CN214412265U - Leakage protection circuit with overvoltage protection - Google Patents
Leakage protection circuit with overvoltage protection Download PDFInfo
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- CN214412265U CN214412265U CN202120067189.1U CN202120067189U CN214412265U CN 214412265 U CN214412265 U CN 214412265U CN 202120067189 U CN202120067189 U CN 202120067189U CN 214412265 U CN214412265 U CN 214412265U
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Abstract
The utility model discloses a leakage protection circuit with overvoltage protection, belonging to the technical field of low-voltage electrical appliances, comprising a power supply, a rectifier module, an overvoltage detection module, a tripping module and a leakage detection module, wherein the overvoltage detection module comprises a bidirectional diode and a voltage division unit, the voltage division unit is composed of at least two voltage division resistors in series, and the two ends of the voltage division unit are connected to the anode and cathode output ends of the rectifier module; the common point of two voltage-dividing resistors in the voltage-dividing unit is connected with one end of a bidirectional diode, and the other end of the bidirectional diode is connected to the control electrode of the switching element; the leakage detection module comprises a current transformer, and the positive output end of the leakage detection module is connected to the control electrode of the switch element. The utility model discloses an adopt electronic components such as resistance, electric capacity, diode to constitute simple structure, stable area overvoltage protection's earth leakage protection circuit, cancelled the chip and reduced the use of electronic components such as resistance, reduce cost, improvement price/performance ratio.
Description
Technical Field
The utility model relates to a low-voltage apparatus technical field especially relates to a take overvoltage protection's earth leakage protection circuit.
Background
In order to ensure the use safety of household appliances, most products in the market at present are provided with a miniature leakage protector with overvoltage protection, and when the household appliance generates leakage or the voltage in a power grid exceeds the rated voltage, the protector can automatically cut off the power supply within a short time (usually tens of milliseconds) so as to ensure the electricity safety.
Chinese patent with patent number CN201620412818.9 discloses a leakage overvoltage protection power plug, including the power end, piezo-resistor, the reset key, the leakage protection circuit, overvoltage crowbar, dropout circuit and test circuit, piezo-resistor's both ends are connected with the power end, the both ends of reset key are connected with piezo-resistor's both ends respectively, the other both ends of reset key are connected with live wire and zero line respectively, leakage protection circuit is passed by live wire and zero line, the dropout circuit is connected with leakage protection circuit, be used for driving the disconnection of reset key when taking place the leakage current and carry out the leakage current protection, overvoltage crowbar is connected with the dropout circuit, be used for carrying out overvoltage protection when the voltage between live wire and the zero line is too high. The circuit of the protector is provided with a large number of electronic components by combining with the attached drawings, so that the cost is high, the size of the protector is large, and the protector is difficult to adapt to the current and future miniaturized design and use requirements.
Based on this, the present application is proposed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a to prior art not enough, the utility model provides a simple structure's earth leakage protection circuit of taking overvoltage protection reduces electronic components's quantity, simplifies the structure, reduces the volume of circuit and final products.
In order to achieve the above object, the leakage protection circuit with overvoltage protection of the present invention has the following structure: the power supply comprises a power supply, a rectifying module, an overvoltage detection module, a tripping module and an electric leakage detection module, wherein the tripping module comprises a switching element and a tripping coil, the tripping coil is connected between the positive pole of the power supply and one input end of the rectifying module in series, and the switching element is connected between the positive pole output end and the negative pole output end of the rectifying module in series in the forward direction;
the overvoltage detection module comprises a bidirectional diode and a voltage division unit, wherein the voltage division unit is formed by connecting at least two voltage division resistors in series, and two ends of the voltage division unit are connected to the anode output end and the cathode output end of the rectification module; the common point of two voltage-dividing resistors in the voltage-dividing unit is connected with one end of a bidirectional diode, and the other end of the bidirectional diode is connected to the control electrode of the switching element;
the leakage detection module comprises a current transformer, and the positive output end of the leakage detection module is connected to the control electrode of the switch element.
In particular, in the above-described embodiments, the "power supply" includes both a power supply source and a power supply connection terminal for connecting to the power supply source. And, forward in "forward series" means that the positive electrode of an electronic device having a positive-negative electrode or an anode-cathode is connected to the positive electrode side of a power source.
Through the technical scheme, the utility model provides an electric leakage detection function and excessive pressure detection function to detect structure output and break off with control release work in same switching element, thereby realize earth leakage protection and overvoltage protection. And, the excessive pressure detection function only can be realized through two divider resistance, so the utility model discloses it is more that whole spare part that uses compares in prior art reduction, when guaranteeing that the function realizes, makes overall structure simple, with low costs.
Secondly, the utility model discloses the divider unit adopts two at least divider resistance, through the divider resistance of ground connection, can effectively stabilize the output voltage who draws forth from this divider unit, has improved the reliability of circuit.
For the reliability of improvement circuit, the utility model discloses further set up as follows: in the voltage division unit, a voltage division resistor connected with the negative electrode output end of the rectification unit at the other end is connected in parallel with a capacitor, and the capacitor is used for filtering, so that the output voltage led out from the voltage division unit is further ensured, and the reliability of the circuit is further improved.
The utility model discloses further set up as follows: the leakage detection module further comprises a voltage stabilizing tube, a pair of capacitors and a pair of resistors, wherein the voltage stabilizing tube and the pair of capacitors are connected between two output ends of the current transformer in parallel, the pair of capacitors are respectively connected between two ends of the two capacitors in series, the capacitors are used for storing energy, the resistors are used for reducing voltage, and when leakage current in a circuit reaches a certain value (exceeds the storage upper limit of the energy storage capacitors and the voltage reduction range of the resistors), the current transformer outputs a high level to trigger the switching element and the tripping coil to be conducted, so that the tripper is tripped.
Among the above-mentioned technical scheme, electric leakage detection module adopts resistance, electric capacity to detect, has cancelled the circuit design who adopts the chip among the prior art, has further simplified the utility model discloses circuit structure. In addition, in the leakage detection module, the two output ends of the current transformer are connected with the resistors in series, and the voltage regulator tube is also used for maintaining voltage stability, so that the leakage detection module not only adapts to the change of the current direction in the current transformer, but also can prevent the voltage output to the switching element from fluctuating to a certain extent, and further improves the reliability of the circuit.
The utility model discloses further set up as follows: and a voltage dependent resistor is connected between the positive electrode and the negative electrode of the power supply before the rectifying unit.
For simplifying structure, reduce cost, the utility model discloses further set up as follows: the switching element is a thyristor.
Ensure the stability of circuit in the time of for simplifying structure, reduce cost, the utility model discloses further set up as follows: the rectifying unit is a bridge type full-wave rectifying circuit.
The utility model has the advantages as follows: the utility model discloses only constitute a simple structure, stable area overvoltage protection's earth leakage protection circuit through electronic components such as resistance, electric capacity, diode, cancelled the chip and reduced the use of electronic components such as resistance, make the cost reduce.
The utility model discloses a design piezo-resistor, filter capacitor and stabilivolt isotructure, improved whole circuit's reliability to this has still improved the price/performance ratio of circuit and product.
Drawings
Fig. 1 is a general schematic diagram of an embodiment of the present invention.
Detailed Description
Embodiment 1 is as shown in fig. 1, the utility model provides a take overvoltage protection's earth leakage protection circuit, including power input L, power input N, rectifier module, overvoltage detection module, dropout module, electric leakage detection module, rectifier module is the bridge type full wave rectifier circuit who comprises diode D1, diode D2, diode D3, diode D4. The tripping module comprises a switching element and a tripper, the tripper is provided with a tripping coil, the tripping coil is connected between a power input end L and a first input end of the bridge type full-wave rectifying circuit in series, and a power input end N is connected with a second input end of the bridge type full-wave rectifying circuit. In the embodiment, in order to simplify the structure and further reduce the cost, the switch element adopts the controllable silicon D7 which is connected in series between the first output end and the second output end of the bridge type full-wave rectification circuit in the forward direction, namely the anode of the controllable silicon D7 is connected with the first output end of the full-wave rectification circuit, and the cathode of the controllable silicon D7 is connected with the second output end of the full-wave rectification circuit.
With reference to fig. 1, in this embodiment, the overvoltage detection module includes a bidirectional transient suppression diode D6, a voltage dividing resistor R5, and a voltage dividing resistor R8, where the voltage dividing resistor R5 and the voltage dividing resistor R8 are connected in series to form a voltage dividing unit: one end of the voltage-dividing resistor R5 is connected with the first output end of the bridge full-wave rectification circuit, the other end of the voltage-dividing resistor R5 is connected with one end of the voltage-dividing resistor R8, the connection position is the common point of the two, and the other end of the voltage-dividing resistor R8 is connected with the second output end of the bridge full-wave rectification circuit. The common point of the voltage dividing resistor R5 and the voltage dividing resistor R8 is connected with the bidirectional transient suppression diode D6 in series and then is connected to the control electrode of the controllable silicon D7.
Thus, when the voltage at the power input terminals L and N is higher than Y1, the voltage at the common point rises and is higher than the turn-on voltage of the diode D6, the diode D6 is turned on and the thyristor D7 is turned on.
The leakage detection module includes a current transformer (omitted from fig. 1, only two connection terminals zct1 and zct2 are shown instead), a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R, and a zener diode D5, where two terminals of the capacitor C2, the resistor R, the zener diode D5, and the capacitor C1 are distributed from right to left in fig. 1 and are connected to the connection terminal zct1 and the connection terminal zct2, that is, the capacitor C1, the capacitor C2, the zener diode D5, and the resistor R are connected in parallel. The anode of the zener diode D5 is connected to the connection terminal zct2, and the cathode of the zener diode D5 is connected to the connection terminal zct1, so that the current flow in the module can be limited while the module has a voltage stabilizing function. The resistor R1 is connected in series between the anode of the zener diode D5 and one end of the capacitor C1, and the resistor R2 is connected in series between the cathode of the zener diode D5 and the other end of the capacitor C1, so that the voltage output to the thyristor D7 by the leakage detection module is reduced in a connecting circuit from the current transformer to the thyristor D7. The resistor R is used for preventing the current transformer from being opened and converting the current in the current transformer into voltage.
Finally, the other end of the capacitor C1 connected with one end of the resistor R2 is connected to the control electrode of the thyristor D7 for controlling the on and off state change of the thyristor D7.
The circuit principle of the embodiment is as follows: the 230V alternating current is connected to the anode of the controlled silicon D7 after being subjected to full-wave rectification by the rectification module, and the cathode of the controlled silicon D7 is grounded. The circuit function is divided into two parts: one part is a leakage detection function, and the other part is an overvoltage detection function.
Electric leakage detection principle: when the leakage current value in the circuit reaches a certain value, the current transformer induces a signal, the thyristor D7 is triggered to be conducted after the signal passes through the voltage stabilizing diode D5, the tripping coil is electrified, and the tripper is tripped.
Overvoltage detection principle: when the voltage in the circuit is higher than a certain value, the rectified voltage is higher than a set value after being divided by the voltage dividing resistor R5 and the voltage dividing resistor R8, and the bidirectional diode D6 is conducted, so that the thyristor D7 is triggered to be conducted to enable the release to be released.
From the above, the circuit provided by the embodiment has the functions of overvoltage and leakage protection, and is simple, good in reliability and high in cost performance.
Example 2 this example differs from example 1 in that: in the voltage dividing unit, the voltage dividing resistor R8 is connected in parallel with the capacitor C9, and the capacitor C9 can play a role in filtering, so that the voltage on the voltage dividing resistor R8 is stabilized, the voltage output of the voltage dividing unit is stabilized, and the reliability of the circuit is improved.
Example 3 this example differs from example 1 in that: and a voltage dependent resistor is connected between the power input end L and the power input end N before the rectifying unit. The varistor resistance can change along with voltage, it is right the utility model discloses take overvoltage protection's earth leakage protection circuit itself carries out overvoltage protection, ensures under overvoltage condition, ensures that the circuit can continue to operate and not destroyed.
Claims (7)
1. The utility model provides a take overvoltage protection's earth leakage protection circuit which characterized in that: the power supply comprises a power supply, a rectifying module, an overvoltage detection module, a tripping module and an electric leakage detection module, wherein the tripping module comprises a switching element and a tripping coil, the tripping coil is connected between the positive pole of the power supply and one input end of the rectifying module in series, and the switching element is connected between the positive pole output end and the negative pole output end of the rectifying module in series in the forward direction;
the overvoltage detection module comprises a bidirectional diode and a voltage division unit, wherein the voltage division unit is formed by connecting at least two voltage division resistors in series, and two ends of the voltage division unit are connected to the anode output end and the cathode output end of the rectification module; the common point of two voltage-dividing resistors in the voltage-dividing unit is connected with one end of a bidirectional diode, and the other end of the bidirectional diode is connected to the control electrode of the switching element;
the leakage detection module comprises a current transformer, and the positive output end of the leakage detection module is connected to the control electrode of the switch element.
2. The earth leakage protection circuit with overvoltage protection as claimed in claim 1 wherein: and in the voltage division unit, a voltage division resistor connected with the negative electrode output end of the rectification module at the other end is connected with a capacitor in parallel.
3. A leakage protection circuit with overvoltage protection as claimed in claim 1 or 2, wherein: the leakage detection module further comprises a voltage stabilizing tube, a pair of capacitors and a pair of resistors, wherein the voltage stabilizing tube and the pair of capacitors are connected between the two output ends of the current transformer in parallel, and the pair of resistors are respectively connected between the two ends of the two capacitors in series.
4. A leakage protection circuit with overvoltage protection as claimed in claim 3 wherein: and a resistor for preventing the circuit from being opened is connected between the output ends of the current transformers.
5. The earth leakage protection circuit with overvoltage protection as claimed in claim 4 wherein: and a piezoresistor is connected between the anode and the cathode of the power supply before the rectifying module.
6. The earth leakage protection circuit with overvoltage protection as claimed in claim 1 wherein: the switching element is a thyristor.
7. The earth leakage protection circuit with overvoltage protection as claimed in claim 1 wherein: the rectification module is a bridge type full-wave rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120067189.1U CN214412265U (en) | 2021-01-12 | 2021-01-12 | Leakage protection circuit with overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120067189.1U CN214412265U (en) | 2021-01-12 | 2021-01-12 | Leakage protection circuit with overvoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214412265U true CN214412265U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120067189.1U Active CN214412265U (en) | 2021-01-12 | 2021-01-12 | Leakage protection circuit with overvoltage protection |
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| Country | Link |
|---|---|
| CN (1) | CN214412265U (en) |
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2021
- 2021-01-12 CN CN202120067189.1U patent/CN214412265U/en active Active
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