CN203674964U - Sampling feedback circuit and power supply circuit - Google Patents
Sampling feedback circuit and power supply circuit Download PDFInfo
- Publication number
- CN203674964U CN203674964U CN201420027751.8U CN201420027751U CN203674964U CN 203674964 U CN203674964 U CN 203674964U CN 201420027751 U CN201420027751 U CN 201420027751U CN 203674964 U CN203674964 U CN 203674964U
- Authority
- CN
- China
- Prior art keywords
- circuit
- input
- output
- resistance
- sampling feedback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 56
- 230000003321 amplification Effects 0.000 claims abstract description 25
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 25
- 238000002955 isolation Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Abstract
The utility model is applied to the field of a switch power supply, and provides a sampling feedback circuit and a power supply circuit. The sampling feedback circuit comprises a difference amplification circuit and a voltage follower circuit, wherein the difference amplification circuit is provided with a first input end and a second input end, and performs difference amplification on signals accessed from the first input end and the second input end; and the voltage follower circuit is provided with an output end connected with the output end of the difference amplification circuit, performs impedance isolation on signals outputted by the difference amplification circuit, and outputs signals as the same as the signals outputted by the difference amplification circuit. The sampling feedback circuit employs an amplifier for signal amplification and isolation so that the influence exerted on the sampling feedback circuit by a working temperature can be effectively avoided; and accordingly, the sampling feedback circuit can output stable electric signals at different temperatures.
Description
Technical field
The utility model belongs to field of switch power, relates in particular to a kind of sampling feedback circuit and power circuit.
Background technology
In the product of practical application Switching Power Supply, the output voltage of this product is distributed in a wider scope conventionally, and the output voltage of product conventionally can vary with temperature and change.
At present, in the circuit of powering by Switching Power Supply, all permitted translation circuit in advance the voltage of Switching Power Supply output is changed, further passed through current rectifying and wave filtering circuit, the power supply signal after rectifying and wave-filtering is powered to the load.For the power supply signal after rectifying and wave-filtering is controlled, the power supply signal powering to the load is carried out negative feedback by the normal sampling feedback circuit that uses, and the voltage that controller is exported according to the signal controlling varying circuit of feedback is so that the power supply signal providing to load to be finally provided.
Shown in the sampling feedback circuit diagram 1 using at present; Photoelectrical coupler in Fig. 1 and controllable accurate source of stable pressure TL431, in the time of sampling feedback circuit working, be all subject to the impact of ambient temperature larger, especially photoelectrical coupler; Thereby cause sampling feedback circuit output the signal of telecommunication voltage with temperature one in a big way in variation.Sampling feedback circuit described in Fig. 1 is harsher to the temperature requirement of operational environment, and therefore suitable environment exists limitation.
Utility model content
The purpose of this utility model is to provide a kind of sampling feedback circuit, is subject to the impact of operating ambient temperature large with the sampling feedback circuit that comprises photoelectrical coupler that solves prior art and provide, and causes the problem of larger sampling error.
On the one hand, the utility model provides a kind of sampling feedback circuit, comprising:
There is first input end and the second input, to carry out the differential amplifier circuit of differential amplification from the signal of described first input end and described the second input access;
Have output, the output of differential amplifier circuit described in input termination, carries out the voltage follower circuit of the signal that signal that impedance isolation output exports with described differential amplifier circuit is identical to the signal of described differential amplifier circuit output.
Preferably, described differential amplifier circuit comprises:
The first resistance, the second resistance, the 3rd resistance, the 4th resistance and differential amplification chip;
The first end of described the first resistance is the first input end of described differential amplifier circuit, the first end of described the 3rd resistance is the second input of described differential amplifier circuit, the reversed input pin of described differential amplification chip, positive input pin, power pins, grounding pin and output pin connect respectively the second end of described the first resistance, the second end of described the 3rd resistance, power supply, the second end of ground and described the second resistance, the second end of the first resistance described in the first termination of described the second resistance, the first end of described the 4th resistance and the second end connect respectively the second end and the ground of described the 3rd resistance, the output pin of described differential amplification chip is the output of described differential amplifier circuit.
Preferably, described voltage follower circuit comprises:
Operational amplifier chip;
The reversed input pin of described operational amplifier chip connects output pin, and the positive input pin of described operational amplifier chip and output pin are respectively input and the output of described voltage follower circuit.
On the one hand, the utility model provides a kind of power circuit, comprises Switching Power Supply, controller, translation circuit and current rectifying and wave filtering circuit, also comprises above-mentioned sampling feedback circuit;
Wherein, input, control input end and the output of described translation circuit connects respectively the control output end of described Switching Power Supply, described controller and the input of described current rectifying and wave filtering circuit, the first input end of the differential amplifier circuit that described sampling feedback circuit comprises and the second input connect respectively the first output and second output of described current rectifying and wave filtering circuit, the sampling end of controller described in the output termination of the voltage follower circuit that described sampling feedback circuit comprises.
The beneficial effects of the utility model: sampling feedback circuit adopts amplifier to carry out signal amplification and isolation, the impact that can effectively avoid working temperature to cause sampling feedback circuit; Especially, while being differential signal when the signal from first input end input with from the signal of the second input input, can further avoid the impact of working temperature on sampling feedback circuit; And then sampling feedback circuit can be at the signal of telecommunication of stable output under different temperatures.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of the sampling feedback circuit that provides of background technology;
Fig. 2 is the circuit structure diagram of the sampling feedback circuit that provides of the utility model embodiment;
Fig. 3 is the circuit diagram of the sampling feedback circuit that provides of the utility model embodiment;
Fig. 4 shows the composition structure chart of the power circuit that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
For technical scheme described in the utility model is described, describe below by specific embodiment.
It should be noted that, the sampling feedback circuit 1 that the utility model embodiment provides is applicable to adopt the power circuit of Switching Power Supply.
Wherein, described power circuit comprises:
Switching Power Supply, for providing power supply signal;
Controller, the sampled signal of exporting for receiving sampling feedback circuit 1, and according to the voltage of the signal of telecommunication of this sampled signal control change circuit output;
Translation circuit, for carrying out voltage transitions by new the power supply of Switching Power Supply number; And
Current rectifying and wave filtering circuit, carries out rectification for the signal of telecommunication to translation circuit output, filtering, to load output electrical signals to drive loaded work piece.
Fig. 2 shows the composition structure of the sampling feedback circuit 1 that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
Adopting in the power circuit of Switching Power Supply, also comprise a kind of sampling feedback circuit 1, this kind of sampling feedback circuit 1 comprises:
There is first input end and the second input, to carry out the differential amplifier circuit 11 of differential amplification from the signal of described first input end and described the second input access;
There is output, the output of input differential amplifier circuit 11, the signal that differential amplifier circuit 11 is exported carries out the voltage follower circuit 12 of the signal that signal that impedance isolation output exports with differential amplifier circuit 11 is identical.
It should be noted that, the signal of inputting from first input end and the signal from the second input input can be differential signal.In addition, also can be from the large voltage signal of first input end input, from the second input input small voltage signal; Or, from the large voltage signal of the second input input, from first input end input small voltage signal.In addition, can also first input end input signal and input respectively unlike signal from the second input.Wherein, first input end and the second input are respectively node Vin+ and node Vin-.The output of voltage follower circuit 12 is node Vout.
And then this kind of sampling feedback circuit 1 sampled from the signal of telecommunication of the first output output and the signal of telecommunication of the second output output to current rectifying and wave filtering circuit respectively by first input end and the second input.And then the differential amplifier that differential amplifier circuit 11 comprises carries out differential amplification to the signal of telecommunication of the signal of telecommunication from first input end input and the input of the second input.
Front stage circuits (comprising differential amplifier circuit 11) for fear of sampling feedback circuit 1 impacts load circuit and controller, carries out impedance isolation by voltage follower circuit 12; The signal of exporting from the input input difference amplifying circuit 11 of voltage follower circuit 12, exports the signal of identical voltage magnitude from output to controller.
Like this, the resistance or the amplifier that adopt due to sampling feedback circuit 1 are not the components and parts responsive especially to working temperature, thereby are subject to the impact of working temperature little.Preferably, if when the signal sampling from first input end and the signal sampling from the second input are differential signal, more reduce the impact of working temperature on sampling feedback circuit 1, under different temperatures, the magnitude of voltage of the signal that sampling feedback circuit 1 is exported changes very little (can ignore).
Fig. 3 shows the circuit of the sampling feedback circuit 1 that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
As the utility model one embodiment, differential amplifier circuit 11 comprises:
The first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and differential amplification chip U1;
The first end of described the first resistance R 1 is the first input end of differential amplifier circuit 11, the first end of described the 3rd resistance R 3 is the second input of differential amplifier circuit 11, the reversed input pin VI1-of described differential amplification chip U1, positive input pin VI1+, power pins VCC, grounding pin GND and output pin OUT1 connect respectively the second end of described the first resistance R 1, the second end of described the 3rd resistance R 3, power supply, the second end of ground and described the second resistance R 2, the second end of the first resistance R 1 described in the first termination of described the second resistance R 2, the first end of described the 4th resistance R 4 and the second end connect respectively the second end and the ground of described the 3rd resistance R 3, the output pin OUT1 of described differential amplification chip U1 is the output of differential amplifier circuit 11.
In the present embodiment, differential amplifier circuit 11 adopts differential amplification chip U1 to carry out differential amplification; Wherein, the signal (obtaining from the second output sampling of current rectifying and wave filtering circuit) that the reversed input pin VI1-of differential amplification chip U1 and positive input pin VI1+ access respectively the signal (obtaining from the first output sampling of current rectifying and wave filtering circuit) from first input end input and input from the second input.
Preferably, the magnitude of voltage size of the signal of telecommunication of the output pin OUT1 output of differential amplification chip U1, can change by the resistance of adjusting the second resistance R 2.
As the utility model one embodiment, voltage follower circuit 12 comprises:
Operational amplifier chip U2;
The reversed input pin VI2-of described operational amplifier chip U2 meets output pin OUT2, and the positive input pin VI2+ of described operational amplifier chip U2 and output pin OUT2 are respectively input and the output of voltage follower circuit 12.
Like this, can realize impedance isolation by operational amplifier chip U2; Meanwhile, operational amplifier chip U2, from the signal of telecommunication of output pin OUT2 output, has identical amplitude with the signal of telecommunication of reversed input pin VI2-input, realizes voltage follow.
In the utility model embodiment, the signal of telecommunication of operational amplifier chip U2 output is input to the sampling end of controller, for controller reference; Controller compares according to the signal of telecommunication receiving from sampling end, exports control signal according to comparative result to translation circuit; Translation circuit, according to this control signal, is adjusted the magnitude of voltage that Switching Power Supply is carried out to the signal of telecommunication of exporting after voltage transformation.
Fig. 4 shows the composition structure of the power circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
On the one hand, the utility model provides a kind of power circuit, comprises Switching Power Supply, controller, translation circuit and current rectifying and wave filtering circuit, also comprises above-mentioned sampling feedback circuit 1;
Wherein, input, control input end and the output of described translation circuit connects respectively the control output end of described Switching Power Supply, described controller and the input of described current rectifying and wave filtering circuit, the first input end of the differential amplifier circuit 11 that described sampling feedback circuit 1 comprises and the second input connect respectively the first output and second output of described current rectifying and wave filtering circuit, the sampling end of controller described in the output termination of the voltage follower circuit 12 that described sampling feedback circuit 1 comprises.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; make without departing from the concept of the premise utility some alternative or obvious modification that are equal to; and performance or purposes identical, all should be considered as belonging to the utility model by the definite scope of patent protection of submitted to claims.
Claims (4)
1. a sampling feedback circuit, is characterized in that, comprising:
There is first input end and the second input, to carry out the differential amplifier circuit of differential amplification from the signal of described first input end and described the second input access;
Have output, the output of differential amplifier circuit described in input termination, carries out the voltage follower circuit of the signal that signal that impedance isolation output exports with described differential amplifier circuit is identical to the signal of described differential amplifier circuit output.
2. sampling feedback circuit as claimed in claim 1, is characterized in that, described differential amplifier circuit comprises:
The first resistance, the second resistance, the 3rd resistance, the 4th resistance and differential amplification chip;
The first end of described the first resistance is the first input end of described differential amplifier circuit, the first end of described the 3rd resistance is the second input of described differential amplifier circuit, the reversed input pin of described differential amplification chip, positive input pin, power pins, grounding pin and output pin connect respectively the second end of described the first resistance, the second end of described the 3rd resistance, power supply, the second end of ground and described the second resistance, the second end of the first resistance described in the first termination of described the second resistance, the first end of described the 4th resistance and the second end connect respectively the second end and the ground of described the 3rd resistance, the output pin of described differential amplification chip is the output of described differential amplifier circuit.
3. sampling feedback circuit as claimed in claim 1, is characterized in that, described voltage follower circuit comprises:
Operational amplifier chip;
The reversed input pin of described operational amplifier chip connects output pin, and the positive input pin of described operational amplifier chip and output pin are respectively input and the output of described voltage follower circuit.
4. a power circuit, comprises Switching Power Supply, controller, translation circuit and current rectifying and wave filtering circuit, it is characterized in that, also comprises the arbitrary described sampling feedback circuit of claims 1 to 3;
Wherein, input, control input end and the output of described translation circuit connects respectively the control output end of described Switching Power Supply, described controller and the input of described current rectifying and wave filtering circuit, the first input end of the differential amplifier circuit that described sampling feedback circuit comprises and the second input connect respectively the first output and second output of described current rectifying and wave filtering circuit, the sampling end of controller described in the output termination of the voltage follower circuit that described sampling feedback circuit comprises.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420027751.8U CN203674964U (en) | 2014-01-16 | 2014-01-16 | Sampling feedback circuit and power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420027751.8U CN203674964U (en) | 2014-01-16 | 2014-01-16 | Sampling feedback circuit and power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203674964U true CN203674964U (en) | 2014-06-25 |
Family
ID=50971213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420027751.8U Expired - Fee Related CN203674964U (en) | 2014-01-16 | 2014-01-16 | Sampling feedback circuit and power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203674964U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166034A (en) * | 2014-08-12 | 2014-11-26 | 成都信息工程学院 | High-precision difference sampling circuit |
| CN107565799A (en) * | 2017-09-06 | 2018-01-09 | 广东欧珀移动通信有限公司 | Power-supply device and its power feedback |
| CN108008322A (en) * | 2017-10-27 | 2018-05-08 | 珠海格力节能环保制冷技术研究中心有限公司 | The detection method and circuit of multiple power supplies |
| CN113703368A (en) * | 2021-08-30 | 2021-11-26 | 华能威海发电有限责任公司 | Signal isolating device |
| CN113866662A (en) * | 2021-09-26 | 2021-12-31 | 石家庄通合电子科技股份有限公司 | Switching power supply output current detection circuit and switching power supply |
-
2014
- 2014-01-16 CN CN201420027751.8U patent/CN203674964U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166034A (en) * | 2014-08-12 | 2014-11-26 | 成都信息工程学院 | High-precision difference sampling circuit |
| CN107565799A (en) * | 2017-09-06 | 2018-01-09 | 广东欧珀移动通信有限公司 | Power-supply device and its power feedback |
| CN107565799B (en) * | 2017-09-06 | 2019-08-20 | Oppo广东移动通信有限公司 | Power-supply device and its power feedback |
| CN108008322A (en) * | 2017-10-27 | 2018-05-08 | 珠海格力节能环保制冷技术研究中心有限公司 | The detection method and circuit of multiple power supplies |
| CN113703368A (en) * | 2021-08-30 | 2021-11-26 | 华能威海发电有限责任公司 | Signal isolating device |
| CN113866662A (en) * | 2021-09-26 | 2021-12-31 | 石家庄通合电子科技股份有限公司 | Switching power supply output current detection circuit and switching power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203674964U (en) | Sampling feedback circuit and power supply circuit | |
| CN103178852B (en) | A kind of high-speed sampling front-end circuit | |
| CN105842526B (en) | A kind of zero current detecting circuit and method and voltage conversion circuit | |
| CN101557203B (en) | Power amplifier with overcurrent protection | |
| WO2009091474A8 (en) | Hybrid on-chip regulator for limited output high voltage | |
| CN103760943B (en) | A kind of slew rate enhancing circuit being applied to LDO | |
| CN203465330U (en) | Oscilloscope front-end processing circuit | |
| CN207782663U (en) | A kind of constant pressure and flow mode switching circuit | |
| CN203224544U (en) | Oscilloscope front-end processing module circuit | |
| CN203800802U (en) | Large current detection circuit and power source circuit | |
| CN203457116U (en) | CMFB differential amplification circuit and integrated circuit | |
| CN205960950U (en) | DC DC converter and computer | |
| CN205721468U (en) | A kind of constant-current source circuit | |
| CN204559542U (en) | A kind of current-to-voltage converting circuit with inputting biased and active power filtering | |
| CN105450191A (en) | Dual-line silicon microphone amplifier | |
| CN204086333U (en) | A kind of electronic load | |
| CN202975965U (en) | Direct current voltage converting circuit | |
| CN203057075U (en) | Low-noise amplifier | |
| CN103296985A (en) | Signal amplifying module used for communication device | |
| CN207896706U (en) | Farad capacitor charging circuit and electronic equipment | |
| CN203563016U (en) | Low-power-dissipation amplifier for mobile phones | |
| CN202677228U (en) | Laser temperature control circuit | |
| CN201408993Y (en) | High-current direct-current low-voltage power supply circuit | |
| CN205880721U (en) | Adjustable constant current source circuit | |
| CN104639070B (en) | Integrated circuit and user terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518000 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee after: CHINA GREAT WALL TECHNOLOGY GROUP Co.,Ltd. Address before: 518000 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee before: CHINA GREATWALL COMPUTER SHENZHEN Co.,Ltd. |
|
| 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: 20140625 |