CN203747675U - Output voltage adjustment circuit of power adapter - Google Patents
Output voltage adjustment circuit of power adapter Download PDFInfo
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- CN203747675U CN203747675U CN201320873220.6U CN201320873220U CN203747675U CN 203747675 U CN203747675 U CN 203747675U CN 201320873220 U CN201320873220 U CN 201320873220U CN 203747675 U CN203747675 U CN 203747675U
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Abstract
An output voltage adjustment circuit of a power adapter relates to the technical field of power. The output voltage adjustment circuit comprises a comparison circuit, an adjustable reference voltage supply circuit, a control level circuit and a feedback circuit. When the actual voltage input to the comparison circuit is lower/higher than the reference voltage input to the comparison circuit, the output end of the comparison circuit is at high/low level, the control level circuit causes a feedback pin of a PWM control circuit to be at high/low level, a rear-end circuit of the power adapter works/does not work to raise/lower the actual voltage input to the comparison circuit, and the feedback circuit accelerates charge/discharge on the actual voltage input end of the comparison circuit to enable the actual voltage input to the comparison circuit to be equal to the reference voltage input to the comparison circuit, namely, a DC output circuit outputs voltage at a reference voltage value. The output voltage adjustment circuit of the power adapter can adjust the voltage output by the power adapter in order to adapt to electronic equipment with different voltage requirements.
Description
Technical field
The utility model relates to power technique fields, particularly relates to a kind of output voltage regulation circuit of power supply adaptor.
Background technology
Power supply adaptor is the power supply conversion equipment of small portable electronic device and electronic apparatus, generally shell, power transformer and rectification circuit, consists of, and by its output type, can be divided into and exchange output type and direct current output type; By connected mode, can be divided into Direct Plug-In and Table top type.
The power supply adaptor of prior art, all can only export a kind of voltage, therefore, the electronic equipment of different voltage requirements all needs to be equipped with separately power supply adaptor, yet, the kind of the electronic equipment that user uses is now a lot, there are mobile phone, notebook computer, camera etc., if each electronic equipment is equipped with a power supply adaptor, will cause so the quantity of adapter a lot, easily chaotic during use, also waste resource.
Summary of the invention
The purpose of this utility model is to avoid weak point of the prior art and output voltage regulation circuit that a kind of power supply adaptor is provided, the voltage of adjustable its output of output voltage regulation circuit of this power supply adaptor, to adapt to the electronic equipment of various different voltage requirements.
The purpose of this utility model is achieved through the following technical solutions:
A kind of output voltage regulation circuit of power supply adaptor is provided, for regulating the output voltage of power supply adaptor, power supply adaptor comprises pwm control circuit, be connected to the front-end circuit and the back-end circuit that is connected to the rear end of pwm control circuit of the front end of pwm control circuit, back-end circuit comprises DC output circuit, in the utility model, comprise comparison circuit, adjustable reference voltage provides circuit, for control pwm control circuit feedback pin level control level circuit and for accelerating to raise or reduce the feedback circuit of the virtual voltage of input comparison circuit, the reference voltage input of comparison circuit provides the output of circuit to be connected with adjustable reference voltage, the virtual voltage input of comparison circuit is connected with the output of DC output circuit, the output of comparison circuit is connected with the feedback pin of pwm control circuit by described control level circuit, feedback circuit is connected between the reference voltage input of comparison circuit and the virtual voltage input of comparison circuit,
Comparison circuit obtains virtual voltage from described DC output circuit, comparison circuit provides circuit adjustment to obtain reference voltage from adjustable reference voltage, when input comparison circuit virtual voltage lower than/higher than input comparison circuit reference voltage time, the output of comparison circuit is high level/low level, the feedback pin that control level circuit is controlled pwm control circuit is high level/low level, the virtual voltage of input comparison circuit is raised/reduced to the back-end circuit maintenance work of power supply adaptor/do not work, the virtual voltage input that feedback circuit is comparison circuit simultaneously accelerates to charge and discharge/accelerate electric discharge so that the virtual voltage of input comparison circuit equals to input the reference voltage of comparison circuit, be that DC output circuit is externally exported with reference voltage value.
Wherein, also comprise that display circuit provides circuit to be connected with adjustable reference voltage for showing that in real time adjustable reference voltage provides the display circuit of the reference voltage value that circuit provides.
Wherein, comparison circuit comprises comparator U3-B, resistance R 8, resistance R 9, resistance R 10 and resistance R 12, one end of one end of resistance R 8 and resistance R 9, the output of DC output circuit connects, the other end of resistance R 8 is connected with the power end 8 of comparator U3-B, the virtual voltage input 6 of the other end of resistance R 9 and comparator U3-B, one end of resistance R 10 connects, the other end ground connection of resistance R 10, the reference voltage input 5 of comparator U3-B provides the output of circuit to be connected with adjustable reference voltage, the output 7 of comparator U3-B is connected with the input of control level circuit.
Wherein, adjustable reference voltage provides circuit to comprise voltage stabilizing circuit, control chip U4, resistance R 12 is to R17, capacitor C 4, capacitor C 5 interrupteur SW 1 and interrupteur SW 2, the input of voltage stabilizing circuit is connected with described DC output circuit, one end of resistance R 13, one end of resistance R 14, one end of resistance R 15, one end of resistance R 16, one end of resistance R 17 is all connected with the output of voltage stabilizing circuit, the other end of resistance R 13 is connected with 8 pin of control chip U4, the other end of resistance R 14 is connected with 10 pin of control chip U4, the other end of resistance R 15 is connected with 11 pin of control chip U4, the other end of resistance R 16 is connected with 12 pin of control chip U4 by interrupteur SW 1, the other end of resistance R 17 is connected with 13 pin of control chip U4 by interrupteur SW 2, 32 pin of control chip U4 are connected with the output of voltage stabilizing circuit, 9 pin of control chip U4 are connected with the reference voltage input of comparator circuit by resistance R 12, between 2 pin of control chip U4 and ground, be connected to capacitor C 4, the capacitor C 5 being connected between 3 pin of control chip U4 and ground.
Wherein, voltage stabilizing circuit comprises that resistance R 1 is to resistance R 5, capacitor C 1, capacitor C 2, capacitor C E1, triode Q1 and reference voltage stabilizing source U2, one end of resistance R 1 is connected with described DC output circuit, one end of the other end of resistance R 1 and resistance R 2, the collector electrode of triode Q1 connects, the base stage of the other end of resistance R 2 and triode Q1, the K end of reference voltage stabilizing source U2, one end of capacitor C 1 connects, the other end of capacitor C 1 is connected with one end of resistance R 3, one end of the other end of resistance R 3 and resistance R 4, the R end of reference voltage stabilizing source U2, one end of resistance R 5 connects, the emitter of the other end of resistance R 4 and triode Q1, the positive pole of capacitor C E1, one end of capacitor C 2 connects, the A end of reference voltage stabilizing source U2, the other end of resistance R 5, the negative pole of capacitor C E1, the equal ground connection of the other end of capacitor C 2.
Wherein, control level circuit comprises diode D1, resistance R 6, resistance R 7 and optocoupler U1, the negative pole of diode D1 connects the output of comparison circuit, the negative pole of one end of the anodal connecting resistance R7 of diode D1, the photophore of optocoupler U1, one end of other end connecting resistance R6 of resistance R 7 is, the output of DC output circuit, the positive pole of the photophore of another termination optocoupler U1 of resistance R 6, the feedback pin of a termination pwm control circuit of the light-receiving device of optocoupler U1, the other end ground connection of the light-receiving device of optocoupler U1.
Wherein, feedback circuit comprises capacitor C 3 and the resistance R 11 of series connection.
Wherein, display circuit comprises that DC output voltage display, resistance R 18 are to resistance R 27 and triode Q2 to triode Q4, DC output voltage display is selected one with 17 pin to 23 pin of control chip U4 by resistance R 21 respectively to resistance R 27 and is connected, triode Q2 is all connected with DC output voltage display to the collector electrode of triode Q4, triode Q2 selects one to resistance R 20 with 14 to 16 pin of control chip U4 by resistance R 18 respectively to the base stage of triode Q4 and is connected, and triode Q2 is to the equal ground connection of emitter of triode Q4.
Wherein, the model of control chip U4 is S3F9488 or S3C9488 or S3F9484.
Wherein, the model of reference voltage stabilizing source U2 is TL431, and the model of optocoupler U1 is 817B, and the model of comparator U3-B is AP4310.
The beneficial effects of the utility model: the utility model comprises comparison circuit, adjustable reference voltage provides circuit, for control pwm control circuit feedback pin level control level circuit and for accelerating to raise or reduce the feedback circuit of the virtual voltage of input comparison circuit, comparison circuit obtains virtual voltage from described DC output circuit, comparison circuit provides circuit adjustment to obtain reference voltage from adjustable reference voltage, when input comparison circuit virtual voltage lower than/higher than input comparison circuit reference voltage time, the output of comparison circuit is high level/low level, the feedback pin that control level circuit is controlled pwm control circuit is high level/low level, the virtual voltage of input comparison circuit is raised/reduced to the back-end circuit maintenance work of power supply adaptor/do not work, the virtual voltage input that feedback circuit is comparison circuit simultaneously accelerates to charge and discharge/accelerate electric discharge so that the virtual voltage of input comparison circuit equals to input the reference voltage of comparison circuit, make DC output circuit externally export with reference voltage value, the voltage of adjustable its output, output voltage range is wide and can intelligent continuous control, the electronic equipment that can adapt to various different voltage requirements, and then reduce the consumption of the required power supply adaptor of electronic equipment, circuit structure is fairly simple, operating current is large, during work, internal resistance is little, power output is large, saves energy.
Accompanying drawing explanation
Utilize accompanying drawing to be described further utility model, but the embodiment in accompanying drawing does not form any restriction of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to the following drawings other accompanying drawing.
Fig. 1 is the circuit block diagram of the output voltage regulation circuit of power supply adaptor.
Fig. 2 is the schematic diagram of the output voltage regulation circuit of power supply adaptor.
In figure, include:
1---comparison circuit;
2---adjustable reference voltage provides circuit;
3---control level circuit;
4---feedback circuit;
5---display circuit;
6---front-end circuit;
7---back-end circuit.
Embodiment
With the following Examples the utility model is further described.
The output voltage regulation circuit of a kind of power supply adaptor of the present embodiment, for regulating the output voltage of power supply adaptor, as shown in Figure 1, power supply adaptor comprises pwm control circuit, be connected to the front-end circuit 6 and the back-end circuit 7 that is connected to the rear end of pwm control circuit of the front end of pwm control circuit, the input voltage range of front-end circuit 6 is AC90 to 264V, back-end circuit 7 comprises DC output circuit, in the utility model, comprise comparison circuit 1, adjustable reference voltage provides circuit 2, for control pwm control circuit feedback pin level control level circuit 3 and for accelerating to raise or reduce the feedback circuit 4 of the virtual voltage of input comparison circuit 1, the reference voltage input of comparison circuit 1 provides the output of circuit 2 to be connected with adjustable reference voltage, the virtual voltage input of comparison circuit 1 is connected with the output of DC output circuit, the output of comparison circuit 1 with by described control level circuit 3, be connected with the feedback pin of pwm control circuit, feedback circuit 4 is connected between the reference voltage input of comparison circuit 1 and the virtual voltage input of comparison circuit 1.
The operation principle of the circuit block diagram of Fig. 1 is as follows:
Comparison circuit 1 obtains virtual voltage from described DC output circuit, comparison circuit 1 provides circuit 2 to regulate from adjustable reference voltage and obtains reference voltage, when input comparison circuit 1 virtual voltage lower than/higher than input comparison circuit 1 reference voltage time, the output of comparison circuit 1 is high level/low level, the feedback pin that control level circuit 3 is controlled pwm control circuit is high level/low level, the virtual voltage of input comparison circuit 1 is raised/reduced to back-end circuit 7 maintenance works of power supply adaptor/do not work, simultaneously feedback circuit 4 accelerates to charge and discharge/accelerate to discharge so that input the reference voltage that the virtual voltage of comparison circuit 1 equals to input comparison circuit 1 for the virtual voltage input of comparison circuit 1, be that DC output circuit is externally exported with reference voltage value.
