CN110676801A - Anti-oscillation overvoltage protection circuit - Google Patents
Anti-oscillation overvoltage protection circuit Download PDFInfo
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- CN110676801A CN110676801A CN201910879420.4A CN201910879420A CN110676801A CN 110676801 A CN110676801 A CN 110676801A CN 201910879420 A CN201910879420 A CN 201910879420A CN 110676801 A CN110676801 A CN 110676801A
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- voltage stabilizing
- resistor
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- triode
- protection circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an anti-oscillation overvoltage protection circuit, which is used for a power supply part, wherein the power supply comprises an input port IN _ V and an output port Safety _ V and comprises a primary voltage stabilizing unit, a secondary voltage stabilizing unit, a working unit and a control unit, the primary voltage stabilizing unit is connected with the power input port IN _ V and the secondary voltage stabilizing unit, the working unit and the control unit are sequentially connected, the output end of the control unit is connected with the power output port Safety _ V, and the voltage stabilizing value of the primary voltage stabilizing unit is greater than that of the secondary voltage stabilizing unit. The invention can avoid the phenomenon that the output end of the circuit is continuously switched on and off when the voltage is critical, and can automatically recover the power supply of the power supply after the voltage is reduced to be below the voltage value of the voltage stabilizing diode D2, thereby playing a better protection role for electronic devices.
Description
The technical field is as follows:
the invention belongs to the technical field of power supply protection, and particularly relates to an anti-oscillation overvoltage protection circuit.
Background art:
in the use process of an electronic device, power supply of a power supply plays a crucial role, but overvoltage problems can be caused due to misoperation or other reasons, an overvoltage protection circuit needs to be designed, the traditional overvoltage protection circuit can play a role in protecting a circuit by cutting off the overvoltage protection circuit when the voltage is too high, but when the input voltage is at the critical value of an overvoltage protection component, the oscillation phenomenon that the power output end is continuously switched on and off can occur, and the electronic device is damaged.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The invention content is as follows:
the present invention is directed to providing an anti-surge overvoltage protection circuit that overcomes the above-mentioned deficiencies of the prior art.
IN order to achieve the above object, the present invention provides an anti-oscillation overvoltage protection circuit, which is used for a power supply part of a power supply, wherein the power supply comprises an input port IN _ V and an output port Safety _ V, and comprises a primary voltage stabilization unit, a secondary voltage stabilization unit, a working unit and a control unit, the primary voltage stabilization unit is connected to the input port IN _ V of the power supply and the secondary voltage stabilization unit, the working unit and the control unit are sequentially connected, an output end of the control unit is connected to the output port Safety _ V of the power supply, and a voltage stabilization value of the primary voltage stabilization unit is greater than a voltage stabilization value of the secondary voltage stabilization unit.
The primary voltage stabilizing unit comprises a resistor R1, a resistor R2 and a voltage stabilizing diode D2, two ends of the resistor R1 are respectively connected with a power input port IN _ V and the cathode of the voltage stabilizing diode D2, and the anode of the voltage stabilizing diode D2 is grounded.
The secondary voltage stabilizing unit comprises a resistor R4, a resistor R5, a resistor R6, a voltage stabilizing diode D3 and a triode Q3, one end of the resistor R4 is connected with a resistor R2, the other end of the resistor R4 is connected with a collector c of the triode Q3, one end of the resistor R5 is connected with a base electrode of the triode Q3, the other end of the resistor R5 is connected between the resistor R6 and the anode of the voltage stabilizing diode D3, and emitter e of the resistor R6 and the emitter e of the triode Q3 are grounded.
The working unit comprises a triode Q2 and a voltage stabilizing diode D1, a collector c of the triode Q2 is connected with the anode of the voltage stabilizing diode D1, and an emitter e of the triode Q2 is connected with a power input port IN _ V, a resistor R1 and the cathode of the voltage stabilizing diode D1.
The control unit comprises an MOS tube and a resistor R3, wherein a source electrode S of the MOS tube is connected with a power input port IN _ V and a cathode of a voltage stabilizing diode D1, a grid electrode G of the MOS tube is connected with the resistor R3, a drain electrode D of the MOS tube is connected with a power output port Safety _ V, and the resistor R3 is grounded.
The zener diode D3 has a lower regulated voltage value than the zener diode D2.
The triode Q3 is an NPN type triode.
The triode Q2 is a PNP type triode.
On one hand, the technical scheme of the invention has the following beneficial effects:
the circuit of the invention is designed with a primary voltage stabilizing unit and a secondary voltage stabilizing unit, wherein the voltage stabilizing value of the primary voltage stabilizing unit is larger than that of the secondary voltage stabilizing unit, when the input voltage is higher than the primary voltage stabilizing unit instantly, the circuit is in a disconnected state, when the input voltage fluctuates between the primary voltage stabilizing unit and the secondary voltage stabilizing unit, the circuit is still in the disconnected state, namely when the critical value of the primary voltage stabilizing unit is reached, the circuit is still in the disconnected state, thereby avoiding the phenomenon that the output end of the circuit is continuously switched on and off when the voltage critical value is reached; when the input voltage is reduced to be lower than the voltage stabilizing value of the secondary voltage stabilizing unit, the circuit has a self-recovery power supply function, and can play a better protection role for electronic devices.
Description of the drawings:
FIG. 1 is a schematic diagram of an anti-surge overvoltage protection circuit according to the present invention;
FIG. 2 is a schematic waveform diagram of the anti-surge overvoltage protection circuit according to the present invention;
reference numerals: 1-a primary voltage stabilizing unit, 2-a secondary voltage stabilizing unit, 3-a working unit and 4-a control unit.
The specific implementation mode is as follows:
the following detailed description of specific embodiments of the present invention is provided, but it should be understood that the scope of the present invention is not limited by the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown IN fig. 1, the surge protection circuit is used IN a power supply portion, the power supply includes an input port IN _ V and an output port Safety _ V, and includes a primary voltage stabilizing unit 1, a secondary voltage stabilizing unit 2, a working unit 3, and a control unit 4, the primary voltage stabilizing unit 1 is connected to the power input port IN _ V and the secondary voltage stabilizing unit 2, the working unit 3, and the control unit 4 are sequentially connected, an output port of the control unit 4 is connected to the power output port Safety _ V, and a voltage stabilizing value of the primary voltage stabilizing unit 1 is greater than a voltage stabilizing value of the secondary voltage stabilizing unit 2.
The primary voltage stabilizing unit 1 comprises a resistor R1, a resistor R2 and a voltage stabilizing diode D2, two ends of the resistor R1 are respectively connected with a power input port IN _ V and the cathode of the voltage stabilizing diode D2, and the anode of the voltage stabilizing diode D2 is grounded.
The secondary voltage stabilizing unit 2 comprises a resistor R4, a resistor R5, a resistor R6, a voltage stabilizing diode D3 and a triode Q3, one end of the resistor R4 is connected with the resistor R2, the other end of the resistor R4 is connected with a collector c of the triode Q3, one end of the resistor R5 is connected with a base of the triode Q3, the other end of the resistor R5 is connected between the resistor R6 and the anode of the voltage stabilizing diode D3, and the emitter e of the resistor R6 and the emitter e of the triode Q3 are grounded.
The working unit 3 comprises a triode Q2 and a voltage stabilizing diode D1, a collector c of the triode Q2 is connected with the anode of the voltage stabilizing diode D1, and an emitter e of the triode Q2 is connected with a power input port IN _ V, a resistor R1 and the cathode of the voltage stabilizing diode D1.
The control unit 4 comprises an MOS transistor and a resistor R3, the source S of the MOS transistor is connected to the power input port IN _ V and the cathode of the zener diode D1, the gate G of the MOS transistor is connected to the resistor R3, the drain D of the MOS transistor is connected to the power output port Safety _ V, and the resistor R3 is grounded.
The zener diode D3 has a lower regulated voltage value than the zener diode D2.
The triode Q3 is an NPN type triode, and the triode Q2 is a PNP type triode.
As shown in fig. 2, in an implementation, taking a regulated voltage value of 30V of the zener diode D2 and a regulated voltage value of 27V of the zener diode D3 as an example, when an input voltage is greater than 30V, for example, when the input voltage fluctuates between 30V and 35V, the input voltage exceeds the regulated voltage value of 30V of the zener diode D2 at this time, the zener diode D2 is broken down, a voltage difference is generated between the base b and the emitter e of the transistor Q2, the transistor Q2 is turned on, since the regulated voltage value of the zener diode D3 is 27V, the zener diode D3 is also broken down, the secondary regulator unit 2 and the working unit 3 are both turned on, at this time, the MOS transistor Q1 is turned off, the output voltage of the output port Safety _ V is 0, and the switch is turned;
when the input voltage is reduced from 35V to 27V, particularly when the voltage fluctuates in a 30-27V interval, the voltage stabilizing diode D2 cuts off, but the current is not cut off instantly on a line from the resistor R2 to the triode Q2, the triode Q2 is conducted and breaks down the voltage stabilizing diode D3, the voltage stabilizing diode D3 is conducted by grounding of the resistor R6, the secondary voltage stabilizing unit 2 is conducted to enable the triode Q2 to be in a conduction state all the time, the working unit 3 is also conducted accordingly, at the moment, the MOS tube Q1 cuts off, the output voltage of the output port Safety _ V is still 0, and the switch is disconnected;
when the input voltage is reduced to be lower than 27V, the voltage stabilizing diode D2 and the voltage stabilizing diode D3 are both IN an intercepting state, the triode Q2 and the triode Q3 are not conducted, and the output voltage of the output port Safety _ V is equal to the voltage of the input port IN _ V; at this time, when the voltage rises from below 27V, such as 25V to 30V, the zener diode D3 and the zener diode D2 are still not conducted, the transistor Q2 and the transistor Q3 are not conducted, and the output voltage of the output port Safety _ V is equal to the voltage of the input port IN _ V.
In addition, the voltage stabilizing diode D1 can effectively prevent the reverse connection or short circuit of the circuit, effectively restrain the pressure difference between the source S and the grid G of the MOS tube when the MOS tube is normally opened to work, and prevent the damage of the MOS tube due to the overlarge pressure difference between the source S and the grid G of the MOS tube.
The circuit of the invention is designed with a primary voltage stabilizing unit and a secondary voltage stabilizing unit, wherein the voltage stabilizing value of the primary voltage stabilizing unit is larger than that of the secondary voltage stabilizing unit, when the input voltage is higher than the primary voltage stabilizing unit instantly, the circuit is in a disconnected state, when the input voltage fluctuates between the primary voltage stabilizing unit and the secondary voltage stabilizing unit, the circuit is still in a disconnected state, namely, when the critical value of the primary voltage stabilizing unit is reached, the circuit is still in a disconnected state, thereby avoiding the phenomenon that the output end of the circuit is continuously switched on and off when the voltage critical value is reached; when the input voltage is reduced to be lower than the voltage stabilizing value of the secondary voltage stabilizing unit, the circuit has a self-recovery power supply function, and can play a better protection role for electronic devices.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. The anti-oscillation overvoltage protection circuit is used for a power supply part, the power supply comprises an input port IN _ V and an output port Safety _ V, and the anti-oscillation overvoltage protection circuit is characterized IN that: the voltage stabilizing device comprises a primary voltage stabilizing unit, a secondary voltage stabilizing unit, a working unit and a control unit, wherein the primary voltage stabilizing unit is connected with a power input port IN _ V and the secondary voltage stabilizing unit, the working unit and the control unit are sequentially connected, the output end of the control unit is connected with a power output port Safety _ V, and the voltage stabilizing value of the primary voltage stabilizing unit is greater than that of the secondary voltage stabilizing unit.
2. The surge-resistant overvoltage protection circuit of claim 1, wherein: the primary voltage stabilizing unit comprises a resistor R1, a resistor R2 and a voltage stabilizing diode D2, two ends of the resistor R1 are respectively connected with a power input port IN _ V and the cathode of the voltage stabilizing diode D2, and the anode of the voltage stabilizing diode D2 is grounded.
3. The surge-resistant overvoltage protection circuit of claim 2 wherein: the secondary voltage stabilizing unit comprises a resistor R4, a resistor R5, a resistor R6, a voltage stabilizing diode D3 and a triode Q3, one end of the resistor R4 is connected with a resistor R2, the other end of the resistor R4 is connected with a collector c of the triode Q3, one end of the resistor R5 is connected with a base electrode of the triode Q3, the other end of the resistor R5 is connected between the resistor R6 and the anode of the voltage stabilizing diode D3, and emitter e of the resistor R6 and the emitter e of the triode Q3 are grounded.
4. The surge-resistant overvoltage protection circuit of claim 3, wherein: the working unit comprises a triode Q2 and a voltage stabilizing diode D1, a collector c of the triode Q2 is connected with the anode of the voltage stabilizing diode D1, and an emitter e of the triode Q2 is connected with a power input port IN _ V, a resistor R1 and the cathode of the voltage stabilizing diode D1.
5. The surge-resistant overvoltage protection circuit of claim 4 wherein: the control unit comprises an MOS tube and a resistor R3, wherein a source electrode S of the MOS tube is connected with a power input port IN _ V and a cathode of a voltage stabilizing diode D1, a grid electrode G of the MOS tube is connected with the resistor R3, a drain electrode D of the MOS tube is connected with a power output port Safety _ V, and the resistor R3 is grounded.
6. The surge-resistant overvoltage protection circuit of claim 3, wherein: the zener diode D3 has a lower regulated voltage value than the zener diode D2.
7. The surge-resistant overvoltage protection circuit of claim 3, wherein: the triode Q3 is an NPN type triode.
8. The surge-resistant overvoltage protection circuit of claim 4 wherein: the triode Q2 is a PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910879420.4A CN110676801A (en) | 2019-09-18 | 2019-09-18 | Anti-oscillation overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910879420.4A CN110676801A (en) | 2019-09-18 | 2019-09-18 | Anti-oscillation overvoltage protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110676801A true CN110676801A (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910879420.4A Pending CN110676801A (en) | 2019-09-18 | 2019-09-18 | Anti-oscillation overvoltage protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362500A (en) * | 2021-12-17 | 2022-04-15 | 珠海格力电器股份有限公司 | Voltage stabilization protection device, motor controller and motor |
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2019
- 2019-09-18 CN CN201910879420.4A patent/CN110676801A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362500A (en) * | 2021-12-17 | 2022-04-15 | 珠海格力电器股份有限公司 | Voltage stabilization protection device, motor controller and motor |
| CN114362500B (en) * | 2021-12-17 | 2023-11-24 | 珠海格力电器股份有限公司 | Voltage stabilization protection device, motor controller and motor |
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Address after: No. g1-208, China Sensor Network International Innovation Park, 200 Linghu Avenue, Xinwu District, Wuxi City, Jiangsu Province Applicant after: Wuxi Shengjing Microelectronics Co., Ltd Address before: 214000 Star Incubator on the Second Floor of F11 Building 200 Linghu Avenue, Xinwu District, Wuxi City, Jiangsu Province Applicant before: WUXI SHENGJING ELECTRONIC TECHNOLOGY Co.,Ltd. |
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