CN206650580U - A kind of Switching Power Supply start current-limiting control circuit - Google Patents
A kind of Switching Power Supply start current-limiting control circuit Download PDFInfo
- Publication number
- CN206650580U CN206650580U CN201720442212.4U CN201720442212U CN206650580U CN 206650580 U CN206650580 U CN 206650580U CN 201720442212 U CN201720442212 U CN 201720442212U CN 206650580 U CN206650580 U CN 206650580U
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- China
- Prior art keywords
- power supply
- resistance
- control circuit
- circuit
- relay
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Abstract
A kind of Switching Power Supply start current-limiting control circuit is the utility model is related to, including input circuit, accessory power supply and delay control circuit, the input circuit include resistance R and relay J, the resistance R both ends parallel connection relay J normally opened contact；The delay control circuit includes resistance R1, electric capacity C1, diode D1, diode D2, reference power circuit IC and relay J.The Switching Power Supply start current-limiting control circuit provided in above-mentioned technical proposal, for limiting the start dash current of high power switching power supply, input circuit is led directly to when ensureing Switching Power Supply work, and time delay length can be adjusted according to resistance and capacitance.
Description
Technical field
It the utility model is related to field of switch power, and in particular to a kind of Switching Power Supply start current-limiting control circuit.
Background technology
Increasing with Switching Power Supply power, the capacity of the filter capacitor after the electric main rectification of input is very big,
Dash current is very big during start, without restriction to be easy to burn rectifier bridge and switch contact.Lower-powered Switching Power Supply can be
Connected in main road NTC thermistor, although NTC thermistor can limit start dash current, the work electricity of Switching Power Supply
Stream flows through thermistor all the time, causes power attenuation and temperature to raise, because operating current is very big in high power switching power supply,
NTC thermistor is difficult to bear.
Utility model content
The purpose of this utility model, which is to provide one kind, can avoid rushing caused by high power switching power supply starup current is excessive
Hit, and can makes the Switching Power Supply start current-limiting control circuit that input circuit is led directly to during power work.
In order to solve the above technical problems, the utility model employs following technical scheme：A kind of Switching Power Supply start current limliting
Control circuit, including input circuit, accessory power supply and delay control circuit, the delay control circuit include resistance R1, electricity
Hold C1, diode D1, diode D2, reference power circuit IC and relay J, the resistance R1 termination accessory power supply just
Pole, resistance R1 another termination capacitor C1 one end, electric capacity C1 other end ground connection, resistance R1 and electric capacity C1 tie point connect base
Quasi- power circuit IC reference pole, resistance R1 both ends and diode D1 are connected in parallel, and diode D1 negative electrode connects accessory power supply
Positive pole；Reference power circuit IC plus earth, reference power circuit IC negative electrode contact relay J one end, relay J's
Another termination accessory power supply positive pole, relay J both ends parallel diode D2, diode D2 negative electrode connect accessory power supply positive pole.
Further, the input circuit includes resistance R and relay J, the resistance R both ends parallel connection relay J's
Normally opened contact.
Further, the reference power circuit IC uses TL431 voltage-stablizers.
A kind of Switching Power Supply start current-limiting control circuit provided in above-mentioned technical proposal, is inputted in high power switching power supply
Series limiting resistor in circuit, dash current when being started shooting with limitation, by the master of relay after filter capacitor charging terminates
Contact is short-circuit by current-limiting resistance, leads directly to input circuit, so both limits starup current, power supply can be made to flow through at work again
High current.
The beneficial effects of the utility model are：It is simple in construction, low in energy consumption, cost is low, time delay is accurately adjustable, can keep away
Exempt to impact caused by high power switching power supply starup current is excessive, avoid rectifier bridge, switch contact from burning, make power work again
When input circuit lead directly to, to flow through high current；The power supply of the utility model Switching Power Supply current-limiting control circuit is derived from switch simultaneously
The accessory power supply that power supply must have, it is not necessary to power supply is specially set, 6~30V of voltage range is applicable, there is wide applicability.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model Switching Power Supply start current-limiting control circuit.
Embodiment
In order that the purpose of this utility model and advantage are more clearly understood, the utility model is entered with reference to embodiments
Row illustrates.It should be appreciated that following word is only to describe one or more of specific embodiments of the present utility model,
Considered critical is not carried out to the protection domain of the specific request of the utility model.
