CN102075002A - Dual power supply circuit - Google Patents
Dual power supply circuit Download PDFInfo
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- CN102075002A CN102075002A CN2010106126950A CN201010612695A CN102075002A CN 102075002 A CN102075002 A CN 102075002A CN 2010106126950 A CN2010106126950 A CN 2010106126950A CN 201010612695 A CN201010612695 A CN 201010612695A CN 102075002 A CN102075002 A CN 102075002A
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Abstract
The embodiment of the invention provides a dual power supply circuit. The first end of a first transistor is connected with a main power supply; a first resistor for providing driving current for the control end of the first transistor is connected in series between the first end of the first transistor and the control end of the first transistor; the second end of the first transistor is connected with the first end of a second transistor and an auxiliary power supply; the control end of the second transistor is connected with the control end of a third transistor; the second end of the second transistor provides output voltage; the first end of a second resistor is connected with the second end of the first transistor and the auxiliary power supply; the second end of the second resistor is connected with the control end of the second transistor and the control end of the third transistor; the first end of the third transistor is connected with the control end of the first transistor; the second end of the third transistor is connected with a cathode of a voltage stabilizing tube; and an anode of the voltage stabilizing tube is grounded. The dual power supply circuit can meet the requirements of low power consumption and the high stability of output voltage.
Description
Technical field
The present invention relates to the power circuit technical field, particularly a kind of double power supply circuit.
Background technology
In order to give the load continued power, proposed the dual power supply mode at present, it adopts main power source and accessory power supply is electric, and when mains power failure, switching to accessory power supply is electric.Present accessory power supply power supply circuits roughly can be divided into two big classes: a class is passive accessory power supply power supply circuits, mainly is the method that current source directly is provided by high-power start resistance, and the problem of existence is that power consumption is big and lasting, and power supply capacity is limited; Another kind of for triggering the startup power supply circuits, the problem of existence is a discontinuous operation, instability.
The shortcoming of prior art is:
That a kind of mode of operation at present no matter all can not satisfy low-power consumption simultaneously, and the requirement of high stability is not that the cost higher position is a poor performance.
Summary of the invention
The invention provides a kind of double power supply circuit, can satisfy the requirement that low-power consumption and output voltage have high stability.
In view of this, the embodiment of the invention provides:
A kind of double power supply circuit comprises:
The first transistor, transistor seconds, the 3rd transistor, first resistance, second resistance and voltage-stabiliser tube, the first transistor, transistor seconds and the 3rd transistor have first end, second end and control end respectively, wherein,
Be connected in series first resistance that the control end that is used to the first transistor provides drive current between the first termination main power source of the first transistor, first end of the first transistor and the control end of the first transistor; First end of the second termination transistor seconds of the first transistor, the second termination accessory power supply of described the first transistor;
Control termination the 3rd transistorized control end of transistor seconds, second end of transistor seconds provides output voltage, second end and the accessory power supply of the first termination the first transistor of second resistance, the control end of the second termination transistor seconds of second resistance and the 3rd transistorized control end; Described second resistance is used to the control end of transistor seconds or the 3rd transistorized control end that drive current is provided;
The control end of the 3rd transistorized first termination the first transistor, the negative pole of the 3rd transistorized second termination voltage-stabiliser tube, the plus earth of described voltage-stabiliser tube.
The double power supply circuit that the embodiment of the invention provides mainly adopts two to adjust pipe (being the first transistor and transistor seconds), a control valve (i.e. the 3rd transistor), two driving resistor (i.e. first resistance and second resistance) and a voltage-stabiliser tube constitute double power supply circuit, under the effect of control valve and voltage-stabiliser tube, make main power source input voltage and accessory power supply input voltage when wide fluctuations and main power source input voltage and the switching of accessory power supply input voltage, guaranteed that the output voltage of transistor seconds second end is in the state of high stable, has satisfied the requirement of low-power consumption simultaneously.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, to do to introduce simply to the accompanying drawing of required use among the embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the double power supply circuit structure chart that the embodiment of the invention provides.
Embodiment
The embodiment of the invention provides a kind of double power supply circuit, it mainly comprises: the first transistor, transistor seconds, the 3rd transistor, first resistance, second resistance and voltage-stabiliser tube, the first transistor, transistor seconds and the 3rd transistor have first end, second end and control end respectively, wherein
Be connected in series first resistance that the control end that is used to the first transistor provides drive current between the first termination main power source of the first transistor, first end of the first transistor and the control end of the first transistor; First end of the second termination transistor seconds of the first transistor, the second termination accessory power supply of described the first transistor;
Control termination the 3rd transistorized control end of transistor seconds, second end of transistor seconds provides output voltage, second end and the accessory power supply of the first termination the first transistor of second resistance, the control end of the second termination transistor seconds of second resistance and the 3rd transistorized control end; Described second resistance is used to the control end of transistor seconds or the 3rd transistorized control end that drive current is provided;
The control end of the 3rd transistorized first termination the first transistor, the negative pole of the 3rd transistorized second termination voltage-stabiliser tube, the plus earth of described voltage-stabiliser tube.
Wherein, the first transistor, transistor seconds, the 3rd transistor can be respectively the Q1 among Fig. 1, Q2 and Q3 shown in the subsequent embodiment.
Optionally, this double power supply circuit also comprises: first diode that is connected in series between the control end of the 3rd transistorized first end and the first transistor, wherein, the positive pole of first diode connects the 3rd transistorized first end, and the negative pole of first diode connects the control end of the first transistor.At this moment, first resistance is connected between first end of the positive pole of first diode and the first transistor.Wherein, first diode has the effect of the back-pressure of preventing, can prevent that the first transistor is damaged.
Optionally, this double power supply circuit also comprises second diode, wherein, second end of the first termination the first transistor of described second resistance and the negative pole of second diode, the positive pole of second diode connects accessory power supply, this second diode has the effect of the back-pressure of preventing, can prevent that transistor seconds and the 3rd transistor are damaged.
Optionally, this double power supply circuit also comprises electric capacity, and described electric capacity is connected between second end and ground of transistor seconds.
Wherein, the first transistor, transistor seconds, the 3rd transistor are field effect transistor or positive-negative-positive triode; Concrete, first end of the first transistor, second end and control end are respectively source electrode, the drain and gates of first field effect transistor, perhaps, and the collector electrode of the first positive-negative-positive triode, emitter and base stage; First end of transistor seconds, second end and control end are respectively source electrode, the drain and gates of second field effect transistor, perhaps, and the collector electrode of the second positive-negative-positive triode, emitter and base stage; The 3rd transistorized first end, second end and control end are respectively source electrode, the drain and gate of the 3rd field effect transistor, perhaps, and the collector electrode of the 3rd positive-negative-positive triode, emitter and base stage.
Wherein, described voltage-stabiliser tube is the stable semiconductor device of avalanche voltage.
The concrete structure figure of the double power supply circuit that the embodiment of the invention that Fig. 1 shows provides, this double power supply circuit specifically comprises:
The collector electrode of transistor Q1 connects main power source, connects main power source behind the collector series resistance R3 of concrete transistor Q1; Serial connection diode D1 between the collector electrode of the base stage of transistor Q1 and transistor Q3, wherein, the base stage of transistor Q1 connects the negative pole of diode D1, and the emitter of transistor Q1 connects the collector electrode of transistor Q2; Resistance R 1 is serially connected between the collector electrode and base stage of transistor Q1, and is concrete, and resistance R 1 is serially connected between the collector electrode of the positive pole of diode D1 and transistor Q1;
The collector electrode of transistor Q2 links to each other with the emitter of transistor Q1, the base stage of transistor Q2 connects the base stage of transistor Q3, the collector electrode of transistor Q2 links to each other with accessory power supply by diode D2, wherein, the collector electrode of transistor Q2 connects the negative pole of diode D2, the collector electrode of the first termination transistor Q2 of resistance R 2 and the negative pole of diode D2, the base stage of the second termination transistor Q2 of resistance R 2 and the base stage of transistor Q3;
Be connected in series diode D1 between the base stage of the collector electrode of transistor Q3 and transistor Q1, wherein, the collector electrode of transistor Q3 connects the positive pole of diode D1, and the base stage of transistor Q3 connects the base stage of transistor Q2, the emitter of transistor Q3 links to each other with the negative pole of voltage-stabiliser tube ZD1, the plus earth of voltage-stabiliser tube ZD1.
Capacitor C 1 is connected between the negative pole of the positive pole of voltage-stabiliser tube ZD1 and diode D2.Capacitor C 2 is connected between the emitter and ground of transistor Q2.
The power supply process of following description double power supply circuit: after the main power source energising, suppose that main power source provides input voltage V
Input, input voltage V
InputDrive current is provided for transistor Q1 by resistance R 1, makes transistor Q1 conducting, the collector voltage of transistor Q1 rises, and drive current is provided for transistor Q2 by resistance R 2, makes transistor Q2 conducting, the collector electrode output voltage V of transistor Q2
OutputBegin to rise.Work as V
OutputRise to the voltage stabilizing value V that surpasses voltage-stabiliser tube ZD1
ZD1During with the base stage pressure drop VQ3b of transistor Q3, this circuit provides drive current for transistor Q3 by resistance R 2, causes the Q3 conducting, and like this, the base voltage of transistor Q2 just is stabilized in fixed voltage V
ZThe place, wherein, V
Z=V
ZD1+ VQ3b, at this moment, transistor Q3 is operated in the emitter following state, and the output voltage of its emitter approximates VQ3b, like this, the voltage V that provides at main power source
InputWhen wide fluctuations, the output voltage stabilization that also can make double power supply circuit is in the fixed voltage scope.
The voltage V that provides when accessory power supply
CcAfter being higher than the emitter voltage of Q1, voltage V
CcDrive current is provided for transistor Q3 by resistance R 2, causes the Q3 conducting, the base voltage of Q1 is dragged down, and causes Q1 to end, and so just can realize that main power source arrives the switching of auxilliary power supply, because the input voltage V that main power source provides
InputGenerally be higher than the voltage V that accessory power supply provides
CcSo this double power supply circuit can be exported stable voltage, and can provide gapless power supply to switch, reduce power consumption.
Like this, when main power source was powered, the output voltage of this double power supply circuit was at 0-V
ZD1Between; When accessory power supply was powered, the output voltage of this double power supply circuit was at V
ZD1About.
The double power supply circuit that the embodiment of the invention provides mainly adopts two to adjust pipe (transistor Q1 and transistor Q2), a control valve (being transistor Q3), two driving resistor (being resistance R 1 and resistance R 2) and a voltage-stabiliser tube constitute double power supply circuit, under the effect of control valve and voltage-stabiliser tube, make main power source input voltage and accessory power supply input voltage when wide fluctuations and main power source input voltage and the switching of accessory power supply input voltage, guaranteed that the output voltage of transistor seconds second end is in the state of high stable, satisfied the requirement of low-power consumption simultaneously, realized that gapless power supply switches.
More than the double power supply circuit that the embodiment of the invention provided 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 (8)
1. a double power supply circuit is characterized in that, comprising:
The first transistor, transistor seconds, the 3rd transistor, first resistance, second resistance and voltage-stabiliser tube, the first transistor, transistor seconds and the 3rd transistor have first end, second end and control end respectively, wherein,
Be connected in series first resistance that the control end that is used to the first transistor provides drive current between the first termination main power source of the first transistor, first end of the first transistor and the control end of the first transistor; First end of the second termination transistor seconds of the first transistor, the second termination accessory power supply of described the first transistor;
Control termination the 3rd transistorized control end of transistor seconds, second end of transistor seconds provides output voltage, second end and the accessory power supply of the first termination the first transistor of second resistance, the control end of the second termination transistor seconds of second resistance and the 3rd transistorized control end; Described second resistance is used to the control end of transistor seconds or the 3rd transistorized control end that drive current is provided;
The control end of the 3rd transistorized first termination the first transistor, the negative pole of the 3rd transistorized second termination voltage-stabiliser tube, the plus earth of described voltage-stabiliser tube.
2. double power supply circuit according to claim 1, it is characterized in that, this double power supply circuit also comprises first diode, wherein, described first diode is between the control end of the 3rd transistorized first end and the first transistor, wherein, the positive pole of first diode connects the 3rd transistorized first end.
3. double power supply circuit according to claim 2 is characterized in that,
Described first resistance is connected between first end of the positive pole of first diode and the first transistor.
4. double power supply circuit according to claim 1 is characterized in that this double power supply circuit also comprises second diode, wherein,
Second end of the first termination the first transistor of described second resistance and the negative pole of second diode, the positive pole of second diode connects accessory power supply.
5. double power supply circuit according to claim 1 is characterized in that this double power supply circuit also comprises electric capacity, and described electric capacity is connected between second end and ground of transistor seconds.
6. double power supply circuit according to claim 1 is characterized in that,
The first transistor, transistor seconds, the 3rd transistor are field effect transistor or positive-negative-positive triode.
7. double power supply circuit according to claim 6 is characterized in that,
First end of the first transistor, second end and control end are respectively source electrode, the drain and gates of first field effect transistor, perhaps, and the collector electrode of the first positive-negative-positive triode, emitter and base stage;
First end of transistor seconds, second end and control end are respectively source electrode, the drain and gates of second field effect transistor, perhaps, and the collector electrode of the second positive-negative-positive triode, emitter and base stage;
The 3rd transistorized first end, second end and control end are respectively source electrode, the drain and gate of the 3rd field effect transistor, perhaps, and the collector electrode of the 3rd positive-negative-positive triode, emitter and base stage.
8. want 1 described double power supply circuit according to right, it is characterized in that,
Described voltage-stabiliser tube is the stable semiconductor device of avalanche voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106126950A CN102075002A (en) | 2010-12-29 | 2010-12-29 | Dual power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106126950A CN102075002A (en) | 2010-12-29 | 2010-12-29 | Dual power supply circuit |
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| CN102075002A true CN102075002A (en) | 2011-05-25 |
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| CN2010106126950A Pending CN102075002A (en) | 2010-12-29 | 2010-12-29 | Dual power supply circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333722A (en) * | 2014-10-30 | 2015-02-04 | 青岛歌尔声学科技有限公司 | Low power consumption starting circuit and liquid crystal television |
| CN107276063A (en) * | 2017-06-27 | 2017-10-20 | 合肥尚硕新能源有限公司 | A kind of accessory power supply supplement type charging circuit |
| CN110198075A (en) * | 2019-04-26 | 2019-09-03 | 科华恒盛股份有限公司 | Redundancy backup power supply and chip and electronic equipment |
| CN112510993A (en) * | 2019-09-16 | 2021-03-16 | 奇源科技有限公司 | High voltage stabilizer |
-
2010
- 2010-12-29 CN CN2010106126950A patent/CN102075002A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333722A (en) * | 2014-10-30 | 2015-02-04 | 青岛歌尔声学科技有限公司 | Low power consumption starting circuit and liquid crystal television |
| CN104333722B (en) * | 2014-10-30 | 2017-07-07 | 青岛歌尔声学科技有限公司 | A kind of low-power consumption start-up circuit and a kind of LCD TV |
| CN107276063A (en) * | 2017-06-27 | 2017-10-20 | 合肥尚硕新能源有限公司 | A kind of accessory power supply supplement type charging circuit |
| CN110198075A (en) * | 2019-04-26 | 2019-09-03 | 科华恒盛股份有限公司 | Redundancy backup power supply and chip and electronic equipment |
| CN110198075B (en) * | 2019-04-26 | 2021-03-19 | 漳州科华技术有限责任公司 | Redundant backup power supply, chip and electronic equipment |
| CN112510993A (en) * | 2019-09-16 | 2021-03-16 | 奇源科技有限公司 | High voltage stabilizer |
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