CN103812345B - A kind of Switching Power Supply - Google Patents
A kind of Switching Power Supply Download PDFInfo
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- CN103812345B CN103812345B CN201410025319.XA CN201410025319A CN103812345B CN 103812345 B CN103812345 B CN 103812345B CN 201410025319 A CN201410025319 A CN 201410025319A CN 103812345 B CN103812345 B CN 103812345B
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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
Abstract
The invention discloses a kind of Switching Power Supply, comprising: pfc circuit, for carrying out power factor correction and rectification to the alternating voltage of input, and by the direct voltage output of gained to DCDC translation circuit; DCDC translation circuit, carries out decompression transformation for the direct voltage exported pfc circuit; Pfc circuit control chip, for exporting the first control signal, to control unlatching or the closedown of the switching tube in pfc circuit; Asynchronous control circuit, the first control signal control DCDC translation circuit control chip for exporting according to pfc circuit control chip exports the second control signal, opens when closing the second control signal is opened for the switching tube of the switching tube in control DCDC translation circuit in pfc circuit or close for the switching tube of the switching tube in control DCDC translation circuit in pfc circuit.The present invention can reduce the cost of Switching Power Supply, improves its reliability.
Description
Technical field
The present invention relates to power technique fields, particularly relate to a kind of Switching Power Supply.
Background technology
Switching Power Supply utilizes modern power electronics technology, the time ratio that control switch pipe turns on and off, and maintains a kind of power supply of regulated output voltage.In order to improve power factor, avoiding harmonic pollution, in Switching Power Supply, being usually provided with prime PFC(PowerFactorCorrection, power factor correction) circuit and rear class DCDC(DC-to-DC) translation circuit, jointly to have carried out power conversion.
During Switching Power Supply work, the switching tube in pfc circuit is closed, energy injection, in energy storage capacitor, the switching tube in pfc circuit is opened, stops stored energy in energy storage capacitor; When switching tube in DCDC translation circuit is opened, absorb energy from energy storage capacitor, when the switching tube in DCDC translation circuit is closed, stop absorbing energy from energy storage capacitor.
Existing Switching Power Supply Problems existing is: be random by energy injection to moment of energy storage capacitor and DCDC translation circuit from the moment that energy storage capacitor absorbs energy due to pfc circuit, uncontrollable, and DCDC translation circuit needs to absorb energy from energy storage capacitor completely, therefore the capacity of energy storage capacitor needs enough large, the requirement absorbed energy of DCDC translation circuit and the requirement of secondary output low-ripple voltage could be met, and in Switching Power Supply, be equipped with jumbo energy storage capacitor, the cost of Switching Power Supply can be caused greatly to increase; On the other hand, jumbo energy storage capacitor many uses electrolytic capacitor, its useful life generally only has several thousand hours, reduces the reliability of Switching Power Supply.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of Switching Power Supply, to solve the technical problem that prior art breaker in middle power supply cost is high and reliability is low.
A kind of Switching Power Supply that the embodiment of the present invention provides, comprising:
Power factor correction pfc circuit, DC-to-DC DCDC translation circuit, power factor correction pfc circuit control chip, DC-to-DC DCDC translation circuit control chip and asynchronous control circuit, wherein,
Described pfc circuit is used for carrying out power factor correction and rectification to the alternating voltage of input, and gives described DCDC translation circuit by the direct voltage output of gained;
Described DCDC translation circuit is used for carrying out decompression transformation to the direct voltage that described pfc circuit exports;
Described pfc circuit control chip is connected with the switching tube in described pfc circuit, for exporting the first control signal, to control unlatching or the closedown of the switching tube in described pfc circuit;
Described asynchronous control circuit is connected with described DCDC translation circuit control chip with described pfc circuit control chip, the first control signal for exporting according to described pfc circuit control chip controls described DCDC translation circuit control chip and exports the second control signal, close described second control signal is opened for the switching tube of switching tube in described pfc circuit controlled in described DCDC translation circuit, or open when closing for the switching tube of switching tube in described pfc circuit controlled in described DCDC translation circuit.
Further, described asynchronous control circuit comprises: the first control unit and the 3rd control signal generation unit, wherein,
Described first control unit is used for the first control signal exported according to described pfc circuit control chip, and the reference voltage controlling the output of described DCDC translation circuit control chip is input to described 3rd control signal generation unit;
Described 3rd control signal generation unit is used for generating the 3rd control signal according to the described reference voltage of input, and the 3rd control signal generated is input to described DCDC translation circuit control chip, export described second control signal to control described DCDC translation circuit control chip.
Further, described first control unit comprises: the first diode, first PNP triode, first capacitor, first resistance and the second resistance, wherein, the negative electrode of described first diode is connected with described pfc circuit control chip, the anode of described first diode is connected with one end of described first resistance, the other end of described first resistance is connected with the base stage of one end of described second resistance and described first PNP triode, the emitter of described first PNP triode and the other end of described second resistance, the positive plate of described first capacitor is connected with described DCDC translation circuit control chip, the collector electrode of described first PNP triode is connected with described 3rd control signal generation unit, the negative plate ground connection of described first capacitor,
Described 3rd control signal generation unit comprises: the second capacitor, the 3rd resistance and the 4th resistance, wherein, one end of described 3rd resistance is connected with the collector electrode of described first PNP triode, the other end of described 3rd resistance is connected with one end of the negative plate of described second capacitor and described 4th resistance, the other end ground connection of described 4th resistance, the positive plate of described second capacitor is connected with described DCDC translation circuit control chip.
Further, the first pin ground connection of described pfc circuit control chip, the second pin is by the 5th grounding through resistance, and the 7th pin connects the first power supply, and negative electrode and the described pfc circuit of the 8th pin and the first diode of described asynchronous control circuit are connected.
Further, 4th pin of described DCDC translation circuit control chip is connected with the positive plate of the second capacitor of described asynchronous control circuit, 5th pin ground connection, 6th pin is connected with described DCDC translation circuit, 7th pin connects described first power supply, and the 8th pin is connected with the emitter of the first PNP triode of described asynchronous control circuit.
Further, described pfc circuit comprises: the bridge rectifier be made up of four the second diodes, the 3rd diode, the 4th diode, the 5th diode, the 3rd capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor, the 6th resistance, the 7th resistance, the first NMOS tube and the first inductor, wherein, described 3rd diode is voltage stabilizing didoe;
First input end of described pfc circuit is connected with the first terminal of described bridge rectifier, second input terminal of described pfc circuit is connected with the 3rd terminal of described bridge rectifier, second terminal ground of described bridge rectifier, 4th terminal of described bridge rectifier is connected with one end of the positive plate of described 3rd capacitor and described 6th resistance, the negative plate ground connection of described 3rd capacitor, the other end of described 6th resistance is connected with the negative electrode of the positive plate of described 4th capacitor and described 3rd diode, the negative plate of described 4th capacitor and the plus earth of described 3rd diode, the negative electrode of described 3rd diode and the negative electrode of described 4th diode connect described first power supply, the anode of described 4th diode is connected with one end of the auxiliary winding of described first inductor, the other end of the auxiliary winding of described first inductor and the negative plate ground connection of described 5th capacitor, the positive plate of described 5th capacitor is connected with the negative electrode of described 4th diode, one end of described first inductor is connected with the positive plate of described 3rd capacitor, the other end of described first inductor is connected with the anode of the drain electrode of described first NMOS tube and described 5th diode, the negative electrode of described 5th diode is connected with the positive plate of described 6th capacitor and described DCDC translation circuit, the negative plate ground connection of described 6th capacitor, the source ground of described first NMOS tube, the grid of described first NMOS tube is connected with one end of described 7th resistance, the other end of described 7th resistance is connected with the 8th pin of described pfc circuit control chip.
