CN202565159U - PFC control circuit capable of flexibly boosting voltage - Google Patents
PFC control circuit capable of flexibly boosting voltage Download PDFInfo
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- CN202565159U CN202565159U CN2012202409137U CN201220240913U CN202565159U CN 202565159 U CN202565159 U CN 202565159U CN 2012202409137 U CN2012202409137 U CN 2012202409137U CN 201220240913 U CN201220240913 U CN 201220240913U CN 202565159 U CN202565159 U CN 202565159U
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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 capable of flexibly boosting voltage. The PFC control circuit comprises a PFC voltage-boosting power circuit module, an output voltage sampling module, an input voltage sampling module, a load current sampling module, and a PFC control module, wherein the output voltage sampling module is connected with an output end of the PFC voltage-boosting power circuit module, the input voltage sampling module is connected with an input end of the PFC voltage-boosting power circuit module, the load current sampling module is used for sampling the current flowing through the load, the PFC control module is respectively connected with the output voltage sampling module, the input voltage sampling module and the load current sampling module, and is used for controlling the PFC voltage-boosting power circuit module according to sampling signals of the output voltage sampling module, the input voltage sampling module and the load current sampling module. According to the PFC control circuit of the circuit, the PFC output voltage can be flexibly adjusted according to the input voltage and the load, and thus the PFC follow-up control is realized.
Description
Technical field
The utility model relates to circuit field, in particular to a kind of PFC control circuit that can boost flexibly.
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 output voltage can only be fixed, and is difficult to flexibly to realize following function such as boost according to power input voltage, output voltage and load size, limits its range of application.
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 that can boost flexibly, to solve the fixing problem of PFC output voltage.
To achieve these goals, according to providing of the utility model a kind of PFC control circuit that can boost flexibly.
PFC control circuit according to the utility model comprises: PFC boost power circuit module; The output voltage sampling module is connected with the output of PFC boost power circuit module; The input voltage sampling module is connected with the input of PFC boost power circuit module; The load current sampling module, the electric current that is used for the convection current overload is sampled; The PFC control module; Be connected respectively with output voltage sampling module, input voltage sampling module and load current sampling module, be used for sampled signal control PFC boost power circuit module according to output voltage sampling module, input voltage sampling module and load current sampling module.
Further; The PFC control module comprises: processor, be connected respectively with output voltage sampling module, input voltage sampling module and load current sampling module, and be used for calculating target output voltage according to the sampled signal of each sampling module; And at target output voltage during greater than actual output voltage; Export first control signal, during less than actual output voltage, export second control signal at target output voltage; Wherein, First control signal is used to control the output voltage rising of PFC boost power circuit module, and second control signal is used to control the output voltage reduction of PFC boost power circuit module, and actual output voltage is the sampled voltage of output voltage sampling module; And the PFC control chip, be connected with processor, be used for control signal control PFC boost power circuit module according to processor output.
Further, the control signal of processor output is a pwm signal, and the PFC control module also comprises: first resistance, and first end is connected with the control signal output ends of processor, and second end is connected with the PFC control chip; Second resistance, first end are connected in the node between first resistance and the PFC control chip, the second end ground connection of second resistance; And electric capacity, first end is connected in the node between first resistance and the PFC control chip, the second end ground connection of electric capacity.
Further, first resistance is connected with the reference voltage end of PFC control chip, and the output voltage feedback end of PFC control chip is connected with the output of output voltage sampling module.
Further, first resistance is connected with the output voltage feedback end of PFC control chip.
Through the utility model, adopt to comprise PFC control circuit: PFC boost power circuit module with the lower part; The output voltage sampling module that is connected with the output of PFC boost power circuit module; The input voltage sampling module that is connected with the input of PFC boost power circuit module; Be used for load current sampling module that load current is sampled; Be used for PFC control module, solved the fixing problem of PFC output voltage, and then reached can be according to the effect of input voltage and load flexible PFC output voltage according to the sampled signal of each sampling module control PFC boost power circuit module.
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 embodiment;
Fig. 2 is the wiring schematic diagram according to the PFC control circuit of the utility model first embodiment;
Fig. 3 is the PFC boost power circuit module diagram according to the utility model embodiment;
Fig. 4 is the wiring schematic diagram according to the PFC control circuit of the utility model second embodiment;
Fig. 5 is the flow chart according to the PFC control method of the utility model embodiment; And
Fig. 6 is the PFC control effect sketch map according to 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 that can boost flexibly of the utility model embodiment; As shown in Figure 1, this control circuit comprises: PFC boost power circuit module 1, output voltage sampling module 2, input voltage sampling module 3, load current sampling module 4 and PFC control module 5.
Wherein, PFC boost power circuit module 1 is used for the output voltage of power supply is boosted to certain value; Output voltage sampling module 2 is connected with the output of PFC boost power circuit module 1, is used for the output voltage of PFC boost power circuit module 1 is sampled; Input voltage sampling module 3 is connected with the input of PFC boost power circuit module 1, is used for the input voltage of PFC boost power circuit module 1 is sampled; Load current sampling module 4 is used for the electric current that flows through power source loads is sampled; PFC control module 5 is connected respectively with output voltage sampling module 2, input voltage sampling module 3 and load current sampling module 4; Be used for according to the sampled signal of each sampling module control PFC boost power circuit module 1, change and follow function such as load variations with the voltage follow power input voltage of realizing 1 output of PFC boost power circuit module.
The PFC control circuit that adopts this embodiment to provide; Can be according to input voltage and load current flexible PFC output voltage; Solved the fixing problem of PFC output voltage; Follow control for the voltage, the load that realize PFC the basis is provided, effectively reduce power consumption and application cost under the comparable applications condition.
Fig. 2 is the wiring schematic diagram according to the PFC control circuit of the utility model first embodiment; As shown in Figure 2, this control circuit comprises: PFC boost power circuit module, output voltage sampling module, input voltage sampling module, load current sampling module and PFC control chip, DSP/MCU, load control module and resistance and electric capacity.
Wherein, DSP/MCU is a processor, is connected respectively with load control module with output voltage sampling module, input voltage sampling module, load current sampling module; The PFC control chip is connected with DSP/MCU; First end of first resistance R 1 is connected with the control signal output ends of DSP/MCU, and second end of first resistance R 1 is connected with the PFC control chip; First end of second resistance R 2 is connected in the node between first resistance R 1 and the PFC control chip, the second end ground connection of second resistance R 2; First end of capacitor C 1 is connected in the node between first resistance R 1 and the PFC control chip, the second end ground connection of capacitor C 1; Load control module is used for control load run well (like direct current machine etc.).
PFC control chip basic functional principle: chip has reference voltage end and output voltage feedback end, and wherein, second end of first resistance R 1 is connected with reference voltage end; So that the voltage Vb of reference voltage end to be provided; The output voltage sampling module is connected with the output voltage feedback end, so that the voltage Vf of output voltage feedback end to be provided, 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.
The operation principle of this PFC control circuit: earlier by current PFC input voltage value Vin, PFC output voltage values Vo, the load current value Io of DSP/MCU sampling; Calculate current goal PFC output voltage values by certain algorithm synthesis; Target P FC output voltage V t=Vin+ Δ V+Vload for example; Wherein Δ V is a certain fixed voltage value (like 30V, 40V etc.), Vload be the magnitude of voltage relevant with load current value Io (but linear correlation, like Vload=k*Io; Also sectional is relevant, like Io≤4A, and Vload=5V; 4A＜Io≤6A, Vload=10V; 6A＜Io≤9A, Vload=15V; 9A＜Io, Vload=20V etc.), as Vo>during Vt; DSP/MCU judges the current step-down of answering, when Vo < during Vt, then judges current should boosting; The DSP/MCU output frequency is the pwm signal of f, corresponding duty ratio then; Wherein, duty ratio reduces can be with the step-down of PFC output voltage, and duty ratio increases and can the PFC output voltage be boosted; The pwm signal of DSP/MCU output is to the circuit of being made up of current-limiting resistance R1, discharge resistance R2 and storage capacitor C1 and convert dc level signal to; This dc level signal feeds back to the PFC control chip as PFC reference voltage Vb, and last PFC control chip is according to the magnitude relationship of Vb and Vf, and then control PFC boost power module is exported corresponding PFC magnitude of voltage.As shown in Figure 3, during the work of PFC boost power module, can pass through control switching tube Q conducting wherein, the energy storage of PFC inductance L was controlled Q then and was ended this moment, and PFC inductance L discharge this moment is also passed through isolating diode D and is given storage capacitor C charging, to reach the purpose of boosting.
Fig. 4 is the wiring schematic diagram according to the PFC control circuit of the utility model second embodiment; As shown in Figure 4; The difference of this PFC control circuit and PFC control circuit embodiment illustrated in fig. 2 is: the reference voltage of PFC control chip is provided by chip internal; This reference voltage is a fixed value, and second end of first resistance R 1 is connected with the output voltage feedback end of PFC control chip, so that the voltage Vf of output voltage feedback end to be provided.
Adopt Fig. 2 or embodiment shown in Figure 4; PFC output voltage values in the hardware type PFC scheme can be controlled by DSP/MCU fully; Can realize such as fixedly boosting; Linearity follow boost, non-linear follow boost, part follow boost, load follows application function such as boost, and can enlarge the range of application of hardware type PFC, can reduce power consumption and application cost again.
Fig. 5 is the flow chart according to the PFC control method of the utility model embodiment, and is as shown in Figure 5, and this method comprises following step S102 and step S104.
Step S102: the electric current of output voltage, input voltage and the power source loads of sampling power supply.
Step S104: according to output voltage, input voltage and the load current of sampling, the output voltage of control power supply.
Wherein, certain algorithm is set, makes electric power output voltage be certain rule and change, to satisfy demand for control with input voltage and load current according to the control needs.
The PFC control method that adopts this embodiment to provide; Can be according to input voltage and load current flexible PFC output voltage; Solved the fixing problem of PFC output voltage; Follow control for the voltage, the load that realize PFC the basis is provided, effectively reduce power consumption and application cost under the comparable applications condition.
Preferably, step S104 comprises: the target output voltage that calculates power supply according to output voltage, input voltage and the load current of sampling; The output voltage of comparison object output voltage and sampling; During greater than the output voltage of sampling, the output voltage of control power supply raises at target output voltage; And at target output voltage during less than the output voltage of sampling, the output voltage of control power supply reduces.
Adopt the preferred embodiment, according to the target output voltage control electric power output voltage that calculates, control method is simple.
Further preferably; The target output voltage that calculates power supply according to the output voltage of sampling, input voltage and load current comprises: when the power input voltage linear change; According to output voltage, input voltage and the load current of sampling, calculate the target output voltage of power supply, so that the target output voltage of power supply is followed the power input voltage linear change; As shown in Figure 6,2. curve realizes that output voltage rises with slope with power input voltage; Perhaps, when the power input voltage linear change, whether the power input voltage of judging sampling is in the pre-set interval value; When the power input voltage of sampling is in the pre-set interval value,, calculate the target output voltage of power supply, so that the target output voltage of power supply boosts by fixed value according to output voltage, input voltage and the load current of sampling; And,, calculate the target output voltage of power supply, so that the target output voltage of power supply is followed the power input voltage linear change according to output voltage, input voltage and the load current of sampling when the power input voltage of sampling during less than the pre-set interval lower limit; And when the power input voltage of sampling during greater than the pre-set interval higher limit; Output voltage, input voltage and load current according to sampling; Calculate the target output voltage of power supply; So that the target output voltage of power supply is followed the power input voltage linear change, as shown in Figure 5,3. curve is realized that output voltage is partly followed with power input voltage and is boosted.
As shown in Figure 6, to follow boosting mode and 2. 1. compare the specification that can effectively reduce PFC inductance constant power device with fixing boosting mode, expanding application power input voltage scope reduces application cost indirectly; Implementation part is followed to boost and 3. can be guaranteed in a certain specified input voltage range, to export the fixedly value of boosting; With proof load rated power; Outside the rated output voltage scope, then follow and boost; 1. compare the specification that can effectively reduce PFC inductance constant power device with fixing boosting mode, expanding application power input voltage scope reduces application cost etc. indirectly.
From above description; Can find out; The utility model has been realized following technique effect: can be according to input voltage and load current flexible PFC output voltage; Solve the fixing problem of PFC output voltage, followed control for the voltage, the load that realize PFC the basis is provided, effectively reduced power consumption and application cost under the comparable applications condition.
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 (5)
1. the PFC control circuit that can boost flexibly is characterized in that, comprising:
PFC boost power circuit module (1);
Output voltage sampling module (2) is connected with the output of said PFC boost power circuit module (1);
Input voltage sampling module (3) is connected with the input of said PFC boost power circuit module (1);
Load current sampling module (4), the electric current that is used for the convection current overload is sampled;
PFC control module (5); Be connected respectively with said output voltage sampling module (2), said input voltage sampling module (3) and said load current sampling module (4), be used for controlling said PFC boost power circuit module (1) according to the sampled signal of said output voltage sampling module (2), said input voltage sampling module (3) and said load current sampling module (4).
2. PFC control circuit according to claim 1 is characterized in that, said PFC control module (5) comprising:
Processor; Be connected respectively with said output voltage sampling module (2), said input voltage sampling module (3) and said load current sampling module (4); Be used for calculating target output voltage according to the sampled signal of said output voltage sampling module (2), said input voltage sampling module (3) and said load current sampling module (4); And at said target output voltage during greater than actual output voltage; Output is used to control first control signal that the output voltage of said PFC boost power circuit module (1) raises; At said target output voltage during less than said actual output voltage, output is used to control second control signal that the output voltage of said PFC boost power circuit module (1) reduces, and said actual output voltage is the sampled voltage of said output voltage sampling module (2); And
The PFC control chip is connected with said processor, is used for controlling said PFC boost power circuit module (1) according to the control signal of said processor output.
3. PFC control circuit according to claim 2 is characterized in that, the control signal of said processor output is a pwm signal, and said PFC control module (5) also comprises:
First resistance (R1), first end is connected with the control signal output ends of said processor, and second end is connected with said PFC control chip;
Second resistance (R2), first end are connected in the node between said first resistance (R1) and the said PFC control chip, the second end ground connection of said second resistance (R2); And
Electric capacity (C1), first end are connected in the node between said first resistance (R1) and the said PFC control chip, the second end ground connection of said electric capacity (C1).
4. PFC control circuit according to claim 3; It is characterized in that; Said first resistance (R1) is connected with the reference voltage end of said PFC control chip, and the output voltage feedback end of said PFC control chip is connected with the output of said output voltage sampling module (2).
5. PFC control circuit according to claim 3 is characterized in that, said first resistance (R1) is connected with the output voltage feedback end of said PFC control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202409137U CN202565159U (en) | 2012-05-24 | 2012-05-24 | PFC control circuit capable of flexibly boosting voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202409137U CN202565159U (en) | 2012-05-24 | 2012-05-24 | PFC control circuit capable of flexibly boosting voltage |
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| CN202565159U true CN202565159U (en) | 2012-11-28 |
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| CN2012202409137U Withdrawn - After Issue CN202565159U (en) | 2012-05-24 | 2012-05-24 | PFC control circuit capable of flexibly boosting voltage |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427619A (en) * | 2012-05-24 | 2013-12-04 | 珠海格力电器股份有限公司 | PFC control circuit with capability of flexible boosting and control method thereof |
| CN110707921A (en) * | 2019-11-29 | 2020-01-17 | 广东美的制冷设备有限公司 | Control method, control device, household electrical appliance and computer readable storage medium |
| CN111934533A (en) * | 2020-07-15 | 2020-11-13 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof, storage medium and variable-frequency air conditioner |
| CN111934532A (en) * | 2020-07-15 | 2020-11-13 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof and variable-frequency air conditioner |
-
2012
- 2012-05-24 CN CN2012202409137U patent/CN202565159U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427619A (en) * | 2012-05-24 | 2013-12-04 | 珠海格力电器股份有限公司 | PFC control circuit with capability of flexible boosting and control method thereof |
| CN103427619B (en) * | 2012-05-24 | 2015-09-16 | 珠海格力电器股份有限公司 | The PFC control circuit that can boost flexibly and control method thereof |
| CN110707921A (en) * | 2019-11-29 | 2020-01-17 | 广东美的制冷设备有限公司 | Control method, control device, household electrical appliance and computer readable storage medium |
| CN110707921B (en) * | 2019-11-29 | 2021-09-10 | 广东美的制冷设备有限公司 | Control method, control device, household electrical appliance and computer readable storage medium |
| CN111934533A (en) * | 2020-07-15 | 2020-11-13 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof, storage medium and variable-frequency air conditioner |
| CN111934532A (en) * | 2020-07-15 | 2020-11-13 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof and variable-frequency air conditioner |
| CN111934533B (en) * | 2020-07-15 | 2022-02-01 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof, storage medium and variable-frequency air conditioner |
| CN111934532B (en) * | 2020-07-15 | 2022-02-01 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof and variable-frequency air conditioner |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121128 Effective date of abandoning: 20150916 |
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| RGAV | Abandon patent right to avoid regrant |