CN202889188U - Following-type active PFC control circuit - Google Patents
Following-type active PFC control circuit Download PDFInfo
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- CN202889188U CN202889188U CN2012205061900U CN201220506190U CN202889188U CN 202889188 U CN202889188 U CN 202889188U CN 2012205061900 U CN2012205061900 U CN 2012205061900U CN 201220506190 U CN201220506190 U CN 201220506190U CN 202889188 U CN202889188 U CN 202889188U
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- voltage
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- control circuit
- active pfc
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model belongs to the technical field of application of active PFC, and particularly relates to a following-type active PFC control circuit. The novel following-type active PFC control circuit provided by the utility model generates a stable direct-current control level by virtue of conducting the sampling of input rectified alternating-current voltage and performing direct-current peak value demodulating, and sends the stable direct-current control level to a voltage control base pin of a reference voltage stabilization IC; and by adjusting the magnitude of ground current of the voltage control base pin, a voltage stabilization value output by the whole active PFC circuit is changed. Compared with a conventional following control circuit formed by triodes, the control circuit provided by the utility model does not have problems with input impedance and magnification times; and with the adoption of the reference voltage stabilization IC, the voltage sampling errors are completely overcome, the consistency of the control circuit is guaranteed, and the realization cost is low.
Description
Technical field
The utility model belongs to the applied technical field of active PFC, relates in particular to the active PFC control circuit of a kind of trailing type.
Background technology
Active PFC circuit is widely used in each electron-like, the electric equipment products as the power factor correction circuit to electric network source.Existing active PFC circuit, major part are to adopt the mode of output fixed voltage, and the hardware of also releasing in recent years the active PFC control circuit of being followed by software and utilizing the components and parts such as triode to form is followed active PFC control circuit.
But, existing software is followed or hardware is followed active PFC control circuit separately defective is arranged, particularly, in the active PFC control circuit of hardware trailing type, because the characteristics that the nonlinear characteristic of triode and temperature characterisitic are poor, so that the pfc circuit output voltage can not be followed input voltage well, error is very large, can not accomplish that full voltage section linearity follows, can only carry out work with the control mode of non-linear or staged output voltage; And the active PFC control circuit that software is followed, its speed of service is slower than hardware trailing type pfc circuit, and antijamming capability is relatively poor, occurs easily unusually in the course of work, can cause circuit malfunction, and realizes that cost is also higher.
The utility model content
The purpose of this utility model is to provide a kind of trailing type active PFC control circuit, to solve that existing software is followed or hardware follows that the speed that active PFC control circuit exists is slow, antijamming capability is relatively poor, cost is high or full voltage section linearity is followed the technical problem of weak effect.
To achieve these goals, the technical solution adopted in the utility model is:
The active PFC control circuit of a kind of trailing type, its first input end connects the output of the rectification unit of AC power, the positive pole of the described active PFC circuit output voltage of the second input termination, the voltage-reg-ulator tube pin of output termination PFC special chip, as improvement, described control circuit comprises:
Link to each other with the output of the rectification unit of described AC power, an input voltage sampling unit with the small-signal pulsating dc voltage of input voltage same waveform is sampled, exported to the voltage after the rectification;
Link to each other with the output of described input voltage sampling unit, make described small-signal pulsating dc voltage export after treatment the direct current peak detection unit of a pure DC level that equates with described small-signal pulsating dc voltage peak value; And
Input connects respectively the positive pole of the output of described direct current peak detection unit and described active PFC circuit output voltage, the voltage-reg-ulator tube pin of the described PFC special chip of output termination, the size of earth-current is changed the voltage ratio of voltage voltage stabilizing value of whole active PFC circuit output than adjustment unit by adjusting described voltage-reg-ulator tube pin.
Particularly, described input voltage sampling unit comprises: resistance R 1 and resistance R 2; Described resistance R 1 and resistance R 2 are serially connected between the output and ground of rectification unit of described AC power successively, and the common contact of described resistance R 1 and resistance R 2 is the output of described input voltage sampling unit.
Particularly, described direct current peak detection unit comprises: rectifier diode D1 and capacitor C 1; The anode of described rectifier diode D1 connects the output of described input voltage sampling unit, and the negative electrode of described rectifier diode D1 is the output of described direct current peak detection unit, and described capacitor C 1 is connected between the negative electrode and ground of described rectifier diode D1.
More specifically, described voltage ratio comprises than adjustment unit: benchmark voltage stabilizing IC1, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and resistance R 7; The low reference pin of described benchmark voltage stabilizing IC1 connects the output of described direct current peak detection unit, the anode pin of described benchmark voltage stabilizing IC1 is by described resistance R 4 ground connection, the negative electrode pin of described benchmark voltage stabilizing IC1 connects the first end of described resistance R 3, the positive pole of the described active PFC circuit output voltage of the first termination of described resistance R 5, the second end of described resistance R 5 connects the second end of described resistance R 3 and the first end of resistance R 6 simultaneously, the second end of described resistance R 6 is by described resistance R 7 ground connection, and the common contact of described resistance R 6 and resistance R 7 is that described voltage ratio is than the output of adjustment unit, connect the voltage-reg-ulator tube pin of described PFC special chip.
Further, described benchmark voltage stabilizing IC1 comprises TL431 or TL432.
The active PFC control circuit of a kind of novel trailing type that the utility model provides, by the alternating voltage after the rectification of input is sampled and the direct current peak detection, produce a stable dc controling level, deliver to again the voltage control pin of benchmark voltage stabilizing IC, the size of earth-current is changed the voltage voltage stabilizing value of whole active PFC circuit output by adjusting the voltage-reg-ulator tube pin: when the input voltage peak value is high, the DC level that the direct current peak detection goes out is by benchmark voltage stabilizing IC control, the electric current that flows through on the pull down resistor is strengthened, be that the voltage-reg-ulator tube pin increases earth-current, the voltage of output also can raise simultaneously and rapidly; Vice versa, reaches pfc circuit full voltage section linearity and follow effect.The control circuit that the utility model provides, compare with the control circuit of following that existing triode forms, do not have the problem of input impedance and multiplication factor, adopt benchmark voltage stabilizing IC to overcome the error of voltage sample fully, homogeneity of product is secure, and realizes that cost is low.
Description of drawings
Fig. 1 is the structured flowchart of the active PFC control circuit of trailing type that provides of the utility model embodiment;
Fig. 2 is the example electronic devices and components figure of the active PFC control circuit of trailing type that provides of the utility model embodiment;
Fig. 3 is applied to voltage follow design sketch on the domestic air conditioning with the active PFC control circuit of trailing type shown in Figure 2.
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 only in order to explaining the utility model, and be not used in restriction the utility model.
The active PFC control circuit of the trailing type that the utility model provides, comprise that input voltage sampling unit, direct current peak detection unit and voltage ratio are than adjustment unit, particularly by the adjustment of voltage ratio than Circuit tuning, can reach the effect that full voltage section linearity is followed.
Fig. 1 is the structured flowchart of the active PFC control circuit of trailing type that provides of the utility model embodiment; For convenience of explanation, only show the part relevant with present embodiment, as shown in the figure:
The active PFC control circuit of a kind of trailing type, output, the second input that its first input end connects the rectification unit 000 of AC power are connected to the anodal Vout of source pfc circuit output voltage, the voltage-reg-ulator tube pin of output termination PFC special chip 400, particularly, control circuit comprises: input voltage sampling unit 100, direct current peak detection unit 200 and voltage ratio are than adjustment unit 300;
Wherein, input voltage sampling unit 100 links to each other with the output of the rectification unit 000 of AC power, and the voltage after the rectification is sampled and exported a small-signal pulsating dc voltage with the input voltage same waveform; Direct current peak detection unit 200 links to each other with the output of input voltage sampling unit 100, makes the small-signal pulsating dc voltage form a pure DC level that equates with small-signal pulsating dc voltage peak value behind rectifying and wave-filtering; Voltage ratio meets respectively the output of direct current peak detection unit 200 and the anodal Vout of active PFC circuit output voltage than two inputs of adjustment unit 300, the voltage-reg-ulator tube pin of its output termination PFC special chip 400, by adjusting the voltage-reg-ulator tube pin size of earth-current is changed the voltage voltage stabilizing value of whole active PFC circuit output, can reach the effect that full voltage section linearity is followed.
