CN102611296B - Switch switching-off triggering circuit and power factor correction circuit - Google Patents
Switch switching-off triggering circuit and power factor correction circuit Download PDFInfo
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- CN102611296B CN102611296B CN201210065286.2A CN201210065286A CN102611296B CN 102611296 B CN102611296 B CN 102611296B CN 201210065286 A CN201210065286 A CN 201210065286A CN 102611296 B CN102611296 B CN 102611296B
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a switch switching-off triggering circuit and a power factor correction circuit and relates to the field of electric electronics. The power factor correction circuit has the identical practical inductive current when a switch is switched off at different input voltage, the total harmonic distortion (THD) is reduced, and the efficiency is improved. The switch switching-off triggering circuit comprises a given negative current circuit, a current feedback circuit and a comparator, wherein the given negative current circuit generates preset given negative current, the current feedback circuit feeds back the inductive current of the power factor correction circuit to the comparator, and the comparator generates trigger signals for triggering the switch to be switched off when the inductive current of the power factor correction circuit is equal to the given negative current. The given negative current input into the comparator or the inductive current electrically fed back to the comparator is superposed with compensation signals relevant to the input voltage, so the output triggering signals change along the input voltage, and the inductive current on the power factor correction circuit is identical when the switch is triggered to be switched off at different input voltage.
Description
Technical field
The present invention relates to field of power electronics, relate in particular to a kind of switch and turn-off circuits for triggering and circuit of power factor correction.
Background technology
The application of power electronic equipment is increasingly extensive, and the harmonic wave bringing thus and idle problem are also day by day serious, and one of main path addressing this problem is to use power factor correction (Power Factor Correct, PFC) technology.This technology is to add active switch in traditional rectification circuit, by controlling the break-make of active switch, forces input current to change with input voltage, thereby obtain, approaches sinusoidal wave input current and approaches 1 power factor.
Circuit of power factor correction as shown in Figure 1, at the positive half cycle of sinusoidal alternating input voltage, the course of work of this circuit is as follows:
The conducting of Q2 pipe is to inductive energy storage, and Q2 pipe closes has no progeny, and electric current is by managing diode nature afterflow in parallel with Q1, and the conducting of Q1 pipe has realized no-voltage and opened (Zero Voltage Switch, ZVS); Electric current on inductance L r be reduced to 0 rear oppositely, for example, when reverse current being detected and reach given negative current (-2A), turn-off Q 1 pipe; Capacitor C 2 discharges into 0V, and Q2 pipe is opened and realized ZVS, and as shown in Figure 2, its current peak envelope is sinusoidal wave to final inductive current, then obtains and approach sinusoidal wave input current after filtering.Wherein, the shutoff control section of active switch Q1 pipe and Q2 pipe mainly comprises a comparator, an input of comparator is inputted given negative current (for example-2A), the inductive current of another input input feedback of comparator, for example, when the inductive current of feedback being detected and reach given negative current size (-2A), comparator produces cut-off signals, and Q1 pipe or Q2 pipe are turn-offed.
At least there are the following problems for prior art:
Existing switching tube turn-offs in circuits for triggering, from detect-2A, to turn-offing Q1, there is time delay, can allow during this period of time the negative current of correcting circuit additionally increase, and the negative current Δ I of the higher increase of input voltage is less, under result high input voltage, the extra negative current Δ I increasing is little, and under low input, the extra negative current Δ I increasing is large; Equally, at the negative half period of sinusoidal alternating input voltage, Q2 pipe also has Similar Problems, when result is turn-offed Q1 pipe or Q2 pipe in different input voltage sections, the actual negative current obtaining is also inconsistent, affects total harmonic distortion (Total Harmonic Distortion, THD) and the efficiency of circuit.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of switch to turn-off circuits for triggering and circuit of power factor correction, can make circuit of power factor correction under different input voltages, the actual inductance negative current obtaining is all consistent, reduces THD, has improved the efficiency of circuit of power factor correction.
For achieving the above object, embodiments of the invention adopt following technical scheme:
Switch for circuit of power factor correction turn-offs circuits for triggering, comprising: given negative current circuit, current feedback circuit and comparator,
Described given negative current circuit, the given negative current for generation of default, is input to described comparator, and described given negative current is the current value that the described switch of predefined control turn-offs;
Described current feedback circuit, for giving described comparator by the inductor current feedback of described circuit of power factor correction;
Described comparator, while equaling described given negative current for the inductive current when described circuit of power factor correction, produces the triggering signal that trigger switch turn-offs;
Be input to the given negative current of described comparator or feed back to the inductive current of described comparator, be superimposed with the compensating signal relevant to the input voltage of described circuit of power factor correction, described compensating signal is for compensating described inductive current different current values because of the extra increase of described switch turn off delay time under the described input voltage of difference, the described triggering signal of described comparator output is changed with described input voltage, thereby make under different described input voltages, when described triggering signal triggers described switch shutoff, inductive current on described circuit of power factor correction is all consistent.
The switch that the embodiment of the present invention provides turn-offs circuits for triggering and circuit of power factor correction, at switch, turn-off in circuits for triggering, the inductive current that the given negative current of given negative current circuit output or current feedback circuit feed back to comparator, be superimposed with the compensating signal changing with input voltage, make switch turn-off the triggering signal of circuits for triggering output can be with the difference of the input voltage of circuit of power factor correction dynamic adjustments, inductive current while finally making switch under different input voltages turn-off on circuit of power factor correction is all consistent, reduce THD, improved correcting circuit efficiency.
Accompanying drawing explanation
Fig. 1 is circuit of power factor correction schematic diagram of the prior art;
Fig. 2 is the inductive current schematic diagram of circuit of power factor correction in prior art;
Fig. 3 is that the switch in the embodiment of the present invention turn-offs circuits for triggering schematic diagram;
Fig. 4 is that the switch in the embodiment of the present invention one turn-offs circuits for triggering schematic diagram;
Fig. 5 is the concrete structure schematic diagram that Fig. 4 switch turn-offs circuits for triggering;
Fig. 6 is the schematic diagram that in the embodiment of the present invention two, switch turn-offs circuits for triggering;
Fig. 7 is that the switch in the embodiment of the present invention three turn-offs circuits for triggering schematic diagram.
Description of reference numerals
11-comparator, the given negative current circuit of 12-, 13-current feedback circuit;
The constant negative current module of 121-, 122-the first compensating module;
131-current feedback module, 132-the second compensating module.
Embodiment
The embodiment of the present invention provides a kind of switch to turn-off circuits for triggering and circuit of power factor correction, makes circuit of power factor correction under different input voltages, and inductive current when switch turn-offs is all consistent, reduces THD, has improved the efficiency of circuit of power factor correction.
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.Embodiment described herein only, in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the present invention provides a kind of switch for circuit of power factor correction to turn-off circuits for triggering as shown in Figure 3, and this circuit comprises: comparator 11, given negative current circuit 12 and current feedback circuit 13,
Given negative current circuit 12, the given negative current for generation of default, is input to comparator 11, and described given negative current is the current value that the described switch of predefined control turn-offs;
Current feedback circuit 13, for by the inductor current feedback of circuit of power factor correction to comparator 11;
Comparator 11, while equaling given negative current for the inductive current when circuit of power factor correction, produces the triggering signal that trigger switch turn-offs;
Be input to the given negative current of comparator 11 or feed back to the inductive current of comparator 11, be superimposed with the compensating signal relevant to the input voltage of circuit of power factor correction, compensating signal is for compensating described inductive current different current values because of the extra increase of described switch turn-off delay under the described input voltage of difference, make the triggering signal of comparator 11 outputs with the input voltage variation of circuit of power factor correction, thereby make under different input voltages, when triggering signal trigger switch turn-offs, the inductive current on circuit of power factor correction is all consistent.
Wherein, input voltage of the present invention all refers to the input voltage of circuit of power factor correction.Inductive current on circuit of power factor correction, refers to the electric current that flows through inductance component on circuit of power factor correction, and this inductive current is the input current of circuit of power factor correction again after filtering.
The acquisition pattern of compensating signal has multiple, can realize with a lot of signals, as long as the information that comprises AC-input voltage in these signals, such as alternating voltage sample, the driving signal of switch etc.
The switch that the embodiment of the present invention provides turn-offs circuits for triggering, the signal of the signal of given negative current circuit output or current feedback circuit output is superimposed with compensating signal, and compensating signal comprises input voltage information, with input voltage, change, like this switch turn-off the triggering signal of circuits for triggering output can the dynamic change with the difference of input voltage, inductive current while finally making switch under different input voltages turn-off on circuit of power factor correction is all consistent, reduce THD, improved correcting circuit efficiency.
Embodiment mono-
The embodiment of the present invention provides a kind of switch for circuit of power factor correction to turn-off circuits for triggering as shown in Figure 4, and this circuit comprises:
Given negative current circuit 12, current feedback circuit 13 and comparator 11, when comparator 11 equals described given negative current for the inductive current when circuit of power factor correction, produce the triggering signal that trigger switch turn-offs;
When the given negative current that is input to comparator 11 is superimposed with the relevant compensating signal of input voltage to circuit of power factor correction, given negative current circuit 12 comprises:
For generation of the constant negative current module 121 of default given negative current, described constant negative current module is exported constant given negative current;
For exporting the first compensating module 122 of described the first compensating signal, described the first compensating signal is relevant to described input voltage, and when described input voltage is high, described the first compensating signal is large, and when described input voltage is low, described the first compensating signal is little;
The first compensating signal of the first compensating module 122 outputs, is superimposed upon on the constant given negative current of constant negative current module 121 outputs input comparator 11.
Current feedback circuit 13 in the present embodiment is for the inductive current of feedback power factor correcting circuit, and constant negative current module 121 for example, for generation of constant negative current (-2A), being familiar with those skilled in the art is easy to realize, and implementation is various, do not repeat them here.
The first compensating module 122 is for exporting the first compensating signal, the feature of the first compensating signal is relevant to input voltage, when input voltage is high, the first compensating signal is large, when input voltage is low, the first compensating signal is little, is finally input to total given negative current that comparator 11 turn-offs for control switch at input voltage Gao Shi great, little when input voltage is low.
For realizing physical circuit and the signal of the first compensating module 122, have multiple.Wherein, optional, the duty cycle information that comprises AC-input voltage for realizing the signal of the first compensating module 122 functions, when input voltage is high, duty ratio is large, and when input voltage is low, duty ratio is little, such as the driving signal of alternating voltage sampling, switch etc.
Figure 5 shows that a kind of concrete switch turn-offs circuits for triggering, this circuit comprises: comparator 11, and given negative current circuit 12 and current feedback circuit, given negative current circuit 12 comprises: constant negative current module 121 and the first compensating module 122;
Wherein, the first compensating module 122 comprises low pass filter, the high-frequency driving signal PWM2B of the input input switch of described low pass filter.Herein, the signal of the input of low pass filter input is not limited to high-frequency driving signal PWM2B, can be also alternating voltage sampled signal, if having input voltage when high duty ratio large, the little feature of duty ratio when input voltage is low.The input signal of low pass filter duty ratio when high input voltage is large, and during low input, duty ratio is little, just obtains large negative current after filtering under high input voltage, obtains little negative current under low input.
Because switch turn off delay time causes outside negative inductance current capacity the Δ I that increases under different input voltages, inconsistent (under high input voltage, Δ I is little, under low input, Δ I is large), and in the present embodiment because being superimposed with compensating signal, the total given negative current signal that is input to comparator presents under high input voltage large, little feature under low input, the triggering signal that output control switch turn-offs changes with input voltage, high input voltage turn-offs and delays, under low input, turn-off relatively in advance, therefore relative prior art, under high input voltage, Δ I can become large, under low input, Δ I can diminish, the inductive current that while finally making switch turn-off, circuit of power factor correction obtains is more consistent, more approaching sine wave after filtering, reduce THD, improve circuit of power factor correction efficiency.By continuing to optimize the parameter value that forms first each device of compensating module, specific first compensating signal of the first compensating module 122 outputs, be superimposed upon on the constant signal of constant negative current module 121 generations the input of input comparator 11, i.e. 4 pin of comparator 11 in Fig. 5.When comparator turn-offs switch according to the inductive current generation triggering signal of the given negative current signal of this input and feedback, while finally just making switch turn-off, circuit of power factor correction acquisition inductive current is consistent, make the more approaching sine wave of filtered electric current, reduce THD, improve circuit of power factor correction efficiency.
Embodiment bis-
The embodiment of the present invention also provides a kind of switch for circuit of power factor correction to turn-off circuits for triggering as shown in Figure 6, and this circuit comprises:
Comparator 11, given negative current circuit 12 and current feedback circuit,
When comparator 11 equals given negative current for the inductive current when circuit of power factor correction, produce the triggering signal that trigger switch turn-offs;
Current feedback circuit, for giving described comparator by the inductor current feedback of circuit of power factor correction;
When the given negative current that is input to comparator 11 is superimposed with the relevant compensating signal of input voltage to circuit of power factor correction, given negative current circuit 12 comprises: digital signal processor and filter, the high-frequency carrier signal that digital signal processor output is relevant to described input voltage, the input of input comparator 11 after described filter filtering, i.e. 4 pin of comparator 11 in Fig. 6.The duty cycle information that described high-frequency carrier signal comprises described input voltage, described high-frequency carrier signal duty ratio when described input voltage is high is large, and when described input voltage is low, duty ratio is little.
Alternatively, the digital signal processor in Fig. 6 also can be other PWM generator, for sending the high-frequency carrier signal relevant to input voltage.
Digital signal processor input signal in the present embodiment optionally has multiple, as long as the information that these signal kinds comprise AC-input voltage, such as the driving signal of alternating voltage sampling, switching tube etc., the duty cycle information that digital signal processor output signal in the present embodiment comprises AC-input voltage, during input high pressure, duty ratio is little, and during input low pressure, duty ratio is large.
Output signal in the present embodiment duty ratio when input high pressure is little, during input low pressure, duty ratio is large, after filtering, under high pressure, just obtain so large given negative current, under low pressure, obtain little given negative current little, the inductive current that while finally making switch turn-off, circuit of power factor correction obtains is consistent, make the more approaching sine wave of input current, reduce THD, improve the efficiency of circuit of power factor correction.
Embodiment tri-
As shown in Figure 7, the embodiment of the present invention also provides a kind of switch for circuit of power factor correction to turn-off circuits for triggering, comprise: comparator 11, given negative current circuit 12 and current feedback circuit 13, wherein, feed back to the inductive current of comparator 11, while being superimposed with the relevant compensating signal of input voltage to circuit of power factor correction, current feedback circuit 13 comprises:
For the inductor current feedback of described circuit of power factor correction being given to the current feedback module 131 of described comparator;
For exporting the second compensating module 132 of described the second compensating signal, described the second compensating signal is relevant to described input voltage, and when described input voltage is high, described the second compensating signal is little, and when described input voltage is low, described the second compensating signal is large;
Described second compensating signal of the second compensating module 132 outputs is superimposed upon on the signal of current feedback module 131 outputs, then input comparator 11.
The compensating signal that the second compensating module 132 outputs change with input voltage.Wherein, input voltage refers to the inductive current of circuit of power factor correction described in the present embodiment, the feature of the second compensating signal be input voltage when high the second compensating signal little, when input voltage is low, the second compensating signal is large.
In the present embodiment, given negative current circuit 12 is for generation of constant given negative current, current feedback module 131 in current feedback circuit 13 is for exporting the inductor current signal of feedback, being familiar with those skilled in the art is easy to realize, and implementation is various, this is no longer going to repeat them.
And have multiple for realizing physical circuit and the signal of the second compensating module 132.Wherein, optionally, a kind of specific implementation of the second compensating module 132 is, while using input voltage high, duty ratio is little, the large signal of duty ratio when input voltage is low, after filter filtering, obtain the second compensating signal changing with input voltage, its feature is that under high input voltage, the second compensating signal is little again, and under low input, the second compensating signal is large.The second compensating signal is superimposed upon on the current feedback signal of current feedback module 131 outputs, the input of input comparator 11, like this, although given negative current is constant, but be superimposed with the second compensating signal owing to feeding back to the inductive current of comparator 11, the triggering signal that comparator 11 produces still can change with input voltage, the inductive current that while finally making switch turn-off, circuit of power factor correction obtains is consistent, make the more approaching sine wave of input current, reduce THD, improve the efficiency of circuit of power factor correction.
Embodiment tetra-
The embodiment of the present invention also provides a kind of circuit of power factor correction, comprising: comprise that the switch described in above-mentioned any embodiment turn-offs circuits for triggering.
The circuit of power factor correction that the embodiment of the present invention provides, wherein control given negative current signal or current feedback signal that active switch turn-offs, be superimposed with the compensating signal changing with input voltage, making switch turn-off the triggering signal of circuits for triggering output can the dynamic change with the difference of input voltage, inductive current while finally making switch under different input voltages turn-off on circuit of power factor correction is all consistent, reduce THD, improved correcting circuit efficiency.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by the described protection range with claim.
Claims (6)
1. the switch for circuit of power factor correction turn-offs circuits for triggering, comprising: given negative current circuit, current feedback circuit and comparator,
Described given negative current circuit, the given negative current for generation of default, is input to described comparator, and described given negative current is the predefined current value turn-offing for controlling described switch;
Described current feedback circuit, for giving described comparator by the inductor current feedback of described circuit of power factor correction;
Described comparator, while equaling described given negative current for the inductive current when described circuit of power factor correction, produces the triggering signal that trigger switch turn-offs;
It is characterized in that, be input to the given negative current of described comparator or feed back to the inductive current of described comparator, be superimposed with the compensating signal relevant to the input voltage of described circuit of power factor correction, described compensating signal is for compensating described inductive current different current values because of the extra increase of described switch turn off delay time under the described input voltage of difference, the described triggering signal of described comparator output is changed with described input voltage, thereby make under different described input voltages, when described triggering signal triggers described switch shutoff, inductive current on described circuit of power factor correction is all consistent.
2. switch according to claim 1 turn-offs circuits for triggering, it is characterized in that,
When the described given negative current that is input to described comparator is superimposed with the relevant compensating signal of input voltage to described circuit of power factor correction, described given negative current circuit comprises:
For generation of the constant negative current module of default given negative current, described constant negative current module is exported constant given negative current;
For exporting the first compensating module of the first compensating signal, described the first compensating signal is relevant to described input voltage, and when described input voltage is high, described the first compensating signal is large, and when described input voltage is low, described the first compensating signal is little;
Described first compensating signal of described the first compensating module output, is superimposed upon on the constant given negative current of described constant negative current module output, inputs described comparator.
3. switch according to claim 2 turn-offs circuits for triggering, it is characterized in that, described the first compensating module comprises low pass filter, the high-frequency driving signal of the input input switch of described low pass filter.
4. switch according to claim 1 turn-offs circuits for triggering, it is characterized in that, when the given negative current that is input to described comparator is superimposed with the relevant compensating signal of input voltage to described circuit of power factor correction, described given negative current circuit comprises digital signal processor and filter, the described digital signal processor output high-frequency carrier signal relevant to described input voltage, after described filter filtering, input described comparator, the duty cycle information that described high-frequency carrier signal comprises described input voltage, described high-frequency carrier signal duty ratio when described input voltage is high is large, when described input voltage is low, duty ratio is little.
5. switch according to claim 1 turn-offs circuits for triggering, it is characterized in that,
Feed back to the inductive current of described comparator, while being superimposed with the relevant compensating signal of input voltage to described circuit of power factor correction, described current feedback circuit comprises:
For the inductor current feedback of described circuit of power factor correction being given to the current feedback module of described comparator;
For exporting the second compensating module of the second compensating signal, described the second compensating signal is relevant to described input voltage, and when described input voltage is high, described the second compensating signal is little, and when described input voltage is low, described the second compensating signal is large;
Described second compensating signal of described the second compensating module output is superimposed upon on the signal of described current feedback module output, inputs described comparator.
6. a circuit of power factor correction, comprising: the switch described in claim 1 to 5 any one turn-offs circuits for triggering.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210065286.2A CN102611296B (en) | 2012-03-13 | 2012-03-13 | Switch switching-off triggering circuit and power factor correction circuit |
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| CN201210065286.2A CN102611296B (en) | 2012-03-13 | 2012-03-13 | Switch switching-off triggering circuit and power factor correction circuit |
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| CN102611296A CN102611296A (en) | 2012-07-25 |
| CN102611296B true CN102611296B (en) | 2014-09-03 |
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| CN106787621B (en) * | 2016-11-11 | 2019-07-30 | 矽力杰半导体技术(杭州)有限公司 | Compensation circuit and the control circuit for applying it |
| CN109347317A (en) * | 2018-11-07 | 2019-02-15 | 广州金升阳科技有限公司 | A kind of no-voltage pfc converter |
| CN112087129B (en) * | 2020-09-10 | 2022-03-18 | 广州金升阳科技有限公司 | Power factor correction circuit and correction method thereof |
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| US6191565B1 (en) * | 1999-06-14 | 2001-02-20 | Fairchild Korea Semiconductor Ltd. | Power factor compensation controller |
| CN102299628A (en) * | 2010-06-25 | 2011-12-28 | 立锜科技股份有限公司 | Voltage regulator and control circuit and method therefor |
| CN102368661A (en) * | 2011-01-30 | 2012-03-07 | 杭州士兰微电子股份有限公司 | Switching power supply with function of correcting power factor as well as control device and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101030798B1 (en) * | 2007-08-22 | 2011-04-27 | 주식회사 실리콘마이터스 | Power factor correction circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6191565B1 (en) * | 1999-06-14 | 2001-02-20 | Fairchild Korea Semiconductor Ltd. | Power factor compensation controller |
| CN102299628A (en) * | 2010-06-25 | 2011-12-28 | 立锜科技股份有限公司 | Voltage regulator and control circuit and method therefor |
| CN102368661A (en) * | 2011-01-30 | 2012-03-07 | 杭州士兰微电子股份有限公司 | Switching power supply with function of correcting power factor as well as control device and control method thereof |
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