CN201378731Y - Overvoltage suppressing and self-recovery circuit - Google Patents
Overvoltage suppressing and self-recovery circuit Download PDFInfo
- Publication number
- CN201378731Y CN201378731Y CN 200920063756 CN200920063756U CN201378731Y CN 201378731 Y CN201378731 Y CN 201378731Y CN 200920063756 CN200920063756 CN 200920063756 CN 200920063756 U CN200920063756 U CN 200920063756U CN 201378731 Y CN201378731 Y CN 201378731Y
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- circuit
- mosfet
- self
- resistance
- overvoltage
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Abstract
The utility model discloses an overvoltage suppressing and self-recovery circuit, which is used for a commercial power input circuit of an electric energy data acquisition terminal. The overvoltage suppressing and self-recovery circuit comprises a surging protective circuit, a full wave rectifying circuit, a filter circuit, a pre-stage voltage sampling circuit, an MOSFET circuit, and a self-recovery feedback circuit, wherein the surging protective circuit, the full wave rectifying circuit and the filter circuit are sequentially connected in series for rectifying and filtering commercial power, and are connected with the pre-stage voltage sampling circuit and the MOSFET circuit; the self-recovery feedback circuit is connected with the MOSFET circuit; and the MOSFET circuit is connected with a power output circuit. The overvoltage suppressing and self-recovery circuit can reliably suppress overvoltage and self-recover the power supply to a post-stage circuit in case of overvoltage of commercial power input, so as to achieve the safe and stable operation of the electric energy data acquisition terminal.
Description
Technical field
The utility model relates to a kind of overvoltage inhibition and self-repairing circuit that is used for the civil power input circuit of data acquisition for electric energy terminal.
Background technology
The power circuit of data acquisition for electric energy terminal is related to the correct collection of stable, the reliability service and the energy data of acquisition terminal.Generally use the civil power input in the acquisition terminal, and utility grid situation instability, voltage fluctuation is frequent and fluctuation range is big, easily causes power consumption equipment to damage.Also only in the civil power input circuit, be provided with surge protection circuit at present for this phenomenon; damage equipment when avoiding being struck by lightning; and the overvoltage that causes for non-thunderbolt; the general protection switch that adopts; this switch sensitivity is lower; sometimes after contact is bonding, can't trip, and need manual closing operation after the tripping operation, therefore still might cause late-class circuit and device damage.
The utility model content
What the purpose of this utility model was to provide a kind of civil power input circuit to the data acquisition for electric energy terminal crosses that pressure energy is reliable to be suppressed and can recover overvoltage inhibition and self-repairing circuit to the late-class circuit power supply automatically.
This overvoltage inhibition and self-repairing circuit that the utility model provides still comprise surge protection circuit, also comprise full-wave rectifying circuit, filter circuit, prime voltage sampling circuit, MOSFET circuit, recover feedback circuit certainly; Wherein order series connection between surge protection circuit, full-wave rectifying circuit, the filter circuit; civil power is carried out rectifying and wave-filtering and is connected with the MOSFET circuit with the prime voltage sampling circuit; be connected with the MOSFET circuit from recovering feedback circuit, the MOSFET circuit connects and is connected with power output circuit.
The utility model is controlled the MOSFET pipe by the prime voltage sampling circuit, under overpressure situation, disconnects MOSFET, the protection late-class circuit; Self-repairing circuit is controlled the MOSFET pipe by feedback circuit, has served as drops to threshold values, connects the MOSFET pipe, and late-class circuit is carried out safe power supply.Therefore the utility model is compared with traditional protection switch and is active in one's movements, and it is reliable that overvoltage suppresses, and can automatically reply late-class circuit is powered.Guaranteed that thus back level data acquisition for electric energy terminating circuit and equipment can not damaged because of the utility grid situation is unstable.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present utility model.
Fig. 2 is the circuit diagram of a kind of execution mode of the utility model.
Embodiment
The utility model is mainly by surge protection circuit, full-wave rectifying circuit, filter circuit, prime voltage sampling circuit, MOSFET circuit with recover several parts of feedback circuit certainly and form as can be seen from Figure 1.Wherein order series connection between surge protection circuit, full-wave rectifying circuit, the filter circuit; civil power is carried out rectifying and wave-filtering and is connected with the MOSFET circuit with the prime voltage sampling circuit; be connected with the MOSFET circuit from recovering feedback circuit, the MOSFET circuit connects and is connected with power output circuit.Output by MOSFET control power supply.The prime voltage sampling circuit is to the input of sampling through over commutation, filtered civil power, and voltage sampling signal inputs to the MOSFET circuit, if overvoltage appears in the civil power input, then variation from low to high appears in voltage sampling signal, will start the shutoff action of MOSFET.From recovering feedback loop when the civil power input is changed to normal range (NR) voltage by overpressure situation, open the MOSFET circuit, recover power supply to late-class circuit.Simultaneously, recover feedback loop certainly and can also protect the MOSFET device.
