CN203301359U - Active PFC circuit - Google Patents
Active PFC circuit Download PDFInfo
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- CN203301359U CN203301359U CN2013203162954U CN201320316295U CN203301359U CN 203301359 U CN203301359 U CN 203301359U CN 2013203162954 U CN2013203162954 U CN 2013203162954U CN 201320316295 U CN201320316295 U CN 201320316295U CN 203301359 U CN203301359 U CN 203301359U
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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 belongs to the field of power devices of electric appliances, and especially relates to an active PFC circuit. The active PFC circuit comprises a main power unit, a PFC unit, and a filtering unit and an output voltage sampling unit connected with loads, and also comprises an AC voltage sampling unit, a current sampling unit, and an output voltage adjusting unit which is connected between the AC voltage sampling unit and the output voltage sampling unit and corrects DC voltage output to the loads. The circuit adjusts output voltage-adjusting PWM signals according to variation of the AC voltage, so that the DC voltage output to the loads changes with changes of input voltage. The circuit can adapt to application scenarios in which AC input voltage continuously changes, thereby improving power factors of a whole electric appliance. The circuit is low in cost, flexible in application, simple in control, and high in reliability.
Description
Technical field
The utility model belongs to the supply unit field of electrical equipment, relates in particular to a kind of active PFC circuit.
Background technology
The electric equipments such as air conditioner within it section all the handlebar alternating voltage convert the rectification circuit of direct voltage to, with this, form DC power supply, then electric power be fed in each electronic circuit.These rectification circuit great majority are condenser input type, and its input current only circulates and is the pulse type current waveform near the crest voltage waveform, thereby produces harmonic wave in various degree.The appearance of harmonic wave can cause voltage waveform distortion to occur, advance the noise increase of phase electric capacity abnormal heating and motor or transformer, the problems such as volume lowering of power receiving equipment.On the other hand, in alternating current circuit, the cosine of the phase difference between voltage and electric current (Φ) is called power factor, and power factor is higher, and system utilizes the efficiency of energy better.In general non-pure resistance circuit, power factor is all less than 1, and reason is the existence due to inductance in circuit and electric capacity, makes the phase difference between alternating voltage and alternating current be not equal to zero.
PFC(Power Factor Correction, Active PFC) circuit can improve the utilance of electric energy, reduce the pollution of the harmonic wave of power consumption equipment generation to electrical network, especially active PFC circuit can be brought up to power factor value more than 0.99, to greatly improve the active power of circuit and reduce circuit harmonizing wave, so range of application be more and more wider.Present active PFC circuit as shown in Figure 1, determined by divider resistance R1 and R2 by the voltage of the voltage transitions sampled point of its PFC chip.When output voltage is constant, the magnitude of voltage that its sampling obtains is also constant, and the pfc circuit output voltage under this structure is fixed, and following defect and deficiency is arranged: on the one hand, can not be applied to the situation of low-voltage (such as input voltage is 85V), limit its range of application; On the other hand, when the feedback loop appearance of pfc circuit was abnormal, protective circuit, caused that easily PFC boosts extremely effectively, causes whole circuit to be damaged.
The utility model content
The purpose of this utility model is to provide a kind of active PFC circuit, the technical problem that be intended to solve that existing active PFC circuit output voltage is fixed, boost value can not change with input voltage.
The active PFC circuit that the utility model provides, comprise ,PFC unit, main power source unit and the filter unit that joins with load, output voltage sampling unit, and as improvement, described active PFC circuit also comprises:
With described main power source unit, be connected, to the alternating voltage alternating voltage sampling unit of sampling of input;
The current sampling unit that is connected between YuPFC unit, described main power source unit, the electric current of described main power source unit output is sampled; And
The AC-input voltage Vac that is connected between described alternating voltage sampling unit and output voltage sampling unit, obtains according to sampling with the comparison of direct voltage Vdc, corresponding adjusting and output pressure regulation pwm signal to described PFC unit, the output voltage regulon that the direct voltage of exporting to described load is revised.
A kind of active PFC circuit that the utility model provides, except ,PFC unit, main power source unit and the filter unit that joins with load, output voltage sampling unit, the output voltage regulon that also comprises alternating voltage sampling unit, current sampling unit and be connected between described alternating voltage sampling unit and output voltage sampling unit, the direct voltage of exporting to described load is revised.The pressure regulation pwm signal of revising its output is regulated in its variation according to alternating voltage, make the direct voltage of exporting to load follow the variation of input voltage and change, can adapt to the application scenarios that AC-input voltage constantly changes, improved the power factor of whole pfc circuit, cost is low, utilization is flexible, control is simple and reliability is high.
The accompanying drawing explanation
Fig. 1 is the structure diagram of active PFC circuit in prior art;
Fig. 2 is the structured flowchart of the active PFC circuit that provides of the utility model embodiment;
Fig. 3 is the example electronic devices and components figure of the active PFC circuit that provides of the utility model embodiment;
Fig. 4 is the control method realization flow figure of the active PFC circuit that provides of the utility model embodiment;
Fig. 5 is the specific implementation flow chart of step S1 in Fig. 4;
Fig. 6 is the specific implementation flow chart of step S3 in Fig. 4.
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 is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 2 is the structured flowchart of the active PFC circuit that provides of the utility model embodiment; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
A kind of active PFC circuit, comprise 100,PFC unit, main power source unit 200 and the filter unit 300 that joins with load, output voltage sampling unit 400, and as improvement, active PFC circuit also comprises:
With main power source unit 100, be connected, to the alternating voltage alternating voltage sampling unit 500 of sampling of input;
The current sampling unit 600 that is connected between 100YuPFC unit, main power source unit 200, the electric current of main power source unit 100 outputs is sampled; And
The AC-input voltage Vac that is connected between alternating voltage sampling unit 500 and output voltage sampling unit 400, obtains according to sampling is with the comparison of direct voltage Vdc, corresponding adjusting and export the pressure regulation pwm signal to PFC unit 200, the output voltage regulon 700 that the direct voltage of exporting to load is revised.
The active PFC circuit that provides according to the present embodiment, by an output voltage regulon 700, can and export the pressure regulation pwm signal to PFC unit 200 according to the AC-input voltage Vac of sampling acquisition and the comparison of direct voltage Vdc, corresponding adjusting, make and repair up-regulated PFC boost value and can follow input voltage and change, adapt to the application scenarios that AC-input voltage constantly changes, improved the power factor of whole pfc circuit, cost is low, utilization is flexible, control is simple and reliability is high.
Fig. 3 is the example electronic devices and components figure of the active PFC circuit that provides of the utility model embodiment; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
As an embodiment of the present utility model, main power source unit 100 comprises AC power, rectifier bridge stack BR1 and the filter capacitor C1 that joins successively; Two inputs of rectifier bridge stack BR1 meet respectively live wire L and the zero line N of AC power, and the alternating voltage of inputting is carried out to rectification, and filter capacitor C1 leaches the circuit high-frequency noise; Filter unit 300 comprises electrochemical capacitor E1; Electrochemical capacitor E1 is connected between the negative electrode and ground of diode D1, and load RL is attempted by respectively the two ends of electrochemical capacitor E1.
Alternating voltage sampling unit 500 comprises resistance R 5, and the two ends of resistance R 5 connect respectively the live wire L of AC power and the input of output voltage regulon 700.
As an embodiment of the present utility model, output voltage sampling unit 400 comprises resistance R 6 and resistance R 7; Resistance R 6 and resistance R 7 are serially connected between the negative electrode and ground of diode D1 successively, and the public connecting end of resistance R 6 and resistance R 7 is the output of output voltage sampling unit 400.
As an embodiment of the present utility model, output voltage regulon 700 comprises single-chip microcomputer IC2 and NPN type triode Q1; Single-chip microcomputer IC2 is connected with the output of alternating voltage sampling unit 500, the base stage of NPN type triode Q1 connects the pwm signal output of single-chip microcomputer IC2, the drain electrode of NPN type triode Q1 connects the output of output voltage sampling unit 400, the source ground of NPN type triode Q1; The single-chip microcomputer IC2 AC-input voltage Vac that 400 samplings obtain according to the output voltage sampling unit calculates target DC voltage value Vmdc, determines that its correction is interval, magnitude relationship, corresponding adjusting and the output pwm signal of the direct voltage Vdc that obtains according to target DC voltage value Vmdc and sampling, by changing electric current in NPN type triode Q1 drain electrode, the direct voltage of exporting to described load RL being revised.General, all to make the duty ratio of pwm signal increase, the electric current of NPN type triode Q1 drain electrode increases, thereby the electric current that flows through resistance R 6 increases, makes the direct voltage Vdc that exports to load to increase, constantly adjust, until direct voltage Vdc is fallen in the correction interval of target DC voltage value Vmdc.
According to the active PFC circuit that the utility model embodiment provides, the control method realization flow figure of the active PFC circuit that provides as shown in Figure 4:
Step S1: according to the AC-input voltage Vac signal of alternating voltage sampling unit sampling acquisition, calculate the correction interval of target DC voltage value Vmdc, also definite target DC voltage value Vmdc.
In this step, at first the output voltage regulon obtains the AC-input voltage Vac signal that the sampling of alternating voltage sampling unit obtains, and calculates accordingly the correction interval of target DC voltage value Vmdc, also definite target DC voltage value Vmdc.When specific implementation, can adopt flow process shown in Figure 5 to realize.As shown in Figure 5:
Step S11, obtain the AC-input voltage Vac signal that alternating voltage sampling unit sampling obtains.
Step S12, according to the default pfc circuit coefficient M that boosts, by relational expression Vmdc=M*Vac, calculate target DC voltage value Vmdc.
Step S13, determine that the correction of target DC voltage value Vmdc is interval and be [Vmdc-N, Vmdc+N], wherein, N is default voltage correction value.
In the realization of this step S1, most critical be the coefficient M that boosts of pre-set pfc circuit.From on mentality of designing, in the situation that pfc circuit bringing onto load RL, because load RL also will consume a part of electric energy, causes the direct voltage of exporting Vdc to reduce, will boost by pfc circuit.On the basis of the power consumption of balance PFC unit itself and power utilization rate, can set the coefficient M=1.4 that boosts, be Vmdc=1.4*Vac, at this moment target DC voltage value (namely boost value) is close to the peak value of alternating voltage, and this is to consider the coefficient that in the PFC unit, IGBT heating situation obtains.Moreover, according to the concrete environment for use of active PFC circuit and default voltage correction value N, determine that the correction interval of target DC voltage value Vmdc is [Vmdc-N, Vmdc+N].For example, the voltage correction value can be made as 5V, and control system ac power supply voltage effective value Vac is 220V, if a Vac signal is obtained in sampling, is 220V, calculating a corresponding target DC voltage value Vmdc is 320V, revises interval and is 315V to 325V.
Step S2: output pressure regulation pwm signal, the direct voltage of load is exported in the PFC unit according to the duty cycle adjustment of this pwm signal.
In the course of work of whole active PFC circuit, the output voltage regulon can constantly be adjusted output pressure regulation pwm signal, the PFC unit again according to the duty ratio of this pwm signal in real time regulation output to the direct voltage of load RL.
Step S3: obtain the direct voltage Vdc that output voltage sampling unit sampling obtains, judge that described direct voltage Vdc is whether in the correction interval of described target DC voltage value Vmdc: be to think working properly; No, further adjust the duty ratio of the pressure regulation pwm signal of output.
In this step, the direct voltage Vdc that output voltage regulon Real-time Obtaining voltage sample unit sampling obtains, judge in the correction interval of whether its size is determined in step S1 target DC voltage value Vmdc, if represent that active PFC circuit is working properly; If not, further adjust the duty ratio of the pressure regulation pwm signal of output.During specific implementation, can be with reference to flow process shown in Figure 6.As shown in Figure 6:
Step S31, obtain the direct voltage Vdc that output voltage sampling unit sampling obtains;
Step S32, judge that described direct voltage Vdc is whether in the correction interval of described target DC voltage value Vmdc: be to think working properly; No, enter step S33;
If the described direct voltage Vdc of step S33 is less than (Vmdc-N), according to the pre-conditioned duty ratio that progressively increases the pressure regulation pwm signal; If described direct voltage Vdc is greater than (Vmdc+N), according to the pre-conditioned duty ratio that progressively reduces the pressure regulation pwm signal.
In this step S3, direct voltage is regulated according to the pressure regulation pwm signal in the PFC unit, the voltage sample unit sampling obtains a direct voltage Vdc, judges that this direct voltage Vdc is whether in the scope of the correction interval (such as 315V-325V) of the target DC voltage value Vmdc that is determined by step S1.Suppose the Vdc=320V that sampling is obtained, represent that the PFC pressure regulation is normal; If direct voltage Vdc is not in the correction interval of target DC voltage value Vmdc, according to the pre-conditioned duty ratio that progressively increases or reduce the pressure regulation pwm signal, the adjustment that for example can set each time is all to increase or reduce 1% duty ratio.If Vdc=312V, be namely the target voltage values 315V less than minimum, this moment, the output voltage regulon can be revised PWM output, according to the pre-conditioned duty ratio that progressively increases the pressure regulation pwm signal.For example, the adjustment that can set each time is all to increase by 1% duty ratio: if Vdc=328V, be namely the target voltage values 325V greater than maximum, this moment, the output voltage regulon can be revised PWM output, according to the pre-conditioned duty ratio that progressively reduces the pressure regulation pwm signal.For example, the adjustment that can set each time is all to reduce 1% duty ratio.Every adjustment once, all continues the direct voltage Vdc that real-time sampling obtains output, continues to judge that direct voltage Vdc whether in the scope in the correction interval of target DC voltage value Vmdc, finally makes direct voltage Vdc reach the correction interval of target DC voltage value.
Step S4: when the duty ratio of pressure regulation pwm signal be adjusted to default the most at high proportion or during minimum ratio, if described direct voltage Vdc not yet in the correction interval of described target DC voltage value Vmdc, sends the early warning signal of pfc circuit operation irregularity.
In this step, if the duty ratio of pressure regulation pwm signal has been adjusted to default the most at high proportion or during minimum ratio (such as presetting maximum increases or reducing 5% dutyfactor value), if the direct voltage Vdc that sampling is obtained in the correction interval of corresponding target DC voltage value Vmdc, does not send the early warning signal of pfc circuit operation irregularity yet.Increase this step, more improved the security reliability of this active PFC circuit.
In sum, a kind of active PFC circuit and control method thereof that the utility model provides, can be by the single-chip microcomputer in the output voltage regulon, according to the variation of alternating voltage, regulate the pressure regulation pwm signal of revising its output, make the direct voltage of exporting to load follow the variation of input voltage and change, can adapt to the application scenarios that AC-input voltage constantly changes, improve the power factor of whole pfc circuit, cost is low, utilization is flexible, control is simple and reliability is high.
The foregoing is only 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 to more detailed explanation, for a person skilled in the art, it still can be modified or part technical characterictic wherein is equal to replacement the technical scheme that aforementioned each embodiment puts down in writing.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (6)
1. an active PFC circuit, comprise ,PFC unit, main power source unit and the filter unit that joins with load, output voltage sampling unit, it is characterized in that, described active PFC circuit also comprises:
With described main power source unit, be connected, to the alternating voltage alternating voltage sampling unit of sampling of input;
The current sampling unit that is connected between YuPFC unit, described main power source unit, the electric current of described main power source unit output is sampled; And
The AC-input voltage Vac that is connected between described alternating voltage sampling unit and output voltage sampling unit, obtains according to sampling with the comparison of direct voltage Vdc, corresponding adjusting and output pressure regulation pwm signal to described PFC unit, the output voltage regulon that the direct voltage of exporting to described load is revised.
2. active PFC circuit as claimed in claim 1, it is characterized in that: described output voltage regulon comprises single-chip microcomputer IC2 and NPN type triode Q1; Described single-chip microcomputer IC2 is connected with the output of described alternating voltage sampling unit, the base stage of described NPN type triode Q1 connects the pwm signal output of described single-chip microcomputer IC2, the drain electrode of described NPN type triode Q1 connects the output of described output voltage sampling unit, the source ground of described NPN type triode Q1;
The AC-input voltage Vac that described single-chip microcomputer IC2 is obtained by sampling calculates the correction interval of target DC voltage value Vmdc, magnitude relationship, corresponding adjusting and the output pwm signal of the direct voltage Vdc that obtains according to described target DC voltage value Vmdc and sampling, by changing electric current in described NPN type triode Q1 drain electrode, the direct voltage of exporting to described load being revised.
3. active PFC circuit as claimed in claim 1 or 2 is characterized in that:
Described main power source unit comprises AC power, rectifier bridge stack BR1 and the filter capacitor C1 that joins successively; Described rectifier bridge stack BR1 carries out rectification to alternating voltage, and described filter capacitor C1 leaches the circuit high-frequency noise;
Described alternating voltage sampling unit comprises resistance R 5, and the two ends of described resistance R 5 connect respectively the live wire L of described AC power and the input of described output voltage regulon.
4. active PFC circuit as claimed in claim 3, it is characterized in that: described PFC unit comprises PFC chip IC 1, inductance L 1, insulated gate bipolar transistor IGBT and diode D1; Described current sampling unit comprises resistance R 1, resistance R 2, resistance R 3 and resistance R 4;
the output of the described main power source of the first termination unit of described inductance L 1, the second end of described inductance L 1 connects the drain electrode of described insulated gate bipolar transistor IGBT and the anode of described diode D1 simultaneously, the negative electrode of described diode D1 connects described filter unit and described output voltage sampling unit simultaneously, the source ground of described insulated gate bipolar transistor IGBT, the grid of described insulated gate bipolar transistor IGBT connects the driver output pin of described PFC chip IC 1, the output voltage of described PFC chip IC 1 detects pin and connects simultaneously the Voltage loop amplification output pin of self and the output of described output voltage sampling unit,
Described resistance R 3 is connected between the electric current loop input pin and ground of described PFC chip IC 1, described resistance R 2 is connected between the multiplier output pin and ground of described PFC chip IC 1, the two ends of described resistance R 1 connect respectively described resistance R 2, described resistance R 3 end away from described PFC chip IC 1, and described resistance R 4 is connected between the line current sampling input pin of the output of described rectifier bridge stack BR1 and described PFC chip IC 1.
5. active PFC circuit as claimed in claim 4, it is characterized in that: described output voltage sampling unit comprises resistance R 6 and resistance R 7;
Described resistance R 6 and resistance R 7 are serially connected between the negative electrode and ground of described diode D1 successively, and the public connecting end of described resistance R 6 and resistance R 7 is the output of described output voltage sampling unit.
6. active PFC circuit as claimed in claim 5, it is characterized in that: described filter unit comprises electrochemical capacitor E1;
Described electrochemical capacitor E1 is connected between the negative electrode and ground of described diode D1, and described load is attempted by respectively the two ends of described electrochemical capacitor E1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203162954U CN203301359U (en) | 2013-06-03 | 2013-06-03 | Active PFC circuit |
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| CN2013203162954U CN203301359U (en) | 2013-06-03 | 2013-06-03 | Active PFC circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683931A (en) * | 2013-12-27 | 2014-03-26 | 深圳市航嘉驰源电气股份有限公司 | Power supply switching circuit |
| CN104113199A (en) * | 2013-06-03 | 2014-10-22 | 广东美的制冷设备有限公司 | Active PFC circuit and control method thereof |
| CN105226735A (en) * | 2014-06-13 | 2016-01-06 | 国家电网公司 | A kind of alternating current-direct current compatible type Vehicular charger front stage circuits and Vehicular charger |
-
2013
- 2013-06-03 CN CN2013203162954U patent/CN203301359U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113199A (en) * | 2013-06-03 | 2014-10-22 | 广东美的制冷设备有限公司 | Active PFC circuit and control method thereof |
| CN104113199B (en) * | 2013-06-03 | 2018-03-16 | 广东美的制冷设备有限公司 | A kind of active PFC circuit and its control method |
| CN103683931A (en) * | 2013-12-27 | 2014-03-26 | 深圳市航嘉驰源电气股份有限公司 | Power supply switching circuit |
| CN103683931B (en) * | 2013-12-27 | 2016-09-28 | 深圳市航嘉驰源电气股份有限公司 | A kind of power-switching circuit |
| CN105226735A (en) * | 2014-06-13 | 2016-01-06 | 国家电网公司 | A kind of alternating current-direct current compatible type Vehicular charger front stage circuits and Vehicular charger |
| CN105226735B (en) * | 2014-06-13 | 2019-04-09 | 国家电网公司 | A kind of alternating current-direct current compatible type Vehicular charger front stage circuits and Vehicular charger |
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