodiment is JX014.
[0033] In addition, the gate of the silicon controlled switch SCR1 is further provided with a first capacitor C1 for filtering the ground connection.
[0034] As shown in the figure, the leakage detection circuit in the embodiment includes a leakage detection chip U1, and the leakage detection chip U1 includes a first pin NC, a second pin OPI1, a third pin OPI2, a fourth pin GND, a fifth pin SCRT, a sixth pin DLYC, a seventh pin OP AO and an eighth pin VDD.
[0035] As shown in the figure, the leakage detection circuit in the embodiment includes a leakage detection chip U1, and the leakage detection chip U1 includes a first pin NC, a second pin OPI1, a third pin OPI2, a fourth pin GND, a fifth pin SCRT, a sixth pin DLYC, a seventh pin OP AO and an eighth pin VDD. Figure 2
[0036] The eighth pin VDD is connected with the first resistor R1.
[0037] The seventh pin OPAO is connected with the gate of the silicon controlled switch SCR1.
[0038] The first pin NC and the second pin OPI1 are respectively connected with the leakage current sensing circuit.
[0039] As the peripheral circuit, the fourth pin GND and the fifth pin SCRT are connected with the fifth capacitor C5 and then directly filtered to the ground; and the sixth pin DLYC and the seventh pin OPAO are connected with the third capacitor C3 and then the external trigger signal is stabilized.
[0040] When the leakage detection signal sensed by the leakage detection circuit is amplified, filtered, amplified and rectified to obtain a direct current voltage, the direct current voltage is input to the seventh pin OPAO of the leakage detection chip U1 and input to the silicon controlled switch circuit, the anode and the cathode of the silicon controlled switch SCR1 are triggered to conduct, the trip coil of the tripping device is conducted to the ground, and a loop is formed with the silicon controlled switch SCR1, and the external mechanism is triggered to open by the trip coil.
[0041] The input signal of the seventh pin OPAO of the leakage detection chip U1 at the silicon controlled switch SCR1 is processed and filtered, specifically, the first capacitor C1 is connected to the ground for filtering.
[0042] In the embodiment, the model of the leakage detection chip U1 is M54123L.
[0043] As shown in Figure 2 In the embodiment, the leakage sensing circuit includes a zero sequence current transformer ZCT, a bidirectional diode CR1, a seventh capacitor C7, an eighth resistor R8, a seventh resistor R7, a second capacitor C2, a fourth capacitor C4 and a sixth capacitor C6 connected in sequence.
[0044] The zero sequence current transformer ZCT clamps the sensed leakage current through the bidirectional diode CR1, filters through the seventh capacitor C7, converts through the eighth resistor R8, and inputs to the second pin OPI1 and the third pin OPI2 of the leakage detection chip U1 in the leakage detection circuit.
[0045] Among them, the second capacitor C2, the sixth capacitor C6 and the seventh resistor R7 are connected to the ground for secondary filtering; and the fourth capacitor C4 smooths the signal waveform and removes the noise on the leakage signal to obtain a smoother waveform.
[0046] It should be noted that the model of the bidirectional diode CR1 is BAV99.
[0047] As shown in Figure 2The device also comprises a test button circuit connected with the power supply circuit and the electric leakage induction circuit, for testing the working state of the circuit.
[0048] Specifically, the test button circuit comprises a test button SW2, one end of which is connected with the electric leakage induction circuit through a third resistor R3, and the other end is connected with the neutral line N.
[0049] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can think of changes or substitutions within the technical range disclosed by the present application, which are all covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A leakage detection protection device against high voltage, characterized in that, The power supply circuit, the tripping device, the step-down rectifier circuit, the leakage detection circuit and the silicon controlled switch circuit are sequentially connected, and the leakage induction circuit is connected with the power supply circuit, the step-down rectifier circuit and the leakage detection circuit. The power supply circuit includes a phase line (L) and a zero line (N) connected with the step-down rectifier circuit. The tripping device includes a main tap, an auxiliary tap and a separate excitation tap, the main tap is connected with the phase line (L), the auxiliary tap and the separate excitation tap are connected with the zero line (N), and the separate excitation tap is further connected with the step-down rectifier circuit. The gas exhaust pipe (TV1) is arranged between the main tap and the auxiliary tap, the MOV1 is arranged on the auxiliary tap, and the MOV2 is arranged on the separate excitation tap. When the silicon controlled switch circuit is turned on, the silicon controlled switch anode and cathode are triggered to be turned on, the tripping device is turned on to the ground, and a loop is formed with the silicon controlled switch, so that the external mechanism is triggered to be tripped by the tripping coil.
2. The ground fault detection and protection device of claim 1, wherein, The step-down rectifier circuit includes a bridge rectifier circuit composed of a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4). The anode of the first diode (D1) and the cathode of the second diode (D2) are connected as the first end of the bridge rectifier circuit, the anode of the second diode (D2) and the anode of the fourth diode (D4) are connected as the second end of the bridge rectifier circuit, the cathode of the fourth diode (D4) and the anode of the third diode (D3) are connected as the third end of the bridge rectifier circuit, and the cathode of the third diode (D3) and the cathode of the first diode (D1) are connected as the fourth end of the bridge rectifier circuit. The first end of the bridge rectifier circuit is connected with the separate excitation tap, and the fourth end of the bridge rectifier circuit is connected with the leakage detection circuit through the first resistor (R1).
3. The high-voltage leakage detection and protection device according to claim 2, wherein, The silicon controlled switch circuit includes a silicon controlled switch (SCR1), the cathode of the silicon controlled switch (SCR1) is connected with the second end of the bridge rectifier circuit, the anode of the silicon controlled switch (SCR1) is connected with the fourth end of the bridge rectifier circuit, and the gate of the silicon controlled switch (SCR1) is connected with the leakage detection circuit.
4. The high-voltage leakage detection and protection device according to claim 3, wherein, The gate of the silicon controlled switch (SCR1) is further provided with a first capacitor (C1).
5. The high-voltage leakage detection protection device according to claim 3 or 4, characterized in that, The leakage detection circuit includes a leakage detection chip (U1), and the leakage detection chip (U1) includes a first pin (NC), a second pin (OPI1), a third pin (OPI2), a fourth pin (GND), a fifth pin (SCRT), a sixth pin (DLYC), a seventh pin (OPAO) and an eighth pin (VDD). The eighth pin (VDD) is connected with the first resistor (R1). The seventh pin (OPAO) is connected with the gate of the silicon controlled switch (SCR1). The first pin (NC) and the second pin (OPI1) are connected with the electric leakage sensing circuit respectively.
6. The high-voltage leakage detection and protection device according to claim 5, wherein, The model of the electric leakage detection chip (U1) is M54123L.
7. The high-voltage leakage detection and protection device according to claim 5, wherein, The electric leakage sensing circuit comprises a zero sequence current transformer (ZCT), a bidirectional diode (CR1), a seventh capacitor (C7), an eighth resistor (R8), a seventh resistor (R7), a second capacitor (C2), a fourth capacitor (C4) and a sixth capacitor (C6) connected in sequence.
8. The high-voltage leakage detection and protection device according to claim 7, wherein, The model of the bidirectional diode (CR1) is BAV99.
9. The ground fault circuit interrupter of claim 1, wherein: A test button circuit is further included, which is connected with the power supply circuit and the electric leakage sensing circuit, and is used for testing the working state of the circuit.
10. The ground fault circuit interrupter of claim 9, wherein: The test button circuit comprises a test button (SW2), one end of which is connected with the electric leakage sensing circuit through a third resistor (R3), and the other end is connected with the neutral line (N).