CN209375456U - A kind of novel soft starting circuit - Google Patents
A kind of novel soft starting circuit Download PDFInfo
- Publication number
- CN209375456U CN209375456U CN201920224030.9U CN201920224030U CN209375456U CN 209375456 U CN209375456 U CN 209375456U CN 201920224030 U CN201920224030 U CN 201920224030U CN 209375456 U CN209375456 U CN 209375456U
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- feet
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- rectifier bridge
- soft start
- resistance
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- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model relates to a kind of novel soft starting circuits.1 foot of one end of soft start resistance R1 connects power grid L line in circuit, and 3 feet of relay RLY1 are connected simultaneously, 1 foot of one end of 2 foot of the other end connection thermistor R2 of soft start resistance R1,2 feet of 2 foot of the other end connection relay RLY1 of thermistor R2, and 3 feet of rectifier bridge B1 are connected simultaneously, 2 feet of rectifier bridge B1 are directly connected to power grid N line, and 1 foot of rectifier bridge B1 is connected with 1 foot of DC bus filter capacitor C1, and 4 feet of rectifier bridge B1 are connected with 2 feet of DC bus filter capacitor C1.The utility model has prevented or has reduced the module probability on fire and on fire because of soft start resistance.
Description
Technical field
The utility model relates to circuit field more particularly to a kind of novel soft starting circuits.
Background technique
Currently, existing power supply soft starting circuit, can limit the dash current of input, but work as power module internal fault
When, it is easy to cause because input soft start resistor power is big and on fire, to cause fire.
Utility model content
The purpose of this utility model is to provide a kind of novel soft starting circuits, to solve the above technical problems.
The utility model is using following technical scheme to achieve the above object: a kind of novel soft starting circuit, soft in circuit
1 foot of one end of start-up resistor R1 connects power grid L line, and connects 3 feet of relay RLY1 simultaneously, the other end of soft start resistance R1
2 feet connect 1 foot of one end of thermistor R2,2 feet of 2 foot of the other end connection relay RLY1 of thermistor R2, and connect simultaneously
3 feet of rectifier bridge B1 are connect, 2 feet of rectifier bridge B1 are directly connected to power grid N line, 1 foot and DC bus filter capacitor of rectifier bridge B1
1 foot of C1 is connected, and 4 feet of rectifier bridge B1 are connected with 2 feet of DC bus filter capacitor C1.
Preferably, thermistor R2 is PTC thermistor.
Compared with prior art, the utility model has the advantage that the utility model using (multiple) PTC temperature-sensitive
Resistance connects to reach when internal fault leads to PTC thermistor and soft start resistance string with (multiple) soft start resistance
Connection branch instantaneous power is big, and the resistance value of PTC thermistor is because of positive temperature coefficient, so that resistance quickly becomes larger, thus fast prompt drop
The electric current of low PTC thermistor and soft start resistance series arm, so that the power of soft start resistance, which is limited in it, to be connect
By in the range of.To prevent or reduce the module probability on fire and on fire because of soft start resistance.
Detailed description of the invention
Fig. 1 is the utility model circuit theory schematic diagram.
Specific embodiment
The utility model is further elaborated in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, a kind of novel soft starting circuit, 1 foot of one end of soft start resistance R1 connects power grid L line in circuit,
And 3 feet of relay RLY1 are connected simultaneously, and 1 foot of one end of 2 foot of the other end connection thermistor R2 of soft start resistance R1, temperature-sensitive
2 feet of 2 foot of the other end connection relay RLY1 of resistance R2, and 3 feet of rectifier bridge B1 are connected simultaneously, 2 feet of rectifier bridge B1 are straight
Get access to grid N line in succession, and 1 foot of rectifier bridge B1 is connected with 1 foot of DC bus filter capacitor C1,4 feet and direct current of rectifier bridge B1
2 feet of bus filter capacitor C1 are connected.
Circuit operation principle of the present invention: R1 is soft start resistance, is connected in same branch with thermistor R2, RLY1
For power relay, after it and R1, R2 branch circuit parallel connection, seals in exchange L line, then by rectifier bridge B1, exchange is become straight
Stream, C1 are DC bus energy storage filter capacitor.Soft start principle: when module just accesses alternating current, relay is open circuit, this
When electric current by R1, R2, rectified bridge B1 gives bus capacitor C1 charging, and such electric current would not be big, to give bus capacitor C1
It causes to impact.When bus capacitor C1 is full of, it is closed RLY1, with regard to basic non-impact current.
If in start-up course, C1 short circuit, and there is no thermistor R2, then input voltage will all be added in R1 soft start
On resistance, such R1 will generate heat blow or generate heat it is on fire, it is on fire so as to cause power module.
If in start-up course, C1 is short-circuit, PTC thermistor R2 is sealed in soft start resistance R1 branch, then input electricity
Pressure will be all added on R1 and R2, and PTC thermistor R2 can be brought rapidly up and resistance becomes larger rapidly because power is excessive at this time, this
The resistance of sample soft start resistance branch also just becomes larger rapidly to reduce the electric current of this branch, the power of soft start resistance R1
Just become smaller, its power designs in its specified power, soft start resistance R1 would not be damaged, to will not cause to catch fire.
The above is the utility model preferred embodiment, for the ordinary skill in the art, according to this reality
With novel introduction, in the case where not departing from the principles of the present invention and spirit, the change that is carried out to embodiment is repaired
Change, replacement and variant is still fallen within the protection scope of the utility model.
Claims (2)
1. a kind of novel soft starting circuit, which is characterized in that 1 foot of one end of soft start resistance R1 connects power grid L line in circuit, and
3 feet of relay RLY1,1 foot of one end of 2 foot of the other end connection thermistor R2 of soft start resistance R1, temperature-sensitive electricity are connected simultaneously
2 feet of 2 foot of the other end connection relay RLY1 of R2 are hindered, and connect 3 feet of rectifier bridge B1 simultaneously, 2 feet of rectifier bridge B1 are direct
Power grid N line is connected, 1 foot of rectifier bridge B1 is connected with 1 foot of DC bus filter capacitor C1, and 4 feet and direct current of rectifier bridge B1 are female
2 feet of line filter capacitor C1 are connected.
2. a kind of novel soft starting circuit according to claim 1, which is characterized in that thermistor R2 is PTC temperature-sensitive electricity
Resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920224030.9U CN209375456U (en) | 2019-02-22 | 2019-02-22 | A kind of novel soft starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920224030.9U CN209375456U (en) | 2019-02-22 | 2019-02-22 | A kind of novel soft starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209375456U true CN209375456U (en) | 2019-09-10 |
Family
ID=67827346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920224030.9U Active CN209375456U (en) | 2019-02-22 | 2019-02-22 | A kind of novel soft starting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209375456U (en) |
-
2019
- 2019-02-22 CN CN201920224030.9U patent/CN209375456U/en active Active
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| GR01 | Patent grant |