Fig. 2 has reacted an embodiment of the present utility model:
Full-wave rectifying circuit is realized by rectifier bridge BR1 as can be seen from Figure 2, and the prime voltage sampling circuit is by discharge tube V1, and divider resistance R1, R2, R4, R5, R8, R9, R15, R16, R19, R20, R27, R28, R29, R30 and R34, C5 form.
The MOSFET circuit is by triode V4, metal-oxide-semiconductor V6, and voltage-stabiliser tube V5, resistance R 6, R7, R10, R11, R17, R18, R23, R24 and resistance R 33, capacitor C 4 is formed.Power output circuit is by thermistor R35, and diode V2 and V3 form.
From recovering feedback loop by three resistance R 38, R39, R40, two-way resistance-capacitance circuit (resistance R 36-capacitor C 6, resistance R 37-capacitor C 7) is formed, three resistance, one end is connected in the transistor base of MOSFET circuit, the other end is connected in power output circuit, and two-way group capacitive circuit is in parallel with MOSFET pipe (V6).
When civil power is normally imported, be direct current output through rectifier bridge BR1 rectification, the prime voltage sampling circuit is sampled to direct voltage, because civil power is normal, so voltage-stabiliser tube V1 ends, and sample circuit no current, sampled voltage are low level, thereby triode V4 ends.Direct voltage is input to voltage-stabiliser tube V5 through the resistance string of metal-oxide-semiconductor gate pole, and metal-oxide-semiconductor output is opened in the V5 conducting, and direct voltage is exported by power output circuit.
If civil power input voltage after rectification is higher than the threshold value of voltage-stabiliser tube V1, then prime voltage sampling circuit output high level drags down the metal-oxide-semiconductor gate pole rapidly, and this moment, voltage-stabiliser tube V5 ended, and metal-oxide-semiconductor V6 also is in off state.Overvoltage will can not output to late-class circuit, thereby the protection whole system is not damaged.
Claims (2)
1, a kind of overvoltage inhibition and self-repairing circuit comprise surge protection circuit, it is characterized in that also comprising full-wave rectifying circuit, filter circuit, prime voltage sampling circuit, MOSFET circuit, recover feedback circuit certainly; Wherein order series connection between surge protection circuit, full-wave rectifying circuit, the filter circuit; civil power is carried out rectifying and wave-filtering and is connected with the MOSFET circuit with the prime voltage sampling circuit; be connected with the MOSFET circuit from recovering feedback circuit, the MOSFET circuit connects and is connected with power output circuit.
2, overvoltage inhibition according to claim 1 and self-repairing circuit, it is characterized in that described prime voltage sampling circuit comprises discharge tube (V1) and several dividing resistance that is connected with this pipe and electric capacity (C5), described MOSFET circuit comprise triode (V4) and and at the resistance (R33) at this transistor collector and emission collection two ends, electric capacity (C4), voltage-stabiliser tube (V5), MOSFET pipe (V6) and the some resistance that are connected with this metal-oxide-semiconductor, comprise three resistance (R38 from recovering feedback circuit, R39, R40) and the two-way resistance-capacitance circuit, three resistance, one end is connected in the transistor base of MOSFET circuit, one end is connected in power output circuit, and two-way group capacitive circuit is in parallel with MOSFET pipe (V6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920063756 CN201378731Y (en) | 2009-03-20 | 2009-03-20 | Overvoltage suppressing and self-recovery circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920063756 CN201378731Y (en) | 2009-03-20 | 2009-03-20 | Overvoltage suppressing and self-recovery circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201378731Y true CN201378731Y (en) | 2010-01-06 |
Family
ID=41518851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920063756 Expired - Lifetime CN201378731Y (en) | 2009-03-20 | 2009-03-20 | Overvoltage suppressing and self-recovery circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201378731Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437560A (en) * | 2011-12-20 | 2012-05-02 | 北京控制工程研究所 | Surge current suppression circuit module with recoverable over-current protection function |
| CN103904631A (en) * | 2012-12-31 | 2014-07-02 | 海洋王（东莞）照明科技有限公司 | Protection circuit |
| CN106998149A (en) * | 2017-05-23 | 2017-08-01 | 湖南晟和电子技术有限公司 | Power circuit, method of supplying power to and its measuring instrument being made |
-
2009
- 2009-03-20 CN CN 200920063756 patent/CN201378731Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437560A (en) * | 2011-12-20 | 2012-05-02 | 北京控制工程研究所 | Surge current suppression circuit module with recoverable over-current protection function |
| CN102437560B (en) * | 2011-12-20 | 2014-02-19 | 北京控制工程研究所 | Surge current suppression circuit module with recoverable over-current protection function |
| CN103904631A (en) * | 2012-12-31 | 2014-07-02 | 海洋王（东莞）照明科技有限公司 | Protection circuit |
| CN106998149A (en) * | 2017-05-23 | 2017-08-01 | 湖南晟和电子技术有限公司 | Power circuit, method of supplying power to and its measuring instrument being made |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100106 |
|
| CX01 | Expiry of patent term |