CN202503438U - Switching circuit for multi-path output voltage of mobile power supply - Google Patents
Switching circuit for multi-path output voltage of mobile power supply Download PDFInfo
- Publication number
- CN202503438U CN202503438U CN2012201615461U CN201220161546U CN202503438U CN 202503438 U CN202503438 U CN 202503438U CN 2012201615461 U CN2012201615461 U CN 2012201615461U CN 201220161546 U CN201220161546 U CN 201220161546U CN 202503438 U CN202503438 U CN 202503438U
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- China
- Prior art keywords
- power supply
- output voltage
- control chip
- resistance
- main control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
Disclosed is a switching circuit for the multi-path output voltage of a mobile power supply, comprising a master control chip and a power supply IC having adjustable output voltage, wherein the feedback terminal of the power supply IC is connected with a resistor branch circuit; the resistor branch circuit is connected with the master control chip; the input resistor of the feedback terminal of the power supply IC is adjusted via the control of the master control chip, thus to realize the transition of the output voltage; the resistor branch circuit comprises a first, second, and third resistors as well as a triode; the first and second resistors are serially connected between the power supply and the ground, with the serial connection points thereof being connected with the feedback terminal of the power supply IC; one end of the third resistor is connected with a power supply, with the other end thereof being connected with the collector electrode of the triode; and the triode emitter electrode is grounding, with the base electrode being connected with the master control chip via a current-limiting resistor. The switching circuit of the utility model, with a simple structure, reduces a transformer compared to the conventional multi-path output voltage scheme, thereby reducing the cost, decreasing the PCB area, facilitating the miniaturization of the product, having lower standby power consumption, and being energy saving and environment-friendly.
Description
Technical field
The utility model relates to a kind of portable power source, refers in particular to a kind of output voltage commutation circuit of portable power source.
Background technology
Charge power supply or external power supply that portable power source can be used as digital electronic goods such as mobile phone, digital camera, DV, notebook computer, PDA, PSP, MP3/MP4 use; The logarithmic code product repeatedly charges, also the logarithmic code product carries out the long-time continuous power supply but get final product, and can solve digital product in the problem that does not have can't charge under the civil power condition and can not work long hours.But above-mentioned electronic equipment has nothing in common with each other to the demand of input voltage, comprises 5V, 9V, 12V, 16V, 19V or the like, and therefore the portable power source product for their power supplies also must have multichannel output, and simple as much as possible, efficient, low-cost.Traditional multiple-output electric power scheme is turn-offed unwanted voltage output with metal-oxide-semiconductor usually, and its efficient is poor, and cost is high, and stand-by power consumption is also bigger.
The utility model content
The utility model provides a kind of commutation circuit of portable power source multichannel output voltage to the problems referred to above.
The technical scheme of the utility model is following: a kind of portable power source multichannel output voltage commutation circuit is characterized in that: comprise the power supply IC of main control chip, Adjustable Output Voltage, said power supply IC feedback end connecting resistance bleeder circuit; This resistor voltage divider circuit is connected with main control chip, receives the conversion of main control chip regulating and controlling power supply IC feedback end input resistance and then realization output voltage.
Said resistor voltage divider circuit comprises first, second, third resistance and a triode; Said first, second resistance string is coupled between power supply and the ground, and the two series connection point is connected with power supply IC feedback end, the 3rd resistance one termination power, and the said transistor collector of another termination, this transistor emitter ground connection, base stage connects main control chip through current-limiting resistance.
Said resistor voltage divider circuit also comprises an electric capacity, and said the 3rd resistance one end connects power supply through this electric capacity.
Said main control chip also connects the Enable Pin EN of power supply IC through another transistor control circuit, transistor collector connects the Enable Pin EN of power supply IC in this transistor control circuit, grounded emitter, and base stage connects main control chip through current-limiting resistance.
The utility model circuit structure is simple, only needs two triodes and resistance can realize multichannel output voltage function, more traditional multichannel output voltage scheme; Can save transformer, not only reduce cost, also can reduce the PCB area; Be beneficial to the miniaturization of product, stand-by power consumption is lower simultaneously, energy-conserving and environment-protective.
Figure of description
Accompanying drawing 1 connects sketch map for the utility model main control chip;
Accompanying drawing 2 is that the utility model power supply IC and resistor voltage divider circuit connect sketch map.
Embodiment
In order to let those skilled in the art understand the technical scheme of the utility model better, the utility model is done further to set forth below in conjunction with accompanying drawing.
Like Fig. 1, shown in 2, the portable power source multichannel output voltage commutation circuit that the utility model disclosed comprises main control chip U2, power supply IC U4 and resistor voltage divider circuit.The 1 pin BS end of said power supply IC U4 connects the 9V power supply through inductance coil L4, L5,4 pin ground connection, and 6,8 pin (COMP, SS soft start) also pass through capacity earth, feedback end 5 pin connecting resistance bleeder circuits respectively.This resistor voltage divider circuit is connected with main control chip U2, receives the conversion of main control chip regulating and controlling power supply IC feedback end input resistance and then realization output 3 pin output voltages.
Among this embodiment, resistor voltage divider circuit comprises resistance R 18, R19, R20, capacitor C 34 and triode Q5; Resistance R 18, R19 are series between power supply and the ground; The two series connection point is connected with feedback end 5 pin of power supply IC U4, and resistance R 20 1 ends connect power supply through capacitor C 34, another termination triode Q5 collector electrode; Triode Q5 grounded emitter, base stage connects main control chip U2 through current-limiting resistance R25.
Whether said main control chip U2 also connects EN Enable Pin 7 pin of power supply IC through transistor control circuit, be used to control power supply and export.Triode Q4 collector electrode connects 7 pin of power supply IC in the said transistor control circuit, grounded emitter, and base stage connects main control chip U2 through current-limiting resistance R16.
In the present embodiment, by opening or closing of main control chip U2 control triode Q5, make power supply IC feedback end resistance value that two states arranged, then power supply IC output also can two kinds of magnitudes of voltage of corresponding output.In the practical application, adopt aforesaid way,, can mate the suitable resistance of multichannel, realize the more variation of plurality of voltages of output by main control chip control.
Need to prove; Under the situation that does not deviate from the utility model spirit and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (4)
1. a portable power source multichannel output voltage commutation circuit is characterized in that: comprise the power supply IC of main control chip, Adjustable Output Voltage, said power supply IC feedback end connecting resistance bleeder circuit; This resistor voltage divider circuit is connected with main control chip, receives the conversion of main control chip regulating and controlling power supply IC feedback end input resistance and then realization output voltage.
2. portable power source multichannel output voltage commutation circuit according to claim 1, it is characterized in that: said resistor voltage divider circuit comprises resistance R 18, R19, R20 and triode Q5; Said resistance R 18, R19 are series between power supply and the ground; Resistance R 18, R19 series connection point are connected with power supply IC feedback end, resistance R 20 1 termination powers, another termination triode Q5 collector electrode; Triode Q5 grounded emitter, base stage connects main control chip through current-limiting resistance.
3. portable power source multichannel output voltage commutation circuit according to claim 2 is characterized in that said resistor voltage divider circuit also comprises capacitor C 34, and said resistance R 20 1 ends connect power supply through capacitor C 34.
4. portable power source multichannel output voltage commutation circuit according to claim 3; It is characterized in that: said main control chip also connects the Enable Pin EN of power supply IC through transistor control circuit; Transistor collector connects the Enable Pin EN of power supply IC in the said transistor control circuit; Grounded emitter, base stage connects main control chip through current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201615461U CN202503438U (en) | 2012-04-17 | 2012-04-17 | Switching circuit for multi-path output voltage of mobile power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201615461U CN202503438U (en) | 2012-04-17 | 2012-04-17 | Switching circuit for multi-path output voltage of mobile power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202503438U true CN202503438U (en) | 2012-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201615461U Expired - Fee Related CN202503438U (en) | 2012-04-17 | 2012-04-17 | Switching circuit for multi-path output voltage of mobile power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202503438U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110502092A (en) * | 2019-07-17 | 2019-11-26 | 闻泰科技(无锡)有限公司 | Power supply circuit and electronic equipment |
-
2012
- 2012-04-17 CN CN2012201615461U patent/CN202503438U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110502092A (en) * | 2019-07-17 | 2019-11-26 | 闻泰科技(无锡)有限公司 | Power supply circuit and electronic equipment |
| CN110502092B (en) * | 2019-07-17 | 2023-11-24 | 闻泰科技(无锡)有限公司 | Power supply circuit and electronic equipment |
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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: 20121024 Termination date: 20210417 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |