CN202887043U - Low-dropout voltage stabilizing circuit - Google Patents
Low-dropout voltage stabilizing circuit Download PDFInfo
- Publication number
- CN202887043U CN202887043U CN 201220495916 CN201220495916U CN202887043U CN 202887043 U CN202887043 U CN 202887043U CN 201220495916 CN201220495916 CN 201220495916 CN 201220495916 U CN201220495916 U CN 201220495916U CN 202887043 U CN202887043 U CN 202887043U
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- resistor
- resistance
- amplifier chip
- operational amplifier
- capacitor
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Abstract
The utility model provides a low-dropout voltage stabilizing circuit with the function of voltage stabilization. The low-dropout voltage stabilizing circuit comprises a field-effect tube, an operational amplifier chip, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1, wherein a source electrode of the field-effect tube is connected with an input voltage end, a drain electrode of the field-effect tube is connected with an output end which is connected with the resistor R1 and a non-inverting input end of the operational amplifier chip, an output end of the operational amplifier chip is connected with a grid electrode of the field-effect tube, an inverted input end of the operational amplifier chip is connected with an anti-self-excited circuit which is composed of the resistor R3, the resistor R4 and the capacitor C1, one end of the resistor R2 is connected with the resistor R1 to have a partial pressure effect, and the other end of the resistor R2 is connected with the ground. A partial pressure sampling is output and sent to the non-inverting input end of the operational amplifier chip, a reference input is sent to the inverted input of the operational amplifier chip through the resistor R3, and the anti-self-excited circuit is composed of the resistor R3, the resistor R4 and the capacitor C1. When an output voltage is excessively high, the non-inverting input end of the operational amplifier chip increases, the voltage drop of the field-effect tube increases, and the output drops.
Description
Technical field
The utility model relates to a kind of low voltage difference mu balanced circuit.
Background technology
In the prior art, in the low-voltage, high-current linear stabilized power supply, will stay at least the tube voltage drop of 2V by the Modulating Power pipe, not so output can be unstable.
The utility model content
For solving the problems of the technologies described above, the purpose of this utility model provides the low voltage difference mu balanced circuit of a kind of pressure stabilization function.
Low voltage difference mu balanced circuit of the present utility model, comprise field effect transistor, amplifier chip, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, the source electrode of described field effect transistor connects Input voltage terminal, the drain electrode of field effect transistor connects output terminal, the connection output terminal connects R1 and is connected with the in-phase input end of amplifier chip, the output terminal of amplifier chip is connected with the grid of field effect transistor, and the inverting input of amplifier chip connects an anti-self-excited circuit that is comprised of resistance R 3, resistance R 4, capacitor C 1.
Further, an end contact resistance R1 of described resistance R 2 plays the dividing potential drop effect, the other end ground connection of resistance R 2.
Compared with prior art, the beneficial effects of the utility model are: the in-phase input end of amplifier chip is delivered in the sampling of output dividing potential drop, the reverse input end of amplifier chip is delivered in the benchmark input by R3, the anti-self-excited circuit that resistance R 3, resistance R 4, capacitor C 1 form, when output voltage higher, the normal phase input end of amplifier chip rises, and the field effect transistor pressure drop increases, and output descends.
Description of drawings
Fig. 1 is the circuit diagram of the utility model low voltage difference mu balanced circuit.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for explanation the utility model, but are not used for limiting scope of the present utility model.
As shown in Figure 1, a kind of low voltage difference mu balanced circuit, comprise field effect transistor G, amplifier chip 1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, the source electrode of described field effect transistor G connects Input voltage terminal, the drain electrode of field effect transistor G connects output terminal, the connection output terminal connects R1 and is connected with the in-phase input end of amplifier chip, the output terminal of amplifier chip 1 is connected with the grid of field effect transistor, and the inverting input of amplifier chip 1 connects an anti-self-excited circuit that is comprised of resistance R 3, resistance R 4, capacitor C 1.
Further, an end contact resistance R1 of described resistance R 2 plays the dividing potential drop effect, the other end ground connection of resistance R 2.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (2)
1. low voltage difference mu balanced circuit, it is characterized in that: comprise field effect transistor, amplifier chip, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, the source electrode of described field effect transistor connects Input voltage terminal, the drain electrode of field effect transistor connects output terminal, the connection output terminal connects R1 and is connected with the in-phase input end of amplifier chip, the output terminal of amplifier chip is connected with the grid of field effect transistor, and the inverting input of amplifier chip connects an anti-self-excited circuit that is comprised of resistance R 3, resistance R 4, capacitor C 1.
2. low voltage difference mu balanced circuit according to claim 1, it is characterized in that: an end contact resistance R1 of described resistance R 2 plays the dividing potential drop effect, the other end ground connection of resistance R 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220495916 CN202887043U (en) | 2012-09-21 | 2012-09-21 | Low-dropout voltage stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220495916 CN202887043U (en) | 2012-09-21 | 2012-09-21 | Low-dropout voltage stabilizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202887043U true CN202887043U (en) | 2013-04-17 |
Family
ID=48078449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220495916 Expired - Fee Related CN202887043U (en) | 2012-09-21 | 2012-09-21 | Low-dropout voltage stabilizing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202887043U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106354188A (en) * | 2016-10-18 | 2017-01-25 | 北京无线电计量测试研究所 | Linear regulated power supply and regulation method |
| US10185342B2 (en) | 2016-11-04 | 2019-01-22 | Qualcomm Incorporated | Configurable charge controller |
-
2012
- 2012-09-21 CN CN 201220495916 patent/CN202887043U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106354188A (en) * | 2016-10-18 | 2017-01-25 | 北京无线电计量测试研究所 | Linear regulated power supply and regulation method |
| CN106354188B (en) * | 2016-10-18 | 2019-01-01 | 北京无线电计量测试研究所 | A kind of linear stabilized power supply and method of adjustment |
| US10185342B2 (en) | 2016-11-04 | 2019-01-22 | Qualcomm Incorporated | Configurable charge controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130417 Termination date: 20150921 |
|
| EXPY | Termination of patent right or utility model |