CN101834541B - Constant current circuit with high power factor - Google Patents
Constant current circuit with high power factor Download PDFInfo
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- CN101834541B CN101834541B CN2010101922037A CN201010192203A CN101834541B CN 101834541 B CN101834541 B CN 101834541B CN 2010101922037 A CN2010101922037 A CN 2010101922037A CN 201010192203 A CN201010192203 A CN 201010192203A CN 101834541 B CN101834541 B CN 101834541B
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a constant current circuit with a high power factor, which comprises a rectifier bridge, a Buck-type PFC (Power Factor Correction) main circuit, a Buck-type PFC main circuit output voltage control circuit, a Buck-type PFC controller and a DC/DC converting circuit. The rectifier bridge is used for rectifying an AC input voltage into a rectified voltage and outputting the rectified voltage to the Buck-type PFC main circuit which is used for receiving a feedback signal of the Buck-type PFC controller, correcting the power factor of the rectified voltage under the control of the feedback signal and outputting a DC voltage to the DC/DC converting circuit, the Buck-type PFC main circuit output voltage control circuit is used for sampling the output voltage of the DC/DC converting circuit and outputting a control signal to the Buck-type PFC controller which is used for outputting a feedback signal by the control signal, and the DC/DC converting circuit is used for carrying out the DC/DC conversion of a DC voltage output by the Buck-type PFC main circuit and supplying a constant current to an LED (Light-Emitting Diode) load. The circuit can select a device bearing a lower voltage so as to decrease the cost.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly a kind of constant current circuit with high power factor.
Background technology
At present in the constant-current circuit relatively more commonly used a kind of be APFC (PFC, Power factor Correction)+DC/DC converter circuit, pfc circuit is used for the adjusting of power factor, improves the operating efficiency of power supply.
Referring to Fig. 1, this figure is the constant-current circuit that is comprised of pfc circuit and DC/DC converter in the prior art.
This constant-current circuit comprises rectifier bridge 101, PFC main circuit 102, isolation DC/DC converter 103, PFC bus control circuit 104 and pfc controller 105.
Rectifier bridge 101 with AC-input voltage Vac rectification after output commutating voltage Vdc to PFC main circuit 102.
The feedback voltage signal that PFC main circuit 102 receives from pfc controller 105 is through the backward isolation of power factor correction DC/DC converter 103 output dc voltage Vbus.
Isolation DC/DC converter 103 carries out the backward LED load of DC/DC conversion output voltage V o with direct voltage Vbus, and controls for the LED load provides constant current.
The control signal that pfc controller 105 receives from PFC bus control circuit 104 is to PFC main circuit 102 output feedback voltage signals.
PFC bus control circuit 104 is used for the output voltage V o of isolation DC/DC converter 103 or the equivalent voltage of output voltage are sampled, the feedback voltage signal of output control signal control pfc controller 105 outputs, the direct voltage Vbus of realization PFC principal voltage 102 outputs changes with the output voltage V o of isolation DC/DC converter 103.
At present, PFC main circuit 102 adopts booster type Boost circuit usually, the output voltage of booster type circuit changes along with the output voltage of isolation DC/DC converter 103, the operating efficiency of power supply can be provided like this, but because the output voltage of booster type circuit is higher than input voltage, when being used for the higher wide output voltage range occasion of input voltage, will cause the Boost circuit output voltage far above input voltage, high pressure will cause whole circuit devcie to choose difficulty, and cost is high.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of constant current circuit with high power factor, can reduce output voltage, and circuit devcie is chosen simply.
The invention provides a kind of constant current circuit with high power factor, comprising: rectifier bridge, Buck type PFC main circuit, Buck type pfc controller, Buck type PFC main circuit output voltage controlling circuit and DC/DC translation circuit;
Rectifier bridge, being used for the AC-input voltage rectification is that commutating voltage is defeated by Buck type PFC main circuit;
Buck type PFC main circuit be used for to receive the feedback signal of Buck type pfc controller, after under the control of described feedback signal described commutating voltage being carried out power factor correction to DC/DC translation circuit output dc voltage;
Buck type PFC main circuit output voltage controlling circuit, be used for the output voltage of DC/DC translation circuit or the equivalent voltage of output voltage are sampled, the output control signal is to Buck type pfc controller, also be used for direct voltage is sampled, will be to the sampled signal of direct voltage with to the sampled signal of the output voltage rear output control signal that superposes; Described Buck type PFC main circuit output voltage controlling circuit comprises the first sampling resistor, the second sampling resistor, triode, the 3rd resistance, voltage control loop, output voltage sampling winding, the 4th diode, the 4th electric capacity and output voltage sampling processing module; Be connected in parallel on the two ends of the first electric capacity after described the first sampling resistor and the series connection of the second sampling resistor, be used for the sampling direct voltage; The voltage of the first sampling resistor and the second sampling resistor common port is as the input of voltage control loop; Output voltage sampling winding is the auxiliary winding of transformer in the DC/DC converter, one end of auxiliary winding connects the anode of the 4th diode, the negative electrode of described the 4th diode connects an end of the 4th electric capacity, the other end ground connection of the other end of the 4th electric capacity and auxiliary winding, the voltage of the negative electrode output of the 4th diode is as the sampled voltage of output voltage; Output voltage sampling processing module, for the base stage of exporting to triode after the sampled voltage of output voltage is processed, voltage on the collector electrode of triode is as the input of voltage control loop, and the emitter of triode connects accessory power supply Vcc by the 3rd resistance; Voltage control loop comprises amplifier and compensating network, the negative input end of described amplifier connects the output of amplifier by compensating network, the output of described amplifier connects the input of Buck type pfc controller, described the first sampling resistor be connected the common port of sampling resistor and connect the negative input end of described amplifier, the collector electrode of described triode connects the negative input end of described amplifier, and the positive input terminal of described amplifier connects reference voltage;
Buck type pfc controller is used for by described control signal output feedback signal, and described feedback signal is used for control Buck type PFC main circuit, so that the direct voltage of Buck type PFC main circuit output changes consistent with the output voltage of DC/DC translation circuit;
The DC/DC translation circuit is used for that the direct voltage that Buck type PFC main circuit is exported is carried out the backward LED load of DC/DC conversion and carries out constant current-supplying.
Preferably, described Buck type PFC main circuit comprises: the first inductance, the first switching tube, the first diode and the first electric capacity;
The positive output end of rectifier bridge is the first switching tube first end and the second end, the first inductance and the first capacity earth by connecting successively;
The negative electrode of the first diode connects the common port of the first switching tube and the first inductance, the plus earth of the first diode;
The output of Buck type pfc controller connects the 3rd end of the first switching tube, controls the closed and disconnected of the first switching tube.
Preferably, described output voltage sampling processing module comprises the 3rd integrated transporting discharging,
The reverse input end of described the 3rd integrated transporting discharging connects the output of described the 3rd integrated transporting discharging, and the positive input of the 3rd integrated transporting discharging connects the negative electrode of described the 4th diode and the common port of described the 4th electric capacity.
Preferably, described DC/DC translation circuit comprises DC/DC converter, DC/DC controller and DC/DC current regulator;
The input of described DC/DC converter connects the output of Buck type PFC main circuit, is used for carrying out constant current control power supply to the LED load after the direct voltage of under the control of DC/DC controller Buck type PFC main circuit being exported carries out the DC/DC conversion;
The DC/DC current regulator is used for gathering the current signal in the LED load, and described current signal is fed back to the DC/DC controller;
The DC/DC controller is used for the closed and shutoff according to described current signal control DC/DC converter switch.
Preferably, described DC/DC converter is LLC resonant transform circuit, asymmetrical half-bridge translation circuit, symmetrical half bridge translation circuit, full-bridge circuit, push-pull circuit, forward conversion circuit or inverse-excitation converting circuit.
Preferably, when described DC/DC converter is the LLC resonant transform circuit, comprising: second switch pipe, the 3rd switching tube, the second inductance, the second electric capacity, transformer, rectification module and the 3rd electric capacity;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe and the series connection of the 3rd switching tube;
The common port of described second switch pipe and the 3rd switching tube is successively by the second inductance of series connection and Same Name of Ends or the different name end of the armature winding of the second electric capacity connection transformer;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
Preferably, when described DC/DC converter is the asymmetrical half-bridge translation circuit, comprising: second switch pipe, the 3rd switching tube, the second electric capacity, transformer, rectification module and the 3rd electric capacity;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe and the series connection of the 3rd switching tube;
The common port of described second switch pipe and the 3rd switching tube is by Same Name of Ends or the different name end of the second electric capacity connection transformer armature winding;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
Preferably, when described DC/DC converter is the symmetrical half bridge translation circuit, comprising: second switch pipe, the 3rd switching tube, the second electric capacity, the 4th electric capacity, transformer, rectification module and the 3rd electric capacity;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe and the series connection of the 3rd switching tube;
Be connected in parallel on the output of described Buck type PFC main circuit after the 4th capacitances in series of described the second electric capacity and described symmetrical half bridge translation circuit;
One end of the common port connection transformer armature winding of described second switch pipe and the 3rd switching tube;
Described the second electric capacity be connected the common port of the 4th electric capacity of symmetrical half bridge translation circuit and connect the other end of described primary winding;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
Preferably, when described DC/DC converter is full-bridge circuit, comprising: second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, transformer, rectification module and the 3rd electric capacity;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe and the series connection of the 3rd switching tube;
Be connected in parallel on the output of described Buck type PFC main circuit after described the 4th switching tube and the series connection of the 5th switching tube;
One end of the armature winding of the common port connection transformer of described second switch pipe and the 3rd switching tube;
The other end of the armature winding of the common port connection transformer of described the 4th switching tube and the 5th switching tube;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
Preferably, when described DC/DC converter is push-pull circuit, comprising: second switch pipe, the 3rd switching tube, transformer, rectification module and the 3rd electric capacity;
The positive output end of described Buck type PFC main circuit is by the Same Name of Ends of second switch pipe connection transformer armature winding, by the different name end of the 3rd switching tube connection transformer armature winding;
The centre cap of the negative output terminal connection transformer armature winding of described Buck type PFC main circuit;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
Preferably, when described DC/DC converter is the forward conversion circuit, comprising: second switch pipe, reset circuit, transformer, the second diode and the 3rd diode, the second inductance and the 3rd electric capacity;
The Same Name of Ends of the positive output end connection transformer armature winding of described Buck type PFC main circuit, the different name end of primary winding connect the negative output terminal of described Buck type PFC main circuit by the second switch pipe;
Described reset circuit is parallel to the two ends of described primary winding;
The secondary winding Same Name of Ends of described transformer connects the anode of the second diode, another termination output negative terminal;
The negative electrode of described the second diode connects negative electrode and the 3rd electric capacity anode of the 3rd diode, and the anode of the 3rd electric capacity negative terminal and the 3rd diode all connects the output negative terminal.
Preferably, when described DC/DC converter is inverse-excitation converting circuit, comprising: second switch pipe, transformer, the second diode and the 3rd electric capacity;
The Same Name of Ends of the positive output end connection transformer armature winding of described Buck type PFC main circuit; The different name end of primary winding connects the negative output terminal of Buck type PFC main circuit by the second switch pipe;
The different name end of described transformer secondary output winding connects the Same Name of Ends of secondary winding successively by the second diode and the 3rd electric capacity.
Compared with prior art, the present invention has the following advantages:
What the constant current circuit with high power factor that present embodiment provides adopted is the constant-current circuit of voltage-dropping type Buck Active Power Factor Correction function, the output voltage that this constant-current circuit is followed the DC/DC translation circuit by the output voltage of regulating Buck type PFC main circuit changes, work in wider output voltage range duty ratio or operating frequency of DC/DC translation circuit remained unchanged substantially, thereby make the DC/DC translation circuit be operated in the state of efficiency optimization, can make like this DC/DC translation circuit keep higher operating efficiency.Because the PFC main circuit in this constant-current circuit adopts Buck type reduction voltage circuit, its input voltage is can specific output voltage high, can be applied to the occasion of the higher wide output voltage range of input voltage, because output voltage is lower than input voltage, therefore circuit can be chosen the device that bears low voltage, can reduce cost like this.
Description of drawings
Fig. 1 is the constant-current circuit that is comprised of pfc circuit and DC/DC converter in the prior art;
Fig. 2 is constant current circuit with high power factor embodiment one structure chart provided by the invention;
Fig. 3 is constant current circuit with high power factor embodiment two structure charts provided by the invention;
Fig. 4 is constant current circuit with high power factor embodiment three structure charts provided by the invention;
Fig. 5 is constant current circuit with high power factor embodiment four structure charts provided by the invention;
Fig. 6 is constant current circuit with high power factor embodiment five structure charts provided by the invention;
Fig. 7 is constant current circuit with high power factor embodiment six structure charts provided by the invention;
Fig. 8 is constant current circuit with high power factor embodiment seven structure charts provided by the invention;
Fig. 9 is constant current circuit with high power factor embodiment eight structure charts provided by the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
Referring to Fig. 2, this figure is constant current circuit with high power factor embodiment one structure chart provided by the invention.
The constant current circuit with high power factor that present embodiment provides comprises: rectifier bridge 201, Buck type PFC main circuit 202, Buck type pfc controller 205, Buck type PFC main circuit output voltage controlling circuit 204 and DC/DC translation circuit 203.
Buck type PFC main circuit 202 be used for to receive the feedback signal of Buck type pfc controller 205, after under the control of described feedback signal described commutating voltage Vdc being carried out power factor correction to DC/DC translation circuit 203 output dc voltage Vbus;
Buck type PFC main circuit output voltage controlling circuit 204 is used for the output voltage V o of DC/DC translation circuit 203 or the equivalent voltage of output voltage V o are sampled, and the output control signal is to Buck type pfc controller 205;
Buck type pfc controller 205, be used for by described control signal output feedback signal, described feedback signal is used for control Buck type PFC main circuit 202, so that the direct voltage Vbus of Buck type PFC main circuit 202 outputs is consistent with the variation of the output voltage V o of DC/DC translation circuit 203;
DC/DC translation circuit 203 is used for that the direct voltage Vbus that Buck type PFC main circuit 202 is exported is carried out the backward LED load of DC/DC conversion and carries out constant current-supplying.
What the constant current circuit with high power factor that present embodiment provides adopted is the constant-current circuit of voltage-dropping type Buck Active Power Factor Correction function, because the PFC main circuit in this constant-current circuit adopts Buck type reduction voltage circuit, its input voltage specific output voltage is high, therefore, the occasion of the higher wide output voltage range of input voltage can be applied to, and the cost of Buck type PFC main circuit needn't be increased.The output voltage that this constant-current circuit is followed the DC/DC translation circuit by the output voltage of regulating Buck type PFC main circuit changes, work in wider output voltage range duty ratio or operating frequency of DC/DC translation circuit remained unchanged substantially, thereby make the DC/DC translation circuit be operated in the state of efficiency optimization, can make like this DC/DC translation circuit keep higher operating efficiency.
The DC/DC translation circuit that the embodiment of the invention provides comprises: DC/DC converter, DC/DC controller and DC/DC current regulator;
The input of described DC/DC converter connects the output of Buck type PFC main circuit, is used for carrying out constant current control power supply to the LED load after the direct voltage of under the control of DC/DC controller Buck type PFC main circuit being exported carries out DC/DC conversion conversion;
The DC/DC current regulator is used for gathering the current signal in the LED load, and described current signal is fed back to the DC/DC controller;
The DC/DC controller is used for the closed and shutoff according to described current signal control DC/DC converter switch.
Need to prove that the DC/DC converter in the embodiment of the invention can be LLC resonant transform circuit, asymmetrical half-bridge translation circuit, symmetrical half bridge translation circuit, full-bridge circuit, push-pull circuit, forward conversion circuit or inverse-excitation converting circuit.Constant-current circuit when introducing respectively the DC/DC converter and be various topological circuit below in conjunction with accompanying drawing.
Referring to Fig. 3, this figure is constant current circuit with high power factor embodiment two structure charts provided by the invention.
DC/DC converter 203a in the constant-current circuit that present embodiment provides is the LLC resonant transform circuit.
Paper Buck type PFC main circuit 202 comprises: the first inductance L 1, the first switching tube S1, the first diode D1 and the first capacitor C 1.
The positive output end of rectifier bridge is the first switching tube first end and the second end, the first inductance and the first capacity earth by connecting successively;
The negative electrode of the first diode connects the common port of the first switching tube and the first inductance, the plus earth of the first diode;
The output of Buck type pfc controller connects the 3rd end of the first switching tube, controls the closed and disconnected of the first switching tube.
The below introduces Buck type PFC main circuit output voltage controlling circuit 204.
Described Buck type PFC main circuit output voltage controlling circuit 204 also is used for direct voltage Vbus is sampled, will be to the sampled signal of direct voltage Vbus with to the sampled signal of the output voltage V o rear output control signal that superposes.
Described Buck type PFC main circuit output voltage controlling circuit 204 comprises the first sampling resistor R1, the second sampling two resistance R 2, triode Q1, the 3rd resistance R 3, voltage control loop, output voltage sampling winding and output voltage sampling processing module;
Be connected in parallel on the two ends of the first capacitor C 1 after described the first sampling resistor R1 and the second sampling resistor R2 series connection;
The voltage of the first sampling resistor R1 and the second sampling resistor R2 common port is as the input of voltage control loop;
Output voltage sampling winding is the auxiliary winding of transformer in the DC/DC converter, and the voltage Voi on the auxiliary winding is as the sampled voltage of output voltage;
Output voltage sampling processing module is used for exporting to after sampled voltage Voi with output voltage processes the base stage of triode Q1, and the voltage on the collector electrode of triode Q1 is as the input of voltage control loop;
The output of voltage control loop connects the input of Buck type pfc controller 205.
Need to prove, output voltage sampling processing module, comprise the 3rd integrated transporting discharging IC3, the 3rd integrated transporting discharging IC3 is connected to the form of voltage follower, namely the reverse input end of the 3rd integrated transporting discharging IC3 connects the negative electrode of the 4th diode D4 and the output of the 3rd integrated transporting discharging IC3, and the positive input of the 3rd integrated transporting discharging IC3 connects the input of output voltage sampling winding.
Need to prove that triode Q1 is preferably the PNP pipe.The emitter of PNP pipe Q1 meets Vcc by the 3rd resistance R 3.
The Same Name of Ends of the auxiliary winding of transformer T1 is through the input of the 4th diode D4 connection output voltage sampling processing module, and the different name end connects the input of output voltage sampling processing module by the 4th electric capacity.
Need to prove that the voltage control loop that present embodiment provides comprises amplifier IC2 and compensating network;
The negative input end of amplifier IC2 is by the output of compensating network connection amplifier IC2, and the output of amplifier IC2 connects the input of Buck type pfc controller 205.
The first sampling resistor R1 be connected the common port of sampling resistor R2 and connect the negative input end of amplifier IC2.
The collector electrode of PNP pipe Q1 also connects the negative input end of amplifier IC2.
The positive input termination reference voltage Vref 1 of amplifier IC2.
The below introduces the concrete structure of LLC resonant transform circuit.
The LLC resonant transform circuit comprises: second switch pipe S2, the 3rd switching tube S3, the second inductance L 2, the second capacitor C 2, transformer T1, rectification module and the 3rd capacitor C 3;
Be connected in parallel on the output of described Buck type PFC main circuit 202 after described second switch pipe S2 and the 3rd switching tube S3 series connection;
The common port of described second switch pipe S2 and the 3rd switching tube S3 is successively by the second inductance L 2 of series connection and Same Name of Ends or the different name end of the armature winding of the second capacitor C 2 connection transformer T1;
The secondary winding of described transformer T1 connects rectification module;
Described the 3rd capacitor C 3 is connected in parallel on the output of described rectification module.
Need to prove that described rectification module is comprised of the second diode D2 and the 3rd diode D3.
Wherein, the Same Name of Ends of the secondary winding of the anodic bonding transformer T1 of the second diode D2, negative electrode connects the anode of LED load.
The different name end of the secondary winding of the 3rd diode D3 anodic bonding transformer T1, negative electrode connects the anode of LED load.
One end of the 3rd capacitor C 3 connects the anode of LED load, the centre cap of other end connection transformer T1 secondary winding.
Because the DC/DC converter that present embodiment provides is the LLC resonant transform circuit, the input voltage Vbus of DC/DC converter follows the direct voltage that its output voltage V o changes, in wider output voltage range, the LLC resonant transform circuit can be operated near the resonance frequency, therefore the gain ranging of resonant element reduces, operating frequency range dwindles, can make the DC/DC converter in wide output voltage range, realize higher operating efficiency, in addition, under the effect of some DC/DC controller, can realize that also the work duty ratio of DC/DC converter remains unchanged in the very wide scope of output voltage.
And, under the effect of DC/DC current regulator 203c and DC/DC controller 203b, the output of DC/DC converter 203a realizes the Constant Current Load characteristic, and because DC/DC current regulator 203c is independent of Buck type pfc controller and loop control, therefore, the fast response time of DC/DC current regulator 203c, adaptable to the load dynamic change; DC/DC converter 203a output voltage V o reduces, and the input voltage Vbus of DC/DC converter 203a also follows reduction, thus the power factor of Buck type PFC main circuit and reduce input harmonic current in the time of can improving low pressure output.
The embodiment of the invention provides the various topological circuits of DC/DC converter, introduced respectively below in conjunction with accompanying drawing and since the circuit of other parts with embodiment illustrated in fig. 3 in identical, therefore, following examples will repeat no more, and only introduce the topological structure of different DC/DC converters.
Referring to Fig. 4, this figure is constant current circuit with high power factor embodiment three structure charts provided by the invention.
The DC/DC converter 203a that present embodiment provides is the asymmetrical half-bridge translation circuit, comprising: second switch pipe S2, the 3rd switching tube S3, the second capacitor C 2, transformer T1, rectification module and the 3rd capacitor C 3;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe S2 and the 3rd switching tube S3 series connection;
The common port of described second switch pipe S2 and the 3rd switching tube S3 is by Same Name of Ends or the different name end of the second capacitor C 2 connection transformer T1 armature windings;
The secondary winding of described transformer T1 connects rectification module;
Described the 3rd capacitor C 3 is connected in parallel on the output of described rectification module.
Rectification module among this embodiment is identical with rectification module in the LLC resonant transform circuit shown in Figure 3, does not repeat them here.
Referring to Fig. 5, this figure is constant current circuit with high power factor embodiment four structure charts provided by the invention.
The DC/DC converter 203a that present embodiment provides is the symmetrical half bridge translation circuit, comprising: second switch pipe S2, the 3rd switching tube S3, the second capacitor C 2, the 4th capacitor C 4, transformer T1, rectification module and the 3rd capacitor C 3;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe S2 and the 3rd switching tube S3 series connection;
Be connected in parallel on the output of described Buck type PFC main circuit after described the second capacitor C 2 and 4 series connection of the 4th capacitor C;
The different name end of the common port connection transformer T1 armature winding of described second switch pipe S2 and the 3rd switching tube S3;
The common port of described the second capacitor C 2 and the 4th capacitor C 4 connects the Same Name of Ends of described transformer T1 armature winding;
The secondary winding of described transformer T1 connects rectification module;
Described the 3rd capacitor C 3 is connected in parallel on the output of described rectification module.
Rectification module among this embodiment is identical with rectification module in the LLC resonant transform circuit shown in Figure 3, does not repeat them here.
Referring to Fig. 6, this figure is constant current circuit with high power factor embodiment five structure charts provided by the invention.
The DC/DC converter 203a that present embodiment provides is full-bridge circuit, comprising: second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4, the 5th switching tube S5, transformer T1, rectification module and the 3rd capacitor C 3;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe S2 and the 3rd switching tube S3 series connection;
Be connected in parallel on the output of described Buck type PFC main circuit after described the 4th switching tube S4 and the 5th switching tube S5 series connection;
One end of the armature winding of the common port connection transformer T1 of described second switch pipe S2 and the 3rd switching tube S3;
The other end of the armature winding of the common port connection transformer T1 of described the 4th switching tube S4 and the 5th switching tube S5;
The secondary winding of described transformer T1 connects rectification module;
Described the 3rd capacitor C 3 is connected in parallel on the output of described rectification module.
Rectification module among this embodiment is identical with rectification module in the LLC resonant transform circuit shown in Figure 3, does not repeat them here.
Referring to Fig. 7, this figure is constant current circuit with high power factor embodiment six structure charts provided by the invention.
The DC/DC converter 203a that present embodiment provides is push-pull circuit, comprising: second switch pipe S2, the 3rd switching tube S3, transformer T1, rectification module and the 3rd capacitor C 3;
The positive output end of described Buck type PFC main circuit is by an end of second switch pipe S2 connection transformer T1 armature winding, by the other end of the 3rd switching tube S3 connection transformer T1 armature winding;
The centre cap of the negative output terminal connection transformer T1 armature winding of described Buck type PFC main circuit;
The secondary winding of described transformer T1 connects rectification module;
Described the 3rd capacitor C 3 is connected in parallel on the output of described rectification module.
Rectification module among this embodiment is identical with rectification module in the LLC resonant transform circuit shown in Figure 3, does not repeat them here.
Referring to Fig. 8, this figure is constant current circuit with high power factor embodiment seven structure charts provided by the invention.
The DC/DC converter 203a that present embodiment provides is the forward conversion circuit, comprising: second switch pipe S2, reset circuit, transformer T1, the second diode D2 and the 3rd diode D3, the second inductance L 2 and the 3rd capacitor C 3;
The Same Name of Ends of the positive output end connection transformer T1 armature winding of described Buck type PFC main circuit, the different name end of transformer T1 armature winding connect the negative output terminal of described Buck type PFC main circuit by second switch pipe S2;
Described reset circuit is parallel to the two ends of described transformer T1 armature winding;
The secondary winding of described transformer T1 connects rectification module;
The Same Name of Ends of the secondary winding of the anodic bonding transformer T1 of described the second diode D2, negative electrode connects an end of the second inductance L 2.
The negative electrode of the second diode D2 also connects the negative electrode of the 3rd diode D3, the different name end of the secondary winding of the anodic bonding transformer T1 of the 3rd diode D3.
The 3rd capacitor C 3 is connected in parallel on the other end of the second inductance L 2.
The LED load is connected in parallel on the 3rd capacitor C 3 two ends.
In the described embodiment of Fig. 8, Voi voltage from the coupling winding W of transformer secondary inductance L
L
Because the input voltage Vbus of DC/DC converter follows the direct voltage that output voltage V o changes, in wider output voltage range, the DC/DC converter can be operated in duty ratio and approach the state that remains unchanged.Therefore the excursion of DC/DC converter work duty ratio can be dwindled greatly, thus the Effective Raise operating efficiency.
Referring to Fig. 9, this figure is constant current circuit with high power factor embodiment eight structure charts provided by the invention.
The DC/DC converter 203a that present embodiment provides is inverse-excitation converting circuit, comprising: second switch pipe S2, transformer T1, the second diode D2 and the 3rd capacitor C 3;
The Same Name of Ends of the positive output end connection transformer T1 armature winding of described Buck type PFC main circuit; The different name end of transformer T1 armature winding connects the negative output terminal of Buck type PFC main circuit by second switch pipe S2;
The different name end of described transformer T1 secondary winding passes through the Same Name of Ends of the second diode D2 and the 3rd capacitor C 3 connection transformer T1 secondary winding successively.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet is not to limit the present invention.Any those of ordinary skill in the art, do not breaking away from the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
Claims (12)
1. a constant current circuit with high power factor is characterized in that, comprising: rectifier bridge, Buck type PFC main circuit, Buck type pfc controller, Buck type PFC main circuit output voltage controlling circuit and DC/DC translation circuit;
Rectifier bridge, being used for the AC-input voltage rectification is that commutating voltage is defeated by Buck type PFC main circuit;
Buck type PFC main circuit be used for to receive the feedback signal of Buck type pfc controller, after under the control of described feedback signal described commutating voltage being carried out power factor correction to DC/DC translation circuit output dc voltage;
Buck type PFC main circuit output voltage controlling circuit, be used for the output voltage of DC/DC translation circuit or the equivalent voltage of output voltage are sampled, the output control signal is to Buck type pfc controller, also be used for direct voltage is sampled, will be to the sampled signal of direct voltage with to the sampled signal of the output voltage rear output control signal that superposes; Described Buck type PFC main circuit output voltage controlling circuit comprises the first sampling resistor, the second sampling resistor, triode, the 3rd resistance, voltage control loop, output voltage sampling winding, the 4th diode, the 4th electric capacity and output voltage sampling processing module; Be connected in parallel on the two ends of the first electric capacity after described the first sampling resistor and the series connection of the second sampling resistor, be used for the sampling direct voltage; The voltage of the first sampling resistor and the second sampling resistor common port is as the input of voltage control loop; Output voltage sampling winding is the auxiliary winding of transformer in the DC/DC converter, one end of auxiliary winding connects the anode of the 4th diode, the negative electrode of described the 4th diode connects an end of described the 4th electric capacity, the other end ground connection of the other end of the 4th electric capacity and auxiliary winding, the voltage of the negative electrode output of the 4th diode is as the sampled voltage of output voltage; Output voltage sampling processing module, for the base stage of exporting to triode after the sampled voltage of output voltage is processed, voltage on the collector electrode of triode is as the input of voltage control loop, and the emitter of triode connects accessory power supply Vcc by the 3rd resistance; Voltage control loop comprises amplifier and compensating network, the negative input end of described amplifier connects the output of amplifier by compensating network, the output of described amplifier connects the input of Buck type pfc controller, described the first sampling resistor be connected the common port of sampling resistor and connect the negative input end of described amplifier, the collector electrode of described triode connects the negative input end of described amplifier, and the positive input terminal of described amplifier connects reference voltage;
Buck type pfc controller is used for by described control signal output feedback signal, and described feedback signal is used for control Buck type PFC main circuit, so that the direct voltage of Buck type PFC main circuit output changes consistent with the output voltage of DC/DC translation circuit;
The DC/DC translation circuit is used for that the direct voltage that Buck type PFC main circuit is exported is carried out the backward LED load of DC/DC conversion and carries out constant current-supplying.
2. constant current circuit with high power factor according to claim 1 is characterized in that, described Buck type PFC main circuit comprises: the first inductance, the first switching tube, the first diode and the first electric capacity;
The positive output end of rectifier bridge is the first switching tube first end and the second end, the first inductance and the first capacity earth by connecting successively;
The negative electrode of the first diode connects the common port of the first switching tube and the first inductance, the plus earth of the first diode;
The output of Buck type pfc controller connects the 3rd end of the first switching tube, controls the closed and disconnected of the first switching tube.
3. constant current circuit with high power factor according to claim 1 is characterized in that, described output voltage sampling processing module comprises the 3rd integrated transporting discharging,
The reverse input end of described the 3rd integrated transporting discharging connects the output of described the 3rd integrated transporting discharging, and the positive input of the 3rd integrated transporting discharging connects the negative electrode of described the 4th diode and the common port of described the 4th electric capacity.
4. constant current circuit with high power factor according to claim 1 is characterized in that, described DC/DC translation circuit comprises DC/DC converter, DC/DC controller and DC/DC current regulator;
The input of described DC/DC converter connects the output of Buck type PFC main circuit, is used for carrying out constant current control power supply to the LED load after the direct voltage of under the control of DC/DC controller Buck type PFC main circuit being exported carries out the DC/DC conversion;
The DC/DC current regulator is used for gathering the current signal in the LED load, and described current signal is fed back to the DC/DC controller;
The DC/DC controller is used for the closed and shutoff according to described current signal control DC/DC converter switch.
5. constant current circuit with high power factor according to claim 4, it is characterized in that described DC/DC converter is LLC resonant transform circuit, asymmetrical half-bridge translation circuit, symmetrical half bridge translation circuit, full-bridge circuit, push-pull circuit, forward conversion circuit or inverse-excitation converting circuit.
6. constant current circuit with high power factor according to claim 5, it is characterized in that, when described DC/DC converter is the LLC resonant transform circuit, comprising: second switch pipe, the 3rd switching tube, the second inductance, the second electric capacity, transformer, rectification module and the 3rd electric capacity;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe and the series connection of the 3rd switching tube;
The common port of described second switch pipe and the 3rd switching tube is successively by the second inductance of series connection and Same Name of Ends or the different name end of the armature winding of the second electric capacity connection transformer;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
7. constant current circuit with high power factor according to claim 5 is characterized in that, when described DC/DC converter is the asymmetrical half-bridge translation circuit, comprising: second switch pipe, the 3rd switching tube, the second electric capacity, transformer, rectification module and the 3rd electric capacity;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe and the series connection of the 3rd switching tube;
The common port of described second switch pipe and the 3rd switching tube is by Same Name of Ends or the different name end of the second electric capacity connection transformer armature winding;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
8. constant current circuit with high power factor according to claim 5, it is characterized in that, when described DC/DC converter is the symmetrical half bridge translation circuit, comprising: second switch pipe, the 3rd switching tube, the second electric capacity, the 4th electric capacity, transformer, rectification module and the 3rd electric capacity;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe and the series connection of the 3rd switching tube;
Be connected in parallel on the output of described Buck type PFC main circuit after the 4th capacitances in series of described the second electric capacity and described symmetrical half bridge translation circuit;
One end of the common port connection transformer armature winding of described second switch pipe and the 3rd switching tube;
Described the second electric capacity be connected the common port of the 4th electric capacity of symmetrical half bridge translation circuit and connect the other end of described primary winding;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
9. constant current circuit with high power factor according to claim 5, it is characterized in that, when described DC/DC converter is full-bridge circuit, comprising: second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, transformer, rectification module and the 3rd electric capacity;
Be connected in parallel on the output of described Buck type PFC main circuit after described second switch pipe and the series connection of the 3rd switching tube;
Be connected in parallel on the output of described Buck type PFC main circuit after described the 4th switching tube and the series connection of the 5th switching tube;
One end of the armature winding of the common port connection transformer of described second switch pipe and the 3rd switching tube;
The other end of the armature winding of the common port connection transformer of described the 4th switching tube and the 5th switching tube;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
10. constant current circuit with high power factor according to claim 5 is characterized in that, when described DC/DC converter is push-pull circuit, comprising: second switch pipe, the 3rd switching tube, transformer, rectification module and the 3rd electric capacity;
The positive output end of described Buck type PFC main circuit is by the Same Name of Ends of second switch pipe connection transformer armature winding, by the different name end of the 3rd switching tube connection transformer armature winding;
The centre cap of the negative output terminal connection transformer armature winding of described Buck type PFC main circuit;
The secondary winding of described transformer connects rectification module;
Described the 3rd Capacitance parallel connection is at the output of described rectification module.
11. constant current circuit with high power factor according to claim 5, it is characterized in that, when described DC/DC converter is the forward conversion circuit, comprising: second switch pipe, reset circuit, transformer, the second diode and the 3rd diode, the second inductance and the 3rd electric capacity;
The Same Name of Ends of the positive output end connection transformer armature winding of described Buck type PFC main circuit, the different name end of primary winding connect the negative output terminal of described Buck type PFC main circuit by the second switch pipe;
Described reset circuit is parallel to the two ends of described primary winding;
The secondary winding Same Name of Ends of described transformer connects the anode of the second diode, another termination output negative terminal;
The negative electrode of described the second diode connects negative electrode and the 3rd electric capacity anode of the 3rd diode, and the anode of the 3rd electric capacity negative terminal and the 3rd diode all connects the output negative terminal.
12. constant current circuit with high power factor according to claim 5 is characterized in that, when described DC/DC converter is inverse-excitation converting circuit, comprising: second switch pipe, transformer, the second diode and the 3rd electric capacity;
The Same Name of Ends of the positive output end connection transformer armature winding of described Buck type PFC main circuit; The different name end of primary winding connects the negative output terminal of Buck type PFC main circuit by the second switch pipe;
The different name end of described transformer secondary output winding connects the Same Name of Ends of secondary winding successively by the second diode and the 3rd electric capacity.
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| CN2010101922037A CN101834541B (en) | 2010-06-02 | 2010-06-02 | Constant current circuit with high power factor |
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