CN101404455A - Three terminal type power switch power supply circuit - Google Patents
Three terminal type power switch power supply circuit Download PDFInfo
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- CN101404455A CN101404455A CNA2008102172204A CN200810217220A CN101404455A CN 101404455 A CN101404455 A CN 101404455A CN A2008102172204 A CNA2008102172204 A CN A2008102172204A CN 200810217220 A CN200810217220 A CN 200810217220A CN 101404455 A CN101404455 A CN 101404455A
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Abstract
The invention relates to a circuit of a three-terminal type power switching power supply, comprising a transformer T1, a rectification circuit connected with the terminal 1 at the primary side of the transformer T1, an output circuit connected with the secondary side of the transformer T1 and a feedback circuit which is connected with the terminal 3 at the primary side of the transformer T1 and the feedback terminal JK of the output circuit; wherein, the three-terminal type power switching power supply also comprises a three-terminal chip; the feedback signal control terminal VC of the three-terminal chip is connected with the output terminal of the feedback circuit, the chip high voltage terminal VD of the three-terminal type chip is connected with the rectification circuit and the terminal 2 at the primary side of the transformer, and the ground terminal VS thereof is connected with the terminal 4 at the primary side of the transformer T1. The invention has the advantage that the requirements can be satisfied by simple Y-shaped three-pin encapsulation, thus lowering the cost and being convenient for use.
Description
Technical field
The present invention relates to semiconductor integrated circuit, more particularly, relate to a kind of three terminal type power switch power supply circuit.
Background technology
When selecting the components and parts of suitable power power-supply and corresponding framework, overriding concern be the cost of making.Typical inverse-excitation type switch power-supply is not integrated in the chip owing to switching power tube, at least need following pin: an earth potential pin VS (also will distinguish Power Groud and simulation ground sometimes), the pin FB of a low pressure transmission feedback signal, a switching power tube grid-control making pin GATE, the high pressure pin VDD (using adjuster (REGULATOR) that high pressure is become inner low-tension supply usually) of a required internal electric source when producing the chip operate as normal gathers enough 8 pin and also can increase the compensation pin that some connect peripheral cell to adapt to the encapsulation of 8 pin so be generally.Fig. 1 and Fig. 2 show the circuit diagram of the inverse-excitation type switch power-supply that adopts electric resistance partial pressure feedback and optical coupling feedback respectively.
Because pin of chip is few more, cost is also just low more naturally.And the power switch power supply can be integrated in the chip by the switching mode circuit with large amount of complex and has more competitiveness.
Therefore, need a kind of desirable three terminal type power switch power supply circuit.
Summary of the invention
The technical problem to be solved in the present invention is, the defective too much at the chip pin of prior art, that cost is too high provides a kind of desirable three terminal type power switch power supply circuit.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of three terminal type power switch power supply circuit, comprise transformer T1, be connected to the rectification circuit of the former limit of described transformer T1 1 end, be connected to the output circuit of described transformer T1 secondary and the feedback circuit of the feedback end JK of former limit 3 ends that are connected to described transformer T1 and output circuit, wherein, described three terminal type power switch power supply circuit also comprises the trifocal chip, the feedback signal control end VC of described trifocal chip is connected to the output of described feedback circuit, the chip high voltage end VD of described trifocal chip is connected to rectification circuit and the former limit of described transformer 2 ends, and the earth terminal VS of described trifocal chip links to each other with former limit 4 ends of described transformer T1.
In three terminal type power switch power supply circuit of the present invention, described trifocal chip comprises: hysteresis comparator, internal high pressure charging module HVIS, the JFET pipe, MOSFET power tube and power tube control unit, the input of wherein said hysteresis comparator connects feedback signal control end VC and reference voltage VREF respectively, output connects the control end of internal high pressure charging module HVIS, the output of described internal high pressure charging module HVIS links to each other with the source electrode of JFET pipe, the drain electrode of described JFET pipe meets chip high voltage end VD, grid connects the earth terminal VS of described trifocal chip, the input of described power tube control unit connects feedback signal control end VC, output links to each other with the grid of described MOSFET power tube, and the drain electrode of described MOSFET power tube meets chip high voltage end VD, source electrode connects the earth terminal VS of described trifocal chip (300).
In three terminal type power switch power supply circuit of the present invention, described power tube control unit comprises oscillator OSC, rest-set flip-flop, PWM comparator and shunt regulon, described shunt regulon is sampled described feedback signal to obtain error level VERRO by feedback signal control end VC, described error level VERRO is used to cut the sawtooth waveforms that oscillator OSC produces, and described sawtooth waveforms converts the grid control signal that is used to control described MOSFET power tube to through PWM comparator and rest-set flip-flop.
In three terminal type power switch power supply circuit of the present invention, described rectification circuit comprises rectifier bridge, capacitor C 3, diode D6, D3, wherein said rectifier bridge is connected between the earth terminal VS of former limit 1 end of transformer T1 and described trifocal chip, the anode of diode D3 is connected to the negative electrode that the former limit of transformer T1 1 end, negative electrode are connected to diode D6, and the anode of described diode D6 is connected to chip high voltage end VD, and described capacitor C 3 is in parallel with described diode D3.
In three terminal type power switch power supply circuit of the present invention, described diode D6 is a Ultrafast recovery diode.
In three terminal type power switch power supply circuit of the present invention, described output circuit comprises diode D2, voltage-stabiliser tube D4, the anode of wherein said diode D2 links to each other with secondary 5 ends of described transformer T1, the negative electrode of the negative electrode of described diode D2 and described voltage-stabiliser tube D4, the anode of described voltage-stabiliser tube D4 is connected to described feedback circuit.
In three terminal type power switch power supply circuit of the present invention, described feedback circuit comprises diode D5, optocoupler U1, resistance R 4, R3, capacitor C 7, the anode of wherein said diode D5 links to each other with the former limit of described transformer T1 3 ends, negative electrode is connected to the reception collector electrode of described optocoupler U1, the receiving terminal emitter of described optocoupler U1 is connected to the feedback signal control end VC of described trifocal chip, the transmitting terminal negative electrode of described optocoupler U1 links to each other with ground VSS, the transmitting terminal anode of described optocoupler U1 is connected to the anode of described voltage-stabiliser tube D4 through resistance R 4, and the series circuit of described resistance R 3 and capacitor C 7 is connected between the earth terminal VS of the receiving terminal emitter of described optocoupler U1 and described trifocal chip.
Implement three terminal type power switch power supply circuit of the present invention, have following beneficial effect: the feedback signal terminal vc multiplexing that will embody feedback quantity is the chip internal power supply, chip high voltage end VD is multiplexed with the high pressure pin of internal electric source when producing the chip operate as normal when powering on by the internal high pressure charging module HVIS that joins with chip high voltage end VD, and close high-voltage charging module HVIS after powering on finishing, keep internal electric source by the system feedback amount and be in normal level, add earth terminal VS, the present invention only needs simple Y type tripod encapsulation just can meet the demands, reduced cost, and need not join power tube outward, be user-friendly to.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit theory diagrams of first embodiment of the inverse-excitation type switch power-supply of prior art;
Fig. 2 is the circuit theory diagrams of second embodiment of the inverse-excitation type switch power-supply of prior art;
Fig. 3 is the theory diagram of first embodiment of three terminal type power switch power supply circuit of the present invention;
Fig. 4 is the theory diagram of trifocal chip of the present invention;
Fig. 5 is the circuit theory diagrams of second embodiment of three terminal type power switch power supply circuit of the present invention.
Embodiment
As shown in Figure 3, three terminal type power switch power supply circuit of the present invention, comprise transformer T1, be connected to the rectification circuit 100 of the former limit of described transformer T1 1 end, be connected to the output circuit 400 of described transformer T1 secondary and the feedback circuit 200 of the feedback end JK of former limit 3 ends that are connected to described transformer T1 and output circuit 400, wherein, described three terminal type power switch power supply circuit also comprises trifocal chip 300, the feedback signal control end VC of described trifocal chip 300 is connected to the output of described feedback circuit 200, the chip high voltage end VD of described trifocal chip 300 is connected to rectification circuit 100 and the former limit of described transformer 2 ends, and the earth terminal VS of described trifocal chip 300 links to each other with former limit 4 ends of described transformer T1.
In each embodiment of the present invention, any functional circuit and module that described rectification circuit, output circuit and feedback circuit all can adopt those skilled in the art to know are implemented its function.In another preferred embodiment of the present invention, described feedback circuit can also be a resistance reaction type circuit.
Fig. 4 is the theory diagram of trifocal chip of the present invention.As shown in Figure 4, described trifocal chip 300 comprises: hysteresis comparator 301, internal high pressure charging module HVIS, the JFET pipe, MOSFET power tube and power tube control unit 302, the input of wherein said hysteresis comparator 301 connects feedback signal control end VC and reference voltage VREF respectively, output connects the control end of internal high pressure charging module HVIS, the output of described internal high pressure charging module HVIS links to each other with the source electrode of JFET pipe, the drain electrode of described JFET pipe meets chip high voltage end VD, grid connects the earth terminal VS of described trifocal chip 300, the input of described power tube control unit 302 connects feedback signal control end VC, output links to each other with the grid of described MOSFET power tube, and the drain electrode of described MOSFET power tube meets chip high voltage end VD, source electrode connects the earth terminal VS of described trifocal chip (300).
In the present embodiment, described power tube control unit 302 comprises oscillator OSC, rest-set flip-flop, PWM comparator and shunt regulon 303, described shunt regulon 303 is sampled described feedback signal to obtain error level VERRO by feedback signal control end VC, described error level VERRO is used to cut the sawtooth waveforms that oscillator OSC produces, and described sawtooth waveforms converts the grid control signal that is used to control described MOSFET power tube to through PWM comparator and rest-set flip-flop.
Fig. 5 is the circuit theory diagrams of second embodiment of three terminal type power switch power supply circuit of the present invention.Trifocal chip wherein can be with reference to shown in Figure 4.As shown in Figure 5, AC1, AC2 indirect communication civil power after the rectifier bridge rectification, filter big ripple by capacitor C 1 and obtain direct current signal L1.Under initial condition, trifocal chip 300 is not worked, the MOSFET power tube turn-offs, the voltage of chip high voltage end VD can rise to the D. C. value that equates with L1 place voltage, this time, JFET pipe and high-voltage charging module HVIS can constitute one and be similar to constant current I1 and (be subjected to the voltage influence on the chip high voltage end VD little, voltage on the chip high voltage end VD is big more, the JFET pipe is severe more with regard to pinch off) circuit of charging structure, the voltage of feedback signal control end VC is that slope rises with I1/C7, along with the rising of the voltage of feedback signal control end VC, benchmark is also progressively set up.After the voltage of feedback signal control end VC is higher than the VREF reference voltage of hysteresis comparator 301, turn-off high-voltage charging module HVIS, trifocal chip 300 beginning operate as normal, shunt regulator module 303 can obtain an error level VERRO according to the voltage of sampled feedback signal control end VC, be in the sawtooth waveforms of the oscillator OSC module generation of operate as normal this moment in order to cutting, and through producing the square wave (the low more then duty ratio of voltage at this feedback signal control end VC place can be big more) of the certain duty ratio relevant behind PWM comparator and the rest-set flip-flop with the feedback signal of feedback signal control end VC, the switch motion of this rectangular wave drive MOSFET power tube, when the MOSFET power tube turn-offs, can see, the former limit winding current of transformer T1 is wanted to reduce, so between chip high voltage end VD and L1, produce an induced electromotive force, this moment, the voltage of chip high voltage end VD can be up to 700V, 3 transient voltage inhibitory action of diode D3 and capacitor C among the figure.For reducing loss, diode D6 can be Ultrafast recovery diode.The peak voltage that is produced by high-frequency electrical depressor leakage inductance when diode D3, capacitor C 3 are turn-offed to absorb trifocal chip 300 with loop of winding formation, former limit of diode D6, transformer T1 plays the drain electrode protective effect.Along with the voltage on the chip high voltage end VD raises, the voltage that 5 ends of transformer T1 secondary winding are also pressed 5 ends of turn ratio rising transformer T1 secondary winding raises, and by after the rectification of diode D2, capacitor C 2 big capacitor C 2 being carried out energy supplement, secondary 3 ends are also guaranteed optocoupler U1 operate as normal for height simultaneously, and D4 is a voltage-stabiliser tube.If the junction voltage of pressure drop on the negligible resistance R4 and diode D2, output will be stabilized near the puncture voltage of voltage-stabiliser tube D4 so.R4 is the current-limiting resistance of the transmitting terminal place light-emitting diode of optocoupler U1, also determines the gain of radio circuit simultaneously.Optocoupler U1 scalable is to the charging current size of feedback signal control end VC.Diode D5, capacitor C 5 strobe, and resistance R 3 is the ESR of capacitor C 7.Can introduce a zero point loop is compensated to some extent herein, the charging current of feedback will cause the slight change of the voltage of feedback signal control end VC, separate this feedback quantity of reflection in the square wave of new duty ratio by the shunt regulator module in the chip 303.The energy value that replenishes and duty ratio and major-minor limit umber of turn are than relevant.If the voltage of feedback signal control end VC is lower, it is big that duty ratio then becomes, MOSFET power tube ON time is elongated, because voltage=0 on the chip high voltage end VD, the former limit of transformer T1 winding both end voltage is constant always to be VL1, its electric current can rise energy storage 1/2Li by (VL1/ master limit inductance) this slope
2Can become big, be discharged into the energy that capacitor C 2 replenishes and also just become many when the MOSFET power tube closes to have no progeny like this, VOUT can slightly rise, the light-emitting diode of the transmitting terminal of optocoupler U1 can be brighter, the electric current of the charging of receiving terminal induction also can become bigger, thereby the voltage at feedback signal control end VC place is pulled back, form the feedback stability loop.
Implement three terminal type power switch power supply circuit of the present invention, with the feedback signal terminal vc multiplexing that embodies feedback quantity is the chip internal power supply, chip high voltage end VD is multiplexed with the high pressure pin of internal electric source when producing the chip operate as normal when powering on by the internal high pressure charging module HVIS that joins with chip high voltage end VD, and close high-voltage charging module HVIS after powering on finishing, keep internal electric source by the system feedback amount and be in normal level, add earth terminal VS, only need simple Y type tripod encapsulation just can meet the demands, reduced cost, and need not join power tube outward, be user-friendly to.
Though the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.
Claims (7)
1, a kind of three terminal type power switch power supply circuit, comprise transformer T1, be connected to the rectification circuit (100) of the former limit of described transformer T1 1 end, be connected to the output circuit (400) of described transformer T1 secondary and be connected to former limit 3 ends of described transformer T1 and the feedback circuit (200) of the feedback end JK of output circuit (400), it is characterized in that, described three terminal type power switch power supply circuit also comprises trifocal chip (300), the feedback signal control end VC of described trifocal chip (300) is connected to the output of described feedback circuit (200), the chip high voltage end VD of described trifocal chip (300) is connected to rectification circuit (100) and the former limit of described transformer 2 ends, and the earth terminal VS of described trifocal chip (300) links to each other with former limit 4 ends of described transformer T1.
2, three terminal type power switch power supply circuit according to claim 1, it is characterized in that, described trifocal chip (300) comprising: hysteresis comparator (301), internal high pressure charging module HVIS, the JFET pipe, MOSFET power tube and power tube control unit (302), the input of wherein said hysteresis comparator (301) connects feedback signal control end VC and reference voltage VREF respectively, output connects the control end of internal high pressure charging module HVIS, the output of described internal high pressure charging module HVIS links to each other with the source electrode of JFET pipe, the drain electrode of described JFET pipe meets chip high voltage end VD, grid connects the earth terminal VS of described trifocal chip (300), the input of described power tube control unit (302) connects feedback signal control end VC, output links to each other with the grid of described MOSFET power tube, and the drain electrode of described MOSFET power tube meets chip high voltage end VD, source electrode connects the earth terminal VS of described trifocal chip (300).
3, three terminal type power switch power supply circuit according to claim 2, it is characterized in that, described power tube control unit (302) comprises oscillator OSC, rest-set flip-flop, PWM comparator and shunt regulon (303), described shunt regulon (303) passes through feedback signal control end VC sampled feedback signal to obtain error level VERRO, described error level VERRO is used to cut the sawtooth waveforms that oscillator OSC produces, and described sawtooth waveforms converts the grid control signal that is used to control described MOSFET power tube to through PWM comparator and rest-set flip-flop.
4, three terminal type power switch power supply circuit according to claim 2, it is characterized in that, described rectification circuit (100) comprises rectifier bridge, capacitor C 3, diode D6, D3, wherein said rectifier bridge is connected between the earth terminal VS of former limit 1 end of transformer T1 and described trifocal chip (300), the anode of diode D3 is connected to the negative electrode that the former limit of transformer T1 1 end, negative electrode are connected to diode D6, the anode of described diode D6 is connected to chip high voltage end VD, and described capacitor C 3 is in parallel with described diode D3.
5, three terminal type power switch power supply circuit according to claim 4 is characterized in that, described diode D6 is a Ultrafast recovery diode.
6, three terminal type power switch power supply circuit according to claim 2, it is characterized in that, described output circuit (400) comprises diode D2, voltage-stabiliser tube D4, the anode of wherein said diode D2 links to each other with secondary 5 ends of described transformer T1, the negative electrode of the negative electrode of described diode D2 and described voltage-stabiliser tube D4, the anode of described voltage-stabiliser tube D4 are connected to described feedback circuit (200).
7, three terminal type power switch power supply circuit according to claim 6, it is characterized in that, described feedback circuit (200) comprises diode D5, optocoupler U1, resistance R 4, R3, capacitor C 7, the anode of wherein said diode D5 links to each other with the former limit of described transformer T1 3 ends, negative electrode is connected to the reception collector electrode of described optocoupler U1, the receiving terminal emitter of described optocoupler U1 is connected to the feedback signal control end VC of described trifocal chip (300), the transmitting terminal negative electrode of described optocoupler U1 links to each other with ground VSS, the transmitting terminal anode of described optocoupler U1 is connected to the anode of described voltage-stabiliser tube D4 through resistance R 4, and the series circuit of described resistance R 3 and capacitor C 7 is connected between the earth terminal VS of the receiving terminal emitter of described optocoupler U1 and described trifocal chip (300).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217220A CN101404455B (en) | 2008-11-03 | 2008-11-03 | Three terminal type power switch power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217220A CN101404455B (en) | 2008-11-03 | 2008-11-03 | Three terminal type power switch power supply circuit |
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| CN101404455A true CN101404455A (en) | 2009-04-08 |
| CN101404455B CN101404455B (en) | 2010-05-12 |
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| CN200810217220A Expired - Fee Related CN101404455B (en) | 2008-11-03 | 2008-11-03 | Three terminal type power switch power supply circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553284A (en) * | 2016-03-07 | 2016-05-04 | 西安交通大学 | DC high-order energy-obtaining power supply with wide input voltage range |
| CN115441702A (en) * | 2022-11-08 | 2022-12-06 | 成都智融微电子有限公司 | Self-adaptive shielding time generation system applied to flyback power supply circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW328992B (en) * | 1997-03-17 | 1998-04-01 | Acer Peripherals Inc | Improved low power consumption electric power supply |
| WO2004010569A1 (en) * | 2002-07-19 | 2004-01-29 | Stmicroelectronics S.R.L. | Bootstrap circuit for switching power supplies |
| CN2852520Y (en) * | 2005-12-16 | 2006-12-27 | 冯长华 | Multifunctional universal three-terminal switch power supply module |
-
2008
- 2008-11-03 CN CN200810217220A patent/CN101404455B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553284A (en) * | 2016-03-07 | 2016-05-04 | 西安交通大学 | DC high-order energy-obtaining power supply with wide input voltage range |
| CN115441702A (en) * | 2022-11-08 | 2022-12-06 | 成都智融微电子有限公司 | Self-adaptive shielding time generation system applied to flyback power supply circuit |
| CN115441702B (en) * | 2022-11-08 | 2023-02-17 | 成都智融微电子有限公司 | Self-adaptive shielding time generation system applied to flyback power supply circuit |
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| CN101404455B (en) | 2010-05-12 |
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