CN203406605U - Control circuit for inhibiting surge current - Google Patents
Control circuit for inhibiting surge current Download PDFInfo
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- CN203406605U CN203406605U CN201320494430.4U CN201320494430U CN203406605U CN 203406605 U CN203406605 U CN 203406605U CN 201320494430 U CN201320494430 U CN 201320494430U CN 203406605 U CN203406605 U CN 203406605U
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- surge current
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Abstract
The utility model discloses a control circuit for inhibiting the surge current, which comprises a pre-posed filter circuit connected with an AC power supply, and a rectifying control circuit. The rectifying control circuit is at least composed of a rectifier bridge circuit, a filtering capacitor C2 connected with the output end of the rectifying control circuit, a current-limiting resistor R2 connected between the output end of the pre-posed filter circuit and the output end of a rectifier circuit DR, a voltage sampling circuit connected with the output end of the rectifying control circuit, and a relay control circuit connected with the voltage sampling circuit. The control end of the relay control circuit is connected with one end of the coil of a relay K. The other end of the coil of the relay K is grounded. One set of normally open contacts of the relay is respectively connected with the two ends of the current-limiting resistor R2. According to the technical scheme of the utility model, the shock of the large surge current generated during the conventional instant startup of electronic equipment and the interference of the large surge current on the power grid can be effectively reduced. Meanwhile, the control circuit has the advantages of simple structure, lower implementation cost and high reliability.
Description
Technical field
The utility model relates to a kind of control circuit, especially relates to a kind of control circuit for surge current suppression.
Background technology
Surge current refers to power connection moment, flows into the peak current of electronic equipment.Because input filter capacitor charges rapidly, so this peak current is far longer than the input current of stable state, this surge current has not only shortened the life-span of filter capacitor, while is the rectifier bridge to rectification circuit also, fuse has greater impact, also destroy grid supply quality, produce the power consumption equipment of the serious same electrical network of electromagnetic interference influence.
In order to eliminate the surge of power connection moment generation, the method for existing traditional surge current suppression is the thermistor that is connected in series the negative temperature coefficient of an appropriate power type before rectification circuit.Be illustrated in figure 1 the control circuit of a surge current suppression of prior art, comprise the pre-filtering circuit 10 and the rectifier control circuit 20 that are connected with AC power, rectifier control circuit 20 at least comprises rectifier circuit DR and is connected to the filter capacitor C2 of rectifier control circuit 20 output VOUT+, and the thermistor RT1 that is connected in series a negative temperature coefficient between the output of pre-filtering circuit 10 and the input of the rectifier circuit DR of rectifier control circuit 20 carrys out surge current suppression.
There is following shortcoming in prior art: the thermistor RT1 of this power-type under normal conditions its resistance is larger, power connection moment, thermistor RT1 has limited the charging current to filter capacitor C2, thereby suppressed surge current, and after thermistor RT1 heating, its resistance is diminished, to reduce the power consumption of resistance self and the impact of reduction circuit; Therefore, existing serial connection thermistor RT1 is only suitable for low power power circuit, large power, electrically source circuit just needs a plurality of parallel connections and series connection to use, at large power, electrically source circuit good surge current suppression all often, at power cut-off or re-power, thermistor is uncolled and resistance is less, and the surge current producing this time will be very large, inhibitory action is very little, loses inhibitory action even completely.
Utility model content
For overcoming the defect of prior art, the utility model proposes a kind of control circuit for surge current suppression, can effectively solve electronic equipment routine and start surge heavy current impact and the effectively interference of reduction to electrical network that moment produces.
The utility model adopts following technical scheme to realize: a kind of control circuit for surge current suppression, comprise the pre-filtering circuit and the rectifier control circuit that are connected with AC power, this rectifier control circuit at least comprises rectifier circuit and is connected to the filter capacitor C2 of rectifier control circuit output; Be connected to the output of pre-filtering circuit and the current-limiting resistance R2 between rectification circuit DR input, be connected to the voltage sample circuit of rectifier control circuit output, be connected to the control relay circuit of voltage sample circuit, the control end of this control relay circuit connects coil one end of relay K, and the other end ground connection of the coil of relay K, and one group of normally opened contact of relay K is connected to the two ends of current-limiting resistance R2.
Wherein, voltage sample circuit comprises at least 2 resistance that are serially connected between rectifier control circuit output and ground.
Wherein, voltage sample circuit comprises resistance R 1, resistance R 2, resistance R 3 and the resistance R 4 being serially connected in successively between rectifier control circuit output and ground, and resistance R 3 is connected control relay circuit with the common port of resistance R 4.
Wherein, voltage sample circuit also comprises the filter capacitor C3 in parallel with resistance R 4.
Wherein, control relay circuit comprises: the three end adjustable shunt reference source IC1 that are connected with the output of voltage sample circuit with reference to the utmost point, the plus earth of this three ends adjustable shunt reference source IC1, negative electrode connect the grid of a transistor Q2, and the emitter of this transistor Q2 is connected with external power source, coil one end of collector connection relay K.
Wherein, transistor Q2 is PMOS transistor.
Wherein, between the coil two ends of relay K, connect diode D2, the plus earth of this diode D2.
Compared with prior art, the utlity model has following beneficial effect:
The utility model can effectively solve that electronic equipment is conventional to be started the surge heavy current impact that moment produces and effectively reduce the interference to electrical network, has advantages of that circuit structure is simple, realizes that cost is lower and reliability is high.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram of prior art.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
As shown in Figure 2, on the basis of the circuit diagram of prior art shown in Fig. 1, improve, the utility model comprises: the pre-filtering circuit 10 being connected with AC power and rectifier control circuit 20, and rectifier control circuit 20 at least comprises rectifier circuit DR and is connected to the filter capacitor C2 of rectifier control circuit 20 output VOUT+; Be connected to the current-limiting resistance R2 between the output of pre-filtering circuit 10 and the rectifier circuit DR input of rectifier control circuit 20; One group of relay K that normally opened contact is in parallel with current-limiting resistance R2; Be connected to the voltage sample circuit of rectifier control circuit 20 output VOUT+; Be connected to the control relay circuit between voltage sample circuit and relay K.
Voltage sample circuit comprises at least 2 resistance that are serially connected in successively between rectifier control circuit 20 output VOUT+ and ground, such as the present embodiment adopts 4 series resistor R1, R2, R3 and R4, the output that the common port of wherein resistance R 4 ground connection, and resistance R 3 and resistance R 4 is voltage sample circuit.In one embodiment, resistance R 4 is in parallel with a filter capacitor C3.
Control relay circuit comprises: the three end adjustable shunt reference source IC1(that are connected with the output of voltage sample circuit with reference to the utmost point such as, it is the integrated circuit realization of TL431 that three end adjustable shunt reference source IC1 adopt Texas Instruments's model), the plus earth of this three ends adjustable shunt reference source IC1, negative electrode connects the grid of a transistor Q2, series resistor R5 between the grid of this transistor Q2 and emitter, and coil one end of the collector connection relay K of transistor Q2, and the coil other end ground connection of relay K, and connect diode D2 between the coil two ends of relay K, the plus earth of this diode D2.Wherein, transistor Q2 is PMOS transistor.
Operation principle of the present utility model is as follows: the voltage sampling signal of voltage sample circuit output is after filtering after capacitor C 3 filtering, output to the reference utmost point of three end adjustable shunt reference source IC1, the conducting that compares rear control Q2 with the internal reference voltage of three end adjustable shunt reference source IC1 (such as the reference voltage of TL431 inside is 2.5V) and cut-off carry out open circuit and the short circuit of control relay K.In the moment of pre-filtering circuit and AC power connection, by current-limiting resistance R1 resistance, filter capacitor C2 to be charged, the filtered capacitor C 2 of consequent surge current absorbs; When the voltage of filter capacitor C2 rises to set point, after now sampling by voltage sample circuit with the internal reference voltage ratio of three end adjustable shunt reference source IC1, the anode of three end adjustable shunt reference source IC1 and negative electrode conducting, thereby pull transistor Q2 conducting, make one group of normally opened contact adhesive of relay K and by current-limiting resistance R1 two terminal shortcircuits, filter capacitor C2 do not recharged and in stable state.
To sum up, the utility model can effectively solve that electronic equipment is conventional to be started the surge heavy current impact that moment produces and effectively reduce the interference to electrical network, has advantages of that circuit structure is simple, realizes that cost is lower and reliability is high.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. for a control circuit for surge current suppression, comprise the pre-filtering circuit and the rectifier control circuit that are connected with AC power, this rectifier control circuit at least comprises rectifier circuit and is connected to the filter capacitor C2 of rectifier control circuit output; It is characterized in that, also comprise: be connected to the output of pre-filtering circuit and the current-limiting resistance R2 between rectification circuit DR input, be connected to the voltage sample circuit of rectifier control circuit output, be connected to the control relay circuit of voltage sample circuit, the control end of this control relay circuit connects coil one end of relay K, and the other end ground connection of the coil of relay K, and one group of normally opened contact of relay K is connected to the two ends of current-limiting resistance R2.
2. according to claim 1 for the control circuit of surge current suppression, it is characterized in that, voltage sample circuit comprises at least 2 resistance that are serially connected between rectifier control circuit output and ground.
3. according to claim 2 for the control circuit of surge current suppression, it is characterized in that, voltage sample circuit comprises resistance R 1, resistance R 2, resistance R 3 and the resistance R 4 being serially connected in successively between rectifier control circuit output and ground, and resistance R 3 is connected control relay circuit with the common port of resistance R 4.
4. according to claim 3 for the control circuit of surge current suppression, it is characterized in that, voltage sample circuit also comprises the filter capacitor C3 in parallel with resistance R 4.
5. according to claim 1 for the control circuit of surge current suppression, it is characterized in that, control relay circuit comprises: the three end adjustable shunt reference source IC1 that are connected with the output of voltage sample circuit with reference to the utmost point, the plus earth of this three ends adjustable shunt reference source IC1, negative electrode connect the grid of a transistor Q2, and the emitter of this transistor Q2 is connected with external power source, coil one end of collector connection relay K.
6. according to claim 5 for the control circuit of surge current suppression, it is characterized in that, transistor Q2 is PMOS transistor.
7. according to claim 1 for the control circuit of surge current suppression, it is characterized in that, between the coil two ends of relay K, connect diode D2, the plus earth of this diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320494430.4U CN203406605U (en) | 2013-08-14 | 2013-08-14 | Control circuit for inhibiting surge current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320494430.4U CN203406605U (en) | 2013-08-14 | 2013-08-14 | Control circuit for inhibiting surge current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203406605U true CN203406605U (en) | 2014-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320494430.4U Expired - Fee Related CN203406605U (en) | 2013-08-14 | 2013-08-14 | Control circuit for inhibiting surge current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203406605U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505836A (en) * | 2016-12-16 | 2017-03-15 | 张家港华捷电子有限公司 | A kind of low power consumption switch supply unit |
| CN110022053A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | It is a kind of to inhibit the three phase rectifier of function to protect circuit with inrush current |
| CN110033986A (en) * | 2019-05-21 | 2019-07-19 | 安图实验仪器(郑州)有限公司 | Has the control relay circuit for extending relay service life |
| CN113765080A (en) * | 2021-08-31 | 2021-12-07 | 长春捷翼汽车零部件有限公司 | Circuit, method, charging device and storage medium for suppressing power supply starting surge |
| CN116054549A (en) * | 2023-03-27 | 2023-05-02 | 苏州海鹏科技有限公司 | Control module for suppressing hot start surge current of switching power supply |
| CN118174257A (en) * | 2024-05-15 | 2024-06-11 | 厦门科司特电子股份有限公司 | Surge current suppression circuit and charger |
-
2013
- 2013-08-14 CN CN201320494430.4U patent/CN203406605U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505836A (en) * | 2016-12-16 | 2017-03-15 | 张家港华捷电子有限公司 | A kind of low power consumption switch supply unit |
| CN110022053A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | It is a kind of to inhibit the three phase rectifier of function to protect circuit with inrush current |
| CN110022053B (en) * | 2019-03-29 | 2024-03-29 | 合肥华耀电子工业有限公司 | Three-phase rectification protection circuit with input surge current suppression function |
| CN110033986A (en) * | 2019-05-21 | 2019-07-19 | 安图实验仪器(郑州)有限公司 | Has the control relay circuit for extending relay service life |
| CN110033986B (en) * | 2019-05-21 | 2024-02-20 | 安图实验仪器(郑州)有限公司 | Relay control circuit with function of prolonging service life of relay |
| CN113765080A (en) * | 2021-08-31 | 2021-12-07 | 长春捷翼汽车零部件有限公司 | Circuit, method, charging device and storage medium for suppressing power supply starting surge |
| CN116054549A (en) * | 2023-03-27 | 2023-05-02 | 苏州海鹏科技有限公司 | Control module for suppressing hot start surge current of switching power supply |
| CN118174257A (en) * | 2024-05-15 | 2024-06-11 | 厦门科司特电子股份有限公司 | Surge current suppression circuit and charger |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20140122 Termination date: 20170814 |