CN206559225U - Lossless power-on surge suppression circuit - Google Patents
Lossless power-on surge suppression circuit Download PDFInfo
- Publication number
- CN206559225U CN206559225U CN201720065282.2U CN201720065282U CN206559225U CN 206559225 U CN206559225 U CN 206559225U CN 201720065282 U CN201720065282 U CN 201720065282U CN 206559225 U CN206559225 U CN 206559225U
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- CN
- China
- Prior art keywords
- switching tube
- rectifier bridge
- control circuit
- load
- delay control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
- Rectifiers (AREA)
Abstract
The utility model discloses a kind of lossless power-on surge suppression circuit, including the rectifier bridge BD1 being connected with zero line and live wire, the power output end of the rectifier bridge BD1 is in series with load and switching tube Q2, the source electrode of the switching tube Q2 is connected with the load, the grounded drain of the switching tube Q2, the grid of the switching tube Q2 is connected with unlatching delay control circuit, described one end for opening delay control circuit is connected with the power output end of the rectifier bridge BD1, the other end ground connection for opening delay control circuit, the load is parallel with filter capacitor C2；The utility model, to open switching tube Q2, effectively controls start surge pulse electric current by RC conduction time constant；Using the on state characteristic of switching tube, lightly conducting state is in upper electric initial instant switching tube, larger resistance is presented in charging process, in charging process, gradually switching tube is conducted to saturation state, make it that small resistance be presented in circuit loop, to ensure properties of product；The utility model circuit simple and stable, such environmental effects are small, and Surge suppression effect is good, it is ensured that properties of product.
Description
Technical field
The utility model is related to a kind of surge restraint circuit, more particularly to a kind of loss-free power-on surge that prevents
Suppression circuit.
Background technology
Switching Power Supply is zero due to the initial voltage on moment, capacitor is started, and capacitor charging transient can be produced very
Big surge current, frequently can lead to input the phenomenon such as fuse blows or air switch tripping operation, rectifier bridge overcurrent damage.
Have at present and surge is suppressed using the thermistor of negative temperature coefficient.Due to the thermal inertia of thermistor, recover again
High resistant needs the time, therefore for needing the in the case of of connecting quickly again after power cut-off, effect is not had sometimes, restarting is easy
There is surge phenomenon, it is influenced by ambient temperature big.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of the lossless of effective control start surge pulse electric current
Consume power-on surge suppression circuit.
In order to solve the above technical problems, the technical solution of the utility model is：Lossless power-on surge suppression circuit,
The power output end of rectifier bridge BD1, the rectifier bridge BD1 including being connected with zero line and live wire are in series with load and switching tube
Q2, the source electrode of the switching tube Q2 is connected with the load, the grounded drain of the switching tube Q2, the grid of the switching tube Q2
It is connected with unlatching delay control circuit, one end of the unlatching delay control circuit and the power output end of the rectifier bridge BD1
Connection, the other end ground connection for opening delay control circuit, the load is parallel with filter capacitor C2.
As a kind of perferred technical scheme, the unlatching delay control circuit includes being connected in parallel on the switching tube Q2 grids
The power output end of charging capacitor C3, the charging capacitor C3 and the rectifier bridge BD1 between the switching tube Q2 drain electrodes
Between series resistance R4, resistance R5 and resistance R6, the charging capacitor C3 be parallel with voltage-regulator diode D4.
As a kind of perferred technical scheme, it is connected with fuse between the live wire and the rectifier bridge.
By adopting the above-described technical solution, lossless power-on surge suppression circuit, including connect with zero line and live wire
The rectifier bridge BD1, the rectifier bridge BD1 that connect power output end are in series with load and switching tube Q2, the source of the switching tube Q2
Pole is connected with the load, the grounded drain of the switching tube Q2, and the grid of the switching tube Q2 is connected with unlatching delay control
Circuit, one end of the unlatching delay control circuit is connected with the power output end of the rectifier bridge BD1, described to open delay control
The other end ground connection of circuit processed, the load is parallel with filter capacitor C2；The utility model is come by RC conduction time constant
Open switching tube Q2, effectively control start surge pulse electric current；Using the on state characteristic of switching tube, opened in upper electric initial instant
Close pipe and be in lightly conducting state, larger resistance is presented in charging process, in charging process, is gradually conducted to switching tube full
And state, make it that small resistance be presented in circuit loop, to ensure properties of product；The utility model circuit simple and stable, environment
Factor influence is small, and Surge suppression effect is good, it is ensured that properties of product.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
With reference to the accompanying drawings and examples, the utility model is expanded on further.In the following detailed description, only by saying
Bright mode describes some one exemplary embodiments of the present utility model.Undoubtedly, one of ordinary skill in the art can be with
Recognize, can be with a variety of modes to described in the case of without departing from spirit and scope of the present utility model
Embodiment is modified.Therefore, accompanying drawing and description are inherently illustrative, rather than for limiting the protection of claim
Scope.
