CN212660101U - Anti-surge current control circuit - Google Patents
Anti-surge current control circuit Download PDFInfo
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- CN212660101U CN212660101U CN202021036345.XU CN202021036345U CN212660101U CN 212660101 U CN212660101 U CN 212660101U CN 202021036345 U CN202021036345 U CN 202021036345U CN 212660101 U CN212660101 U CN 212660101U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses an anti-surge current control circuit, include: the device comprises a rectifying circuit, a PFC main circuit, an energy storage circuit, an anti-surge circuit, a filter circuit and a detection circuit; the alternating current input end of the rectifying circuit is used as the alternating current input end Vin of the control circuit, the first direct current output end is connected with the input end of the PFC main circuit, the input end of the anti-surge circuit and the input end of the filter circuit, and the second direct current output end is connected with the output end of the filter circuit and one end of the detection circuit; the output end of the anti-surge circuit is used as a direct current output end Vout of the control circuit and is connected with the output end of the PFC main circuit and one end of the energy storage circuit; the other end of the detection circuit and the other end of the energy storage circuit are grounded. The utility model discloses can solve the surge current problem that the cold start of a lot of produced in the twinkling of an eye, need not worry the influence of electric current after the cold start and efficiency after the normal start, utilize simple circuit to use, improve the electric current impact risk of product.
Description
Technical Field
The utility model relates to a surge current protection field, in particular to prevent surge current control circuit.
Background
Safety and stability are indispensable requirements for application of power supply equipment, and although a conventional power supply can solve some surge current problems by adding a thermistor independently, at present, regulations have requirements for realizing harmonic current for power supply products with the power supply voltage of more than 75W, so that active PFC circuits are required to be added for various power supplies with the power supply voltage of more than 75W, but after the active PFC circuits are added, the problem of large surge current is easily caused at the moment of starting up due to reasons such as energy storage inductance and the like. Many devices, such as televisions, computers, projectors, etc., need to be turned on and off many times every day, surge current generated at the moment of turning on the high-power electronic device products is very large, and parts inside the products are easily damaged, so that many factors need to be considered in the design of an internal power supply.
In the prior art, there are many ways to reduce the instantaneous surge current, but because of the requirements for product efficiency, power and volume, the power requirements are usually not competitive in terms of cost and volume.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an anti-surge current control circuit has advantages such as the circuit is simple, small, with low costs.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
an anti-inrush current control circuit comprising: the device comprises a rectifying circuit, a PFC main circuit, an energy storage circuit, an anti-surge circuit, a filter circuit and a detection circuit;
the alternating current input end of the rectifying circuit is used as the alternating current input end Vin of the control circuit, the first direct current output end is connected with the input end of the PFC main circuit, the input end of the anti-surge circuit and the input end of the filter circuit, and the second direct current output end is connected with the output end of the filter circuit and one end of the detection circuit;
the output end of the anti-surge circuit is used as a direct current output end Vout of the control circuit and is connected with the output end of the PFC main circuit and one end of the energy storage circuit;
the other end of the detection circuit and the other end of the energy storage circuit are grounded.
Preferably, the PFC main circuit includes an inductor L, a first diode D1, a first pwm branch and a second pwm branch, one end of the inductor L is used as the input end of the PFC main circuit, the other end of the inductor L is connected to the anode of the first diode D1, the control end of the first pwm branch and the control end of the second pwm branch, and the cathode of the first diode D1 is used as the output end of the PFC main circuit.
Preferably, the first PWM branch comprises a first transistor Q1, a third diode D3, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, the drain of the first transistor Q1 is used as the control end of the first PWM branch, the gate of the first transistor Q1 is connected to one end of the third resistor R3, one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the third resistor R3 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to the other end of the fourth resistor R4 and is used as the first PWM branch input end PWM1, and the source of the first transistor Q1 and the other end of the fifth resistor R5 are grounded.
Preferably, the second PWM branch includes a second transistor Q2, a fourth diode D4, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, the drain of the second transistor Q2 is used as the control end of the second PWM branch, the gate of the second transistor Q2 is connected to one end of the sixth resistor R6, one end of the seventh resistor R7 and one end of the eighth resistor R8, the other end of the sixth resistor R6 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the other end of the seventh resistor R7 and is used as the second PWM branch input end PWM2, and the source of the second transistor Q2 and the other end of the eighth resistor R8 are grounded.
Preferably, the anti-surge circuit comprises a resistor RT and a second diode D2, one end of the resistor RT is used as the input end of the anti-surge circuit, the other end of the resistor RT is connected with the anode of the second diode D2, and the cathode of the second diode is used as the output end of the anti-surge circuit.
Preferably, the resistor RT is a positive temperature coefficient thermistor.
Preferably, the rectifying circuit is a full bridge rectifying bridge.
Preferably, the filter circuit is a first capacitor C1.
Preferably, the detection circuit includes a first resistor R1 and a second resistor R2, the first resistor R1 has one end connected to one end of the second resistor R2 as one end of the detection circuit, and the other end of the first resistor R1 is connected to the other end of the second resistor R2 as the other end of the detection circuit.
Preferably, the energy storage circuit is a second capacitor C2.
By adopting the structure, the problem of surge current generated instantly when cold starting is carried out for multiple times can be solved, the scheme is very flexible and convenient to apply to a power supply in 1200W, the influence of the current after cold starting and the efficiency after normal starting is not needed to be worried about, and the current impact risk of a product is improved by using simple circuit application; after alternating current rectification, the high current from the rectification circuit to the energy storage circuit is shunted, and the anti-surge circuit cannot consume current after the energy storage circuit is full of voltage.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
Fig. 1 is a schematic block diagram of a control circuit of the present invention;
fig. 2 is a schematic diagram of a control circuit according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the utility model discloses an anti-surge current control circuit, include: the device comprises a rectifying circuit, a PFC main circuit, an energy storage circuit, an anti-surge circuit, a filter circuit and a detection circuit;
the alternating current input end of the rectifying circuit is used as the alternating current input end Vin of the control circuit, the first direct current output end is connected with the input end of the PFC main circuit, the input end of the anti-surge circuit and the input end of the filter circuit, and the second direct current output end is connected with the output end of the filter circuit and one end of the detection circuit;
the output end of the anti-surge circuit is used as a direct current output end Vout of the control circuit and is connected with the output end of the PFC main circuit and one end of the energy storage circuit;
the other end of the detection circuit and the other end of the energy storage circuit are grounded.
Referring to fig. 2, this embodiment provides an inrush current protection control circuit, where the main PFC circuit includes an inductor L, a first diode D1, a first pwm branch and a second pwm branch, one end of the inductor L is used as an input end of the main PFC circuit, the other end of the inductor L is connected to an anode of the first diode D1, a control end of the first pwm branch and a control end of the second pwm branch, and a cathode of the first diode D1 is used as an output end of the main PFC circuit.
The first PWM branch comprises a first transistor Q1, a third diode D3, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, the drain of the first transistor Q1 is used as the control end of the first PWM branch, the gate of the first transistor Q1 is connected to one end of the third resistor R3, one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the third resistor R3 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to the other end of the fourth resistor R4 and is used as the PWM input end of the first PWM branch 1, and the source of the first transistor Q1 and the other end of the fifth resistor R5 are grounded. The first transistor Q1 is a field effect transistor or an insulated gate bipolar transistor.
The second PWM branch comprises a second transistor Q2, a fourth diode D4, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, the drain of the second transistor Q2 is used as the control end of the second PWM branch, the gate of the second transistor Q2 is connected to one end of the sixth resistor R6, one end of the seventh resistor R7 and one end of the eighth resistor R8, the other end of the sixth resistor R6 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the other end of the seventh resistor R7 and is used as the PWM2 input end of the second PWM branch, and the source of the second transistor Q2 and the other end of the eighth resistor R8 are grounded. The second transistor Q2 is a field effect transistor or an insulated gate bipolar transistor.
Prevent surge circuit includes resistor RT and second diode D2, resistor RT one end is as prevent surge circuit input, the resistor RT other end is connected second diode D2 positive pole, the second diode negative pole is as prevent surge circuit output. The resistor RT is a positive temperature coefficient thermistor, and the conduction voltage drop of the first diode D1 is smaller than that of the second diode D2. The rectification circuit is a full bridge rectification bridge. The tank circuit is a second capacitor C2.
The filter circuit is a first capacitor C1. The capacitor C1 provides a bypass path in front of the rectifier bridge for the high-frequency ripple current generated when the PFC main circuit works, the reverse recovery loss of the rectifier bridge is reduced, the fall between the wave crest and the wave trough of the high-frequency ripple current is not large, the waveform is smoother, the EMI interference can be reduced due to the reduction of the area of the high-frequency loop, and meanwhile, the capacitor C1 plays a decoupling role, because the current waveform on the rectifier bridge is a sine wave, but the input current of the PFC main circuit is superposed with high-frequency components on the steamed bread waves, and the high-frequency components need a capacitor to filter the high-frequency components, so the capacitor C1 needs to filter the high-frequency components.
The detection circuit comprises a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 is connected with one end of the second resistor R2 and serves as one end of the detection circuit, and the other end of the first resistor R1 is connected with the other end of the second resistor R2 and serves as the other end of the detection circuit.
The detection circuit detects the current of a transistor loop of the PFC main circuit returning to a rectifier bridge after being conducted, the resistance values of the resistor R1 and the resistor R2 can be adjusted according to different output powers, and the voltages detected at two ends of the resistor R1 and the resistor R2 can be sent to a control chip of the PFC main circuit for comparison, so that the value of the PFC is adjusted.
The high-power product needs a large-capacity capacitor C2 for storing energy, the capacity of the capacitor is determined by the power, and the current during cold start is related to the capacity of the capacitor. When PWM signals (a PWM1 signal and a PWM2 signal) are supplied to the gates of the transistors Q1 and Q2, the transistors Q1 and Q2 can be switched on or off, so that energy storage of the inductor L is realized, a complete boost circuit is formed, and when the PFC main circuit works, the difficulty in selecting the diode D1 is increased due to the problem of surge current.
When no anti-surge circuit (resistor RT and diode D1) is provided, the current at the startup moment directly forms a surge current loop through the inductor L via the diode D1 and the capacitor C2, and the size of the capacitor C2 directly determines the size of the surge current, so that the current at the startup moment is large and the product is damaged easily in a product with large power. In the embodiment, the PFC main circuit is connected with the anti-surge circuit in parallel, and the anti-surge circuit can solve the problem of current applied to the inductor L and the diode D1 at the moment of starting. When the cold start-up, condenser C2 has not had the voltage at all and is equivalent to the short circuit, therefore the electric current is very big in the twinkling of an eye, except that diode D1 can constitute the current loop this moment, additionally forms the reposition of redundant personnel on preventing the surge circuit, and in case condenser C2 is started again after being full of the electricity, just can not have the production of heavy current, simultaneously, because diode D1 pressure drop is little, after normal work, main current can flow through diode D1, so prevent the consumption that the surge circuit can not produce the energy yet, so the utility model discloses unusual practicality. After the normal operation of the power-on, the output voltage of the PFC main circuit is connected to the output terminal of the anti-surge circuit and is higher than the voltage of the input terminal of the anti-surge circuit, so that the diode D2 is in a reverse bias cut-off state, which has no influence on the operation of the circuit and does not generate energy consumption.
Because the switching tube (the first transistor Q1 and the second transistor Q2) is turned off when the inductive current is not zero, and needs to bear larger stress, and the diode D1 is required to have extremely low or even zero reverse recovery current, the diode D1 adopts a fast recovery diode, but the fast recovery diode has weaker ability to bear surge current, and the reduction of the reverse recovery current and the improvement of the surge voltage bearing capacity are mutually limited, therefore, the diode D2 adopts a common rectifier diode, and has strong ability to bear surge current, for example, the rated current 3A of the diode with the model number of 1N5407, and the surge current can reach 200A; the diode D2 reduces surge surges to the inductor L, the diode D1, the first transistor Q1, and the second transistor Q2.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.
