CN219554577U - Leakage detection protection device with time delay function - Google Patents
Leakage detection protection device with time delay function Download PDFInfo
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- CN219554577U CN219554577U CN202320008603.0U CN202320008603U CN219554577U CN 219554577 U CN219554577 U CN 219554577U CN 202320008603 U CN202320008603 U CN 202320008603U CN 219554577 U CN219554577 U CN 219554577U
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Abstract
The utility model relates to the technical field of electric control, in particular to a leakage detection protection device with a time delay function, which comprises a power supply circuit, a voltage-reducing rectification circuit, a leakage detection circuit, a time delay adjusting circuit and a silicon controlled switch circuit which are sequentially connected, wherein a leakage induction circuit is arranged between the voltage-reducing rectification circuit and the leakage detection circuit; the power supply circuit comprises a phase line (L) and a zero line (N), and the phase line (L) and the zero line (N) are respectively connected with the step-down rectifying circuit. The device has simple structure, low cost and high detection efficiency, and can achieve the function of delay adjustment by adding the delay adjustment circuit between the leakage detection circuit and the silicon controlled switch circuit, realize long-delay leakage protection and prevent the silicon controlled switch from breakdown damage; in addition, the peripheral circuit of the device is simple, and the production cost can be effectively reduced.
Description
Technical Field
The utility model relates to the technical field of electric control, in particular to a leakage detection protection device with a time delay function.
Background
Along with the popularization of electric automobiles, the popularization of corresponding automobile charging electric appliances brings a lot of convenience to automobiles, but in the process of electricity utilization, the electric leakage phenomenon of the charging equipment possibly occurs due to the defects of the electrical equipment or improper use and other reasons, and the damage is brought to the property and life safety of people, such as: the spark generated by the leakage of the charging pile can cause fire and explosion, and the electric shock can also cause personal injury and death, so the leakage detection of the charging pile is particularly important. In addition, the thyristor switch involved in the existing leakage protection device is easy to break down and damage under the condition of high voltage, and great maintenance cost is caused. At present, can be used to detect the electric leakage and have the device of time delay protect function, most peripheral circuit is complicated, original paper and manufacturing cost are also very high, because the appearance of earth leakage protector is all than less, and reserved space is little, also brings certain puzzlement for the overall arrangement of component.
Therefore, a design scheme with low cost and simple structure is urgently needed.
Disclosure of Invention
The utility model aims to solve the problems of the prior art, and provides a leakage detection protection device with a time delay function, which is used for solving the technical problems that a silicon controlled switch involved in the leakage protection device in the prior art is easy to break down and damage under the condition of high voltage, and a peripheral circuit is complex, and the original and production cost are high.
The above purpose is realized by the following technical scheme:
the leakage detection protection device with the time delay function comprises a power supply circuit, a voltage-reducing rectification circuit, a leakage detection circuit, a time delay adjusting circuit and a silicon controlled switch circuit which are sequentially connected, wherein a leakage induction circuit is arranged between the voltage-reducing rectification circuit and the leakage detection circuit; the power supply circuit comprises a phase line L and a zero line N which are respectively connected with the step-down rectifying circuit; the leakage detection circuit is used for filtering, amplifying and rectifying a received leakage signal to obtain a direct-current voltage, inputting the direct-current voltage to the silicon controlled switch circuit, triggering the conduction between the anode and the cathode of the silicon controlled switch SCR in the silicon controlled switch circuit to enable the electromagnet to be conducted to the ground, forming a loop with the silicon controlled switch SCR, and triggering an external mechanism to break the brake through the tripping coil.
Further, the leakage detection circuit includes a leakage detection chip U1, where the type of the leakage detection chip U1 is a leakage chip G4601, and the leakage detection chip includes a first pin GND, a second pin IN, a third pin VR, a fourth pin TC1, a fifth pin TC2, a sixth pin TTC, a seventh pin LTC, an eighth pin OVP, a ninth pin OS, a tenth pin VDD, an eleventh pin VDDH, a twelfth pin NC, a thirteenth pin NC, and a fourteenth pin HV; the second pin IN and the third pin VR are connected with the leakage inductance circuit, the sixth pin TTC and the seventh pin LTC are respectively connected with the delay adjusting circuit, the ninth pin OS is connected with the silicon controlled switch circuit, and the fourteenth pin HV is connected with the step-down rectifying circuit.
