CN204145289U - Power starting circuit, inverse-excitation type switch power-supply circuit and inverse-excitation type switch power-supply - Google Patents
Power starting circuit, inverse-excitation type switch power-supply circuit and inverse-excitation type switch power-supply Download PDFInfo
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- CN204145289U CN204145289U CN201420467160.2U CN201420467160U CN204145289U CN 204145289 U CN204145289 U CN 204145289U CN 201420467160 U CN201420467160 U CN 201420467160U CN 204145289 U CN204145289 U CN 204145289U
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Abstract
A kind of power starting circuit, inverse-excitation type switch power-supply circuit and inverse-excitation type switch power-supply, this power starting circuit comprises: the first diode, the second diode, the first resistance, the second resistance, the first electric capacity; The anode of described first diode, the anode of the second diode are connected with external communication potential circuit, the negative electrode of described first diode, the negative electrode of the second diode are connected with one end of described first resistance, the other end of described first resistance is connected with described second resistance, the positive pole of described first electric capacity is connected to the common port of described first resistance and described second resistance, the minus earth of described first electric capacity.The utility model can prevent instant high-voltage to impact.
Description
Technical field
The utility model relates to Energy control field, particularly relates to a kind of power starting circuit and inverse-excitation type switch power-supply circuit.
Background technology
Inverse-excitation type switch power-supply comprises flyback transformer, and when armature winding conducting, the secondary winding cut-off of its flyback transformer, this flyback transformer is in energy storage state; And when the armature winding of flyback transformer end, secondary winding conducting time, fault offset stored before to load, is made loaded work piece by this flyback transformer.
But traditional inverse-excitation type switch power-supply circuit is when power initiation, if start-up circuit have input instant high-voltage, then the power supply control chip that is connected with start-up circuit can be made breakdown, cause circuit dangerous.
Utility model content
Based on this, be necessary to provide a kind of power starting circuit that instant high-voltage can be prevented to impact.
In addition, a kind of inverse-excitation type switch power-supply circuit and inverse-excitation type switch power-supply is also provided.
A kind of power starting circuit, comprising:
The anode of described first diode, the anode of the second diode are connected with external communication potential circuit, the negative electrode of described first diode, the negative electrode of the second diode are connected with one end of described first resistance, the other end of described first resistance is connected with described second resistance, the positive pole of described first electric capacity is connected to the common port of described first resistance and described second resistance, the minus earth of described first electric capacity.
A kind of inverse-excitation type switch power-supply circuit, comprising: electromagnetic interference suppression circuit, input rectifying filter circuit, the flyback switching control circuit comprising control chip, output rectifier and filter, voltage sample feedback circuit and power starting circuit;
Described power starting circuit comprises the first diode, the second diode, the first resistance, the second resistance, the first electric capacity;
The anode of described first diode, the anode of the second diode are connected with described electromagnetic interference suppression circuit, the negative electrode of described first diode, the negative electrode of the second diode are connected with one end of described first resistance, the other end of described first resistance is connected with the control chip of described flyback switching control circuit by described second resistance, the positive pole of described first electric capacity is connected to the common port of described first resistance and described second resistance, the minus earth of described first electric capacity;
The input of described input rectifying filter circuit is connected with the output of described electromagnetic interference suppression circuit, described flyback switching control circuit is connected between described input rectifying filter circuit and described output rectifier and filter, the input of described power starting circuit is connected with the output of described electromagnetic interference suppression circuit, and the output of described power starting circuit is connected with the control chip of described flyback switching control circuit; The input of described voltage sample feedback circuit is connected with the output of described output rectifier and filter, and the output of described voltage sample feedback circuit is connected with the control chip of described flyback switching control circuit.
Wherein in an embodiment, described flyback switching control circuit comprises:
Absorptive unit, transformer converting unit, comprise the switch control unit of control chip;
The input of described absorptive unit is connected with described input rectifying filter circuit, and the output of described absorptive unit is connected with the input of described transformer converting unit, and the output of described transformer converting unit is connected with described output rectifier and filter; The control chip of described switch control unit is connected between described power starting circuit and described transformer converting unit.
Wherein in an embodiment, described flyback switching control circuit also comprises current detecting unit, and described current detecting unit is connected with described switch control unit.
Wherein in an embodiment, described electromagnetic interference suppression circuit comprises transformer, first termination civil power of the first end of the primary coil of described transformer and the secondary coil of described transformer, the second end of the primary coil of described transformer is connected with described power starting circuit respectively with the second termination of the secondary coil of described transformer.
Wherein in an embodiment, described input rectifying filter circuit comprises rectifier bridge and electrochemical capacitor, and the input of described rectifier bridge connects the output of described electromagnetic interference suppression circuit, and described electrochemical capacitor is connected to the output of described rectifier bridge.
Wherein in an embodiment; described output rectifier and filter comprises output rectifier diode, filter capacitor, protection electric capacity and protective resistance; the two ends of described rectifier diode are connected in parallel on to prevent described rectifier diode reverse breakdown after described protection electric capacity and protective resistance series connection; the positive pole of described filter capacitor is connected with the negative electrode of described rectifier diode, the minus earth of described filter capacitor.
A kind of inverse-excitation type switch power-supply, comprises above-mentioned inverse-excitation type switch power-supply circuit.
Above-mentioned power starting circuit by arranging the first diode, the second diode carries out rectification, then the positive pole of the first electric capacity is connected to the common port of the first resistance and described second resistance, the first electric capacity and the first resistance is made to form a low pass filter, and the second resistance has cushioning effect, can be filtered when transient high voltage inputs like this, and reduce the percussion of transient high voltage to circuit below further by the second resistance, namely can instant high-voltage be prevented well to impact.
Above-mentioned inverse-excitation type switch power-supply circuit and switch flyback switch circuit comprise power starting circuit, described power starting circuit arranges the first diode, second diode carries out rectification, then the positive pole of the first electric capacity is connected to the common port of the first resistance and described second resistance, the first electric capacity and the first resistance is made to form a low pass filter, and the second resistance has cushioning effect, can be filtered when transient high voltage inputs like this, and reduce the percussion of transient high voltage to circuit below further by the second resistance, namely can instant high-voltage be prevented well to impact, ensure that whole circuit safety.
Accompanying drawing explanation
Fig. 1 is the power starting circuit schematic diagram of an embodiment;
Fig. 2 is the inverse-excitation type switch power-supply circuit module map of an embodiment;
Fig. 3 is the inverse-excitation type switch power-supply circuit schematic diagram shown in Fig. 2.
Embodiment
As shown in Figure 1, be the power starting circuit schematic diagram of an embodiment.
This power starting circuit comprises: the first diode D1, the second diode D2, the first resistance R1, the second resistance R2, the first electric capacity C1.
Particularly, the anode of the first diode D1, the anode of the second diode D2 are connected with external communication potential circuit, the negative electrode of the first diode D1, the negative electrode of the second diode D2 are connected with one end of the first resistance R1, and the other end of the first resistance R2 is connected with the second resistance R2.The positive pole of the first electric capacity C1 is connected to the common port of the first resistance R1 and the second resistance R2, the minus earth of the first electric capacity C1.
First diode D1, the second diode D2 are for rectification.First resistance R1 and the first electric capacity C1 defines a low pass filter, can be filtered like this when transient high voltage inputs.Second resistance R2 plays the effect of a buffering, can reduce the percussion of transient high voltage to circuit below further.
In the present embodiment, this power starting circuit is used for, in inverse-excitation type switch power-supply circuit, being appreciated that in other embodiments, and this power starting circuit can also use any needs in the circuit preventing instant high-voltage to impact.
Please refer to Fig. 2, is the inverse-excitation type switch power-supply circuit module map of an embodiment.
This inverse-excitation type switch power-supply circuit comprises the electromagnetic interference suppression circuit 110, input rectifying filter circuit 120, flyback switching control circuit 130, output rectifier and filter 140, power starting circuit 150 and the voltage sample feedback circuit 160 that connect successively, and wherein flyback switching control circuit 130 comprises control chip (not shown in Fig. 2).
The input of input rectifying filter circuit 120 is connected with the output of electromagnetic interference suppression circuit 110, and flyback switching control circuit 130 is connected between input rectifying filter circuit 120 and output rectifier and filter 140.The input of power starting circuit 150 is connected with the output of electromagnetic interference suppression circuit 110, and the input of such power starting circuit 150 does not also carry out energy storage and charging through input rectifying filtering, effectively can reduce stand-by power consumption.The output of power starting circuit 150 is connected with the control chip of flyback switching control circuit 130.The input of voltage sample feedback circuit 160 is connected with the output of output rectifier and filter 140, and the output of voltage sample feedback circuit 160 is connected with the control chip of flyback switching control circuit 130.
Wherein, electromagnetic interference suppression circuit 110 is for suppressing the electromagnetic interference of the High Level AC Voltage generation inputted.Input rectifying filter circuit 120 is for realizing the conversion of AC-to DC.Flyback switching control circuit 130 controls and the direct current of stable output the entirety of circuit for realizing.Output rectifier and filter 140 is for realizing the rectifying and wave-filtering again before voltage exports to load.Power starting circuit 150 works for starting flyback switching control circuit 130, simultaneously also for preventing the impact of instant high-voltage.The voltage that voltage sample feedback circuit 160 is exported by sampling output rectifier and filter 140 is delivered in the control chip of flyback switching control circuit 130.
Be appreciated that in other embodiments, the input of power starting circuit 150 can also be connected with the output of input rectifying filter circuit 120.
Please refer to Fig. 3, is inverse-excitation type switch power-supply circuit schematic diagram embodiment illustrated in fig. 2.
Electromagnetic interference suppression circuit 110 comprises transformer LG1, first termination civil power of the first end of the primary coil of transformer LG1 and the secondary coil of transformer LG1, the second end of the primary coil of transformer LG1 is connected with power starting circuit 150 respectively with the second termination of the secondary coil of transformer LG1.After circuit ON, each circuit element is in running order, and civil power realizes voltage transformation through the transformer LG1 of electromagnetic interference suppression circuit 110.
The rectifier bridge that input rectifying filter circuit 120 comprises electrochemical capacitor C3 and is made up of diode D3, diode D4, diode D5 and diode D6, the input of described rectifier bridge, for connecting AC power, carries out full-wave rectification to alternating current.The output that electrochemical capacitor C3 is connected to described rectifier bridge carries out filtering process.
Flyback switching control circuit 130 comprises absorptive unit 132, transformer converting unit 134, switch control unit 136 and current detecting unit 138, and wherein switch control unit 136 comprises control chip U1.
The input of absorptive unit 132 is connected with input rectifying filter circuit 120, and the output of absorptive unit 132 is connected with the input of transformer converting unit 134, and the output of transformer converting unit 134 is connected with output rectifier and filter 140.The control chip U1 of switch control unit 136 is connected between power starting circuit 150 and transformer converting unit 134.Current detecting unit 138 is connected with the control chip U1 of switch control unit 136.
Control chip U1 has 7 pins, is high voltage startup pin hv, power supply pin vcc, driving pin drv, current detecting pin cs, feedback pin fb, function and protecting pin latch and grounding leg gnd respectively.
Output rectifier and filter 140 comprises output rectifier diode D9, filter capacitor C9 and filter capacitor C10, protection electric capacity C8 and protective resistance R11; the two ends of rectifier diode D9 are connected in parallel on to prevent rectifier diode D9 reverse breakdown after protection electric capacity C8 and protective resistance R11 series connection; filter capacitor C9 is connected with the negative electrode of rectifier diode D9 with the positive pole of filter capacitor C10, minus earth.
Power starting circuit 150 comprises the first diode D1, the second diode D2, the first resistance R1, the second resistance R2, the first electric capacity C1.
The anode of the first diode D1, the anode of the second diode D2 are connected with electromagnetic interference suppression circuit 110, the negative electrode of the first diode D1, the negative electrode of the second diode D2 are connected with one end of the first resistance R1, the other end of the first resistance R1 is connected with the high voltage startup pin hv of the control chip U1 of switch control unit 136 by the second resistance R2, the positive pole of the first electric capacity C1 is connected to the common port of the first resistance R1 and the second resistance R2, the minus earth of the first electric capacity C1.
The operation principle of foregoing circuit is described referring to Fig. 3.
After circuit ON, each circuit element is in running order, and civil power realizes voltage transformation through the transformer of electromagnetic interference suppression circuit 110.Alternating current after voltage transformation by rectification, the filtering of the rectifier bridge of input rectifying filter circuit 120 and electrochemical capacitor, achieves alternating current to DC power conversion again.Flyback switching control circuit 130 pairs of integrated circuits control and direct current are become more stable, finally realize rectification again by output rectifier and filter 140 again and filtering is powered to load.
Power starting circuit 150 is connected between the output of electromagnetic interference suppression circuit 110 and the high voltage startup hv pin of control chip U1, instant high-voltage can also be prevented the impact of control chip U1 while startup control chip U1 like this, ensure that control chip U1 can not be breakdown.Voltage sample feedback circuit 160 is delivered in the feedback pin fb of the control chip U1 of flyback switching control circuit 130 by the voltage that sampling output rectifier and filter 140 exports and is made flyback switching control circuit 130 can control circuit better.
A kind of inverse-excitation type switch power-supply comprising above-mentioned inverse-excitation type switch power-supply circuit is also provided.
Above-mentioned inverse-excitation type switch power-supply circuit and switch flyback switch circuit comprise power starting circuit, described power starting circuit arranges the first diode, second diode carries out rectification, then the positive pole of the first electric capacity is connected to the common port of the first resistance and described second resistance, the first electric capacity and the first resistance is made to form a low pass filter, and the second resistance has cushioning effect, can be filtered when transient high voltage inputs like this, and reduce the percussion of transient high voltage to circuit below further by the second resistance, namely can instant high-voltage be prevented well to impact, ensure that whole circuit safety.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (8)
1. a power starting circuit, is characterized in that, comprising:
First diode, the second diode, the first resistance, the second resistance, the first electric capacity;
The anode of described first diode, the anode of the second diode are connected with external communication potential circuit, the negative electrode of described first diode, the negative electrode of the second diode are connected with one end of described first resistance, the other end of described first resistance is connected with described second resistance, the positive pole of described first electric capacity is connected to the common port of described first resistance and described second resistance, the minus earth of described first electric capacity.
2. an inverse-excitation type switch power-supply circuit, comprising:
Electromagnetic interference suppression circuit, input rectifying filter circuit, the flyback switching control circuit comprising control chip, output rectifier and filter and voltage sample feedback circuit;
It is characterized in that, also comprise power starting circuit;
Described power starting circuit comprises the first diode, the second diode, the first resistance, the second resistance, the first electric capacity;
The anode of described first diode, the anode of the second diode are connected with described electromagnetic interference suppression circuit, the negative electrode of described first diode, the negative electrode of the second diode are connected with one end of described first resistance, the other end of described first resistance is connected with the control chip of described flyback switching control circuit by described second resistance, the positive pole of described first electric capacity is connected to the common port of described first resistance and described second resistance, the minus earth of described first electric capacity;
The input of described input rectifying filter circuit is connected with the output of described electromagnetic interference suppression circuit, described flyback switching control circuit is connected between described input rectifying filter circuit and described output rectifier and filter, the input of described power starting circuit is connected with the output of described electromagnetic interference suppression circuit, and the output of described power starting circuit is connected with the control chip of described flyback switching control circuit; The input of described voltage sample feedback circuit is connected with the output of described output rectifier and filter, and the output of described voltage sample feedback circuit is connected with the control chip of described flyback switching control circuit.
3. inverse-excitation type switch power-supply circuit according to claim 2, is characterized in that, described flyback switching control circuit comprises:
Absorptive unit, transformer converting unit, comprise the switch control unit of control chip;
The input of described absorptive unit is connected with described input rectifying filter circuit, and the output of described absorptive unit is connected with the input of described transformer converting unit, and the output of described transformer converting unit is connected with described output rectifier and filter; The control chip of described switch control unit is connected between described power starting circuit and described transformer converting unit.
4. inverse-excitation type switch power-supply circuit according to claim 3, is characterized in that, described flyback switching control circuit also comprises current detecting unit, and described current detecting unit is connected with described switch control unit.
5. inverse-excitation type switch power-supply circuit according to claim 2, it is characterized in that, described electromagnetic interference suppression circuit comprises transformer, first termination civil power of the first end of the primary coil of described transformer and the secondary coil of described transformer, the second end of the primary coil of described transformer is connected with described power starting circuit respectively with the second termination of the secondary coil of described transformer.
6. inverse-excitation type switch power-supply circuit according to claim 2, it is characterized in that, described input rectifying filter circuit comprises rectifier bridge and electrochemical capacitor, the input of described rectifier bridge connects the output of described electromagnetic interference suppression circuit, and described electrochemical capacitor is connected to the output of described rectifier bridge.
7. inverse-excitation type switch power-supply circuit according to claim 2; it is characterized in that; described output rectifier and filter comprises output rectifier diode, filter capacitor, protection electric capacity and protective resistance; the two ends of described rectifier diode are connected in parallel on to prevent described rectifier diode reverse breakdown after described protection electric capacity and protective resistance series connection; the positive pole of described filter capacitor is connected with the negative electrode of described rectifier diode, the minus earth of described filter capacitor.
8. an inverse-excitation type switch power-supply, is characterized in that, comprises the inverse-excitation type switch power-supply circuit as described in any one of claim 2 ~ 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420467160.2U CN204145289U (en) | 2014-08-18 | 2014-08-18 | Power starting circuit, inverse-excitation type switch power-supply circuit and inverse-excitation type switch power-supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420467160.2U CN204145289U (en) | 2014-08-18 | 2014-08-18 | Power starting circuit, inverse-excitation type switch power-supply circuit and inverse-excitation type switch power-supply |
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| CN204145289U true CN204145289U (en) | 2015-02-04 |
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| CN201420467160.2U Expired - Fee Related CN204145289U (en) | 2014-08-18 | 2014-08-18 | Power starting circuit, inverse-excitation type switch power-supply circuit and inverse-excitation type switch power-supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528465A (en) * | 2016-06-15 | 2017-12-29 | 广东美的生活电器制造有限公司 | Cooking machine and cooking machine circuit |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528465A (en) * | 2016-06-15 | 2017-12-29 | 广东美的生活电器制造有限公司 | Cooking machine and cooking machine circuit |
| CN107528465B (en) * | 2016-06-15 | 2019-11-29 | 广东美的生活电器制造有限公司 | Cooking machine and cooking machine circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000 Nanshan medical equipment Industrial Park, No. 1019, Nanshan Road, Nanshan District, Shenzhen, Guangdong Province, A211-A213 Patentee after: Shenzhen Hai Yun new energy Co.,Ltd. Address before: 518000 Nanshan District, Guangdong, South China Sea Road, No. 1019 Nanshan medical equipment Industrial Park, A408, B401-403, Patentee before: SHENZHEN LANDING TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 |
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| CF01 | Termination of patent right due to non-payment of annual fee |