Claims (10)
1. An anti-inrush current control circuit, comprising: the device comprises a rectifying circuit, a PFC main circuit, an energy storage circuit, an anti-surge circuit, a filter circuit and a detection circuit;
the alternating current input end of the rectifying circuit is used as the alternating current input end Vin of the control circuit, the first direct current output end is connected with the input end of the PFC main circuit, the input end of the anti-surge circuit and the input end of the filter circuit, and the second direct current output end is connected with the output end of the filter circuit and one end of the detection circuit;
the output end of the anti-surge circuit is used as a direct current output end Vout of the control circuit and is connected with the output end of the PFC main circuit and one end of the energy storage circuit;
the other end of the detection circuit and the other end of the energy storage circuit are grounded.
2. The inrush current protection control circuit of claim 1, wherein: the PFC main circuit comprises an inductor L, a first diode D1, a first pulse width modulation branch and a second pulse width modulation branch, one end of the inductor L is used as the input end of the PFC main circuit, the other end of the inductor L is connected with the anode of the first diode D1, the control end of the first pulse width modulation branch and the control end of the second pulse width modulation branch, and the cathode of the first diode D1 is used as the output end of the PFC main circuit.
3. The inrush current protection control circuit of claim 2, wherein: the first PWM branch comprises a first transistor Q1, a third diode D3, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, the drain of the first transistor Q1 is used as the control end of the first PWM branch, the gate of the first transistor Q1 is connected to one end of the third resistor R3, one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the third resistor R3 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to the other end of the fourth resistor R4 and is used as the PWM input end of the first PWM branch 1, and the source of the first transistor Q1 and the other end of the fifth resistor R5 are grounded.
4. The inrush current protection control circuit of claim 2, wherein: the second PWM branch comprises a second transistor Q2, a fourth diode D4, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, the drain of the second transistor Q2 is used as the control end of the second PWM branch, the gate of the second transistor Q2 is connected to one end of the sixth resistor R6, one end of the seventh resistor R7 and one end of the eighth resistor R8, the other end of the sixth resistor R6 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the other end of the seventh resistor R7 and is used as the PWM2 input end of the second PWM branch, and the source of the second transistor Q2 and the other end of the eighth resistor R8 are grounded.
5. The inrush current protection control circuit of claim 1, wherein: prevent surge circuit includes resistor RT and second diode D2, resistor RT one end is as prevent surge circuit input, the resistor RT other end is connected second diode D2 positive pole, the second diode negative pole is as prevent surge circuit output.
6. The inrush current protection control circuit of claim 5, wherein: the resistor RT is a positive temperature coefficient thermistor.
7. The inrush current protection control circuit of claim 1, wherein: the rectification circuit is a full bridge rectification bridge.
8. The inrush current protection control circuit of claim 1, wherein: the filter circuit is a first capacitor C1.
9. The inrush current protection control circuit of claim 1, wherein: the detection circuit comprises a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 is connected with one end of the second resistor R2 and serves as one end of the detection circuit, and the other end of the first resistor R1 is connected with the other end of the second resistor R2 and serves as the other end of the detection circuit.
10. The inrush current protection control circuit of claim 1, wherein: the tank circuit is a second capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021036345.XU CN212660101U (en) | 2020-06-09 | 2020-06-09 | Anti-surge current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021036345.XU CN212660101U (en) | 2020-06-09 | 2020-06-09 | Anti-surge current control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN212660101U true CN212660101U (en) | 2021-03-05 |
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| CN202021036345.XU Active CN212660101U (en) | 2020-06-09 | 2020-06-09 | Anti-surge current control circuit |
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| CN (1) | CN212660101U (en) |
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Address after: 361000 unit 201, 46 Siming Industrial Park, Meixi Road, Tong'an District, Xiamen City, Fujian Province Patentee after: Xiamen Kesite Electronics Co.,Ltd. Country or region after: China Address before: 361000 unit 201, 46 Siming Industrial Park, Meixi Road, Tong'an District, Xiamen City, Fujian Province Patentee before: XIAMEN CASTEC ELECTRONIC INDUSTRY Co.,Ltd. Country or region before: China |