Further, described DCDC translation circuit comprises: the 6th diode, the 7th capacitor, the 8th resistance, the second NMOS tube and the first transformer;
One end of the primary coil of described first transformer is connected with the negative electrode of the 5th diode of described pfc circuit, the other end of the primary coil of described first transformer is connected with the drain electrode of described second NMOS tube, one end of the secondary coil of described first transformer is connected with the anode of described 6th diode, the other end of the secondary coil of described first transformer is connected with the negative plate of described 7th capacitor, the negative plate of described 7th capacitor connects secondaryly, the negative electrode of described 6th diode and the positive plate of described 7th capacitor connect second source, the source ground of described second NMOS tube, the grid of described second NMOS tube is connected with one end of described 8th resistance, the other end of described 8th resistance is connected with the 6th pin of described DCDC translation circuit control chip.
The Switching Power Supply that the embodiment of the present invention provides, by arranging asynchronous control circuit between pfc circuit control chip and DCDC translation circuit control chip, second control signal of the switching tube for control DCDC translation circuit of the first control signal control DCDC translation circuit control chip output of the switching tube for controlling pfc circuit that this asynchronous control circuit exports according to pfc circuit control chip, when the switching tube that can realize pfc circuit is closed, the switching tube of DCDC translation circuit is opened, the energy of pfc circuit release is directly delivered to DCDC translation circuit, avoid the reciprocation cycle of energy at the energy storage capacitor of pfc circuit, the capacity of energy storage capacitor can be reduced like this, thus reduce the cost of Switching Power Supply, improve its reliability.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the structured flowchart of a kind of Switching Power Supply that the embodiment of the present invention provides;
Fig. 2 is the circuit diagram of the another kind of Switching Power Supply that the embodiment of the present invention provides.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content.
Fig. 1 is the structured flowchart of a kind of Switching Power Supply that the embodiment of the present invention provides.As shown in Figure 1, described Switching Power Supply comprises: pfc circuit 11, DCDC translation circuit 12, pfc circuit control chip 13, DCDC translation circuit control chip 14 and asynchronous control circuit 15, wherein, the direct voltage output of gained for carrying out power factor correction and rectification to the alternating voltage of input, and is given described DCDC translation circuit 12 by described pfc circuit 11; Described DCDC translation circuit 12 carries out decompression transformation for the direct voltage exported described pfc circuit 11; Described pfc circuit control chip 12 is connected with the switching tube in described pfc circuit 11, for exporting the first control signal, to control unlatching or the closedown of the switching tube in described pfc circuit 11; Described asynchronous control circuit 15 is connected with described DCDC translation circuit control chip 14 with described pfc circuit control chip 13, the first control signal for exporting according to described pfc circuit control chip 13 controls described DCDC translation circuit control chip 14 and exports the second control signal, close described second control signal is opened for the switching tube of switching tube in described pfc circuit 11 controlled in described DCDC translation circuit 12, or open when closing for the switching tube of switching tube in described pfc circuit 11 controlled in described DCDC translation circuit 12.
It should be noted that, the first control signal that pfc circuit control chip 13 exports can be high level, also can be low level; Similarly, the second control signal that described DCDC translation circuit control chip 14 exports can be high level, also can be low level.Switching tube is opened or closes, not only relevant with control signal, but also relevant with the kind of selected switching tube.
When the first control signal that pfc circuit control chip 13 exports makes the switching tube of pfc circuit 11 open, now asynchronous control circuit 15 controls DCDC translation circuit control chip 14 according to the first control signal, and the second control signal that DCDC translation circuit control chip 14 exports makes the switching tube of DCDC translation circuit 12 close, when the first control signal that pfc circuit control chip 13 exports makes the switching tube of pfc circuit 11 close, now asynchronous control circuit 15 controls DCDC translation circuit control chip 14 according to the first control signal, the second control signal that DCDC translation circuit control chip 14 exports makes the switching tube of DCDC translation circuit 12 open, thus the unlatching or close that achieves the switching tube of pfc circuit 11 is associated with the unlatching of the switching tube of DCDC translation circuit 12 or closedown, and the opening and closing of two switching tubes are nonsynchronous, namely " asynchronous " described in asynchronous control circuit.Therefore, when the switching tube of pfc circuit 11 is closed, the switching tube of DCDC translation circuit 12 can be opened and absorb energy from the energy storage capacitor of pfc circuit 11, the energy of such pfc circuit 11 will be directly delivered to DCDC translation circuit 12, energy passes through energy storage capacitor without repetitive cycling, the capacity of energy storage capacitor can be reduced, reduce the cost of Switching Power Supply, improve its reliability.
