CN203812132U - Low-dropout voltage stabilizing circuit with temperature compensation - Google Patents
Low-dropout voltage stabilizing circuit with temperature compensation Download PDFInfo
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- CN203812132U CN203812132U CN201420207922.5U CN201420207922U CN203812132U CN 203812132 U CN203812132 U CN 203812132U CN 201420207922 U CN201420207922 U CN 201420207922U CN 203812132 U CN203812132 U CN 203812132U
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Abstract
The utility model relates to a low-dropout voltage stabilizing circuit with temperature compensation. The low-dropout voltage stabilizing circuit with temperature compensation comprises a constant current circuit, a differential voltage circuit and a compensation feedback circuit, wherein the constant current circuit is used for achieving a high ripple rejection ratio, the differential voltage circuit is used for achieving low differential voltage stabilization, and the compensation feedback circuit is used for guaranteeing that an output voltage is stabilized when wide-range temperature change of the low-dropout voltage stabilizing circuit occurs. The input end of a power source is connected with the input end of the differential voltage circuit and connected with the power source driving end of the compensation feedback circuit through the constant current circuit, the output end of the differential voltage circuit is connected with the input end of the compensation feedback circuit, and the output end of the compensation feedback circuit is connected with the output end of the power source. The lowest dropout voltage of the low-dropout voltage stabilizing circuit with temperature compensation is a saturation voltage of a PNP triode, and therefore the dropout voltage can be low. It is guaranteed that even if the voltage of the automobile-end power source is reduced to 9 V, a power circuit can still guarantee supply of electricity above 8 V. Meanwhile, the constant current circuit and the voltage stabilization feedback circuit with temperature compensation are matched, and it can be guaranteed that the output voltage of the power source can still be kept within a specified range when the wide-range temperature change of the low-dropout voltage stabilizing circuit occurs.
Description
Technical field
The utility model relates to a kind of mu balanced circuit, particularly a kind of low voltage difference mu balanced circuit with temperature compensation for vehicle-mounted product.
Background technology
Vehicle mounted multimedia product, the accumulator of general power taking on automobile.At some in particular cases, such as automobile is in igniting, the voltage of accumulator can decline, may there is the situation lower than 9V, and in a lot of situations, require vehicle mounted multimedia product at automobile storage battery voltage drop in 9V, still need to guarantee normal work.On the other hand, the IC that some are vehicle-mounted, such as some audio frequency processing IC, or Tuner IC etc., normal operating voltage representative value is 8.5V, minimum is 8V.When accumulator only has 9V power supply, guarantee at least power supply of 8V of this class IC to media product, the pressure reduction design of Zhe Dui supply line has proposed higher requirement.In addition, as in-vehicle multi-media system, in order to guarantee user's experience and comfortableness, the performances such as tonequality of vehicle-mounted product are had to higher requirement.Now, in the processing of power supply, need to guarantee certain Ripple Suppression ratio, guarantee the stable of power supply.Moreover, because automobile is in use often directly exposed in outdoor environment, on car, the temperature of the working environment of equipment has great variation, conventionally require under the environment of-20 ℃ to 70 ℃, vehicle mounted multimedia product must normally be worked, and ensure certain performance, this temperature characterisitic to media product has proposed higher requirement.
Summary of the invention
The purpose of this utility model is in order to overcome the defect of above-mentioned background technology, and a kind of head-up display device that can switch as required display mode is provided.
A low voltage difference mu balanced circuit with temperature compensation, is characterized in that, comprising:
Constant-current circuit, reaches higher ripple rejection ratio.
Differential pressure circuit, realizes low differential pressure voltage stabilizing.
Voltage stabilizing feedback circuit, guarantees circuit regulated output voltage when temperature change on a large scale.
Wherein, power input connects described differential pressure circuit input end, and be connected with described voltage stabilizing feedback circuit power drives end by described constant-current circuit, described differential pressure circuit output end is connected with described voltage stabilizing feedback circuit input end, and described voltage stabilizing feedback circuit output terminal connects power output end.
Further, described constant-current circuit comprises diode, the first triode and first, second resistance; Described power input forward connects the first resistance after connecting diode, then ground connection; Described the first transistor base connects the node between described diode and the first resistance; After connecting the second resistance, described the first transistor emitter connects power input.
Further, described differential pressure circuit comprises the second triode, voltage stabilizing diode and the 3rd resistance, and described the second transistor emitter connects described power input, and described the 3rd resistance two ends connect respectively base stage and the emitter of described the second triode; Described voltage stabilizing diode negative pole is connected with described the second transistor base by voltage stabilizing feedback circuit, plus earth.
Preferably, described voltage stabilizing feedback circuit comprises the 4th, the 5th, the 6th and the 7th resistance and the 3rd, the 4th triode; The collector of described the 3rd triode is connected with voltage stabilizing diode negative pole with the base stage of described the second triode respectively with base stage, and described the 4th resistance one end connects described the 3rd transistor emitter and the 4th transistor emitter, other end ground connection; Described the 4th transistor collector connects the second transistor collector by the 5th resistance; One end ground connection after described the 6th resistance and the series connection of the 7th resistance, another termination power output end, and the node between two resistance is connected with the base stage of the 4th triode.
Further, the electric capacity that connects a ground connection on the node between described the 3rd transistor base and voltage stabilizing diode negative pole.
Preferably, described voltage stabilizing feedback circuit also comprises an electric capacity, and described electric capacity is in parallel with described the 6th resistance.
Preferably, described power input and power output end place are connected with the filter capacitor of a ground connection.
Low voltage difference mu balanced circuit with temperature compensation of the present utility model, minimum pressure reduction is exactly the saturation voltage of PNP triode, thereby can realize low voltage difference.Even if guarantee that automobile end power supply is reduced to 9V, this power circuit still can guarantee power supply more than 8V.Coordinate simultaneously constant-current source circuit with the voltage stabilizing feedback circuit of temperature compensation, can guarantee that circuit is when temperature change on a large scale, electric power output voltage still can keep within the limits prescribed.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the utility model one embodiment.
Fig. 2 is the physical circuit figure of the utility model one embodiment.
Embodiment
Below in conjunction with accompanying drawing, a kind of double mode head-up display device of the present utility model is further described.
A kind of low voltage difference differential pressure circuit 2 with temperature compensation of the utility model, for vehicle mounted multimedia electric power system, it mainly comprises:
Constant-current circuit 1, reaches higher ripple rejection ratio.
Differential pressure circuit 2, realizes low differential pressure voltage stabilizing.
Voltage stabilizing feedback circuit 3, guarantees circuit regulated output voltage when temperature change on a large scale.
Wherein, power input Vin connects differential pressure circuit 2 input ends, is provided for the primary voltage of conversion, and is connected with voltage stabilizing feedback circuit 1 power drives end by constant-current circuit 3, is the power supply of voltage stabilizing feedback circuit.Differential pressure circuit 2 output terminals are connected with described voltage stabilizing feedback circuit 1 input end, and voltage stabilizing feedback circuit 1 output terminal connects power output end Vout.
Concrete, constant-current circuit 1 comprises two diode D1, D2, triode T1 and two resistance R 1, R2; After diode D1, the D2 of two series connection of power input Vin forward connection, be connected last ground connection with the first resistance R 1.The first transistor base connects the node between described diode and the first resistance R 1.The first transistor emitter connects the rear connection power input of the second resistance R 2 Vin.In order to obtain comparatively constant electric current, first, utilize the pressure drop of two diode D1, D2, base bias is provided.The effect of the first resistance R 1 is for forming path, now, two diode D1, D2 and the first resistance R 1 combine and will form a similar relation to tubular construction with the first triode T1, therefore the collector current of the first triode T1 will equate with the electric current flowing through in the first resistance R 1, simultaneously because externally fed voltage is much larger than diode drop, no matter how the load (i.e. the second resistance R 2) in the first triode branch road changes, the output current Io of the first transistor collector all can be approximated to be Vin/R1, so, this partial circuit forms constant current source, for differential pressure circuit 2 and voltage stabilizing feedback circuit 3 provide a stable drive current, reach higher ripple rejection ratio.
Aspect differential pressure circuit 2, it comprises a triode T2, a voltage stabilizing diode Z1 and a resistance R 3.Wherein, the second triode T2 emitter connects power input Vin, and the 3rd resistance R 3 two ends connect respectively base stage and the emitter of the second triode T2; Voltage stabilizing diode Z1 negative pole is connected with the second triode T2 base stage by voltage stabilizing feedback circuit, plus earth.In a preferred case, for elimination clutter, on the node between the 3rd transistor base T3 and voltage stabilizing diode Z1 negative pole, connect the capacitor C 1 of a ground connection.During the utility model work, after the drive current that obtains constant-current circuit 1 of voltage stabilizing diode Z1, its negative pole is exported a stable voltage, is 5.1V in the present embodiment.After this voltage coordinates with voltage stabilizing feedback circuit 3, will make voltage through temperature compensation of differential pressure circuit 2 output, the pressure reduction of input voltage and output voltage is that the saturation voltage of the second triode T2 is poor.
Due in actual applications, the impact of automobilism heating and environment, the operating ambient temperature of general mu balanced circuit changes greatly, this easily causes each inter-electrode voltage of triode to have a greater change, the second triode T2 can be in the situation that the rising of temperature or reduction, the poor reduction of saturation voltage or rising, make mu balanced circuit occur that temperature floats phenomenon.In order to eliminate the impact of this phenomenon, the utility model has also added voltage stabilizing feedback circuit 3.This voltage stabilizing feedback circuit comprises four resistance and two triodes.Wherein, the 3rd triode T3 collector is connected with the collector of the 4th triode T4, finally, by the 4th resistance R 4 ground connection, forms one to tubular construction.In addition, the collector of the 3rd triode T3 is connected with voltage stabilizing diode Z1 negative pole with the base stage of the second triode T2 respectively with base stage, and the 4th triode T4 collector connects the second triode T2 collector by the 5th resistance R 5.One end ground connection after the 6th resistance R 6 and the series connection of the 7th resistance R 7, another termination power output end Vout, and the node between resistance R 6, R7 is connected with the base stage of the 4th triode T4.
Preferably, voltage stabilizing feedback circuit also comprises a capacitor C 2, and capacitor C 2 is in parallel with the 6th resistance R 6.
Because the 3rd triode T3 and the 4th triode T4 have formed tubular construction, according to the characteristic to tubular construction, the 3rd triode T3 collector equates with the 4th triode T4 collector voltage, the collector voltage of the 3rd triode T3 is provided by voltage stabilizing diode Z1, so the collector voltage of the 4th triode T4 will be in a stationary value, again because resistance temperature influence is less, as long as adjust the resistance of the 6th resistance R 6 and the 7th resistance R 7, can control the voltage drop value of the 6th resistance R 6, when the pressure reduction temperature influence of triode, because on PCB circuit board during layout circuit, the 3rd triode T3 and the 4th triode T4 cloth local very close to, temperature influence is approximately uniform, so, the pressure drop of the 6th resistance R 6 can not be subject to temperature variation and produce fluctuation.
Preferably, for better elimination clutter, power input Vin and power output end Vout place are connected with the filter capacitor of a ground connection.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (7)
1. with a low voltage difference mu balanced circuit for temperature compensation, it is characterized in that, comprising:
Realize the constant-current circuit of higher ripple rejection ratio;
Realize the differential pressure circuit of low differential pressure voltage stabilizing;
Guarantee the voltage stabilizing feedback circuit of circuit regulated output voltage when temperature change on a large scale;
Power input connects described differential pressure circuit input end, and be connected with described voltage stabilizing feedback circuit power drives end by described constant-current circuit, described differential pressure circuit output end is connected with described voltage stabilizing feedback circuit input end, and described voltage stabilizing feedback circuit output terminal connects power output end.
2. low voltage difference mu balanced circuit as claimed in claim 1, is characterized in that: described constant-current circuit comprises diode, the first triode and first, second resistance; Described power input forward connects the first resistance after connecting diode, then ground connection; Described the first transistor base connects the node between described diode and the first resistance; After connecting the second resistance, described the first transistor emitter connects power input.
3. low voltage difference mu balanced circuit as claimed in claim 1, it is characterized in that: described differential pressure circuit comprises the second triode, voltage stabilizing diode and the 3rd resistance, described the second transistor emitter connects described power input, and described the 3rd resistance two ends connect respectively base stage and the emitter of described the second triode; Described voltage stabilizing diode negative pole is connected with described the second transistor base by voltage stabilizing feedback circuit, plus earth.
4. low voltage difference mu balanced circuit as claimed in claim 3, is characterized in that: described voltage stabilizing feedback circuit comprises the 4th, the 5th, the 6th and the 7th resistance and the 3rd, the 4th triode; The collector of described the 3rd triode is connected with voltage stabilizing diode negative pole with the base stage of described the second triode respectively with base stage, and described the 4th resistance one end connects described the 3rd transistor emitter and the 4th transistor emitter, other end ground connection; Described the 4th transistor collector connects the second transistor collector by the 5th resistance; One end ground connection after described the 6th resistance and the series connection of the 7th resistance, another termination power output end, and the node between two resistance is connected with the base stage of the 4th triode.
5. low voltage difference mu balanced circuit as claimed in claim 4, is characterized in that: the electric capacity that connects a ground connection on the node between described the 3rd transistor base and voltage stabilizing diode negative pole.
6. the low voltage difference mu balanced circuit as described in claim 4, is characterized in that: described voltage stabilizing feedback circuit also comprises an electric capacity, and described electric capacity is in parallel with described the 6th resistance.
7. low voltage difference mu balanced circuit as claimed in claim 1, is characterized in that: described power input and power output end place are connected with the filter capacitor of a ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420207922.5U CN203812132U (en) | 2014-04-28 | 2014-04-28 | Low-dropout voltage stabilizing circuit with temperature compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420207922.5U CN203812132U (en) | 2014-04-28 | 2014-04-28 | Low-dropout voltage stabilizing circuit with temperature compensation |
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| CN203812132U true CN203812132U (en) | 2014-09-03 |
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| CN201420207922.5U Expired - Fee Related CN203812132U (en) | 2014-04-28 | 2014-04-28 | Low-dropout voltage stabilizing circuit with temperature compensation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107708037A (en) * | 2017-11-08 | 2018-02-16 | 深圳市沃特沃德股份有限公司 | The control method and device of portable loudspeaker box |
| CN108321782A (en) * | 2018-01-15 | 2018-07-24 | 宁波普瑞均胜汽车电子有限公司 | A kind of electric power output voltage protection circuit |
| CN108829170A (en) * | 2018-07-11 | 2018-11-16 | 深圳开立生物医疗科技股份有限公司 | A kind of linear voltage-stabilizing circuit with overcurrent protection |
| CN112711290A (en) * | 2020-12-23 | 2021-04-27 | 杭州晶华微电子股份有限公司 | Semiconductor integrated circuit and temperature drift compensation method for semiconductor integrated circuit |
-
2014
- 2014-04-28 CN CN201420207922.5U patent/CN203812132U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107708037A (en) * | 2017-11-08 | 2018-02-16 | 深圳市沃特沃德股份有限公司 | The control method and device of portable loudspeaker box |
| CN107708037B (en) * | 2017-11-08 | 2020-08-18 | 深圳市沃特沃德股份有限公司 | Control method and device of portable sound box |
| CN108321782A (en) * | 2018-01-15 | 2018-07-24 | 宁波普瑞均胜汽车电子有限公司 | A kind of electric power output voltage protection circuit |
| CN108829170A (en) * | 2018-07-11 | 2018-11-16 | 深圳开立生物医疗科技股份有限公司 | A kind of linear voltage-stabilizing circuit with overcurrent protection |
| CN108829170B (en) * | 2018-07-11 | 2024-04-16 | 深圳开立生物医疗科技股份有限公司 | Linear voltage stabilizing circuit with overcurrent protection |
| CN112711290A (en) * | 2020-12-23 | 2021-04-27 | 杭州晶华微电子股份有限公司 | Semiconductor integrated circuit and temperature drift compensation method for semiconductor integrated circuit |
| CN112711290B (en) * | 2020-12-23 | 2022-05-13 | 杭州晶华微电子股份有限公司 | Semiconductor integrated circuit and temperature drift compensation method for semiconductor integrated circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20150428 |
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| EXPY | Termination of patent right or utility model |