Further, the delay adjusting circuit comprises a fifth capacitor C5 connected with the sixth pin TTC and a sixth capacitor C5 connected with the seventh pin LTC, and the chip delay change is controlled by adjusting the ratio of the fifth capacitor C5 to the sixth capacitor C5.
Further, the buck rectifying circuit comprises a piezoresistor MOV and a bridge rectifying circuit formed by 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 a 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 a 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 a third end of the bridge rectifier circuit, the cathode of the third diode D3 and the cathode of the first diode D1 are connected as a fourth end of the bridge rectifier circuit, one side of the piezoresistor MOV is connected with the power supply circuit, the other side of the piezoresistor MOV is connected with the first end and the third end of the bridge rectifier circuit, and the fourth end of the bridge rectifier circuit is connected with the fourteenth pin HV through a ninth resistor R9.
Further, the leakage inductance circuit comprises a zero sequence current transformer (ZCT), a first resistor R1, a bidirectional diode D6, a second resistor R2, a first capacitor C1 and a second capacitor C2 which are sequentially connected; the zero sequence current transformer ZCT clamps the induced leakage current through the bidirectional diode D6, filters the leakage current through the second capacitor C2, and inputs the leakage current into the second pin IN and the third pin VR of the leakage detection chip U1 after the leakage current is converted by the second resistor R2 and the first resistor R1.
Further, the silicon controlled switch circuit comprises a silicon controlled switch SCR, the cathode of the silicon controlled switch SCR is respectively connected with the voltage reduction rectifying circuit and the leakage detection circuit, and the anode of the silicon controlled switch SCR is connected with the tripping coil.
Further, the circuit further comprises a test button circuit, the test button circuit comprises a test button SW2, one end of the test button SW2 is connected with the leakage inductance circuit through a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15, and the other end of the test button SW is connected with the zero line N of the power supply circuit.
Advantageous effects
The leakage detection protection device with the time delay function converts alternating voltage into direct voltage through the step-down rectifying circuit and transmits the direct voltage to the leakage detection circuit; the leakage signal in the circuit is converted into a voltage signal through a leakage induction circuit and is transmitted to the leakage detection circuit for leakage, the leakage signal is filtered, amplified and rectified to obtain a direct-current voltage, the direct-current voltage is input to the controllable silicon switch, the conduction between the anode and the cathode of the controllable silicon switch is triggered, the electromagnet is conducted to the ground, a loop is formed with the controllable silicon switch, and the tripping coil triggers the external mechanism to break the gate. The device has simple structure, low cost and high detection efficiency, and can achieve the function of delay adjustment by adding the delay adjustment circuit between the leakage detection circuit and the silicon controlled switch circuit, realize long-delay leakage protection and prevent the silicon controlled switch from breakdown damage; in addition, the peripheral circuit of the device is simple, and the production cost can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a leakage detection protection device with a time delay function according to the present utility model;
fig. 2 is a circuit diagram of a leakage detection protection device with a delay function according to the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the figures and examples.
As shown in fig. 1, the leakage detection protection device with the time delay function comprises a power supply circuit, a voltage-reducing rectification circuit, a leakage detection circuit, a time delay adjusting circuit and a silicon controlled switch circuit which are sequentially connected, wherein a leakage induction circuit is arranged between the voltage-reducing rectification circuit and the leakage detection circuit; the power supply circuit comprises a phase line L and a zero line N which are respectively connected with the step-down rectifying circuit; the leakage detection circuit is used for filtering, amplifying and rectifying a received leakage signal to obtain a direct-current voltage, inputting the direct-current voltage to the silicon controlled switch circuit, triggering the conduction between the anode and the cathode of the silicon controlled switch SCR in the silicon controlled switch circuit to enable the electromagnet to be conducted to the ground, forming a loop with the silicon controlled switch SCR, and triggering an external mechanism to break the brake through the tripping coil.
As shown IN fig. 2, the leakage detection circuit IN this embodiment includes a leakage detection chip U1, where the leakage detection chip U1 is a leakage chip G4601, and includes a first pin GND, a second pin IN, a third pin VR, a fourth pin TC1, a fifth pin TC2, a sixth pin TTC, a seventh pin LTC, an eighth pin OVP, a ninth pin OS, a tenth pin VDD, an eleventh pin VDDH, a twelfth pin NC, a thirteenth pin NC, and a fourteenth pin HV; the second pin IN and the third pin VR are connected with the leakage inductance circuit, the sixth pin TTC and the seventh pin LTC are respectively connected with the delay adjusting circuit, the ninth pin OS is connected with the silicon controlled switch circuit, and the fourteenth pin HV is connected with the step-down rectifying circuit.
The delay adjusting circuit comprises a fifth capacitor C5 connected with the sixth pin TTC and a sixth capacitor C5 connected with the seventh pin LTC, and delay adjustment is performed through the sixth pin TTC and the seventh pin LTC of the chip U1, namely, the chip delay change is controlled by adjusting the proportion of the fifth capacitor C5 to the sixth capacitor C5.
The buck rectifying circuit in this embodiment includes a varistor MOV and a bridge rectifying circuit formed by 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 a 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 a 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 a third end of the bridge rectifier circuit, the cathode of the third diode D3 and the cathode of the first diode D1 are connected as a fourth end of the bridge rectifier circuit, one side of the piezoresistor MOV is connected with the power supply circuit, the other side of the piezoresistor MOV is connected with the first end and the third end of the bridge rectifier circuit, and the fourth end of the bridge rectifier circuit is connected with the fourteenth pin HV through a ninth resistor R9.
Specifically, the device adds commercial power between the phase line L and the zero line N of the power supply, and is used for protecting a circuit from high-voltage breakdown by adding the piezoresistor MOV; the stable direct-current voltage is provided for the chip in the leakage detection circuit through the step-down rectifying circuit.
The leakage inductance circuit in this embodiment includes a zero sequence current transformer (ZCT), a first resistor R1, a bidirectional diode D6, a second resistor R2, a first capacitor C1 and a second capacitor C2, which are sequentially connected; the zero sequence current transformer ZCT clamps the induced leakage current through the bidirectional diode D6, filters the leakage current through the second capacitor C2, and inputs the leakage current into the second pin IN and the third pin VR of the leakage detection chip U1 after the leakage current is converted by the second resistor R2 and the first resistor R1.
The leakage detection circuit amplifies, filters, amplifies and rectifies the induced leakage signal to obtain a direct-current voltage, and the direct-current voltage is input to the silicon controlled switch circuit through a ninth pin OS of the leakage detection chip.
The controllable silicon switch circuit comprises a controllable silicon switch SCR, wherein the cathode of the controllable silicon switch SCR is respectively connected with the voltage-reducing rectification circuit and the leakage detection circuit, and the anode of the controllable silicon switch SCR is connected with the tripping coil.
Specifically, when the leakage detection circuit amplifies, filters, amplifies and rectifies the induced leakage signal to obtain a direct-current voltage, and the direct-current voltage is input to the thyristor switch circuit through a ninth pin OS of the leakage detection chip, the conduction between the anode and the cathode of the thyristor switch SCR is triggered, so that a tripping coil in the step-down rectifying circuit is conducted to the ground, a loop is formed with the thyristor switch SCR, and the tripping coil triggers an external mechanism to break the gate.
The device also comprises a test button circuit, wherein the test button circuit comprises a test button SW2, one end of the test button SW2 is connected with the leakage inductance circuit through a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15, and the other end of the test button SW2 is connected with the zero line N of the power supply circuit.
While the utility model has been described with respect to the preferred embodiments, it is to be understood that the utility model is not limited thereto, but is capable of modification and substitution within the spirit and scope of the utility model as will be apparent to those skilled in the art. Therefore, the protection scope of the present utility model should be subject to the claims.
Claims (5)
1. The leakage detection protection device with the time delay function is characterized by comprising a power supply circuit, a voltage-reducing rectification circuit, a leakage detection circuit, a time delay adjusting circuit and a silicon controlled switch circuit which are sequentially connected, wherein a leakage induction circuit is arranged between the voltage-reducing rectification circuit and the leakage detection circuit; the power supply circuit comprises a phase line (L) and a zero line (N), and is respectively connected with the step-down rectifying circuit; the leakage detection circuit is used for filtering, amplifying and rectifying a received leakage signal to obtain a direct-current voltage, inputting the direct-current voltage to the silicon controlled switch circuit, triggering the conduction between the anode and the cathode of a silicon controlled Switch (SCR) in the silicon controlled switch circuit to enable the electromagnet to be conducted to the ground, forming a loop with the silicon controlled Switch (SCR), and triggering an external mechanism to break a gate through a tripping coil;
the leakage detection circuit comprises a leakage detection chip (U1), wherein the type of the leakage detection chip (U1) is a leakage chip G4601, and the leakage detection chip comprises a first pin (GND), a second pin (IN), a third pin (VR), a fourth pin (TC 1), a fifth pin (TC 2), a sixth pin (TTC), a seventh pin (LTC), an eighth pin (OVP), a ninth pin (OS), a tenth pin (VDD), an eleventh pin (VDDH), a twelfth pin (NC), a thirteenth pin (NC) and a fourteenth pin (HV); the second pin (IN) and the third pin (VR) are connected with the leakage inductance circuit, the sixth pin (TTC) and the seventh pin (LTC) are respectively connected with the delay adjustment circuit, the ninth pin (OS) is connected with the silicon controlled switch circuit, and the fourteenth pin (HV) is connected with the buck rectification circuit;
the step-down rectifying circuit comprises a piezoresistor (MOV) and a bridge rectifying circuit formed by a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4); the positive pole of first diode (D1) with the negative pole of second diode (D2) is connected as the first end of bridge rectifier circuit, the positive pole of second diode (D2) with the positive pole of fourth diode (D4) is connected as the second end of bridge rectifier circuit, the negative pole of fourth diode (D4) with the positive pole of third diode (D3) is connected as the third end of bridge rectifier circuit, the negative pole of third diode (D3) with the negative pole of first diode (D1) is connected as the fourth end of bridge rectifier circuit, one side of piezo-resistor (MOV) with power supply circuit is connected, the opposite side respectively with the first end and the third end of bridge rectifier circuit, the fourth end of bridge rectifier circuit is connected with fourteenth pin (HV) through ninth resistance (R9), the resistance of ninth resistance (R9) is 4.7K.
2. The leakage detection protection device with delay function according to claim 1, wherein the delay adjustment circuit comprises a fifth capacitor (C5) connected to the sixth pin (TTC), and a sixth capacitor (C5) connected to the seventh pin (LTC), and wherein the chip delay variation is controlled by adjusting the ratio of the fifth capacitor (C5) to the sixth capacitor (C5).
3. The leakage detection protection device with a time delay function according to claim 1, wherein the leakage inductance circuit comprises a zero sequence current transformer (ZCT), a first resistor (R1), a bidirectional diode (D6), a second resistor (R2), a first capacitor (C1) and a second capacitor (C2) which are sequentially connected; the zero sequence current transformer (ZCT) clamps induced leakage current through the bidirectional diode (D6), filters the leakage current through the second capacitor (C2), and then converts the leakage current through the second resistor (R2) and the first resistor (R1) and then inputs the leakage current into the second pin (IN) and the third pin (VR) of the leakage detection chip (U1).
4. The leakage detection protection device with a time delay function according to claim 1, wherein the silicon controlled switch circuit comprises a silicon controlled Switch (SCR), a cathode of the silicon controlled Switch (SCR) is respectively connected with the step-down rectifying circuit and the leakage detection circuit, and an anode of the silicon controlled Switch (SCR) is connected with the trip coil.
5. The leakage detection protection device with a time delay function according to claim 1, further comprising a test button circuit, wherein the test button circuit comprises a test button (SW 2), one end of the test button (SW 2) is connected to the leakage inductance circuit through a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14) and a fifteenth resistor (R15), and the other end is connected to the zero line (N) of the power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320008603.0U CN219554577U (en) | 2023-01-03 | 2023-01-03 | Leakage detection protection device with time delay function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320008603.0U CN219554577U (en) | 2023-01-03 | 2023-01-03 | Leakage detection protection device with time delay function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219554577U true CN219554577U (en) | 2023-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320008603.0U Active CN219554577U (en) | 2023-01-03 | 2023-01-03 | Leakage detection protection device with time delay function |
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| Country | Link |
|---|---|
| CN (1) | CN219554577U (en) |
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2023
- 2023-01-03 CN CN202320008603.0U patent/CN219554577U/en active Active
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