Fig. 2 is the example electronic devices and components figure of the active PFC control circuit of trailing type that provides of the utility model embodiment; For convenience of explanation, only show the part relevant with present embodiment, as shown in the figure:
As an embodiment of the present utility model, input voltage sampling unit 100 comprises: resistance R 1 and resistance R 2; Resistance R 1 and resistance R 2 are serially connected between the output BR+ and ground of rectification unit of AC power successively, and the common contact of resistance R 1 and resistance R 2 is the output of input voltage sampling unit 100.When specific implementation, resistance R 1 can be the equivalent resistance of a plurality of resistance series connection, and concrete resistance can be adjusted according to the needs of whole circuit, does not repeat them here.
As an embodiment of the present utility model, direct current peak detection unit 200 comprises: rectifier diode D1 and capacitor C 1; The anode of rectifier diode D1 connects the output of input voltage sampling unit 100, namely is the dividing point that connects altogether of resistance R 1 and resistance R 2, the negative electrode of rectifier diode D1 is the output of direct current peak detection unit 200, and capacitor C 1 is connected between the negative electrode and ground of rectifier diode D1.Of particular note, the D2 in the circuit is rectifier diode, can use existing conventional withstand voltagely get final product greater than the diode more than the 10V, and capacitor C 1 to use big or small be good as 100PF-10UF and withstand voltage greater than the electric capacity of 10V.
As an embodiment of the present utility model, voltage ratio comprises than adjustment unit 300: benchmark voltage stabilizing IC1, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and resistance R 7; The low reference pin 1 of benchmark voltage stabilizing IC1 connects the output of direct current peak detection unit 200, the anode pin 2 of benchmark voltage stabilizing IC1 is by resistance R 4 ground connection, the first end of the negative electrode pin 3 connecting resistance R3 of benchmark voltage stabilizing IC1, the first end of resistance R 5 is connected to the anodal Vout of source pfc circuit output voltage, the second end of the second end while connecting resistance R3 of resistance R 5 and the first end of resistance R 6, the second end of resistance R 6 is by resistance R 7 ground connection, and the common contact of resistance R 6 and resistance R 7 is that voltage ratio is than the output of adjustment unit 300, meet the voltage-reg-ulator tube pin Vsense of PFC special chip 400.When the specific implementation, described benchmark voltage stabilizing IC1 can adopt TL431, TL432 or other provided as one homogeneous element to the voltage ratio that present embodiment provides than adjustment unit 300.
Fig. 3 is applied to voltage follow design sketch on the domestic air conditioning with the active PFC control circuit of trailing type shown in Figure 2.As shown in the figure:
Because be to test at the family expenses air-conditioning, so only tested the interior effect (namely the input ac voltage shown in the figure is the interval of 180V-260V) of certain single alternating voltage section.As seen from the figure, the active PFC control circuit of the trailing type that the utility model embodiment provides can be so that active PFC circuit realizes the linearity of full voltage section follows, and improves output voltage and adjust the PF value that the parameter of relevant components and parts can complete section voltage and bring up to more than 0.99.
The active PFC control circuit of a kind of novel trailing type that the utility model provides, by the alternating voltage after the rectification of input is sampled and the direct current peak detection, produce a stable dc controling level, deliver to again the voltage control pin of benchmark voltage stabilizing IC, the size of earth-current is changed the voltage voltage stabilizing value of whole active PFC circuit output by adjusting the voltage-reg-ulator tube pin: when the input voltage peak value is high, the DC level that the direct current peak detection goes out is by benchmark voltage stabilizing IC control, the electric current that flows through on the pull down resistor is strengthened, be that the voltage-reg-ulator tube pin increases earth-current, the voltage of output also can raise simultaneously and rapidly; Vice versa, reaches pfc circuit full voltage section linearity and follow effect.The control circuit that the utility model provides, compare with the control circuit of following that existing triode forms, do not have the problem of input impedance and multiplication factor, adopt benchmark voltage stabilizing IC to overcome the error of voltage sample fully, homogeneity of product is secure, and realizes that cost is low.
The above only is preferred embodiment of the present utility model, not in order to limit the utility model, although with reference to previous embodiment the utility model has been carried out more detailed explanation, for a person skilled in the art, it still can be made amendment or part technical characterictic wherein is equal to replacement the technical scheme that aforementioned each embodiment puts down in writing.All any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1. active PFC control circuit of trailing type, its first input end connects the output of the rectification unit of AC power, the positive pole of the described active PFC circuit output voltage of the second input termination, the voltage-reg-ulator tube pin of output termination PFC special chip, it is characterized in that described control circuit comprises:
Link to each other with the output of the rectification unit of described AC power, an input voltage sampling unit with the small-signal pulsating dc voltage of input voltage same waveform is sampled, exported to the voltage after the rectification;
Link to each other with the output of described input voltage sampling unit, make described small-signal pulsating dc voltage export after treatment the direct current peak detection unit of a pure DC level that equates with described small-signal pulsating dc voltage peak value; And
Input connects respectively the positive pole of the output of described direct current peak detection unit and described active PFC circuit output voltage, the voltage-reg-ulator tube pin of the described PFC special chip of output termination, the size of earth-current is changed the voltage ratio of voltage voltage stabilizing value of whole active PFC circuit output than adjustment unit by adjusting described voltage-reg-ulator tube pin.
2. control circuit as claimed in claim 1 is characterized in that, described input voltage sampling unit comprises: resistance R 1 and resistance R 2;
Described resistance R 1 and resistance R 2 are serially connected between the output and ground of rectification unit of described AC power successively, and the common contact of described resistance R 1 and resistance R 2 is the output of described input voltage sampling unit.
3. control circuit as claimed in claim 1 is characterized in that, described direct current peak detection unit comprises: rectifier diode D1 and capacitor C 1;
The anode of described rectifier diode D1 connects the output of described input voltage sampling unit, and the negative electrode of described rectifier diode D1 is the output of described direct current peak detection unit, and described capacitor C 1 is connected between the negative electrode and ground of described rectifier diode D1.
4. control circuit as claimed in claim 1 is characterized in that, described voltage ratio comprises than adjustment unit: benchmark voltage stabilizing IC1, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and resistance R 7;
The low reference pin of described benchmark voltage stabilizing IC1 connects the output of described direct current peak detection unit, the anode pin of described benchmark voltage stabilizing IC1 is by described resistance R 4 ground connection, the negative electrode pin of described benchmark voltage stabilizing IC1 connects the first end of described resistance R 3, the positive pole of the described active PFC circuit output voltage of the first termination of described resistance R 5, the second end of described resistance R 5 connects the second end of described resistance R 3 and the first end of resistance R 6 simultaneously, the second end of described resistance R 6 is by described resistance R 7 ground connection, and the common contact of described resistance R 6 and resistance R 7 is that described voltage ratio is than the output of adjustment unit, connect the voltage-reg-ulator tube pin of described PFC special chip.
5. control circuit as claimed in claim 4 is characterized in that, described benchmark voltage stabilizing IC1 comprises TL431 or TL432.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205061900U CN202889188U (en) | 2012-09-28 | 2012-09-28 | Following-type active PFC control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205061900U CN202889188U (en) | 2012-09-28 | 2012-09-28 | Following-type active PFC control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202889188U true CN202889188U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012205061900U Expired - Lifetime CN202889188U (en) | 2012-09-28 | 2012-09-28 | Following-type active PFC control circuit |
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| Country | Link |
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| CN (1) | CN202889188U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448538A (en) * | 2018-04-03 | 2018-08-24 | 深圳茂硕电子科技有限公司 | A kind of overvoltage crowbar and its method |
| CN109039214A (en) * | 2018-08-08 | 2018-12-18 | 浙江鲲悟科技有限公司 | Adjust the method and system of DC bus-bar voltage |
-
2012
- 2012-09-28 CN CN2012205061900U patent/CN202889188U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448538A (en) * | 2018-04-03 | 2018-08-24 | 深圳茂硕电子科技有限公司 | A kind of overvoltage crowbar and its method |
| CN109039214A (en) * | 2018-08-08 | 2018-12-18 | 浙江鲲悟科技有限公司 | Adjust the method and system of DC bus-bar voltage |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |