CN209592971U - A kind of low quiescent current self-locking protective circuit system - Google Patents
A kind of low quiescent current self-locking protective circuit system Download PDFInfo
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- CN209592971U CN209592971U CN201920622087.4U CN201920622087U CN209592971U CN 209592971 U CN209592971 U CN 209592971U CN 201920622087 U CN201920622087 U CN 201920622087U CN 209592971 U CN209592971 U CN 209592971U
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Abstract
The utility model discloses a kind of low quiescent current self-locking protective circuit system, including continuous input cell, inverter circuit unit, switched on the main circuit between continuous input cell and inverter circuit unit by major loop high-power MOS to control on-off；The first branch and major loop high-power MOS switch in parallel are set on main circuit, and include the auxiliary circuit small-power MOS switch and auxiliary circuit current-limiting resistance being connected in series in the first branch；It is in parallel simultaneously to also set up second branch and the first branch, major loop high-power MOS switch, and then includes the starting switch of series connection, drive circuit unit, control unit, voltage detecting circuit unit in second branch；Drive circuit unit is also electricly connected with auxiliary circuit small-power MOS switch, major loop high-power MOS switch respectively；Control unit is also electricly connected with inverter circuit unit.This scheme can fast implement the cutting of major loop under malfunction, starting when preventing failure, protect electrical equipment, and quiescent dissipation very little.
Description
Technical field
The utility model relates to self-locking protective circuit field, especially a kind of low quiescent current self-locking protective circuit system.
Background technique
With the development of modern industry, in life electrical equipment using more and more, pole is brought to people's lives
The earth is convenient.It is also higher and higher meanwhile for safe and reliable, the energy-saving and environment-friendly requirement of electrical equipment.In industry life,
Switching Power Supply, motor driven application are very wide, and have much been directed to the inverter circuit that direct current delivers stream, and inverter circuit is opened
Close that tube short circuit, upper and lower bridge arm simultaneously turn on, the failures such as successive load short circuit can occur frequently, it is serious to damage input power.
How to cut off circuit in time after the failure occurred, and prevent lower starting of nonserviceabling, is highly important.Meanwhile it reducing quiet
State electric current reduces unnecessary loss and is also necessary.
Summary of the invention
The utility model aim is: providing a kind of low quiescent current self-locking protective circuit system, in inverter circuit or it is negative
When carrying the failures such as generation short circuit, major loop is cut off in time, and prevent from starting under fault state；Circuit static electric current is reduced,
Reduce unnecessary loss.
The technical solution of the utility model is: a kind of low quiescent current self-locking protective circuit system, including direct current input is single
The main circuit that is directly electrically connected with inverter circuit unit of member, on the main circuit between continuous input cell and inverter circuit unit
It is switched by major loop high-power MOS to control on-off.
The first branch and major loop high-power MOS switch in parallel are set on main circuit, and include that series connection connects in the first branch
The auxiliary circuit small-power MOS switch and auxiliary circuit current-limiting resistance connect.
Second branch is also set up outside the first branch, second branch and the first branch, major loop high-power MOS switch are simultaneously
Parallel connection, and in second branch then include be connected in series start switch, drive circuit unit, control unit, voltage detecting circuit
Unit.
Drive circuit unit also switchs automatically controlled company with auxiliary circuit small-power MOS switch, major loop high-power MOS respectively
It connects；Control unit is also electricly connected with inverter circuit unit.
The utility model has the advantages that: this scheme can fast implement the cutting of major loop under malfunction, prevent failure
Shi Qidong, to protect electrical equipment not by abnormal damage, and quiescent dissipation very little.
Detailed description of the invention
The utility model is further described with reference to the accompanying drawings and embodiments:
Fig. 1 is the circuit connection diagram of low quiescent current self-locking protective circuit system；
Wherein: 1, continuous input cell；2, it starts switch；3, auxiliary circuit small-power MOS switch；4, auxiliary circuit current limliting
Resistance；5, major loop high-power MOS switchs；6, drive circuit unit；7, voltage detecting circuit unit；8, control unit；9, inverse
Become circuit unit.
Specific embodiment
The preferred embodiment of the utility model:
A kind of low quiescent current self-locking protective circuit system, including continuous input cell 1 and inverter circuit unit 9 directly electricity
The main circuit of connection passes through major loop high-power MOS on the main circuit between continuous input cell 1 and inverter circuit unit 9
Switch 5 controls on-off.
The first branch is set in parallel with major loop high-power MOS switch 5 on main circuit, and includes that series connection connects in the first branch
The auxiliary circuit small-power MOS switch 3 and auxiliary circuit current-limiting resistance 4 connect.
Second branch is also set up outside the first branch, second branch and the first branch, major loop high-power MOS switch are simultaneously
Parallel connection, and 2, drive circuit unit 6, control unit 8, voltage detecting electricity then are started switch including what is be connected in series in second branch
Road unit 7.
Drive circuit unit 6 is also automatically controlled with auxiliary circuit small-power MOS switch 3, major loop high-power MOS switch 5 respectively
Connection；Control unit 8 is also electricly connected with inverter circuit unit 9.
Therefore, when needing start-up circuit system, 2 are started switch by lower switch, drive circuit unit 6 can drive auxiliary electricity
Road small-power MOS switch 3 is opened, and the uncontrolled unit 8 of drive circuit unit 6 controls at this time；
After auxiliary circuit small-power MOS switch 3 is opened, power supply flows through auxiliary circuit current-limiting resistance 4 and reaches voltage detecting
Suitable direct current is supplied control unit 8 by circuit unit 7, voltage detecting circuit unit 7, opens control unit 8, simultaneously will
The information of voltage detected is sent to control unit 8；
In the case where working properly, control unit 8 controls drive circuit unit 6 and opens major loop high-power MOS switch
5, it is then turned off auxiliary circuit small-power MOS switch 3, then control unit 8 controls inverter circuit unit 9 and works；
If short circuit occurs for inverter circuit unit 9, cause the failures such as under-voltage, voltage detecting circuit unit 7 is immediately detected
Voltage change is simultaneously sent to control unit 8, and control unit 8 issues signal to drive circuit unit 6 immediately and cuts off the big function of major loop
Rate MOS switch 5, circuit stops working；
In the case where failure does not exclude, presses and start switch 2, auxiliary circuit small-power MOS switch 3 is opened, voltage
Detection circuit unit 7 detects that abnormal operating voltage, control unit 8 will not control major loop high-power MOS switch 5, and
For auxiliary circuit because of auxiliary circuit current-limiting resistance 4, electric current will not be very big, causes the damage to DC power supply.Therefore, in unlatching
Before, it is disconnected that circuit is activated switch 2, the auxiliary circuit small-power MOS switch 3 closed, the major loop high-power MOS switch 5 closed
It opens, quiescent current is minimum, is lost also minimum.
In conclusion in the case where a certain switching power inverter switchs tube short circuit, it may appear that high current, if too late
When close supply voltage, input power can be damaged.Above-mentioned circuit design is added in system, both can guarantee circuit
It is normally-open, and it is avoided that failure is damaged, and can guarantee lower starting of not nonserviceabling, moreover it is possible to guarantee quiescent current very little.
The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed of the utility model
All equivalent modifications or change completed under spirit and technical idea, should be covered by the claim of the utility model.
Claims (1)
1. a kind of low quiescent current self-locking protective circuit system, including continuous input cell, inverter circuit unit, feature exist
In: on the main circuit between continuous input cell and inverter circuit unit by major loop high-power MOS switch it is logical to control
It is disconnected；The first branch and the major loop high-power MOS switch in parallel are set on the main circuit, and include series connection in the first branch
The auxiliary circuit small-power MOS switch and auxiliary circuit current-limiting resistance of connection；Also set up second branch and the first branch, major loop
High-power MOS switch is in parallel simultaneously, and in second branch then include be connected in series start switch, drive circuit unit, control
Unit, voltage detecting circuit unit；The drive circuit unit also respectively with the auxiliary circuit small-power MOS switch, lead back
High-power MOS switch in road electricly connects；Described control unit is also electricly connected with the inverter circuit unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920622087.4U CN209592971U (en) | 2019-04-30 | 2019-04-30 | A kind of low quiescent current self-locking protective circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920622087.4U CN209592971U (en) | 2019-04-30 | 2019-04-30 | A kind of low quiescent current self-locking protective circuit system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209592971U true CN209592971U (en) | 2019-11-05 |
Family
ID=68347130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920622087.4U Active CN209592971U (en) | 2019-04-30 | 2019-04-30 | A kind of low quiescent current self-locking protective circuit system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209592971U (en) |
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2019
- 2019-04-30 CN CN201920622087.4U patent/CN209592971U/en active Active
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