CN204349772U - A kind of linear voltage stabilization power supply circuits - Google Patents
A kind of linear voltage stabilization power supply circuits Download PDFInfo
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- CN204349772U CN204349772U CN201420832539.9U CN201420832539U CN204349772U CN 204349772 U CN204349772 U CN 204349772U CN 201420832539 U CN201420832539 U CN 201420832539U CN 204349772 U CN204349772 U CN 204349772U
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Abstract
The utility model discloses a kind of linear voltage stabilization power supply circuits, at least comprise voltage stabilizing didoe, Current amplifier triode, described circuit also comprises voltage holding unit and anti-leak unit, described voltage holding unit is parallel to described voltage stabilizing didoe two ends and is connected between described Current amplifier transistor base and ground, described anti-leak units in series is between input voltage and the collector electrode of described Current amplifier triode, the utility model for low pressure input DC-DC power source provide one highly reliable, the linear voltage stabilization power supply circuits of low voltage difference.
Description
Technical field
The utility model relates to a kind of linear voltage stabilization power supply circuits, particularly relates to a kind of linear voltage stabilization power supply circuits being applicable to being applied to low pressure input DC-DC power source.
Background technology
Fig. 1 is the linear power supply circuits of existing DC-DC power source, and it forms a linear voltage-stabilizing circuit the most basic mainly through upper offset resistance R1, filter capacitor C1, voltage stabilizing didoe Z1 and Current amplifier triode Q1.Before power supply is started working, a metastable voltage supply power control circuit is provided by this linear voltage-stabilizing circuit, after power work, the general auxiliary winding by transformer is after rectifying and wave-filtering, power supply is to power control circuit, increase auxiliary winding power and can reduce linear voltage-stabilizing circuit power consumption, thus improve product efficiency.
But, the circuit of Fig. 1 has such shortcoming: when input short, the rapid step-down of base voltage of Current amplifier triode Q1, a PN junction voltage higher than input voltage, be generally 0.7V, because input voltage during input short is close to 0V, and the output voltage that in filter capacitor C1 short time voltage, maintenance is original is constant, when output voltage is greater than 8V, the emitter of Current amplifier triode Q1 and base stage have a reverse voltage being greater than 6V, the emitter of Current amplifier triode Q1 and base stage is oppositely withstand voltage is generally less than 6V, therefore during this situation generation, triode is probably damaged.
Fig. 2 is the improvement circuit of Fig. 1, and this circuit application is extensive, and compare Fig. 1, Fig. 2 adds diode D1, effectively can prevent B-E (base-emitter) reverse breakdown of Current amplifier triode Q1.But its shortcoming is, output voltage decreases the voltage of a diode forward pressure drop, is generally 0.7V.In DC-DC (DC-to-DC) power supply that input is lower, in the power supply as 9V input, the general cut-in voltage of control chip needs 8V, therefore the circuit of Fig. 2 can not meet the demands.
Summary of the invention
For overcome above-mentioned prior art exist deficiency, one of the utility model object is to provide a kind of linear voltage stabilization power supply circuits, its can for low pressure input DC-DC power source provide one highly reliable, the linear voltage stabilization power supply circuits of low voltage difference.
For reaching above-mentioned and other object, the utility model proposes a kind of linear voltage stabilization power supply circuits, at least comprise voltage stabilizing didoe, Current amplifier triode, described circuit also comprises voltage holding unit and anti-leak unit, described voltage holding unit is parallel to described voltage stabilizing didoe two ends and is connected between described Current amplifier transistor base and ground, and described anti-leak units in series is between input voltage and the collector electrode of described Current amplifier triode.
Further, described voltage holding unit comprises an afterflow electric capacity, and described afterflow Capacitance parallel connection is at described voltage stabilizing didoe two ends and be connected between described Current amplifier transistor base and ground.
Further, described anti-leak unit comprises an anti-leak diode, and the positive pole of described anti-leak diode is connected with described input voltage, and negative pole connects the collector electrode of described Current amplifier triode.
Further, described circuit also comprises biasing resistor, described biasing resistor with in parallel after described voltage stabilizing didoe and voltage holding unit be series between described input voltage and ground.
Further, described circuit also comprises filter capacitor, and the emitter of described Current amplifier triode connects one end of described filter capacitor, the other end ground connection of described filter capacitor.
Further, described afterflow electric capacity is made up of multiple capacitances in series.
Further, described afterflow electric capacity is made up of multiple Capacitance parallel connection.
Further, described afterflow electric capacity is made up of the Capacitance parallel connection of multiple different capacitance.
Further, described Current amplifier triode is NPN pipe.
Further, described voltage stabilizing didoe is avalanche diode or Zener diode.
Compared with prior art, a kind of linear voltage stabilization power supply circuits of the utility model are by being parallel to voltage stabilizing didoe two ends to the increase of conventional linear voltage stabilizing circuit and the voltage holding unit be connected between Current amplifier transistor base and ground and the anti-leak unit be series between input voltage VIN+and Current amplifier transistor collector, for low pressure input DC-DC power source provide one highly reliable, the linear voltage stabilization power supply circuits of low voltage difference, compared to existing technology, the existing input of the utility model, output voltage pressure reduction is little, there is again the advantage of triode B-E pole reverse breakdown when effectively can prevent input short.
Accompanying drawing explanation
Fig. 1 is the linear power supply circuits of existing DC-DC power source;
Fig. 2 is the improvement circuit of Fig. 1;
Fig. 3 is the circuit structure diagram of a kind of linear voltage stabilization power supply circuits of the utility model.
Embodiment
Below by way of specific instantiation and accompanying drawings execution mode of the present utility model, those skilled in the art can understand other advantage of the present utility model and effect easily by content disclosed in the present specification.The utility model is also implemented by other different instantiation or is applied, and the every details in this specification also can based on different viewpoints and application, carries out various modification and change not deviating under spirit of the present utility model.
Fig. 3 is the circuit structure diagram of a kind of linear voltage stabilization power supply circuits of the utility model.As shown in Figure 3, a kind of linear voltage stabilization power supply circuits of the utility model, except comprising biasing resistor R1, filter capacitor C1, voltage stabilizing didoe Z1 and Current amplifier triode Q1, also comprise: voltage holding unit 30 and anti-leak unit 31.
Wherein, biasing resistor R1 and voltage stabilizing didoe Z1 is series between input voltage VIN+and ground, its intermediate node connects Current amplifier triode Q1 base stage, Current amplifier triode Q1 emitter connects one end of filter capacitor C1, filter capacitor C1 other end ground connection, load 32 is connected in the two ends of filter capacitor C1.Voltage holding unit 30 is parallel to voltage stabilizing didoe Z1 two ends and is connected between Current amplifier triode Q1 base stage and ground, and it prevents its BE knot reversed bias voltage too high for making the base voltage of Current amplifier triode Q1 slowly decline; Anti-leak unit 31 is series between the collector electrode of input voltage VIN+and Current amplifier triode Q1, revealed by BC (base-collector junction) Exchange Settlement of Current amplifier triode Q1 to prevent the electric charge of voltage holding unit 30, the collector electrode output voltage PVCC of Current amplifier triode Q1, in the utility model preferred embodiment, Current amplifier triode Q1 is NPN pipe, voltage stabilizing didoe Z1 can be avalanche diode or Zener diode, but not as limit.
In the utility model preferred embodiment, anti-leak unit 31 comprises an anti-leak diode D1, this anti-leak diode D1 positive pole and input voltage VIN+be connected, and negative pole connects the collector electrode of Current amplifier triode Q1.Voltage holding unit 30 comprises an afterflow electric capacity C2, and afterflow electric capacity C2 is connected in parallel on voltage stabilizing didoe Z1 two ends.Compared with prior art, the input of the utility model existing Fig. 1 circuit, the advantage that output voltage pressure reduction is little, have again Fig. 2 circuit effectively can prevent input short time triode B-E pole reverse breakdown advantage.Certainly, afterflow electric capacity C2 also can be made up of to reduce the requirement of withstand voltage to afterflow electric capacity multiple capacitances in series, or is made up of to improve its frequency response the Capacitance parallel connection that multiple capacitance is different, does not repeat them here.
Specifically, compared to existing technology, the utility model adds anti-leak unit and voltage holding unit, in the utility model preferred embodiment, anti-leak unit comprises anti-leak diode D1, voltage holding unit comprises afterflow electric capacity C2, and BE (base-emitter) knot that the increase of these two devices can improve Current amplifier triode Q1 is reversed the problem punctured.Suddenly-applied short circuit is inputted when supposing the circuit working of the utility model, due to the unidirectional general character of leakage-preventing diode D1, afterflow electric capacity C2 electric charge can not discharge rapidly through the BC of Current amplifier triode Q1 (base-collector junction) knot, afterflow electric capacity C2 can only be discharged by biasing resistor R1, then the decrease speed of afterflow electric capacity C2 terminal voltage and biasing resistor R1, afterflow electric capacity C2 relating to parameters; Due to input short, auxiliary winding can not provide energy, and filter capacitor C1 voltage also can decline, and filter capacitor C1 terminal voltage decrease speed is relevant with its load.Therefore suitable biasing resistor R1, afterflow electric capacity C2 parameter can be chosen, ensure after input short, make the BE (base-emitter) of any moment Current amplifier triode Q1 tie reverse voltage and be all less than 5V, such Current amplifier triode Q1 would not be damaged.
In sum, a kind of linear voltage stabilization power supply circuits of the utility model are by being parallel to voltage stabilizing didoe two ends to the increase of conventional linear voltage stabilizing circuit and the voltage holding unit be connected between Current amplifier transistor base and ground and the anti-leak unit be series between input voltage VIN+and Current amplifier transistor collector, for low pressure input DC-DC power source provide one highly reliable, the linear voltage stabilization power supply circuits of low voltage difference, compared to existing technology, the existing input of the utility model, output voltage pressure reduction is little, there is again the advantage of triode B-E pole reverse breakdown when effectively can prevent input short.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any those skilled in the art all without prejudice under spirit of the present utility model and category, can carry out modifying to above-described embodiment and change.Therefore, rights protection scope of the present utility model, should listed by claims.
Claims (10)
1. linear voltage stabilization power supply circuits, at least comprise voltage stabilizing didoe, Current amplifier triode, it is characterized in that: described circuit also comprises voltage holding unit and anti-leak unit, described voltage holding unit is parallel to described voltage stabilizing didoe two ends and is connected between described Current amplifier transistor base and ground, and described anti-leak units in series is between input voltage and the collector electrode of described Current amplifier triode.
2. linear voltage stabilization power supply circuits as claimed in claim 1, is characterized in that: described voltage holding unit comprises an afterflow electric capacity, and described afterflow Capacitance parallel connection is at described voltage stabilizing didoe two ends and be connected between described Current amplifier transistor base and ground.
3. linear voltage stabilization power supply circuits as claimed in claim 1 or 2, it is characterized in that: described anti-leak unit comprises an anti-leak diode, the positive pole of described anti-leak diode is connected with described input voltage, and negative pole connects the collector electrode of described Current amplifier triode.
4. linear voltage stabilization power supply circuits as claimed in claim 3, is characterized in that: described circuit also comprises biasing resistor, described biasing resistor with in parallel after described voltage stabilizing didoe and voltage holding unit be series between described input voltage and ground.
5. linear voltage stabilization power supply circuits as claimed in claim 1 or 2, it is characterized in that: described circuit also comprises filter capacitor, the emitter of described Current amplifier triode connects one end of described filter capacitor, the other end ground connection of described filter capacitor.
6. linear voltage stabilization power supply circuits as claimed in claim 2, is characterized in that: described afterflow electric capacity is made up of multiple capacitances in series.
7. linear voltage stabilization power supply circuits as claimed in claim 2, is characterized in that: described afterflow electric capacity is made up of multiple Capacitance parallel connection.
8. linear voltage stabilization power supply circuits as claimed in claim 7, is characterized in that: described afterflow electric capacity is made up of the Capacitance parallel connection of multiple different capacitance.
9. linear voltage stabilization power supply circuits as claimed in claim 1, is characterized in that: described Current amplifier triode is NPN pipe.
10. linear voltage stabilization power supply circuits as claimed in claim 1, is characterized in that: described voltage stabilizing didoe is avalanche diode or Zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420832539.9U CN204349772U (en) | 2014-12-24 | 2014-12-24 | A kind of linear voltage stabilization power supply circuits |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420832539.9U CN204349772U (en) | 2014-12-24 | 2014-12-24 | A kind of linear voltage stabilization power supply circuits |
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| CN204349772U true CN204349772U (en) | 2015-05-20 |
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| CN201420832539.9U Active CN204349772U (en) | 2014-12-24 | 2014-12-24 | A kind of linear voltage stabilization power supply circuits |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130341A (en) * | 2016-07-13 | 2016-11-16 | 张嵩 | A kind of multifunctional power conversion chip |
| CN111064346A (en) * | 2019-12-17 | 2020-04-24 | 郑州嘉晨电器有限公司 | Linear power supply circuit with wide-range input voltage |
| CN113434002A (en) * | 2021-06-30 | 2021-09-24 | 深圳市长运通半导体技术有限公司 | High-voltage low dropout regulator (LDO) circuit with clamping current-limiting function |
-
2014
- 2014-12-24 CN CN201420832539.9U patent/CN204349772U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130341A (en) * | 2016-07-13 | 2016-11-16 | 张嵩 | A kind of multifunctional power conversion chip |
| CN111064346A (en) * | 2019-12-17 | 2020-04-24 | 郑州嘉晨电器有限公司 | Linear power supply circuit with wide-range input voltage |
| CN113434002A (en) * | 2021-06-30 | 2021-09-24 | 深圳市长运通半导体技术有限公司 | High-voltage low dropout regulator (LDO) circuit with clamping current-limiting function |
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