CN203377786U - A pfc converter - Google Patents
A pfc converter Download PDFInfo
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- CN203377786U CN203377786U CN201320430579.6U CN201320430579U CN203377786U CN 203377786 U CN203377786 U CN 203377786U CN 201320430579 U CN201320430579 U CN 201320430579U CN 203377786 U CN203377786 U CN 203377786U
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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 relates to a PFC converter comprising a rectifier bridge, an inductor, a diode, an input voltage detecting circuit, an input current detecting circuit, an output voltage detecting circuit, a control circuit, a driving circuit, a first switching tube unit, and a second switching tube unit. The first switching tube unit employs topological structure including a parallel IGBT while the second switching tube unit employs topological structure including a parallel MOSFET. In an operating process, the MOSFET is turned on before the IGBT is turned on but is turned off after the IGBT is turned off. This method utilizes a characteristic that the IGBT has low turn-on loss and the MOSFET has low turn-on loss and turn-off loss. Therefore, the advantages of the IGBT and the MOSFET are used while the defects of the IGBT and the MOSFET are overcome. As a result, the IGBT is provided with a switching characteristic of zero voltage turning on and an approximate switching characteristic of low current turning off. Thus, power density is increased; switching loss is decreased; and the efficiency of a PFC circuit is increased.
Description
Technical field
The utility model belongs to the supply unit field, relates in particular to a kind of PFC transducer.
Background technology
The power electronic equipments such as air conditioner within it section all the handlebar alternating voltage convert the rectification circuit of direct voltage to, form DC power supply with this, 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 all is 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.
In order to improve power factor, to reduce Harmonics of Input content, mostly adopt PFC(Power Factor Correction in power electronic equipment, Active PFC) circuit is regulated, the waveform of input current and the waveform of line voltage are coincide, also by pfc circuit, carry out the control inputs electric current, make the waveform " sineization " of input current.In existing pfc circuit, switching tube generally adopts IGBT, and in order to reduce the volume of inductance, the power density of raising system, the switching frequency of pfc circuit is generally all higher, and the switching loss of IGBT also increases along with the rising of switching frequency, so just reduced the conversion efficiency of pfc circuit.
The utility model content
In order to solve the problems of the technologies described above, the purpose of this utility model is to provide a kind of PFC transducer, to improve the power density of system, reduces the loss of system, improves the overall efficiency of system.
To achieve these goals, the technical solution adopted in the utility model is:
The PFC transducer that the utility model provides comprises:
A kind of PFC transducer, comprise rectifier bridge B1, inductance L 1, diode D1, input voltage detection circuit, input current testing circuit and output voltage detecting circuit, two inputs of described rectifier bridge B1 connect respectively live wire and the zero line of alternating current, the cathode output end of described rectifier bridge B1 connects the first end of described inductance L 1, the cathode output end of described rectifier bridge B1 connects the first end of described input current testing circuit, the negative pole end of the second termination DC bus of described input current testing circuit, described input voltage detection circuit just is being connected to described rectifier bridge B1, between cathode output end, the anode of the described diode D1 of the second termination of described inductance L 1, the negative electrode of described diode D1 connects the positive terminal of DC bus, described output voltage detecting circuit just is being connected to DC bus, between negative pole end, as improvement, described PFC transducer also comprises:
The control circuit be connected with the output of the output of the output of described input voltage detection circuit, input current testing circuit and output voltage detecting circuit respectively; And
With the pwm control signal output of described control circuit, be connected, in order to drive the drive circuit of the first switching tube unit VT1 and second switch pipe unit VT2;
Wherein, described the first switching tube unit VT1 and described second switch pipe unit VT2 are connected in parallel between the negative pole end of the second end of described inductance L 1 and DC bus, described the first switching tube unit VT1 adopts the IGBT switching tube, and described second switch pipe unit VT2 adopts the switch mosfet pipe; The drain electrode of the collector electrode of described the first switching tube unit VT1 and described second switch pipe unit VT2 is connected on the second end of described inductance L 1 altogether, the source electrode of the emitter of described the first switching tube unit VT1 and described second switch pipe unit VT2 is connected on the negative pole end of described DC bus altogether, and the grid of the grid of described the first switching tube unit VT1 and described second switch pipe unit VT2 connects respectively the first output and second output of described drive circuit.
The PFC transducer that the utility model provides, comprise rectifier bridge B1, inductance L 1, diode D1, input voltage detection circuit, input current testing circuit, output voltage detecting circuit and control circuit, drive circuit and the first switching tube unit VT1 and second switch pipe unit VT2, the first switching tube unit VT1 and second switch pipe unit VT2 adopt respectively the topological structure of IGBT and MOSFET parallel connection.In the course of the work, the MOSFET of second switch pipe unit VT2 is turn-offed prior to the IGBT conducting of the first switching tube unit VT1, the IGBT that lags behind the first switching tube unit VT1, MOSFET is that IGBT creates the soft switch condition that no-voltage is opened (ZVS) and approached zero-current switching (ZCS), thereby greatly reduces the switching loss of IGBT; The passage of On current shunting is provided for IGBT again after the whole conductings of MOSFET, has reduced on the whole the conduction loss of switching tube.This method utilizes that the IGBT conduction loss is low, power MOSFET open the characteristic low with turn-off power loss, both advantages have been taken into account, both deficiencies have been overcome, make IGBT there is the approximate soft switching characteristic that soft switching characteristic that no-voltage opens and little electric current turn-off, improved power density, reduce switching loss, improved the efficiency of pfc circuit.
The accompanying drawing explanation
Fig. 1 is the structure chart of the PFC transducer that provides of the utility model the first embodiment;
Fig. 2 is the structure chart of the PFC transducer that provides of the utility model the second embodiment;
Fig. 3 is the structure chart of the PFC transducer that provides of the utility model the 3rd embodiment;
Fig. 4 is the structural representation of drive circuit in the PFC transducer that provides of the utility model the 4th embodiment;
Fig. 5 is the pwm control signal oscillogram that grid level that Fig. 4 drive circuit of providing of the utility model the 5th embodiment produces drives.
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. 1 is the structure chart of the PFC transducer that provides of the utility model the first embodiment; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
A kind of PFC transducer, comprise rectifier bridge B1, inductance L 1, diode D1, input voltage detection circuit 10, input current testing circuit 20, output voltage detecting circuit 30, control circuit 40, drive circuit 50 and the first switching tube unit VT1, second switch pipe unit VT2;
Two inputs of rectifier bridge B1 connect respectively live wire and the zero line of alternating current Vac, the cathode output end of rectifier bridge B1 connects the first end of inductance L 1, the cathode output end of rectifier bridge B1 connects the first end of input current testing circuit 20, the negative pole end VDC-of the second termination DC bus of input current testing circuit 20, input voltage detection circuit 10 just is being connected to rectifier bridge B1, between cathode output end, the anode of the second terminating diode D1 of inductance L 1, the negative electrode of diode D1 meets the positive terminal VDC+ of DC bus, output voltage detecting circuit 30 is connected between the positive terminal VDC+ and negative pole end VDC-of DC bus, control circuit 40 is connected with the output of output voltage detecting circuit 30 with the output of input voltage detection circuit 10, the output of input current testing circuit 20 respectively, and drive circuit 50 is connected with the pwm control signal output of control circuit 40, in order to drive the first switching tube unit VT1 and second switch pipe unit VT2,
And the first switching tube unit VT1 and second switch pipe unit VT2 are connected in parallel between the negative pole end VDC-of the second end of inductance L 1 and DC bus, the first switching tube unit VT1 adopts the IGBT switching tube, and second switch pipe unit VT2 adopts the switch mosfet pipe; The drain electrode of the collector electrode of the first switching tube unit VT1 and second switch pipe unit VT2 is connected on the second end of inductance L 1 altogether, the source electrode of the emitter of the first switching tube unit VT1 and second switch pipe unit VT2 is connected on the negative pole end VDC-of DC bus altogether, and the grid of the grid of the first switching tube unit VT1 and second switch pipe unit VT2 connects respectively the first output and second output of drive circuit 50.
As a preferred embodiment, the PFC transducer also comprises a storage capacitor C1; Storage capacitor C1 is connected between the positive terminal VDC+ and negative pole end VDC-of DC bus.
Wherein, the first switching tube unit VT1 and second switch pipe unit VT2 adopt the pwm control signal of control circuit 40 outputs to carry out break-make control, within the cycle of each pwm control signal, second switch pipe unit VT2 lags behind the first switching tube unit VT1 and turn-offs prior to the first switching tube unit VT1 conducting.Further, in this first embodiment, the first switching tube unit VT1 adopts, and what be that an IGBT switching tube, second switch pipe unit VT2 adopt is a switch mosfet pipe, and this switch mosfet pipe, prior to the conducting of IGBT switching tube, turn-offs and lag behind the IGBT switching tube.
In fact, when specific implementation, the first switching tube unit VT1 can adopt the IGBT switching tube of a plurality of parallel connections, the switch mosfet pipe that second switch pipe unit VT2 also can adopt a plurality of parallel connections.Below by two specific embodiments, describe.
Referring to Fig. 2.Fig. 2 is the structure chart of the PFC transducer that provides of the utility model the second embodiment; For convenience of explanation, only show the part relevant to the present embodiment.With the PFC transducer shown in the first embodiment, compare, the PFC transducer difference that this second embodiment provides only is: the first switching tube unit VT1 adopts the IGBT switching tube of a plurality of parallel connections, and IGBT switching tube VT11 and the VT12 of two parallel connections of take in this figure is example.As shown in the figure: VT11 and VT12 are two IGBT switching tubes in parallel, and VT2 is the switch mosfet pipe, and the grid of VT11 and the grid of VT12 directly link together, and then with the first output of drive circuit 50, are connected.
Referring to Fig. 3.Fig. 3 is the structure chart of the PFC transducer that provides of the utility model the 3rd embodiment; Same, for convenience of explanation, only show the part relevant to the present embodiment.With the PFC transducer shown in the first embodiment, compare, the PFC transducer difference that this 3rd embodiment provides only is: second switch pipe unit VT2 adopts the switch mosfet pipe of a plurality of parallel connections, and switch mosfet pipe VT21 and the VT22 of two parallel connections of take in this figure is example.As shown in the figure: VT21 and VT22 are two switch mosfet pipes in parallel, and VT1 is the IGBT switching tube, and the grid of VT21 and the grid of VT22 directly link together, and then with the second output of drive circuit 50, are connected.
No matter the first switching tube unit VT1 is one or more IGBT switching tubes or second switch pipe unit VT2 is one or more switch mosfet pipes, its actual operation principle is consistent, within the cycle of each pwm control signal, be all that second switch pipe unit VT2 lags behind the first switching tube unit VT1 shutoff prior to the first switching tube unit VT1 conducting.
For the structure of this PFC transducer is described better, Fig. 4 shows the structural representation of the drive circuit that the utility model the 4th embodiment provides; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
The first end of the control signal PWM output while connecting resistance R1 of control circuit 40 and the first end of resistance R 2, the second end of resistance R 1 connects the base stage of NPN type triode Q1 and the base stage of positive-negative-positive triode Q2 simultaneously, the collector electrode of NPN type triode Q1 meets positive supply+VCC, the emitter of NPN type triode Q1 and the emitter of positive-negative-positive triode Q2 are connected on the first end of resistance R 3 altogether, the collector electrode of positive-negative-positive triode Q2 meets negative supply-VEE, the first output that the second end of resistance R 3 is drive circuit 50, connect the grid G 1 of the first switching tube unit VT1, resistance R 4 is connected between second end and ground of resistance R 3, the second end of the negative electrode connecting resistance R3 of voltage-stabiliser tube ZD1, the anode of voltage-stabiliser tube ZD1 connects the anode of voltage-stabiliser tube ZD2, the minus earth of voltage-stabiliser tube ZD2,
The second end of resistance R 2 connects the base stage of NPN type triode Q3 and the base stage of positive-negative-positive triode Q4 simultaneously, the collector electrode of NPN type triode Q3 meets positive supply+VCC, the emitter of NPN type triode Q3 and the emitter of positive-negative-positive triode Q4 are connected on the first end of resistance R 5 altogether, the collector electrode of positive-negative-positive triode Q4 meets negative supply-VEE, the second output that the second end of resistance R 5 is drive circuit 50, connect the grid G 2 of second switch pipe unit VT2, resistance R 6 is connected between second end and ground of resistance R 5, the second end of the negative electrode connecting resistance R5 of voltage-stabiliser tube ZD3, the anode of voltage-stabiliser tube ZD3 connects the anode of voltage-stabiliser tube ZD4, the minus earth of voltage-stabiliser tube ZD4.
Preferably, resistance R 1 equates with the resistance of resistance R 2, the resistance of resistance R 4 and resistance R 6 equates, and the resistance of resistance R 3 is greater than the resistance of resistance R 4.
In this drive circuit, resistance R 4 has formed the grid pull down resistor of IGBT switching tube in the first switching tube unit VT1, and resistance R 6 has formed the grid pull down resistor of switch mosfet pipe in second switch pipe unit VT2.Resistance R 3 has formed the gate series resistance of IGBT switching tube in the first switching tube unit VT1, resistance R 5 has formed the gate series resistance of switch mosfet pipe in second switch pipe unit VT2, in the circuit parameter configuration, make the resistance of resistance R 3 be greater than the resistance of resistance R 4, utilize the grid input capacitance of IGBT and MOSFET, form and drive signal delay circuit, make like this in second switch pipe unit VT2 the switch mosfet pipe prior to IGBT switching tube conducting in the first switching tube unit VT1, and lag behind IGBT switching tube in the first switching tube unit VT1, turn-off, utilize the IGBT conduction loss low, and power MOSFET open the characteristic low with turn-off power loss, both advantages have been taken into account, both deficiencies have been overcome, make IGBT switching tube in the first switching tube unit VT1 there is the approximate soft switching characteristic that soft switching characteristic that no-voltage opens and little electric current turn-off.
Particularly, the control method of above-mentioned PFC transducer comprises:
And, within the cycle of each pwm control signal, second switch pipe unit VT2 lags behind the first switching tube unit VT1 and turn-offs prior to the first switching tube unit VT1 conducting.
The pwm control signal oscillogram that the grid level that Fig. 5 is the generation of drive circuit shown in Fig. 4 drives.In figure, G1_PWM is the grid PWM drive waveforms of IGBT switching tube in the first switching tube unit VT1, G2_PWM is the grid PWM drive waveforms of switch mosfet pipe in second switch pipe unit VT2, and the switch mosfet pipe lags behind all the time the IGBT switching tube and turn-offs prior to the conducting of IGBT switching tube.
Preferably, in second switch pipe unit VT2, the switch mosfet pipe is td (on) 2+tr2 prior to the leading time of IGBT switching tube conducting in the first switching tube unit VT1, what wherein td (on) 2 was switch mosfet pipe in second switch pipe unit VT2 opens time of delay, and tr2 is the opening current rise time of switch mosfet pipe in second switch pipe unit VT2.
Preferably, in second switch pipe unit VT2, to lag behind the lag time that IGBT switching tube in the first switching tube unit VT1 turn-offs be td (off) 1+tf1 to the switch mosfet pipe, the turn-off delay time that wherein td (off) 1 is IGBT switching tube in the first switching tube unit VT1, the cut-off current fall time that tf1 is IGBT switching tube in the first switching tube unit VT1.
Such as, the IGBT switching tube adopts the IKW50N60T of Infineon company, the switch mosfet pipe adopts the IPW60R041C6 of Infineon company, wherein switch mosfet pipe IPW60R041C6's opens td time of delay (on) 2 for 23ns, opening current rise time tr2 is 10ns, the turn-off delay time td (off) 1 of IGBT switching tube IKW50N60T is 341ns, and cut-off current tf1 fall time is 55ns.Therefore, preferably, the switch mosfet pipe is set to td (on) 2+tr2=23ns+10ns=33ns prior to the leading time of IGBT switching tube conducting, and can be set to td (off) 1+tf1=341ns+55ns=396ns the lag time that the switch mosfet pipe lags behind the conducting of IGBT switching tube.
Like this, in the opening process of IGBT switching tube, after the complete conducting of switch mosfet pipe, open again the IGBT switching tube, thereby make the IGBT switching tube open-minded in the no-voltage situation.In the turn off process of IGBT switching tube, when closing to have no progeny fully, the IGBT switching tube closes again the switch mosfet pipe, and now because the conducting always of switch mosfet pipe realizes shunting action, thereby make the IGBT switching tube realize turn-offing with less hangover electric current.
Thereby above-mentioned control method has guaranteed the approximate soft switching characteristic that soft switching characteristic that the no-voltage of IGBT switching tube is opened and little electric current turn-off, given full play to again the current lead-through ability of switch mosfet pipe self.
In sum, the PFC transducer that the utility model provides, comprise rectifier bridge B1, inductance L 1, diode D1, input voltage detection circuit, input current testing circuit, output voltage detecting circuit and control circuit, drive circuit and the first switching tube unit VT1 and second switch pipe unit VT2, the first switching tube unit VT1 and second switch pipe unit VT2 adopt respectively the topological structure of IGBT and MOSFET parallel connection.In control method, the MOSFET of second switch pipe unit VT2 is turn-offed prior to the IGBT conducting of the first switching tube unit VT1, the IGBT that lags behind the first switching tube unit VT1, MOSFET is that IGBT creates the soft switch condition that no-voltage is opened (ZVS) and approached zero-current switching (ZCS), thereby greatly reduces the switching loss of IGBT; The passage of On current shunting is provided for IGBT again after the whole conductings of MOSFET, has reduced on the whole the conduction loss of switching tube.This method utilizes that the IGBT conduction loss is low, power MOSFET open the characteristic low with turn-off power loss, both advantages have been taken into account, both deficiencies have been overcome, make IGBT there is the approximate soft switching characteristic that soft switching characteristic that no-voltage opens and little electric current turn-off, improved power density, reduce switching loss, improved the efficiency of pfc circuit.
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, its technical scheme that still can put down in writing aforementioned each embodiment is modified or part technical characterictic wherein is equal to replacement.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. a PFC transducer, comprise rectifier bridge B1, inductance L 1, diode D1, input voltage detection circuit, input current testing circuit and output voltage detecting circuit, two inputs of described rectifier bridge B1 connect respectively live wire and the zero line of alternating current, the cathode output end of described rectifier bridge B1 connects the first end of described inductance L 1, the cathode output end of described rectifier bridge B1 connects the first end of described input current testing circuit, the negative pole end of the second termination DC bus of described input current testing circuit, described input voltage detection circuit just is being connected to described rectifier bridge B1, between cathode output end, the anode of the described diode D1 of the second termination of described inductance L 1, the negative electrode of described diode D1 connects the positive terminal of DC bus, described output voltage detecting circuit just is being connected to DC bus, between negative pole end, it is characterized in that, described PFC transducer also comprises:
The control circuit be connected with the output of the output of the output of described input voltage detection circuit, input current testing circuit and output voltage detecting circuit respectively; And
With the pwm control signal output of described control circuit, be connected, in order to drive the drive circuit of the first switching tube unit VT1 and second switch pipe unit VT2;
Wherein, described the first switching tube unit VT1 and described second switch pipe unit VT2 are connected in parallel between the negative pole end of the second end of described inductance L 1 and DC bus, described the first switching tube unit VT1 adopts the IGBT switching tube, and described second switch pipe unit VT2 adopts the switch mosfet pipe; The drain electrode of the collector electrode of described the first switching tube unit VT1 and described second switch pipe unit VT2 is connected on the second end of described inductance L 1 altogether, the source electrode of the emitter of described the first switching tube unit VT1 and described second switch pipe unit VT2 is connected on the negative pole end of described DC bus altogether, and the grid of the grid of described the first switching tube unit VT1 and described second switch pipe unit VT2 connects respectively the first output and second output of described drive circuit.
2. PFC transducer as claimed in claim 1, is characterized in that, described PFC transducer also comprises storage capacitor C1;
Described storage capacitor C1 is connected between described DC bus positive and negative extreme.
3. PFC transducer as claimed in claim 1, is characterized in that, described the first switching tube unit VT1 comprises the IGBT switching tube of two more parallels.
4. PFC transducer as claimed in claim 1, is characterized in that, described second switch pipe unit VT2 comprises the switch mosfet pipe of two more parallels.
5. PFC transducer as claimed in claim 1, it is characterized in that, described drive circuit comprises: resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, NPN type triode Q1, NPN type triode Q3, positive-negative-positive triode Q2, positive-negative-positive triode Q4, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3 and voltage-stabiliser tube ZD4;
The control signal PWM output of described control circuit connects the first end of described resistance R 1 and the first end of resistance R 2 simultaneously, the second end of described resistance R 1 connects the base stage of described NPN type triode Q1 and the base stage of positive-negative-positive triode Q2 simultaneously, the collector electrode of described NPN type triode Q1 meets positive supply+VCC, the emitter of described NPN type triode Q1 and the emitter of described positive-negative-positive triode Q2 are connected on the first end of described resistance R 3 altogether, the collector electrode of described positive-negative-positive triode Q2 meets negative supply-VEE, the first output that the second end of described resistance R 3 is described drive circuit, connect the grid of described the first switching tube unit VT1, described resistance R 4 is connected between second end and ground of described resistance R 3, the negative electrode of described voltage-stabiliser tube ZD1 connects the second end of described resistance R 3, the anode of described voltage-stabiliser tube ZD1 connects the anode of described voltage-stabiliser tube ZD2, the minus earth of described voltage-stabiliser tube ZD2,
The second end of described resistance R 2 connects the base stage of described NPN type triode Q3 and the base stage of positive-negative-positive triode Q4 simultaneously, the collector electrode of described NPN type triode Q3 meets described positive supply+VCC, the emitter of described NPN type triode Q3 and the emitter of described positive-negative-positive triode Q4 are connected on the first end of described resistance R 5 altogether, the collector electrode of described positive-negative-positive triode Q4 meets described negative supply-VEE, the second output that the second end of described resistance R 5 is described drive circuit, connect the grid of described second switch pipe unit VT2, described resistance R 6 is connected between second end and ground of described resistance R 5, the negative electrode of described voltage-stabiliser tube ZD3 connects the second end of described resistance R 5, the anode of described voltage-stabiliser tube ZD3 connects the anode of described voltage-stabiliser tube ZD4, the minus earth of described voltage-stabiliser tube ZD4.
6. PFC transducer as claimed in claim 5, is characterized in that, described resistance R 1 equates with the resistance of resistance R 2, and the resistance of described resistance R 4 and resistance R 6 equates, the resistance of described resistance R 3 is greater than the resistance of described resistance R 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320430579.6U CN203377786U (en) | 2013-07-17 | 2013-07-17 | A pfc converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320430579.6U CN203377786U (en) | 2013-07-17 | 2013-07-17 | A pfc converter |
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| CN203377786U true CN203377786U (en) | 2014-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320430579.6U Expired - Lifetime CN203377786U (en) | 2013-07-17 | 2013-07-17 | A pfc converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113210A (en) * | 2013-07-17 | 2014-10-22 | 广东美的制冷设备有限公司 | PFC converter and control method thereof |
| CN104811028A (en) * | 2014-01-23 | 2015-07-29 | 广东美的制冷设备有限公司 | Power factor correction circuit |
| CN106374746A (en) * | 2016-09-30 | 2017-02-01 | 河海大学常州校区 | Non-isolated three-level Buck converter and control method thereof |
| CN107040143A (en) * | 2017-06-12 | 2017-08-11 | 湖南晟和电子技术有限公司 | Power circuit, method of supplying power to and its measuring instrument being made |
-
2013
- 2013-07-17 CN CN201320430579.6U patent/CN203377786U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113210A (en) * | 2013-07-17 | 2014-10-22 | 广东美的制冷设备有限公司 | PFC converter and control method thereof |
| CN104811028A (en) * | 2014-01-23 | 2015-07-29 | 广东美的制冷设备有限公司 | Power factor correction circuit |
| CN106374746A (en) * | 2016-09-30 | 2017-02-01 | 河海大学常州校区 | Non-isolated three-level Buck converter and control method thereof |
| CN107040143A (en) * | 2017-06-12 | 2017-08-11 | 湖南晟和电子技术有限公司 | Power circuit, method of supplying power to and its measuring instrument being made |
| CN107040143B (en) * | 2017-06-12 | 2023-08-08 | 湖南晟和电源科技有限公司 | Power supply circuit, power supply method and metering instrument manufactured by same |
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