As shown in figure 1, lossless power-on surge suppression circuit, including the rectifier bridge BD1 being connected with zero line and live wire,
Fuse is connected between the live wire and the rectifier bridge, the power output end of the rectifier bridge BD1 is in series with load and opened
Pipe Q2 is closed, the source electrode of the switching tube Q2 is connected with the load, the grounded drain of the switching tube Q2, the switching tube Q2's
Grid is connected with unlatching delay control circuit, and one end of the unlatching delay control circuit and the power supply of the rectifier bridge BD1 are defeated
Go out end connection, the other end ground connection for opening delay control circuit, the load is parallel with filter capacitor C2.The unlatching is prolonged
Control circuit includes the charging capacitor C3 being connected in parallel between the switching tube Q2 grids and switching tube Q2 drain electrodes late, described to fill
Series resistance R4, resistance R5 and resistance R6, the charging capacitor between electric capacity C3 and the rectifier bridge BD1 power output end
C3 is parallel with voltage-regulator diode D4.
As shown in figure 1, starting moment, circuit loop is filled by resistance R4, resistance R5, resistance R6 to charging capacitor C3
Electricity, when charging capacitor C3 capacitance voltage reaches certain value, switching tube Q2 enters lightly conducting state, and high value shape is presented in it
State, suppresses surge current.Circuit persistently charges to charging capacitor C3, rises to after certain value, switching tube Q2 is fully on, and it is presented
Low-resistance state of value, power-on surge current is suppressed by switching tube Q2 on state characteristic.
The utility model is by RC conduction time constant, and to open switching tube Q2, effectively control start surge pulse is electric
Stream；Using the on state characteristic of switching tube, lightly conducting state is in upper electric initial instant switching tube, is presented in charging process
Larger resistance, in charging process, gradually makes switching tube be conducted to saturation state, makes it that small resistance be presented in circuit loop,
To ensure properties of product；The utility model circuit simple and stable, such environmental effects are small, and Surge suppression effect is good, it is ensured that product
Performance.It can prevent short time restarting from the influence that surge phenomenon is caused to power network, protection circuit device occur.
General principle of the present utility model, principal character and advantage of the present utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification
Simply illustrate principle of the present utility model, on the premise of the utility model spirit and scope are not departed from, the utility model is also
Various changes and modifications are had, these changes and improvements are both fallen within the range of claimed the utility model.The utility model
Claimed scope is by appended claims and its equivalent thereof.
Claims (3)
1. lossless power-on surge suppression circuit, it is characterised in that：Including the rectifier bridge BD1 being connected with zero line and live wire,
The power output end of the rectifier bridge BD1 is in series with load and switching tube Q2, and the source electrode of the switching tube Q2 connects with the load
Connect, the grounded drain of the switching tube Q2, the grid of the switching tube Q2 is connected with unlatching delay control circuit, and the unlatching is prolonged
One end of control circuit is connected with the power output end of the rectifier bridge BD1 late, the other end for opening delay control circuit
Ground connection, the load is parallel with filter capacitor C2.
2. lossless power-on surge suppression circuit as claimed in claim 1, it is characterised in that：It is described to open delay control
Circuit includes the charging capacitor C3 being connected in parallel between the switching tube Q2 grids and switching tube Q2 drain electrodes, the charging capacitor
Series resistance R4, resistance R5 and resistance R6, the charging capacitor C3 are in parallel between C3 and the rectifier bridge BD1 power output end
There is voltage-regulator diode D4.
3. lossless power-on surge suppression circuit as claimed in claim 1 or 2, it is characterised in that：The live wire and institute
State and be connected with fuse between rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720065282.2U CN206559225U (en) | 2017-01-19 | 2017-01-19 | Lossless power-on surge suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720065282.2U CN206559225U (en) | 2017-01-19 | 2017-01-19 | Lossless power-on surge suppression circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206559225U true CN206559225U (en) | 2017-10-13 |
Family
ID=60360029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720065282.2U Expired - Fee Related CN206559225U (en) | 2017-01-19 | 2017-01-19 | Lossless power-on surge suppression circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206559225U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460029A (en) * | 2019-09-05 | 2019-11-15 | 中国科学院长春光学精密机械与物理研究所 | A kind of power supply-distribution system |
-
2017
- 2017-01-19 CN CN201720065282.2U patent/CN206559225U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460029A (en) * | 2019-09-05 | 2019-11-15 | 中国科学院长春光学精密机械与物理研究所 | A kind of power supply-distribution system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171013 Termination date: 20190119 |