CN203761283U - Output voltage-adjustable power adapter - Google Patents
Output voltage-adjustable power adapter Download PDFInfo
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- CN203761283U CN203761283U CN201320873354.8U CN201320873354U CN203761283U CN 203761283 U CN203761283 U CN 203761283U CN 201320873354 U CN201320873354 U CN 201320873354U CN 203761283 U CN203761283 U CN 203761283U
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Abstract
An output voltage-adjustable power adapter relates to a power adapter and comprises a transformer T1, a PWM control unit, a front end input unit, a rear end output unit, a voltage control unit, and a comparison voltage adjusting unit, wherein the PWM control unit is used for controlling the on-off of the transformer T1; the front end input unit is arranged before the transformer T1 and the PWM control unit; the rear end output unit is arranged behind the transformer T1 and the PWM control unit and is connected with the transformer T1; and the comparison voltage adjusting unit is used for adjusting output voltage of the rear end output unit. The comparison voltage adjusting unit collects the output voltage of the rear end output unit, the voltage control unit sends a reference voltage to the comparison voltage adjusting unit, the comparison voltage adjusting unit compares the output voltage of the rear end output unit with the reference voltage and then sends a voltage adjusting signal to the PWM control unit, and the PWM control unit controls the on-off of the transformer T1 according to the voltage adjusting signal so as to enable the output voltage of the rear end output unit to be close to the reference voltage.
Description
Technical field
The utility model relates to a kind of power supply adaptor, is specifically related to a kind of power supply adaptor of adjustable output voltage.
Background technology
Power supply adaptor is widely used in many electronic products, and the output voltage of existing power supply adaptor is non-adjustable, only has single Voltage-output, and versatility is poor.
Summary of the invention
It is adjustable that the purpose of this utility model is to provide a kind of output voltage, the power supply adaptor that versatility is good.
For achieving the above object, the utility model provides following technical scheme.
The power supply adaptor of adjustable output voltage, comprise transformer T1 and for the PWM control unit of control transformer T1 break-make, and be arranged at transformer T1 and PWM control unit front end, the front end input unit being connected with PWM control unit, with be arranged at transformer T1 and PWM control unit rear end, the rear end output unit being connected with transformer T1, also comprise voltage control unit and for adjusting the comparison pressure regulation unit of the output voltage of rear end output unit, the output voltage that compares collection rear end, pressure regulation unit output unit, voltage control unit sends reference voltage to comparing pressure regulation unit, relatively pressure regulation unit by the output voltage of the rear end output unit of its collection and this reference voltage relatively after to PWM control unit transmission pressure regulation signal, PWM control unit according to the break-make of this pressure regulation signal controlling transformer T1 to allow the output voltage of rear end output unit tend to described reference voltage, relatively pressure regulation unit is provided with for the boost button interrupteur SW 1 of the described reference voltage that raises with for reducing the step-down push-button switch SW2 of described reference voltage, boost button interrupteur SW 1 one end is connected in voltage control unit, other end external power supply, step-down button SW2 switch one end is connected in voltage control unit, other end external power supply, after 1 conducting of boost button interrupteur SW, to voltage control unit, send a high level, voltage control unit is just by a default unit voltage of described reference voltage rising, after step-down push-button switch SW2 conducting, to voltage control unit, send a high level, voltage control unit just reduces a default unit voltage by described reference voltage, relatively pressure regulation unit also comprises optocoupler U1, resistance R 6, resistance R 7, diode D1, capacitor C 3, resistance R 8, resistance R 9, operational amplifier U3, resistance R 10, resistance R 11 and resistance R 12, operational amplifier U3 inverting input is connected with voltage control unit via resistance R 12, normal phase input end is connected with the output of rear end output unit via resistance R 9, the normal phase input end of operational amplifier U3 is via resistance R 10 ground connection, power end of operational amplifier U3 is connected with the output of rear end output unit via resistance R 8, another power end ground connection, the output of operational amplifier U3 is connected with the negative pole of diode D1, after capacitor C 3 and resistance R 11 series connection, be connected across between the in-phase input end of operational amplifier U3 and the output of operational amplifier U3, the positive pole of diode D1 is connected in an input of optocoupler U1, resistance R 7 is connected between the contact of diode D1 and optocoupler U1 and the output of rear end output unit, another input of optocoupler U1 is connected with the output of rear end output unit via resistance R 6.
Wherein, this power supply adaptor also comprises for switching the maximum output voltage switch unit of the maximum voltage of rear end output unit output, transformer T1 comprises two secondary coils, maximum output voltage switch unit comprises relay K 1, the double-point double-throw switch K2 for making two parallel connection of secondary windings of transformer T1 export or connect and export being controlled by relay K 1, diode D2, triode Q6, resistance R 30, maximum output voltage switching push button interrupteur SW 3 and resistance R 31, after maximum output voltage switching push button interrupteur SW 3 and resistance R 31 series connection, be connected between power supply and voltage control unit, triode Q6 base stage is connected with voltage control unit via resistance R 30, grounded emitter, collector electrode is connected in a control end of relay K 1, another control end of relay K 1 connects the output of rear end output unit, diode D2 is connected across between two control ends of relay K 1, the positive pole of diode D2 is connected in the contact of relay K 1 and triode Q6, after 3 conductings of maximum output voltage switching push button interrupteur SW, to voltage control unit, send a high level, voltage control unit makes triode Q6 conduction and cut-off with regard to sending high level/low level to the base stage of triode Q6, two control end conduction and cut-off of relay K 1, double-point double-throw switch K2 is subject to relay K 1 control to make two secondary coils series connection output/outputs in parallel of transformer T1.
Wherein, voltage control unit comprises controller and for giving the controller power supply circuits of described controller power supply, and described controller is that model is the single-chip microcomputer that the single-chip microcomputer of S3F9488 or single-chip microcomputer that model is S3C9488 or model are S3F9484.
Wherein, this power supply adaptor also comprises that output voltage display unit is connected with voltage control unit for showing the output voltage display unit of the output voltage of rear end output unit, and voltage control unit is connected with rear end output unit.
Wherein, front end input unit comprises ac input circuit, EMI filter circuit and current rectifying and wave filtering circuit, ac input circuit, EMI filter circuit, current rectifying and wave filtering circuit and PWM control unit are connected successively, rear end output unit comprises circuit of synchronous rectification, filter circuit and DC output circuit, and transformer T1, circuit of synchronous rectification, filter circuit and DC output circuit are connected successively.
The beneficial effects of the utility model are: by comparison pressure regulation unit and voltage control unit are set, realize the output voltage of power supply adaptor is realized to manual adjustments, make the output voltage of power supply adaptor of the present utility model adjustable, versatility is good.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of comparison pressure regulation unit of the power supply adaptor of adjustable output voltage of the present utility model.
Fig. 2 is the electrical block diagram of maximum output voltage switch unit of the power supply adaptor of adjustable output voltage of the present utility model.
Reference numeral comprises: compare pressure regulation unit 1, maximum output voltage switch unit 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
As shown in Figure 1, the power supply adaptor of adjustable output voltage of the present utility model, comprise transformer T1 and for the PWM control unit of control transformer T1 break-make, and be arranged at transformer T1 and PWM control unit front end, the front end input unit being connected with PWM control unit, with be arranged at transformer T1 and PWM control unit rear end, the rear end output unit being connected with transformer T1, the power supply adaptor of adjustable output voltage of the present utility model also comprises voltage control unit and for adjusting the comparison pressure regulation unit 1 of the output voltage of rear end output unit, relatively pressure regulation unit 1 gathers the output voltage of rear end output unit, voltage control unit sends reference voltage to comparing pressure regulation unit 1, relatively pressure regulation unit 1 by the output voltage of the rear end output unit of its collection and this reference voltage relatively after to PWM control unit transmission pressure regulation signal, PWM control unit according to the break-make of this pressure regulation signal controlling transformer T1 to allow the output voltage of rear end output unit tend to described reference voltage, relatively pressure regulation unit 1 is provided with for the boost button interrupteur SW 1 of the described reference voltage that raises with for reducing the step-down push-button switch SW2 of described reference voltage, boost button interrupteur SW 1 one end is connected in voltage control unit, other end external power supply, step-down button SW2 switch one end is connected in voltage control unit, other end external power supply, after 1 conducting of boost button interrupteur SW, to voltage control unit, send a high level, voltage control unit is just by a default unit voltage of described reference voltage rising, after step-down push-button switch SW2 conducting, to voltage control unit, send a high level, voltage control unit just reduces a default unit voltage by described reference voltage.By comparison pressure regulation unit 1 and voltage control unit are set, realize the manual adjustments that realizes to the output voltage of power supply adaptor, make the output voltage of power supply adaptor of the present utility model adjustable, versatility is good.
As shown in Figure 1, relatively pressure regulation unit 1 comprises optocoupler U1, resistance R 6, resistance R 7, diode D1, capacitor C 3, resistance R 8, resistance R 9, operational amplifier U3, resistance R 10, resistance R 11 and resistance R 12, operational amplifier U3 inverting input is connected with voltage control unit via resistance R 12, normal phase input end is connected with the output of rear end output unit via resistance R 9, the normal phase input end of operational amplifier U3 is via resistance R 10 ground connection, power end of operational amplifier U3 is connected with the output of rear end output unit via resistance R 8, another power end ground connection, the output of operational amplifier U3 is connected with the negative pole of diode D1, after capacitor C 3 and resistance R 11 series connection, be connected across between the in-phase input end of operational amplifier U3 and the output of operational amplifier U3, the positive pole of diode D1 is connected in an input of optocoupler U1, resistance R 7 is connected between the contact of diode D1 and optocoupler U1 and the output of rear end output unit, another input of optocoupler U1 is connected with the output of rear end output unit via resistance R 6.
Relatively the course of work of pressure regulation unit 1 is as follows:
As shown in Figure 1, voltage control unit provides reference voltage to the inverting input of operational amplifier U3, when boost button interrupteur SW 1/, step-down push-button switch SW2 is every is clicked, the 1/ step-down push-button switch SW2 conducting of boost button interrupteur SW, boost button interrupteur SW 1/ step-down push-button switch SW2 just sends a high level to voltage control unit, using this high level as step-up trigger signal/step-down triggering signal, voltage control unit is received this high level default unit voltage that just reference voltage raise/reduces, reference voltage after raising/reducing compares computing with the voltage that is input to the in-phase input end of operational amplifier U3, wherein the voltage of the in-phase input end of operational amplifier U3 is the voltage of being sampled and being divided to from the output voltage of output rear end output unit by resistance R 9, thereby from a high level/low level of its output output, make optocoupler U1 cut-off/conducting after the voltage of the voltage of in-phase input end and reverse input end being compared by operational amplifier U3, optocoupler U1 ends PWM control unit by transformer T1 conducting, the output voltage of rear end output unit raises, optocoupler U1 conducting, optocoupler U1 sends a low level to PWM control unit, PWM control unit just turn-offs transformer T1 after receiving this low level, the output voltage of rear end output unit just can decline, by optocoupler U1, come to PWM control unit feedback signal, thereby allow the break-make of PWM control unit control transformer T1, with allow rear end output unit output voltage trend reference voltage and be stabilized near reference voltage.
Particularly, relatively pressure regulation unit 1 allows near the output voltage stabilization of rear end output unit process reference voltage be:
When the output voltage of rear end output unit is less than reference voltage, be the voltage that the voltage of operational amplifier U3 in-phase input end is less than reverse input end, the output output high level of operational amplifier U3, optocoupler U1 cut-off, transformer T1 conducting, the output voltage of rear end output unit raises, the voltage of operational amplifier U3 in-phase input end also and then raises, meanwhile, the in-phase input end of capacitor C 3 and 11 couples of operational amplifier U3 of resistance R carries out accelerated charging, the voltage of the in-phase input end of operational amplifier U3 is raised, when it is raised to the voltage that is greater than inverting input, the output output low level of operational amplifier U3 makes optocoupler U1 conducting, PWM control unit just turn-offs transformer T1, the output voltage of rear end output unit declines, the voltage of the in-phase input end of operational amplifier U3 also and then declines, when the output voltage of rear end output unit is greater than reference voltage, be the voltage that the voltage of operational amplifier U3 in-phase input end is greater than reverse input end, the output output low level of operational amplifier U3, optocoupler U1 conducting, transformer T1 cut-off, the output voltage of rear end output unit declines, the voltage of operational amplifier U3 in-phase input end also and then declines, meanwhile, the in-phase input end of capacitor C 3 and 11 couples of operational amplifier U3 of resistance R accelerates electric discharge, make the lower voltage of the in-phase input end of operational amplifier U3, when it drops to the voltage that is less than inverting input, the output output high level of operational amplifier U3 makes optocoupler U1 cut-off, PWM control unit is conducting transformer T1 just, the output voltage of rear end output unit raises, the voltage of the in-phase input end of operational amplifier U3 also and then raises.So move in circles, make the output voltage of rear end output unit remain near reference voltage higher-order of oscillation state among a small circle, make output voltage stabilization near reference voltage.
As shown in Figure 2, this power supply adaptor also comprises for switching the maximum output voltage switch unit 2 of the maximum voltage of rear end output unit output, transformer T1 comprises two secondary coils, maximum output voltage switch unit 2 comprises transformer T1, relay K 1, the double-point double-throw switch K2 for making two parallel connection of secondary windings of transformer T1 export or connect and export being controlled by relay K 1, diode D2, triode Q6, resistance R 30, maximum output voltage switching push button interrupteur SW 3 and resistance R 31, after maximum output voltage switching push button interrupteur SW 3 and resistance R 31 series connection, be connected between power supply and voltage control unit, triode Q6 base stage is connected with voltage control unit via resistance R 30, grounded emitter, collector electrode is connected in a control end of relay K 1, another control end of relay K 1 connects the output of rear end output unit, diode D2 is connected across between two control ends of relay K 1, the positive pole of diode D2 is connected in the contact of relay K 1 and triode Q6, after 3 conductings of maximum output voltage switching push button interrupteur SW, to voltage control unit, send a high level, voltage control unit makes triode Q6 conduction and cut-off with regard to sending high level/low level to the base stage of triode Q6, two control end conduction and cut-off of relay K 1, double-point double-throw switch K2 is subject to relay K 1 control to make two secondary coils series connection output/outputs in parallel of transformer T1.
The course of work of maximum output voltage switch unit 2 is:
Voltage control unit is to base stage output high level or the low level of triode Q6, suppose that now voltage control unit is to the base stage output high level of triode Q6, triode Q6 conducting, between two control ends of relay K 1, there is electric current, as shown in Figure 2,1 pin that relay K 1 is controlled double-point double-throw switch K2 connects 3 pin, and 4 pin of double-point double-throw switch K2 connect 6 pin, therefore two secondary coil series connection outputs of transformer T1; At this moment click maximum output voltage switching push button interrupteur SW 3, after 3 conductings of maximum output voltage switching push button interrupteur SW, to voltage control unit, send a high level, voltage control unit will saltus step be low level to the high level of triode Q6 output, triode Q6 cut-off, no current between two control ends of relay K 1, as shown in Figure 2,1 pin that relay K 1 is controlled double-point double-throw switch K2 connects 2 pin, 4 pin of double-point double-throw switch K2 connect 5 pin, therefore two parallel connection of secondary windings outputs of transformer T1.In the present embodiment, the exportable voltage that is 12V to the maximum after two parallel connection of secondary windings of transformer T1, the exportable voltage that is 24V to the maximum after two secondary coil series connection of transformer T1, therefore pass through the connected mode of two secondary coils of switching transformer T1, can realize the maximum voltage of rear end output unit output is switched.
Wherein, voltage control unit comprises controller and for giving the controller power supply circuits of described controller power supply, and described controller is that model is the single-chip microcomputer that the single-chip microcomputer of S3F9488 or single-chip microcomputer that model is S3C9488 or model are S3F9484.This power supply adaptor also comprises that output voltage display unit is connected with voltage control unit for showing the output voltage display unit of the output voltage of rear end output unit, and voltage control unit is connected with rear end output unit.Front end input unit comprises ac input circuit, EMI filter circuit and current rectifying and wave filtering circuit, ac input circuit, EMI filter circuit, current rectifying and wave filtering circuit and PWM control unit are connected successively, rear end output unit comprises circuit of synchronous rectification, filter circuit and DC output circuit, and transformer T1, circuit of synchronous rectification, filter circuit and DC output circuit are connected successively.EMI filter circuit is by the High-frequency Interference filtering in the alternating current of ac input circuit input, current rectifying and wave filtering circuit will carry out via PWM control unit, being transported to transformer T1 again rectifying and wave-filtering from the alternating current of EMI filter circuit input, transformer T1 outputs to the electric energy after pressure regulation in circuit of synchronous rectification and carries out rectification, flows to afterwards DC output circuit output direct current after filter circuit carries out filtering again.
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 (5)
1. the power supply adaptor of adjustable output voltage, comprise transformer T1 and for the PWM control unit of control transformer T1 break-make, and be arranged at transformer T1 and PWM control unit front end, the front end input unit being connected with PWM control unit, with be arranged at transformer T1 and PWM control unit rear end, the rear end output unit being connected with transformer T1, it is characterized in that: also comprise voltage control unit and for adjusting the comparison pressure regulation unit of the output voltage of rear end output unit, the output voltage that compares collection rear end, pressure regulation unit output unit, voltage control unit sends reference voltage to comparing pressure regulation unit, relatively pressure regulation unit by the output voltage of the rear end output unit of its collection and this reference voltage relatively after to PWM control unit transmission pressure regulation signal, PWM control unit according to the break-make of this pressure regulation signal controlling transformer T1 to allow the output voltage of rear end output unit tend to described reference voltage, relatively pressure regulation unit is provided with for the boost button interrupteur SW 1 of the described reference voltage that raises with for reducing the step-down push-button switch SW2 of described reference voltage, boost button interrupteur SW 1 one end is connected in voltage control unit, other end external power supply, step-down button SW2 switch one end is connected in voltage control unit, other end external power supply, after 1 conducting of boost button interrupteur SW, to voltage control unit, send a high level, voltage control unit is just by a default unit voltage of described reference voltage rising, after step-down push-button switch SW2 conducting, to voltage control unit, send a high level, voltage control unit just reduces a default unit voltage by described reference voltage,
Relatively pressure regulation unit also comprises optocoupler U1, resistance R 6, resistance R 7, diode D1, capacitor C 3, resistance R 8, resistance R 9, operational amplifier U3, resistance R 10, resistance R 11 and resistance R 12, operational amplifier U3 inverting input is connected with voltage control unit via resistance R 12, normal phase input end is connected with the output of rear end output unit via resistance R 9, the normal phase input end of operational amplifier U3 is via resistance R 10 ground connection, power end of operational amplifier U3 is connected with the output of rear end output unit via resistance R 8, another power end ground connection, the output of operational amplifier U3 is connected with the negative pole of diode D1, after capacitor C 3 and resistance R 11 series connection, be connected across between the in-phase input end of operational amplifier U3 and the output of operational amplifier U3, the positive pole of diode D1 is connected in an input of optocoupler U1, resistance R 7 is connected between the contact of diode D1 and optocoupler U1 and the output of rear end output unit, another input of optocoupler U1 is connected with the output of rear end output unit via resistance R 6.
2. the power supply adaptor of adjustable output voltage according to claim 1, it is characterized in that: this power supply adaptor also comprises for switching the maximum output voltage switch unit of the maximum voltage of rear end output unit output, transformer T1 comprises two secondary coils, maximum output voltage switch unit comprises relay K 1, the double-point double-throw switch K2 for making two parallel connection of secondary windings of transformer T1 export or connect and export being controlled by relay K 1, diode D2, triode Q6, resistance R 30, maximum output voltage switching push button interrupteur SW 3 and resistance R 31, after maximum output voltage switching push button interrupteur SW 3 and resistance R 31 series connection, be connected between power supply and voltage control unit, triode Q6 base stage is connected with voltage control unit via resistance R 30, grounded emitter, collector electrode is connected in a control end of relay K 1, another control end of relay K 1 connects the output of rear end output unit, diode D2 is connected across between two control ends of relay K 1, the positive pole of diode D2 is connected in the contact of relay K 1 and triode Q6, after 3 conductings of maximum output voltage switching push button interrupteur SW, to voltage control unit, send a high level, voltage control unit makes triode Q6 conduction and cut-off with regard to sending high level/low level to the base stage of triode Q6, two control end conduction and cut-off of relay K 1, double-point double-throw switch K2 is subject to relay K 1 control to make two secondary coils series connection output/outputs in parallel of transformer T1.
3. the power supply adaptor of adjustable output voltage according to claim 1, it is characterized in that: voltage control unit comprises controller and for giving the controller power supply circuits of described controller power supply, described controller is that model is the single-chip microcomputer that the single-chip microcomputer of S3F9488 or single-chip microcomputer that model is S3C9488 or model are S3F9484.
4. the power supply adaptor of adjustable output voltage according to claim 1, it is characterized in that: this power supply adaptor also comprises for showing the output voltage display unit of the output voltage of rear end output unit, output voltage display unit is connected with voltage control unit, and voltage control unit is connected with rear end output unit.
5. the power supply adaptor of adjustable output voltage according to claim 1, it is characterized in that: front end input unit comprises ac input circuit, EMI filter circuit and current rectifying and wave filtering circuit, ac input circuit, EMI filter circuit, current rectifying and wave filtering circuit and PWM control unit are connected successively, rear end output unit comprises circuit of synchronous rectification, filter circuit and DC output circuit, and transformer T1, circuit of synchronous rectification, filter circuit and DC output circuit are connected successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873354.8U CN203761283U (en) | 2013-12-28 | 2013-12-28 | Output voltage-adjustable power adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873354.8U CN203761283U (en) | 2013-12-28 | 2013-12-28 | Output voltage-adjustable power adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203761283U true CN203761283U (en) | 2014-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320873354.8U Expired - Fee Related CN203761283U (en) | 2013-12-28 | 2013-12-28 | Output voltage-adjustable power adapter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203761283U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901386A (en) * | 2015-06-19 | 2015-09-09 | 深圳维普创新科技有限公司 | Fast charging system |
| CN104917271A (en) * | 2015-06-19 | 2015-09-16 | 李�昊 | Adapter |
| CN106132146A (en) * | 2016-08-23 | 2016-11-16 | 重庆大及电子科技有限公司 | A kind of electromagnetic compatibility cabinet |
-
2013
- 2013-12-28 CN CN201320873354.8U patent/CN203761283U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901386A (en) * | 2015-06-19 | 2015-09-09 | 深圳维普创新科技有限公司 | Fast charging system |
| CN104917271A (en) * | 2015-06-19 | 2015-09-16 | 李�昊 | Adapter |
| CN104901386B (en) * | 2015-06-19 | 2018-11-30 | 深圳维普创新科技有限公司 | A kind of quick charging system |
| CN106132146A (en) * | 2016-08-23 | 2016-11-16 | 重庆大及电子科技有限公司 | A kind of electromagnetic compatibility cabinet |
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| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20181228 |