CN207677621U - A kind of reference voltage output device and Switching Power Supply - Google Patents
A kind of reference voltage output device and Switching Power Supply Download PDFInfo
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- CN207677621U CN207677621U CN201721783715.4U CN201721783715U CN207677621U CN 207677621 U CN207677621 U CN 207677621U CN 201721783715 U CN201721783715 U CN 201721783715U CN 207677621 U CN207677621 U CN 207677621U
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Abstract
It includes microcontroller, digital analog converter and isolated amplifier that the utility model, which discloses a kind of reference voltage output device and Switching Power Supply, reference voltage output device,；The input terminal of the voltage output end connection digital analog converter of microcontroller；The input terminal of the output end connection isolated amplifier of digital analog converter；Reference voltage output end of the output end of isolated amplifier as reference voltage output device.The utility model can more easily realize the adjusting to switch power source output voltage, and the digital circuits section and switched power output in reference voltage output device are isolation, it can ensure the safety of switch power source output voltage in this way, reduce interference of the digital circuit to switched power output.
Description
Technical field
The utility model is related to power technique fields.More particularly, to a kind of reference voltage output device and switch electricity
Source.
Background technology
Currently, the backfeed loop of common switch power source output voltage has following several circuits：
The first, primary basic feedback circuit, use a non-isolated armature winding as feedback voltage, to control
PWM controller makes output voltage reach stable state.The advantages of circuit is that circuit structure is simple, and device is few, at low cost；
The disadvantage is that line regulation is very low, the precision of voltage regulation is poor, and can not accomplish that output voltage is adjustable, and it is even more impossible to realize Switching Power Supply
The number of output voltage is adjustable.
Second, secondary photoelectrical coupler voltage-stabiliser tube feedback circuit, with a photoelectrical coupler primary and secondary every
From, then voltage-stabiliser tube is gone here and there on the photodiode of photoelectrical coupler, when output voltage reaches the breakdown voltage of voltage-stabiliser tube,
Voltage-stabiliser tube is connected, and the photodiode of photoelectrical coupler is driven to be connected, and triggering phototriode conducting then controls PWM controls
Device processed, to realize the purpose stabilized the output voltage.The voltage stabilizing value of selected voltage-stabiliser tube is the output voltage of Switching Power Supply.The electricity
The advantages of road is that the regulation of power supply is significantly improved；The disadvantage is that cost increased, the precision of voltage regulation is general, on voltage-stabiliser tube
Potentiometer is sealed in, the fine tuning of switch power source output voltage may be implemented, cannot achieve significantly may be used for switch power source output voltage
It adjusts, the number that also cannot achieve switch power source output voltage is adjustable.
The third, secondary photoelectrical coupler add TL431 feedback circuits, increase accurate voltage stabilizing benchmark in a feedback circuit
Source TL431, increases feedback compensation network, and TL431 provides a reference voltage, divided output voltage by precision resistance
Pressure sampling, connects the reference voltage point of TL431, and when output voltage increases, electric resistance partial pressure reaches the reference voltage point of TL431,
So TL431 is connected, and so that the photodiode of photoelectrical coupler be connected, and triggering phototriode is connected, after controlling PWM controls
Device achievees the purpose that export voltage stabilizing.The advantages of circuit is that line regulation is high, and the precision of voltage regulation is also high, and feedback control loop is steady
Determine, it is adjustable that output voltage may be implemented after sealing in potentiometer in divider resistance；The disadvantage is that circuit is complicated, cost increases, can
Adjust the resolution ratio of voltage not high.
4th kind, secondary photoelectrical coupler add microcontroller and digital analog converter be added in TL431 feedback circuits, to control
System output backfeed loop, to realize that output voltage number is adjustable.The advantages of circuit is that line regulation is high, the precision of voltage regulation
Also high, feedback loop stable, the resolution ratio for exporting adjustable voltage is very high；The disadvantage is that circuit is complicated, cost increases very much, number
Word circuit can form certain interference due to the presence of clock chip in secondary to output.
In the backfeed loop of above-mentioned four kinds common switch power source output voltages, the 4th kind is digital voltage regulation mode, it
Pressure regulation resolution ratio highest, be the developing direction of the following intelligent power.But the 4th kind there are digital circuits in secondary, to output electricity
Pressure can interfere, it is not easy to accomplish that gamut, the voltage output of wide range is adjustable.
Accordingly, it is desirable to provide a kind of output voltage convenient for regulating switch power supply and avoiding digital circuit defeated to Switching Power Supply
Go out the reference voltage output device and Switching Power Supply of voltage disturbance.
Utility model content
The purpose of this utility model is to provide a kind of output voltage convenient for regulating switch power supply and avoid digital circuit
To the reference voltage output device and Switching Power Supply of switch power source output voltage interference.
In order to achieve the above objectives, the utility model uses following technical proposals：
The utility model discloses a kind of reference voltage output device, including microcontroller, digital analog converter and isolated amplifier；
The voltage output end of the microcontroller connects the input terminal of the digital analog converter；
The output end of the digital analog converter connects the input terminal of the isolated amplifier；
Reference voltage output end of the output end of the isolated amplifier as reference voltage output device.
Preferably, which further includes operational amplifier, and the output end of the isolated amplifier connects the operation amplifier
The input terminal of device, the reference voltage output end of the output end of the operational amplifier as reference voltage output device.
Preferably, which further includes divider, the input terminal of the output end connection divider of the digital analog converter, institute
The output end for stating divider connects the input terminal of the isolated amplifier.
Preferably, the divider is slide rheostat.
Preferably, which further includes the host computer being connect by serial ports with the microcontroller.
A kind of Switching Power Supply, including PWM controller, metal-oxide-semiconductor, transformer, rectifier, filtering is also disclosed in the utility model
Device, error amplifier, photoelectrical coupler and said reference voltage output device；
The control terminal of the output end connection metal-oxide-semiconductor of the PWM controller；
The output end of the metal-oxide-semiconductor connects the primary coil of the transformer；
The secondary coil of the transformer connects the input terminal of the rectifier；
The output end of the rectifier connects the output end of the filter；
The output end of the filter is as the voltage output end of Switching Power Supply and the feedback of the connection error amplifier
Voltage input end；
The reference voltage output end of the reference voltage output device connects the reference voltage input of the error amplifier
End；
The output end of the error amplifier connects the input terminal of the photoelectrical coupler；
The output end of the photoelectrical coupler connects the control terminal of the PWM controller.
Preferably, which further includes sampling resistor, and the both ends of the sampling resistor are separately connected the switch electricity
The feedback voltage input terminal of the voltage output end in source and the error amplifier.
The beneficial effects of the utility model are as follows：
Technical solution described in the utility model can more easily realize the adjusting to switch power source output voltage, and base
Digital circuits section and switched power output in quasi- voltage output device are isolation, can ensure that Switching Power Supply is defeated in this way
Go out the safety of voltage, reduces interference of the digital circuit to switched power output.
Description of the drawings
Specific embodiment of the present utility model is described in further detail below in conjunction with the accompanying drawings；
Fig. 1 shows the schematic diagram of the Switching Power Supply comprising reference voltage output device.
Specific implementation mode
In order to illustrate more clearly of the utility model, the utility model is done into one with reference to preferred embodiments and drawings
The explanation of step.Similar component is indicated with identical reference numeral in attached drawing.It will be appreciated by those skilled in the art that below
Specifically described content is illustrative and be not restrictive, and should not limit the scope of protection of the utility model with this.
As shown in Figure 1, the present embodiment provides a kind of reference voltage output device, including microcontroller 101, digital analog converter
102 and isolated amplifier 103；
The input terminal of the voltage output end connection digital analog converter 102 of microcontroller 101；
The input terminal of the output end connection isolated amplifier 103 of digital analog converter 102；
Reference voltage output end of the output end of isolated amplifier 103 as reference voltage output device.
Wherein, microcontroller 101 generates adjustable digital voltage, which passes through 102 turns of digital analog converter
It is changed to adjustable analog voltage (controlling voltage in other words), which is sent to isolation by digital analog converter 102
Amplifier 103, isolated amplifier 103 by the adjustable analog voltage to carrying out isolation amplification, and using obtained voltage as base
Quasi- voltage, the reference voltage is for the reference voltage as the error amplifier 106 in the backfeed loop of Switching Power Supply.
In the specific implementation, due to the amplification factor of common isolated amplifier 103, (usual maximum value only has than relatively limited
8 times), therefore reference voltage output device provided in this embodiment increases level-one operation in the output end of isolated amplifier 103 and puts
Big device 104, using through 104 amplified voltage of operational amplifier as the error amplifier 106 in the backfeed loop of Switching Power Supply
Reference voltage.Reference voltage output device provided in this embodiment further includes operational amplifier 104, isolated amplifier as a result,
The input terminal of 103 output end connection operational amplifier 104, the output end of operational amplifier 104 is exported as reference voltage to be filled
The reference voltage output end set.
In the specific implementation, (it is usually 0- since the input terminal voltage of common isolated amplifier 103 is all very small
250mV), so the adjustable analog voltage of reference voltage output device logarithm mode converter 102 provided in this embodiment output
Make primary partial pressure.Reference voltage output device provided in this embodiment further includes divider 105 as a result, digital analog converter 102
Output end connects the input terminal of divider 105, the input terminal of the output end connection isolated amplifier 103 of divider 105.Into one
It walks, in reference voltage output device provided in this embodiment, divider 105 is slide rheostat.
In the specific implementation, reference voltage output device provided in this embodiment further includes passing through serial ports with microcontroller 101
The host computer 107 of connection, host computer 107 make microcontroller 101 generate adjustable number electricity by serial ports control single chip computer 101
Pressure.
The present embodiment also provides a kind of Switching Power Supply, including PWM controller 108, metal-oxide-semiconductor 109, transformer 110, rectifier
111, filter 112, error amplifier 106, photoelectrical coupler 113 and reference voltage output device provided in this embodiment；
The control terminal of the output end connection metal-oxide-semiconductor 109 of PWM controller 108, the control terminal of MOS pipes 109 in the present embodiment
For 109 gate terminal of metal-oxide-semiconductor；
The primary coil of the output end connection transformer 110 of metal-oxide-semiconductor 109, the control terminal of metal-oxide-semiconductor 109 is in the present embodiment
109 source electrode of metal-oxide-semiconductor or drain electrode end；
The input terminal of the secondary coil connection rectifier 111 of transformer 110；
The output end of the output end connection filter 112 of rectifier 111；
The output end of filter 112 is as the voltage output end of Switching Power Supply and the feedback electricity of connection error amplifier 106
Press input terminal；
The reference voltage input of the reference voltage output end connection error amplifier 106 of reference voltage output device；
The input terminal of the output end connection photoelectrical coupler 113 of error amplifier 106；
The control terminal of the output end connection PWM controller 108 of photoelectrical coupler 113.
Wherein, error amplifier 106 is exported according to reference voltage output device reference voltage and by the defeated of filter 112
The application condition voltage value of an output, the application condition voltage value is calculated in the output voltage for the Switching Power Supply that outlet is read
It is sent to PWM controller 108 by photoelectrical coupler 113, the duty ratio for controlling PWM controller 108, to adjust PWM controls
The control voltage that device 108 processed is exported to the control terminal of metal-oxide-semiconductor 109, so that PWM controller 108 is switched by metal-oxide-semiconductor 109
Break-make controls the primary coil of transformer 110, next, the voltage that the secondary coil of transformer 110 generates passes through rectifier 111
With satisfactory DC voltage is exported after filter 112, the DC voltage on the one hand for load output, be on the other hand used for
It is sent to error amplifier 106 as Voltage Feedback.
In order to avoid the output voltage that digital circuit is placed on the secondary of Switching Power Supply and leads to digital circuit to Switching Power Supply
Influence, digital circuit is placed on the primary of Switching Power Supply, specially digital circuit existed by Switching Power Supply provided in this embodiment
It after isolation processing, is then sent through in secondary backfeed loop, to achieve the purpose that number is adjustable and is isolated with output.
In the specific implementation, Switching Power Supply provided in this embodiment further includes sampling resistor 114, and the two of sampling resistor 114
End is separately connected the feedback voltage input terminal of the voltage output end and error amplifier 106 of Switching Power Supply.
In the description of the present invention, it should be noted that the orientation or positional relationship of the instructions such as term "upper", "lower"
To be based on the orientation or positional relationship shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, without referring to
Show or imply that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore cannot manage
Solution is limitations of the present invention.Unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " should be done
It broadly understood, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；Can be mechanical connection,
It can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary inside two elements
Connection.For the ordinary skill in the art, above-mentioned term can be understood as the case may be in the present invention
Concrete meaning.
It should be noted that relational terms such as first and second and the like are only in the description of the present invention,
Only it is used for distinguishing one entity or operation from another entity or operation, without necessarily requiring or implying these realities
There are any actual relationship or orders between body or operation.Moreover, the terms "include", "comprise" or its it is any its
He is intended to non-exclusive inclusion by variant, so that the process, method, article or equipment including a series of elements is not
Only include those elements, but also include other elements that are not explicitly listed, or further include for this process, method,
Article or the intrinsic element of equipment.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in the process, method, article or apparatus that includes the element.
Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to the embodiment of the utility model, for those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all
It is the guarantor for belonging to obvious changes or variations that the technical solution of the utility model is extended out still in the utility model
Protect the row of range.
Claims (7)
1. a kind of reference voltage output device, which is characterized in that including microcontroller, digital analog converter and isolated amplifier；
The voltage output end of the microcontroller connects the input terminal of the digital analog converter；
The output end of the digital analog converter connects the input terminal of the isolated amplifier；
Reference voltage output end of the output end of the isolated amplifier as reference voltage output device.
2. reference voltage output device according to claim 1, which is characterized in that the device further includes operational amplifier,
The output end of the isolated amplifier connects the input terminal of the operational amplifier, and the output end of the operational amplifier is as base
The reference voltage output end of quasi- voltage output device.
3. reference voltage output device according to claim 1, which is characterized in that the device further includes divider, described
The input terminal of the output end connection divider of digital analog converter, the output end of the divider connect the defeated of the isolated amplifier
Enter end.
4. reference voltage output device according to claim 3, which is characterized in that the divider is slide rheostat.
5. reference voltage output device according to claim 1, which is characterized in that the device further includes and the microcontroller
The host computer connected by serial ports.
6. a kind of Switching Power Supply, which is characterized in that put including PWM controller, metal-oxide-semiconductor, transformer, rectifier, filter, error
Big device, photoelectrical coupler and the reference voltage output device as described in any one of claim 1-5；
The control terminal of the output end connection metal-oxide-semiconductor of the PWM controller；
The output end of the metal-oxide-semiconductor connects the primary coil of the transformer；
The secondary coil of the transformer connects the input terminal of the rectifier；
The output end of the rectifier connects the output end of the filter；
The output end of the filter is as the voltage output end of Switching Power Supply and the feedback voltage of the connection error amplifier
Input terminal；
The reference voltage output end of the reference voltage output device connects the reference voltage input of the error amplifier；
The output end of the error amplifier connects the input terminal of the photoelectrical coupler；
The output end of the photoelectrical coupler connects the control terminal of the PWM controller.
7. the Switching Power Supply described in claim 6, which is characterized in that the Switching Power Supply further includes sampling resistor, the sampling electricity
The both ends of resistance are separately connected the voltage output end of the Switching Power Supply and the feedback voltage input terminal of the error amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721783715.4U CN207677621U (en) | 2017-12-19 | 2017-12-19 | A kind of reference voltage output device and Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721783715.4U CN207677621U (en) | 2017-12-19 | 2017-12-19 | A kind of reference voltage output device and Switching Power Supply |
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| Publication Number | Publication Date |
|---|---|
| CN207677621U true CN207677621U (en) | 2018-07-31 |
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| CN201721783715.4U Active CN207677621U (en) | 2017-12-19 | 2017-12-19 | A kind of reference voltage output device and Switching Power Supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911007A (en) * | 2017-12-19 | 2018-04-13 | 苏州华兴源创电子科技有限公司 | A kind of reference voltage output device and Switching Power Supply |
| CN113625814A (en) * | 2021-08-13 | 2021-11-09 | 深圳时代能创能源科技有限公司 | Voltage regulating circuit for switching power supply |
-
2017
- 2017-12-19 CN CN201721783715.4U patent/CN207677621U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911007A (en) * | 2017-12-19 | 2018-04-13 | 苏州华兴源创电子科技有限公司 | A kind of reference voltage output device and Switching Power Supply |
| CN113625814A (en) * | 2021-08-13 | 2021-11-09 | 深圳时代能创能源科技有限公司 | Voltage regulating circuit for switching power supply |
| CN113625814B (en) * | 2021-08-13 | 2022-05-17 | 深圳时代能创能源科技有限公司 | Voltage regulating circuit for switching power supply |
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Address after: 215000 Qingqiu Lane 8, Suzhou Industrial Park, Suzhou City, Jiangsu Province Patentee after: Suzhou Huaxing source Polytron Technologies Inc Address before: 215000 East Fang Industrial Park Building, No. 1 Huayun Road, Suzhou Park, Jiangsu Province Patentee before: Suzhou HYC Electronic Technology Co., Ltd. |