CN206117481U - Negative feedback circuit - Google Patents
Negative feedback circuit Download PDFInfo
- Publication number
- CN206117481U CN206117481U CN201621106564.4U CN201621106564U CN206117481U CN 206117481 U CN206117481 U CN 206117481U CN 201621106564 U CN201621106564 U CN 201621106564U CN 206117481 U CN206117481 U CN 206117481U
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- CN
- China
- Prior art keywords
- operational amplifier
- resistance
- outfan
- amplifier
- feedback circuit
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Abstract
The utility model discloses a negative feedback circuit, including an operational amplifier, the 2nd operational amplifier and PWM controller, the output of second operation amplifier is through the error amplifier non inverting input end EA+ of the 8th ohmic connection to the PWM controller to carry out PWM and transfer wide control. And simultaneously, the output of second operation amplifier is still through the oscillator timing resistance pin RT of the 9th resistance with the PWM controller to carry out the control of frequency modulation. Above -mentioned negative feedback circuit can make output voltage under the situation of excursion broad, the comparatively stable and dead -beat of output voltage.
Description
Technical field
This utility model is related to a kind of negative-feedback circuit, more particularly to a kind of negative feedback electricity being applied in Switching Power Supply
Road.
Background technology
Switching Power Supply has multiple power circuit topology, and the higher circuit topology of conventional efficiency is LLC circuit topologies at present,
Including half-bridge LLC circuit topologies, full-bridge LLC circuit topologies etc..LLC circuit topologies can realize higher conversion efficiency, circuit
Operating frequency can be greatly improved, and then the volume and cost of power supply can be substantially reduced.LLC circuit topologies are to utilize
Realizing the adjustment of output voltage, the gain ranging of its circuit is narrow, especially exists for the method for the operating frequency of adjustment circuit
Under the output condition of small current, the gain ranging which is input to output is narrower, therefore for wide scope is input into and wide range output
Switching Power Supply, LLC circuits by adjust operating frequency can not realize stablizing for output voltage.In order to realize wide range output
Purpose, can pass through to adjust the operating frequency and dutycycle two ways realization of power supply, hereinafter referred to as modulating frequency and width control mode,
But due to LLC circuits, in different operating frequencies, its Controlling model is different, therefore is difficult to realize in whole output voltage
Steady operation in scope and loading range.
The content of the invention
This utility model embodiment technical problem to be solved there are provided it is a kind of output voltage excursion compared with
In the case of width, output voltage is relatively stable and dead-beat negative-feedback circuit.
A kind of negative-feedback circuit provided by the utility model, including the first operational amplifier, the second operational amplifier and
PWM controller, the inverting input of first operational amplifier connect output voltage V-OUT with resistance by the, and described the
The in-phase input end of one operational amplifier by second resistance connect reference voltage V-SET, first operational amplifier it is anti-
Node between phase input and first resistor passes sequentially through 3rd resistor and the first capacitance connection in the first operational amplifier
Outfan, the node between first electric capacity and the outfan of the first operational amplifier are electric in first by the second capacitance connection
Node between resistance and 3rd resistor, the node between the outfan and the first electric capacity of first operational amplifier pass through the 4th
Resistance is connected to the normal phase input end of the second operational amplifier, and the inverting input of second operational amplifier is electric by the 5th
The current sampling signal of resistance connection transformer former limit, the outfan of second operational amplifier are connected to the by the 7th resistance
The inverting input of two operational amplifiers, the node between the 7th resistance and the outfan of the second operational amplifier is by the
Nine resistance are connected with the agitator timing resistor pin of PWM controller, and the outfan of second operational amplifier is also by the
Eight resistance are connected with the error amplifier homophase input pin of PWM controller.
Wherein, the inverting input of the operational amplifier D2 also refers to d. c. voltage signal by the connection of the 6th resistance.
In negative-feedback circuit described in the utility model, the outfan of second operational amplifier is connected by the 8th resistance
Error amplifier in-phase input end EA+ of PWM controller is connected to, and wide control is adjusted to carry out PWM.Meanwhile, second computing
The outfan of amplifier also passes through the agitator timing resistor pin RT of the 9th resistance and PWM controller, to carry out the control of frequency modulation
System.Above-mentioned negative-feedback circuit can cause output voltage in the case of excursion is wider, and output voltage is relatively stable and nothing is shaken
Swing.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, in the premise for not paying creative work
Under, can be with according to these other accompanying drawings of accompanying drawings acquisition；
Fig. 1 is the circuit diagram of the better embodiment of this utility model negative-feedback circuit.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only this utility model a part of embodiment, rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of this utility model protection.
First, before being described to embodiment, it is necessary to which some herein presented terms are explained.Example
Such as：
If occurring using the term such as " first ", " second " describing various elements herein, but these elements should not
Limited by these terms.These terms are only used for distinguishing an element and another element.Therefore, " first " element can also
It is referred to as " second " element without departing from teaching of the present utility model.
In addition, it is to be understood that when an element " connection " is referred to or " coupled " to another element, which can be direct
Ground connection is directly coupled to another element or can also there is intermediary element.On the contrary, work as referring to an element " directly
When connection " or " directly coupling " are to another element, then there is no intermediary element.
The various terms for occurring herein are used only for the purpose for describing specific embodiment and are not intended as to this
The restriction of utility model.Unless context is clearly dictated otherwise, then singulative is intended to also include plural form.