Alternatively, asynchronous control circuit comprises: the first control unit and the 3rd control signal generation unit, wherein, described first control unit is used for the first control signal exported according to described pfc circuit control chip, and the reference voltage controlling the output of described DCDC translation circuit control chip is input to described 3rd control signal generation unit; Described 3rd control signal generation unit is used for generating the 3rd control signal according to the described reference voltage of input, and the 3rd control signal generated is input to described DCDC translation circuit control chip, export described second control signal to control described DCDC translation circuit control chip.
Fig. 2 is the circuit diagram of the another kind of Switching Power Supply that the embodiment of the present invention provides.Alternatively, see Fig. 2, first control unit 151 of asynchronous control circuit 15 comprises: the first diode D1, first PNP triode Q1, first capacitor C1, first resistance R1 and the second resistance R2, wherein, the negative electrode of described first diode D1 is connected with described pfc circuit control chip 13, the anode of described first diode D1 is connected with one end of described first resistance R1, the other end of described first resistance R1 is connected with one end of described second resistance R2 and the base stage of described first PNP triode Q1, the emitter of described first PNP triode Q1 and the other end of described second resistance R2, the C1 positive plate of described first capacitor is connected with described DCDC translation circuit control chip 14, the collector electrode of described first PNP triode Q1 is connected with the 3rd control signal generation unit 152 of described asynchronous control circuit 15, the negative plate ground connection of described first capacitor C1, 3rd control signal generation unit 152 of asynchronous control circuit 15 comprises: the second capacitor C2, the 3rd resistance R3 and the 4th resistance R4, wherein, one end of described 3rd resistance R3 is connected with the collector electrode of described first PNP triode Q1, the other end of described 3rd resistance R3 is connected with one end of the negative plate of described second capacitor C2 and described 4th resistance R4, the other end ground connection of described 4th resistance R4, the positive plate of described second capacitor C2 is connected with described DCDC translation circuit control chip 14.
It should be noted that, the first control signal exported by pfc circuit control chip 13 can the unlatching of the first PNP triode Q1 in the first control unit 151 of control DCDC translation circuit control chip 14 or closedown, thus whether the reference voltage realizing the output of control DCDC translation circuit control chip 14 is sent to the 3rd control signal generation unit 152, correspondingly, the 3rd control signal is produced at the positive plate of the second capacitor C2 of the 3rd control signal generation unit 152, and the 3rd control signal is input to DCDC translation circuit control chip 14, the second control signal is exported with control DCDC translation circuit control chip 14.
Alternatively, see Fig. 2, first pin Gnd ground connection of pfc circuit control chip 13, second pin Freq is by the 5th resistance R5 ground connection, 7th pin Vcc meets the first power supply VCC1, and negative electrode and the described pfc circuit 11 of the 8th pin Gate and the first diode D1 of described asynchronous control circuit 15 are connected.
It should be noted that, three-prong Isns, the 4th pin Ovp, the 5th pin Comp of pfc circuit control chip 13 need to be connected with other outside circuit with the 6th pin Vfb.In addition, pfc circuit control chip 13 can adopt model to be the chip of IR1150, also can adopt the chip of other model.When pfc circuit control chip 13 normally works, the 8th pin Gate and PWM(PulseWidthModulation, pulse width modulation) output pin is the output pin of the first control signal.
Alternatively, see Fig. 2,4th pin RCTC of DCDC translation circuit control chip 14 is connected with the positive plate of the second capacitor C2 of described asynchronous control circuit 15,5th pin GND ground connection, 6th pin OUT is connected with described DCDC translation circuit 12,7th pin VCC meets described first power supply VCC1, and the 8th pin VRF is connected with the emitter of the first PNP triode Q1 of described asynchronous control circuit 15.
It should be noted that, the first pin COM, the second pin FB and the three-prong IS of DCDC translation circuit control chip 14 need to be connected with other outside circuit.In addition, DCDC translation circuit control chip 14 can adopt model to be the chip of UC2845, also can adopt the chip of other model.When DCDC translation circuit control chip 14 normally works, its 8th pin VRF exports the voltage of+5 volts as reference voltage, and namely the 8th pin VRF is the output pin of the reference voltage of DCDC translation circuit control chip 14; In addition, the 4th pin RCTC is the input pin of the 3rd control signal, and the 6th pin OUT is the output pin of the second control signal.
Alternatively, see Fig. 2, pfc circuit 11 comprises: the bridge rectifier (in fig. 2 around the part that the dotted line frame of four the second diode D2 surrounds) be made up of four the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 3rd capacitor C3, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6, the 6th resistance R6, the 7th resistance R7, the first NMOS tube Q2 and the first inductor L1, wherein, described 3rd diode D3 is voltage stabilizing didoe, the sub-IP1 of first input end of described pfc circuit 11 is connected with the first terminal A1 of described bridge rectifier, second input terminal IP2 of described pfc circuit is connected with the 3rd terminal A3 of described bridge rectifier, second terminal A2 ground connection of described bridge rectifier, 4th terminal A4 of described bridge rectifier is connected with one end of the positive plate of described 3rd capacitor C3 and described 6th resistance R6, the negative plate ground connection of described 3rd capacitor C3, the other end of described 6th resistance R6 is connected with the negative electrode of the positive plate of described 4th capacitor C4 and described 3rd diode D3, the negative plate of described 4th capacitor C4 and the plus earth of described 3rd diode D3, the negative electrode of described 3rd diode D3 and the negative electrode of described 4th diode D4 meet described first power supply VCC1, the anode of described 4th diode D4 is connected with one end of the auxiliary winding of described first inductor L1, the other end of the auxiliary winding of described first inductor L1 and the negative plate ground connection of described 5th capacitor C5, the positive plate of described 5th capacitor C5 is connected with the negative electrode of described 4th diode D2, one end of described first inductor L1 is connected with the positive plate of described 3rd capacitor C3, the other end of described first inductor L1 is connected with the anode of the drain electrode of described first NMOS tube Q2 and described 5th diode D5, the negative electrode of described 5th diode D5 is connected with the positive plate of described 6th capacitor C6 and described DCDC translation circuit 12, the negative plate ground connection of described 6th capacitor C6, the source ground of described first NMOS tube Q2, the grid of described first NMOS tube Q2 is connected with one end of described 7th resistance R7, the other end of described 7th resistance R7 is connected with the 8th pin Gate of described pfc circuit control chip 13.
It should be noted that, the first NMOS tube Q2 is the switching tube of pfc circuit 11, and the 6th capacitor C6 is the energy storage capacitor of pfc circuit 11.When pfc circuit control chip 13 exports high level, this high level is applied to the grid of the first NMOS tube Q2, and the first NMOS tube Q2 opens, thus by the 5th diode D5 and the 6th capacitor C6 short circuit, alternating voltage is applied on the first inductor L1, the first inductor L1 storage power; When pfc circuit control chip 13 output low level, this low level is applied to the grid of the first NMOS tube Q2, first NMOS tube Q2 closes, but the 5th diode D5 conducting, the energy that first inductor L1 stores is delivered to the 6th capacitor C6 by the 5th diode D5, and stores energy in the 6th capacitor C6.About the specific works principle of pfc circuit, be well known to those skilled in the art, do not repeat them here.
