CN203673378U - Low-dropout direct-current stabilized power supply circuit - Google Patents
Low-dropout direct-current stabilized power supply circuit Download PDFInfo
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- CN203673378U CN203673378U CN201320824348.3U CN201320824348U CN203673378U CN 203673378 U CN203673378 U CN 203673378U CN 201320824348 U CN201320824348 U CN 201320824348U CN 203673378 U CN203673378 U CN 203673378U
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Abstract
The utility model provides a low-dropout direct-current stabilized power supply circuit which is mainly composed of two reference voltage source chips TL431 and a power triode. The low-dropout direct-current stabilized power supply circuit is high in accuracy, output voltage is adjustable, and output power is easy to adjust. Input and output voltage is wide in adjustment range, the stabilized power supply circuit is good in output accuracy, high in conversion efficiency and small in heating value, has a great price advantage and can serve as the power supply design circuit part of various electronic products and ensure reliable long-term operation of electronic circuits. The low-dropout direct-current stabilized power supply circuit has the following advantages that the input voltage range is wide and can reach 3 V to 37 V; the adjusting range of the output voltage is wide, high-accuracy output resistance divided voltage is used for output, the output voltage can be adjusted conveniently, and the adjusting range can reach 3 V to approximate 37 V; input and output voltage difference can be a fraction of one volt to over 30V, and the range is larger than that of a common switch type stabilized power supply or a linear stabilized power supply.
Description
Technical field
The utility model relates to a kind of power circuit, especially a kind of low voltage difference DC-stabilized circuit.
Background technology
Mu balanced circuit can still can keep the constant circuit of output voltage in the time that input voltage, load, environment temperature, circuit parameter etc. change.Sort circuit can provide galvanic current source, by various electronic equipments are applied.
Comparatively widely used power circuit has at present: linear stabilized power supply and switching power supply.Linear voltage-stabilized power supply circuit, typical device is LM78XX series, its feature has: heating is large, and efficiency is low.The typical device of switching power supply is LM257X, and the feature in its application has: need high-power inductance, output voltage ripple is large, and cost is high.
Utility model content
The purpose of this utility model is to provide a kind of low voltage difference DC-stabilized circuit, has realized a kind of wide input and output voltage, low voltage difference, high efficiency DC-stabilized circuit.The technical solution adopted in the utility model is:
A kind of low voltage difference DC-stabilized circuit:
Comprise a capacitor C 1, the positive pole of capacitor C 1 connects the emitter of PNP triode Q1, one end of resistance R 1, one end of resistance R 3, the minus earth of capacitor C 1;
The base stage of another termination PNP triode Q1 of resistance R 1, and connect the negative electrode of reference voltage source chip U1 by resistance R 2; The collector of PNP triode Q1 is as the output terminal of this DC-stabilized circuit;
The negative electrode of another termination reference voltage source chip U2 of resistance R 3, and connect the reference edge of reference voltage source chip U1 by resistance R 4; The anode of reference voltage source chip U1 connects the anode of diode D1, the plus earth of diode D1; Capacitor C 4 is connected in parallel between the reference edge and ground of reference voltage source chip U1;
The collector of one termination PNP triode Q1 of resistance R 5, the other end is by resistance R 6 ground connection, and the connected node of resistance R 5 and R6 connects the reference edge of reference voltage source chip U2; The plus earth of reference voltage source chip U2;
Further, described reference voltage source chip U1 and U2 all adopt TL431 reference voltage source chip.
Further, the value of described capacitor C 1 is 100uF.
Further, the value of described capacitor C 3 is 100nF, and the value of capacitor C 2 is 1000uF.
The circuit that provided by the utility model is a kind of high precision, output voltage is adjustable, output power easily regulates.Input and output voltage range of adjustment is wide, and circuit output accuracy is good, and conversion efficiency is high, and thermal value is little, and has very large price advantage, can, as the Power Management Design circuit part of various electronic products, guarantee the highly reliable long-time running of electronic circuit.Specifically, possess following advantage:
1) wide input voltage range, can reach 3V～37V.
2) output voltage range of adjustment is wide, and output has been used high-precision output resistance dividing potential drop, regulation output voltage easily, and range of adjustment can reach 3V to approaching 37V.
3) input and output voltage poor can from zero point several volts until 30V many, larger than general switching mode voltage stabilizer or linear stabilized power supply scope.
4) this circuit design exquisiteness, components and parts are few, and thermometrically is convenient.
Accompanying drawing explanation
Fig. 1 is for being schematic diagram of the present utility model.
The inside schematic diagram that Fig. 2 is TL431.
Embodiment
Below in conjunction with concrete drawings and Examples, the utility model is described in further detail.
As shown in Figure 1: low voltage difference DC-stabilized circuit provided by the utility model, comprise a capacitor C 1, the positive pole of capacitor C 1 connects the emitter of PNP triode Q1, one end of resistance R 1, one end of resistance R 3, the minus earth of capacitor C 1; The base stage of another termination PNP triode Q1 of resistance R 1, and connect the negative electrode of reference voltage source chip U1 by resistance R 2; The collector of PNP triode Q1 is as the output terminal of this DC-stabilized circuit; The negative electrode of another termination reference voltage source chip U2 of resistance R 3, and connect the reference edge of reference voltage source chip U1 by resistance R 4; The anode of reference voltage source chip U1 connects the anode of diode D1, the plus earth of diode D1; Capacitor C 4 is connected in parallel between the reference edge and ground of reference voltage source chip U1; The collector of one termination PNP triode Q1 of resistance R 5, the other end is by resistance R 6 ground connection, and the connected node of resistance R 5 and R6 connects the reference edge of reference voltage source chip U2; The plus earth of reference voltage source chip U2; Capacitor C 3 is connected in parallel between the collector and ground of PNP triode Q1, and the positive pole of capacitor C 2 connects the collector of PNP triode Q1, minus earth.
Reference voltage source chip U1 and U2 all adopt TL431 reference voltage source chip.
As shown in Figure 2, there is a reference voltage V ref TL431 inside, is 2.5V.The anode of U1 is owing to having connected a diode, and therefore the inside Vref of U1 is the equal of 2.5V+0.7V=3.2V.The variation of output voltage V o, after resistance R 5, R6 sampling, is added in the reference edge of U2, compares with the 2.5V reference voltage V ref of its inside.
Principle of work is as follows:
When output voltage V o increases, while making the sampling voltage at resistance R 5, R6 connected node place be greater than Vref, U2(TL431) negative electrode be low level (2V).Now, U1(TL431) reference voltage terminal be also low level (2V), be less than the absolute reference voltage 3.2V of U1 inside.Now, the negative electrode of U1 is off-state, and the base stage of triode Q1 can not have electric current due to the disconnection of U1.Now, the collector and emitter cut-off of triode Q1, input voltage and output voltage disconnect, and the voltage of output terminal only depends on the energy storage in capacitor C 2 to maintain, and therefore will decline.
In the time that sampling voltage is less than Vref, U2(TL431) negative electrode be off-state.Now, U1(TL431) reference voltage terminal be connected with input voltage by resistance R 3, R4.In the time that input voltage is greater than the absolute reference voltage 3.2V of U1, the negative electrode of U1 is low level.Now, the base current of Q1 can produce by input voltage and R2, triode Q1 conducting, and be tending towards state of saturation, in the time of state of saturation the collector and emitter pressure drop of triode Q1 less, power consumption is less.Now, input voltage is conducting to output voltage terminal by triode Q1.
So constantly repeatedly, make output voltage keep stable.
In circuit, U2 has formed an equivalent voltage stabilizing diode together with R5, R6.The dividing potential drop of output voltage on R6 is 2.5V.The different values of resistance R 5, R6 can regulation output voltage value.
The effect of diode D1 is the reference voltage of raising U1, to strengthen as U2(TL431) the voltage difference of negative electrode during as low level (2V), make performance more reliable and more stable.
The effect of capacitor C 1 is used for input voltage to carry out energy storage and filtering.The effect of capacitor C 2, C3 is carried out energy storage and filtering to output voltage.The effect of capacitor C 4 is the input reference voltage filtering to U1.The value of capacitor C 1 is 100uF, can adopt electrochemical capacitor.The value of capacitor C 3 is 100nF, and the value of capacitor C 2 is 1000uF, and C2 can adopt electrochemical capacitor.
This circuit can be applied in the large power supply that output power is larger and use, and can under little electric current (<100mA) occasion, apply as three-terminal voltage regulator again.
The utility model has formed wide input and output voltage, low voltage difference, high-level efficiency DC-stabilized circuit by accurate reference voltage chip TL431 and pliotron.
Claims (4)
1. a low voltage difference DC-stabilized circuit, is characterized in that:
Comprise a capacitor C 1, the positive pole of capacitor C 1 connects the emitter of PNP triode Q1, one end of resistance R 1, one end of resistance R 3, the minus earth of capacitor C 1;
The base stage of another termination PNP triode Q1 of resistance R 1, and connect the negative electrode of reference voltage source chip U1 by resistance R 2; The collector of PNP triode Q1 is as the output terminal of this DC-stabilized circuit;
The negative electrode of another termination reference voltage source chip U2 of resistance R 3, and connect the reference edge of reference voltage source chip U1 by resistance R 4; The anode of reference voltage source chip U1 connects the anode of diode D1, the plus earth of diode D1; Capacitor C 4 is connected in parallel between the reference edge and ground of reference voltage source chip U1;
The collector of one termination PNP triode Q1 of resistance R 5, the other end is by resistance R 6 ground connection, and the connected node of resistance R 5 and R6 connects the reference edge of reference voltage source chip U2; The plus earth of reference voltage source chip U2;
Capacitor C 3 is connected in parallel between the collector and ground of PNP triode Q1, and the positive pole of capacitor C 2 connects the collector of PNP triode Q1, minus earth.
2. low voltage difference DC-stabilized circuit as claimed in claim 1, is characterized in that:
Described reference voltage source chip U1 and U2 all adopt TL431 reference voltage source chip.
3. low voltage difference DC-stabilized circuit as claimed in claim 1 or 2, is characterized in that: the value of described capacitor C 1 is 100uF.
4. low voltage difference DC-stabilized circuit as claimed in claim 1 or 2, is characterized in that: the value of described capacitor C 3 is 100nF, and the value of capacitor C 2 is 1000uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320824348.3U CN203673378U (en) | 2013-12-12 | 2013-12-12 | Low-dropout direct-current stabilized power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320824348.3U CN203673378U (en) | 2013-12-12 | 2013-12-12 | Low-dropout direct-current stabilized power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203673378U true CN203673378U (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320824348.3U Expired - Fee Related CN203673378U (en) | 2013-12-12 | 2013-12-12 | Low-dropout direct-current stabilized power supply circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375544A (en) * | 2014-08-01 | 2015-02-25 | 重庆工商职业学院 | Timing sequence DC electrical source for millimeter wave amplifier |
| CN109995018A (en) * | 2017-12-29 | 2019-07-09 | 上海亿盟电气自动化技术有限公司 | A kind of low pressure controller High-reliability power source circuit |
| CN112578838A (en) * | 2020-12-25 | 2021-03-30 | 深圳市艾尔曼医疗电子仪器有限公司 | Adjustable programmable high-voltage reference unit circuit and adjustable high-voltage reference source |
| CN113075951A (en) * | 2021-04-07 | 2021-07-06 | 无锡市欧瑞杰电子科技有限公司 | Pre-voltage stabilizing circuit and power supply |
-
2013
- 2013-12-12 CN CN201320824348.3U patent/CN203673378U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375544A (en) * | 2014-08-01 | 2015-02-25 | 重庆工商职业学院 | Timing sequence DC electrical source for millimeter wave amplifier |
| CN109995018A (en) * | 2017-12-29 | 2019-07-09 | 上海亿盟电气自动化技术有限公司 | A kind of low pressure controller High-reliability power source circuit |
| CN112578838A (en) * | 2020-12-25 | 2021-03-30 | 深圳市艾尔曼医疗电子仪器有限公司 | Adjustable programmable high-voltage reference unit circuit and adjustable high-voltage reference source |
| CN113075951A (en) * | 2021-04-07 | 2021-07-06 | 无锡市欧瑞杰电子科技有限公司 | Pre-voltage stabilizing circuit and power supply |
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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: 20140625 Termination date: 20191212 |
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| CF01 | Termination of patent right due to non-payment of annual fee |