CN101604840A - A kind of low cost high-voltage input step-down power supply - Google Patents
A kind of low cost high-voltage input step-down power supply Download PDFInfo
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- CN101604840A CN101604840A CNA2009101503651A CN200910150365A CN101604840A CN 101604840 A CN101604840 A CN 101604840A CN A2009101503651 A CNA2009101503651 A CN A2009101503651A CN 200910150365 A CN200910150365 A CN 200910150365A CN 101604840 A CN101604840 A CN 101604840A
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- voltage
- power supply
- input
- pressure limiting
- series connection
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Abstract
The invention provides a kind of low cost high-voltage input step-down power supply, before the voltage-dropping type power circuit, add one-level series connection pressure limiting circuit, the series connection pressure limiting circuit suppresses the transient surge voltage that input supply voltage exists, the high voltage of outside input is decayed to an acceptable scope, for the voltage-dropping type power circuit provides the power supply input, the present invention can improve the maximum input voltage value of the built-in voltage-dropping type power supply of common MOSFET at lower cost, is used for the power supply on vehicle field.
Description
Technical field
The invention belongs to the automobile power source design field, is a kind of low-cost voltage dropping power supply of realizing high input voltage.
Background technology
The electronic equipment that in the automotive electrical system environment of complexity, moves, requirement can be born high input surge voltage, maximum input voltage is the important parameter of design vehicle electronic product power-supply system, in order to satisfy automobile electronics complex work environment requirement, usually select the power management chip of some high withstand voltages for use, and the price of these high withstand voltage power management chips is relatively more expensive comparatively speaking.
Summary of the invention
The present invention is a kind of supply unit that obtains high power supply input withstand voltage with low cost.In order to improve the maximum input voltage value of the built-in voltage-dropping type power supply of common MOSFET, before the voltage-dropping type power circuit, add one-level series connection pressure limiting circuit.The series connection pressure limiting circuit decays to an acceptable scope with the high voltage of outside input, and the voltage-dropping type power circuit is shielded.The mode of this kind series connection pressure limiting circuit and the cascade of voltage-dropping type power circuit is compared with the power circuit that the power management chip of the high withstand voltage of simple use is formed, and can significantly reduce circuit cost, has practical value.
The present invention realizes principle: whole power supply is made up of series connection pressure limiting circuit and voltage-dropping type power circuit.The series connection pressure limiting circuit is used to suppress the transient surge voltage that input supply voltage exists, and also can realize the step-down of certain amplitude to stable voltage; The voltage-dropping type power circuit is used for the voltage of series connection pressure limiting circuit output is reduced to a stable magnitude of voltage, and the voltage-dropping type power circuit can be the switching mode voltage-dropping power supply circuit, also can be linear power supply circuit and other some voltage-dropping type power circuits.When outside input power source voltage was lower than series connection pressure limiting circuit voltage stabilizing value, the Darlington transistor of series connection pressure limiting circuit was in the saturation conduction state, and the energy that consumes this moment on the series connection pressure limiting circuit is less.When there was destructive surge voltage in outside input power source voltage or is higher than the voltage stabilizing value of the pressure limiting circuit of connecting, the series connection pressure limiting circuit decayed to an acceptable fixed value with surge voltage, thereby realized the protection to back voltage-dropping type power circuit.
The invention has the beneficial effects as follows: improved the maximum input voltage value of voltage-dropping type power supply, series connection pressure limiting circuit cost is lower, makes cost of the present invention be lower than single high voltage power supply circuit cost.
Description of drawings
Fig. 1---low cost high-voltage input step-down power supply structure chart
The 1--pressure limiting circuit of connecting, 2--voltage-dropping type power circuit
Fig. 2---series connection pressure limiting circuit structure chart
The 3--Darlington transistor, 4--electric capacity, 5--Zener diode, 6--resistance
Embodiment
VIN joins with outside input positive source, and GND joins with outside input power cathode.VOUT exports from GND through adjusted power cathode for through adjusted output voltage positive pole.When external input voltage is lower than the voltage of voltage regulation of series connection pressure limiting circuit, Zener diode (5) is equivalent to open circuit, Darlington transistor (3) conducting, emitter output voltage values equal outside input supply voltage value and deduct the collector electrode of Darlington transistor and the saturation voltage drop between the emitter.When external input voltage is higher than the puncture voltage of Zener diode (5), this pipe conducting also clamps the voltage at its specified voltage of voltage regulation value, Darlington transistor (3) emitter output voltage is approximately a burning voltage, size equals Zener diode voltage stabilizing value and deducts the base stage of Darlington transistor and the tube voltage drop between the emitter, thereby can play restriction to the surge voltage of outside input, significantly improve the voltage input step-down of whole power circuit, the voltage of Darlington transistor emitting stage output is exported to voltage-dropping type power circuit (2) later on through capacitor decoupling, and the voltage-dropping type power circuit is realized hypotensive effect.
Claims (3)
1, a kind of low cost high-voltage input step-down power supply is characterized in that being made up of series connection pressure limiting circuit and voltage-dropping type power circuit.
2, low cost high-voltage input step-down power supply as claimed in claim 1, it is characterized in that its series connection pressure limiting circuit form by Zener diode, Darlington transistor, resistance and electric capacity.
3, low cost high-voltage input step-down power supply as claimed in claim 1, it is characterized in that connecting in the pressure limiting circuit, the positive pole of Zener diode and the base stage of Darlington transistor are joined, the negative pole of Zener diode joins with reference ground, one end of resistance joins with the input positive source, the base stage of the other end and Darlington transistor is joined, the collector electrode of Darlington transistor joins with the positive pole of input power supply, one end of electric capacity links to each other with the emitter of Darlington transistor, the other end joins with reference ground, and the output of series connection pressure limiting circuit is as the input of voltage-dropping type power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101503651A CN101604840A (en) | 2009-06-23 | 2009-06-23 | A kind of low cost high-voltage input step-down power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101503651A CN101604840A (en) | 2009-06-23 | 2009-06-23 | A kind of low cost high-voltage input step-down power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101604840A true CN101604840A (en) | 2009-12-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009101503651A Pending CN101604840A (en) | 2009-06-23 | 2009-06-23 | A kind of low cost high-voltage input step-down power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101604840A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460815A (en) * | 2014-04-30 | 2015-03-25 | 贵州航天凯山石油仪器有限公司 | High-temperature, wide-input and high-precision power source |
| CN107994546A (en) * | 2017-12-15 | 2018-05-04 | 南京理工大学 | A kind of AGV bridge-type motor drivers |
-
2009
- 2009-06-23 CN CNA2009101503651A patent/CN101604840A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460815A (en) * | 2014-04-30 | 2015-03-25 | 贵州航天凯山石油仪器有限公司 | High-temperature, wide-input and high-precision power source |
| CN107994546A (en) * | 2017-12-15 | 2018-05-04 | 南京理工大学 | A kind of AGV bridge-type motor drivers |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20091216 |