CN203457054U - Wide input voltage flyback switching power supply suitable for DC motor driving - Google Patents
Wide input voltage flyback switching power supply suitable for DC motor driving Download PDFInfo
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- CN203457054U CN203457054U CN201320544893.7U CN201320544893U CN203457054U CN 203457054 U CN203457054 U CN 203457054U CN 201320544893 U CN201320544893 U CN 201320544893U CN 203457054 U CN203457054 U CN 203457054U
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Abstract
The utility model relates to a wide input voltage flyback switching power supply suitable for DC motor driving. The flyback switching power supply comprises a power starting circuit, a clamping circuit, a switch transformer, a constant power circuit and a constant-voltage control circuit in sequencedirect current motor . The power start circuit is connected with the switch transformer and the constant-voltage control circuit. The switching power supply enables ultra-wide input voltage and can be used as a driving power of a medium power DC motor by relatively low cost. Power efficiency reaches up to more than 85%, input voltage range is wide, and maximum output power reaches 240W.
Description
Technical field
The utility model relates to a kind of Switching Power Supply, specifically a kind of wide input voltage inverse-excitation type switch power-supply circuit that is applicable to direct current machine driving.
Background technology
Ac commercial power voltage is in the world commonly 100-120V or 220-240V, some electric power backward areas scopes range of the fluctuation of voltage are very large, maximum can fluctuate to 300V by 80, existing widely used Switching Power Supply, general inverse-excitation type switch power-supply converter input voltage range can only be satisfied with the relation of 1:3, be 90-270VAC, the change range of input voltage of forward converter is less, is only 90-130VAC or 180-264VAC; And the converter input voltage range of using boost mode (AFC) also a 90-270VAC(and cost higher), under prior art condition, product input voltage is if any large variation, product Switching Power Supply used must redesign, and this will make product design and management cost increase.And the converter input voltage range 90-270VAC of use boost mode (AFC) really can meet most areas voltage request, but the large cost of power volume is high, to some special areas, still cannot meet.
Utility model content
For the deficiencies in the prior art, the utility model provides a kind of input voltage range wide, the large switching power circuit that also can reliably start fast of power output.
The technical scheme that the utility model adopted is for achieving the above object:
Be applicable to the wide input voltage inverse-excitation type switch power-supply that direct current machine drives, comprise: the power starting circuit being linked in sequence, clamp circuit, switch transformer, permanent power circuit and constant-voltage control circuit, power starting circuit is connected with switch transformer, constant-voltage control circuit.
Described power starting circuit adopts switching power source chip; The reference input of switching power source chip is connected with DC power supply by resistance, the power end of switching power source chip is connected with DC power supply by resistance R 7, diode D8, also by diode D3, resistance R 14, diode D6, be connected feedback winding other end ground connection with feedback winding one end of switch transformer.
Described clamp circuit comprises a plurality of resistance and diode; DC power supply is connected with armature winding one end of switch transformer, also by diode D2, the D4 being linked in sequence, is connected with the armature winding other end, and D2 the two poles of the earth are connected with the parallel circuits of resistance and electric capacity, and described parallel circuits is series resistance also; The armature winding other end of switch transformer is also connected with the D utmost point of switching tube Q1, and the S utmost point of Q1 is connected with the switching power source chip overcurrent sample end of power starting circuit, and the G utmost point is connected with switching power source chip drive output by the parallel circuits of resistance and diode.
Described permanent power circuit comprises resistance, triode Q2 and photoelectrical coupler U1; One end of the secondary winding of switch transformer is connected with the emitter of triode Q2, also by resistance R 16, R19, be connected with the base stage of Q2, the collector electrode of Q2 is connected with the light-emitting diodes tube cathode of photoelectrical coupler U1 through resistance R 21, and the anode of photodiode is connected with constant-voltage control circuit; The intermediate node of resistance R 16, R19 is as ground end, and the other end of the secondary winding of switch transformer is connected with positive voltage and after inductance L 1 is connected with positive supply, as positive voltage output end, is connected with motor; Between the two ends of secondary winding, be connected with capacitor C 6.
Described constant-voltage control circuit comprises photoelectrical coupler IC2, resistance and electric capacity; The photodiode minus earth of photoelectrical coupler IC2, anode is connected with the switching power source chip feedback end of power starting circuit, also, with the photodiode anodic bonding of permanent power circuit photoelectrical coupler U1, between the negative electrode of the photodiode of photoelectrical coupler IC2 and anode, be connected with electric capacity; The light-emitting diodes tube anode of photoelectrical coupler IC2 is connected with positive voltage, negative electrode is connected with the negative electrode of shunt reference source IC3, the plus earth of shunt reference source, with reference to the utmost point, by resistance R 22, be connected with positive supply, also, by resistance R 23, R24 ground connection, between the reference utmost point of shunt reference source and negative electrode, be in series with resistance R 20 and capacitor C 9; Between positive supply and ground, be in series with resistance R 26 and light-emitting diode.
The utlity model has following beneficial effect and advantage:
1. the utility model can be used lower cost, and realizing super wide input voltage also can be as the driving power of mid power direct current machine, and power-efficient is up to more than 85%.
2. the utility model input voltage range is 70-320VAC, and peak power output can reach 240W; Can adapt to the user demand of electrical network all over the world.
3. power starting circuit of the present utility model can meet the requirement of input voltage wide region, and then reaches the user demand that meets various different electrical networks.
Accompanying drawing explanation
Fig. 1 is hardware structure diagram of the present utility model;
Fig. 2 is power starting circuit figure of the present utility model;
Fig. 3 is clamp circuit figure;
Fig. 4 a is permanent power circuit figure mono-;
Fig. 4 b is permanent power circuit figure bis-;
Fig. 5 is constant-voltage control circuit figure;
Fig. 6 is switching power circuit figure of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, the utility model comprises power starting circuit 1, clamp circuit 2, switch transformer 3, permanent power circuit 4 and the constant-voltage control circuit 5 being linked in sequence, and wherein power starting circuit 1 is connected with switch transformer 3, constant-voltage control circuit 5.
As shown in Figure 2; the utility model adopts domestic switching power source chip CR6842; this IC integrated circuit has totem drive circuit and the mode PWM controlled device circuit of optimization, and wherein PWM controller circuitry comprises hunting of frequency generator circuit and short-circuit protection, overcurrent protection, overpower protection, overvoltage crowbar.The frequency jitter being produced by vibration, can improve EMI(electromagnetic interference) characteristic.In order to obtain good efficiency, this power supply allows CR6842 be operated in PWM pattern when heavy duty or medium load, and when load reduces, the oscillator operating frequency of switching power source chip CR6842 reduces gradually, is finally stabilized in 10KHZ left and right.When unloaded and underloading, power starting circuit work is low-power consumption green model, and because direct current machine drives load often in discontinuous operation state, low-power consumption green model can effectively reduce power standby power consumption.
Realize the switching power circuit of super wide voltage input, must have the power starting circuit with under-voltage locking and OCP compensation.As shown in Figure 2, power starting circuit 1 is after traditional rectification, on start-up circuit, to carry out improved power starting circuit, makes its wide voltage power supply that is applicable to 70-320VAC scope and can reliably start.Alternating current is through rectifier bridge output dc voltage, one road rectifying and wave-filtering is by diode D8, R7 is added to switching power source chip (model is CR6842) VDD pin, starting resistor (this pin is done and started pin in this power supply) is provided, another road is after rectifying and wave-filtering, through R1, R2 forms after startup bleeder circuit dividing potential drop, is added to 3 pin (this pin is done OCP compensation at this power supply) of power supply chip via R3 resistance.Make power supply under wide voltage power supply, have certain OCP compensate function.
The operation principle of power starting circuit 1 is as follows: when power supply electrifying is started shooting, process rectifying and wave-filtering+300V voltage one tunnel process D8, R7, be added to 7 pin of power supply chip, due to the external electrochemical capacitor C3 of 7 pin, capacitor C 3 both end voltage can not be suddenlyd change, and make 7 pin voltages increase gradually, when voltage rises to 16.5V, reach the starting resistor VTH(on of chip) when (representative value 16.5V), chip is just activated and drives whole power-supply system normal operation.Another road is through R1, and R2 forms and starts bleeder circuit and divide to be pressed in and by R3, be added to the OCP that chip 3 pin realize under wide voltage and compensate.It is anodal that two-way electric current is finally added to the C3 of chip 7 pin peripheries, for C3 charging is until vdd terminal mouth voltage reaches the starting resistor VTH(on of chip) chip is just activated and drives whole power-supply system normal operation when (representative value 16.5V).
As shown in Figure 3, composite absorbent RCD clamp circuit is that its circuit comprises the circuit being comprised of D2, D4, C4, R10, R9, C5, R12, R13 circuit element for preventing that primary coil leakage inductance from producing the circuit that magnetic energy damages circuit element.For flyback Switching Power Supply, due to the existence of Switching Power Supply leakage inductance and the impact of other distributed constant, inverse-excitation type switch power-supply can produce very large peak voltage at switching tube Q1 shutdown moment.Based on the law of electromagnetic induction, be stored in outside electromagnetic energy on coupling inductor U1 absorbed by secondary load circuit, only at cut-off point (on electronic switching tube Q1), there is the magnetic energy being produced by leakage inductance, evoke high voltage, be enough to puncture electronic switching tube Q1, the normal operation of power supply in serious threat.Must take measures it to suppress for this reason, at present, have a lot of methods to achieve this end.RCD clamp method is simple in structure, because cost of manufacture is low, is widely used.But common RCD clamp circuit is only applicable to the circuit below 150W, for Switching Power Supply more than 150W, the energy producing due to leakage inductance is larger, the energy that common RCD clamp circuit cannot effectively produce leakage inductance absorbs, this reason causes single-end flyback switching power supply difficult design more than 150W just, and the utility model Switching Power Supply power output maximum will arrive 240W, so must use the reliable and stable work of composite absorbent RCD clamp circuit ability in the utility model.
Composite absorbent RCD clamp circuit operation principle is as follows: when switching tube (field effect transistor 11N80) Q1 conducting, meeting stored energy between switch transformer T1 armature winding two ends, when switching tube, Q1 closes, the energy that armature winding stores will be transferred to secondary winding output, but the energy in the leakage inductance of primary winding can not be delivered to secondary winding, the moment that energy in transformer leakage inductance will turn-off at switching tube Q1, by C4, R10, R9, C5, R13, the circuit that R12 forms absorbs, transient voltage suppressor diode (TVS) D2 is responsible for clamp on a small quantity not by C4, R10, R9, C5, R13, the peak voltage that R12 absorbs, make switching tube safer, the composite absorbent RCD clamp circuit that this circuit is relatively traditional, its absorbable energy is larger, applicable load is larger, scope is more variable, reliability is higher.
As shown in Figure 6, this switching power circuit also has two control loops, i.e. permanent power circuit and constant-voltage control circuit.In low input situation; under 80VAC supply voltage input condition; motor start-up electric current is larger; if at this moment electric power outputting current is not limited; power supply is easy to enter overcurrent protection state; must limit and make its power supply when the electric motor starting enter permanent power rating electric power outputting current in this case; when while being electric motor starting, electric current surpasses power supply output maximum current; switch power supply drops; power supply enters permanent power rating; until electric motor starting completes, power supply enters pressure constant state again.
Permanent power circuit as shown in Fig. 4 a, Fig. 4 b; the permanent power circuit being formed by power conversion chip (model is LM7805CT) IC4, C11, R16 current sampling resistor, R19, triode Q2, R21, optocoupler U1; its effect is to enter in permanent power bracket when output current surpasses power supply output maximum Switching Power Supply in season; so that motor starts smoothly, there is not the problem of electric motor starting current protection.
As shown in Figure 5, constant-voltage control circuit consists of optocoupler IC2, resistance R 17, R18, shunt reference source (model is TL431A) IC3, R20, C9, R22, R23, R24, its effect is when output current is in power supply rated current output area, makes Switching Power Supply be operated within the scope of constant voltage.
Claims (5)
1. be applicable to the wide input voltage inverse-excitation type switch power-supply that direct current machine drives, it is characterized in that comprising: the power starting circuit being linked in sequence (1), clamp circuit (2), switch transformer (3), permanent power circuit (4) and constant-voltage control circuit (5), power starting circuit (1) is connected with switch transformer (3), constant-voltage control circuit (5).
2. the wide input voltage inverse-excitation type switch power-supply that is applicable to direct current machine driving according to claim 1, is characterized in that: described power starting circuit (1) adopts switching power source chip; The reference input of switching power source chip is connected with DC power supply by resistance, the power end of switching power source chip is connected with DC power supply by resistance R 7, diode D8, also by diode D3, resistance R 14, diode D6, be connected feedback winding other end ground connection with feedback winding one end of switch transformer (3).
