CN207053394U - A kind of overvoltage regulating circuit and pfc circuit - Google Patents
A kind of overvoltage regulating circuit and pfc circuit Download PDFInfo
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- CN207053394U CN207053394U CN201720854412.0U CN201720854412U CN207053394U CN 207053394 U CN207053394 U CN 207053394U CN 201720854412 U CN201720854412 U CN 201720854412U CN 207053394 U CN207053394 U CN 207053394U
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Abstract
The utility model is applied to electronic circuit field, there is provided a kind of overvoltage regulating circuit and pfc circuit.The overvoltage regulating circuit is applied to pfc circuit, the PFC voltage detecting circuits of output voltage of the pfc circuit including PFC control chips, for detecting pfc circuit, and reference voltage module；Overvoltage regulating circuit includes：Comparison module, adjustment module and gain setting resistance；PFC voltage detecting circuits are connected with the input of comparison module respectively with reference voltage module, and the output end of comparison module is connected with adjustment module, and adjustment module sets resistance and set mouth to be connected with the gain of PFC control chips with gain setting resistance coupling, gain；The signal that adjustment module exports according to comparison module, the resistance of control gain setting resistor access.Overvoltage regulating circuit provided by the utility model, the output voltage of pfc circuit is adjusted while efficient and sensible can be realized, it is too high or too low to prevent the output voltage of pfc circuit, steady operation when enabling PFC band Larger Dynamic loads.
Description
Technical field
The utility model belongs to electronic circuit field, more particularly to a kind of overvoltage regulation of prevention PFC output voltages overvoltage
Circuit and pfc circuit.
Background technology
In the application of switching output loading at a high speed is needed, pfc circuit generally requires band Larger Dynamic loaded work piece, therefore
Pfc circuit output voltage is easily over-pressed.
At present, when PFC loads become small suddenly, pfc circuit output voltage will raise, when reaching pressure point, PFC controls
IC may turn off PWM outputs so that the output voltage of pfc circuit no longer raises；If now PFC loads are quick to become big, PFC controls
Because the response time is longer, pfc circuit output voltage can not be lifted IC in time, and pfc circuit output voltage will due to quick reduce
Preset value can be less than, it is excessive that this results in pfc circuit output voltage fluctuating range, easily causes circuit reset to be restarted.
Utility model content
The utility model embodiment provides a kind of overvoltage regulating circuit and pfc circuit, it is intended to solves existing pfc circuit
The over-pressed regulation mechanism response time is longer to cause PFC load circuit output voltage fluctuating ranges larger, and then easily causes circuit and answer
The problem of position is restarted.
The utility model embodiment is achieved in that a kind of overvoltage regulating circuit, applied to pfc circuit, the PFC electricity
The PFC voltage detecting circuits of output voltage of the road including PFC control chips, for detecting pfc circuit, and reference voltage module；
Characterized in that, the overvoltage regulating circuit includes：Comparison module, adjustment module and gain setting resistance；
The PFC voltage detecting circuits are connected with input of the reference voltage module respectively with the comparison module, described
The output end of comparison module is connected with the adjustment module, and the adjustment module is set with gain setting resistance coupling, the gain
Determine resistance sets mouth to be connected with the gain of PFC control chips；
The signal that the adjustment module exports according to the comparison module, control the resistance of the gain setting resistor access
Value.
Preferably, the comparison module is single-chip microcomputer or comparator.
Preferably, the comparison module is comparator, is also set between the output end of the comparator and the adjustment module
There is delay circuit, the delay circuit makes the extended durations of action of the significant level of the comparator output.
Preferably, the delay circuit includes：The diode that the output end of one end and the comparator couples, and coupling
Charging module between the diode other end and the adjustment module.
Preferably, the adjustment module includes switching device, the control terminal of the switching device and the comparison module
Output end couples, and the input of the switching device, output end couple with the gain setting resistor, by controlling the derailing switch
The state of part adjusts the resistance that gain setting resistor accesses the gain and sets mouth.
Preferably, the reference voltage module is the reference voltage output end of the PFC control chips, or independent for one
The circuit of setting.
The utility model also provides a kind of pfc circuit, it is characterised in that the pfc circuit includes：PFC control chips,
PFC voltage detecting circuits, reference voltage module for the output voltage that detects pfc circuit, and overvoltage regulating circuit, the mistake
Voltage regulator circuit is as described above described in any one.
Overvoltage regulating circuit provided by the utility model, applied to pfc circuit, including comparison module, adjustment module and increasing
Benefit setting resistance；The signal that adjustment module exports according to comparison module, the resistance of control gain setting resistor access, that is, pass through tune
Section gain adjusts the output voltage of pfc circuit with realizing efficient and sensible, effectively prevent pfc circuit output voltage is too high or mistake
It is low, steady operation when enabling PFC with Larger Dynamic load, it is longer to solve the existing pfc circuit overvoltage regulation mechanism response time
Cause PFC load circuit output voltage fluctuating ranges larger, and then easily cause the problem of circuit reset is restarted, and circuit structure letter
It is single, realize cost control.
Brief description of the drawings
Fig. 1 is a kind of module map of overvoltage regulating circuit provided by the utility model；
Fig. 2 is a kind of overvoltage regulating circuit application state schematic diagram that the utility model embodiment one provides；
Fig. 3 is a kind of pfc circuit that the utility model embodiment two provides；
Fig. 4 is a kind of main loop circuit figure for pfc circuit that the utility model embodiment two provides；
Fig. 5 is a kind of pfc circuit provided by the utility model；
Fig. 6 is a kind of pfc circuit provided by the utility model；
Fig. 7 is a kind of pfc circuit provided by the utility model；
Fig. 8 is a kind of pfc circuit provided by the utility model.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
The term used in the utility model embodiment is only merely for the purpose of description specific embodiment, and is not intended to
Limit the utility model." one kind " of singulative used in the utility model embodiment and appended claims,
" described " and "the" are also intended to including most forms, unless context clearly shows that other implications.It is also understood that herein
The term "and/or" used refers to and any or all may be combined comprising the associated list items purpose of one or more.
It will be appreciated that though it may be described in the utility model embodiment using term first, second, third, etc. each
Kind information, but these information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.Take
Certainly in linguistic context, word as used in this " if " can be construed to " ... when " or " when ... " or " response
In it is determined that ".Moreover, term " comprising ", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that
Process, method, article or the equipment of a series of elements, which must be included, not only includes those key elements, but also including not arranging clearly
The other element gone out, or also include for this process, method, article or the intrinsic key element of equipment.
Overvoltage regulating circuit provided by the utility model, applied to pfc circuit, including comparison module, adjustment module and increasing
Benefit setting resistance；The signal that adjustment module exports according to comparison module, the resistance of control gain setting resistor access, that is, pass through tune
Section gain adjusts the output voltage of pfc circuit with realizing efficient and sensible, effectively prevent pfc circuit output voltage is too high or mistake
It is low, steady operation when enabling PFC with Larger Dynamic load, it is longer to solve the existing pfc circuit overvoltage regulation mechanism response time
Cause PFC load circuit output voltage fluctuating ranges larger, and then easily cause the problem of circuit reset is restarted, and circuit structure letter
It is single, realize cost control.
Fig. 1 is a kind of module map of overvoltage regulating circuit provided by the utility model, and Fig. 2 carries for the utility model embodiment
A kind of overvoltage regulating circuit application state schematic diagram supplied.In the utility model embodiment：
A kind of overvoltage regulating circuit 11, applied to pfc circuit, the pfc circuit includes PFC control chips, for detecting
The PFC voltage detecting circuits of the output voltage of pfc circuit, and reference voltage module；Characterized in that, the overvoltage regulating circuit
Including：Comparison module 12, adjustment module 13 and gain setting resistance 14；
The PFC voltage detecting circuits are connected with input of the reference voltage module respectively with the comparison module 12, institute
The output end for stating comparison module 12 is connected with the adjustment module 13, and the adjustment module 13 couples with gain setting resistance 14,
The gain setting resistance 14 sets mouth to be connected with the gain of PFC Master control chips；
The signal that the adjustment module 13 exports according to the comparison module 12, the gain setting resistance 14 is controlled to access
Resistance.
In the utility model embodiment, the input connection PFC voltage detecting circuits and reference voltage of comparison module 12
Module, output end connection adjustment module 13；Comparison module 12 can be comparator or single-chip microcomputer, for being examined by PFC voltages
The comparative result of the magnitude of voltage of slowdown monitoring circuit output and the magnitude of voltage of reference voltage module output, exports corresponding voltage signal, with
Module 13 is controlled to adjust, and then the resistance for controlling gain setting resistance 14 to access.
In the utility model embodiment, adjustment module 13 includes switching device, the control terminal of the switching device mould compared with
Block 12 connects, and input, output end and gain setting resistance 14 couple, and are increased by the conducting and disconnection of controlling switch device to set
Benefit sets resistance 14 to access the resistance that the gain of PFC Master control chips sets mouth.In the utility model embodiment, switching device can
For triode, metal-oxide-semiconductor, relay, optocoupler etc., it is not restricted herein.
In one of the present utility model preferably embodiment, overvoltage regulating circuit 11 also includes one end and comparison module 12
Output end connection diode and be coupled to the delay circuit of above-mentioned diode；Delay circuit is used to export in comparison module 12
Charged during high level, and discharged when comparison module 12 exports low level, to reach increase comparison module output
The purpose of voltage action time, that is, voltage action time is extended, the output voltage of PFC control circuit will not be caused shorter
Larger fluctuation is produced in time and causes circuit job insecurity.In the utility model embodiment, diode, which is used to work as, to be prolonged
Isolate discharge loop during slow circuit discharging.
In the utility model embodiment, reference voltage module be PFC control chips reference voltage output end, Huo Zhewei
One circuit being separately provided, for exporting a reference voltage, the output for weighing PFC control circuit is provided for comparison module 12
Voltage whether the standard in rational scope.
In the utility model embodiment, if Master control chip detects that pfc circuit output voltage is higher than preset value, compare
Module 12 will export high level, be charged to delay circuit, now switching device belongs to conducting state, then gain setting resistor 14
The gain for accessing PFC Master control chips sets the resistance of mouth to reduce, i.e. gain reduces, and then causes pfc circuit output voltage drop
It is low；When PFC Master control chips detect that pfc circuit output voltage is less than preset value, comparison module 12 exports low level, delay
Circuit starts to discharge, and when voltage, which drops to, to be not enough to allow switching device to maintain conducting state, switching device is disconnected, and gain is set
The gain that resistance 14 accesses PFC Master control chips sets the resistance of mouth to increase, i.e. gain increases, and then make it that PFC circuits are defeated
Go out voltage rise.Therefore, the signal that adjustment module 13 exports according to comparison module 12, control gain setting resistor 14 access PFC
The gain of Master control chip sets the resistance of mouth, changes gain size, and then pfc circuit output voltage is adjusted.
Overvoltage regulating circuit provided by the utility model, applied to pfc circuit, including comparison module, adjustment module and increasing
Benefit setting resistance；The signal that adjustment module exports according to comparison module, the resistance of control gain setting resistor access, i.e., by changing
Variable-gain adjusts the output voltage of pfc circuit with realizing efficient and sensible, effectively prevent pfc circuit output voltage is too high or mistake
It is low, steady operation when enabling PFC with Larger Dynamic load, it is longer to solve the existing pfc circuit overvoltage regulation mechanism response time
Cause PFC load circuit output voltage fluctuating ranges larger, and then easily cause the problem of circuit reset is restarted, and circuit structure letter
It is single, realize cost control.
It is a kind of pfc circuit that the utility model embodiment one provides shown in Fig. 3, Fig. 4 is that the utility model embodiment carries
A kind of main loop circuit figure of the pfc circuit supplied.
Embodiment one
The utility model embodiment one provides a kind of pfc circuit, in the utility model embodiment, a kind of pfc circuit,
Including：PFC control chips U2, the PFC voltage detecting circuits of output voltage for detecting pfc circuit, reference voltage module, and
Overvoltage regulating circuit 11；Wherein overvoltage regulating circuit 11 includes：Comparison module 12, adjustment module 13 and gain setting resistance 14.
Reference voltage module can be that the reference voltage output end of PFC control chips or a circuit being separately provided are used for
A reference voltage is exported, the output voltage for weighing PFC control circuit is provided whether in rational scope for comparison module
Standard.In the utility model embodiment, carried out so that reference voltage module is the reference voltage output end of PFC control chips as an example
Explanation；Comparison module 12 includes comparator U1；Adjustment module 13 is switching device, can be triode, metal-oxide-semiconductor, relay,
Optocoupler etc., in the utility model embodiment, it is illustrated by triode Q1 of adjustment module；Gain setting resistor includes
Resistance R5 and resistance R6；In the utility model embodiment, PFC control chips U2 is lifted with model UCC28070 chip
Example explanation.
In the utility model embodiment, comparator U1 in-phase input end connection PFC voltage detecting circuits, comparator U1
In-phase input end connection PFC control chips U2 reference voltage output end, comparator U1 output end connecting triode Q1's
Base stage, triode Q1 colelctor electrode connection resistance R6 and grounded emitter, resistance R5 other end connection PFC control chips U2's
IMO ends, resistance R5 other ends ground connection.
In the utility model embodiment, pfc circuit also includes：It is connected to PFC voltage detecting circuits and comparator U1's
PFC output voltage detection resistance RH between in-phase input end, are connected between comparator U1 in-phase input end and ground terminal
PFC output voltage detection resistance RL, the filter capacitor C1 in parallel with PFC output voltage detection resistances RL, are connected to comparator U1
Filter capacitor C2 between ground terminal, the resistance R1 being connected between comparator U1 output end and triode Q1 base stage, even
The resistance R3 being connected between the resistance R1 and triode Q1 base stages and resistance R4 being connected between triode Q1 base stages and ground terminal.
In one of the present utility model preferably embodiment, pfc circuit also includes：It is connected between resistance R1 and R3
Delay circuit and the diode that is connected between resistance R1 and comparator U1 output end.Above-mentioned delay circuit includes a termination
Ground, the resistance R2 and the electric capacity C3 in parallel with resistance R2 of other end access resistance R1 and resistance R3 intermediate node.
The operation principle of Fig. 3, Fig. 4 circuit diagram described further below.
When pfc circuit works, the output voltage of pfc circuit is detected by resistance RH and resistance RL partial pressures.At certain for the moment
Carve, if the output voltage of the pfc circuit detected is higher than preset value, comparator U1 output end output high level, deferred telegram
Road is started to charge up, and now triode Q1 reaches cut-in voltage, triode Q1 conductings, and resistance R5 is short-circuited, only resistance R6 accesses
The gain of PFC control chips sets mouth, then magnitude of voltage U '=I*R6 that PFC control chips detect；If the pfc circuit detected
Output voltage be less than preset value, then comparator U1 output end output low level, resistance R2 to electric capacity C3 discharge, diode
D1 can isolate the discharge loop of delay circuit, and when voltage is less than triode Q1 cut-in voltage, triode Q1 disconnects, resistance R5
The gain that PFC control chips are accessed with R6 sets mouth, then the magnitude of voltage that PFC chips detect is U "=I (R5+R6).
And the gain of PFC control chips sets mouth, i.e. IMO ports can output current IIMO, now PFC control chips according to
The U ' and U " value output pwm signal detected, control metal-oxide-semiconductor Q2 conductings and the time scale disconnected, electric capacity C4 is controlled with this
Charging amplitude, that is, control PFC load voltages.
In the utility model embodiment, as an example, resistance is set to：R5=6.2K, R6=10K. VVAOIt is set to
5V, VVINACFor 0.76V, inherent quantization electric voltage feed forward value KVFF is 0.398V2, and because have：IIMO=(17uA*VVINAC*(VVAO-
1))/KVFF.Data above is now substituted into formula, electric current can be obtained：IIMO=(17uA*0.76* (5-1))/0.398=
130uA。
If triode Q1 is turned on, resistance R5 is short-circuited, U '=IIMO* R6=1.3V；
If triode Q1 disconnects, U "=IIMO(R5+R6)=2.106V.
As shown in figure 4, the output termination metal-oxide-semiconductor Q2 of PFC control chips, pole, electric capacity C4, gain setting resistor 14, bear
Carry circuit it is parallel with one another, and metal-oxide-semiconductor Q2, pole be coupled to electric capacity C4 one end.PFC control chips are according to the U ' and U " detected
Value output pwm signal, control metal-oxide-semiconductor Q2 conductings and the time scale disconnected are controlled electric capacity C4 charging amplitude with this, that is, controlled
The voltage at PFC load circuits both ends is made.The implementation of the utility model embodiment, can be high in pfc circuit output voltage
When preset value, the gain of adjustment access PFC control chips sets the resistance value of mouth, changes load electricity by changing circuit gain
Road both end voltage, make pfc circuit output voltage dynamic adjustable, be maintained at a less fluctuation range, rather than detecting
Pwm signal output is directly turned off when output voltage is excessive and causes circuit reset to restart.In the utility model embodiment, regulation
Module 13 is switching device, can also be MOS pipes, relay, optocoupler etc., if Fig. 5~8 are provided by the utility model
The schematic diagram of another several pfc circuits.
Overvoltage regulating circuit provided by the utility model, applied to pfc circuit, including comparison module, adjustment module and increasing
Benefit setting resistance；The signal that adjustment module exports according to comparison module, the resistance of control gain setting resistor access, that is, pass through tune
Section gain adjusts the output voltage of pfc circuit with realizing efficient and sensible, effectively prevent pfc circuit output voltage is too high or mistake
It is low, steady operation when enabling PFC with Larger Dynamic load, it is longer to solve the existing pfc circuit overvoltage regulation mechanism response time
Cause PFC load circuit output voltage fluctuating ranges larger, and then easily cause that circuit reset restarts asks, and circuit structure letter
It is single, realize cost control.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (7)
1. a kind of overvoltage regulating circuit, applied to pfc circuit, the pfc circuit includes PFC control chips, for detecting PFC electricity
The PFC voltage detecting circuits of the output voltage on road, and reference voltage module；Characterized in that, the overvoltage regulating circuit includes：
Comparison module, adjustment module and gain setting resistance；
The PFC voltage detecting circuits are connected with input of the reference voltage module respectively with the comparison module, the comparison
The output end of module is connected with the adjustment module, the adjustment module and gain setting resistance coupling, the gain setting electricity
Hindering the gain with PFC control chips sets mouth to be connected；
The signal that the adjustment module exports according to the comparison module, control the resistance of the gain setting resistance access.
2. overvoltage regulating circuit as claimed in claim 1, it is characterised in that the comparison module is single-chip microcomputer or comparator.
3. overvoltage regulating circuit as claimed in claim 2, it is characterised in that the comparison module is comparator, the comparison
Delay circuit is additionally provided between the output end of device and the adjustment module, the delay circuit makes the effective of the comparator output
The extended durations of action of level.
4. overvoltage regulating circuit as claimed in claim 3, it is characterised in that the delay circuit includes：One end and the ratio
The diode coupled compared with the output end of device, and the charging mould being coupled between the diode other end and the adjustment module
Block.
5. overvoltage regulating circuit as claimed in claim 1, it is characterised in that the adjustment module includes switching device, described
The control terminal of switching device and the output end of the comparison module couple, input, output end and the increasing of the switching device
Benefit sets resistance to couple, and the gain setting mouth is accessed to adjust gain setting resistor by controlling the state of the switching device
Resistance.
6. overvoltage regulating circuit as claimed in claim 1, it is characterised in that the reference voltage module controls for the PFC
The reference voltage output end of chip, or be a circuit being separately provided.
7. a kind of pfc circuit, it is characterised in that the pfc circuit includes：PFC control chips, for detecting the defeated of pfc circuit
Go out PFC voltage detecting circuits, the reference voltage module of voltage, and overvoltage regulating circuit, the overvoltage regulating circuit such as right will
Ask described in any one of 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720854412.0U CN207053394U (en) | 2017-07-14 | 2017-07-14 | A kind of overvoltage regulating circuit and pfc circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720854412.0U CN207053394U (en) | 2017-07-14 | 2017-07-14 | A kind of overvoltage regulating circuit and pfc circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207053394U true CN207053394U (en) | 2018-02-27 |
Family
ID=61496061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720854412.0U Active CN207053394U (en) | 2017-07-14 | 2017-07-14 | A kind of overvoltage regulating circuit and pfc circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN207053394U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276406A (en) * | 2017-07-14 | 2017-10-20 | 惠州拓邦电气技术有限公司 | A kind of overvoltage regulating circuit |
| CN111665391A (en) * | 2019-03-08 | 2020-09-15 | 杭州海康威视数字技术股份有限公司 | Power class detection device |
-
2017
- 2017-07-14 CN CN201720854412.0U patent/CN207053394U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276406A (en) * | 2017-07-14 | 2017-10-20 | 惠州拓邦电气技术有限公司 | A kind of overvoltage regulating circuit |
| CN111665391A (en) * | 2019-03-08 | 2020-09-15 | 杭州海康威视数字技术股份有限公司 | Power class detection device |
| CN111665391B (en) * | 2019-03-08 | 2022-11-25 | 杭州海康威视数字技术股份有限公司 | Power level detection device |
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