CN106572573B - The AC/DC power circuit and its control method and method of supplying power to of compatible silicon controlled light modulation - Google Patents

The AC/DC power circuit and its control method and method of supplying power to of compatible silicon controlled light modulation Download PDF

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Publication number
CN106572573B
CN106572573B CN201610629007.9A CN201610629007A CN106572573B CN 106572573 B CN106572573 B CN 106572573B CN 201610629007 A CN201610629007 A CN 201610629007A CN 106572573 B CN106572573 B CN 106572573B
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circuit
switching
diode
current
power
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CN106572573A (en
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朱成花
崔俊国
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Shanghai Zhihong Electric Technology Co., Ltd
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Wuhu Ruixin Electronic Technology Co Ltd
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10Controlling the light source
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Abstract

The present invention provides a kind of AC/DC power circuit of compatible silicon controlled light modulation and its control method and method of supplying power to, the DC voltage that dim signal generation circuit detects rectification circuit output generate dim signal, provide current to and determine signal;Current detection circuit detects controlled electric current, provides current feedback signal;Controller generates the control signal of switching device in current limliting-constant-current circuit according to the difference of given value of current signal and current feedback signal, the variation of the DC voltage for export controlled electric current according to rectification circuit and corresponding change, realization controllable silicon light modulation.This kind of AC/DC power circuit and its control method and method of supplying power to, power device loss is extremely low, and transfer efficiency is high, easily expands the power application range of driving power;The angle of flow of rectifier bridge is increased, so that the power factor of power circuit be made to be higher than conventional rectifier circuit;Output voltage and current ripples are small;There is the preferable ability for resisting lightning surge;With good controllable silicon light modulation compatibility;It is easily integrated.

Description

The AC/DC power circuit and its control method and method of supplying power to of compatible silicon controlled light modulation
Technical field
The present invention relates to a kind of AC/DC power circuit of compatible silicon controlled light modulation and its control method and method of supplying power to.
Background technique
In recent years, high-brightness LED illumination with high photosynthetic efficiency, the long-life, high reliability and it is pollution-free the advantages that answer extensively With.LED cannot connect directly to alternating current, need to configure corresponding current limliting driving power, the scheme that current LED driving uses with Based on traditional high frequency switch power, circuit is complicated, at high cost, the linear power supply scheme so that numerous manufacturers convert.
The shortcomings that conventional linear power circuit are as follows: for a. when line voltage is higher, current-limited power device power consumption is very big, limit Stream power device temperature rise is higher, and which has limited the application power brackets of Linear Driving power supply;B. if without storage capacitor or Capacity very little, output ripple is big, and LED utilization rate is low;C. when input voltage virtual value is relatively low, current-limited power device can not reach To the purpose of constant current, so that line regulation is low;D. if there is biggish storage capacitor exists, because of the angle of flow ratio of rectifier bridge Smaller, the linear power source circuit power factor is lower.
In addition, controllable silicon light modulation is the light-dimming method being widely used at present.It, can by changing the size of thyristor operating angle The output voltage for adjusting light modulator, to change the brightness of LED.Existing linear power supply scheme will realize controllable silicon light modulation, often Performance is bad.It is even that problem can show as flashing, uneven illumination, or flashes when adjusting brightness.
Summary of the invention
The object of the present invention is to provide a kind of AC/DC power circuit of compatible silicon controlled light modulation and its control method and power supplies Method fundamentally avoids the harm of above-mentioned linear power supply.The efficiency of driving power is especially significantly improved, drive is expanded The application power bracket of dynamic power supply meets the requirement to power factor (PF), and the compatibility with good controllable silicon light modulation.
A kind of AC/DC power circuit of compatible silicon controlled light modulation, comprising:
One AC power source, provides alternating current;
One thyristor regulating optical circuit, the size by changing the angle of flow realize the adjusting of its output voltage;
One rectification circuit provides AC power source to alternating current and is converted to direct current;
One current limliting-constant-current circuit, control switch device, to control the width of the charge or discharge electric current of intermediate energy storage circuit Value or discharge time realize current limliting or output constant current;
One load circuit is connected between rectification circuit and current limliting-constant-current circuit, by AC power source and current limliting-Constant Electric Current The electric energy that road provides is converted to output energy;
The DC voltage of one dim signal generation circuit, detection rectification circuit output generates dim signal, the output signal As an input signal of controller, provides current to and determine signal;
One current detection circuit detects controlled electric current, i.e. current limliting-constant-current circuit output electric current, output signal conduct Another input of controller, provides current feedback signal;
One controller is generated in current limliting-constant-current circuit according to the difference of given value of current signal and current feedback signal and is switched The control signal of device, the variation of the DC voltage for export controlled electric current according to rectification circuit and corresponding change are realized controllably Silicon light modulation, and the control signal is provided to driving circuit;
One drive circuit generates the work of switching device in control current limliting-constant-current circuit according to the control signal received The driving signal of state.
Further, current limliting-constant-current circuit includes intermediate energy storage circuit, switching device M1, switching device M2, diode D5, diode D6, the input terminal of rectification circuit are connected with AC power source respectively, and the cathode output end of rectification circuit connects diode The anode of D5, the cathode of diode D5 pass through the anode of intermediate energy storage circuit connection diode D6, and the cathode of diode D6 passes through The cathode output end of load connection rectification circuit;
One end of switching device M1 is connected to the cathode of diode D5 and the intersection of intermediate energy storage circuit, switching device M1 The other end be connected to the cathode of diode D6 and the intersection of load, the control termination control signal of switching device M1;Switch One end of device M2 is connected to the intersection of the anode and the cathode output end of rectification circuit of diode D5, and switching device M2's is another One end is connected between the intersection of accumulator and the anode of diode D6, the control termination control signal of switching device M2.
Further, current limliting-constant-current circuit includes intermediate energy storage circuit, switching device M1, switching device M2, diode D5, diode D6, the input terminal of rectification circuit are connected with AC power source respectively, and the cathode output end of rectification circuit is connected by load The anode of diode D6 is connect, the cathode of diode D6 passes through the anode of intermediate energy storage circuit connection diode D5, diode D5's The cathode output end of cathode connection rectification circuit;
One end of switching device M1 is connected to anode and the intersection of load of diode D6, the other end of switching device M1 It is connected between the intersection of accumulator and the anode of diode D5, the control termination control signal of switching device M1;Switch One end of device M2 is connected to the cathode of diode D6 and the intersection of intermediate energy storage circuit, the other end connection of switching device M2 In the intersection of the cathode output end of the cathode and rectification circuit of diode D5, the control termination control signal of switching device M2.
Further, load circuit further includes output filter capacitor C2, and output filter capacitor C2 is in parallel with load.
Further, intermediate energy storage circuit uses storage capacitor net using intermediate energy storage capacitor C1 or intermediate energy storage circuit Network, storage capacitor network be equivalent to during charging two or more capacitors series connection, be equivalent to during electric discharge two or Multiple capacitors are in parallel.
Further, switching device M1 uses field-effect tube M1, and the drain electrode of field-effect tube M1 is connected to the negative of diode D5 The intersection of pole and intermediate energy storage circuit, the source electrode of field-effect tube M1 are connected to the cathode of diode D6 and the intersection of load, The external control signal of the grid of field-effect tube M1.
Further, switching device M2 uses field-effect tube M2, and the drain electrode of field-effect tube M2 is being connected to diode D5 just The intersection of the cathode output end of pole and rectification circuit, the source electrode of field-effect tube M2 are connected between accumulator and diode D6 Anode intersection, the external control signal of the grid of field-effect tube M2.
Further, switching device M1 uses field-effect tube M1, and the drain electrode of field-effect tube M1 is being connected to diode D6 just The intersection of pole and load, the source electrode of field-effect tube M1 are connected to the intersection of the anode and intermediate energy storage circuit of diode D5, The external control signal of the grid of field-effect tube M1.
Further, switching device M2 uses field-effect tube M2, and the drain electrode of field-effect tube M2 is connected to the negative of diode D6 The intersection of pole and intermediate energy storage circuit, the source electrode of field-effect tube M2 are connected to rectification circuit cathode output end and diode D5's The intersection of cathode pole, the external control signal of the grid of field-effect tube M2.
A kind of control method of the AC/DC power circuit of compatible silicon controlled light modulation described in any of the above-described, current feedback letter Number be lower than given value of current signal when, controller generate control signal via driving circuit control switch device M1 and/or switch The working condition of device M2, to increase C1 charge-discharge energy or input power via path diode D5- switching device M1 Or the provided energy of switching device M2- diode D6 tends to be consistent with given value of current so that controlled electric current increases;Electric current is anti- When feedback signal is higher than given value of current signal, the control signal that controller generates is via driving circuit control switch device M1 or switch Device M2 working condition, thus reduce C1 charge-discharge energy or input power via path diode D5- switching device M1 or It is the provided energy of switching device M2- diode D6, so that controlled electric current reduces, and tends to be consistent with given value of current.
Further, switching device M1 and switching device M2 is individually controlled work in linear condition or switch state.
Further, control switch device M2 work is lower than load in AC supply voltage amplitude in switch state, and only When voltage, switching device M2 conducting, remaining time turns off switching device M2;
Control switch device M1 work is lower than load voltage and intermediate energy storage in switch state, in AC supply voltage amplitude Switching device M1 is sometime opened during the difference of circuit voltage, the turn-off time of control switch device M1 is in turn according to demand Control is transmitted to the energy of output end;Switching device M1 is forced shutdown when AC supply voltage amplitude is higher than load voltage.
A kind of method of supplying power to of the AC/DC power circuit of above-mentioned compatible silicon controlled light modulation, AC power source pass through intermediate energy storage Circuit provides energy to load:
Power supply mode one: AC power source is via thyristor regulating optical circuit, rectification circuit, diode D5, intermediate energy storage circuit And diode D6 provides energy, the charging of intermediate energy storage circuit to load;
Power supply mode two: AC power source is via thyristor regulating optical circuit, rectification circuit, switching device M2, intermediate energy storage electricity Road and switching device M1 provide energy, intermediate energy storage circuit discharging to load.
Further, AC power source also timesharing or can be powered simultaneously mode three: AC power source is via controllable silicon light modulation Circuit, rectification circuit, diode D5, switching device M1 or AC power source are via thyristor regulating optical circuit, rectification circuit, switch Device M2, diode D6 provide energy to load.
Further, when AC supply voltage amplitude is higher than the sum of intermediate energy storage circuit voltage and load voltage, into confession Electric mode one;
AC supply voltage amplitude is lower than the sum of intermediate energy storage circuit voltage and load voltage and is higher than load voltage in Between accumulator difference in voltage when, into power supply mode two;
During AC supply voltage amplitude is higher than load voltage, power supply mode three can be entered.
Further, power supply mode one, power supply mode two, the other times section outside power supply mode three, rectification circuit, two poles Pipe D5, diode D6, switching device M1, switching device M2 do not work, and only output filter capacitor C2 discharges to be provided to load Energy;If without output filter capacitor C2, load current is interrupted.
The beneficial effects of the present invention are: the AC/DC power circuit and its control method of this kind of compatible silicon controlled light modulation and confession Method for electrically, power device loss is extremely low, and transfer efficiency is high, easily expands the power application range of driving power;It increases whole The angle of flow of bridge is flowed, so that the power factor of power circuit be made to be higher than conventional rectifier circuit;Output voltage and current ripples are small;Have The preferable ability for resisting lightning surge;With good controllable silicon light modulation compatibility;It is easily integrated.This kind of compatible silicon controlled tune The AC/DC power circuit of light, by directly or indirectly detecting thyristor operating angle, the correspondingly work shape of control switch device State adjusts input power via path D5-M1 or M2- to adjust the charge-discharge energy height of intermediate energy storage circuit The height of the provided energy of D6, final adjustment export size of current, realize that LED luminance is adjusted.
Detailed description of the invention
Fig. 1 is the connection schematic diagram of the AC/DC power circuit of the compatible silicon controlled light modulation of the embodiment of the present invention.
Fig. 2 is current limliting-constant-current circuit connection schematic diagram in embodiment.
Fig. 3 is the charging process schematic diagram of current limliting-constant-current circuit intermediate energy storage capacitor C1 in embodiment, wherein (a) is The positive half cycle of AC power source, (b) be AC power source negative half period.
Fig. 4 is the discharge process schematic diagram of current limliting-constant-current circuit intermediate energy storage capacitor C1 in embodiment, wherein (a) is The positive half cycle of AC power source, (b) be AC power source negative half period.
Fig. 5 is the flow diagram of the control method of the AC/DC power circuit of the compatible silicon controlled light modulation of embodiment.
Fig. 6 is another connection schematic diagram of current limliting-constant-current circuit in embodiment.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment
A kind of AC/DC power circuit of compatible silicon controlled light modulation, such as Fig. 1, comprising:
One AC power source, provides alternating current;
One thyristor regulating optical circuit, the size by changing the angle of flow realize the adjusting of its output voltage;
One rectification circuit provides AC power source to alternating current and is converted to direct current;
One current limliting-constant-current circuit, control switch device, to control the width of the charge or discharge electric current of intermediate energy storage circuit Value or discharge time realize current limliting or output constant current;
One load circuit is connected between rectification circuit and current limliting-constant-current circuit, by AC power source and current limliting-Constant Electric Current The electric energy that road provides is converted to output energy;
The DC voltage of one dim signal generation circuit, detection rectification circuit output generates dim signal, the output signal As an input signal of controller, provides current to and determine signal;
One current detection circuit detects controlled electric current, i.e. current limliting-constant-current circuit output electric current, output signal conduct Another input of controller, provides current feedback signal;
One controller is generated in current limliting-constant-current circuit according to the difference of given value of current signal and current feedback signal and is switched The control signal of device, the variation of the DC voltage for export controlled electric current according to rectification circuit and corresponding change are realized controllably Silicon light modulation, and the control signal is provided to driving circuit;
One drive circuit generates the work of switching device in control current limliting-constant-current circuit according to the control signal received The driving signal of state.
Such as Fig. 2, current limliting-constant-current circuit includes intermediate energy storage circuit, switching device M1, switching device M2, diode D5, two The input terminal of pole pipe D6, rectification circuit are connected with AC power source respectively, the cathode output end connection diode D5's of rectification circuit Anode, the cathode of diode D5 pass through the anode of intermediate energy storage circuit connection diode D6, and the cathode of diode D6 passes through load Connect the cathode output end of rectification circuit.
One end of switching device M1 is connected to the cathode of diode D5 and the intersection of intermediate energy storage circuit, switching device M1 The other end be connected to the cathode of diode D6 and the intersection of load, the control termination control signal of switching device M1;Switch One end of device M2 is connected to the intersection of the anode and the cathode output end of rectification circuit of diode D5, and switching device M2's is another One end is connected between the intersection of accumulator and the anode of diode D6, the control termination control signal of switching device M2.
Such as Fig. 5, current limliting-constant-current circuit includes intermediate energy storage circuit, switching device M1, switching device M2, diode D5, two The input terminal of pole pipe D6, rectification circuit are connected with AC power source respectively, and the cathode output end of rectification circuit passes through load connection two The anode of pole pipe D6, the cathode of diode D6 pass through the anode of intermediate energy storage circuit connection diode D5, the cathode of diode D5 Connect the cathode output end of rectification circuit.
One end of switching device M1 is connected to anode and the intersection of load of diode D6, the other end of switching device M1 It is connected between the intersection of accumulator and the anode of diode D5, the control termination control signal of switching device M1;Switch One end of device M2 is connected to the cathode of diode D6 and the intersection of intermediate energy storage circuit, the other end connection of switching device M2 In the intersection of the cathode output end of the cathode and rectification circuit of diode D5, the control termination control signal of switching device M2.
The AC/DC power circuit of this kind of compatible silicon controlled light modulation, power device loss is extremely low, and transfer efficiency is high, easily Expand the power application range of driving power.Invention increases the angles of flow of rectifier bridge, thus make the power of power circuit because Number is higher than conventional rectifier circuit.And output voltage and current ripples of the invention is small, and has the preferable energy for resisting lightning surge Power.
Load R_load can be resistive load, be also possible to other types of load, including but not limited to LED load, Switching Power Supply load or linear power supply load.It may also include output filter capacitor C2, output filter capacitor C2 is in parallel with load.It is defeated The capacitance of filter capacitor C2 can be chosen according to performance requirement out.Output filter capacitor C2 is an optional device, by output electric current Ripple requires to determine.There is no output filter capacitor C2, circuit can also work normally.
Diode D5, diode D6 provide charge circuit for intermediate energy storage capacitor C1.Switching device M1, switching device M2 are Power device, function are as follows: provide discharge path to intermediate energy storage capacitor C1 and be transmitted to according to load R_load demand control Export energy number.Under different control strategies, switching device M1, switching device M2 can work respectively in switch state or Linear condition.Diode D1, diode D2, diode D3, diode D4 are input rectifying bridge.Intermediate energy storage capacitor C1, output The capacity of filter capacitor C2 can require to choose according to actual performance.
Intermediate energy storage circuit uses storage capacitor network, storage capacitor using intermediate energy storage capacitor C1 or intermediate energy storage circuit Network is characterized in that: be equivalent to during charging two or more capacitors series connection, be equivalent to during electric discharge two or Multiple capacitors are in parallel.Fig. 6 is a kind of storage capacitor network implementations, and storage capacitor network includes capacitor C3, capacitor C4, capacitor C5, one end of capacitor C3 are connected to the intersection of the cathode of diode D7 and the anode of diode D8, and the other end of capacitor C3 connects The intersection of the cathode of diode D9 and the cathode of diode D12 is met, the one end capacitor C4 is connected to the cathode and two of diode D8 The intersection of the anode of grade pipe D9, the other end of capacitor C4 are connected to the friendship of the cathode of diode D10 and the anode of diode D11 At remittance, one end of capacitor C5 is connected to the intersection of the cathode of diode D11 and the anode of diode D12, and capacitor C5's is another End is connected to the intersection of the anode of diode D10 and the anode of diode D7.
