CN202586740U - Pfc control circuit - Google Patents
Pfc control circuit Download PDFInfo
- Publication number
- CN202586740U CN202586740U CN2012202409298U CN201220240929U CN202586740U CN 202586740 U CN202586740 U CN 202586740U CN 2012202409298 U CN2012202409298 U CN 2012202409298U CN 201220240929 U CN201220240929 U CN 201220240929U CN 202586740 U CN202586740 U CN 202586740U
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- 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
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Abstract
The utility model discloses a PFC control circuit. The PFC control circuit includes a PFC boost power circuit module; a sampling module having adjustable sampling coefficients, having a first terminal connecting with an output terminal of the PFC boost power circuit module, and used for sampling the output of the PFC boost power circuit module; and a PFC control module having a first terminal connecting with a second terminal of the sampling module, having a second terminal connecting with the PFC boost power circuit module, and used for controlling the PFC boost power circuit module according to sampling signals of the sampling module. By adopting the PFC control circuit provided by the utility model, the multi-stage adjustment of PFC output voltage can be realized through adjusting the sampling coefficients of the sampling module, thereby realizing the flexible adjustment of the PFC output voltage further.
Description
Technical field
The utility model relates to circuit field, in particular to a kind of PFC control circuit.
Background technology
PFC (Power Factor Correction) also is power factor correction, is generally used for characterizing the degree that is utilized of electric power and to the pollution level of electrical network, pfc circuit is mainly used in and improves harmonic wave, reduces the pollution of load to electrical network.Existing hardware formula PFC control circuit adopts single feedback circuit, and the PFC output voltage is fixed, and can't realize the flexible control to the PFC output voltage.
To the fixing problem of PFC output voltage in the correlation technique, effective solution is not proposed as yet at present.
The utility model content
The main purpose of the utility model is to provide a kind of PFC control circuit, to solve the fixing problem of PFC output voltage.
PFC control circuit according to the utility model comprises: PFC boost power circuit module; The adjustable sampling module of sampling coefficient, first end is connected with the output of PFC boost power circuit module, is used for the output sampling to PFC boost power circuit module; And control the PFC control module of above-mentioned PFC boost power circuit module according to the sampled signal of above-mentioned sampling module, and first end is connected with second end of sampling module, and second end of PFC control module is connected with PFC boost power circuit module.
Further, sampling module comprises: have the sampling unit of a plurality of sampling channels, wherein, the sampling coefficient of a plurality of sampling channels is different; And the channel selecting unit, be connected with sampling unit, be used for confirming that at a plurality of sampling channels the output of a sampling channel is connected with first end of PFC control module.
Further, the channel selecting unit comprises: the analog multiplexer chip, have output, control end and a plurality of input, and a plurality of inputs of analog multiplexer chip are connected with the output of a plurality of sampling channels of sampling unit respectively; And control device; Be connected with the control end of analog multiplexer chip; Be used for controlling an input conducting of output and a plurality of inputs of analog multiplexer chip, wherein, first end of PFC control module is connected with the output of analog multiplexer chip.
Further, sampling unit is a bleeder circuit.
Further; Bleeder circuit comprises: the resistance of a plurality of series connection, and wherein, first end after the series connection is connected with the output of PFC boost power circuit module; The second end ground connection after the series connection, a plurality of inputs of analog multiplexer chip are connected to the node between the resistance of a plurality of series connection.
Further, control device comprises: control chip, and first end is connected with the control end of analog multiplexer chip; First resistance; Second resistance is connected with first resistance, and first end after the series connection is connected with the output of PFC boost power circuit module, the second end ground connection after the series connection; And electric capacity, first end is connected with the output of PFC boost power circuit module, the second end ground connection of electric capacity, and wherein, second end of control chip is connected in the node between first resistance and second resistance.
Further, the analog multiplexer chip is the CD4015 chip.
Further, control chip is DSP or MCU.
Through the utility model, adopt to comprise PFC control circuit: PFC boost power circuit module with the lower part; Be connected with the output of PFC boost power circuit module, be used for sampling module that the output of PFC boost power circuit module is sampled, wherein, the sampling coefficient of this sampling module is adjustable; And be connected respectively with PFC boost power circuit module with sampling module; Be used for PFC control module according to sampled signal control PFC boost power circuit module; Through regulating the sampling coefficient of sampling module; Just can realize the multistage adjustable control of PFC output voltage, solve PFC output voltage fixation problem, and then reach the effect of flexible PFC output voltage.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide the further understanding to the utility model, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the theory diagram according to the PFC control circuit of the utility model first embodiment;
Fig. 2 is the theory diagram according to the PFC control circuit of the utility model second embodiment;
Fig. 3 is the theory diagram according to the PFC control circuit of the utility model the 3rd embodiment;
Fig. 4 is the sketch map according to the analog multiplexer chip of the utility model embodiment; And
Fig. 5 is the control logic figure according to the analog multiplexer chip of the utility model embodiment.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the utility model.
Fig. 1 is the theory diagram according to the PFC control circuit of the utility model first embodiment, and is as shown in Figure 1, and this PFC control circuit comprises: PFC boost power circuit module 1, sampling module 2 and PFC control module 3.
Wherein, PFC boost power circuit module 1 is used for the output voltage of power supply is boosted to certain value; First end of sampling module 2 is connected with the output of PFC boost power circuit module 1, is used for the output sampling to PFC boost power circuit module 1, and wherein, the sampling coefficient of sampling module 2 is adjustable, thus the feedback signal after can obtaining as required sampling; First end of PFC control module 3 is connected with second end of sampling module 2, and second end of PFC control module 3 is connected with PFC boost power circuit module 1, is used for the sampled signal control PFC boost power circuit module 1 according to sampling module 2.
In this embodiment; Through the adjustable sampling module of sampling coefficient is set, select the sampling coefficient as required, thereby select different PFC output voltage sampled signals is fed back to PFC control module 3; So that the corresponding target voltage values of PFC control module 3 control PFC boost power circuit module 1 outputs; Realize the multistage adjustable control of PFC output voltage, solved PFC output voltage fixation problem, and then reached the effect of flexible PFC output voltage.
Fig. 2 is the theory diagram according to the PFC control circuit of the utility model second embodiment, and is as shown in Figure 2, and this PFC control circuit comprises: PFC boost power circuit module 1, sampling unit 21, channel selecting unit 23 and PFC control module 3.
Wherein, PFC boost power circuit module 1 is used for the output voltage of power supply is boosted to certain value; Sampling unit 21 has a plurality of sampling channels, and wherein, the sampling coefficient of a plurality of sampling channels is different, through a plurality of sampling channels the output of PFC boost power circuit module 1 is sampled; Channel selecting unit 23 is connected with sampling unit 21, is used for confirming that at a plurality of sampling channels the output of a sampling channel is connected with first end of PFC control module 3; Second end of PFC control module 3 is connected with PFC boost power circuit module 1, is used for the sampled signal control PFC boost power circuit module 1 according to sampling module 2.
In this embodiment, the different sampling channel of a plurality of sampling coefficients is set, selects the sampling coefficient, realize the multistage adjustable control of PFC output voltage, realize flexible PFC output voltage through selecting sampling channel.
Fig. 3 is the theory diagram according to the PFC control circuit of the utility model the 3rd embodiment; As shown in Figure 3, this PFC control circuit comprises: PFC boost power circuit module, PFC control chip, analog multiplexer chip, the electric capacity circuit module to form with resistance.
Wherein, The output of PFC boost power circuit module is connected with the bleeder circuit module, and wherein, bleeder circuit comprises the resistance R 3 ~ R11 of series connection successively; Wherein, First end after the series connection is connected with the output of PFC boost power circuit module, the second end ground connection after the series connection, and 0 ~ 7 input of analog multiplexer chip is connected to the node between each series resistance.The selection control end of analog multiplexer chip connects DSP/MCU; Input of DSP/MCU control analog multiplexer chip and public output conducting; The public output of analog multiplexer chip is connected to an end of PFC control chip, and the other end of PFC control chip is connected with PFC boost power circuit module.
First resistance R 1 in the PFC control circuit is connected with second resistance R 2, and first end after the series connection is connected with the output of PFC boost power circuit module 1, the second end ground connection after the series connection; First end of capacitor C is connected with the output of PFC boost power circuit module 1, the second end ground connection of capacitor C; Node between first resistance R 1 and second resistance R 2 is connected to DSP/MCU.
Through at the divider resistance of the certain resistance of serial connection between PFC output voltage and the ground obtaining the output voltage feedback signal Vf of different voltage ratio coefficient k, like 0 passage voltage ratio coefficient:
The rest may be inferred can draw the voltage ratio of other passage; Be connected the input signal of these voltage feedback signals with each input respectively as the analog multiplexer chip; DSP/MCU can be as required through controlling the selection control end of analog multiplexer chip; Selection feeds back to the PFC control chip with the PFC output voltage feedback signal in the arbitrary passage of analog multiplexer chip as input signal; The PFC control chip compares this feedback signal and internal reference voltage, and then controls PFC boost power circuit module work and export PFC voltage.
PFC control chip basic functional principle: chip has reference voltage end and feedback end, and its reference voltage terminal voltage Vb can be provided or the outside provides by chip internal, and its feedback end voltage Vf can be provided by the PFC output voltage feedback signal; When Vf＜Vb; The work of PFC control chip control PFC boost power circuit module, when Vf＞Vb, PFC control chip control PFC boost power circuit module quits work; Thereby PFC output voltage V o is stabilized in a certain fixed value scope, and Vo=Vb/k.
Analog multiplexer chip basic functional principle: the analog multiplexer chip has control end, input and public output; Through external control chip controls end signal; Can select input and public output conducting, thereby realize selecting the function of a certain input signal as the output signal with a certain passage.
Preferably, the analog multiplexer chip adopts the CD4051 chip, and its principle schematic is as shown in Figure 4, and its control logic is as shown in Figure 5.Control end has A, B, three of C, input and has 0～7 totally 8 passages and public output.Make conversion chip control end A, B, C signal be respectively at 1,1,0 o'clock through the outside; Then 3 passages and public output conducting; This moment, the public output output signal of conversion chip was the input signal of 3 passages; Same as long as, just can select arbitrary channel input signal as the output signal by control logic truth table control A, B, C signal shown in Figure 5.
Usually; If PFC control chip reference voltage level Vb is 2.5V; The analog multiplexer chip uses CD4051; And the equivalent resistance of divider resistance R3, R4, R5, R6, R7, R8, R9, R10, R11 is respectively 3 megohms, can knows by the computational methods of voltage ratio coefficient k and PFC output voltage V o 510 ohm, 510 ohm, 510 ohm, 470 ohm, 470 ohm, 470 ohm, 470 ohm, 18 kilohms the time; The feedback signal of selecting 0～7 passage respectively is during as the output feedback signal Vf of PFC control chip, and its corresponding PFC output voltage V o is about 354V, 363V, 372V, 383V, 392V, 402V, 413V, 423V respectively.Therefore, when the signal of DSP/MCU control analog multiplexer chip controls end A, B, C was 1,1,0, then the about 383V of PFC control chip control PFC boost power circuit module work output in like manner also can control other 7 kinds of magnitudes of voltage of PFC output.
Hence one can see that, and through this circuit and control method, the output voltage of hardware type pfc circuit scheme is realized can multistage adjusting controlled function.
In this embodiment; Obtain different PFC output voltage sampled signals through bleeder circuit; Select different PFC output voltage sampled signals is fed back to the PFC control chip through DSP/MCU control analog multiplexer chip; The PFC control chip then according to the corresponding target voltage values of output voltage sampled signal control output of feedback, solves the deficiency of the single output voltage values of hardware type PFC control circuit scheme, thereby realizes the multistage regulatory function of output voltage; Make practical application more flexible, for the PFC output voltage realizes following control or segmentation control provides the foundation.
From above description; Can find out; The utility model has been realized following technique effect: the adjustable sampling module of sampling coefficient is set in the PFC control circuit; Through regulating the sampling coefficient of sampling module, just can realize the multistage adjustable control of PFC output voltage, thus can flexible PFC output voltage.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (8)
1. a PFC control circuit is characterized in that, comprising:
PFC boost power circuit module (1);
The adjustable sampling module (2) of sampling coefficient, first end is connected with the output of said PFC boost power circuit module (1), is used for the output sampling to said PFC boost power circuit module (1); And
Control the PFC control module (3) of said PFC boost power circuit module (1) according to the sampled signal of said sampling module (1); First end is connected with second end of said sampling module (2), and second end of said PFC control module (3) is connected with said PFC boost power circuit module (1).
2. PFC control circuit according to claim 1 is characterized in that, said sampling module (2) comprising:
Sampling unit (21) with a plurality of sampling channels, the sampling coefficient of said a plurality of sampling channels is different; And
Channel selecting unit (23) is connected with said sampling unit (21), is used for confirming that at said a plurality of sampling channels the output of a sampling channel is connected with first end of said PFC control module (3).
3. PFC control circuit according to claim 2 is characterized in that, said channel selecting unit (23) comprising:
The analog multiplexer chip has output, control end and a plurality of input, and a plurality of inputs of said analog multiplexer chip are connected with the output of a plurality of sampling channels of said sampling unit (21) respectively; And
Control device is connected with the control end of said analog multiplexer chip, is used for controlling an input conducting of output and said a plurality of inputs of said analog multiplexer chip,
Wherein, first end of said PFC control module is connected with the output of said analog multiplexer chip.
4. PFC control circuit according to claim 3 is characterized in that, said sampling unit (21) is a bleeder circuit.
5. PFC control circuit according to claim 4 is characterized in that, said bleeder circuit comprises:
The resistance of a plurality of series connection; Wherein, First end after the series connection is connected with the output of said PFC boost power circuit module (1), the second end ground connection after the series connection, and a plurality of inputs of said analog multiplexer chip are connected to the node between the resistance of said a plurality of series connection.
6. according to each described PFC control circuit in the claim 3 to 5, it is characterized in that said control device comprises:
Control chip, first end is connected with the control end of said analog multiplexer chip;
First resistance (R1);
Second resistance (R2) is connected with said first resistance (R1), and first end after the series connection is connected with the output of said PFC boost power circuit module (1), the second end ground connection after the series connection; And
Electric capacity (C), first end is connected with the output of said PFC boost power circuit module (1), the second end ground connection of said electric capacity (C),
Wherein, second end of said control chip is connected in the node between said first resistance (R1) and said second resistance (R2).
7. PFC control circuit according to claim 5 is characterized in that, said analog multiplexer chip is the CD4015 chip.
8. PFC control circuit according to claim 6 is characterized in that, said control chip is DSP or MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202409298U CN202586740U (en) | 2012-05-24 | 2012-05-24 | Pfc control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202409298U CN202586740U (en) | 2012-05-24 | 2012-05-24 | Pfc control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202586740U true CN202586740U (en) | 2012-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202409298U Withdrawn - After Issue CN202586740U (en) | 2012-05-24 | 2012-05-24 | Pfc control circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202586740U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427620A (en) * | 2012-05-24 | 2013-12-04 | 珠海格力电器股份有限公司 | Pfc control circuit |
| CN108880250A (en) * | 2018-06-21 | 2018-11-23 | 上海艾为电子技术股份有限公司 | Booster circuit and DC/DC converter |
-
2012
- 2012-05-24 CN CN2012202409298U patent/CN202586740U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427620A (en) * | 2012-05-24 | 2013-12-04 | 珠海格力电器股份有限公司 | Pfc control circuit |
| CN103427620B (en) * | 2012-05-24 | 2016-04-13 | 珠海格力电器股份有限公司 | Pfc control circuit |
| CN108880250A (en) * | 2018-06-21 | 2018-11-23 | 上海艾为电子技术股份有限公司 | Booster circuit and DC/DC converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121205 Effective date of abandoning: 20160413 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |