CN101083435B - Self-activated switch power supply apparatus - Google Patents
Self-activated switch power supply apparatus Download PDFInfo
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- CN101083435B CN101083435B CN2006100832291A CN200610083229A CN101083435B CN 101083435 B CN101083435 B CN 101083435B CN 2006100832291 A CN2006100832291 A CN 2006100832291A CN 200610083229 A CN200610083229 A CN 200610083229A CN 101083435 B CN101083435 B CN 101083435B
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Abstract
The invention publishes an self-excitation type power switch installment, including: the vertex 207 in the primary coil ST1 the vertex 201 connects the power source CN1, collecting electrode of the primary coil ST1 the vertex 202 connects the triode DQ9, the base electrode of the triode DQ9 through the resistance R52, resistance R54, the forward feedback end 203 which the electric capacity C61 contacts the connection tickler ST2, resistance R52, vertex 207 which the common end of resistance R54 through resistance R12 connects power source CN1, the emitter electrode of the triode DQ9 through resistance R55 connects the negative feedback end 204 of the tickler ST2 and vertex 208 of the power source CN1, the base electrode of triode DQ601 through resistance R501 connects the emitter electrode of the triode DQ9, the collecting electrode of triode DQ601 through resistance R503 connects the base electrode of triode DQ9, the emitter electrode of triode DQ601 connects the vertex 208 of the power sourceCN1. Because this invention may prevent switch triode DQ9 from appearing the overfull phenomenon to affect its service life, even damaged, has guaranteed the entire electrical power unit works with security, highly effective.
Description
Technical field
The present invention relates to field of power supplies, particularly relate to a kind of self-activated switch power supply.
Background technology
See also Fig. 1, circuit diagram for self-activated switch power supply apparatus in the prior art, the energising initial stage, switch triode DQ9 is in cut-off state, power supply CN1 provides starting resistor for switch triode DQ9 by resistance R 12, switch triode DQ9 conducting, its collector voltage descends, the voltage at the primary coil STI two ends of transformer T1 begins to rise, coupling by transformer T1, the feedback winding ST2 of transformer T1 produces an induced voltage, this induced voltage is by capacitor C 61, resistance R 54, resistance R 52 is transferred to the base stage of switch triode DQ9, owing to be positive feedback, switch triode DQ9 base voltage is strengthened, deepen the conducting degree of depth of switch triode DQ9, the voltage of switch triode DQ9 collector electrode is further descended, and corresponding, the voltage at primary coil ST1 two ends further rises, successively repeatedly, it is saturated fully finally to reach switch triode DQ9.
After switch triode DQ9 is saturated fully, because the voltage at transformer T1 primary coil ST1 two ends increases few, its voltage change ratio is close to 0, and capacitor C 61 reduces switch triode DQ9 base voltage by feedback coil ST2 discharge by resistance R 54, resistance R 52; Polar capacitor C62 is by diode D21 discharge, by voltage-stabiliser tube VD1, resistance R 52 reduces the base voltage of switch triode DQ9, reduce the saturation depth of switch triode DQ9, switch triode DQ9 collector voltage is risen, the voltage at switch transformer T1 primary coil STI two ends begins to descend, coupling by transformer T1, the feedback winding ST2 of switch transformer T1 produces reverse induced voltage, continue to reduce the saturation depth of switch triode DQ9, the voltage at primary coil ST1 two ends is further descended, successively repeatedly, finally reaching switch triode DQ9 ends fully.By the conducting of switch triode DQ9 and the circulation repeatedly that ends, on the primary coil ST1 of switch transformer T1, form the auto-excitation type oscillating voltage, on transformer T1 loading coil ST3, ST4, ST5, ST6, ST7, produce stable voltage output, finish the conversion of supply voltage.
From the course of work of this supply unit circuit as can be seen, switch triode DQ9 reach fully saturated after, could utilize feedback winding ST2 to produce negative feedback voltage ends, but in real work, before switch triode DQ9 is saturated fully, the magnetic saturation phenomenon may appear in transformer T1, make the electric current moment surge of the primary coil ST1 that flows through, but the change in voltage at the two ends of primary coil ST1 is very little, feedback coil ST2 can not produce reverse induction voltage cutoff switch triode DQ9, cause switch triode DQ9 supersaturation to occur, its emitter current is excessive, and collector voltage is excessive, has a strong impact on the useful life of switch triode DQ9, even can directly damage switch triode DQ9, and then influence the safety and the efficient of whole supply unit.
Summary of the invention
In view of this, the method that the present invention deals with problems provides a kind of self-activated switch power supply, can solve in the existing self-activated switch power supply apparatus influences its useful life because of satiety appears in switch triode, even impaired problem, can guarantee whole supply unit safety, work efficiently.
The technical solution used in the present invention comprises: power supply (CN1), transformer (T1), first triode (DQ9), transformer (T1) comprises primary coil (ST1), feedback coil (ST2), one end points of primary coil (ST1) connects first end points of power supply (CN1), primary coil (ST1) first end points connects the collector electrode of first triode (DQ9), the base stage of first triode (DQ9) is by first resistance (R52) of polyphone, second resistance (R54), first electric capacity (C61) connects the positive feedback end of feedback coil (ST2), first resistance (R52), the common port of second resistance (R54) connects first end points of power supply (CN1) by the 3rd resistance (R12), the emitter of first triode (DQ9) connects the negative sense feedback end and power supply (CN1) second end points of feedback coil (ST2) by the 4th resistance (R55), also comprise: second triode (DQ601), the base stage of second triode (DQ601) connects the emitter of first triode (DQ9) by the 5th resistance (R501), the collector electrode of second triode (DQ601) is by the base stage of the 6th resistance (R503) connection first triode (DQ9), and the emitter of second triode (DQ601) connects second end points of power supply (CN1); Also comprise first diode (D22), the anode of first diode (D22) connects the negative pole of power supply (CN1), and the negative electrode of first diode (D22) connects the base stage of first triode (DQ9).
Preferably, also comprise: the 7th resistance (R502), the 7th resistance (R502) connects second end points of power supply (CN1) and the base stage of second triode (DQ601).
Preferably, also comprise: second diode (D21), second polar capacitor (C62), the 8th resistance (R53), voltage-stabiliser tube (VD1), the negative electrode of second diode (D21) connects the positive feedback end 203 of feedback coil (ST2), the anode of second diode (D21) is by the 8th resistance (R53) in parallel, second polar capacitor (C62) connects the negative sense feedback end of feedback coil (ST2), the anode of second diode (D21) connects the negative pole of second polar capacitor (C62), the positive pole of second polar capacitor (C62) connects the negative sense feedback end of feedback coil (ST2), the anode of voltage-stabiliser tube (VD1) connects the negative electrode of second polar capacitor (C62), and the negative electrode of voltage-stabiliser tube (VD1) connects first resistance (R52).
Preferably, also comprise: the 3rd diode (D20), the 9th resistance (R51), the 3rd electric capacity (C60), the anode of the 3rd diode (D20) connects first end points of primary coil (ST1), and the negative electrode of the 3rd diode (D20) connects first end points of primary coil (ST1) by the 9th resistance (R51) in parallel, the 3rd electric capacity (C60).
Preferably, also comprise: light-emitting diode (LED1), the tenth resistance (R64), the anode of light-emitting diode (LED1) is by first end points of the tenth resistance (R64) connection power supply (CN1), and the negative electrode of light-emitting diode (LED1) connects second end points of power supply (CN1).
Preferably, also comprise: transformer (T1) comprises at least one loading coil.
Compared with prior art; the present invention has safety; advantage efficiently; the present invention adopts protection triode DQ601; its base stage connects the emitter of switch triode DQ9 by a resistance 501; the collector electrode of protection triode DQ601 connects the base stage of switch triode DQ9 by a resistance R 503; the emitter of protection triode DQ601 connects the negative sense feedback end 204 of feedback winding ST2; when switch triode DQ9 conducting; increasing along with its conducting degree of depth; when the electric current of its emitter reaches a certain numerical value; the base stage of protection triode DQ601 is by resistance R 501; the voltage of resistance R 502 conduction just reaches conduction value; protection triode DQ601 conducting, its collector voltage descends, and makes switch triode DQ9 base voltage be reduced to below the conduction value; switch triode DQ9 ends, and avoids switch triode DQ9 supersaturation to occur.Therefore; the circuit of self-activated switch power supply apparatus of the present invention is by increasing by a protection triode DQ601; the electric current of the emitter of control switch triode DQ9; prevent that switch triode DQ9 from influencing its useful life because of the satiety phenomenon occurring; even impaired problem, guarantee whole supply unit safety, work efficiently.
Description of drawings
Fig. 1 is the circuit diagram of self-activated switch power supply apparatus in the prior art;
Fig. 2 is a self-activated switch power supply apparatus circuit diagram of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
See also Fig. 2; be this bright self-excited switching power supply circuit figure; primary coil ST1 first end points 201 connects first end points 207 of power supply; primary coil ST1 second end points 202 connects the collector electrode of switch triode DQ9; the base stage of switch triode DQ9 is by the resistance R 52 of polyphone; resistance R 54; capacitor C 61 connects the positive feedback end 203 of feedback coil ST2; resistance R 52; the common port of resistance R 54 connects first end points 207 of power supply CN1 by resistance R 52; the emitter of switch triode DQ9 connects negative sense feedback end 204 and power supply CN1 second end points 208 of feedback coil ST2 by resistance R 55; the base stage of protection triode DQ601 connects the emitter of switch triode DQ9 by resistance R 501; the collector electrode of protection triode DQ601 is by the base stage of resistance R 503 connection switch triode DQ9, and the emitter of protection triode DQ601 connects second end points 208 of power supply CN1.Resistance R 502 connects the base stage of second end points 208 with the triode DQ601 of power supply CN1.
The energising initial stage, switch triode DQ9 is in cut-off state, power supply CN1 gives starting resistor of switch triode DQ9 base stage by resistance R 12, resistance R 52, switch triode DQ9 conducting, its collector voltage begins to descend, and promptly the voltage at primary coil ST1 second end points 202 places of transformer T1 begins to descend, and first end points, 201 place's voltages remain unchanged because of linking to each other with power supply CN1 first end points 207, therefore, the voltage at primary coil STI two ends rises.
The change in voltage at primary coil ST1 two ends, at the certain magnetic flux of the inner generation of transformer T1, coupling by transformer T1, the feedback winding ST2 of transformer T1 produces induced voltage, this induced voltage is by capacitor C 61, resistance R 54, resistance R 52 is transferred to the base stage of switch triode DQ9, owing to be positive feedback, the voltage that is switch triode DQ9 base stage rises, deepen the conducting degree of depth of switch triode DQ9, its collector voltage quickens to descend, and the voltage at primary coil ST1 two ends quickens to rise, and remakes and uses feedback coil ST2, successively repeatedly, finally make switch triode DQ9 saturated fully.
After switch triode DQ9 is saturated fully, because the voltage at transformer T1 primary coil ST1 two ends increases few, its voltage change ratio is close to 0, capacitor C 61 is by feedback coil ST2 discharge, by resistance R 54, resistance R 52 reduces switch triode DQ9 base voltage reduces the saturation depth of switch triode DQ9, the electric current of switch triode DQ9 inside of flowing through reduces, switch triode DQ9 collector voltage begins to rise, the voltage of primary coil STI descends, coupling by switch transformer T1, feedback winding ST2 produces reverse induced voltage, continue to reduce the saturation depth of switch triode DQ9, make the voltage at primary coil ST1 two ends quicken to descend, successively repeatedly, final switch triode DQ9 ends fully.
But, if switch triode DQ9 reach fully saturated before, the magnetic saturation phenomenon appears in transformer T1, make the electric current moment surge of the primary coil ST1 that flows through, but the change in voltage at the two ends of primary coil ST1 is very little, feedback coil ST2 can not produce reverse induction voltage cutoff switch triode DQ9, cause switch triode DQ9 supersaturation to occur, its emitter current is excessive, collector voltage is excessive, have a strong impact on the useful life of switch triode DQ9, even can directly damage switch triode DQ9.
During the triode conducting, the electric current that its emitter is flowed through is base stage and collector electrode inflow current sum, and the electric current that emitter is flowed through is a utmost point of electric current maximum in three electrodes of triode.Therefore, in circuit of the present invention, adopt protection triode DQ601 to come the emitter current of limit switch triode DQ9, prevent that effectively switch triode DQ9 internal current is excessive, protection switch triode DQ9 safety, stable operation.
The base stage of protection triode DQ601 connects the emitter of switch triode DQ9 by resistance 501; the collector electrode of protection triode DQ601 connects the base stage of switch triode DQ9 by resistance R 503; the emitter of protection triode DQ601 connects the negative sense feedback end 204 of feedback winding ST2; when the electric current of switch triode DQ9 emitter reaches a certain default numerical value; emitter current is by resistance R 501; resistance R 502 is transferred to the base stage of protection triode DQ601; make it just reach conducting voltage; protection triode DQ601 conducting; its collector voltage descends; switch triode DQ9 is ended because of base voltage reduces, avoid switch triode DQ9 the supersaturation situation to occur.
Described a certain default numerical value can according to the ceiling voltage of the moment maximum power of the maximum current of the permission of switch triode DQ9, permission, permission with and characteristic such as peripheral circuit set, as, the model of switch triode DQ9 is C3150, it allows maximum current is 3A, the instantaneous power that allows is 50W to the maximum, the ceiling voltage that allows is 800V, and in conjunction with peripheral circuit, this numerical value should be between 400mA-500mA.By regulating the size and the ratio of resistance R 55, resistance R 501, resistance R 502, when making the electric current of switch triode DQ9 emitter reach the numerical value of setting, the voltage of protection triode DQ601 base stage just reaches its conducting voltage 0.7V.Same principle; protection triode DQ601 also can be by control switch triode DQ9 collector electrode or base stage voltage or electric current realize protection to switch triode DQ9; but the difficulty that realizes is bigger; need comparatively complicated peripheral circuit, the effect of its protection is compared relatively poor with the effect of control switch triode DQ9 emitter current.
Circuit of the present invention also comprises diode D21, polar capacitor C62, resistance R 53, the negative electrode of diode D21 connects the positive feedback end 203 of feedback coil ST2, the anode of diode D21 connects the negative sense feedback end 204 of feedback coil ST2 by parallel resistor R53, polar capacitor C62, the anode of diode D21 connects the negative pole of polar capacitor C62, the positive pole of polar capacitor C62 connects the negative sense feedback end 204 of feedback coil ST2, the anode of voltage-stabiliser tube VD1 connects the negative electrode of polar capacitor C62, and the negative electrode of voltage-stabiliser tube VD1 connects resistance R 52.
Diode D21, polar capacitor C62, resistance R 53, voltage-stabiliser tube VD1 effect is that the feedback winding ST2 to transformer T1 carries out voltage stabilizing, feedback coil ST2 is by diode D21, resistance R 53, polar capacitor C62 carries out rectification, the induced voltage that feedback coil ST2 produces is transferred on the polar capacitor C62, electric weight on the polar capacitor C62 increases, because of polar capacitor C62 is a reverse voltage, voltage-stabiliser tube VD1 is the voltage-stabiliser tube of 5.1V, the DQ9 cut-ff voltage of switch triode is 0.6V, when the voltage of polar capacitor C62 less than-5.7V, the voltage of switch triode DQ9 base stage is less than 0.6V, switch triode DQ9 ends, feedback coil ST2 begins discharge, cause the voltage on the polar capacitor C62 to rise, when polar capacitor C62 voltage rises to-4.4V, switch triode DQ9 base voltage rises to 0.7, makes switch triode DQ9 conducting once more, the beginning next cycle.Through free-running adjustment repeatedly, feedback coil ST2 voltage reach charge and discharge stable after, polar capacitor C62 has reached the state completely that charges, and realizes the voltage stabilizing control to feedback coil ST2.
The frequency of oscillation of supply unit circuit of the present invention is by the parameter decision of elements such as primary coil ST1, the feedback coil ST2 of transformer T1, capacitor C 61, resistance R 54, resistance R 52.By adjusting the parameter of primary coil ST1, feedback coil ST2, capacitor C 61, resistance R 54, resistance R 52, can make the duty ratio in circuit oscillation cycle be adjusted into 50%, it is best that oscillation effect reaches.
Circuit of the present invention also comprises diode D22, and the anode of diode D22 connects the negative pole of power supply CN1, and the negative electrode of diode D22 connects the base stage of triode DQ9.
The voltage that act as limit switch triode DQ9 base stage and protection triode DQ601 collector electrode of diode D22, protection switch triode DQ9 and protection triode DQ601 safety, stable operation.
Circuit of the present invention also comprises diode D20, resistance R 51, capacitor C 60, and the anode of diode D20 connects second end points 202 of primary coil ST1, and the negative electrode of diode D20 connects first end points 201 of primary coil ST1 by parallel resistor R51, capacitor C 60.
Diode D20, resistance R 51, capacitor C 60 to act as the voltage that prevents primary coil ST1 two ends excessive, protection primary coil ST1 safe and stable operation.
Circuit of the present invention also comprises LED 1, resistance R 64, and the anode of LED 1 is by first end points 207 of resistance R 64 connection power supply CN1, and the negative electrode of LED 1 connects second end points 208 of power supply CN1.
Transformer T1 of the present invention also comprises loading coil ST3, ST4, ST5, ST6 and ST7, is used to export required voltage.Wherein, the end points 205 of loading coil ST3 connects the anode of diode D27, the negative electrode of diode D27 connects the anode of polar capacitor C67, and the negative terminal of polar capacitor C67 connects the end points 206 of loading coil ST3, and the positive and negative two ends of polar capacitor C67 are the positive and negative terminal of position output voltage respectively.By adjusting the turn ratio of loading coil ST3 and primary coil ST1, can obtain required voltage.The annexation of loading coil ST4, ST5, ST6 and ST7 is identical with loading coil ST3 with operation principle, repeats no more.
The operation principle of self-activated switch power supply apparatus of the present invention is to utilize the conducting of feedback coil ST2 and resistance R 54, resistance R 52, resistance R 53, capacitor C 61, polar capacitor C62, diode D21, the common control switch triode of voltage-stabiliser tube VD1 DQ9, end, on primary coil ST1, form oscillating current, on loading coil ST3, ST4, ST5, ST6 and ST7, produce voltage, finish the conversion of supply voltage.Protection triode DQ601 prevents that supersaturation from appearring in switch triode DQ9, the work that protection switch triode DQ9 is stable, safe by the electric current of control switch triode DQ9 emitter.
More than a kind of self-activated switch power supply apparatus provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. self-activated switch power supply, comprise power supply (CN1), transformer (T1) and first triode (DQ9), transformer (T1) comprises primary coil (ST1) and feedback coil (ST2), first end points of primary coil (ST1) connects first end points of power supply (CN1), primary coil (ST1) second end points connects the collector electrode of first triode (DQ9), the base stage of first triode (DQ9) is by first resistance (R52) of polyphone, second resistance (R54), first electric capacity (C61) connects the positive feedback end of feedback coil (ST2), first resistance (R52), the common port of second resistance (R54) connects first end points of power supply (CN1) by the 3rd resistance (R12), the emitter of first triode (DQ9) connects the negative sense feedback end and power supply (CN1) second end points of feedback coil (ST2) by the 4th resistance (R55), it is characterized in that, also comprise:
Second triode (DQ601), the base stage of second triode (DQ601) connects the emitter of first triode (DQ9) by the 5th resistance (R501), the collector electrode of second triode (DQ601) is by the base stage of the 6th resistance (R503) connection first triode (DQ9), and the emitter of second triode (DQ601) connects second end points of power supply (CN1);
Also comprise first diode (D22), the anode of first diode (D22) connects second end points of power supply (CN1), and the negative electrode of first diode (D22) connects the base stage of first triode (DQ9).
2. self-activated switch power supply according to claim 1 is characterized in that, also comprises:
The 7th resistance (R502), the 7th resistance (R502) connects second end points of power supply (CN1) and the base stage of second triode (DQ601).
3. self-activated switch power supply according to claim 1 and 2 is characterized in that, also comprises:
Second diode (D21), second polar capacitor (C62), the 8th resistance (R53) and voltage-stabiliser tube (VD1), the negative electrode of second diode (D21) connects the positive feedback end of feedback coil (ST2), the anode of second diode (D21) is by the 8th resistance (R53) in parallel, second polar capacitor (C62) connects the negative sense feedback end of feedback coil (ST2), the anode of second diode (D21) connects the negative pole of second polar capacitor (C62), the positive pole of second polar capacitor (C62) connects the negative sense feedback end of feedback coil (ST2), the anode of voltage-stabiliser tube (VD1) connects the negative electrode of second polar capacitor (C62), and the negative electrode of voltage-stabiliser tube (VD1) connects the common port of first resistance (R52) and second resistance (R54).
4. self-activated switch power supply according to claim 1 and 2 is characterized in that, also comprises:
The 3rd diode (D20), the 9th resistance (R51) and the 3rd electric capacity (C60), the anode of the 3rd diode (D20) connects second end points of primary coil (ST1), and the negative electrode of the 3rd diode (D20) connects first end points of primary coil (ST1) by the 9th resistance (R51) in parallel, the 3rd electric capacity (C60).
5. self-activated switch power supply according to claim 1 and 2 is characterized in that, also comprises:
Light-emitting diode (LED1) and the tenth resistance (R64), the anode of light-emitting diode (LED1) are by first end points of the tenth resistance (R64) connection power supply (CN1), and the negative electrode of light-emitting diode (LED1) connects second end points of power supply (CN1).
6. self-activated switch power supply according to claim 1 and 2 is characterized in that, also comprises:
Transformer (T1) comprises at least one loading coil.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100832291A CN101083435B (en) | 2006-05-31 | 2006-05-31 | Self-activated switch power supply apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100832291A CN101083435B (en) | 2006-05-31 | 2006-05-31 | Self-activated switch power supply apparatus |
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| Publication Number | Publication Date |
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| CN101083435A CN101083435A (en) | 2007-12-05 |
| CN101083435B true CN101083435B (en) | 2010-11-10 |
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| CN2006100832291A Active CN101083435B (en) | 2006-05-31 | 2006-05-31 | Self-activated switch power supply apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107073715B (en) * | 2017-01-13 | 2019-10-18 | 深圳市奥星澳科技有限公司 | A kind of Wireless intelligent control device and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5082998A (en) * | 1990-01-16 | 1992-01-21 | Yutaka Electric Mfg. Co., Ltd. | Switching power supply for microwave oven |
| CN1667929A (en) * | 2005-02-04 | 2005-09-14 | 邹荣生 | Multipurpose switch power supply |
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2006
- 2006-05-31 CN CN2006100832291A patent/CN101083435B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5082998A (en) * | 1990-01-16 | 1992-01-21 | Yutaka Electric Mfg. Co., Ltd. | Switching power supply for microwave oven |
| CN1667929A (en) * | 2005-02-04 | 2005-09-14 | 邹荣生 | Multipurpose switch power supply |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平10-42557A 1998.02.13 |
| JP特开平9-247957A 1997.09.19 |
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