The voltage of adjustable its output of output voltage regulation circuit of the power supply adaptor of the present embodiment, output voltage range is wide and can intelligent continuous control, the electronic equipment that can adapt to various different voltage requirements, and then reduce the consumption of the required power supply adaptor of electronic equipment, circuit structure is fairly simple, and operating current is large, and during work, internal resistance is little, power output is large, saves energy.
Wherein, as shown in Figure 2, also comprise for the display circuit 5 of the reference voltage value that adjustable reference voltage provides circuit 2 and provide (be power supply adaptor adjusted after the magnitude of voltage of output) is provided in real time, display circuit 5 provides circuit 2 to be connected with adjustable reference voltage, and display circuit 5 can show the magnitude of voltage of the expectation power supply adaptor output that user regulates in real time.
Wherein, as shown in Figure 2, comparison circuit 1 comprises comparator U3-B, resistance R 8, resistance R 9, resistance R 10 and resistance R 12, one end of one end of resistance R 8 and resistance R 9, the output of DC output circuit connects, the other end of resistance R 8 is connected with the power end 8 of comparator U3-B, the virtual voltage input 6 of the other end of resistance R 9 and comparator U3-B, one end of resistance R 10 connects, the other end ground connection of resistance R 10, the reference voltage input 5 of comparator U3-B provides the output of circuit 2 to be connected with adjustable reference voltage, the output 7 of comparator U3-B is connected with the input of control level circuit 3.
Wherein, adjustable reference voltage provides circuit 2 to comprise voltage stabilizing circuit, control chip U4, resistance R 12 is to R17, capacitor C 4, capacitor C 5 interrupteur SW 1 and interrupteur SW 2, the input of voltage stabilizing circuit is connected with described DC output circuit, one end of resistance R 13, one end of resistance R 14, one end of resistance R 15, one end of resistance R 16, one end of resistance R 17 is all connected with the output of voltage stabilizing circuit, the other end of resistance R 13 is connected with 8 pin of control chip U4, the other end of resistance R 14 is connected with 10 pin of control chip U4, the other end of resistance R 15 is connected with 11 pin of control chip U4, the other end of resistance R 16 is connected with 12 pin of control chip U4 by interrupteur SW 1, the other end of resistance R 17 is connected with 13 pin of control chip U4 by interrupteur SW 2, 32 pin of control chip U4 are connected with the output of voltage stabilizing circuit, 9 pin of control chip U4 are connected with the reference voltage input of comparator circuit by resistance R 12, between 2 pin of control chip U4 and ground, be connected to capacitor C 4, the capacitor C 5 being connected between 3 pin of control chip U4 and ground.
Wherein, voltage stabilizing circuit comprises that resistance R 1 is to resistance R 5, capacitor C 1, capacitor C 2, capacitor C E1, triode Q1 and reference voltage stabilizing source U2, one end of resistance R 1 is connected with described DC output circuit, one end of the other end of resistance R 1 and resistance R 2, the collector electrode of triode Q1 connects, the base stage of the other end of resistance R 2 and triode Q1, the K end of reference voltage stabilizing source U2 (being KATHODE end), one end of capacitor C 1 connects, the other end of capacitor C 1 is connected with one end of resistance R 3, one end of the other end of resistance R 3 and resistance R 4, the R end of reference voltage stabilizing source U2 (being REF end), one end of resistance R 5 connects, the emitter of the other end of resistance R 4 and triode Q1, the positive pole of capacitor C E1, one end of capacitor C 2 connects, the A end of reference voltage stabilizing source U2 (being ANODE end), the other end of resistance R 5, the negative pole of capacitor C E1, the equal ground connection of the other end of capacitor C 2.
Wherein, control level circuit comprises diode D1, resistance R 6, resistance R 7 and optocoupler U1, the negative pole of diode D1 connects the output of comparison circuit, the negative pole of one end of the anodal connecting resistance R7 of diode D1, the photophore of optocoupler U1, one end of other end connecting resistance R6 of resistance R 7 is, the output of DC output circuit, the positive pole of the photophore of another termination optocoupler U1 of resistance R 6, the feedback pin of a termination pwm control circuit of the light-receiving device of optocoupler U1, the other end ground connection of the light-receiving device of optocoupler U1.
Wherein, feedback circuit 4 comprises capacitor C 3 and the resistance R 11 of series connection.
Wherein, display circuit 5 comprises that DC output voltage display, resistance R 18 are to resistance R 27 and triode Q2 to triode Q4, DC output voltage display is selected one with 17 pin to 23 pin of control chip U4 by resistance R 21 respectively to resistance R 27 and is connected, triode Q2 is all connected with DC output voltage display to the collector electrode of triode Q4, triode Q2 selects one to resistance R 20 with 14 to 16 pin of control chip U4 by resistance R 18 respectively to the base stage of triode Q4 and is connected, and triode Q2 is to the equal ground connection of emitter of triode Q4.
Wherein, the model of control chip U4 is S3F9488 or S3C9488 or S3F9484.
Wherein, the model of reference voltage stabilizing source U2 is TL431, and the model of optocoupler U1 is 817B, and the model of comparator U3-B is AP4310.
The operation principle of the circuit of Fig. 2 is as follows:
Often click interrupteur SW 1 or interrupteur SW 2 and just to 12 pin of control chip U4, provide triggering signal one time, a reference voltage of 9 pin outputs of control chip U4, and 5 pin that offer comparator U3-B are as reference voltage, the virtual voltage of 6 pin of this reference voltage and comparator U3-B compares (the wherein voltage of the virtual voltage of 6 pin of comparator U3-B for being sampled and be divided to from the DC output voltage of power supply adaptor by resistance R 9), thereby the variable level of 7 pin outputs by comparator U3-B makes optocoupler U1 conducting or closes, control again pwm control circuit work, make a normal operating voltage of power supply adaptor output.14 to 23 pin of control chip U4 are exported corresponding level, give the level of the normal driving of DC output voltage display output and trend of work scanning, make DC output voltage display show output services magnitude of voltage at this moment.
Whenever clicking interrupteur SW 1, whole circuit will repeat above-mentioned job step, and power supply adaptor output voltage is by rising 0.1V.
A variable reference voltage of 9 pin outputs of supposing control chip U4 is XV, is below the voltage stabilizing process of output voltage:
1, when the virtual voltage of 6 pin of input comparator U3-B is less than XV, built-in comparison amplifier and the switching tube of 7 pin of comparator U3-B can not move, at this moment the voltage of 7 pin of comparator U3-B is in high level, optocoupler U1 ends work, transformer T1 work is raised the 6 pin voltages of comparator U3-B, the feedback circuit that meanwhile capacitor C 3 and resistance R 11 form carries out accelerated charging to the 6 pin voltages of comparator U3-B, the 6 pin voltages of acceleration comparator U3-B are raised and are maintained the stable of this voltage simultaneously, when the 6 pin voltages of comparator U3-B rise to the 5 pin voltage of comparator U3-B, the low level of the 7 pin outputs of comparator U3-B makes optocoupler U1 conducting, the feedback pin level of pwm control circuit is dragged down, transformer T1 does not work, output level drops, make the 6 pin voltage drops of comparator U3-B, so repeat, make output voltage keep higher-order of oscillation state among a small circle, and then make output voltage stabilization.
2, the virtual voltage when 6 pin of input comparator U3-B is greater than
xduring V, the built-in comparison amplifier action of the 7 pin output amplifying signal of comparator U3-B, drive the action of built-in switch pipe in conducting state, 7 pin of comparator U3-B are low level, optocoupler U1 conducting, the level of the feedback pin of pwm control circuit is dragged down, transformer T1 quits work and makes the 6 pin lower voltages of comparator U3-B, the feedback circuit that meanwhile capacitor C 3 and resistance R 11 form accelerates electric discharge to the 6 pin voltages of comparator U3-B, the voltage that acceleration drags down 6 pin of comparator U3-B maintains the stable of this voltage simultaneously, when the 6 pin voltages of comparator U3-B are pulled down to the voltage lower than 5 pin of comparator U3-B, the high level of the 7 pin outputs of comparator U3-B makes optocoupler U1 cut-off, the voltage of the driving pin of pwm control circuit recovers high level, transformer T1 conducting work, power supply adaptor is exported normal voltage, so repeat.
Whenever clicking interrupteur SW 2, its operation principle with by interrupteur SW 1, be the same, just adapter output voltage is decline 0.1V.
The detection pin that 10 pin of control chip U4 are minimum output voltage, its output voltage is minimum is 12V, this is also after power supply adaptor power-off, to restart the initial value of output voltage again.
The detection pin that 11 pin of comparator U4 are maximum output voltage, its output voltage is up to 24V.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (10)
1. the output voltage regulation circuit of a power supply adaptor, for regulating the output voltage of power supply adaptor, power supply adaptor comprises pwm control circuit, be connected to the front-end circuit and the back-end circuit that is connected to the rear end of pwm control circuit of the front end of pwm control circuit, back-end circuit comprises DC output circuit, it is characterized in that: comprise comparison circuit, adjustable reference voltage provides circuit, for control pwm control circuit feedback pin level control level circuit and for accelerating to raise or reduce the feedback circuit of the virtual voltage of input comparison circuit, the reference voltage input of comparison circuit provides the output of circuit to be connected with adjustable reference voltage, the virtual voltage input of comparison circuit is connected with the output of DC output circuit, the output of comparison circuit is connected with the feedback pin of pwm control circuit by described control level circuit, feedback circuit is connected between the reference voltage input of comparison circuit and the virtual voltage input of comparison circuit,
Comparison circuit obtains virtual voltage from described DC output circuit, comparison circuit provides circuit adjustment to obtain reference voltage from adjustable reference voltage, when input comparison circuit virtual voltage lower than/higher than input comparison circuit reference voltage time, the output of comparison circuit is high level/low level, the feedback pin that control level circuit is controlled pwm control circuit is high level/low level, the virtual voltage of input comparison circuit is raised/reduced to the back-end circuit maintenance work of power supply adaptor/do not work, the virtual voltage input that feedback circuit is comparison circuit simultaneously accelerates to charge and discharge/accelerate electric discharge so that the virtual voltage of input comparison circuit equals to input the reference voltage of comparison circuit, be that DC output circuit is externally exported with reference voltage value.
2. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 1, it is characterized in that: also comprise that display circuit provides circuit to be connected with adjustable reference voltage for showing that in real time adjustable reference voltage provides the display circuit of the reference voltage value that circuit provides.
3. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 1, it is characterized in that: comparison circuit comprises comparator U3-B, resistance R 8, resistance R 9, resistance R 10 and resistance R 12, one end of one end of resistance R 8 and resistance R 9, the output of DC output circuit connects, the other end of resistance R 8 is connected with the power end 8 of comparator U3-B, the virtual voltage input 6 of the other end of resistance R 9 and comparator U3-B, one end of resistance R 10 connects, the other end ground connection of resistance R 10, the reference voltage input 5 of comparator U3-B provides the output of circuit to be connected with adjustable reference voltage, the output 7 of comparator U3-B is connected with the input of control level circuit.
4. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 1, it is characterized in that: adjustable reference voltage provides circuit to comprise voltage stabilizing circuit, control chip U4, resistance R 12 is to R17, capacitor C 4, capacitor C 5 interrupteur SW 1 and interrupteur SW 2, the input of voltage stabilizing circuit is connected with described DC output circuit, one end of resistance R 13, one end of resistance R 14, one end of resistance R 15, one end of resistance R 16, one end of resistance R 17 is all connected with the output of voltage stabilizing circuit, the other end of resistance R 13 is connected with 8 pin of control chip U4, the other end of resistance R 14 is connected with 10 pin of control chip U4, the other end of resistance R 15 is connected with 11 pin of control chip U4, the other end of resistance R 16 is connected with 12 pin of control chip U4 by interrupteur SW 1, the other end of resistance R 17 is connected with 13 pin of control chip U4 by interrupteur SW 2, 32 pin of control chip U4 are connected with the output of voltage stabilizing circuit, 9 pin of control chip U4 are connected with the reference voltage input of comparator circuit by resistance R 12, between 2 pin of control chip U4 and ground, be connected to capacitor C 4, the capacitor C 5 being connected between 3 pin of control chip U4 and ground.
5. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 4, it is characterized in that: voltage stabilizing circuit comprises that resistance R 1 is to resistance R 5, capacitor C 1, capacitor C 2, capacitor C E1, triode Q1 and reference voltage stabilizing source U2, one end of resistance R 1 is connected with described DC output circuit, one end of the other end of resistance R 1 and resistance R 2, the collector electrode of triode Q1 connects, the base stage of the other end of resistance R 2 and triode Q1, the K end of reference voltage stabilizing source U2, one end of capacitor C 1 connects, the other end of capacitor C 1 is connected with one end of resistance R 3, one end of the other end of resistance R 3 and resistance R 4, the R end of reference voltage stabilizing source U2, one end of resistance R 5 connects, the emitter of the other end of resistance R 4 and triode Q1, the positive pole of capacitor C E1, one end of capacitor C 2 connects, the A end of reference voltage stabilizing source U2, the other end of resistance R 5, the negative pole of capacitor C E1, the equal ground connection of the other end of capacitor C 2.
6. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 1, it is characterized in that: control level circuit comprises diode D1, resistance R 6, resistance R 7 and optocoupler U1, the negative pole of diode D1 connects the output of comparison circuit, one end of the anodal connecting resistance R7 of diode D1, the negative pole of the photophore of optocoupler U1, one end of the other end connecting resistance R6 of resistance R 7, the output of DC output circuit, the positive pole of the photophore of another termination optocoupler U1 of resistance R 6, the feedback pin of one termination pwm control circuit of the light-receiving device of optocoupler U1, the other end ground connection of the light-receiving device of optocoupler U1.
7. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 1, is characterized in that: feedback circuit comprises capacitor C 3 and the resistance R 11 of series connection.
8. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 2, it is characterized in that: display circuit comprises DC output voltage display, resistance R 18 is to resistance R 27 and triode Q2 to triode Q4, DC output voltage display is selected one with 17 pin to 23 pin of control chip U4 by resistance R 21 respectively to resistance R 27 and is connected, triode Q2 is all connected with DC output voltage display to the collector electrode of triode Q4, triode Q2 selects one to resistance R 20 with 14 to 16 pin of control chip U4 by resistance R 18 respectively to the base stage of triode Q4 and is connected, triode Q2 is to the equal ground connection of emitter of triode Q4.
9. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 4, is characterized in that: the model of control chip U4 is S3F9488 or S3C9488 or S3F9484.
10. the output voltage regulation circuit of a kind of power supply adaptor as claimed in claim 5, is characterized in that: the model of reference voltage stabilizing source U2 is TL431, and the model of optocoupler U1 is 817B, and the model of comparator U3-B is AP4310.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873220.6U CN203747675U (en) | 2013-12-28 | 2013-12-28 | Output voltage adjustment circuit of power adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873220.6U CN203747675U (en) | 2013-12-28 | 2013-12-28 | Output voltage adjustment circuit of power adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747675U true CN203747675U (en) | 2014-07-30 |
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ID=51347428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320873220.6U Expired - Fee Related CN203747675U (en) | 2013-12-28 | 2013-12-28 | Output voltage adjustment circuit of power adapter |
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| Country | Link |
|---|---|
| CN (1) | CN203747675U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276406A (en) * | 2017-07-14 | 2017-10-20 | 惠州拓邦电气技术有限公司 | A kind of overvoltage regulating circuit |
| CN110266206A (en) * | 2019-06-25 | 2019-09-20 | 杨大鸣 | A kind of synchronizing voltage-current adapter |
-
2013
- 2013-12-28 CN CN201320873220.6U patent/CN203747675U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276406A (en) * | 2017-07-14 | 2017-10-20 | 惠州拓邦电气技术有限公司 | A kind of overvoltage regulating circuit |
| CN110266206A (en) * | 2019-06-25 | 2019-09-20 | 杨大鸣 | A kind of synchronizing voltage-current adapter |
| CN110266206B (en) * | 2019-06-25 | 2024-03-19 | 杨大鸣 | Synchronous voltage-current adapter |
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Granted publication date: 20140730 Termination date: 20181228 |