3. the wide input voltage inverse-excitation type switch power-supply that is applicable to direct current machine driving according to claim 1, is characterized in that: described clamp circuit (2) comprises a plurality of resistance and diode; DC power supply is connected with armature winding one end of switch transformer (3), also by diode D2, the D4 being linked in sequence, is connected with the armature winding other end, and D2 the two poles of the earth are connected with the parallel circuits of resistance and electric capacity, and described parallel circuits is series resistance also; The armature winding other end of switch transformer (3) is also connected with the D utmost point of switching tube Q1, the S utmost point of Q1 is connected with the switching power source chip overcurrent sample end of power starting circuit (1), and the G utmost point is connected with switching power source chip drive output by the parallel circuits of resistance and diode.
4. the wide input voltage inverse-excitation type switch power-supply that is applicable to direct current machine driving according to claim 1, is characterized in that: described permanent power circuit (4) comprises resistance, triode Q2 and photoelectrical coupler U1; One end of the secondary winding of switch transformer (3) is connected with the emitter of triode Q2, also by resistance R 16, R19, be connected with the base stage of Q2, the collector electrode of Q2 is connected with the light-emitting diodes tube cathode of photoelectrical coupler U1 through resistance R 21, and the anode of photodiode is connected with constant-voltage control circuit (5); The intermediate node of resistance R 16, R19 is as ground end, and the other end of the secondary winding of switch transformer (3) is connected with positive voltage and after inductance L 1 is connected with positive supply, as positive voltage output end, is connected with motor; Between the two ends of secondary winding, be connected with capacitor C 6.
5. the wide input voltage inverse-excitation type switch power-supply that is applicable to direct current machine driving according to claim 1, is characterized in that: described constant-voltage control circuit (5) comprises photoelectrical coupler IC2, resistance and electric capacity; The photodiode minus earth of photoelectrical coupler IC2, anode is connected with the switching power source chip feedback end of power starting circuit (1), also, with the photodiode anodic bonding of permanent power circuit (4) photoelectrical coupler U1, between the negative electrode of the photodiode of photoelectrical coupler IC2 and anode, be connected with electric capacity; The light-emitting diodes tube anode of photoelectrical coupler IC2 is connected with positive voltage, negative electrode is connected with the negative electrode of shunt reference source IC3, the plus earth of shunt reference source, with reference to the utmost point, by resistance R 22, be connected with positive supply, also, by resistance R 23, R24 ground connection, between the reference utmost point of shunt reference source and negative electrode, be in series with resistance R 20 and capacitor C 9; Between positive supply and ground, be in series with resistance R 26 and light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320544893.7U CN203457054U (en) | 2013-09-03 | 2013-09-03 | Wide input voltage flyback switching power supply suitable for DC motor driving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320544893.7U CN203457054U (en) | 2013-09-03 | 2013-09-03 | Wide input voltage flyback switching power supply suitable for DC motor driving |
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| Publication Number | Publication Date |
|---|---|
| CN203457054U true CN203457054U (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320544893.7U Expired - Lifetime CN203457054U (en) | 2013-09-03 | 2013-09-03 | Wide input voltage flyback switching power supply suitable for DC motor driving |
Country Status (1)
| Country | Link |
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| CN (1) | CN203457054U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426377A (en) * | 2013-09-03 | 2015-03-18 | 聚龙股份有限公司 | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor |
| CN106921303B (en) * | 2017-03-13 | 2023-08-11 | 深圳市安姆伯科技有限公司 | Switching power supply transformer |
-
2013
- 2013-09-03 CN CN201320544893.7U patent/CN203457054U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426377A (en) * | 2013-09-03 | 2015-03-18 | 聚龙股份有限公司 | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor |
| CN104426377B (en) * | 2013-09-03 | 2017-02-08 | 聚龙股份有限公司 | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor |
| CN106921303B (en) * | 2017-03-13 | 2023-08-11 | 深圳市安姆伯科技有限公司 | Switching power supply transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: JULONG CO., LTD. Free format text: FORMER NAME: LIAONING JULONG FINANCIAL EQUIPMENT CORP. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 114051, Anshan Province, east of the eastern part of the town of Liaoning Qianshan Road No. 308 Patentee after: JULONG CO., LTD. Address before: 114051, Anshan Province, east of the eastern part of the town of Liaoning Qianshan Road No. 308 Patentee before: Liaoning Julong Financial Equipment Co., Ltd. |