A kind of technical scheme that the utility model is taken current-limiting control circuit as shown in figure 1, Switching Power Supply is started shooting, including it is defeated
Enter circuit 10, accessory power supply and delay control circuit 20, the delay control circuit 20 includes resistance R1, electric capacity C1, two poles
Pipe D1, diode D2, reference power circuit IC and relay J, the resistance R1 termination accessory power supply positive pole, resistance R1's
Another termination capacitor C1 one end, electric capacity C1 other end ground connection, resistance R1 and electric capacity C1 tie point connect reference power circuit
IC reference pole, resistance R1 both ends and diode D1 are connected in parallel, and diode D1 negative electrode connects the positive pole of accessory power supply；Benchmark
Power circuit IC plus earth, reference power circuit IC negative electrode contact relay J one end, relay J another termination are auxiliary
Positive source, relay J both ends parallel diode D2 are helped, diode D2 negative electrode connects accessory power supply positive pole.
The input circuit 10 includes the normally opened of resistance R and relay J, the resistance R both ends parallel connection relay J and touched
Point.The reference power circuit IC uses TL431 voltage-stablizers.
Operation principle of the present utility model is as follows：The power supply of delay control circuit is derived from the accessory power supply of Switching Power Supply,
While input circuit is connected, accessory power supply obtains electric work, is powered for delay control circuit.Delay control circuit obtain it is electric after electric current
Charged by resistance R1 for electric capacity C1, by 1~2s, when electric capacity C1 voltages are reference power circuit IC reference pole tension rise
During to 2.5V, turned between reference power circuit IC negative electrode and anode, relay J adhesives；When switch disconnects,
Accessory power supply dead electricity, electric capacity C1 are discharged rapidly by diode D1, are ready for delay next time.Diode D2 is used for afterflow,
Avoid during relay J coil blackouts because back-emf punctures reference power circuit IC.
The time delay of delay control circuit determines by resistance R1 resistance and electric capacity C1 capacity, resistance R1 resistance or
Electric capacity C1 capacity more big then time delay is longer, otherwise time delay is shorter, can need to carry out according to time delay length
Adjustment.
In a word, Switching Power Supply start current-limiting control circuit provided by the utility model, simple in construction, time delay accurately may be used
Adjust, power consumption is humble, cost is cheap, it is not necessary to it is special to set power supply to power, there is wide applicability and higher security.
Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not limited to
Above-mentioned embodiment, for those skilled in the art, after content described in the utility model is known,
On the premise of not departing from the utility model principle, some equal conversion can also be made to it and are substituted, these equal conversion and
Replacement also should be regarded as belonging to the scope of protection of the utility model.
Claims (3)
- The current-limiting control circuit 1. a kind of Switching Power Supply is started shooting, including input circuit, accessory power supply and delay control circuit, it is special Sign is：The delay control circuit include resistance R1, electric capacity C1, diode D1, diode D2, reference power circuit IC and after Electrical equipment J, the resistance R1 termination accessory power supply positive pole, resistance R1 another termination capacitor C1 one end, electric capacity C1's is another One end is grounded, and resistance R1 and electric capacity C1 tie point connects reference power circuit IC reference pole, resistance R1 both ends and diode D1 is connected in parallel, and diode D1 negative electrode connects the positive pole of accessory power supply；Reference power circuit IC plus earth, reference power supply electricity Road IC negative electrode contact relay J one end, relay J another termination accessory power supply positive pole, relay J both ends and di- pole Pipe D2, diode D2 negative electrode connect accessory power supply positive pole.
- The current-limiting control circuit 2. Switching Power Supply according to claim 1 is started shooting, it is characterised in that：The input circuit includes Resistance R and relay J, the resistance R both ends parallel connection relay J normally opened contact.
- The current-limiting control circuit 3. Switching Power Supply according to claim 1 is started shooting, it is characterised in that：The reference power circuit IC uses TL431 voltage-stablizers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720442212.4U CN206650580U (en) | 2017-04-25 | 2017-04-25 | A kind of Switching Power Supply start current-limiting control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720442212.4U CN206650580U (en) | 2017-04-25 | 2017-04-25 | A kind of Switching Power Supply start current-limiting control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206650580U true CN206650580U (en) | 2017-11-17 |
Family
ID=60277462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720442212.4U Expired - Fee Related CN206650580U (en) | 2017-04-25 | 2017-04-25 | A kind of Switching Power Supply start current-limiting control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206650580U (en) |
-
2017
- 2017-04-25 CN CN201720442212.4U patent/CN206650580U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20171117 Termination date: 20180425 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |