CN207099392U - Power supply circuit and apply its LED drive circuit - Google Patents
Power supply circuit and apply its LED drive circuit Download PDFInfo
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- CN207099392U CN207099392U CN201721045961.XU CN201721045961U CN207099392U CN 207099392 U CN207099392 U CN 207099392U CN 201721045961 U CN201721045961 U CN 201721045961U CN 207099392 U CN207099392 U CN 207099392U
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Abstract
The utility model discloses a kind of power supply circuit and its LED drive circuit is applied, the second constant electric current is converted to electric power outputting current by constant-current control circuit；When second electric current be more than light modulator needed for electric current when, shunt circuit shunts to second electric current, accumulator energy storage；When second electric current be less than or equal to the light modulator needed for electric current when, the accumulator releases energy, and is the dimmer powered jointly with the constant-current control circuit.The power supply is coupled to the power stage of the LED drive circuit by assists winding, when the irregular power consumption of light modulator, because the second electric current of constant-current control circuit output is always constant current state, it will not affect that the size of current of assists winding output, and then the output current of winner's power stage is not influenceed by light modulator, so as to ensure that LED does not flash, in addition, LED power supply circuit constructions of the present utility model are relatively easy and are easy to integrate, and production cost is low.
Description
Technical field
It the utility model is related to electronic technology field, and in particular to a kind of power supply circuit and the LED driving electricity using it
Road.
Background technology
LED is referred to as forth generation lighting source or green light source, has the characteristics that energy-saving and environmental protection, long lifespan, small volume,
It can be widely applied to various lighting fields, as a kind of new green light source product, necessarily future development becomes LED
Gesture, LED dim signal generators are one kind electricity for changing the luminous flux of light source in LED light device, regulation illumination level
Device of air, dimmer powered way choice can also directly affect LED and light.
The power supply mode of traditional dim signal generator is powered by ac-dc converter circuit, as shown in figure 1, but this
The implementation system bulk of sample is larger, is unfavorable for integrating, and cost is higher.In order to reduce cost, Fig. 2 show a kind of improvement
Dimmer powered mode, its by assists winding and linear constant voltage circuit to dimmer powered, although reducing production cost,
But the irregular power consumption of light modulator can influence input current change, so as to cause LED to flash
Utility model content
In view of this, the utility model provides a kind of power supply circuit and applies its LED drive circuit, existing to solve
In technology, caused by the irregular power consumption of light modulator the problem of LED flickers.
First aspect, there is provided a kind of power supply circuit, for receiving energy from power supply and providing output current to load, it is special
Sign is that the power supply circuit includes：
Constant-current control circuit, receives the first voltage and the first electric current of the power supply output, and exports second voltage and perseverance
The second fixed electric current；
Shunt circuit, it is connected between two output ends of the constant-current control circuit, when second electric current is more than institute
When stating output current, the shunt circuit shunts to second electric current, and the electric current on the shunt circuit is first
Divide electric current；When second electric current is less than or equal to the output current, the shunt circuit is stopped；
Accumulator, it is connected in parallel with the shunt circuit, it is described when second electric current is more than the output current
Accumulator energy storage；When second electric current is less than or equal to the output current, the accumulator releases energy, with institute
It is the load supplying jointly to state constant-current control circuit, and the electric current on the accumulator is second point of electric current.
Preferably, the constant-current control circuit has the first output end and the second output end, second output head grounding；
The accumulator has first end and the second end, the second end ground connection.
Preferably, second electric current is consistently equal to first point of electric current and the output current sum and described second
Divide difference between currents.
Preferably, the size of second electric current is determined by first voltage source and sampling resistor.
Preferably, the constant-current control circuit includes：
The first transistor, its first end are connected to the output end of the power supply, and the second end is the constant-current control circuit
First output end；
First resistor, it is connected between the first end of the first transistor and control terminal, to drive first crystalline substance
The unlatching of body pipe；
First comparator, its in-phase input end are connected to the positive pole of the first voltage source, and inverting input is connected to the ground,
Export the first comparison signal；The sampling resistor is connected between the negative pole of the first voltage source and the ground；
First switch, is controlled by first comparison signal, and it is connected in series in the first crystal with the first current source
Between the negative pole of the control terminal of pipe and the first voltage source.
Preferably, the shunt circuit includes a voltage-regulator diode, and its negative electrode is connected to the of the constant-current control circuit
One output end, anode are connected to describedly.
Preferably, the accumulator includes a storage capacitor.
Preferably, the power supply circuit also includes a constant-voltage control circuit, is connected to the accumulator and the load
Between, for providing a stable output voltage to the load.
Preferably, the size of the output voltage is determined by the second voltage source.
Preferably, the constant-voltage control circuit includes：
Second transistor, its first end are connected to the first end of the accumulator, and the second end is connected to the load
Input；
Second resistance, it is connected between the first end of the second transistor and control terminal, to drive second crystalline substance
The unlatching of body pipe；
Second comparator, its in-phase input end are connected to the positive pole of the second voltage source, described in inverting input receives
Output voltage, exports the second comparison signal, and the negative pole of the second voltage source is connected to describedly；
Second switch, it is controlled by second comparison signal, it is connected in series in second crystal with the second current source
Between the control terminal of pipe and the ground.
Preferably, the shunt circuit includes：
3rd comparator, its inverting input are connected to the positive pole in tertiary voltage source, and in-phase input end receives described second
Voltage, exports the 3rd comparison signal, and the negative pole in the tertiary voltage source is connected to describedly；
Third transistor, is controlled by the 3rd comparison signal, and its first end is connected to the of the constant-current control circuit
One output end, the second end are connected to describedly.
Second aspect, there is provided a kind of LED drive circuit using the utility model power supply circuit, including power stage circuit,
Including a master power switch and an energy-storage travelling wave tube, for receiving the output signal of an external power source, and direct current letter is converted into
Number give LED load power supply；Control circuit, for controlling the master power switch；Light modulator, for exporting dim signal to described
Control circuit；Accessory power supply, including an assists winding, the assists winding are coupled with the energy-storage travelling wave tube to obtain energy；Its
It is characterised by, the LED drive circuit, in addition to：
Power supply circuit described in any of the above one, for obtaining energy from the accessory power supply and being supplied to the light modulator
Electricity.
The utility model receives first voltage and the first electric current that power supply exports by constant-current control circuit, and exports second
Voltage and the second constant electric current；When second electric current be more than the load needed for electric current when, the shunt circuit is to institute
State the second electric current to be shunted, the electric current on the shunt circuit is first point of electric current, the storage capacitor energy storage；When described
When two electric currents are less than or equal to the electric current needed for the load, the accumulator releases energy, with the constant-current control circuit
It is the load supplying jointly, the electric current on the accumulator is second point of electric current.By this way, even if load is irregular
Power consumption does not interfere with the output signal of the power supply yet.When being particularly applicable in Dimmable LED drive circuit, the load is
Light modulator, the power supply is coupled to the power stage of the LED drive circuit by assists winding, when the irregular power consumption of light modulator
When, because the second electric current of constant-current control circuit output is always constant current state, it will not affect that assists winding output electricity
The size of stream, and then the output current of winner's power stage is not influenceed by light modulator, so as to ensure that LED does not flash, separately
Outside, LED power supply circuit constructions of the present utility model are relatively easy and are easy to integrate, and production cost is low.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to the accompanying drawing of offer.
Fig. 1 is a kind of circuit structure diagram of LED drive circuit of the prior art；
Fig. 2 is a kind of circuit structure diagram of improved LED drive circuit of the prior art；
Fig. 3 is the circuit block diagram of the first power supply circuit according to the utility model embodiment；
Fig. 4 is the concrete structure diagram of second of power supply circuit according to the utility model embodiment；
Fig. 5 is a kind of current waveform figure of power supply circuit according to the utility model embodiment；
Fig. 6 is the concrete structure diagram of the third power supply circuit according to the utility model embodiment
Fig. 7 is the concrete structure diagram of the 4th kind of power supply circuit according to the utility model embodiment；
Fig. 8 is a kind of circuit structure diagram of LED drive circuit according to the utility model embodiment.
Embodiment
The utility model is described below based on embodiment, but the utility model is not restricted to these implementations
Example.It is detailed to describe some specific detail sections below in detailed description of the present utility model.To people in the art
The description of part can also understand the utility model completely without these details for member.It is of the present utility model in order to avoid obscuring
Essence, the not narration in detail of known method, process, flow, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein accompanying drawing be provided to explanation purpose, and
What accompanying drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through by least one element or sub-circuit electric
The galvanic circle that connection or electromagnetism connect and compose." connected when claiming element or another element of circuit " being connected to " or element/circuit
" between two nodes when, it can directly be coupled or be connected to another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, " connect when title element " being directly coupled to " or directly
Be connected to " another element when, it is meant that intermediary element is not present in both.
Unless the context clearly requires otherwise, otherwise entire disclosure is similar with the " comprising " in claims, "comprising" etc.
Word should be construed to the implication included rather than exclusive or exhaustive implication；That is, it is containing for " including but is not limited to "
Justice.
In description of the present utility model, it is to be understood that term " first ", " second " etc. are only used for describing purpose,
And it is not intended that instruction or hint relative importance.In addition, in description of the present utility model, it is unless otherwise indicated, " more
It is individual " it is meant that two or more.
The utility model is described in further detail with reference to the accompanying drawings and examples.
With reference to the circuit block diagram that figure 3 is the first power supply circuit according to the utility model embodiment, power supply circuit 30 wraps
Include constant-current control circuit 22, shunt circuit 23, accumulator 24, the shunt circuit 23 is connected to the constant-current control circuit 22
Two output ends between, the accumulator 24 is connected in parallel with the shunt circuit 23.The power supply circuit 30 is used for will
The first voltage V that power supply 21 exports1With the first electric current I1It is transformed to second voltage V2With electric current IOUT, to give the power supply of load 25.Its
In, the constant-current control circuit 22 receives the first voltage V1With the first electric current I1And export the second constant electric current I2, work as institute
State the second electric current I2More than the electric current I needed for the load 25OUTWhen, the shunt circuit 23 is to the second electric current I2Divided
Flow, the electric current flowed through on the shunt circuit 23 is first point of electric current ISH1, meanwhile, the energy storage of accumulator 24, accumulator
Voltage on 24 is the second voltage V2；As the second electric current I2Less than or equal to the electric current I needed for the load 25OUT
When, the shunt circuit 23 does not work, and the accumulator 24 releases energy, and the electric current flowed through on the accumulator 24 is the
Two points of electric current ISH2.The electric current IOUTWith second voltage V2Input loads 25 to described.
It should be noted that in embodiment provided by the utility model, load 25 is light modulator.Obviously, this area
Those of ordinary skill understands that load 25 can be the load of other irregular power consumptions, and be not limited to light modulator.
It is the concrete structure diagram of second of power supply circuit according to the utility model embodiment with reference to shown in figure 4.In this reality
Apply in example, the power supply 21 specifically includes assists winding NAU, commutation diode D1 and filter capacitor C1, the assists winding NAU
With the transformer or inductive of main power stage, the commutation diode D1 and the filter capacitor C1 it is in series rectification filter
Wave circuit and the assists winding NAUIt is connected in parallel, i.e., described commutation diode D1 anode and the assists winding NAUIt is same
The connection of name end, negative electrode be connected with the first end of the filter capacitor C1, the second end of the filter capacitor C1 and it is described aid in around
Group NAUNon-same polarity connection, wherein, the first output end of the negative electrode of the commutation diode D1 as the power supply 21 is described
Second output end of filter capacitor C1 the second end as the power supply 21.Voltage on the filter capacitor C1 is the first electricity
Press V1, the output current of the power supply 21 is the first electric current I1。
The constant-current control circuit 22 specifically includes the first transistor Q1, first resistor R1, first switch K1, current source
IS1, sampling resistor RS, voltage source VIN_REFAnd comparator CMP1.The first end of the first transistor Q1 is connected to the electricity
First output end in source 21, first output end of second end as the constant-current circuit 22.The first resistor R1 is connected to institute
Between the first end and control terminal of stating the first transistor Q1.The first switch K1 and current source IS1It is connected in series in described
Between the first transistor Q1 control terminal and the second output end of the power supply 21.The sampling resistor RSIt is connected to the power supply
Between 21 the second output end and ground.The first input end (for example, inverting input) of the comparator CMP1 is connected to the ground, the
Two inputs (for example, in-phase input end) are connected to the voltage source VIN_REFPositive pole, output end is connected to the first switch
K1 control terminal.The voltage source VIN_REFNegative pole be connected to the second output end of the power supply 21.
In the present embodiment, so that the first transistor Q1 is p-type metal-oxide-semiconductor as an example, the first end of the first transistor Q1 is
Source S, the second end are drain D, and control terminal is grid G.Certainly, those skilled in the art can also use other conventional devices,
Such as the device such as N-type metal-oxide-semiconductor, BJT replaces p-type metal-oxide-semiconductor, make some simple adaptability conversion to circuit and realize same work(
Energy.
The operation principle of the constant-current control circuit 22 is：As the sampling resistor RSOn pressure drop (i.e. I2*RS) be less than
Voltage VIN_REFWhen, the output signal of the comparator CMP1 is high level, controls the first switch K1 to turn on, the electric current
Source IS1Output current flows through the first resistor R1 so that pressure drop (the i.e. V on the first resistor R1S-VG=R1*IS1) be more than
The absolute value of the first transistor Q1 threshold voltages, the first transistor Q1 conductings.Conversely, work as the RSOn pressure drop (i.e. I2*
RS) it is more than or equal to voltage VIN_REFWhen, the output signal of the comparator CMP1 is low level, controls the first switch K1
Shut-off, the first transistor Q1 are turned off therewith.By controlling the first transistor Q1 to be in high-frequency work state so that described
The output current I of constant-current control circuit 222Equal to VIN_REF/RS。
The shunt circuit 23 specifically includes a voltage-regulator diode DZ, the voltage-regulator diode DZNegative electrode be connected to it is described
First output end of constant-current control circuit 22, anode are connected to the ground, and the accumulator 24 specifically includes a storage capacitor CSHUNT,
It is connected in parallel with the shunt circuit 23, i.e., described storage capacitor CSHUNTFirst end be connected to the voltage-regulator diode DZ's
Negative electrode, the second end are connected to the ground.
As the second voltage V2More than the voltage-regulator diode DZVoltage stabilizing value when, voltage-regulator diode DZBreakdown, its both ends
Voltages keep constant, the voltage-regulator diode DZTo the second electric current I2Shunted, its shunt current is first point of electric current
ISH1, meanwhile, the storage capacitor CSHUNTCarry out energy storage；As the second voltage V2Less than or equal to the voltage-regulator diode DZ
Voltage stabilizing value when, diode reverse cut-off equivalent to open circuit, no current passes through the storage capacitor CSHUNTThe supply that releases energy is adjusted
Light device 25, flow through the storage capacitor CSHUNTElectric current be second point of electric current ISH2, the electric current IOUTWith second voltage V2Input
To the light modulator 25.Based on voltage-regulator diode DZCharacteristic, can be according to the second electric current I2With electric current IOUTAutomatic shunt is realized, is made
Obtaining the light modulator 25 can be as needed brokenly from the second constant electric current I2Extract electric current IOUT.Voltage-regulator diode it is steady
Pressure value is given according to physical circuit requirement.
With reference to the current waveform figure shown in Fig. 5, a kind of power supply according to the utility model embodiment is further described
The operation principle of circuit.In t0-t1, t2-t3 periods, the electric current I of light modulator extractionOUTIt is smaller, the second electric current I2Greatly
In output current IOUT, shunt circuit 23 is to the second electric current I2Shunted, the electric current flowed through on the shunt circuit 23 is first
Divide electric current ISH1, meanwhile, storage capacitor carries out energy storage.And in t1-t2, t3-t4 periods, the electric current I of light modulator extractionOUT
It is larger, the second electric current I2Less than or equal to output current IOUT, shunt circuit 23 is stopped, storage capacitor CSHUNTStart
Release energy, the electric current for flowing through storage capacitor is second point of electric current ISH2, to be dimmer powered jointly with the second electric current I2.
During dimmer operation, circuit follows I all the time2=IOUT+ISH1-ISH2。
It is the concrete structure diagram of the third power supply circuit according to the utility model embodiment with reference to shown in figure 6.In this reality
Apply in example, the power supply circuit equally has constant-current control circuit, shunt circuit and accumulator, also, the current constant control
Circuit, shunt circuit and accumulator have second of the power supply circuit identical circuit structure provided with Fig. 4 and work former
Reason, for the purpose of simplifying the description, will not be repeated here.Difference is, when one burning voltage of input is required when dimmer operation,
The power supply circuit also includes a constant-voltage control circuit 26, and in the present embodiment, it is brilliant that the constant-voltage control circuit 26 includes second
Body pipe Q2, second resistance R2, second switch K2, current source IS2, voltage source VOREFAnd comparator CMP2.
The first end of the second transistor Q2 is connected to the storage capacitor CSHUNTFirst end, the second end is connected to institute
State the input of light modulator 25.The second resistance R2 is connected between the first end and control terminal of the second transistor Q2.
The second switch K2 and current source IS2It is connected in series between control terminal and the ground of the second transistor Q2.Institute
The first input end (for example, inverting input) for stating comparator CMP2 is connected to the second end of the second transistor Q2, the
Two inputs (for example, in-phase input end) are connected to shown voltage source VOREFPositive pole, output end is connected to the second switch
K2 control terminal.The voltage source VOREFNegative pole be connected to describedly.
In the present embodiment, so that second transistor Q2 is p-type metal-oxide-semiconductor as an example, the first end of the second transistor Q2 is
Source S, the second end are drain D, and control terminal is grid G.Certainly, those skilled in the art can also use other conventional devices,
Such as the device such as N-type metal-oxide-semiconductor, BJT replaces p-type metal-oxide-semiconductor, make some simple adaptability conversion to circuit and realize same work(
Energy.
The operation principle of the constant-voltage control circuit 26 is：As the output voltage V of the constant-voltage control circuit 26OUTIt is less than
Voltage VOREFWhen, the output signal of the comparator CMP2 is high level, controls the second switch K2 to turn on, the current source
IS2Output current flows through the second resistance R2, pressure drop (the i.e. V in the second resistanceS-VG=R2*IS2) it is more than described the
The absolute value of two-transistor Q2 threshold voltage, the second transistor Q2 conductings.Conversely, work as the constant-voltage control circuit 26
Output voltage VOUTMore than or equal to voltage VOREFWhen, the output signal of the comparator CMP2 is low level, described in control
Second switch K2 is turned off, and the second transistor Q2 is turned off therewith.By controlling second transistor Q2 to be in high-frequency work shape
State so that the output voltage V of the constant-voltage control circuit 26OUTEqual to voltage VOREF。
It is the concrete structure diagram according to the 4th kind of power supply circuit of the present utility model, in the present embodiment with reference to shown in figure 7
In, the power supply circuit equally has constant-current control circuit, shunt circuit, accumulator and constant-voltage control circuit, also, described
Constant-current control circuit, accumulator and constant-voltage control circuit have the third power supply circuit identical circuit provided with Fig. 6
Structure and operation principle, for the purpose of simplifying the description, it will not be repeated here.Difference is that in the present embodiment, the shunting is electric
Road 23 includes third transistor Q3, voltage source VSHUNT_REFAnd comparator CMP3.The first end of the third transistor Q3 connects
The first output end of the constant-current control circuit 22 is connected to, the second end is connected to describedly.The first of the comparator CMP3 is defeated
Enter the first output end that end (for example, in-phase input end) is connected to the constant-current control circuit 22, the second input is (for example, anti-
Phase input) it is connected to the voltage source VSHUNT_REFPositive pole, output end is connected to the control terminal of the third transistor Q3.
The voltage source VSHUNT_REFNegative pole be connected to describedly.
In the present embodiment, so that third transistor Q3 is N-type metal-oxide-semiconductor as an example, the first end of the third transistor Q3 is
Drain D, the second end are source S, and control terminal is grid G.Certainly, those skilled in the art can also use other conventional devices,
Such as the device such as p-type metal-oxide-semiconductor, BJT replaces N-type metal-oxide-semiconductor, make some simple adaptability conversion to circuit and realize same work(
Energy.
The operation principle of the shunt circuit 23 is：As the second voltage V2More than voltage VSHUNT_REFWhen, the ratio
Output signal compared with device CMP3 is high level, controls the control terminal of the third transistor Q3, and the third transistor Q3 is turned on,
The third transistor Q3 is operated in variable resistor area, the output characteristics based on MOSFET, iD=f (uDS)/uGS=constant, flows through
Third transistor Q3 first point of electric current ISH1Can be with drain-source voltage VDSChange and change, thus according to the second electric current I2With
Electric current IOUTBetween relation, realize automatic shunt.Conversely, work as the second voltage V2Less than or equal to voltage VSHUNT_REFWhen,
The output signal of the comparator CMP3 is low level, and the third transistor Q3 shut-offs, the shunt circuit 23 is stopped.
It is a kind of circuit structure diagram of LED drive circuit according to the utility model embodiment with reference to shown in figure 8.At this
In embodiment, the LED drive circuit is used to drive LED, and the LED drive circuit specifically includes accessory power supply 40, power supply
Circuit 41, light modulator 42, control circuit 43, power stage circuit 44.
In the present embodiment, the power stage circuit 44 specifically includes rectification circuit 441, filter capacitor CinAnd power becomes
Parallel operation 442.The filtering CinIt is connected between two output ends of the rectification circuit 441, AC signal VACRectified filtering
After be converted to direct current signal Vin.Herein, by taking inverse excitation type converter as an example, the power inverter 442 includes having primary side winding
NP and vice-side winding NS transformer T, power switch pipe M1, secondary commutation diode and output capacitance.Pass through the control electricity
Road 43 controls the power switch pipe M1 in the power inverter 442, can be by direct current signal VinAnd IinBe converted to output signal
Vout2And Iout2, to be powered to LED load.When the LED load needs light modulation, the control circuit 43 is received from described
The dim signal of light modulator 42, by controlling power switch pipe M1, regulation output current Iout2, so as to realize brightness adjustment control.
Wherein, the power supply of the light modulator 42 is realized by power supply circuit 41 and accessory power supply 40.The power supply circuit and auxiliary
Help the concrete structure of power supply and operation principle refers to embodiment given by Fig. 3-Fig. 7, will not be repeated here.
It can be seen from embodiment provided by the utility model, the power inverter 442 can select isolated, non-isolated
Any one in formula, boosting, decompression, buck topology, it is described as long as power inverter 442 includes an inductance or transformer
Accessory power supply 40 can obtain energy by its assists winding, and then input to the power supply circuit 41, and be not limited to this implementation
Inverse excitation type converter disclosed in example.
By upper, the utility model receives first voltage and the first electric current that power supply exports by constant-current control circuit, and defeated
Go out second voltage and the second constant electric current；When second electric current be more than the load needed for electric current when, it is described shunting electricity
Road shunts to second electric current, and the electric current on the shunt circuit is first point of electric current, the storage capacitor energy storage；When
When second electric current is less than or equal to the electric current needed for the load, the accumulator releases energy, with the constant current control
Circuit processed is the load supplying jointly, and the electric current on the accumulator is second point of electric current.By this way, even if load
Irregular power consumption does not interfere with the output signal of the power supply yet.It is described when being particularly applicable in Dimmable LED drive circuit
Load as light modulator, power stage of the power supply by assists winding coupled to the LED drive circuit, when light modulator is irregular
During power consumption, because the second electric current of constant-current control circuit output is always constant current state, it will not affect that assists winding is defeated
Go out the size of electric current, and then the output current of winner's power stage is not influenceed by light modulator, so as to ensure that LED does not dodge
Bright, in addition, LED power supply circuit constructions of the present utility model are relatively easy and are easy to integrate, production cost is low.
Preferred embodiment of the present utility model is the foregoing is only, is not limited to the utility model, for this area
For technical staff, the utility model can have various changes and change.All institutes within spirit of the present utility model and principle
Any modification, equivalent substitution and improvements of work etc., should be included within the scope of protection of the utility model.
Claims (12)
- A kind of 1. power supply circuit, for receiving energy from power supply and providing output current to load, it is characterised in that the power supply Circuit includes：Constant-current control circuit, receives the first voltage and the first electric current of power supply output, and exports second voltage and constant Second electric current,Shunt circuit, it is connected between two output ends of the constant-current control circuit, when second electric current is more than described defeated When going out electric current, the shunt circuit shunts to second electric current, and the electric current on the shunt circuit is first point of electric current； When second electric current is less than or equal to the output current, the shunt circuit is stopped；Accumulator, it is connected in parallel with the shunt circuit, when second electric current is more than the output current, the energy storage Circuit energy storage；When second electric current is less than or equal to the output current, the accumulator releases energy, with the perseverance Flow control circuit is the load supplying jointly, and the electric current on the accumulator is second point of electric current.
- 2. power supply circuit according to claim 1, it is characterised in thatThe constant-current control circuit has the first output end and the second output end, second output head grounding；The accumulator has first end and the second end, and second termination is describedly.
- 3. power supply circuit according to claim 1, it is characterised in that second electric current is consistently equal to first point of electricity Stream and the output current sum and second point of difference between currents.
- 4. power supply circuit according to claim 2, it is characterised in that the size of second electric current by first voltage source and Sampling resistor determines.
- 5. power supply circuit according to claim 4, it is characterised in that the constant-current control circuit includes：The first transistor, its first end are connected to the output end of the power supply, and the second end is the first of the constant-current control circuit Output end；First resistor, it is connected between the first end of the first transistor and control terminal, to drive the first transistor Unlatching；First comparator, its in-phase input end are connected to the positive pole of the first voltage source, and inverting input is connected to the ground, output First comparison signal；The sampling resistor is connected between the negative pole of the first voltage source and the ground；First switch, is controlled by first comparison signal, and it is connected in series in the first transistor with the first current source Between the negative pole of control terminal and the first voltage source.
- 6. power supply circuit according to claim 2, it is characterised in that the shunt circuit includes a voltage-regulator diode, its Negative electrode is connected to the first output end of the constant-current control circuit, and anode is connected to describedly.
- 7. power supply circuit according to claim 1, it is characterised in that the accumulator includes a storage capacitor.
- 8. power supply circuit according to claim 2, it is characterised in that the power supply circuit also includes Isobarically Control electricity Road, it is connected between the accumulator and the load, for providing a stable output voltage to the load.
- 9. power supply circuit according to claim 8, it is characterised in that the size of the output voltage is determined by the second voltage source It is fixed.
- 10. power supply circuit according to claim 9, it is characterised in that the constant-voltage control circuit includes：Second transistor, its first end are connected to the first end of the accumulator, and the second end is connected to the input of the load End；Second resistance, it is connected between the first end of the second transistor and control terminal, to drive the second transistor Unlatching；Second comparator, its in-phase input end are connected to the positive pole of the second voltage source, and inverting input receives the output Voltage, exports the second comparison signal, and the negative pole of the second voltage source is connected to describedly；Second switch, is controlled by second comparison signal, and it is connected in series in the second transistor with the second current source Between control terminal and the ground.
- 11. power supply circuit according to claim 2, it is characterised in that the shunt circuit includes：3rd comparator, its inverting input are connected to the positive pole in tertiary voltage source, and in-phase input end receives the second voltage, The 3rd comparison signal is exported, the negative pole in the tertiary voltage source is connected to describedly；Third transistor, is controlled by the 3rd comparison signal, and it is first defeated to be connected to the constant-current control circuit for its first end Go out end, the second end is connected to describedly.
- 12. a kind of LED drive circuit, including power stage circuit, including a master power switch and an energy-storage travelling wave tube, for receiving one The output signal of external power source, and be converted into direct current signal and powered to LED load；Control circuit, for controlling the master Power switch；Light modulator, for exporting dim signal to the control circuit；Accessory power supply, including an assists winding, it is described auxiliary Winding is helped to be coupled with the energy-storage travelling wave tube to obtain energy；Characterized in that, the LED drive circuit, in addition to：According to the power supply circuit described in claim 1-11 any one, for obtaining energy and to described from the accessory power supply Dimmer powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721045961.XU CN207099392U (en) | 2017-08-21 | 2017-08-21 | Power supply circuit and apply its LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721045961.XU CN207099392U (en) | 2017-08-21 | 2017-08-21 | Power supply circuit and apply its LED drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207099392U true CN207099392U (en) | 2018-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721045961.XU Withdrawn - After Issue CN207099392U (en) | 2017-08-21 | 2017-08-21 | Power supply circuit and apply its LED drive circuit |
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| Country | Link |
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| CN (1) | CN207099392U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107567130A (en) * | 2017-08-21 | 2018-01-09 | 矽力杰半导体技术(杭州)有限公司 | Power supply circuit and apply its LED drive circuit |
| CN113163556A (en) * | 2021-05-08 | 2021-07-23 | 深圳市必易微电子股份有限公司 | Load drive suppression circuit and load power supply system |
-
2017
- 2017-08-21 CN CN201721045961.XU patent/CN207099392U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107567130A (en) * | 2017-08-21 | 2018-01-09 | 矽力杰半导体技术(杭州)有限公司 | Power supply circuit and apply its LED drive circuit |
| CN107567130B (en) * | 2017-08-21 | 2023-09-12 | 矽力杰半导体技术(杭州)有限公司 | Power supply circuit and LED driving circuit applying same |
| CN113163556A (en) * | 2021-05-08 | 2021-07-23 | 深圳市必易微电子股份有限公司 | Load drive suppression circuit and load power supply system |
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