CN102468761A - Switch power supply - Google Patents
Switch power supply Download PDFInfo
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- CN102468761A CN102468761A CN2010105488846A CN201010548884A CN102468761A CN 102468761 A CN102468761 A CN 102468761A CN 2010105488846 A CN2010105488846 A CN 2010105488846A CN 201010548884 A CN201010548884 A CN 201010548884A CN 102468761 A CN102468761 A CN 102468761A
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Abstract
The invention relates to a switch power supply which comprises an input circuit, a switching circuit, an energy conversion circuit and an output circuit which are sequentially connected with one another; the switch power supply further comprises an output detection circuit connected with the output circuit, and a feedback circuit connected with the output detection circuit, wherein the switching circuit comprises a triode T2 and a metal oxide semiconductor (MOS) tube Q1; a collector of the triode T2 is connected with the input circuit; an emitting electrode of the triode T2 is connected with a drain electrode of the MOS tube Q1; a base electrode of the triode T2 is connected with a power supply; a source electrode of the MOS tube Q1 is in ground connection; and a grid electrode of the MOS tube Q1 is connected with the output of the feedback circuit. The switch power supply is capable of realizing a switching tube combination which is large in current, high in voltage and easy to drive by combining a large current dual-polarity transistor and the low-voltage MOS tube.
Description
Technical field
The present invention relates to a kind of Switching Power Supply, more particularly, relate to a kind of Switching Power Supply with big electric current, high voltage and the combination of easy switch driven pipe.
Background technology
The switching tube of traditional Switching Power Supply is a metal-oxide-semiconductor; But because the present technology of metal-oxide-semiconductor is difficult to accomplish very high voltage and big electric current; Surpass 1KV or electric current hundreds of ampere-hour at voltage, just be difficult to find suitable metal-oxide-semiconductor model, even find suitable types; Price also is to satisfy the requirement of commercial application, so must a kind of unit switch mode of demand satisfy this application.
Summary of the invention
The technical problem that the present invention will solve is; Use metal-oxide-semiconductor to be difficult to accomplish to satisfy simultaneously the defective of the low requirement of high voltage, big electric current and price as switching tube to the Switching Power Supply of prior art; A kind of Switching Power Supply of using big electric current, high voltage and the combination of easy switch driven pipe is provided, and this switching tube combination realizes through the combination of big current bi-pole property transistor and low pressure metal-oxide-semiconductor.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of Switching Power Supply; Comprise the input circuit, switching circuit, power conversion circuits and the output circuit that connect successively; Said Switching Power Supply also comprises output detection circuit that is connected with said output circuit and the feedback circuit that is connected with said output detection circuit; It is characterized in that said switching circuit comprises triode T2 and metal-oxide-semiconductor Q1, the collector electrode of said triode T2 is connected with said input circuit; The emitter of said triode T2 is connected with the drain electrode of said metal-oxide-semiconductor Q1; The base stage of said triode T2 connects power supply, the source ground of said metal-oxide-semiconductor Q1, and the grid of said metal-oxide-semiconductor Q1 is connected with the output of said feedback circuit.
In Switching Power Supply of the present invention, said switching circuit also comprises and is used to avoid due to voltage spikes that said power conversion circuits causes that first of the damage of said triode T2 is absorbed buffer circuit.
In Switching Power Supply of the present invention, said output detection circuit comprises that the benchmark that the sampling voltage of pressure sampling circuit, the said pressure sampling circuit of feedback of the output voltage of the said output circuit of taking a sample is given the optocoupler U1 of said feedback circuit and the benchmark of said pressure sampling circuit is set is provided with circuit.
In Switching Power Supply of the present invention; Said benchmark is provided with circuit and comprises chip U3 and capacitor C 11; Said chip U3 is TL431; The reference utmost point of said chip U3 is connected with an end of said capacitor C 11, and the other end of the negative electrode of said chip U3 and said capacitor C 11 is connected the plus earth of said chip U3 respectively at said optocoupler U1.
In Switching Power Supply of the present invention, said feedback circuit comprises the PWM generation chip that sends pwm signal according to the sampling voltage of said optocoupler U1 feedback, and the signal output part that said PWM produces chip is connected with the grid of said metal-oxide-semiconductor Q1.
In Switching Power Supply of the present invention; Said feedback circuit comprises that also starting said PWM produces the chip enable circuit of chip and keep said PWM to produce the power supply holding circuit of the operating state of chip, and said chip enable circuit is connected with the VCC end of said PWM generation chip respectively with said power supply holding circuit.
In Switching Power Supply of the present invention, said input circuit comprises input rectification circuit and input filter circuit.
In Switching Power Supply of the present invention, said output circuit comprises output rectification circuit and output filter circuit.
In Switching Power Supply of the present invention; Said output rectification circuit be two with the Schottky rectifier diode D2 that are in parallel, said output circuit also comprises and is used to avoid due to voltage spikes that said power conversion circuits causes that second of the damage of said Schottky rectifier diode D2 is absorbed buffer circuit.
In Switching Power Supply of the present invention, said input circuit comprises input rectification circuit and input filter circuit; Said output circuit comprises output rectification circuit and output filter circuit; Said output rectification circuit is two Schottky rectifier diode D2 that are in parallel together, and said output circuit comprises that also the due to voltage spikes that is used to avoid said power conversion circuits to cause absorbs buffer circuit to second of said Schottky rectifier diode D2 damage.
The Switching Power Supply of embodiment of the present invention has following beneficial effect: the combination through big current bi-pole property transistor and low pressure metal-oxide-semiconductor realizes big electric current, high voltage and the combination of easy switch driven pipe.
The due to voltage spikes that the setting of the first absorption buffer circuit avoids power conversion circuits to cause damages triode T2.Being provided with of output detection circuit can realize better output sampling.What benchmark was provided with circuit is arranged so that reference data is more stable, is not vulnerable to external interference.Feedback circuit adopts PWM to produce chip and produces multiple different feedback signal through the control pulsewidth.The power supply holding circuit makes that the power supply of PWM generation chip is more stable.Input rectification circuit and input filter circuit convert the alternating current of input into more level and smooth direct current.Output rectification circuit and output filter circuit make the direct current of output more steady.The due to voltage spikes that the second absorption buffer circuit avoids power conversion circuits to cause damages Schottky rectifier diode D2.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the detailed circuit diagram of the preferred embodiment of Switching Power Supply of the present invention;
Fig. 2 is the structural representation of first preferred embodiment of Switching Power Supply of the present invention;
Fig. 3 is the structural representation of second preferred embodiment of Switching Power Supply of the present invention;
Fig. 4 is the structural representation of the 3rd preferred embodiment of Switching Power Supply of the present invention;
Fig. 5 is the structural representation of the 4th preferred embodiment of Switching Power Supply of the present invention;
Fig. 6 is the structural representation of the 5th preferred embodiment of Switching Power Supply of the present invention;
Fig. 7 is the structural representation of the 6th preferred embodiment of Switching Power Supply of the present invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As in the structural representation of first preferred embodiment of Fig. 1, the Switching Power Supply of the present invention shown in 2 and the relevant detailed circuit diagram; The present invention constructs a kind of Switching Power Supply; This Switching Power Supply comprises input circuit 1, switching circuit 2, power conversion circuits 3 and the output circuit 4 that connects successively, and said Switching Power Supply also comprises output detection circuit 5 that is connected with said output circuit 4 and the feedback circuit 6 that is connected with said output detection circuit 5, wherein; Switching circuit 2 comprises triode T2 and metal-oxide-semiconductor Q1; The collector electrode of triode T2 is connected with input circuit 1, and the emitter of triode T2 is connected with the drain electrode of metal-oxide-semiconductor Q1, and the base stage of triode T2 connects power supply; The source electrode of metal-oxide-semiconductor Q1 is through resistance R 12 ground connection, and the grid of metal-oxide-semiconductor Q1 is connected with the output of said feedback circuit 6.As shown in Figure 1, triode T2 and metal-oxide-semiconductor Q1 form the switching tube combination of this Switching Power Supply, when Switching Power Supply of the present invention is used; Feedback circuit 6 sends the switch of PWM drive signal control metal-oxide-semiconductor Q1; Thereby control the break-make of the electric current of triode T2 emitter, finally control the break-make of whole switching circuit 2, the base stage of triode T2 connects power supply all the time; So do not exist base current to extract problem, improved switching speed; Triode T2 and metal-oxide-semiconductor Q1 series connection simultaneously because triode T2 just can bear high pressure, so whole switch combination device also just can be high pressure resistant, thereby has realized big electric current, high voltage and the combination of easy switch driven pipe.
As in the structural representation of second preferred embodiment of Fig. 1, the Switching Power Supply of the present invention shown in 3 and the relevant detailed circuit diagram; Switching circuit 2 comprises that also first absorbs buffer circuit 21, the first and absorb buffer circuits 21 and be used to avoid the damage to triode T2 of due to voltage spikes that power conversion circuits 3 causes.As shown in Figure 1; First absorbs buffer circuit 21 is made up of capacitor C 2, resistance R 3 and diode D5; The anode of diode D5 is connected with the elementary output of power conversion circuits 3; The negative electrode of diode D5 is connected with an end of capacitor C 2 and an end of resistance R 3 respectively, and the other end of the other end of capacitor C 2 and resistance R 3 is connected with the elementary input of power conversion circuits 3 respectively.In transfer process, produced due to voltage spikes like energy change-over circuit 3 (like transformer); At this moment diode D5 will conducting; Play the certain absorption cushioning effect through capacitor C 2 and 3 pairs of due to voltage spikes of resistance R; When power conversion circuits 3 normal conversion, diode D5 ends, and power conversion circuits 3 is through triode T2, metal-oxide-semiconductor Q1 and resistance R 12 back ground connection.Being provided with like this can avoid due to voltage spikes directly to be carried in the damage that causes triode T2 on the triode T2.
As in the structural representation of the 3rd preferred embodiment of Fig. 1, the Switching Power Supply of the present invention shown in 4 and the relevant detailed circuit diagram, output detection circuit 5 comprises that pressure sampling circuit 51, optocoupler U1 and benchmark are provided with circuit 52.Pressure sampling circuit 51 be used to the to take a sample output voltage of said output circuit 4, optocoupler U1 are used to feed back the sampling voltage of said pressure sampling circuit 51 and give said feedback circuit 6, and benchmark is provided with the benchmark that circuit 52 is used to be provided with said pressure sampling circuit 51.Benchmark is provided with circuit 52 and comprises chip U3 and capacitor C 11, and chip U3 is TL431, and the reference utmost point of chip U3 is connected with an end of capacitor C 11, and the other end of the negative electrode of chip U3 and capacitor C 11 is connected the plus earth of chip U3 respectively at optocoupler U1.As shown in Figure 1, pressure sampling circuit 51 comprises resistance R 11 and resistance R 13, and the sampling voltage of pressure sampling circuit 51 feeds back to optocoupler U1 through resistance R 8; Optocoupler U1 provides the passage of Signal Spacing transmission; Sampling voltage is fed back to feedback circuit 6, and the reference utmost point of chip U3 is connected with an end of capacitor C 11, offers the reference voltage of an end 2.5V of capacitor C 11; Make reference data more stable, be not vulnerable to external interference and influence the effect of feedback.
As in the structural representation of the 4th preferred embodiment of Fig. 1, the Switching Power Supply of the present invention shown in 5 and the relevant detailed circuit diagram; Feedback circuit 6 comprises that PWM produces chip, chip enable circuit 61 and power supply holding circuit 62; PWM produces chip and is used for sending pwm signal according to the sampling voltage of optocoupler U1 feedback; Chip enable circuit 61 is used to start PWM and produces chip; Power supply holding circuit 62 is used to keep PWM to produce the operating state of chip, and the signal output part that PWM produces chip is connected with the grid of metal-oxide-semiconductor Q1, and chip enable circuit 61 is connected with the VCC end of PWM generation chip respectively with power supply holding circuit 62.As shown in Figure 1, chip U2 is that PWM produces chip, and PWM produces chip and comprises COMP, RT, VCC, GND, OUT, six pins of CS; COMP is used to import the sampling voltage of optocoupler U1 feedback, and RT is used for setting the switching frequency that PWM produces chip through resistance R 4, and VCC is used to insert the operating voltage that PWM produces chip; GND ground connection; OUT is according to the feedback signal output pwm signal of COMP input, and CS is a sheet choosing end, guarantees that PWM produces the normal operating conditions of chip.Resistance R 1, resistance R 2 and capacitor C 6 compositing chip start-up circuits 61, resistance R 6 and diode D3 are formed power supply holding circuit 62.When this PWM produces chip operation; Input circuit 1 produces chip through resistance R 1, resistance R 2 and capacitor C 6 to PWM starting resistor is provided; Send corresponding pwm signal according to the feedback of COMP end from the OUT end behind the PWM generation chip enable and open metal-oxide-semiconductor Q1 and then open switching circuit 2, after switching circuit 2 was opened, power supply holding circuit 62 was resistance R 6 and diode D3 conducting; Offer the working power that PWM produces chip, make that the power supply of PWM generation chip is more stable.
As in the structural representation of the 5th preferred embodiment of Fig. 1, the Switching Power Supply of the present invention shown in 6 and the relevant detailed circuit diagram, output circuit 4 comprises output rectification circuit 41 and output filter circuit 42.As shown in Figure 1, output rectification circuit 41 is rectifier bridge D1, and output filter circuit 42 comprises capacitor C 1, rectifier bridge D1 with the commercial power rectification be behind the unidirectional half-wave DC electricity in filtering through capacitor C 1, the half-wave DC electricity is filtered into more level and smooth direct current.
As in the structural representation of the 6th preferred embodiment of Fig. 1, the Switching Power Supply of the present invention shown in 7 and the relevant detailed circuit diagram; Output circuit 4 comprises that output rectification circuit 41, output filter circuit 42 and second absorb buffer circuit 43; Output rectification circuit 41 be two with the Schottky rectifier diode D2 that are in parallel, second absorbs buffer circuit 43 is used to avoid the damage to said Schottky rectifier diode D2 of due to voltage spikes that said power conversion circuits 3 causes.As shown in Figure 1, output filter circuit 42 comprises that capacitor C 4, capacitor C 5 and inductance L 1, the second absorb the capacitor C 3 and resistance R 5 that buffer circuit 43 comprises series connection.Schottky rectifier diode D2 with being in parallel can bear bigger electric current; But the easy reverse breakdown of Schottky rectifier diode D2; Therefore absorb buffer circuit 43 through parallel connection second and absorb the operate as normal that due to voltage spikes that buffering power conversion circuits 3 cause guarantees Schottky rectifier diode D2, through output rectification circuit 41 after-currents promptly exportable after output filter circuit 42 filtering.
The above is merely embodiments of the invention; Be not so limit claim of the present invention; Every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to be done, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. Switching Power Supply; Comprise the input circuit (1), switching circuit (2), power conversion circuits (3) and the output circuit (4) that connect successively; Said Switching Power Supply also comprises output detection circuit (5) that is connected with said output circuit (4) and the feedback circuit (6) that is connected with said output detection circuit (5); It is characterized in that said switching circuit (2) comprises triode T2 and metal-oxide-semiconductor Q1, the collector electrode of said triode T2 is connected with said input circuit (1); The emitter of said triode T2 is connected with the drain electrode of said metal-oxide-semiconductor Q1; The base stage of said triode T2 connects power supply, the source ground of said metal-oxide-semiconductor Q1, and the grid of said metal-oxide-semiconductor Q1 is connected with the output of said feedback circuit (6).
2. Switching Power Supply according to claim 1 is characterized in that, said switching circuit (2) also comprises and is used to avoid due to voltage spikes that said power conversion circuits (3) causes that first of the damage of said triode T2 is absorbed buffer circuit (21).
3. Switching Power Supply according to claim 1; It is characterized in that said output detection circuit (5) comprises that the benchmark that the pressure sampling circuit (51) of the output voltage of the said output circuit of sampling (4), the sampling voltage of feeding back said pressure sampling circuit (51) are given the optocoupler U1 of said feedback circuit (6) and the benchmark of said pressure sampling circuit (51) is set is provided with circuit (52).
4. Switching Power Supply according to claim 3; It is characterized in that; Said benchmark is provided with circuit (52) and comprises chip U3 and capacitor C 11, and said chip U3 is TL431, and the reference utmost point of said chip U3 is connected with an end of said capacitor C 11; The other end of the negative electrode of said chip U3 and said capacitor C 11 is connected respectively at said optocoupler U1, the plus earth of said chip U3.
5. Switching Power Supply according to claim 3; It is characterized in that; Said feedback circuit (6) comprises the PWM generation chip that sends pwm signal according to the sampling voltage of said optocoupler U1 feedback, and the signal output part that said PWM produces chip is connected with the grid of said metal-oxide-semiconductor Q1.
6. Switching Power Supply according to claim 5; It is characterized in that; Said feedback circuit (6) comprises that also starting said PWM produces the chip enable circuit (61) of chip and keep said PWM to produce the power supply holding circuit (62) of the operating state of chip, and said chip enable circuit (61) is connected with the VCC end of said PWM generation chip respectively with said power supply holding circuit (62).
7. Switching Power Supply according to claim 1 is characterized in that, said input circuit (1) comprises input rectification circuit and input filter circuit.
8. Switching Power Supply according to claim 1 is characterized in that, said output circuit (4) comprises output rectification circuit (41) and output filter circuit (42).
9. Switching Power Supply according to claim 8; It is characterized in that; Said output rectification circuit (41) be two with the Schottky rectifier diode D2 that are in parallel, said output circuit (4) also comprises and is used to avoid due to voltage spikes that said power conversion circuits (3) causes that second of the damage of said Schottky rectifier diode D2 is absorbed buffer circuit (43).
10. Switching Power Supply according to claim 5 is characterized in that, said input circuit (1) comprises input rectification circuit and input filter circuit; Said output circuit (4) comprises output rectification circuit (41) and output filter circuit (42); Said output rectification circuit (41) is two Schottky rectifier diode D2 that are in parallel together, and said output circuit (4) comprises that also the due to voltage spikes that is used to avoid said power conversion circuits (3) to cause absorbs buffer circuit (43) to second of said Schottky rectifier diode D2 damage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105488846A CN102468761A (en) | 2010-11-16 | 2010-11-16 | Switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105488846A CN102468761A (en) | 2010-11-16 | 2010-11-16 | Switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102468761A true CN102468761A (en) | 2012-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105488846A Pending CN102468761A (en) | 2010-11-16 | 2010-11-16 | Switch power supply |
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| CN (1) | CN102468761A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941791A (en) * | 2013-01-17 | 2014-07-23 | 常州隆辉照明科技有限公司 | A circuit for reference ground connection conversion |
| CN104935170A (en) * | 2014-03-21 | 2015-09-23 | 深圳市海洋王照明工程有限公司 | Switch power supply and lamp |
| CN113655363A (en) * | 2021-09-13 | 2021-11-16 | 东科半导体(安徽)股份有限公司 | On-line testing circuit for conduction voltage drop of main switching tube of switching power supply |
Citations (5)
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|---|---|---|---|---|
| US4709321A (en) * | 1986-10-31 | 1987-11-24 | Rca Corporation | Regulator protection circuit for video apparatus |
| CN2703359Y (en) * | 2004-03-01 | 2005-06-01 | 谢胜华 | Switch power supply source module circuit |
| CN2785248Y (en) * | 2005-03-31 | 2006-05-31 | 毛灿豪 | Switch power supply for stabilizing maximum output power limitation |
| CN101277065A (en) * | 2008-01-18 | 2008-10-01 | 天宝电子（惠州）有限公司 | Switch power supply of inverse-excitation type self-excitation converting circuit RCC |
| CN101814828A (en) * | 2009-02-24 | 2010-08-25 | 王立扬 | Series circuit of power switch device |
-
2010
- 2010-11-16 CN CN2010105488846A patent/CN102468761A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4709321A (en) * | 1986-10-31 | 1987-11-24 | Rca Corporation | Regulator protection circuit for video apparatus |
| CN2703359Y (en) * | 2004-03-01 | 2005-06-01 | 谢胜华 | Switch power supply source module circuit |
| CN2785248Y (en) * | 2005-03-31 | 2006-05-31 | 毛灿豪 | Switch power supply for stabilizing maximum output power limitation |
| CN101277065A (en) * | 2008-01-18 | 2008-10-01 | 天宝电子（惠州）有限公司 | Switch power supply of inverse-excitation type self-excitation converting circuit RCC |
| CN101814828A (en) * | 2009-02-24 | 2010-08-25 | 王立扬 | Series circuit of power switch device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941791A (en) * | 2013-01-17 | 2014-07-23 | 常州隆辉照明科技有限公司 | A circuit for reference ground connection conversion |
| CN104935170A (en) * | 2014-03-21 | 2015-09-23 | 深圳市海洋王照明工程有限公司 | Switch power supply and lamp |
| CN104935170B (en) * | 2014-03-21 | 2019-04-30 | 深圳市海洋王照明工程有限公司 | Switching Power Supply and lamps and lanterns |
| CN113655363A (en) * | 2021-09-13 | 2021-11-16 | 东科半导体(安徽)股份有限公司 | On-line testing circuit for conduction voltage drop of main switching tube of switching power supply |
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Application publication date: 20120523 |