When in this manual using term " including " and/or " including ", these terms specify the feature, whole
The presence of body, step, operation, element and/or part, but be also not excluded for more than one other feature, entirety, step, operation,
The presence of element, part and/or its group and/or additional.
With regard to embodiment：
Refer to Fig. 1, Fig. 1 is the circuit diagram of the better embodiment of this utility model negative-feedback circuit, the negative feedback
The better embodiment of circuit includes operational amplifier D1, D2 and PWM controller D3, the anti-phase input of the operational amplifier D1
End connects output voltage V-OUT by resistance R1, and the in-phase input end of the operational amplifier D1 is by resistance R2 connection references
Voltage V-SET.
Node between the inverting input and resistance R1 of the operational amplifier D1 passes sequentially through resistance R3 and electric capacity C1
The outfan of operational amplifier D1 is connected to, the node between the electric capacity C1 and the outfan of operational amplifier D1 passes through electric capacity
C2 is connected to the node between resistance R1 and R3.
Node between the outfan and electric capacity C1 of the operational amplifier D1 is connected to operational amplifier by resistance R4
The normal phase input end of D2.Current sample of the inverting input of the operational amplifier D2 by resistance R5 connection transformer former limits
Signal IP1, also by resistance R6 connections with reference to d. c. voltage signal VREF.The outfan of the operational amplifier D2 passes through resistance
R7 is connected to the inverting input of operational amplifier D2.Node between the resistance R7 and the outfan of operational amplifier D2 leads to
Cross resistance R9 to be connected with the agitator timing resistor pin RT of PWM controller D3, the outfan of the operational amplifier D2 also leads to
Cross resistance R8 to be connected with error amplifier in-phase input end EA+ of PWM controller D3.In other embodiment, if operation amplifier
Device D2 precision is higher, can also omit resistance R6 and refer to d. c. voltage signal.
In present embodiment, the outfan of the operational amplifier D2 is connected to the mistake of PWM controller D3 by resistance R8
Difference amplifier in-phase input end EA+, adjusts wide control to carry out PWM.Meanwhile, the outfan of the operational amplifier D2 also passes through
The agitator timing resistor pin RT of resistance R9 and PWM controller D3, to carry out the control of frequency modulation.It is described in the utility model negative
Feedback circuit can cause output voltage in the case of excursion is wider, and output voltage is relatively stable and dead-beat.
Embodiment of the present utility model is these are only, the scope of the claims of the present utility model, every profit is not thereby limited
The equivalent structure made with this utility model description and accompanying drawing content or equivalent flow conversion, or directly or indirectly it is used in which
The technical field of his correlation, is included in scope of patent protection of the present utility model in the same manner.
Claims (2)
1. a kind of negative-feedback circuit, it is characterised in that：The negative-feedback circuit includes the first operational amplifier, the second operation amplifier
Device and PWM controller, the inverting input of first operational amplifier connect output voltage V-OUT, institute with resistance by the
The in-phase input end for stating the first operational amplifier connects reference voltage V-SET, first operational amplifier by second resistance
Inverting input and first resistor between node pass sequentially through 3rd resistor and the first capacitance connection in the first operation amplifier
The outfan of device, the node between first electric capacity and the outfan of the first operational amplifier is by the second capacitance connection in the
Node between one resistance and 3rd resistor, the node between the outfan and the first electric capacity of first operational amplifier pass through
4th resistance is connected to the normal phase input end of the second operational amplifier, and the inverting input of second operational amplifier is by the
The current sampling signal of five resistance connection transformer former limits, the outfan of second operational amplifier are connected by the 7th resistance
Node between the inverting input of the second operational amplifier, the 7th resistance and the outfan of the second operational amplifier leads to
Cross the 9th resistance to be connected with the agitator timing resistor pin of PWM controller, the outfan of second operational amplifier also leads to
Cross the 8th resistance to be connected with the error amplifier homophase input pin of PWM controller.
2. negative-feedback circuit as claimed in claim 1, it is characterised in that：The inverting input of the operational amplifier D2 also leads to
Cross the connection of the 6th resistance and refer to d. c. voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621106564.4U CN206117481U (en) | 2016-10-09 | 2016-10-09 | Negative feedback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621106564.4U CN206117481U (en) | 2016-10-09 | 2016-10-09 | Negative feedback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206117481U true CN206117481U (en) | 2017-04-19 |
Family
ID=58528149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621106564.4U Expired - Fee Related CN206117481U (en) | 2016-10-09 | 2016-10-09 | Negative feedback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206117481U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300917A (en) * | 2016-10-09 | 2017-01-04 | 深圳市钜能科技有限公司 | Negative-feedback circuit |
-
2016
- 2016-10-09 CN CN201621106564.4U patent/CN206117481U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300917A (en) * | 2016-10-09 | 2017-01-04 | 深圳市钜能科技有限公司 | Negative-feedback circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190114 Address after: 526400 I-4-01-01 (No. 2 Workshop) of Guangfozhao (Huaiji) Economic Cooperation Zone B, Huaiji County, Zhaoqing City, Guangdong Province Patentee after: Zhaoqing Century Juneng New Energy Technology Co.,Ltd. Address before: 518000 Chaolitong Building 406, Langshan Road, North District of Nanshan Science Park, Shenzhen City, Guangdong Province Patentee before: SHENZHEN KINGPOWER TECHNOLOGY CO.,LTD. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170419 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |