CN216355944U - Single-phase under-voltage protector that crosses of high reliability - Google Patents
Single-phase under-voltage protector that crosses of high reliability Download PDFInfo
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- CN216355944U CN216355944U CN202122454034.6U CN202122454034U CN216355944U CN 216355944 U CN216355944 U CN 216355944U CN 202122454034 U CN202122454034 U CN 202122454034U CN 216355944 U CN216355944 U CN 216355944U
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- 230000001012 protector Effects 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000008859 change Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to a high-reliability single-phase over-voltage and under-voltage protector, which comprises a power grid input, a power circuit, a voltage sampling circuit, a zero-crossing detection circuit, a single chip microcomputer system, an indicating circuit, a driving circuit and an execution element, wherein the power grid input is connected with the power circuit; the voltage sampling circuit is used for acquiring a power grid input signal and transmitting the power grid input signal to the single chip microcomputer system as a processing basis of overvoltage and undervoltage; the zero-crossing detection circuit is connected with the power grid input and the single chip microcomputer system, and detects the zero-crossing point of the power grid input voltage as the basis of the time point of the driving signal output by the single chip microcomputer system; the driving circuit is connected with the singlechip system and the execution element, amplifies a driving signal input by the singlechip system and outputs the amplified driving signal to the execution element; according to the utility model, the power grid is additionally detected, so that the executing element is closed near the voltage zero crossing point of the power grid, the electric arc generated when the executing element is closed is reduced, the short-circuit resistance of the product is improved, and the application reliability is increased.
Description
Technical Field
The utility model belongs to the technical field of overvoltage and undervoltage protectors, and particularly relates to a high-reliability single-phase overvoltage and undervoltage protector.
Background
The self-restoring overvoltage and undervoltage protector is mainly used for overvoltage and undervoltage protection in distribution lines, and can automatically cut off the lines when the voltage in the lines exceeds the overvoltage value or the undervoltage value so as to protect electric equipment in the lines from being damaged and switch on the power supply again when the voltage in the lines restores to the normal range.
The existing self-recovery overvoltage and undervoltage protector mainly uses a magnetic latching relay as an executive component to cut off or switch on a circuit, when the circuit is switched on or switched off, a contact of the magnetic latching relay is easy to generate electric arc, but the magnetic latching relay is not provided with an arc extinguishing system, the short-circuit resistance is poor, when the circuit generates short-circuit current, the contact is easy to melt and weld, and the function of automatically switching off the circuit is lost.
Disclosure of Invention
The utility model aims to provide a high-reliability single-phase overvoltage and undervoltage protector, which solves the problems that the existing overvoltage and undervoltage protector has poor short-circuit resistance, is easy to generate contact fusion welding when a circuit has short-circuit current, and loses the function of automatically cutting off the circuit.
In order to achieve the purpose, the utility model provides the following technical scheme:
a high-reliability single-phase over-voltage and under-voltage protector is characterized by comprising a power grid input, a power circuit, a voltage sampling circuit, a zero-crossing detection circuit, a single chip microcomputer system, an indicating circuit, a driving circuit and an execution element; wherein
The power supply circuit is connected with the power grid input, the single chip microcomputer system and the driving circuit and is used for providing a working power supply of the single chip microcomputer system and an output power supply of the driving circuit after the power grid input is processed;
the voltage sampling circuit is connected with the power grid input and the single chip microcomputer system, and is used for acquiring a power grid input signal and transmitting the power grid input signal to the single chip microcomputer system to serve as a processing basis for overvoltage and undervoltage;
the zero-crossing detection circuit is connected with the power grid input and the single chip microcomputer system, and detects the zero-crossing point of the power grid input voltage as the basis of the time point of the driving signal output by the single chip microcomputer system;
the driving circuit is connected with the single chip microcomputer system and the execution element, amplifies a driving signal input by the single chip microcomputer system and outputs the driving signal to the execution element;
the executive component is connected with the driving circuit and is used for switching off and switching on a power grid line according to a signal input by the driving circuit;
the indicating circuit is connected with the single chip microcomputer system and indicates the state of the power input by the power grid according to signals input by the single chip microcomputer system.
The utility model further provides that an L pole and an N pole of the power grid input are subjected to resistance-capacitance voltage reduction through a resistor R1 and a capacitor C1, then rectified by a rectifier bridge D1 and stabilized by a voltage regulator tube Z1 to obtain a driving power supply VDD, the driving power supply VDD is filtered by a diode D2 and a capacitor C2, then voltage transformation is carried out by a three-terminal voltage regulator tube U1, and filtering is carried out by a C3 to obtain a stable voltage VCC, so that the driving power supply VCC can be used by the singlechip system U2.
The utility model further provides that the voltage input by the power grid is rectified by a diode D4, a resistor R5 and a resistor R7 divide the voltage, then the capacitor C4 is subjected to integral charging by the diode D4, and the voltage of the power grid is analyzed by the singlechip microcomputer system U2 through detecting the voltage at two ends of the capacitor C4.
The utility model further provides that the voltage input by the power grid forms half-wave triode Q1 base current through diode D5, resistor R9 and triode Q1, triode Q1 is conducted, voltage at point a is converted from VCC into low level, and the time of the zero crossing point of the power grid voltage is analyzed by the singlechip system U2 according to the change condition of the voltage at point a.
The utility model further provides that when the power is on, the voltage VDD charges the capacitor C6 and the capacitor C7 through the diode D2, when the circuit needs to be connected, a pin 3 of the single chip microcomputer system outputs high voltage, a pin 1 of the single chip microcomputer system outputs low level, the triode Q5, the triode Q6 and the triode Q7 are conducted, the capacitor C7 discharges the executing element K1 in the positive direction, and the executing element K1 is connected with the circuit. When the circuit needs to be cut off, pin 1 of the singlechip system U2 outputs high voltage, pin 3 of the singlechip system outputs low level, the triode Q2, the triode Q3 and the triode Q4 are conducted, the capacitor C6 reversely discharges the executive component K1, and the executive component K1 cuts off the circuit.
The utility model has the advantages that the power grid is additionally detected, so that the executive component is closed near the voltage zero crossing point of the power grid, the electric arc generated by the executive component during closing is reduced, the short-circuit resistance of the product is improved, and the application reliability is improved.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a zero-crossing detection circuit according to an embodiment of the utility model.
Reference numerals;
10. inputting a power grid; 20. a power supply circuit; 30. a voltage sampling circuit; 40. a zero-crossing detection circuit; 50. A single chip system; 60. an indication circuit; 70. a drive circuit; 80. an actuator;
Detailed Description
The following embodiments will be described in detail with reference to the accompanying examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present application can be fully understood and implemented.
As shown in fig. 1-3, the present invention is a high-reliability single-phase over-voltage and under-voltage protector, which comprises a power grid input 10, a power circuit 20, a voltage sampling circuit 30, a zero-crossing detection circuit 40, a single-chip microcomputer system 50, an indication circuit 60, a driving circuit 70 and an execution element 80; wherein
The power circuit 20 is connected to the power grid input, the single chip microcomputer system 50 and the driving circuit 70, and is configured to provide a working power supply of the single chip microcomputer system 50 and an output power supply of the driving circuit 70 after processing the power grid input, specifically, after L-level and N-level of the power grid input 10 are subjected to resistance-capacitance voltage reduction by the resistor R1 and the capacitor C1, the L-level and N-level are rectified by the rectifier bridge D1 and stabilized by the voltage regulator tube Z1 to obtain a driving power supply VDD, and after the driving power supply VDD is filtered by the diode D2 and the capacitor C2, the driving power supply VDD is subjected to voltage transformation by the three-terminal voltage regulator tube U1 and filtered by the three-terminal voltage regulator tube C3 to obtain a stable voltage VCC, so as to provide the single chip microcomputer system U2 for use.
The voltage sampling circuit 30 is connected with the power grid input 10 and the single chip microcomputer system 50, and the voltage sampling circuit 30 is used for acquiring a power grid input 10 signal and transmitting the power grid input 10 signal to the single chip microcomputer system 50 to be used as a processing basis for overvoltage and undervoltage; specifically speaking: the voltage of the power grid input 10 is rectified by a diode D4, the voltage is divided by a resistor R5 and a resistor R7, the capacitor C4 is subjected to integral charging by a diode D4, and the voltage of the power grid is analyzed by the singlechip microcomputer system U2 through detecting the voltage at two ends of the capacitor C4.
The zero-crossing detection circuit 40 is connected with the power grid input 10 and the singlechip system 50, and detects the zero crossing point of the voltage of the power grid input 10 as the basis of the time point of the driving signal output by the singlechip system 50; the voltage of the power grid input 10 forms half-wave triode Q1 base current through a diode D5, a resistor R9 and a triode Q1, the triode Q1 is conducted, the voltage at the point a is converted into low level from VCC, and the time of the zero crossing point of the power grid voltage is analyzed by the singlechip microcomputer system U2 according to the change situation of the voltage at the point a. In this embodiment, the transistor Q1 may be replaced by an optocoupler, as shown in fig. 3.
The driving circuit 70 is connected with the single chip microcomputer system 50 and the execution element 80, amplifies a driving signal input by the single chip microcomputer system 50 and outputs the amplified driving signal to the execution element 80; when the circuit needs to be connected, the pin of the singlechip system 503 outputs high voltage, the pin of the singlechip system 501 outputs low level, the triode Q5, the triode Q6 and the triode Q7 are conducted, the capacitor C7 discharges the actuating element K1 in the forward direction, and the actuating element K1 is connected with the circuit. When the circuit needs to be cut off, pin 1 of the singlechip system U2 outputs high voltage, pin 503 of the singlechip system outputs low level, the triode Q2, the triode Q3 and the triode Q4 are conducted, the capacitor C6 reversely discharges the executive component K1, and the executive component K1 cuts off the circuit.
The actuator 80 is connected to the driving circuit 70, and performs a line switching-off and a line switching-on according to a signal input from the driving circuit 70;
the indicating circuit 60 is connected with the single chip microcomputer system 50 and indicates the power state of the power grid input 10 according to the signal input by the single chip microcomputer system 50.
According to the utility model, the power grid is additionally detected, so that the executing element is closed near the voltage zero crossing point of the power grid, the electric arc generated when the executing element is closed is reduced, the short-circuit resistance of the product is improved, and the application reliability is increased.
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
It is noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
While the foregoing description shows and describes several preferred embodiments of the utility model, it is to be understood, as noted above, that the utility model is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (5)
1. A high-reliability single-phase over-voltage and under-voltage protector is characterized by comprising a power grid input, a power circuit, a voltage sampling circuit, a zero-crossing detection circuit, a single chip microcomputer system, an indicating circuit, a driving circuit and an execution element; wherein
The power supply circuit is connected with the power grid input, the single chip microcomputer system and the driving circuit and is used for providing a working power supply of the single chip microcomputer system and an output power supply of the driving circuit after the power grid input is processed;
the voltage sampling circuit is connected with the power grid input and the single chip microcomputer system, and is used for acquiring a power grid input signal and transmitting the power grid input signal to the single chip microcomputer system to serve as a processing basis for overvoltage and undervoltage;
the zero-crossing detection circuit is connected with the power grid input and the single chip microcomputer system, and detects the zero-crossing point of the power grid input voltage as the basis of the time point of the driving signal output by the single chip microcomputer system;
the driving circuit is connected with the single chip microcomputer system and the execution element, amplifies a driving signal input by the single chip microcomputer system and outputs the driving signal to the execution element;
the executive component is connected with the driving circuit and is used for switching off and switching on a power grid line according to a signal input by the driving circuit;
the indicating circuit is connected with the single chip microcomputer system and indicates the state of the power input by the power grid according to signals input by the single chip microcomputer system.
2. The high-reliability single-phase over-voltage and under-voltage protector according to claim 1, wherein an L pole and an N pole of the power grid input are subjected to resistance-capacitance voltage reduction through a resistor R1 and a capacitor C1, then rectified by a rectifier bridge D1 and stabilized by a voltage regulator tube Z1 to obtain a driving power supply VDD, and the driving power supply VDD is filtered by a diode D2 and a capacitor C2, then transformed by a three-terminal voltage regulator tube U1, and filtered by a C3 to obtain a stable voltage VCC so as to be used by a single chip microcomputer system U2.
3. The high-reliability single-phase over-voltage and under-voltage protector according to claim 1, wherein the voltage of the power grid input is rectified by a diode D4, the voltage of a resistor R5 and a resistor R7 is divided, a capacitor C4 is subjected to integral charging by a diode D4, and the power grid voltage is analyzed by a singlechip system U2 by detecting the voltage at two ends of a capacitor C4.
4. The high-reliability single-phase over-voltage and under-voltage protector as claimed in claim 1, wherein the voltage of the power grid input forms a half-wave triode Q1 base current through a diode D5, a resistor R9 and a triode Q1, the triode Q1 is turned on, the voltage at point a is converted from VCC to low level, and the time of the zero crossing point of the power grid voltage is analyzed by the singlechip system U2 according to the change condition of the voltage at point a.
5. The high-reliability single-phase over-voltage and under-voltage protector as claimed in claim 1, wherein the voltage VDD is charged to the capacitor C6 and the capacitor C7 through the diode D2 when power is on, when the circuit operation needs to be switched on, the pin 3 of the mcu outputs high voltage, the pin 1 of the mcu outputs low level, the transistor Q5, the transistor Q6 and the transistor Q7 are turned on, the capacitor C7 discharges the actuating element K1 in the forward direction, the actuating element K1 switches on the circuit, when the circuit operation needs to be switched off, the pin 1 of the mcu U2 outputs high voltage, the pin 3 of the mcu outputs low level, the transistor Q2, the transistor Q3 and the transistor Q4 are turned on, the capacitor C6 discharges the actuating element K1 in the reverse direction, and the actuating element K1 switches off the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122454034.6U CN216355944U (en) | 2021-10-12 | 2021-10-12 | Single-phase under-voltage protector that crosses of high reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122454034.6U CN216355944U (en) | 2021-10-12 | 2021-10-12 | Single-phase under-voltage protector that crosses of high reliability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216355944U true CN216355944U (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122454034.6U Active CN216355944U (en) | 2021-10-12 | 2021-10-12 | Single-phase under-voltage protector that crosses of high reliability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216355944U (en) |
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2021
- 2021-10-12 CN CN202122454034.6U patent/CN216355944U/en active Active
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Effective date of registration: 20231116 Address after: 325604 Zhiguang Industrial Zone, Liushi Town, Leqing City, Wenzhou City, Zhejiang Province (within People's Electric Appliance Group Co., Ltd.) Patentee after: Zhejiang Outai New Energy Technology Co.,Ltd. Address before: 325600 No. 261, Jingliu Road, Yueqing Economic Development Zone, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: Zhejiang Xiangke Electric Co.,Ltd. |