CN103683919B - High-power-factor low-harmonic-distortconstant constant current circuit and device - Google Patents

High-power-factor low-harmonic-distortconstant constant current circuit and device Download PDF

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CN103683919B
CN103683919B CN201310662590.XA CN201310662590A CN103683919B CN 103683919 B CN103683919 B CN 103683919B CN 201310662590 A CN201310662590 A CN 201310662590A CN 103683919 B CN103683919 B CN 103683919B
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inductance
diode
connects
circuit
current
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CN103683919A (en
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蔡拥军
叶美盼
汪丞辉
谢小高
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Hangzhou Silan Microelectronics Co Ltd
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Hangzhou Silan Microelectronics Co Ltd
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Abstract

The invention provides a kind of High-power-factor low-harmonic-distortconstant constant current circuit and device, this circuit includes front stage circuits and the late-class circuit intercoupled, and wherein, this front stage circuits is the step-up/step-down circuit for realizing PFC;This late-class circuit is the reduction voltage circuit for DC conversion, and this front stage circuits and late-class circuit share same switching tube and bus capacitor.The present invention is compared with two-layer configuration, and device is less, and cost is lower;Compared with single-stage buck type structure, output load current ripple is less, and the present invention has higher power factor and lower total harmonic distortion.

Description

High-power-factor low-harmonic-distortconstant constant current circuit and device
Technical field
The present invention relates to switch power technology, particularly relate to a kind of High-power-factor low-harmonic-distortconstant constant current circuit And device.
Background technology
At present, owing to most of electrical equipments existing non-linear element and energy-storage travelling wave tube so that input AC Current waveform can occur Severe distortion, and net side input power factor is the lowest, in order to meet international standard The harmonic requirement of IEC61000-3-2, it is necessary to add Active PFC (PFC) in these electrical equipments Device.
In order to solve the problem of low power factor, single-stage or two stage power factor correcting (PFC) circuit engineering are It is widely used in AC-DC power converter.
Two stage power factor correcting technology has relative to single-level power factor correction technology that output ripple is little, merit The feature that rate factor is high, thus be widely used in circuit of power factor correction, its basic theory diagram As shown in Figure 1.It is input to first order power factor correcting converter after input ac voltage rectified bridge rectification 101, first order power factor correcting converter 101 generally serves to realize APFC, common Topology have boosting (Boost), buck (Buck-boost) and blood pressure lowering (Buck) structure.Due to Input current input voltage waveform to be followed changes, thus input power is the power of pulsation, therefore in the first order A great Rong is generally had between power factor correcting converter 101 and second level DC-DC converter 102 Amount storage capacitor Cbulk, in order to balance the ac input power of pulsation and stable DC output power.Second Level DC-DC converter 102 can realize effective adjustment to the voltage of output or electric current.But, at Fig. 1 In shown structure, owing to there is two stage power circuit, control circuit is also required to two parts of correspondence, increases The complexity of circuit, and cost is of a relatively high, be lost bigger.
Fig. 2 shows voltage-dropping type (Buck) the pfc circuit structure of a kind of single-stage of the prior art, bag Include: rectifier bridge 201, receive input signal Vac;Input capacitance Cin, it is connected to two of rectifier bridge 201 Between outfan;Diode Do, its negative electrode connects the positive output end of rectifier bridge 201, and its anode connects switching tube First power end of Q1;Output capacitance Co, the positive output end of its first termination rectifier bridge 201, it is second years old Second end of termination inductance L;Inductance L, first power end of its first end connecting valve pipe Q1, it is years old Two ends connect output capacitance CoThe second end;Switching tube Q1, its first power terminations diode DoSun Pole and first end of inductance L, its second power terminations sampling resistor RsThe first end, its control termination perseverance The outfan PWM of flow control driver 202;Sampling resistor Rs, the of its first termination switching tube Q1 The current sample end CS of two power end and current constant control driver 202, its second termination rectifier bridge 201 Negative output terminal and the ground end GND of current constant control driver 202.
Single-stage buck type pfc circuit as a example by Fig. 2, although circuit structure is simple, and circuit cost is low, But shortcoming is output loading exists bigger ripple current (the usually ripple current of 100Hz), can cause Stroboscopic, it is impossible to be applicable to some application scenario higher to stroboscopic requirement.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of High-power-factor low-harmonic-distortconstant constant current circuit and Device, can reduce circuit cost for comparing traditional two-stage circuit, for comparing traditional single-level circuit The ripple current of load can be reduced.
For solving above-mentioned technical problem, the invention provides a kind of High Power Factor low harmonics distortion Constant Electric Current Road, including the front stage circuits intercoupled and late-class circuit, wherein,
This front stage circuits is the step-up/step-down circuit for realizing PFC;
This late-class circuit is the reduction voltage circuit for DC-dc conversion, and this front stage circuits and rear class electricity Road shares same switching tube and bus capacitor.
According to one embodiment of present invention, described front stage circuits includes:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its anode connects the first end of described input capacitance;
Second diode, its negative electrode connects the negative electrode of described first diode;
First inductance, its first end connects described first diode and the negative electrode of the second diode;
Described bus capacitor, its first end connects the second end of described first inductance, and its second end connects described The anode of the second diode;
Described switching tube, its first power end connects the second end of described first inductance and described bus capacitor First end, its second power end connects the second end of described input capacitance, and it controls the driving outside end reception Signal;
Described late-class circuit includes:
Described bus capacitor;
Described switching tube;
3rd diode, its negative electrode connects the second end of described bus capacitor;
4th diode, its negative electrode connects the second power end of described switching tube, and its anode connects the described 3rd The anode of diode;
Sampling resistor, its first end connects the second power end of described switching tube;
Second inductance, its first end connects the second end of described sampling resistor, the second end of described second inductance With the anode of described 3rd diode as load access interface.
According to one embodiment of present invention, described late-class circuit also includes: output loading, and its first end is even Connecing the second end of described second inductance, its second end connects the anode and the described 4th of described 3rd diode The anode of diode, described output loading be output capacitance, load or output capacitance in parallel with load in Any one.
According to one embodiment of present invention, during the conducting of described switching tube, the signal circuit of described front stage circuits For: the signal of described positive input terminal is the most described via the transmission of described first diode, the first inductance and switching tube Negative input end, the signal circuit of described late-class circuit is: the signal of the first end of described bus capacitor is via institute State switching tube, sampling resistor, the second inductance, output loading and the transmission of the 3rd diode to described bus capacitor The second end;When described switching tube disconnects, the signal circuit of described front stage circuits is: flow through described first electricity The electric current of sense is back to described first inductance via described bus capacitor and the second diode continuousing flow;Described rear class The signal circuit of circuit is: flow through the electric current of described second inductance via described output loading, the 4th diode And sampling resistor afterflow is back to described second inductance.
According to one embodiment of present invention, described front stage circuits includes:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its anode connects the first end of described input capacitance;
Second diode, its negative electrode connects the negative electrode of described first diode;
First inductance, its first end connects described first diode and the negative electrode of the second diode;
Described bus capacitor, its first end connects the second end of described first inductance, and its second end connects described The anode of the second diode;
Described switching tube, its first power end connects the second end of described first inductance and described bus capacitor First end, it controls the driving signal outside end reception;
Peak value sampling resistance, its first end connects the second power end of described switching tube, and its second end connects institute State the second end of input capacitance;
Described late-class circuit includes:
Described bus capacitor;
Described switching tube;
Described peak value sampling resistance;
3rd diode, its negative electrode connects the second end of described bus capacitor;
4th diode, its negative electrode connects the second end of described peak value sampling resistance, and its anode connects described the The anode of three diodes;
Sampling resistor, its first end connects the second end of described peak value sampling resistance;
Second inductance, its first end connects the second end of described sampling resistor, the second end of described second inductance And the anode of described 3rd diode is as load access interface.
According to one embodiment of present invention, described late-class circuit also includes: output loading, and its first end is even Connecing the second end of described second inductance, its second end connects the anode and the described 4th of described 3rd diode The anode of diode, described output loading includes that output capacitance, load or output capacitance are in parallel with load In any one.
According to one embodiment of present invention, during the conducting of described switching tube, the signal circuit of described front stage circuits For: the signal of described positive input terminal is adopted via described first diode, the first inductance, switching tube and peak value Sample resistive transmission is to described negative input end, and the signal circuit of described late-class circuit is: the of described bus capacitor The signal of one end is via described switching tube, peak value sampling resistance, sampling resistor, the second inductance, output loading The second end with the 3rd diode transmission to described bus capacitor;When described switching tube disconnects, described prime electricity The signal circuit on road is: the electric current flowing through described first inductance continues via described bus capacitor and the second diode Stream is back to described first inductance;The signal circuit of described late-class circuit is: flow through the electricity of described second inductance Flow through and be back to described second inductance by described output loading, the 4th diode and sampling resistor afterflow.
According to one embodiment of present invention, described front stage circuits includes:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its anode connects the first end of described input capacitance;
First inductance, its first end connects the negative electrode of described first diode;
Second diode, its negative electrode connects negative electrode or the anode of described first diode;
4th diode, its anode connects the second end of described first inductance;
Described bus capacitor, its first end connects the negative electrode of described 4th diode, and its second end connects described The anode of the second diode;
Described switching tube, its first power end connects the second end of described first inductance, and it controls outside end reception The driving signal in portion;
Peak value sampling resistance, its first end connects the second power end of described switching tube, and its second end connects institute State the second end of input capacitance;
Described late-class circuit includes:
Described bus capacitor;
Described switching tube;
Described peak value sampling resistance;
Described 4th diode;
3rd diode, its negative electrode connects the second end of described bus capacitor;
Sampling resistor, its first end connects the second end of described peak value sampling resistance, and its second end connects described The anode of the 3rd diode;
Second inductance, its first end connects the first power end of described switching tube, the second of described second inductance The negative electrode of end and described 4th diode is as load access interface.
According to one embodiment of present invention, described late-class circuit also includes: output loading, and its first end is even Connecing the negative electrode of described 4th diode, its second end connects the second end of described second inductance, and described output is born Carry for output capacitance, load or output capacitance in parallel with load in any one.
According to one embodiment of present invention, during the conducting of described switching tube, the signal circuit of described front stage circuits For: the signal of described positive input terminal is adopted via described first diode, the first inductance, switching tube and peak value Sample resistive transmission is to described negative input end, and the signal circuit of described late-class circuit is: the of described bus capacitor The signal of one end is via described output loading, the second inductance, switching tube, peak value sampling resistance, sampling resistor The second end with the 3rd diode transmission to described bus capacitor;When described switching tube disconnects, described prime electricity The signal circuit on road is: flow through described first inductance via described 4th diode, bus capacitor and Two diode continuousing flows are back to described first inductance, or flow through the electric current of described first inductance via described Four diodes, bus capacitor, the second diode and the second diode continuousing flow are back to described first inductance, The signal circuit of described late-class circuit is: flow through the electric current of described second inductance via described 4th diode and Output loading afterflow is back to described second inductance.
According to one embodiment of present invention, described front stage circuits includes: input capacitance, and its first end is even Connecing positive input terminal, its second end connects negative input end;
First diode, its anode connects the first end of described input capacitance;
First inductance, its first end connects the negative electrode of described first diode;
Second diode, its negative electrode connects negative electrode or the anode of described first diode;
4th diode, its anode connects the second end of described first inductance;
Described bus capacitor, its first end connects the negative electrode of described 4th diode, and its second end connects described The anode of the second diode;
Described switching tube, its first power end connects the second end of described first inductance, and it controls outside end reception The driving signal in portion, its second power end connects the second end of described input capacitance;
Described late-class circuit includes:
Described bus capacitor;
Described switching tube;
Described 4th diode;
3rd diode, its negative electrode connects the second end of described bus capacitor;
Sampling resistor, its first end connects the second power end of described switching tube, and its second end connects described the The anode of three diodes;
Second inductance, its first end connects the first power end of described switching tube, the second of described second inductance The negative electrode of end and described 4th diode is as load access interface.
According to one embodiment of present invention, described late-class circuit also includes: output loading, and its first end is even Connecing the negative electrode of described 4th diode, its second end connects the second end of described second inductance, and described output is born Carry for output capacitance, load or output capacitance in parallel with load in any one.
According to one embodiment of present invention, during the conducting of described switching tube, the signal circuit of described front stage circuits For: the signal of described positive input terminal transmits to institute via described first diode, the first inductance and switching tube Stating negative input end, the signal circuit of described late-class circuit is: the signal of the first end of described bus capacitor via Described output loading, the second inductance, switching tube, sampling resistor and the transmission of the 3rd diode are to described bus electricity The second end held;When described switching tube disconnects, the signal circuit of described front stage circuits is: flow through described first Inductance via described 4th diode, bus capacitor and the second diode continuousing flow be back to described first electricity Sense, or flow through the electric current of described first inductance via described 4th diode, bus capacitor, the two or two pole Pipe and the second diode continuousing flow are back to described first inductance, and the signal circuit of described late-class circuit is: stream It is back to described second via described 4th diode and output loading afterflow through the electric current of described second inductance Inductance.
According to one embodiment of present invention, described front stage circuits the most also includes input capacitance and the first electricity Sense, described late-class circuit the most also includes the second inductance and output loading, this output loading be output capacitance, Load or output capacitance in parallel with load in any one, wherein,
During the conducting of described switching tube, described input capacitance, the first inductance and switching tube form the first loop, Described bus capacitor, switching tube, the second inductance and output loading form second servo loop;
During described switching tube turns off, described first inductance, bus capacitor formation tertiary circuit, described second Inductance and output loading form the 4th loop.
According to one embodiment of present invention, during the conducting of described switching tube, the electricity at described first inductance two ends Pressure rises equal to the voltage at described input capacitance two ends, the electric current of described first inductance, described second inductance two The voltage of end is equal to the voltage at described bus capacitor two ends and the difference of the voltage at load access interface two ends, institute The electric current stating the second inductance rises;During described switching tube turns off, the voltage at described first inductance two ends is equal to The voltage at described bus capacitor two ends, the electric current of described first inductance declines, the electricity at described second inductance two ends Pressure declines equal to the voltage at load access interface two ends, the electric current of described second inductance.
According to one embodiment of present invention, described switching tube is power MOSFET, described One power end is the drain electrode of described mosfet transistor, and described second power end is that described MOSFET is brilliant The source electrode of body pipe, described control end is the grid of described mosfet transistor.
According to one embodiment of present invention, described switching tube is pliotron, and described first power end is The colelctor electrode of described pliotron, described second power end is the emitter stage of described pliotron, described Control the base stage that end is described pliotron.
According to one embodiment of present invention, described switching tube is source drive cubicle switch device, including One MOS transistor and the second MOS transistor, wherein, described first power end is a described MOS The drain electrode of transistor, described second power end is the source electrode of described second MOS transistor, described control end For the grid of described second MOS transistor, the source electrode of described first MOS transistor connects described second The drain electrode of MOS transistor, the grid of described first MOS transistor receives the DC voltage preset.
According to one embodiment of present invention, this constant-current circuit also includes: commutator, the alternating current to input Source signal rectification, its positive output end connects described positive input terminal, and its negative output terminal connects described negative input end.
Present invention also offers a kind of High Power Factor low harmonics distortion constant-current device, including:
High-power-factor low-harmonic-distortconstant constant current circuit described in any of the above-described item;
Current constant control driver, the sampling of its current sample end obtains the current information of described sampling resistor, described Current constant control driver produces for turning off driving of described switching tube according to the current information of described sampling resistor Dynamic signal is to realize constant output current.
According to one embodiment of present invention, adopt described in the current sample end connection of described current constant control driver First end of sample resistance, the second end ground connection of described sampling resistor;Or, described current constant control driver Current sample end connects the second end of described sampling resistor, the first end ground connection of described sampling resistor.
According to one embodiment of present invention, described current constant control driver also has zero passage detection end, this mistake Zero test side obtains the current over-zero information of described second inductance, and described current constant control driver is according to described the The current over-zero information of two inductance produces for turning on the driving signal of described switching tube to realize output no-load Protection.
According to one embodiment of present invention, the zero passage detection end of described current constant control driver divides via resistance Pressure network network is connected with the second end of described second inductance, and wherein, the input of described resistance pressure-dividing network connects Second end of described second inductance, the outfan of described resistance pressure-dividing network connects described current constant control driver Zero passage detection end.
According to one embodiment of present invention, this constant-current device also includes: auxiliary with described second inductive Winding, described zero passage detection end is helped to connect the first end of this auxiliary winding, the second end ground connection of this auxiliary winding.
According to one embodiment of present invention, this constant-current device also includes: auxiliary with described second inductive Winding, described zero passage detection end is helped to be connected with the first end of described auxiliary resistance via resistance pressure-dividing network, institute State the second end ground connection of auxiliary winding, wherein, the input of described resistance pressure-dividing network connect described auxiliary around First end of group, the outfan of described resistance pressure-dividing network connects the zero passage detection of described current constant control driver End.
According to one embodiment of present invention, described High-power-factor low-harmonic-distortconstant constant current circuit is that right is wanted The circuit according to any one of 5 to 10, described current constant control driver is asked also to have peak point current current limliting end, This peak point current current limliting end is connected to obtain peak current information with the first end of described peak value sampling resistance, institute State current constant control driver and produce described driving signal according to described current information and peak current information.
Compared with prior art, the invention have the advantages that
The High-power-factor low-harmonic-distortconstant constant current circuit of the embodiment of the present invention is quasi-single-stage configuration, front stage circuits For buck (BUCK-BOOST) circuit, being operated in buck-boost mode, late-class circuit is blood pressure lowering (BUCK) Circuit, is operated in decompression mode, and two-stage circuit shares same switching tube, compares traditional two-stage type structure, Circuit structure is simpler, advantageously reduces circuit cost;Compare traditional single stage type structure, be substantially reduced Output is to the ripple current in load, it is to avoid stroboscopic problem.
Further, the front stage circuits work of the High-power-factor low-harmonic-distortconstant constant current circuit of the embodiment of the present invention Make at buck-boost mode, input current can be made to follow the change of input voltage and in sinusoidal wave form, energy always Enough realize low harmonics distortion (THD), the requirement of THD under particular application < 10% can be met.
It addition, the late-class circuit of the High-power-factor low-harmonic-distortconstant constant current circuit of the embodiment of the present invention is operated in Decompression mode, in addition to can realizing high power, coupled current constant control driver can directly be led to Cross the current information (being equal to outputting inductance electric current) obtained on sampling resistor and realize output loading constant current control System, can simplify circuit structure further, and constant current accuracy is higher.
Accompanying drawing explanation
Fig. 1 is a kind of AC-DC power conversion using two stage power factor correcting technology in prior art The theory diagram of device;
Fig. 2 is the circuit structure signal of a kind of single-stage buck type constant current circuit with high power factor in prior art Figure;
Fig. 3 is the circuit knot of the first embodiment of the High Power Factor low harmonics distortion constant-current device of the present invention Structure schematic diagram;
Fig. 4 be the present invention High Power Factor low harmonics distortion constant-current device in the cubicle switch of source drive The structural representation of device;
Fig. 5 be the constant-current device of High Power Factor low harmonics distortion shown in Fig. 4 in the first operative state Schematic equivalent circuit;
Fig. 6 be the constant-current device of High Power Factor low harmonics distortion shown in Fig. 4 in a second operative state etc. Effect circuit diagram;
Fig. 7 is the circuit knot of the second embodiment of the High Power Factor low harmonics distortion constant-current device of the present invention Structure schematic diagram;
Fig. 8 is the circuit knot of the 3rd embodiment of the High Power Factor low harmonics distortion constant-current device of the present invention Structure schematic diagram;
Fig. 9 is the circuit knot of the 4th embodiment of the High Power Factor low harmonics distortion constant-current device of the present invention Structure schematic diagram;
Figure 10 is the circuit of the 5th embodiment of the High Power Factor low harmonics distortion constant-current device of the present invention Structural representation;
Figure 11 is the circuit of the sixth embodiment of the High Power Factor low harmonics distortion constant-current device of the present invention Structural representation;
Figure 12 be the constant-current device of High Power Factor low harmonics distortion shown in Figure 11 in the first operative state Schematic equivalent circuit;
Figure 13 be the constant-current device of High Power Factor low harmonics distortion shown in Figure 11 in a second operative state Schematic equivalent circuit;
Figure 14 is the circuit of the 7th embodiment of the High Power Factor low harmonics distortion constant-current device of the present invention Structural representation.
Detailed description of the invention
The High-power-factor low-harmonic-distortconstant constant current circuit of the present embodiment includes the front stage circuits intercoupled And late-class circuit, wherein front stage circuits is step-up/step-down circuit, and late-class circuit is reduction voltage circuit, Er Qieqian Level circuit and the general same switching tube of late-class circuit and bus capacitor.
Wherein, front stage circuits at least can include switching tube, bus capacitor, input capacitance and the first electricity Sense, late-class circuit at least can include switching tube, bus capacitor the second inductance and output loading, wherein During switching tube conducting, input capacitance, the first inductance and switching tube form the first loop, bus capacitor, Switching tube, the second inductance and output loading form second servo loop;During switching tube turns off, the first inductance, mother Line capacitance forms tertiary circuit, the second inductance and output loading and forms the 4th loop.
Furthermore, during switching tube conducting, the voltage at the first inductance two ends is equal to input capacitance two ends Voltage, the electric current of the first inductance rises, the voltage at the second inductance two ends equal to bus capacitor two ends voltage with The difference of the voltage at load access interface two ends, the electric current of the second inductance rises;During switching tube turns off, the The voltage at one inductance two ends declines equal to the voltage at bus capacitor two ends, the electric current of the first inductance, the second inductance The voltage at two ends declines equal to the voltage at load access interface two ends, the electric current of the second inductance
Below in conjunction with specific embodiments and the drawings, the invention will be further described, but should not limit with this Protection scope of the present invention.
First embodiment
The High Power Factor low harmonics distortion constant-current device of first embodiment is shown with reference to Fig. 3, Fig. 3, Including High-power-factor low-harmonic-distortconstant constant current circuit and coupled current constant control driver 301. Wherein, High-power-factor low-harmonic-distortconstant constant current circuit includes rectifier bridge BR, front stage circuits and rear class Circuit, front stage circuits is step-up/step-down circuit, and late-class circuit is reduction voltage circuit, front stage circuits and rear class electricity Road shares same switching tube Q1With bus capacitor Cb
More specifically, the front stage circuits in first embodiment includes: input capacitance Cin, the one or two Pole pipe D1, the first inductance L1, bus capacitor Cb, the second diode D2, switching tube Q1;This rear class Circuit includes: bus capacitor Cb, switching tube Q1, the 3rd diode D3, sampling resistor Rs, second Inductance L2, the 4th diode D4And output capacitance Co.Current constant control driver 301 is used for exporting negative Carry current constant control, can be the constant-current control circuit that in prior art, any one is suitable.
Furthermore, rectifier bridge BR carries out rectification to the ac supply signal AC of input, and it is just Output termination input capacitance CinThe first end, its negative output termination input capacitance CinThe second end;The One diode D1Anode connect input capacitance CinThe first end, negative electrode connects the first inductance L1? One end;Second diode D2Negative electrode meet the first diode D1Negative electrode and the first inductance L1First End;Bus capacitor CbFirst termination the first inductance L1The second end, second termination the second diode D2Anode;Switching tube Q1The first power end connect the first inductance L1The second end, its second merit Rate termination input capacitance CinThe second end and sampling resistor RsThe first end, it controls end and receives outside Driving signal;3rd diode D3Negative electrode meet the second diode D2Anode and bus capacitor Cb The second end;Sampling resistor RsThe first end connecting valve pipe Q1The second power end, second termination Second inductance L2The first end;4th diode D4Negative electrode meet switching tube Q1The second power end and Sampling resistor RsThe first end, its anode meets the 3rd diode D3Anode;Second inductance L2? One termination sampling resistor RsThe second end;Output capacitance CoFirst termination the second inductance L2Second End, its second termination the 3rd diode D3With the 4th diode D4Anode;Output capacitance CoTwo End is as load access interface, output loading and output capacitance CoParallel connection, output loading and output capacitance CoOutput loading can be collectively referred to as.Certainly, output loading can also only include load or output electricity Hold Co
In first embodiment, the current sample end CS of current constant control driver 301 connects sampling resistor RsThe first end, the ground end SGND ground connection of current constant control driver 301, current constant control driver 301 Outfan PWM meet switching tube Q1Control end, the zero passage detection end of current constant control driver 301 ZCD connects the second inductance L by resistance pressure-dividing network 3022The second end.Non-limiting as one Example, the resistance pressure-dividing network 302 in Fig. 3 includes resistance R1With resistance R2, wherein, zero passage is examined Survey end ZCD connecting resistance R1The second end and resistance R2The first end, resistance R1The first termination the Two inductance L2The first end and ground end SGND, resistance R2Second termination the second inductance L2Second End.
The sampling resistor R that current constant control driver 301 samples according to current sample end CSsElectric current The second inductance L that information and zero passage detection end ZCD detect2Current over-zero information (such as may be used With by resistance R1With resistance R2To the second inductance L2The voltage of the second end carry out dividing potential drop detection and obtain) Producing and drive signal, this driving signal is via outfan PWM transmission to switching tube Q1Control end, For controlling switching tube Q1Turn-on and turn-off.Specifically, current constant control driver 301 is according to this Current information produces for on-off switching tube Q1Driving signal to realize constant output current, constant current control Driver 301 processed produces according to this current over-zero information and is used for turning on switching tube Q1Driving signal with reality Existing output no-load protection.
Current constant control driver 301 preferably well known to a person skilled in the art constant-current control circuit, opens Close pipe Q1The driving signal produced in control circuit 301 controls periodically to turn on and end to realize Output load current constant current.
Switching tube Q1Can be such as power MOSFET, wherein, switching tube Q1First Power end is the drain electrode of mosfet transistor, and the second power end is the source electrode of mosfet transistor, Controlling end is the grid of mosfet transistor;Or, switching tube Q1Can be pliotron, Switching tube Q1The colelctor electrode that the first power end is pliotron, the second power end is described power three The emitter stage of pole pipe, controls the base stage that end is described pliotron.
Or, switching tube Q1Can also is that the cubicle switch device of the source drive shown in Fig. 4, this source The cubicle switch device that pole drives includes the first MOS transistor QaWith the second MOS transistor Qb, Wherein, the first power end is the first MOS transistor QaDrain electrode, the second power end is the 2nd MOS Transistor QbSource electrode, control end be the second MOS transistor QbGrid, a MOS crystal Pipe QaSource electrode connect the second MOS transistor QbDrain electrode, the first MOS transistor QaGrid Receive the DC voltage preset.As a nonrestrictive example, this DC voltage preset is permissible By direct voltage source VdcThere is provided, such as direct voltage source VdcOne end and the first MOS transistor Grid connects, other end ground connection.
It is that the High Power Factor low harmonics distortion constant-current device shown in Fig. 3 is first with reference to Fig. 5, Fig. 5 Equivalent circuit diagram during duty, in figure, grey parts represents that line related and device are not involved in work. At the first duty, switching tube Q1Conducting, input ac power signal AC rectified bridge BR is whole Sinusoidal half-wave voltage after stream is through the first diode D1, the first inductance L1With switching tube Q1Constitute The first inductance L is given in loop1Charging, flows through the first inductance L1Electric current iL1Rise, namely the first electricity Sense L1Energy storage;Meanwhile, bus capacitor CbThrough switching tube Q1, sampling resistor Rs, the second inductance L2、 Output capacitance CoWith the 3rd diode D3The second inductance L is given in the loop constituted2Charging, the second inductance L2 Electric current iL2Rise, the second inductance L2Energy storage.Switching tube Q1During conducting, the first inductance L1Two ends Voltage is equal to input capacitance CinThe voltage at two ends, the second inductance L2The voltage at two ends is equal to bus capacitor CbBoth end voltage and output capacitance CoBoth end voltage or the difference of load both end voltage.
With reference to the constant-current device that Fig. 6, Fig. 6 are the High Power Factor low harmonics distortion shown in Fig. 2 the Equivalent circuit diagram during two duties, in figure, grey parts represents that line related and device are not involved in work Make.At the second duty, switching tube Q1Disconnect, flow through the first inductance L1Electric current iL1Through bus Electric capacity CbWith the second diode D2Constitute loop afterflow, electric current iL1Decline;Meanwhile, is flowed through Two inductance L2Electric current iL2Through output capacitance Co, the 4th diode D4With sampling resistor RsConstitute Loop afterflow, electric current iL2Decline.
As seen from the above analysis, sampling resistor R is flowed throughsElectric current be the second inductance L2Electric current iL2, Therefore have only to sampling resistor RsCurrent information sample current constant control driver 301, by one The constant-current control circuit of a little prior aries can realize the current constant control to output loading;Additionally, pass through By the second inductance L2Electric current iL2Zero passage information (such as by detecting second end of the second inductance L2 Voltage zero-cross information obtain) send into current constant control driver 301, electric current i can be realizedL2For critical Continuous mode (BCM or CRM).Meanwhile, only stream need to be made by rational parameter designing Through the first inductance L1Electric current iL1It is operated in critical continuous conduction mode (BCM or CRM) or discontinuous current Pattern (DCM), gets final product nature and realizes the PFC of AC input current.
Additionally, by the bus capacitor C of larger capacitybBus capacitor C can be reducedbThe voltage at two ends Ripple, thus obtain less output load current ripple, eliminate 100Hz stroboscopic.
Second embodiment
The High Power Factor low harmonics distortion constant-current device of the second embodiment it is shown with reference to Fig. 7, Fig. 7. The High-power-factor low-harmonic-distortconstant constant current circuit of the present embodiment phase basic with aforesaid first embodiment With, operation principle is the most essentially identical, so no longer describing in detail.
The High-power-factor low-harmonic-distortconstant constant current circuit of the present embodiment is with first embodiment shown in Fig. 3 not The contact of current constant control driver 701 and High-power-factor low-harmonic-distortconstant constant current circuit it is with part Change.In the present embodiment, the ground end SGND of current constant control driver 701 connects sampling resistor RsThe first end, the current sample end CS of current constant control driver 701 meets sampling resistor RsSecond End, the current information therefore sending into current constant control driver 701 is the second negative inductive current information, Implement with shown in Fig. 3 first internal equally the realization after reverse of current constant control driver 701 The basic function that example is identical, such as PFC, output constant current etc..
3rd embodiment
The High Power Factor low harmonics distortion constant-current device of the 3rd embodiment it is shown with reference to Fig. 8, Fig. 8. The present embodiment is the second inductance L with first embodiment difference shown in Fig. 32Current over-zero detection Mode is different.
In the present embodiment, also include and the second inductance L2The auxiliary winding L of coupling2a, assist winding L2aFor detecting the second inductance L2Current over-zero information, the second inductance L2Be equivalent to and assist winding L2aCoupling forms transformator, assists winding L2aDifferent name end ground connection, assist winding L2aSame Name of Ends The input of connecting resistance potential-divider network 302.Wherein, resistance pressure-dividing network 302 includes the resistance of series connection R1With resistance R2
The present embodiment main circuit is essentially identical with first embodiment shown in Fig. 3, operation principle also basic phase With, so no longer describing in detail.
4th embodiment
The High Power Factor low harmonics distortion constant-current device of the 4th embodiment it is shown with reference to Fig. 9, Fig. 9. The circuit structure of the present embodiment is essentially identical with the 3rd embodiment shown in Fig. 7, and operation principle is the most basic Identical.
3rd embodiment difference shown in the present embodiment and Fig. 7 be current constant control driver 701 and The contact of High-power-factor low-harmonic-distortconstant constant current circuit changes.In the present embodiment, current constant control The ground end SGND of driver 701 meets sampling resistor RsThe first end, current constant control driver 701 Current sample end CS meets sampling resistor RsThe second end, therefore send into current constant control driver 701 Current information is the second negative inductance L2Current information, internal through anti-in current constant control driver 701 To the most equally realizing the basic function identical with the 3rd embodiment shown in Fig. 7, such as power factor Correction, output constant current etc..
5th embodiment
The High Power Factor low harmonics distortion constant current dress of the 5th embodiment it is shown with reference to Figure 10, Figure 10 Put.The circuit structure of the present embodiment is essentially identical with the first embodiment shown in Fig. 3, and operation principle is also Essentially identical.
The present embodiment is front stage circuits and rear class in place of the main difference of first embodiment shown in Fig. 3 Circuit both increases peak value sampling resistance R3, its first termination power switching tube Q1The second power end, Its second end and input capacitance CinThe second end, the negative electrode of the 4th diode and sampling resistor Rs's First end connects.Peak value sampling resistance R3First termination current constant control driver 301 peak point current Current limliting end IL, it is achieved switch tube Q1Peak inrush current control.
It addition, it will be appreciated by those skilled in the art that above-mentioned increase peak value sampling resistance R3Controlling party Method, can apply in this specification in other all embodiments, and main purpose is to ensure switching tube Q1The peak point current flow through is less than the certain level preset.
Sixth embodiment
The High Power Factor low harmonics distortion constant current dress of sixth embodiment is shown with reference to Figure 11, Figure 11 Put, including High-power-factor low-harmonic-distortconstant constant current circuit and coupled current constant control driver 301.Wherein, High-power-factor low-harmonic-distortconstant constant current circuit include rectifier bridge BR, front stage circuits and Late-class circuit, this front stage circuits is step-up/step-down circuit, and this late-class circuit is reduction voltage circuit, front stage circuits Same switching tube Q is shared with late-class circuit1With bus capacitor Cb
More specifically, the front stage circuits in sixth embodiment includes: input capacitance Cin, the one or two Pole pipe D1, the first inductance L1, the second diode D2, the 4th diode D4, bus capacitor Cb, open Close pipe Q1, peak value sampling resistance R3;This late-class circuit includes: bus capacitor Cb, switching tube Q1、 Peak value sampling resistance R3, the 3rd diode D3, the 4th diode D4, sampling resistor Rs, second electricity Sense L2And output capacitance Co.Current constant control driver 301 is for output loading current constant control, Ke Yishi The constant-current control circuit that in prior art, any one is suitable.
Furthermore, rectifier bridge BR carries out rectification to the ac supply signal AC of input, and it is just Output termination input capacitance CinThe first end, its negative output termination input capacitance CinThe second end;The One diode D1Anode connect input capacitance CinThe first end, negative electrode connects the first inductance L1? One end;Second diode D2Negative electrode meet the first diode D1Negative electrode and the first inductance L1First End;First inductance L1First termination the first diode D1With the second diode D2Negative electrode;3rd Diode D3Negative electrode meet the second diode D2Anode;4th diode D4Anode connect first electricity Sense L1The second end;Bus capacitor CbFirst termination the 4th diode D4Negative electrode, second termination Second diode D2Anode and the 3rd diode D3Negative electrode;Switching tube Q1The first power end even Meet the first inductance L1The second end and the 4th diode D4Anode, its second power terminations sampling electricity Resistance RsThe first end, its control end receive outside driving signal;Peak value sampling resistance R3First End connecting valve pipe Q1The second power end, second termination input capacitance CinThe second end;Sampling electricity Resistance RsFirst end connect peak value sampling resistor R3The second end, second end connect the 3rd diode D3 Anode and ground connection;Second inductance L2First termination switching tube Q1The first power end;Output electricity Hold CoFirst termination the 4th diode D4Negative electrode and bus capacitor CbThe first end, it is second years old Terminate the second inductance L2The second end;Output capacitance CoTwo ends as load access interface, output Electric capacity CoIt is configured in parallel with load, output capacitance CoOutput loading can be collectively referred to as with load.When So, output loading can also only include load or output capacitance Co
In first embodiment, the current sample end CS of current constant control driver 301 connects sampling resistor RsThe first end, the ground end SGND of current constant control driver 301 connects sampling resistor RsThe second end, The outfan PWM of current constant control driver 301 meets switching tube Q1Control end, current constant control drive The zero passage detection end ZCD of device 301 is by resistance pressure-dividing network 302 and auxiliary winding L2aThe first end It is connected.As a nonrestrictive example, the resistance pressure-dividing network 302 in Figure 11 includes resistance R1With resistance R2, wherein, zero passage detection end ZCD connecting resistance R2The second end and resistance R1? One end, resistance R2First termination auxiliary winding L2aThe first end (or perhaps Same Name of Ends), electricity Resistance R1Second termination auxiliary winding L2aThe second end (or perhaps different name end) and ground connection.
The switching tube Q that current constant control driver 301 samples according to current sample end CS1Electric current letter The second inductance L that breath and zero passage detection end ZCD detect2Current over-zero information (the most permissible By resistance R1With resistance R2To auxiliary winding L2aThe voltage of the first end carry out dividing potential drop detection and obtain) produce Raw driving signal, this driving signal is via outfan PWM transmission to switching tube Q1Control end, use In controlling switching tube Q1Turn-on and turn-off.
As a preferred embodiment, this current constant control driver 301 also has peak point current sampling End IL, this peak point current sampling end IL sampling obtains switching tube Q1Peak current information, constant current control This peak current information is compared by driver 301 processed with internal reference signal, and according to comparative result and electricity Stream information and current over-zero information produce and drive signal, to control switching tube Q1Maximum current.Certainly, It will be appreciated by those skilled in the art that this peak point current sampling end IL and switch tube Q1Maximum electricity The control of stream is optional.
Current constant control driver 301 preferably well known to a person skilled in the art constant-current control circuit, opens Close pipe Q1The driving signal produced in control circuit 301 controls periodically to turn on and end to realize Output load current constant current.
Switching tube Q1Can be such as power MOSFET, wherein, switching tube Q1First Power end is the drain electrode of mosfet transistor, and the second power end is the source electrode of mosfet transistor, Controlling end is the grid of mosfet transistor;Or, switching tube Q1Can be pliotron, Switching tube Q1The colelctor electrode that the first power end is pliotron, the second power end is described power three The emitter stage of pole pipe, controls the base stage that end is described pliotron.
Or, switching tube Q1Can also is that the cubicle switch device of the source drive shown in Fig. 4, this source The cubicle switch device that pole drives includes the first MOS transistor QaWith the second MOS transistor Qb, Wherein, the first power end is the first MOS transistor QaDrain electrode, the second power end is the 2nd MOS Transistor QbSource electrode, control end be the second MOS transistor QbGrid, a MOS crystal Pipe QaSource electrode connect the second MOS transistor QbDrain electrode, the first MOS transistor QaGrid Receive the DC voltage preset.As a nonrestrictive example, this DC voltage preset is permissible By direct voltage source VdcThere is provided, such as direct voltage source VdcOne end and the first MOS transistor Grid connects, other end ground connection.
In sixth embodiment shown in Figure 11, the current sampling signal of current constant control driver 301 comprises One inductive current information and the second inductive current information, be to be gone by the peak current information on sampling switch pipe Control output load current.
Figure 12 is that the High Power Factor low harmonics distortion constant-current device shown in Figure 11 is when the first duty Equivalent circuit diagram, in figure, grey parts represents that this circuit is not involved in work.At the first duty, switching tube Q1Conducting, the sinusoidal half-wave voltage after input ac power signal AC rectified bridge BR rectification is through first Diode D1, the first inductance L1, switching tube Q1With peak value sampling resistance R3The first inductance is given in the loop become L1Charging, flows through the first inductance L1Electric current iL1Rise;Meanwhile, bus capacitor CbThrough output capacitance Co、 Second inductance L2, switching tube Q1, peak value sampling resistance R3, sampling resistor RsWith the 3rd diode D3Structure The second inductance L is given in the loop become2Charging, the second inductance L2Electric current iL2Rise.
Figure 13 is that the High Power Factor low harmonics distortion constant-current device shown in Figure 11 is when the second duty Equivalent circuit diagram, in figure, grey parts represents that this circuit is not involved in work.At the second duty, switching tube Q1Disconnect, flow through the first inductance L1Electric current iL1Through the 4th diode D3, bus capacitor CbWith the two or two Pole pipe D2Constitute loop afterflow, electric current iL1Decline;Meanwhile, the second inductance L is flowed through2Electric current iL2 Through output capacitance CoWith the 4th diode D4The loop afterflow constituted, electric current iL2Decline.
7th embodiment
The High Power Factor low harmonics distortion constant current dress of the 7th embodiment is shown with reference to Figure 14, Figure 14 Put, including High-power-factor low-harmonic-distortconstant constant current circuit and coupled current constant control driver 301.It is essentially identical with sixth embodiment shown in Figure 11, differs primarily in that, in the 7th embodiment First diode D1With the second diode D2Annexation be slightly different, in the 7th embodiment Two diode D2Negative electrode be connected to the first diode D1Anode, rather than be connected directly to first electricity Hold L1The first end.
Although in above-mentioned 6th and the 7th embodiment, the current sample end of current constant control driver connects to be adopted First end of sample resistance, the second end ground connection of sampling resistor;But, those skilled in the art should manage Solving, the current sample end of current constant control driver can connect the second end of sampling resistor, and electricity of sampling First end ground connection of resistance, so, the current information sending into current constant control driver is negative current information, After reversely, the merit similar with previous embodiment is equally realized in current constant control internal drive Can, such as PFC, output constant current etc..
In addition, it is necessary to explanation is, although the current constant control driver in above multiple embodiments all has There is zero passage detection end, make rear class reduction voltage circuit work by the current over-zero information detecting the second inductance Make at electric current critical continuous mode conduction mode, but this zero passage detection end is not necessary.This area skill Art personnel should be appreciated that the second level reduction voltage circuit when this High-power-factor low-harmonic-distortconstant constant current circuit When being operated in the mode of operations such as such as fixed frequency, current constant control driver can also need not possess zero passage inspection Survey end.
It addition, in the circuit structure of above-mentioned multiple embodiment, output capacitance is all optional, and it is main For energy storage and filtering, output ripple can be reduced further.More specifically, if load is LED, then output capacitance is not necessarily;If load is not LED, then preferably comprise this output electricity Hold.
Although the present invention is open as above with preferred embodiment, but it is not for limiting the present invention, appoints What those skilled in the art without departing from the spirit and scope of the present invention, can make possible change Dynamic and amendment, therefore protection scope of the present invention should with the claims in the present invention defined in the range of Accurate.

Claims (25)

1. a High-power-factor low-harmonic-distortconstant constant current circuit, it is characterised in that include intercoupling Front stage circuits and late-class circuit, wherein,
This front stage circuits is the step-up/step-down circuit for realizing PFC;
This late-class circuit is the reduction voltage circuit for DC-dc conversion, and this front stage circuits and rear class electricity Road shares same switching tube and bus capacitor,
Wherein, described front stage circuits includes:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its anode connects the first end of described input capacitance;
Second diode, its negative electrode connects the negative electrode of described first diode;
First inductance, its first end connects described first diode and the negative electrode of the second diode;
Described bus capacitor, its first end connects the second end of described first inductance, and its second end connects described The anode of the second diode;
Described switching tube, its first power end connects the second end of described first inductance and described bus capacitor First end, its second power end connects the second end of described input capacitance, and it controls the driving outside end reception Signal;
Described late-class circuit includes:
Described bus capacitor;
Described switching tube;
3rd diode, its negative electrode connects the second end of described bus capacitor;
4th diode, its negative electrode connects the second power end of described switching tube, and its anode connects the described 3rd The anode of diode;
Sampling resistor, its first end connects the second power end of described switching tube;
Second inductance, its first end connects the second end of described sampling resistor, the second end of described second inductance With the anode of described 3rd diode as load access interface.
High-power-factor low-harmonic-distortconstant constant current circuit the most according to claim 1, it is characterised in that Described late-class circuit also includes:
Output loading, its first end connects the second end of described second inductance, and its second end connects the described 3rd The anode of diode and the anode of described 4th diode, described output loading be output capacitance, load or Any one during person's output capacitance is in parallel with load.
High-power-factor low-harmonic-distortconstant constant current circuit the most according to claim 2, it is characterised in that During the conducting of described switching tube, the signal circuit of described front stage circuits is: the signal of described positive input terminal is via institute State the first diode, the first inductance and switching tube transmission to described negative input end, the signal of described late-class circuit Loop is: the signal of the first end of described bus capacitor via described switching tube, sampling resistor, the second inductance, Output loading and the second end of the 3rd diode transmission extremely described bus capacitor;When described switching tube disconnects, institute The signal circuit stating front stage circuits is: flow through the electric current of described first inductance via described bus capacitor and second Diode continuousing flow is back to described first inductance;The signal circuit of described late-class circuit is: flow through described second The electric current of inductance is back to described second via described output loading, the 4th diode and sampling resistor afterflow Inductance.
4. a High-power-factor low-harmonic-distortconstant constant current circuit, it is characterised in that include intercoupling Front stage circuits and late-class circuit, wherein,
This front stage circuits is the step-up/step-down circuit for realizing PFC;
This late-class circuit is the reduction voltage circuit for DC-dc conversion, and this front stage circuits and rear class electricity Road shares same switching tube and bus capacitor,
Wherein, described front stage circuits includes:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its anode connects the first end of described input capacitance;
Second diode, its negative electrode connects the negative electrode of described first diode;
First inductance, its first end connects described first diode and the negative electrode of the second diode;
Described bus capacitor, its first end connects the second end of described first inductance, and its second end connects described The anode of the second diode;
Described switching tube, its first power end connects the second end of described first inductance and described bus capacitor First end, it controls the driving signal outside end reception;
Peak value sampling resistance, its first end connects the second power end of described switching tube, and its second end connects institute State the second end of input capacitance;
Described late-class circuit includes:
Described bus capacitor;
Described switching tube;
Described peak value sampling resistance;
3rd diode, its negative electrode connects the second end of described bus capacitor;
4th diode, its negative electrode connects the second end of described peak value sampling resistance, and its anode connects described the The anode of three diodes;
Sampling resistor, its first end connects the second end of described peak value sampling resistance;
Second inductance, its first end connects the second end of described sampling resistor, the second end of described second inductance And the anode of described 3rd diode is as load access interface.
High-power-factor low-harmonic-distortconstant constant current circuit the most according to claim 4, it is characterised in that Described late-class circuit also includes:
Output loading, its first end connects the second end of described second inductance, and its second end connects the described 3rd The anode of diode and the anode of described 4th diode, described output loading be output capacitance, load or Any one during person's output capacitance is in parallel with load.
High-power-factor low-harmonic-distortconstant constant current circuit the most according to claim 5, it is characterised in that During the conducting of described switching tube, the signal circuit of described front stage circuits is: the signal of described positive input terminal is via institute State the first diode, the first inductance, switching tube and peak value sampling resistive transmission to described negative input end, institute The signal circuit stating late-class circuit is: the signal of the first end of described bus capacitor is via described switching tube, peak Value sampling resistor, sampling resistor, the second inductance, output loading and the transmission of the 3rd diode are to described bus electricity The second end held;When described switching tube disconnects, the signal circuit of described front stage circuits is: flow through described first The electric current of inductance is back to described first inductance via described bus capacitor and the second diode continuousing flow;After described The signal circuit of level circuit is: flow through the electric current of described second inductance via described output loading, the four or two pole Pipe and sampling resistor afterflow are back to described second inductance.
7. a High-power-factor low-harmonic-distortconstant constant current circuit, it is characterised in that include intercoupling Front stage circuits and late-class circuit, wherein,
This front stage circuits is the step-up/step-down circuit for realizing PFC;
This late-class circuit is the reduction voltage circuit for DC-dc conversion, and this front stage circuits and rear class electricity Road shares same switching tube and bus capacitor,
Wherein, described front stage circuits includes:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its anode connects the first end of described input capacitance;
First inductance, its first end connects the negative electrode of described first diode;
Second diode, its negative electrode connects negative electrode or the anode of described first diode;
4th diode, its anode connects the second end of described first inductance;
Described bus capacitor, its first end connects the negative electrode of described 4th diode, and its second end connects described The anode of the second diode;
Described switching tube, its first power end connects the second end of described first inductance, and it controls outside end reception The driving signal in portion;
Peak value sampling resistance, its first end connects the second power end of described switching tube, and its second end connects institute State the second end of input capacitance;
Described late-class circuit includes:
Described bus capacitor;
Described switching tube;
Described peak value sampling resistance;
Described 4th diode;
3rd diode, its negative electrode connects the second end of described bus capacitor;
Sampling resistor, its first end connects the second end of described peak value sampling resistance, and its second end connects described The anode of the 3rd diode;
Second inductance, its first end connects the first power end of described switching tube, the second of described second inductance The negative electrode of end and described 4th diode is as load access interface.
High-power-factor low-harmonic-distortconstant constant current circuit the most according to claim 7, it is characterised in that Described late-class circuit also includes:
Output loading, its first end connects the negative electrode of described 4th diode, and its second end connects described second Second end of inductance, described output loading be output capacitance, load or output capacitance in parallel with load in Any one.
High-power-factor low-harmonic-distortconstant constant current circuit the most according to claim 8, it is characterised in that During the conducting of described switching tube, the signal circuit of described front stage circuits is: the signal of described positive input terminal is via institute State the first diode, the first inductance, switching tube and peak value sampling resistive transmission to described negative input end, institute The signal circuit stating late-class circuit is: the signal of the first end of described bus capacitor via described output loading, Second inductance, switching tube, peak value sampling resistance, sampling resistor and the transmission of the 3rd diode are to described bus electricity The second end held;When described switching tube disconnects, the signal circuit of described front stage circuits is: flow through described first Inductance via described 4th diode, bus capacitor and the second diode continuousing flow be back to described first electricity Sense, or flow through the electric current of described first inductance via described 4th diode, bus capacitor, the two or two pole Pipe and the second diode continuousing flow are back to described first inductance, and the signal circuit of described late-class circuit is: stream It is back to described second via described 4th diode and output loading afterflow through the electric current of described second inductance Inductance.
10. a High-power-factor low-harmonic-distortconstant constant current circuit, it is characterised in that include intercoupling Front stage circuits and late-class circuit, wherein,
This front stage circuits is the step-up/step-down circuit for realizing PFC;
This late-class circuit is the reduction voltage circuit for DC-dc conversion, and this front stage circuits and rear class electricity Road shares same switching tube and bus capacitor,
Wherein, described front stage circuits includes:
Input capacitance, its first end connects positive input terminal, and its second end connects negative input end;
First diode, its anode connects the first end of described input capacitance;
First inductance, its first end connects the negative electrode of described first diode;
Second diode, its negative electrode connects negative electrode or the anode of described first diode;
4th diode, its anode connects the second end of described first inductance;
Described bus capacitor, its first end connects the negative electrode of described 4th diode, and its second end connects described The anode of the second diode;
Described switching tube, its first power end connects the second end of described first inductance, and it controls outside end reception The driving signal in portion, its second power end connects the second end of described input capacitance;
Described late-class circuit includes:
Described bus capacitor;
Described switching tube;
Described 4th diode;
3rd diode, its negative electrode connects the second end of described bus capacitor;
Sampling resistor, its first end connects the second power end of described switching tube, and its second end connects described the The anode of three diodes;
Second inductance, its first end connects the first power end of described switching tube, the second of described second inductance The negative electrode of end and described 4th diode is as load access interface.
11. High-power-factor low-harmonic-distortconstant constant current circuit according to claim 10, its feature exists In, described late-class circuit also includes:
Output loading, its first end connects the negative electrode of described 4th diode, and its second end connects described second Second end of inductance, described output loading be output capacitance, load or output capacitance in parallel with load in Any one.
12. High-power-factor low-harmonic-distortconstant constant current circuit according to claim 11, its feature exists In, during the conducting of described switching tube, the signal circuit of described front stage circuits is: the signal warp of described positive input terminal By the transmission of described first diode, the first inductance and switching tube to described negative input end, described late-class circuit Signal circuit be: the signal of the first end of described bus capacitor via described output loading, the second inductance, Switching tube, sampling resistor and the second end of the 3rd diode transmission extremely described bus capacitor;Described switching tube breaks When opening, the signal circuit of described front stage circuits is: flow through described first inductance via described 4th diode, Bus capacitor and the second diode continuousing flow are back to described first inductance, or flow through described first inductance Electric current is back to via described 4th diode, bus capacitor, the second diode and the second diode continuousing flow Described first inductance, the signal circuit of described late-class circuit is: flow through the electric current of described second inductance via institute State the 4th diode and output loading afterflow is back to described second inductance.
13. 1 kinds of High-power-factor low-harmonic-distortconstant constant current circuit, it is characterised in that include intercoupling Front stage circuits and late-class circuit, wherein,
This front stage circuits is the step-up/step-down circuit for realizing PFC;
This late-class circuit is the reduction voltage circuit for DC-dc conversion, and this front stage circuits and rear class electricity Road shares same switching tube and bus capacitor,
Wherein, described front stage circuits the most also includes input capacitance and the first inductance, and described late-class circuit is at least Also including the second inductance and output loading, this output loading is output capacitance, load or output capacitance With load in parallel in any one, wherein,
During the conducting of described switching tube, described input capacitance, the first inductance and switching tube form the first loop, Described bus capacitor, switching tube, the second inductance and output loading form second servo loop;
During described switching tube turns off, described first inductance, bus capacitor formation tertiary circuit, described second Inductance and output loading form the 4th loop.
14. according to the High Power Factor low harmonics distortion Constant Electric Current according to any one of claim 1 to 13 Road, it is characterised in that during the conducting of described switching tube, the voltage at described first inductance two ends is equal to described defeated Entering the voltage at electric capacity two ends, the electric current of described first inductance rises, and the voltage at described second inductance two ends is equal to The difference of the voltage at the voltage at described bus capacitor two ends and load access interface two ends, described second inductance Electric current rises;During described switching tube turns off, the voltage at described first inductance two ends is equal to described bus capacitor The voltage at two ends, the electric current of described first inductance declines, and the voltage at described second inductance two ends connects equal to load The voltage at inbound port two ends, the electric current of described second inductance declines.
15. according to the High Power Factor low harmonics distortion Constant Electric Current according to any one of claim 1 to 13 Road, it is characterised in that described switching tube is power MOSFET, described first power end is institute Stating the drain electrode of mosfet transistor, described second power end is the source electrode of described mosfet transistor, Described control end is the grid of described mosfet transistor.
16. according to the High Power Factor low harmonics distortion Constant Electric Current according to any one of claim 1 to 13 Road, it is characterised in that described switching tube is pliotron, described first power end is described power three pole The colelctor electrode of pipe, described second power end is the emitter stage of described pliotron, and described control end is described The base stage of pliotron.
17. according to the High Power Factor low harmonics distortion Constant Electric Current according to any one of claim 1 to 13 Road, it is characterised in that described switching tube is source drive cubicle switch device, including a MOS crystal Pipe and the second MOS transistor, wherein, described first power end is the leakage of described first MOS transistor Pole, described second power end is the source electrode of described second MOS transistor, and described control end is described second The grid of MOS transistor, the source electrode of described first MOS transistor connects described second MOS transistor Drain electrode, the grid of described first MOS transistor receives the DC voltage preset.
18. according to the High Power Factor low harmonics distortion Constant Electric Current according to any one of claim 1 to 13 Road, it is characterised in that also include: commutator, the ac supply signal rectification to input, its positive output end Connecting described positive input terminal, its negative output terminal connects described negative input end.
19. 1 kinds of High Power Factor low harmonics distortion constant-current devices, it is characterised in that including:
High-power-factor low-harmonic-distortconstant constant current circuit according to any one of claim 1 to 18;
Current constant control driver, the sampling of its current sample end obtains the current information of described sampling resistor, described Current constant control driver produces for turning off driving of described switching tube according to the current information of described sampling resistor Dynamic signal is to realize constant output current.
20. High Power Factor low harmonics distortion constant-current devices according to claim 19, its feature exists In, the current sample end of described current constant control driver connects the first end of described sampling resistor, described sampling Second end ground connection of resistance;Or, the current sample end of described current constant control driver connects described sampling electricity Second end of resistance, the first end ground connection of described sampling resistor.
21. High Power Factor low harmonics distortion constant-current devices according to claim 19, its feature exists In, described current constant control driver also has zero passage detection end, and this zero passage detection end obtains described second inductance Current over-zero information, described current constant control driver produces according to the current over-zero information of described second inductance For turning on the driving signal of described switching tube to realize output no-load protection.
22. High Power Factor low harmonics distortion constant-current devices according to claim 21, its feature exists In, the zero passage detection end of described current constant control driver via the of resistance pressure-dividing network and described second inductance Two ends are connected, and wherein, the input of described resistance pressure-dividing network connects the second end of described second inductance, institute The outfan stating resistance pressure-dividing network connects the zero passage detection end of described current constant control driver.
23. High Power Factor low harmonics distortion constant-current devices according to claim 21, its feature exists In, also include: with the auxiliary winding of described second inductive, described zero passage detection end connect this auxiliary around First end of group, the second end ground connection of this auxiliary winding.
24. High Power Factor low harmonics distortion constant-current devices according to claim 21, its feature exists In, also include: with the auxiliary winding of described second inductive, described zero passage detection end is via electric resistance partial pressure Network is connected with the first end of described auxiliary winding, the second end ground connection of described auxiliary winding, wherein, described The input of resistance pressure-dividing network connects the first end of described auxiliary winding, the output of described resistance pressure-dividing network End connects the zero passage detection end of described current constant control driver.
25. High Power Factor low harmonics distortion constant-current devices according to claim 19, its feature exists In, described High-power-factor low-harmonic-distortconstant constant current circuit is the electricity according to any one of claim 4 to 9 Road, described current constant control driver also has peak point current current limliting end, this peak point current current limliting end and described peak First end of value sampling resistor is connected to obtain peak current information, and described current constant control driver is according to described Current information and peak current information produce described driving signal.
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