Alternatively, comprise see Fig. 2, DCDC translation circuit 12: the 6th diode D6, the 7th capacitor C7, the 8th resistance R8, the second NMOS tube Q3 and the first transformer T1, one end of the primary coil of described first transformer T1 is connected with the negative electrode of the 5th diode D5 of described pfc circuit 11, the other end of the primary coil of described first transformer T1 is connected with the drain electrode of described second NMOS tube Q3, one end of the secondary coil of described first transformer T1 is connected with the anode of described 6th diode D6, the other end of the secondary coil of described first transformer T1 is connected with the negative plate of described 7th capacitor C7, the negative plate of described 7th capacitor C7 connects secondaryly, the negative electrode of described 6th diode D6 and the positive plate of described 7th capacitor C7 meet second source Vo, the source ground of described second NMOS tube Q3, the grid of described second NMOS tube Q3 is connected with one end of described 8th resistance R8, the other end of described 8th resistance R8 is connected with the 6th pin OUT of described DCDC translation circuit control chip 14.
It should be noted that, the second NMOS tube Q3 is the switching tube of DCDC translation circuit 12, and the 7th capacitor C7 is the energy storage capacitor of DCDC translation circuit 12.When DCDC translation circuit control chip 14 exports high level, this high level is applied to the grid of the second NMOS tube Q3, second NMOS tube Q3 opens, the primary coil of the first transformer T1 is connected to ground by the second NMOS tube Q3 and forms loop, the primary coil of the first transformer T1 starts to absorb energy from the 6th capacitor C6 of pfc circuit 11, again through the decompression transformation of the first transformer T1, by energy storage corresponding for the low-voltage of gained in the 7th capacitor C7, and by the 7th capacitor C7 externally circuit direct voltage is provided; When DCDC translation circuit control chip 14 output low level, this low level is applied to the grid of the second NMOS tube Q3, and the second NMOS tube Q3 closes, and the primary coil of the first transformer T1 stops absorbing energy from the 6th capacitor C6 of pfc circuit 11.
Do referring to the operation principle of Fig. 2 to asynchronous control circuit and describe further.Switching Power Supply is in normal operating conditions, and when the 8th pin Gate of pfc circuit control chip 13 exports high level, the first NMOS tube Q2 conducting, alternating voltage is added on the first inductor L1, the first inductor L1 storage power.Now due to the acting in opposition of the first diode D1, the high level signal that the 8th pin Gate of pfc circuit control chip 13 exports can not be delivered to asynchronous control circuit 15; DCDC translation circuit control chip 14 its 8th pin VRF when normal work exports+5 volt high level as reference voltage, and draws as high level by the second resistance R2 by the base stage of the first PNP triode Q1, and the first PNP triode Q1 will be in closed condition.Now, 3rd resistance R3 does not have electric current to pass through, the energy that second capacitor C2 stores discharges the voltage drop on the second capacitor C2 by the inside of the 4th resistance R4 and DCDC translation circuit control chip 14, the oscillator synchronization of DCDC translation circuit control chip 14 is made to start and be in the trailing edge of triangular wave, according to the feature of DCDC translation circuit control chip 14, its the 6th pin OUT starts output low level, and the second NMOS tube Q3 is in closed condition.
When the 8th pin Gate output low level of pfc circuit control chip 13, the first NMOS tube Q2 closes, the 5th diode D5 conducting, and the energy that the first inductor L1 stores is delivered to the 6th capacitor C6 by the 5th diode D5.Meanwhile, the ground level of the first PNP triode Q1 will draw as low level by the first diode D1 and the first resistance R1 by the 8th pin Gate of pfc circuit control chip 13, first PNP triode Q1 conducting, + 5 volt high level that 8th pin VRF of DCDC translation circuit control chip 14 exports are added on the second capacitor C2 as reference voltage by the 3rd resistance R3, second capacitor C2 is in charged state, the oscillator synchronization of DCDC translation circuit control chip 14 is made to start and be in the rising edge of triangular wave, according to the feature of DCDC translation circuit control chip 14, its the 6th pin OUT starts to export high level, second NMOS tube Q3 is in opening, the primary coil of the first transformer T1 starts to absorb energy.And now the first inductor L1 of pfc circuit 11 just starts to release energy, energy is directly delivered on the first transformer T1, avoids energy repetitive cycling by the 6th capacitor C6, can reduce the capacity of the 6th capacitor C6, reduce the cost of Switching Power Supply, improve its reliability.
The Switching Power Supply that the embodiment of the present invention provides, by arranging asynchronous control circuit between pfc circuit control chip and DCDC translation circuit control chip, second control signal of the switching tube for control DCDC translation circuit of the first control signal control DCDC translation circuit control chip output of the switching tube for controlling pfc circuit that this asynchronous control circuit exports according to pfc circuit control chip, when the switching tube that can realize pfc circuit is closed, the switching tube of DCDC translation circuit is opened, the energy of pfc circuit release is directly delivered to DCDC translation circuit, avoid the reciprocation cycle of energy at the energy storage capacitor of pfc circuit, the capacity of energy storage capacitor can be reduced like this, thus reduce the cost of Switching Power Supply, improve its reliability.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (7)
1. a Switching Power Supply, is characterized in that, comprising:
Power factor correction pfc circuit, DC-to-DC DCDC translation circuit, power factor correction pfc circuit control chip, DC-to-DC DCDC translation circuit control chip and asynchronous control circuit, wherein,
Described pfc circuit is used for carrying out power factor correction and rectification to the alternating voltage of input, and gives described DCDC translation circuit by the direct voltage output of gained;
Described DCDC translation circuit is used for carrying out decompression transformation to the direct voltage that described pfc circuit exports;
Described pfc circuit control chip is connected with the switching tube in described pfc circuit, for exporting the first control signal, to control unlatching or the closedown of the switching tube in described pfc circuit;
Described asynchronous control circuit is connected with described DCDC translation circuit control chip with described pfc circuit control chip, the first control signal for exporting according to described pfc circuit control chip controls described DCDC translation circuit control chip and exports the second control signal, close described second control signal is opened for the switching tube of switching tube in described pfc circuit controlled in described DCDC translation circuit, or open when closing for the switching tube of switching tube in described pfc circuit controlled in described DCDC translation circuit.
2. Switching Power Supply according to claim 1, is characterized in that, described asynchronous control circuit comprises: the first control unit and the 3rd control signal generation unit, wherein,
Described first control unit is used for the first control signal exported according to described pfc circuit control chip, and the reference voltage controlling the output of described DCDC translation circuit control chip is input to described 3rd control signal generation unit;
Described 3rd control signal generation unit is used for generating the 3rd control signal according to the described reference voltage of input, and the 3rd control signal generated is input to described DCDC translation circuit control chip, export described second control signal to control described DCDC translation circuit control chip.
3. Switching Power Supply according to claim 2, it is characterized in that, described first control unit comprises: the first diode, first PNP triode, first capacitor, first resistance and the second resistance, wherein, the negative electrode of described first diode is connected with described pfc circuit control chip, the anode of described first diode is connected with one end of described first resistance, the other end of described first resistance is connected with the base stage of one end of described second resistance and described first PNP triode, the emitter of described first PNP triode and the other end of described second resistance, the positive plate of described first capacitor is connected with described DCDC translation circuit control chip, the collector electrode of described first PNP triode is connected with described 3rd control signal generation unit, the negative plate ground connection of described first capacitor,
Described 3rd control signal generation unit comprises: the second capacitor, the 3rd resistance and the 4th resistance, wherein, one end of described 3rd resistance is connected with the collector electrode of described first PNP triode, the other end of described 3rd resistance is connected with one end of the negative plate of described second capacitor and described 4th resistance, the other end ground connection of described 4th resistance, the positive plate of described second capacitor is connected with described DCDC translation circuit control chip.
4. Switching Power Supply according to claim 3, it is characterized in that, the model of described pfc circuit control chip is IR1150, first pin ground connection of described pfc circuit control chip, second pin is by the 5th grounding through resistance, 7th pin connects the first power supply, and negative electrode and the described pfc circuit of the 8th pin and the first diode of described asynchronous control circuit are connected.
5. Switching Power Supply according to claim 4, it is characterized in that, the model of described DCDC translation circuit control chip is UC2845,4th pin of described DCDC translation circuit control chip is connected with the positive plate of the second capacitor of described asynchronous control circuit, 5th pin ground connection, 6th pin is connected with described DCDC translation circuit, and the 7th pin connects described first power supply, and the 8th pin is connected with the emitter of the first PNP triode of described asynchronous control circuit.
6. Switching Power Supply according to claim 5, it is characterized in that, described pfc circuit comprises: the bridge rectifier be made up of four the second diodes, the 3rd diode, the 4th diode, the 5th diode, the 3rd capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor, the 6th resistance, the 7th resistance, the first NMOS tube and the first inductor, wherein, described 3rd diode is voltage stabilizing didoe;
First input end of described pfc circuit is connected with the first terminal of described bridge rectifier, second input terminal of described pfc circuit is connected with the 3rd terminal of described bridge rectifier, second terminal ground of described bridge rectifier, 4th terminal of described bridge rectifier is connected with one end of the positive plate of described 3rd capacitor and described 6th resistance, the negative plate ground connection of described 3rd capacitor, the other end of described 6th resistance is connected with the negative electrode of the positive plate of described 4th capacitor and described 3rd diode, the negative plate of described 4th capacitor and the plus earth of described 3rd diode, the negative electrode of described 3rd diode and the negative electrode of described 4th diode connect described first power supply, the anode of described 4th diode is connected with one end of the auxiliary winding of described first inductor, the other end of the auxiliary winding of described first inductor and the negative plate ground connection of described 5th capacitor, the positive plate of described 5th capacitor is connected with the negative electrode of described 4th diode, one end of described first inductor is connected with the positive plate of described 3rd capacitor, the other end of described first inductor is connected with the anode of the drain electrode of described first NMOS tube and described 5th diode, the negative electrode of described 5th diode is connected with the positive plate of described 6th capacitor and described DCDC translation circuit, the negative plate ground connection of described 6th capacitor, the source ground of described first NMOS tube, the grid of described first NMOS tube is connected with one end of described 7th resistance, the other end of described 7th resistance is connected with the 8th pin of described pfc circuit control chip.
7. Switching Power Supply according to claim 6, is characterized in that, described DCDC translation circuit comprises: the 6th diode, the 7th capacitor, the 8th resistance, the second NMOS tube and the first transformer;
One end of the primary coil of described first transformer is connected with the negative electrode of the 5th diode of described pfc circuit, the other end of the primary coil of described first transformer is connected with the drain electrode of described second NMOS tube, one end of the secondary coil of described first transformer is connected with the anode of described 6th diode, the other end of the secondary coil of described first transformer is connected with the negative plate of described 7th capacitor, the negative plate of described 7th capacitor connects secondaryly, the negative electrode of described 6th diode and the positive plate of described 7th capacitor connect second source, the source ground of described second NMOS tube, the grid of described second NMOS tube is connected with one end of described 8th resistance, the other end of described 8th resistance is connected with the 6th pin of described DCDC translation circuit control chip.
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| CN103259397A (en) * | 2012-02-17 | 2013-08-21 | Tdk株式会社 | Switching power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4193755B2 (en) * | 2004-06-04 | 2008-12-10 | サンケン電気株式会社 | Switching power supply device and power factor correction circuit |
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| JPH08289550A (en) * | 1995-04-12 | 1996-11-01 | Nec Corp | Power source system |
| CN1421986A (en) * | 2001-11-29 | 2003-06-04 | 三垦电气株式会社 | Switch type power source |
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