CN205427681U - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN205427681U CN205427681U CN201620107863.3U CN201620107863U CN205427681U CN 205427681 U CN205427681 U CN 205427681U CN 201620107863 U CN201620107863 U CN 201620107863U CN 205427681 U CN205427681 U CN 205427681U
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- power supply
- supply chip
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Abstract
The utility model discloses a power supply circuit, which comprises a power supply chip and a voltage adjusting circuit; the power supply chip comprises a voltage input end, a voltage output end and a feedback end; the voltage output end of the power supply chip is connected with the input end of the voltage adjusting circuit, and the output end of the voltage adjusting circuit is connected with the feedback end of the power supply chip. Adopt the embodiment of the utility model provides a, can carry out nimble adjustment to output voltage.
Description
Technical field
This utility model relates to electronic technology field, particularly relates to a kind of power circuit.
Background technology
Power supply chip U1 in power circuit is respectively provided with input Vin, output end vo ut, earth terminal GND and feedback end FB, as shown in Figure 1.Wherein, the relation between the voltage VFB and output voltage Vout of feedback end isAnd in a concrete power circuit, feedback resistance Rfb and divider resistance Rx is fixed value, the voltage causing power circuit to export is fixed value, it is impossible to meet different demand.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of power circuit, it is possible to output voltage is adjusted flexibly.
For solving above technical problem, this utility model embodiment provides a kind of power circuit, including power supply chip and voltage-regulating circuit；Described power supply chip includes voltage input end, voltage output end and feedback end；
The voltage output end of described power supply chip is connected with the input of described voltage-regulating circuit, and the outfan of described voltage-regulating circuit is connected with the feedback end of described power supply chip.
Further, described voltage-regulating circuit includes processor, MUX, feedback resistance and n divider resistance；Described processor includes power end and m outfan, and described MUX includes outfan, m control end and n input；Wherein, the resistance of described n divider resistance is different, n >=1, m >=1；
One end of described feedback resistance and the voltage output end of described power supply chip connect, and the other end of described feedback resistance and the feedback end of described power supply chip connect；One end of described n divider resistance connects the feedback end of described power supply chip respectively, and the other end of described n divider resistance connects n input of described MUX, the output head grounding of described MUX correspondingly；M outfan of described processor connects m control end of described MUX correspondingly.
Being preferably carried out in mode at one, described power supply chip also includes Enable Pin.
In another is preferably carried out mode, described power circuit also includes power supply chip input voltage control circuit；Described processor also includes control signal outfan；
The input of described power supply chip input voltage control circuit connects power supply, the end that controls of described power supply chip input voltage control circuit is connected with the control signal outfan of described processor, and the outfan of described power supply chip input voltage control circuit is connected with the voltage input end of described power supply chip.
Further, described power supply chip input voltage control circuit includes field effect transistor, audion, electric capacity, the first resistance, the second resistance and the 3rd resistance；
One end of described second resistance and the control signal outfan of described processor connect, and the other end of described second resistance and the base stage of described audion connect, the grounded emitter of described audion；One end of described 3rd resistance and the base stage of described audion connect, the other end ground connection of described 3rd resistance；One end of described first resistance and the colelctor electrode of described audion connect, and the other end of described first resistance connects power supply, described electric capacity and described first resistor coupled in parallel；The grid of described field effect transistor and the colelctor electrode of described audion connect, and the source electrode of described field effect transistor and described power supply connect, and the drain electrode of described field effect transistor and the voltage input end of described power supply chip connect.
Preferably, described processor is CPU.
Preferably, described processor is MCU.
The power circuit that this utility model embodiment provides, it is possible to by the voltage-regulating circuit connected between the voltage output end and feedback end of power supply chip, it is achieved output voltage is adjusted flexibly, to meet different power supply requirements.
Accompanying drawing explanation
Fig. 1 is the structural representation of power circuit of the prior art；
Fig. 2 is the structural representation of an embodiment of the power circuit that this utility model provides；
Fig. 3 is the structural representation of another embodiment of the power circuit that this utility model provides；
Fig. 4 is the structural representation of an embodiment of touch key-press circuit；
Fig. 5 is the structural representation of an embodiment of voltage control circuit in the power circuit that this utility model provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described.
See Fig. 2, be the structural representation of an embodiment of the power circuit that this utility model provides.
The present embodiment provides a kind of power circuit, including power supply chip U1 and voltage-regulating circuit 1；Described power supply chip U1 includes voltage input end Vin, voltage output end Vout and feedback end FB；
The voltage output end Vout of described power supply chip U1 is connected with the input of described voltage-regulating circuit 1, and the outfan of described voltage-regulating circuit 1 is connected with the feedback end FB of described power supply chip U1.
It should be noted that the voltage input end Vin input voltage of power supply chip U1, and by voltage output end Vout output voltage.The voltage that power supply chip U1 is exported by voltage-regulating circuit 1 is sampled, and judges whether to need to be adjusted this voltage.If desired, then the voltage of sampling is adjusted, and feed back to inside power supply chip U1 by adjusting voltage by the feedback end FB of power supply chip U1, the internal change in voltage situation according to feedback end FB adjusts voltage output end Vout, voltage output end Vout is made according to adjusting voltage, its voltage exported to be adjusted, thus realize output voltage being adjusted flexibly, to meet different electrical power demand.
Further, as it is shown on figure 3, described voltage-regulating circuit 1 includes processor U2, MUX U3, feedback resistance Rfb and n divider resistance R1, R2 ..., Rn；Described processor U2 includes power end VCC and m outfan IO1, IO2 ..., IOm, and described MUX includes that outfan X, m controls end A1, A2 ..., Am and n input Y1, Y2 ..., Yn；Wherein, described n divider resistance R1, R2 ..., Rn resistance different, n >=1, m >=1.
One end of described feedback resistance Rfb and the voltage output end Vout of described power supply chip U1 connect, and the other end of described feedback resistance Rfb and the feedback end FB of described power supply chip U1 connect；Described n divider resistance R1, R2 ..., one end of Rn connect the feedback end FB of described power supply chip U1 respectively, described n divider resistance R1, R2 ..., the other end of Rn connect n input Y1, Y2 ..., Yn of described MUX U3, the outfan X ground connection of described MUX U3 correspondingly；M outfan IO1, IO2 ..., the IOm of described processor U2 connects m control end A1, A2 ..., Am of described MUX U3 correspondingly.
Wherein, for MUX U3,2m=n, i.e. selects one that controls in n input Y1, Y2 ..., Yn to turn on outfan X with m bit.After processor U2 gathers the voltage of power supply chip U1 output, judge that this voltage is the need of adjustment, if desired, then by m outfan IO1, IO2, ..., IOm exports corresponding binary number, m control end A1 of MUX U3, A2, ..., Am receives this binary number, and after this binary number is converted to decimal number, by n input Y1 of MUX U3, Y2, ..., input corresponding with this decimal number in Yn turns on its outfan X, thus the divider resistance conducting being connected with this input, and the resistance that remaining does not turns on is in vacant state, do not work.The divider resistance of work and feedback resistance Rfb can realize the adjustment of the output voltage to power supply chip U1.
Such as, as shown in Figure 4, in touch key-press circuit, when touch key-press TOUCH_PAD is not pressed, the supply voltage that ADC end collects is U1, and when touch key-press TOUCH_PAD is pressed, the supply voltage that ADC end collects is U2, △ U=U1-U2.Processor is provided with a Sensitirity va1ue △ U0If △ U < △ U being detected0, then show the sensitivity decrease of touch key-press TOUCH_PAD, need to improve supply voltage TOUCH_VCC, to improve the sensitivity of touch key-press TOUCH_PAD；If △ U being detected > > △ U0, then show that the sensitivity of touch key-press TOUCH_PAD is too high, need the sensitivity reducing supply voltage TOUCH_VCC to reduce touch key-press TOUCH_PAD.Wherein, when improving supply voltage TOUCH_VCC, the decimal number that the binary number of processor U2 output is changed is 2, then the 2nd of MUX U3 the input Y2 and outfan X is turned on, and the outfan X ground connection of MUX U3, i.e. being equivalent to one end ground connection of divider resistance R2 with the 2nd input Y2, the other end connects the feedback end FB of power supply chip U1, thus realizes the adjustment of the output voltage to power supply chip U1 according to divider resistance R2 and feedback resistance Rfb.Wherein, n divider resistance R1, R2 ..., Rn resistance different, the divider resistance of different resistance can be selected according to demand to access circuit, the voltage different to control power supply chip U1 output.
Being preferably carried out in mode at one, described power supply chip also includes Enable Pin.
It should be noted that power supply chip also has Enable Pin EN, work and the stopping of power supply chip U1 can be controlled by Enable Pin EN.
In another is preferably carried out mode, described power circuit also includes power supply chip input voltage control circuit；Described processor U2 also includes control signal outfan GPIO；
The input of described power supply chip input voltage control circuit is connected with power supply SYS_VCC, the end that controls of described power supply chip input voltage control circuit is connected with the control signal outfan GPIO of described processor U2, and the outfan of described power supply chip input voltage control circuit is connected with the voltage input end Vin of described power supply chip U1.
It should be noted that for the power supply chip without Enable Pin, control work and the stopping of power supply chip by connecting power supply chip input voltage control circuit at the voltage input end of power supply chip.
Further, as shown in Figure 4, described power supply chip input voltage control circuit includes field effect transistor Q1, audion Q2, electric capacity C1, the first resistance R1, the second resistance R2 and the 3rd resistance R3.
One end of described second resistance R2 and the control signal outfan GPIO of described processor U2 connect, and the other end of described second resistance R2 and the base stage of described audion Q2 connect, the grounded emitter of described audion Q2；One end of described 3rd resistance R3 and the base stage of described audion Q2 connect, the other end ground connection of described 3rd resistance R3；One end of described first resistance R1 and the colelctor electrode of described audion Q2 connect, and it is in parallel with described first resistance R1 that the other end of described first resistance R1 connects power supply SYS_VCC, described electric capacity C1；The grid of described field effect transistor Q1 and the colelctor electrode of described audion Q2 connect, and the source electrode of described field effect transistor Q1 and described power supply SYS_VCC connect, and the drain electrode of described field effect transistor Q1 and the voltage input end Vin of described power supply chip U1 connect.
It should be noted that, when controlling power supply chip U1 work, the control signal outfan GPIO of processor U2 exports high level, making audion Q2 saturation conduction, the voltage at the first resistance R1 two ends is SYS_VCC-0.3V, and audion saturation conduction, the pressure drop of collector and emitter is about 0.3V, the voltage at the i.e. first resistance R1 two ends can make field effect transistor Q1 turn on, then power supply chip U1 input voltage VCC1 approximates SYS_VCC, power supply chip U1 and starts working.When controlling power supply chip U1 and quitting work, the control signal outfan GPIO output low level of processor U2 so that audion Q2 ends, the voltage at the first resistance R1 two ends is 0, and field effect transistor Q1 is ended, then power supply chip U1 input voltage VCC1 is 0, power supply chip U1 is not powered, and quits work.
Preferably, described processor is CPU.
Preferably, described processor is MCU.
Below the operation principle of the power circuit that this utility model provides is described in detail.
Processor U2 waits the output voltage detecting whether to need to adjust power supply chip U1, detect need adjust voltage time, close power supply chip U1, the voltage that processor U2 adjusts as required exports corresponding binary number to MUX U3, the binary number received is converted to decimal number by MUX U3, and the input corresponding with this decimal number is turned on outfan, the divider resistance being connected with this input is made to access circuit, processor turns on the power chip U1 again, thus the divider resistance and feedback resistance Rfb according to accessing realizes the adjustment to power supply chip U1 output voltage.
The above is preferred implementation of the present utility model; it should be pointed out that, for those skilled in the art, on the premise of without departing from this utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.
Claims (7)
1. a power circuit, it is characterised in that include power supply chip and voltage-regulating circuit；Described power supply chip includes voltage input end, voltage output end and feedback end；
The voltage output end of described power supply chip is connected with the input of described voltage-regulating circuit, and the outfan of described voltage-regulating circuit is connected with the feedback end of described power supply chip.
2. power circuit as claimed in claim 1, it is characterised in that described voltage-regulating circuit includes processor, MUX, feedback resistance and n divider resistance；Described processor includes power end and m outfan, and described MUX includes outfan, m control end and n input；Wherein, the resistance of described n divider resistance is different, n >=1, m >=1；
One end of described feedback resistance and the voltage output end of described power supply chip connect, and the other end of described feedback resistance and the feedback end of described power supply chip connect；One end of described n divider resistance connects the feedback end of described power supply chip respectively, and the other end of described n divider resistance connects n input of described MUX, the output head grounding of described MUX correspondingly；M outfan of described processor connects m control end of described MUX correspondingly.
3. power circuit as claimed in claim 1 or 2, it is characterised in that described power supply chip also includes Enable Pin.
4. power circuit as claimed in claim 2, it is characterised in that described power circuit also includes power supply chip input voltage control circuit；Described processor also includes control signal outfan；
The input of described power supply chip input voltage control circuit connects power supply, the end that controls of described power supply chip input voltage control circuit is connected with the control signal outfan of described processor, and the outfan of described power supply chip input voltage control circuit is connected with the voltage input end of described power supply chip.
5. power circuit as claimed in claim 4, it is characterised in that described power supply chip input voltage control circuit includes field effect transistor, audion, electric capacity, the first resistance, the second resistance and the 3rd resistance；
One end of described second resistance and the control signal outfan of described processor connect, and the other end of described second resistance and the base stage of described audion connect, the grounded emitter of described audion；One end of described 3rd resistance and the base stage of described audion connect, the other end ground connection of described 3rd resistance；One end of described first resistance and the colelctor electrode of described audion connect, and the other end of described first resistance connects power supply, described electric capacity and described first resistor coupled in parallel；The grid of described field effect transistor and the colelctor electrode of described audion connect, and the source electrode of described field effect transistor and described power supply connect, and the drain electrode of described field effect transistor and the voltage input end of described power supply chip connect.
6. power circuit as claimed in claim 2, it is characterised in that described processor is CPU.
7. power circuit as claimed in claim 2, it is characterised in that described processor is MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620107863.3U CN205427681U (en) | 2016-02-02 | 2016-02-02 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620107863.3U CN205427681U (en) | 2016-02-02 | 2016-02-02 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205427681U true CN205427681U (en) | 2016-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620107863.3U Active CN205427681U (en) | 2016-02-02 | 2016-02-02 | Power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018090903A1 (en) * | 2016-11-17 | 2018-05-24 | 华为技术有限公司 | Online adjustment circuit for voltage of single board power source |
-
2016
- 2016-02-02 CN CN201620107863.3U patent/CN205427681U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018090903A1 (en) * | 2016-11-17 | 2018-05-24 | 华为技术有限公司 | Online adjustment circuit for voltage of single board power source |
| US10642297B2 (en) | 2016-11-17 | 2020-05-05 | Huawei Technologies Co., Ltd. | Online voltage adjustment circuit for board power supply |
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| C14 | Grant of patent or utility model | ||
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