CN204013207U - Two-way interleaved PFC current balance circuit and air conditioner - Google Patents
Two-way interleaved PFC current balance circuit and air conditioner Download PDFInfo
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- CN204013207U CN204013207U CN201420410090.7U CN201420410090U CN204013207U CN 204013207 U CN204013207 U CN 204013207U CN 201420410090 U CN201420410090 U CN 201420410090U CN 204013207 U CN204013207 U CN 204013207U
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- way interleaved
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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 kind of two-way interleaved PFC current balance circuit and air conditioner.Wherein, this circuit comprises: the first sampling resistor, and the first end of the first sampling resistor is connected with the first end of rectification circuit; The first branch road, is comprised of the first switching tube and the first inductance; The second branch road, comprise second switch pipe, the second sampling resistor and the second inductance, wherein, the first end of the second inductance is connected with the first end of the first inductance, the second end of the second inductance is connected with the first end of second switch pipe, the second end of second switch pipe is connected with the first end of the second sampling resistor, and the second end of the second sampling resistor is connected with the second end of the first sampling resistor.By the utility model, solved the problem that two-way interleaved PFC current balance circuit sampling device of the prior art is many, loss is large, realized the way that reduces sample circuit, make circuit simple, and reduced sampling loss.
Description
Technical field
The utility model relates to electronic circuit field, in particular to a kind of two-way interleaved PFC current balance circuit and air conditioner.
Background technology
As shown in Figure 1, existing two-way interleaved PFC current balance circuit mostly adopts the mode of No. three sample circuits, also pass through respectively RS1 ', RS2 ' and RS3 ' sample total current and two single channel electric currents, to reach the object of controlling PWM driving and two-way PFC current balance type, but in existing circuit, exist sampling device many, the shortcoming that loss is large, efficiency is low and cost is high.
Problem for two-way interleaved PFC current balance circuit sampling device is many in prior art, loss is large, not yet proposes effective solution at present.
Utility model content
For the problem that in correlation technique, two-way interleaved PFC current balance circuit sampling device is many, loss is large, effective solution is not yet proposed at present, for this reason, main purpose of the present utility model is to provide a kind of two-way interleaved PFC current balance circuit and air conditioner, to address the above problem.
To achieve these goals, according to an aspect of the present utility model, provide a kind of two-way interleaved PFC current balance circuit, this circuit comprises: the first sampling resistor, and the first end of the first sampling resistor is connected with the first end of rectification circuit; The first branch road, the first switching tube and the first inductance, consist of, wherein, the first end of the first inductance is connected with the second end of rectification circuit, the first end of the first switching tube is connected with the second end of the first inductance, and the second end of the first switching tube is connected with the second end of the first sampling resistor; The second branch road, comprise second switch pipe, the second sampling resistor and the second inductance, wherein, the first end of the second inductance is connected with the first end of the first inductance, the second end of the second inductance is connected with the first end of second switch pipe, the second end of second switch pipe is connected with the first end of the second sampling resistor, and the second end of the second sampling resistor is connected with the second end of the first sampling resistor.
Further, two-way interleaved PFC current balance circuit also comprises: the first operational amplification circuit, be connected with the first sampling resistor, and for being amplified in the voltage signal producing on the first sampling resistor, obtain the first amplifying signal; First signal processor, is connected with the first operational amplification circuit, for determine the total current that flows through the first sampling resistor by the first amplifying signal.
Further, first signal processor comprises: the first sample circuit, is connected with the first operational amplification circuit, for gathering the first amplifying signal by I/O mouth; The first Current calculation device, is connected with the first sample circuit, for using the first amplifying signal to calculate the total current that flows through the first sampling resistor.
Further, two-way interleaved PFC current balance circuit also comprises: the second operational amplification circuit, be connected with the second sampling resistor, and for being amplified in the voltage signal producing on the second sampling resistor, obtain the second amplifying signal; Secondary signal processor, is connected with the second operational amplification circuit, for determine the first-phase electric current that flows through the second sampling resistor by the second amplifying signal.
Further, secondary signal processor comprises: the second sample circuit, is connected with the second operational amplification circuit, for gathering the second amplifying signal by I/O mouth; The second Current calculation device, is connected with the second sample circuit, for using the second amplifying signal to calculate the first-phase electric current that flows through the second sampling resistor.
Further, the 3rd end of the first switching tube is connected with the first drive circuit, for receiving the first pwm signal of the first drive circuit; The 3rd end of second switch pipe is connected with the second drive circuit, for receiving the second pwm signal of the second drive circuit.
Further, two-way interleaved PFC current balance circuit also comprises: controller, is connected with the second Current calculation device with the first Current calculation device respectively, for determine the second-phase electric current of the first branch road according to total current and first-phase electric current.
Further, two-way interleaved PFC current balance circuit also comprises: filter capacitor, the first end of filter capacitor is connected with the second end of the first inductance, and the first end of filter capacitor is also connected with the second end of the second inductance, and the second end of filter capacitor is connected with the second end of the first sampling resistor; Load resistance, the first end of load resistance is connected with the first end of filter capacitor, and the second end of load resistance is connected with the second end of filter capacitor.
Further, two-way interleaved PFC current balance circuit also comprises: the first diode, and the first diode is connected between the first inductance and filter capacitor; The second diode, the second diode is connected between the second inductance and filter capacitor.
To achieve these goals, according to an aspect of the present utility model, provide a kind of air conditioner, this air conditioner comprises above-mentioned two-way interleaved PFC current balance circuit.
By the utility model embodiment, two sampling resistors (the first sampling resistor and the second sampling resistor) have only been used, and sampling resistor is not set in the first branch road, compare existing No. three sample circuits, save LiaoRS3 mono-road current sampling circuit (following Fig. 2), reduced sampling device, circuit implements can be simpler, simultaneously also because reduce the loss on the sampling resistor of Liao Yi road, can make the transformation efficiency of PFC higher, thereby it is many to have solved two-way interleaved PFC current balance circuit sampling device of the prior art, the problem that loss is large, realized the way that reduces sample circuit, make circuit simple, and reduced sampling loss.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is according to the structural representation of the two-way interleaved PFC current balance circuit of prior art;
Fig. 2 is according to the structural representation of the two-way interleaved PFC current balance circuit of the utility model embodiment;
Fig. 3 is the schematic diagram for electric current working method hour of the utility model embodiment; And
The schematic diagram of working method when Fig. 4 is the utility model embodiment larger for electric current.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
Fig. 2 is according to the structural representation of the two-way interleaved PFC current balance circuit of the utility model embodiment.As shown in Figure 2, this circuit can comprise: the first sampling resistor RS1, and the first end of the first sampling resistor is connected with the first end of rectification circuit; The first branch road, the first switching tube Q1 and the first inductance L 1, consist of, wherein, the first end of the first inductance is connected with the second end of rectification circuit, the first end of the first switching tube is connected with the second end of the first inductance, and the second end of the first switching tube is connected with the second end of the first sampling resistor; The second branch road, comprise second switch pipe Q2, the second sampling resistor RS2 and the second inductance L 2, wherein, the first end of the second inductance is connected with the first end of the first inductance, the second end of the second inductance is connected with the first end of second switch pipe, the second end of second switch pipe is connected with the first end of the second sampling resistor, and the second end of the second sampling resistor is connected with the second end of the first sampling resistor.
By the utility model embodiment, two sampling resistors (the first sampling resistor and the second sampling resistor) have only been used, and sampling resistor is not set in the first branch road, compare existing No. three sample circuits, saved a RS3 ' road current sampling circuit, reduced sampling device, circuit implements can be simpler, simultaneously also because reduce the loss on the sampling resistor of Liao Yi road, can make the transformation efficiency of PFC higher, thereby it is many to have solved two-way interleaved PFC current balance circuit sampling device of the prior art, the problem that loss is large, realized the way that reduces sample circuit, make circuit simple, and reduced sampling loss.
By the utility model above-described embodiment, because control circuit is simpler, cost is lower; Because reduced the loss on sampling resistor, can make the transformation efficiency of PFC higher simultaneously.
Embodiment as shown in Figure 2, circuit control principle drawing of the present utility model, RS1, RS2 are respectively the sampling resistor of total current and parafacies (i.e. the second branch road) PFC electric current.Pass through I
always=I
principal phase+ I
parafaciesrelation, only need to know wherein two parameters, just can calculate the 3rd parameter.Wherein, I
alwaysbe the electric current on the RS1 in above-described embodiment, be also total current; I
parafaciesbe the electric current on the second sampling resistor, i.e. first-phase electric current; I
principal phasebe the electric current of the first branch road, i.e. second-phase electric current.
In above-described embodiment of the present utility model, two-way interleaved PFC current balance circuit can also comprise: the first operational amplification circuit, be connected with the first sampling resistor, and for being amplified in the voltage signal producing on the first sampling resistor, obtain the first amplifying signal; First signal processor, is connected with the first operational amplification circuit, for determine the total current that flows through the first sampling resistor by the first amplifying signal.
Particularly, first signal processor can comprise: the first sample circuit, is connected with the first operational amplification circuit, for gathering the first amplifying signal by I/O mouth; The first Current calculation device, is connected with the first sample circuit, for using the first amplifying signal to calculate the total current that flows through the first sampling resistor.
In a kind of optional embodiment of the present utility model, two-way interleaved PFC current balance circuit can also comprise: the second operational amplification circuit, be connected with the second sampling resistor, for being amplified in the voltage signal producing on the second sampling resistor, obtain the second amplifying signal; Secondary signal processor, is connected with the second operational amplification circuit, for determine the first-phase electric current that flows through the second sampling resistor by the second amplifying signal.
Further, secondary signal processor can comprise: the second sample circuit, is connected with the second operational amplification circuit, for gathering the second amplifying signal by I/O mouth; The second Current calculation device, is connected with the second sample circuit, for using the second amplifying signal to calculate the first-phase electric current that flows through the second sampling resistor.
The first operational amplification circuit in the utility model above-described embodiment and the second operational amplification circuit can be same operational amplification circuit, first signal processor and secondary signal processor can be same signal processor, and the first operational amplification circuit (and/or second operational amplification circuit) can be integrated on circuit board with first signal processor (and/or secondary signal processor).
Need to be with further illustrating, two-way interleaved PFC current balance circuit can also comprise: controller, be connected with the second Current calculation device with the first Current calculation device respectively, for using above-mentioned principle to determine the second-phase electric current of the first branch road according to total current and first-phase electric current.
In above-described embodiment of the present utility model, the 3rd end of the first switching tube is connected with the first drive circuit, for receiving the first pwm signal of the first drive circuit; The 3rd end of second switch pipe is connected with the second drive circuit, for receiving the second pwm signal of the second drive circuit.
As shown in Figure 2, two-way interleaved PFC current balance circuit can also comprise: filter capacitor C, the first end of filter capacitor is connected with the second end of the first inductance, the first end of filter capacitor is also connected with the second end of the second inductance, and the second end of filter capacitor is connected with the second end of the first sampling resistor; Load resistance RL, the first end of load resistance is connected with the first end of filter capacitor, and the second end of load resistance is connected with the second end of filter capacitor.
Above-mentioned filter capacitor can not only play the effect of filtering, can also store electrical energy.
Further, as shown in Figure 2, two-way interleaved PFC current balance circuit can also comprise: the first diode D1, and the first diode is connected between the first inductance and filter capacitor; The second diode D2, the second diode is connected between the second inductance and filter capacitor.
The first above-mentioned diode and the second diode can cut off the electric discharge direct current of capacitor C, prevent switching tube short circuit.
Below in conjunction with accompanying drawing 3 and accompanying drawing 4, introduce in detail the utility model.
Fig. 3 is the schematic diagram for electric current working method hour of the utility model embodiment.The schematic diagram of working method when Fig. 4 is the utility model embodiment larger for electric current.
As shown in Figure 3, in the situation that PFC electric current is less, only has principal phase PFC (i.e. the first branch road) work, parafacies PFC (i.e. the second branch road) does not work, and guarantees that the composite loss of PFC is minimum, and now parafacies PFC electric current is zero, the electric current of principal phase PFC equates with PFC total current, i.e. I
always=I
principal phase, by detecting PFC total current (detecting the electric current of the first sampling resistor), can obtain principal phase PFC electric current.
Particularly, PFC total current is by sampling resistor RS1, on RS1, form small voltage signal, by the first operational amplification circuit, carry out voltage amplification, deliver to again chip I/O mouth and carry out AD sampling (being the first signal processor in above-described embodiment), obtain the root-mean-square value (effective value) of PFC electric current: I
principal phase.
As shown in Figure 4, when PFC electric current is larger, major and minor phase PFC works simultaneously, guarantees that composite loss is minimum, and now current relationship is: I
always=I
principal phase+ I
parafacies.
Particularly, parafacies PFC electric current is that the On current by sense switch pipe calculates, switching tube electric current is by the second sampling resistor RS2, on the second sampling resistor, form discontinuous small voltage signal, by the second operational amplification circuit, carry out voltage amplification, deliver to again chip I/O mouth and carry out AD sampling (the second sample circuit by secondary signal processor is sampled), the switching tube On current sampling is carried out to root mean square calculation, can obtain the root-mean-square value (effective value) of parafacies PFC electric current: I
parafacies.
By the PFC total current, the parafacies electric current that detect, can calculate accurately the principal phase electric current of PFC: I
principal phase=I
always-I
parafacies.
After obtaining first-phase electric current and second-phase electric current, the size that compares two phase currents by comparator, when judging wherein another phase current of phase PFC current ratio by comparator and want large, just by controlling the first drive circuit and the second drive circuit, adjust the first pwm signal and/or the second pwm signal.Particularly, can by fine setting, reduce the PWM duty ratio of this phase PFC, its electric current progressively be reduced until equate with another phase current, otherwise just tune up PWM duty ratio, reach the object of biphase current balance.
The utility model also provides a kind of air conditioner, and this air conditioner can comprise any one the two-way interleaved PFC current balance circuit in above-described embodiment.
By the utility model embodiment, two sampling resistors (the first sampling resistor and the second sampling resistor) have only been used, and sampling resistor is not set in the first branch road, compare existing No. three sample circuits, save LiaoRS3 mono-road current sampling circuit (following Fig. 2), reduced sampling device, circuit implements can be simpler, simultaneously also because reduce the loss on the sampling resistor of Liao Yi road, can make the transformation efficiency of PFC higher, thereby it is many to have solved two-way interleaved PFC current balance circuit sampling device of the prior art, the problem that loss is large, realized the way that reduces sample circuit, make circuit simple, and reduced sampling loss.
As can be seen from the above description, the utility model has been realized following technique effect:
By the utility model embodiment, two sampling resistors (the first sampling resistor and the second sampling resistor) have only been used, and sampling resistor is not set in the first branch road, compare existing No. three sample circuits, save LiaoRS3 mono-road current sampling circuit (following Fig. 2), reduced sampling device, circuit implements can be simpler, simultaneously also because reduce the loss on the sampling resistor of Liao Yi road, can make the transformation efficiency of PFC higher, thereby it is many to have solved two-way interleaved PFC current balance circuit sampling device of the prior art, the problem that loss is large, realized the way that reduces sample circuit, make circuit simple, and reduced sampling loss.
The claimed calculator of the utility model, processor and each assembly that forms this processor or calculating are all a kind of entity products that has definite shape, constructs and occupy certain space.For example, microprocessor, signal processor, sub-processor etc. are all can computer equipment, terminal or server independent operating, that have particular hardware structure.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. a two-way interleaved PFC current balance circuit, is characterized in that, comprising:
The first sampling resistor, the first end of described the first sampling resistor is connected with the first end of rectification circuit;
The first branch road, by the first switching tube and the first inductance, formed, wherein, the first end of described the first inductance is connected with the second end of described rectification circuit, the first end of described the first switching tube is connected with the second end of described the first inductance, and the second end of described the first switching tube is connected with the second end of described the first sampling resistor;
The second branch road, comprise second switch pipe, the second sampling resistor and the second inductance, wherein, the first end of described the second inductance is connected with the first end of described the first inductance, the second end of described the second inductance is connected with the first end of described second switch pipe, the second end of described second switch pipe is connected with the first end of described the second sampling resistor, and the second end of described the second sampling resistor is connected with the second end of described the first sampling resistor.
2. two-way interleaved PFC current balance circuit according to claim 1, is characterized in that, described two-way interleaved PFC current balance circuit also comprises:
The first operational amplification circuit, is connected with described the first sampling resistor, for being amplified in the voltage signal producing on described the first sampling resistor, obtains the first amplifying signal;
First signal processor, is connected with described the first operational amplification circuit, for determine the total current that flows through described the first sampling resistor by described the first amplifying signal.
3. two-way interleaved PFC current balance circuit according to claim 2, is characterized in that, described first signal processor comprises:
The first sample circuit, is connected with described the first operational amplification circuit, for gather described the first amplifying signal by I/O mouth;
The first Current calculation device, is connected with described the first sample circuit, for using described the first amplifying signal to calculate the total current that flows through described the first sampling resistor.
4. two-way interleaved PFC current balance circuit according to claim 1, is characterized in that, described two-way interleaved PFC current balance circuit also comprises:
The second operational amplification circuit, is connected with described the second sampling resistor, for being amplified in the voltage signal producing on described the second sampling resistor, obtains the second amplifying signal;
Secondary signal processor, is connected with described the second operational amplification circuit, for determine the first-phase electric current that flows through described the second sampling resistor by described the second amplifying signal.
5. two-way interleaved PFC current balance circuit according to claim 4, is characterized in that, described secondary signal processor comprises:
The second sample circuit, is connected with described the second operational amplification circuit, for gather described the second amplifying signal by I/O mouth;
The second Current calculation device, is connected with described the second sample circuit, for using described the second amplifying signal to calculate the first-phase electric current that flows through described the second sampling resistor.
6. according to the two-way interleaved PFC current balance circuit described in any one in claim 1 to 5, it is characterized in that,
The 3rd end of described the first switching tube is connected with the first drive circuit, for receiving the first pwm signal of described the first drive circuit;
The 3rd end of described second switch pipe is connected with the second drive circuit, for receiving the second pwm signal of described the second drive circuit.
7. two-way interleaved PFC current balance circuit according to claim 6, is characterized in that, described two-way interleaved PFC current balance circuit also comprises:
Controller, is connected with the second Current calculation device with the first Current calculation device respectively, for determine the second-phase electric current of the first branch road according to total current and first-phase electric current.
8. according to the two-way interleaved PFC current balance circuit described in any one in claim 1 to 5, it is characterized in that, described two-way interleaved PFC current balance circuit also comprises:
Filter capacitor, the first end of described filter capacitor is connected with the second end of described the first inductance, and the first end of described filter capacitor is also connected with the second end of described the second inductance, and the second end of described filter capacitor is connected with the second end of described the first sampling resistor;
Load resistance, the first end of described load resistance is connected with the first end of described filter capacitor, and the second end of described load resistance is connected with the second end of described filter capacitor.
9. two-way interleaved PFC current balance circuit according to claim 8, is characterized in that, described two-way interleaved PFC current balance circuit also comprises:
The first diode, described the first diode is connected between described the first inductance and described filter capacitor;
The second diode, described the second diode is connected between described the second inductance and described filter capacitor.
10. an air conditioner, is characterized in that, comprises the two-way interleaved PFC current balance circuit described in any one in claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420410090.7U CN204013207U (en) | 2014-07-23 | 2014-07-23 | Two-way interleaved PFC current balance circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420410090.7U CN204013207U (en) | 2014-07-23 | 2014-07-23 | Two-way interleaved PFC current balance circuit and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN204013207U true CN204013207U (en) | 2014-12-10 |
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ID=52053143
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| CN201420410090.7U Active CN204013207U (en) | 2014-07-23 | 2014-07-23 | Two-way interleaved PFC current balance circuit and air conditioner |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113202A (en) * | 2014-07-23 | 2014-10-22 | 珠海格力电器股份有限公司 | Two-way-interlaced power factor correction (PFC) current balancing circuit and air conditioner |
| CN105591536A (en) * | 2016-02-23 | 2016-05-18 | 珠海格力电器股份有限公司 | Interlaced PFC circuit control method and interlaced PFC circuit control device |
| EP3540448A1 (en) * | 2018-03-14 | 2019-09-18 | Fico Triad, S.A. | Electronic device with pfc circuit and method for measuring alternating current input to the electronic device |
-
2014
- 2014-07-23 CN CN201420410090.7U patent/CN204013207U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113202A (en) * | 2014-07-23 | 2014-10-22 | 珠海格力电器股份有限公司 | Two-way-interlaced power factor correction (PFC) current balancing circuit and air conditioner |
| WO2016011968A1 (en) * | 2014-07-23 | 2016-01-28 | 珠海格力电器股份有限公司 | Two-way-interlaced pfc current balancing circuit and air conditioner |
| CN105591536A (en) * | 2016-02-23 | 2016-05-18 | 珠海格力电器股份有限公司 | Interlaced PFC circuit control method and interlaced PFC circuit control device |
| CN105591536B (en) * | 2016-02-23 | 2018-09-07 | 珠海格力电器股份有限公司 | interleaved PFC circuit control method and device |
| EP3540448A1 (en) * | 2018-03-14 | 2019-09-18 | Fico Triad, S.A. | Electronic device with pfc circuit and method for measuring alternating current input to the electronic device |
| CN110277903A (en) * | 2018-03-14 | 2019-09-24 | 法可特里亚股份有限公司 | The method of the inputted alternating current of electronic device and measurement with pfc circuit |
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