As shown in Fig. 2, field-effect tube M1 can be used in switching device M1, the drain electrode of field-effect tube M1 is connected to diode D5's The intersection of cathode and intermediate energy storage circuit, the source electrode of field-effect tube M1 are connected to the cathode of diode D6 and crossing for load Place, the external control signal of the grid of field-effect tube M1.
As shown in Fig. 2, field-effect tube M2 can be used in switching device M2, the drain electrode of field-effect tube M2 is connected to diode D5's The intersection of anode and the cathode output end of rectification circuit, the source electrode of field-effect tube M2 are connected between accumulator and diode The intersection of the anode of D6, the external control signal of the grid of field-effect tube M2.
As shown in fig. 6, field-effect tube M1 can be used in switching device M1, the drain electrode of field-effect tube M1 is connected to diode D6's The intersection of anode and load, the source electrode of field-effect tube M1 are connected to the anode of diode D5 and crossing for intermediate energy storage circuit Place, the external control signal of the grid of field-effect tube M1.
As shown in fig. 6, field-effect tube M2 can be used in switching device M2, the drain electrode of field-effect tube M2 is connected to diode D6's The intersection of cathode and intermediate energy storage circuit, the source electrode of field-effect tube M2 are connected to rectification circuit cathode output end and diode D5 Cathode pole intersection, the external control signal of the grid of field-effect tube M2.
The AC/DC power circuit of this kind of compatible silicon controlled light modulation has good controllable silicon light modulation compatibility.By direct Or thyristor operating angle is detected indirectly, the correspondingly working condition of control switch device M1 and/or switching device M2, to adjust The charge-discharge energy height of intermediate energy storage capacitor C1, adjusts input power via the provided energy of path D5-M1 or M2-D6 The height of amount, final adjustment export size of current, realize that LED luminance is adjusted.
A kind of control method of the AC/DC power circuit of above-mentioned compatible silicon controlled light modulation, such as Fig. 5, dim signal generate electricity Road generates dim signal by detection rectification output DC voltage, and an input signal of the output signal as controller mentions For electric current Setting signal.Current detection circuit detects controlled electric current, such as output electric current, and output signal is as the another of controller One input, provides current feedback signal.Controller can be a comparison circuit or operational amplifier circuit, according to given value of current signal with The difference of current feedback signal generates control signal, and provides the control signal to driving circuit.Current feedback signal is lower than electricity When flowing Setting signal, the control signal of generation via driving circuit control switch device M1 and/or switching device M2 working condition, To increase intermediate energy storage capacitor C1 charge-discharge energy input power via path diode D5- switching device M1 or open The there is provided energy of device M2- diode D6 is provided, so that controlled electric current increases, tends to be consistent with given value of current;Current feedback signal When higher than given value of current signal, the control signal of generation is via driving circuit control switch device M1 and/or switching device M2 work Make state, to reduce intermediate energy storage capacitor C1 charge-discharge energy or input power via path diode D5- switching device M1 or the provided energy of switching device M2- diode D6 so that controlled electric current reduces, and tend to be consistent with given value of current.It drives Dynamic circuit generates driving signal, thus the work shape of control switch device M1, switching device M2 according to the control signal received State adjusts C1 charge-discharge energy input power via bis- pole path diode D5- switching device M1 or switching device M2- The height of the provided energy of pipe D6 so that controlled electric current according to the variation of rectification output DC voltage corresponding change, thus real Existing controllable silicon light modulation.Here, driving circuit can synchronize driving switch device M1, switching device M2, can also drive wherein a certain Power device, and another power device then individually controls.
Realize that there are many control program of compatible silicon controlled light modulation, it is impossible to exhaust herein.Any control strategy, it is all to pass through tune The charge-discharge energy height of intermediate energy storage capacitor C1 is saved, or adjusts input power via the provided energy of path D5-M1 or M2-D6 The height of amount, final adjustment export size of current, realize that LED luminance is adjusted, are accordingly to be regarded as the column of this patent protection.
Following control method also can be used in current limliting-constant-current circuit shown in Fig. 2, Fig. 6, comprising:
A) control switch device M2 work is lower than output filter capacitor in AC supply voltage amplitude in switch state, and only C2 voltage, i.e., | Vac | it is connected when < V_C2, the shutdown of remaining time.It can opened loop control.
B) control switch device M1 work is in switch state, AC supply voltage amplitude lower than output filter capacitor C2 and The voltage difference of intermediate energy storage capacitor C1, i.e., | Vac | it is sometime open-minded during < V_C2-V_C1.Turn-off time is controllable, thus According to demand control be transmitted to output energy number.It is greater than output filter capacitor C2 voltage in input supply voltage instantaneous value, I.e. | Vac | it is forced shutdown when > V_C2.
This kind of control method, switching device M1 and switching device M2 work in switch state, are applied to switching device two Pressure difference between end is very low, significantly reduces loss.
This kind of control method, AC power source is always via intermediate energy storage capacitor C1 to output filter capacitor C2 and load R_ Load provide energy, not via path diode D5- switching device M1 or switching device M2- diode D6 to output filtered electrical Hold C2 and load R_load provides energy.
This kind of control method, intermediate energy storage capacitor C1 are discharged by input power, effectively increase the angle of flow of rectifier bridge, To improve power factor (PF).During intermediate energy storage capacitor C1 electric discharge, supply voltage rises, under intermediate energy storage capacitor C1 voltage Drop, Vrec+V_C1 amplitude change very little, effectively limit discharge current, reduce output voltage and current ripples.
Except above-mentioned control schemes, this power circuit is also applicable in various control strategy.Switching device M1, switching device M2 It can work respectively in switch state or linear condition as needed.Input power can be filtered via intermediate energy storage capacitor C1 to output Wave capacitor C2 and load R_load provide energy, can also be via path diode D5- switching device M1 or switching device M2- bis- Pole pipe D6 provides energy to output filter capacitor C2 and load R-road.Both modes for providing energy can be carried out with timesharing, It can also carry out simultaneously.
A kind of method of supplying power to of the AC/DC power circuit of above-mentioned compatible silicon controlled light modulation, AC power source pass through intermediate energy storage Circuit provides energy to load:
Power supply mode one: when switching device M1 shutdown and switching device M2 shutdown, AC power source is via thyristor regulating photoelectricity Road, rectification circuit, diode D5, intermediate energy storage circuit and diode D6 provide energy, the charging of intermediate energy storage circuit to load;
Power supply mode two: when switching device M1 conducting and switching device M2 conducting, AC power source is via thyristor regulating photoelectricity Road, rectification circuit, switching device M2, intermediate energy storage circuit and switching device M1 provide energy to load, and intermediate energy storage circuit is put Electricity.
AC power source also timesharing or can be powered simultaneously mode three: switching device M1 conducting and switching device M2 is turned off When, AC power source is via thyristor regulating optical circuit, rectification circuit, diode D5, switching device M1;Or switching device M1 shutdown And switching device M2 is when being connected, AC power source via thyristor regulating optical circuit, rectification circuit, switching device M2, diode D6, to Load provides energy.
Following method of supplying power to also can be used in current limliting-constant-current circuit shown in Fig. 2, Fig. 6:
When the voltage of voltage V_C1 and output filter capacitor C2 of the input supply voltage amplitude higher than intermediate energy storage capacitor C1 When the sum of V_C2, input power passes through rectifier bridge (diode D1 and diode D4 or diode D2 and diode D3), diode D5 and diode D6 charges to intermediate storage capacitor C1 and output filter capacitor C2, as Fig. 3 (a), Fig. 3 (b) are shown in solid.It is intermediate Storage capacitor C1 plays metering function.
When input supply voltage amplitude lower than intermediate energy storage capacitor C1 and output filter capacitor C2 voltage and and is greater than output Filter capacitor C2 and when intermediate energy storage capacitor C1 voltage difference, suitable control switching device M1 and switching device M2, so that intermediate storage Energy capacitor C1 discharges to output by input power, rectifier bridge, switching device M2 and switching device M1, is stored in intermediate energy storage electricity The energy held in C1 is discharged into output end.As shown in Fig. 4 (a), Fig. 4 (b).Intermediate energy storage capacitor C1 is with input power jointly to defeated Energy is provided out.Switching device M1 and switching device M2 can work respectively as needed in linear condition or switch state.
During input supply voltage amplitude is higher than output filter capacitor C2 voltage, i.e., | Vac | during > V_C2, it can also fit As control switch device M1 or switching device M2, so that input power passes through rectifier bridge-diode D5- switching device M1 or whole Bridge-switching device M2- diode D6 is flowed to charge to output filter capacitor C2.Its principle is identical as conventional linear power circuit.Together When can with intermediate energy storage capacitor C1 charge or discharge.
Except the other times section of above-mentioned three kinds of operating modes, rectifier bridge, diode D6, switching device M1, is opened diode D5 It closes device M2 not work, only output filter capacitor C2, which discharges, provides energy to load R_load.If without output filter capacitor C2, then load current is interrupted.

Claims (14)

1. a kind of AC/DC power circuit of compatible silicon controlled light modulation characterized by comprising
One AC power source, provides alternating current;
One thyristor regulating optical circuit, the size by changing the angle of flow realize the adjusting of its output voltage;
One rectification circuit provides AC power source to alternating current and is converted to direct current;
One current limliting-constant-current circuit, control switch device, thus control the charge or discharge electric current of intermediate energy storage circuit amplitude or Discharge time realizes current limliting or output constant current;
One load circuit is connected between rectification circuit and current limliting-constant-current circuit, and AC power source and current limliting-constant-current circuit are mentioned The electric energy of confession is converted to output energy;
The DC voltage of one dim signal generation circuit, detection rectification circuit output generates dim signal, the output signal conduct One input signal of controller, provides current to and determines signal;
One current detection circuit detects controlled electric current, i.e. current limliting-constant-current circuit output electric current, and output signal is as control Another input of device, provides current feedback signal;
One controller generates switching device in current limliting-constant-current circuit according to the difference of given value of current signal and current feedback signal Control signal, the variation of the DC voltage for export controlled electric current according to rectification circuit and corresponding change, realization thyristor regulating Light, and the control signal is provided to driving circuit;
One drive circuit generates the working condition of switching device in control current limliting-constant-current circuit according to the control signal received Driving signal;
Wherein, current limliting-constant-current circuit includes intermediate energy storage circuit, switching device M1, switching device M2, diode D5, diode The input terminal of D6, rectification circuit are connected with AC power source respectively, the anode of the cathode output end connection diode D5 of rectification circuit, The cathode of diode D5 passes through the anode of intermediate energy storage circuit connection diode D6, and the cathode of diode D6 is whole by load connection The cathode output end of current circuit;
One end of switching device M1 is connected to the cathode of diode D5 and the intersection of intermediate energy storage circuit, and switching device M1's is another One end is connected to the cathode of diode D6 and the intersection of load, the control termination control signal of switching device M1;Switching device One end of M2 is connected to the intersection of the anode and the cathode output end of rectification circuit of diode D5, the other end of switching device M2 It is connected between the intersection of accumulator and the anode of diode D6, the control termination control signal of switching device M2;
Or, current limliting-constant-current circuit includes intermediate energy storage circuit, switching device M1, switching device M2, diode D5, diode D6, The input terminal of rectification circuit is connected with AC power source respectively, and the cathode output end of rectification circuit passes through load connection diode D6's Anode, the cathode of diode D6 pass through the anode of intermediate energy storage circuit connection diode D5, and the cathode of diode D5 connects rectification The cathode output end of circuit;
One end of switching device M1 is connected to anode and the intersection of load of diode D6, the other end connection of switching device M1 In the intersection of intermediate energy storage circuit and the anode of diode D5, the control termination control signal of switching device M1;Switching device One end of M2 is connected to the cathode of diode D6 and the intersection of intermediate energy storage circuit, and the other end of switching device M2 is connected to two The intersection of the cathode output end of the cathode and rectification circuit of pole pipe D5, the control termination control signal of switching device M2.
2. the AC/DC power circuit of compatible silicon controlled light modulation as described in claim 1, it is characterised in that: load circuit also wraps Output filter capacitor C2 is included, output filter capacitor C2 is in parallel with load.
3. the AC/DC power circuit of compatible silicon controlled light modulation as described in claim 1, it is characterised in that: intermediate energy storage circuit Storage capacitor network is used using intermediate energy storage capacitor C1 or intermediate energy storage circuit, storage capacitor network is equivalent to during charging The series connection of two or more capacitors is equivalent to the parallel connection of two or more capacitors during electric discharge.
4. the AC/DC power circuit of compatible silicon controlled light modulation as described in claim 1, it is characterised in that: switching device M1 is adopted With field-effect tube M1, the drain electrode of field-effect tube M1 is connected to the cathode of diode D5 and the intersection of intermediate energy storage circuit, field effect Should the source electrode of pipe M1 be connected to the cathode of diode D6 and the intersection of load, the external control signal of the grid of field-effect tube M1.
5. the AC/DC power circuit of compatible silicon controlled light modulation as described in claim 1, it is characterised in that: switching device M2 is adopted With field-effect tube M2, the drain electrode of field-effect tube M2 is connected to the anode of diode D5 and crossing for the cathode output end of rectification circuit Place, the source electrode of field-effect tube M2 are connected between the intersection of accumulator and the anode of diode D6, the grid of field-effect tube M2 Extremely external control signal.
6. the AC/DC power circuit of compatible silicon controlled light modulation as described in claim 1, it is characterised in that: switching device M1 is adopted With field-effect tube M1, the drain electrode of field-effect tube M1 is connected to anode and the intersection of load of diode D6, field-effect tube M1's Source electrode is connected to the intersection of the anode and intermediate energy storage circuit of diode D5, the external control signal of the grid of field-effect tube M1.
7. the AC/DC power circuit of compatible silicon controlled light modulation as described in claim 1, it is characterised in that: switching device M2 is adopted With field-effect tube M2, the drain electrode of field-effect tube M2 is connected to the cathode of diode D6 and the intersection of intermediate energy storage circuit, field effect Should pipe M2 source electrode be connected to rectification circuit cathode output end and diode D5 cathode pole intersection, the grid of field-effect tube M2 Extremely external control signal.
8. a kind of control method of the AC/DC power circuit of any one of claim 1-7 compatible silicon controlled light modulation, feature It is, when current feedback signal is lower than given value of current signal, the control signal that controller generates is via driving circuit control switch The working condition of device M1 and/or switching device M2, to increase C1 charge-discharge energy or input power via two pole of path Pipe D5- switching device M1 or the provided energy of switching device M2- diode D6 tend to and electric current so that controlled electric current increases It is given consistent;When current feedback signal is higher than given value of current signal, the control signal that controller generates is controlled via driving circuit Switching device M1 or switching device M2 working condition, to reduce C1 charge-discharge energy or input power via path diode D5- switching device M1 or the provided energy of switching device M2- diode D6 so that controlled electric current reduces, and tend to and electric current It is given consistent.
9. the control method of the AC/DC power circuit of compatible silicon controlled light modulation as claimed in claim 8, which is characterized in that open It closes device M1 and switching device M2 and is individually controlled work in linear condition or switch state.
10. the control method of the AC/DC power circuit of compatible silicon controlled light modulation as claimed in claim 9, which is characterized in that
Control switch device M2 works in switch state, and only when AC supply voltage amplitude is lower than load voltage, derailing switch Part M2 conducting, remaining time turn off switching device M2;
Control switch device M1 work is lower than load voltage and intermediate energy storage circuit in switch state, in AC supply voltage amplitude Switching device M1 is sometime opened during difference in voltage, according to demand the turn-off time of control switch device M1 and then control It is transmitted to the energy of load;Switching device M1 is forced shutdown when AC supply voltage amplitude is greater than load voltage.
11. a kind of method of supplying power to of the AC/DC power circuit of any one of claim 1-7 compatible silicon controlled light modulation, special Sign is that AC power source provides energy to load by intermediate energy storage circuit:
Power supply mode one: AC power source is via thyristor regulating optical circuit, rectification circuit, diode D5, intermediate energy storage circuit and two Pole pipe D6 provides energy, the charging of intermediate energy storage circuit to load;
Power supply mode two: AC power source via thyristor regulating optical circuit, rectification circuit, switching device M2, intermediate energy storage circuit and Switching device M1 provides energy, intermediate energy storage circuit discharging to load.
12. the method for supplying power to of the AC/DC power circuit of compatible silicon controlled light modulation as claimed in claim 11, it is characterised in that: AC power source also timesharing or can be powered simultaneously mode three: AC power source is via thyristor regulating optical circuit, rectification circuit, two poles Pipe D5, switching device M1 or AC power source via thyristor regulating optical circuit, rectification circuit, switching device M2, diode D6, to Load provides energy.
13. the method for supplying power to of the AC/DC power circuit of compatible silicon controlled light modulation as claimed in claim 12, it is characterised in that:
When AC supply voltage amplitude is higher than the sum of intermediate energy storage circuit voltage and load voltage, into power supply mode one;
AC supply voltage amplitude is lower than the sum of intermediate energy storage circuit voltage and load voltage and is higher than load voltage and intermediate storage When the difference of energy circuit voltage, into power supply mode two;
During AC supply voltage amplitude is higher than load voltage, power supply mode three can be entered.
14. the method for supplying power to of the AC/DC power circuit of compatible silicon controlled light modulation as claimed in claim 13, it is characterised in that: Power supply mode one, power supply mode two, the other times section outside power supply mode three, rectification circuit, diode D6, are opened diode D5 Pass device M1, switching device M2 do not work, and only output filter capacitor C2, which discharges, provides energy to load;If being filtered without output Capacitor C2, then load current is interrupted.
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CN103139992A (en) * 2013-02-26 2013-06-05 上海大学 Light-emitting diode (LED) dimming driving system with silicon controlled bypass dimming circuit
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