Special surge protection device for preventing voltage breakdown

Abstract

The utility model relates to the technical field of electric control, in particular to a special device for a surge protection device for preventing voltage breakdown, which comprises a power supply circuit, a release, a step-down rectification circuit, an electric leakage detection circuit, a silicon controlled switch circuit and an electric leakage induction circuit, and is characterized in that the power supply circuit comprises a phase line and a zero line which are respectively connected with the step-down rectification circuit; the release comprises a main tap, an auxiliary tap and a shunt tap, the main tap is connected with the phase line, the auxiliary tap is connected with the zero line, and the shunt tap is connected with the step-down rectifying circuit; a gas discharging pipe is arranged between the main tap and the auxiliary tap, and a piezoresistor is arranged at one end of the gas discharging pipe. According to the utility model, the protection device is additionally arranged at the release, so that the release and the product are not easy to damage and can stably run for a long time, and the reliability of the product is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical control technology, and in particular to a special device for surge protectors to prevent voltage breakdown. Background Technology

[0002] Currently, with the widespread application of current converters, switching devices, and energy-saving equipment in daily life and production, residual current devices (RCDs) are easily damaged by excessive voltage during use. To address the issue of products failing to protect personal safety due to excessive voltage, a more reliable and stable leakage current detection and protection device is needed at the power supply point to protect personal and property safety. This leakage current detection and protection device can add protection at the electromagnet of a circuit prone to damage, making the product more stable and safer.

[0003] However, most leakage circuits on the market can only operate under normal voltage. When excessive voltage or current passes through them, they are easily damaged and cannot protect electrical products and personal safety.

[0004] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the problems of the prior art and provide a special device for surge protector to prevent voltage breakdown. This device solves the technical problem that most leakage circuits in the prior art can only work under normal voltage. When excessive voltage or current passes through, they are easily damaged and cannot protect electrical products and personal safety.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A surge protector device for preventing voltage breakdown includes a power supply circuit, a trip unit, a step-down rectifier circuit, a leakage current detection circuit, and a thyristor switch circuit connected in sequence, and also includes a leakage current sensing circuit connected to the power supply circuit, the step-down rectifier circuit, and the leakage current detection circuit. The power supply circuit includes a phase line and a neutral line, which are respectively connected to the step-down rectifier circuit. The trip unit includes a main tap, an auxiliary tap, and a shunt tap. The main tap is connected to the phase line, the auxiliary tap is connected to the neutral line, and the shunt tap is connected to the step-down rectifier circuit. A gas venting pipe is also provided between the main tap and the auxiliary tap, and a varistor is provided at one end of the gas venting pipe. When the thyristor switch circuit is turned on, it triggers the conduction between the anode and cathode of the thyristor switch, causing the trip unit to conduct to ground and forming a circuit with the thyristor switch, triggering an external mechanism to trip through the trip coil.

[0008] Further, the step-down rectifier circuit includes 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 the first terminal of the bridge rectifier circuit, the anode of the second diode and the anode of the fourth diode are connected as the second terminal of the bridge rectifier circuit, the cathode of the fourth diode and the anode of the third diode are connected as the third terminal of the bridge rectifier circuit, and the cathode of the third diode and the cathode of the first diode are connected as the fourth terminal of the bridge rectifier circuit; the first terminal of the bridge rectifier circuit is connected to the shunt tap, and the fourth terminal of the bridge rectifier circuit is connected to the leakage detection circuit via a first resistor.

[0009] Furthermore, the thyristor switch circuit includes a thyristor switch, the cathode of which is connected to the second terminal of the bridge rectifier circuit, the anode of which is connected to the fourth terminal of the bridge rectifier circuit, and the gate of which is connected to the leakage current detection circuit.

[0010] Furthermore, the gate of the thyristor switch is also provided with a fourth capacitor.

[0011] Furthermore, the leakage current detection circuit includes a leakage current detection chip, which includes 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 to the first resistor; the seventh pin is connected to the gate of the thyristor switch; and the first pin and the second pin are respectively connected to the leakage current sensing circuit.

[0012] Furthermore, the leakage current detection chip is model M54123L.

[0013] Furthermore, the leakage current sensing circuit includes a zero-sequence current transformer, a fifth diode, a sixth diode, a seventh diode, an eighth diode, an eighth resistor, a ninth resistor, a tenth resistor, a twelfth resistor, a thirteenth resistor, a first capacitor, a second capacitor, a third capacitor, and an eleventh capacitor connected in sequence.

[0014] Furthermore, the leakage current sensing circuit also includes an inductor, one end of which is connected to the first pin and the second pin of the leakage current detection chip.

[0015] Furthermore, it also includes a test button circuit, which is connected to the power supply circuit and the leakage current sensing circuit, and is used to test the working state of the circuit.

[0016] Furthermore, the test button circuit includes a test button, one end of which is connected to the leakage current sensing circuit through a third resistor, and the other end is connected to the neutral wire.

[0017] This utility model provides a dedicated surge protector device for preventing voltage breakdown. The device has a simple structure and uses a novel circuit to detect leakage current while preventing excessive voltage from damaging the product. Compared to general leakage detection and protection devices, this device incorporates a protective mechanism at the trip unit, ensuring that the trip unit and the product are not easily damaged and can operate stably for a long time, greatly improving product reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a surge protector device for preventing voltage breakdown as described in this utility model;

[0019] Figure 2 This is a circuit diagram of a surge protector device for preventing voltage breakdown as described in this utility model. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the figures and embodiments.

[0021] like Figure 1 As shown, a surge protector device for preventing voltage breakdown includes a power supply circuit, a trip unit, a step-down rectifier circuit, a leakage current detection circuit, and a thyristor switch circuit connected in sequence, and also includes a leakage current sensing circuit, which is connected to the power supply circuit, the step-down rectifier circuit, and the leakage current detection circuit.

[0022] The power supply circuit includes a phase line L and a neutral line N, which are respectively connected to the step-down rectifier circuit;

[0023] The trip unit includes a main tap, an auxiliary tap, and a shunt tap. The main tap is connected to the phase line L, the auxiliary tap is connected to the neutral line N, and the shunt tap is connected to the step-down rectifier circuit. The trip unit can bypass high voltage, improving its stability and reliability.

[0024] A gas venting pipe TV1 is also provided between the main tap and the auxiliary tap, and a varistor MOV1 is provided at one end of the gas venting pipe TV1 to protect the circuit from high voltage breakdown.

[0025] When the thyristor switch circuit is turned on, it triggers the connection between the anode and cathode of the thyristor switch, causing the trip unit to be connected to ground and forming a circuit with the thyristor switch, triggering the external mechanism to open the circuit through the trip coil.

[0026] By providing a gas venting pipe TV1 between the main tap and the auxiliary tap of the trip unit, when the voltage exceeds the mains power, the current loop of the product becomes a loop of phase line L—gas venting pipe TV1—varistor MOV1—neutral line N, without passing through the main tap and auxiliary tap of the trip unit, thus effectively protecting the safety of the trip unit when the voltage is too high.

[0027] like Figure 2 As shown, the step-down rectifier circuit in this embodiment includes a bridge rectifier circuit composed of a first diode 1, a second diode D2, a third diode D3, and a fourth diode D4;

[0028] The anode of the first diode D1 and the cathode of the second diode D2 are connected as the first terminal 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 terminal 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 terminal 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 terminal of the bridge rectifier circuit.

[0029] The first terminal of the bridge rectifier circuit is connected to the shunt tap, and the fourth terminal of the bridge rectifier circuit is connected to the leakage detection circuit via the first resistor R1.

[0030] The thyristor switch circuit described in this embodiment includes a thyristor switch SCR1. The cathode of the thyristor switch SCR1 is connected to the second terminal of the bridge rectifier circuit, the anode of the thyristor switch SCR1 is connected to the fourth terminal of the bridge rectifier circuit, and the gate of the thyristor switch SCR1 is connected to the leakage current detection circuit.

[0031] It should be noted that the model number of the SCR1 thyristor switch described in this embodiment is JX014.

[0032] A fourth capacitor C4 is also provided at the gate of the SCR1 for filtering the connection to ground.

[0033] like Figure 2 As shown, the leakage current detection circuit in this embodiment includes a leakage current detection chip U1, which 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.

[0034] The eighth pin VDD is connected to the first resistor R1;

[0035] The seventh pin OPAO is connected to the gate of the silicon controlled rectifier switch SCR1;

[0036] The first pin NC and the second pin OPI1 are respectively connected to the leakage current sensing circuit;

[0037] As an external circuit, the fourth pin GND and the fifth pin SCRT are directly filtered to ground after being connected to the fifth capacitor C5; the sixth pin DLYC and the seventh pin OPAO are also connected through the sixth capacitor C6 to stabilize the external trigger signal.

[0038] When the leakage current detection circuit amplifies, filters, and rectifies the sensed leakage current signal to obtain a DC voltage, it inputs the voltage to the thyristor switch circuit through the seventh pin OPAO of the leakage current detection chip. This triggers the conduction between the anode and cathode of the thyristor switch SCR1, making the trip coil conduct to ground and forming a circuit with the thyristor switch SCR1. The trip coil then triggers the external mechanism to open the circuit.

[0039] The SCR1 thyristor switch processes and filters the input signal of the seventh pin OPAO of the leakage current detection chip through the fourth capacitor C4.

[0040] The leakage current detection chip U1 is model M54123L.

[0041] like Figure 2 As shown, the leakage current sensing circuit in this embodiment includes a zero-sequence current transformer (ZCT), a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a twelfth resistor R12, a thirteenth resistor R13, a first capacitor C1, a second capacitor C2, a third capacitor C3, and an eleventh capacitor C11 connected in sequence.

[0042] The zero-sequence current transformer ZCT clamps the sensed leakage current through the fifth diode D5, the sixth diode D6, the seventh diode D7, and the eighth diode D8, filters it through the eleventh capacitor C11, converts it through the eighth resistor R8 and the ninth resistor R9, changes the voltage through the tenth resistor R10, and inputs it to the first pin NC and the second pin OPI1 of the leakage current detection chip U2 through the twelfth resistor R12, the thirteenth resistor R13, the first capacitor C1, the second capacitor C2, and the third capacitor C3.

[0043] In addition, the leakage current sensing circuit also includes an inductor L1, one end of which is connected to the first pin NC and the second pin OPI1 of the leakage current detection chip U2.

[0044] In this embodiment, the inductor L1 has the function of smoothing current fluctuations, preventing rapid changes in current, thereby smoothing pulsed or alternating currents; it can also suppress electromagnetic interference (EMI), and has high impedance to high-frequency signals, which can block such signals from passing through, thereby preventing the generation and propagation of EMI.

[0045] like Figure 1 and Figure 2 As shown, as an optimization of this solution, the device also includes a test button circuit, which is connected to the power supply circuit and the leakage current sensing circuit, and is used to test the working state of the circuit.

[0046] Specifically, the test button circuit includes a test button SW2, one end of which is connected to the leakage current sensing circuit through a third resistor R3, and the other end is connected to the neutral line N.

[0047] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this utility model are included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A dedicated device for surge protectors to prevent voltage breakdown, characterized by, The circuit comprises a power supply circuit, a tripping device, a step-down rectifier circuit, a leakage detection circuit and a silicon controlled switch circuit connected in sequence, and further comprises a leakage induction circuit connected with the power supply circuit, the step-down rectifier circuit and the leakage detection circuit. The power supply circuit comprises a phase line (L) and a zero line (N) connected with the step-down rectifier circuit respectively. The tripping device comprises a main tap, an auxiliary tap and a shunt tap, the main tap is connected with the phase line (L), the auxiliary tap is connected with the zero line (N), and the shunt tap is connected with the step-down rectifier circuit. A gas exhaust pipe (TV1) is further arranged between the main tap and the auxiliary tap, and a pressure sensitive resistor (MOV1) is arranged at one end of the gas exhaust pipe (TV1). When the silicon controlled switch circuit is turned on, the silicon controlled switch anode and cathode are triggered to be conductive, the tripping device is conductive to the ground, and a loop is formed with the silicon controlled switch, thereby triggering the external mechanism to open the circuit through the tripping coil.

2. A device for protecting a surge protector from voltage breakdown according to claim 1, wherein The step-down rectifier circuit comprises 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 shunt tap, and the fourth end of the bridge rectifier circuit is connected with the leakage detection circuit through a first resistor (R1).

3. A device for protecting a surge protector from voltage breakdown according to claim 2, wherein The silicon controlled switch circuit comprises 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. A device for protecting a surge protector from voltage breakdown according to claim 3, wherein The gate of the silicon controlled switch (SCR1) is further provided with a fourth capacitor (C4).

5. A device for surge protectors to prevent voltage breakdown according to claim 3 or 4, characterized in that, The leakage detection circuit comprises a leakage detection chip (U1), and the leakage detection chip (U1) comprises 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 respectively connected with the leakage induction circuit.

6. A surge protector specific device to prevent voltage breakdown as defined in claim 5, wherein, The model of the electric leakage detection chip (U1) is M54123L.

7. A surge protector specific device to prevent voltage breakdown as defined in claim 5, wherein, The electric leakage induction circuit comprises a zero sequence current transformer (ZCT), a fifth diode (D5), a sixth diode (D6), a seventh diode (D7), an eighth diode (D8), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), a twelfth resistor (R12), a thirteenth resistor (R13), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3) and an eleventh capacitor (C11) connected in sequence.

8. A device for protecting a surge protector from voltage breakdown according to claim 7, wherein, The electric leakage induction circuit further comprises an inductor (L1), one end of the inductor (L1) being connected with the first pin (NC) and the second pin (OPI1) of the electric leakage detection chip (U2).

9. A surge protector specific device to prevent voltage breakdown as defined in claim 1, wherein, A test button circuit is further included, which is connected with the power supply circuit and the electric leakage induction circuit, and is used for testing the working state of the circuit.

10. A surge protector specific device for preventing voltage breakdown according to claim 9, wherein, The test button circuit comprises a test button (SW2), one end of the test button (SW2) being connected with the electric leakage induction circuit through a third resistor (R3), and the other end being connected with the neutral line (N).

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