CN204947895U - A kind of power-switching circuit - Google Patents
A kind of power-switching circuit Download PDFInfo
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- CN204947895U CN204947895U CN201520756770.9U CN201520756770U CN204947895U CN 204947895 U CN204947895 U CN 204947895U CN 201520756770 U CN201520756770 U CN 201520756770U CN 204947895 U CN204947895 U CN 204947895U
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Abstract
The utility model provides a kind of power-switching circuit, this circuit comprises low pressure difference linear voltage regulator U, resistance R1, resistance R2, electric capacity C1, electric capacity C2 and electric capacity C4, one end of described electric capacity C1 connects power supply, other end ground connection, the power input pin of described low pressure difference linear voltage regulator U connects power supply, control inputs pin connects power supply, grounding pin ground connection, voltage-regulation pin is by resistance R2 ground connection, the power supply output pin of described low pressure difference linear voltage regulator U is respectively by electric capacity C2 and electric capacity C4 ground connection, one end connection control input pin of described resistance R1, the other end connects power supply output pin, VBAT output interface is provided with between power supply output pin and electric capacity C4.The utility model circuit structure is simple, and output voltage stabilization, can not only meet the voltage request of GPRS module, also can meet its current requirements simultaneously.
Description
Technical field
The utility model relates to field of power supplies, especially relates to a kind of power-switching circuit.
Background technology
Various sophisticated equipment substantially all be unable to do without power supply.Power supply divides according to voltage, can be divided into high voltage source and low-tension supply; Divide according to function, power source special and multiple power source can be divided into.When power supply is powered to components and parts equipment, often need to change supply voltage, to make it the voltage met needed for components and parts.Such as, the voltage that general computer power supply can provide is 5V ,-5V ,+12V ,-12V ,+3.3V, if the voltage needed for components and parts (as GPRS module) is 4V, then power-switching circuit must be had to carry out voltage transitions.But there is following shortcoming in the power-switching circuit structure at present for GPRS module: 1, circuit structure more complicated, 2, voltage can reach requirement, but electric current cannot reach requirement.
Utility model content
The purpose of this utility model is: for prior art Problems existing, provides a kind of power-switching circuit, solve the power-switching circuit complex structure of existing GPRS module, and electric current cannot meet the requirements of problem.
The purpose of this utility model is achieved through the following technical solutions:
A kind of power-switching circuit, it is characterized in that, this circuit comprises low pressure difference linear voltage regulator U, resistance R1, resistance R2, electric capacity C1, electric capacity C2 and electric capacity C4, one end of described electric capacity C1 connects power supply, other end ground connection, the power input pin of described low pressure difference linear voltage regulator U connects power supply, control inputs pin connects power supply, grounding pin ground connection, voltage-regulation pin is by resistance R2 ground connection, the power supply output pin of described low pressure difference linear voltage regulator U is respectively by electric capacity C2 and electric capacity C4 ground connection, one end connection control input pin of described resistance R1, the other end connects power supply output pin, VBAT output interface is provided with between power supply output pin and electric capacity C4.
As further technical scheme, this circuit also comprises electric capacity C3 and VBAT output socket, and ground connection after VBAT output socket series capacitance C3, power supply output pin is connected between electric capacity C3 and VBAT output socket.
As further technical scheme, described electric capacity C2 and electric capacity C4 is electrochemical capacitor, and negative pole end ground connection.
As further technical scheme, the model of described low pressure difference linear voltage regulator U is MIC29152.
Compared with prior art, the utility model circuit structure is simple, and output voltage stabilization, can not only meet the voltage request of GPRS module, also can meet its current requirements simultaneously.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment
The utility model provides a kind of power-switching circuit, and being mainly used in provides power supply to GPRS module, and as shown in Figure 1, this circuit forms primarily of low pressure difference linear voltage regulator U, resistance R1, resistance R2, electric capacity C1, electric capacity C2 and electric capacity C4 its circuit structure.One end of electric capacity C1 connects power supply, other end ground connection.The power input pin of low pressure difference linear voltage regulator U connects power supply, control inputs pin connection power supply, grounding pin ground connection, voltage-regulation pin by resistance R2 ground connection.The power supply output pin of low pressure difference linear voltage regulator U is respectively by electric capacity C2 and electric capacity C4 ground connection.One end connection control input pin, the other end of resistance R1 connect power supply output pin, are provided with VBAT (supply voltage) output interface between power supply output pin and electric capacity C4.
Conveniently be connected with GPRS module, VBAT output socket can be increased on basis of the present utility model.Such needs increase electric capacity C3 and VBAT output socket on circuit, and ground connection after VBAT output socket series capacitance C3, power supply output pin is connected between electric capacity C3 and VBAT output socket.
The model of low pressure difference linear voltage regulator U of the present utility model is MIC29152.Electric capacity C2 and electric capacity C4 adopts electrochemical capacitor, and negative pole end ground connection.
The parameter of each electric capacity of the utility model and resistance according to concrete output voltage and can require that electric current is selected.The utility model is not less than 2A for output voltage 4V, current requirements: the capacitance 0.1uF of electric capacity C1, the resistance value of resistance R1 is that 4000 Europe are female, the resistance value of resistance R2 is that 4000 Europe are female, the capacitance parameter of electric capacity C2 is 1000uF/10V, the capacitance of electric capacity C3 is 0.1uF, and the parameter of electric capacity C4 is 10uF/10V.Resistance R2 can be replaced the resistance of the 2000 Europe mothers that 2 are in series.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; it should be pointed out that all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (4)
1. a power-switching circuit, it is characterized in that, this circuit comprises low pressure difference linear voltage regulator U, resistance R1, resistance R2, electric capacity C1, electric capacity C2 and electric capacity C4, one end of described electric capacity C1 connects power supply, other end ground connection, the power input pin of described low pressure difference linear voltage regulator U connects power supply, control inputs pin connects power supply, grounding pin ground connection, voltage-regulation pin is by resistance R2 ground connection, the power supply output pin of described low pressure difference linear voltage regulator U is respectively by electric capacity C2 and electric capacity C4 ground connection, one end connection control input pin of described resistance R1, the other end connects power supply output pin, VBAT output interface is provided with between power supply output pin and electric capacity C4.
2. power-switching circuit according to claim 1, is characterized in that, this circuit also comprises electric capacity C3 and VBAT output socket, and ground connection after VBAT output socket series capacitance C3, power supply output pin is connected between electric capacity C3 and VBAT output socket.
3. power-switching circuit according to claim 1, is characterized in that, described electric capacity C2 and electric capacity C4 is electrochemical capacitor, and negative pole end ground connection.
4. power-switching circuit according to claim 1, is characterized in that, the model of described low pressure difference linear voltage regulator U is MIC29152.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520756770.9U CN204947895U (en) | 2015-09-28 | 2015-09-28 | A kind of power-switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520756770.9U CN204947895U (en) | 2015-09-28 | 2015-09-28 | A kind of power-switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204947895U true CN204947895U (en) | 2016-01-06 |
Family
ID=55015282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520756770.9U Expired - Fee Related CN204947895U (en) | 2015-09-28 | 2015-09-28 | A kind of power-switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204947895U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107291134A (en) * | 2016-04-01 | 2017-10-24 | 上海华建电力设备股份有限公司 | A kind of GPRS module power circuit |
-
2015
- 2015-09-28 CN CN201520756770.9U patent/CN204947895U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107291134A (en) * | 2016-04-01 | 2017-10-24 | 上海华建电力设备股份有限公司 | A kind of GPRS module power circuit |
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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: 20160106 Termination date: 20190928 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |