CN104185333B - Constant-current constant-voltage circuit and illuminator - Google Patents
Constant-current constant-voltage circuit and illuminator Download PDFInfo
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- CN104185333B CN104185333B CN201310188805.9A CN201310188805A CN104185333B CN 104185333 B CN104185333 B CN 104185333B CN 201310188805 A CN201310188805 A CN 201310188805A CN 104185333 B CN104185333 B CN 104185333B
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Abstract
The present invention is applicable to switch power technology, it is provided that a kind of constant-current constant-voltage circuit, including single-ended reverse exciting module, constant current constant voltage feedback module, photoelectrical coupler and PWM control module, wherein, and described single-ended reverse exciting module output constant voltage current；Described constant current constant voltage feedback module controls break-make and the output size of current of described photoelectrical coupler according to the size of current of the positive pole of described commutation diode D1；Described PWM control module carries out constant current constant voltage output with the ON time controlling metal-oxide-semiconductor Q1 to control described secondary windings N2 according to the break-make of described photoelectrical coupler and the dutycycle of output size of current regulation pwm signal.It is controlled with the voltage x current realizing being exported armature winding N1 that PWM control module controls the break-make of metal-oxide-semiconductor Q1 according to this break-make and output size of current module, and the voltage x current of output is constant, and whole circuit structure is relatively simple, low cost.
Description
Technical field
The invention belongs to field of switch power, particularly relate to a kind of constant-current constant-voltage circuit and illuminator.
Background technology
At present, LED generally uses constant voltage constant current power and drives, the LED constant pressure and flow electricity of prior art
Source mostly uses various application-specific integrated circuit (Integrated Circuit, integrated circuit) charger integrated circuit
With error sampling amplifier, control IC cost used is high, and peripheral cell can be caused more.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of constant-current constant-voltage circuit, it is intended to solve traditional constant current permanent
It is high that volt circuit controls IC cost, can cause the problem that peripheral cell is more.
The embodiment of the present invention is achieved in that a kind of constant-current constant-voltage circuit, including single-ended reverse exciting module, perseverance
Stream constant voltage feedback module, photoelectrical coupler and PWM control module, wherein,
Armature winding N1 that described single-ended reverse exciting module includes intercoupling, secondary windings N2, metal-oxide-semiconductor
Q1, the first of described armature winding N1 terminates and is connected with metal-oxide-semiconductor Q1 drain electrode into power supply, the second end, institute
Stating metal-oxide-semiconductor Q1 source ground, described armature winding N1 two ends are also parallel with the first absorbing circuit, described
First absorbing circuit absorb described armature winding N1 Reverse recovery time produce peak current, described secondary around
Group N2 the first outfan connects the positive pole of commutation diode D1, the second output head grounding, described rectification two pole
Being connected between pipe D1 negative pole and ground and have filter capacitor C1, the positive pole output of described commutation diode D1 is constant
Voltage x current；
The input of described constant current constant voltage feedback module is connected with described secondary windings N2 the first outfan, defeated
Going out end to be connected with the input of described photoelectrical coupler, described constant current constant voltage feedback module is according to described rectification two
The size of current of the positive pole of pole pipe D1 controls break-make and the output size of current of described photoelectrical coupler；
The current feedback terminal of described PWM control module is connected with the outfan of described photoelectrical coupler, PWM
Signal output part is connected with the grid of metal-oxide-semiconductor Q1, according to break-make and the output electric current of described photoelectrical coupler
The dutycycle of size adjustment pwm signal with control metal-oxide-semiconductor Q1 ON time with control described secondary around
Group N2 carries out constant current constant voltage output.
The another object of the embodiment of the present invention is to provide a kind of illuminator, including described light fixture, also includes
Above-mentioned constant-current constant-voltage circuit, described constant-current constant-voltage circuit is connected with described light fixture.
Above-mentioned constant-current constant-voltage circuit controls the output electricity according to single-ended reverse exciting module by constant current constant voltage feedback module
Stream size controls break-make and the output size of current of photoelectrical coupler, and PWM control module is according to photoelectric coupling
The break-make of device and output size of current module control the break-make of metal-oxide-semiconductor Q1 to realize armature winding N1 institute
The voltage x current of output is controlled, and the voltage x current of output is constant, and whole circuit structure is relatively simple, low cost.
Accompanying drawing explanation
Fig. 1 is the module map of the constant-current constant-voltage circuit that the embodiment of the present invention provides；
Fig. 2 is the schematic diagram of the constant-current constant-voltage circuit that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearer, with
Lower combination drawings and Examples, are further elaborated to the present invention.Should be appreciated that described herein
Specific embodiment only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, 2, it is shown that the module map of the constant-current constant-voltage circuit that an embodiment provides and schematic diagram.
Constant-current constant-voltage circuit 100 includes single-ended reverse exciting module 110, constant current constant voltage feedback module 120, light thermocouple
Clutch U1 and PWM(Pulse Width Modulation, pulsewidth modulation) control module 130.
Described single-ended reverse exciting module 110 includes flyback transformer T1 and metal-oxide-semiconductor Q1, flyback transformer T1
Including the armature winding N1 intercoupled and secondary windings N2, the first of armature winding N1 terminate into power supply,
Second end is connected with metal-oxide-semiconductor Q1 drain electrode, and metal-oxide-semiconductor Q1 source ground, armature winding N1 two ends are the most also
Being associated with the first absorbing circuit 112, the first absorbing circuit 112 produces when absorbing armature winding N1 Reverse recovery
Peak current, secondary windings N2 the first outfan connects the positive pole of commutation diode D1, the second outfan
Ground connection, is connected between commutation diode D1 negative pole and ground and has filter capacitor C1, and commutation diode D1 is just
Pole output constant voltage current.In the present embodiment, filter capacitor C1 is big capacity electrolyte capacitor,
In the case of meeting circuit performance, coordinating other component parameters, filter capacitor C1 can be other character
Capacitor element.
The input of constant current constant voltage feedback module 120 is connected with secondary windings N2 the first outfan, outfan
Being connected with the input of described photoelectrical coupler U1, described constant current constant voltage feedback module 120 is according to described whole
The break-make that the size of current of the positive pole of stream diode D1 controls described photoelectrical coupler U1 is big with output electric current
Little.
The current feedback terminal 1 of PWM control module 130 is connected with the outfan of photoelectrical coupler U1, PWM
The pwm signal outfan 4 of control module 130 is connected with the grid of metal-oxide-semiconductor Q1, and PWM controls mould
The break-make according to described photoelectrical coupler U1 of block 130 and output size of current regulate accounting for of pwm signal
Empty ratio carries out constant current constant voltage output with the ON time controlling metal-oxide-semiconductor Q1 to control described secondary windings N2.
Foregoing circuit according to the break-make of photoelectrical coupler U1 and exports electric current by PWM control module 130
Big little module controls the ON time ratio of metal-oxide-semiconductor Q1 to realize the voltage electricity being exported armature winding N1
Flowing controlled, the voltage x current of output is constant, and whole circuit structure is relatively simple, low cost.In the present embodiment,
If the output voltage electric current of foregoing circuit increases, the output electric current of photoelectrical coupler U1 is caused to increase, then
PWM control module 130 then reduces the dutycycle of pwm signal so that the ON time of metal-oxide-semiconductor Q1
Declining, the induced voltage electric current of secondary windings N2 just declines so that the voltage x current of circuit output is less than
About definite value.
In a preferred embodiment, constant current constant voltage feedback module 120 includes three-terminal voltage-stabilizing pipe U1, audion
Q2, divider resistance R5 and divider resistance R6, the positive pole of three-terminal voltage-stabilizing pipe U1 and commutation diode D1
Electrical connection, three-terminal voltage-stabilizing pipe U1 control pole be connected with the positive electrical of commutation diode D1 and with self sun
Pole connects.
The negative electrode of the colelctor electrode of audion Q2 and described three-terminal voltage-stabilizing pipe U1 and the input of photoelectrical coupler U1
End connects, the grounded emitter of audion Q2, and audion Q2 base stage connects with the anode of three-terminal voltage-stabilizing pipe U1
Connecing, the base stage of audion Q2 electrically connects with the anode of described three-terminal voltage-stabilizing pipe U1, described three-terminal voltage-stabilizing pipe
The anode of U1 is through divider resistance R5 ground connection, and divider resistance R6 is in parallel with described divider resistance R5.
In an additional preferred embodiment, constant current constant voltage feedback module 120 also includes current-limiting resistance R1, current limliting
Resistance R2, divider resistance R3, divider resistance R4.The negative electrode of three-terminal voltage-stabilizing pipe U1 is through current-limiting resistance R1
Being connected with the positive electrical of described commutation diode D1, the control pole of three-terminal voltage-stabilizing pipe U1 is through current-limiting resistance R2
It is connected with the positive electrical of described commutation diode D1 and is connected with anode through divider resistance R3.
Constant current constant voltage feedback module 120 also includes that electric capacity C7 and resistance R14, electric capacity C7 and resistance R14 go here and there
Connection is connected to the negative electrode of three-terminal voltage-stabilizing pipe U1 and controls between pole after connecting.Electric capacity C7 and resistance R14 is to three
End stabilivolt U1 redeeming.
The negative electrode of the colelctor electrode of described audion Q2 and described three-terminal voltage-stabilizing pipe U1 and photoelectrical coupler U1's
Input connects, and the grounded emitter of described audion Q2, the base stage of described audion Q2 is through divider resistance
R4 is connected with the anode of described three-terminal voltage-stabilizing pipe U1, and the anode of described three-terminal voltage-stabilizing pipe U1 is through divider resistance
R5 ground connection, a divider resistance R6 is in parallel with described divider resistance R5.
Flyback transformer T1 during single-ended reverse exciting module 110 also includes also includes and described armature winding N1 coupling
The auxiliary winding N3 closed and diode D2, current-limiting resistance R7, when constant-current constant-voltage circuit 100 works
The induction electromotive force of auxiliary winding N3 is as the working power of PWM control module 130.Described auxiliary around
Group N3, diode D2, resistance R7 are serially connected in voltage input end and the ground of described PWM control module 130
Between, wherein the positive pole of diode D2 is connected with first end of auxiliary winding N3, negative pole passes through resistance R7
It is connected to the voltage input end of described PWM control module 130.During charging circuit work, diode D2
First to auxiliary winding N3 faradic current rectification after resistance R7 can dividing potential drop current limliting, both control mould to PWM
130 power supply protections of block.
In a preferred embodiment, described single-ended reverse exciting module 110 also includes stabilivolt ZD1 and inducer
L1, the negative electrode of the positive pole of described commutation diode D1 and described stabilivolt ZD1 and described inducer L1's
First end connects, and the plus earth of described stabilivolt ZD1, second end of described inducer L1 is as described
The outfan of constant-current constant-voltage circuit 100 is connected with the input of described constant current constant voltage feedback module 120.Inductance
Device L1 makes the output electric current of foregoing circuit not suddenly change, and stabilivolt ZD1 makes the output electricity of foregoing circuit
Pressure can export with voltage stabilizing.
In a preferred embodiment, constant-current constant-voltage circuit 100 also includes electric capacity C2, current-limiting resistance R8, limit
Leakage resistance R9, the voltage input end 3 of described PWM control module 130 also through described electric capacity C2 ground connection,
Current-limiting resistance R8 and current-limiting resistance R9 through being connected in series are connected with described power supply.In the present embodiment,
Electric capacity C2 is electrochemical capacitor, and in other embodiments, electric capacity C2 can be other electric capacity.At charged electrical
When road starts to start work, the voltage of power supply output is by current-limiting resistance R8, current-limiting resistance R9, electric conduction
Hold C2 voltage regulation filtering, provide for PWM control module 130300 and start voltage.
In a preferred embodiment, described PWM control module 130 includes PWM chip U3, the second suction
Receiving circuit 132 and filter capacitor C3, the pwm signal outfan 4 of described PWM chip U3 is through described
Second absorbing circuit 132 is connected with the grid of described metal-oxide-semiconductor Q1, the electric current of described PWM chip U3
Feedback end 1 absorbs and discharges described metal-oxide-semiconductor through described filter capacitor C3 ground connection, the second absorbing circuit 132
The peak current produced when Q1 break-make and described armature winding N1 Reverse recovery.
In a preferred embodiment, described PWM chip U3 is specially UC3842 chip, and described second inhales
Receive circuit 132 and include current-limiting resistance R10, diode D3, divider resistance R11, electric capacity C4.PWM core
The voltage input end of sheet U3, current feedback terminal, pwm signal outfan are as the electricity of PWM control module
Pressure input, current feedback terminal, pwm signal outfan.
The pwm signal outfan 4 of this chip is through the grid of described current-limiting resistance R10 Yu described metal-oxide-semiconductor Q1
Pole connects, and the drain electrode of described metal-oxide-semiconductor Q1 is connected with its grid through described electric capacity C4, described metal-oxide-semiconductor
The source electrode of Q1 is connected with its grid through described divider resistance R11, and the anode of described diode D3 is with described
The grid of metal-oxide-semiconductor Q1 connects, negative electrode is connected with the pwm signal outfan 4 of described chip.
In a preferred embodiment, described first absorbing circuit 112 includes resistance R12, resistance R13, electricity
Hold the one end after C5 and diode D4, described resistance R12, resistance R13 and electric capacity C4 parallel connection with described
First end of armature winding N1 connects, another after described resistance R12, resistance R13 and electric capacity C4 parallel connection
End is connected with the negative pole of described diode D4, and the positive pole of described diode D4 is with described armature winding N1's
Second end connects.The peak current that absorbing circuit 220 produces when absorbing armature winding N1 Reverse recovery,
Thus effect protected to metal-oxide-semiconductor Q1.
In a preferred embodiment, constant-current constant-voltage circuit 100 also includes EMC module 140 and commutator BR1,
Two inputs of described EMC module 140 connect with two outfans (AC1 and AC2) of alternating current power supply
Connect, two outfans are connected with two inputs of described commutator BR1 respectively, described EMC module 140
For filtering common mode disturbances and the differential mode interference of described alternating current power supply, the cathode output end of described commutator BR1
It is connected with first end of armature winding N1 as the outfan of above-mentioned power supply, the positive pole output of commutator BR1
Hold filtered electric capacity C6 ground connection and output cathode voltage, the cathode output end ground connection of described commutator BR1.
EMC module 140 include critesistor NTC, filter capacitor C8, fuse F1, resistance R15,
Resistance R16 and inducer L2.
Inducer L2 includes the first inductance and the second inductance intercoupled, and the input of the first inductance is through molten
Disconnected device F1 is connected with output terminals A C1 of alternating current power supply, and the input of the second inductance is through critesistor NTC
It is connected with another output terminals A C2 of alternating current power supply, the outfan of the first inductance and the outfan of the second inductance
Being connected with two inputs of commutator BR1 respectively, filter capacitor C8 is connected to the input of the first inductance
And second inductance input between, be connected to the input of the first inductance after resistance R15, resistance R16 series connection
Between end and the input of the second inductance.
Additionally, additionally provide a kind of illuminator, permanent including described light fixture (not shown) and above-mentioned constant current
Volt circuit 100, the outfan of constant-current constant-voltage circuit 100 is connected with described light fixture, constant-current constant-voltage circuit 100
Structure and principle as it has been described above, repeat no more here.
The output electric current of constant-current constant-voltage circuit 100 rises, and the collector voltage of audion Q2 rises, and works as base
Pole tension > emitter voltage time because collector voltage > base voltage, so audion Q2 opens, place
In linear amplification region, collector current rises with the output electric current of constant-current constant-voltage circuit 100 and rises, light
Electric coupler U1 conducting and output electric current rise, and PWM chip U3 reduces dutycycle, makes flyback transformer
The armature winding N1 energy of T1 declines, and secondary windings N2 energy declines, constant-current constant-voltage circuit 100 defeated
Go out electric current to decline, complete a circulation constant current.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Any amendment, equivalent and the improvement etc. made within bright spirit and principle, should be included in the present invention
Protection domain within.
Claims (9)
1. a constant-current constant-voltage circuit, it is characterised in that include that single-ended reverse exciting module, constant current constant voltage feed back mould
Block, photoelectrical coupler and PWM control module, wherein,
Armature winding N1 that described single-ended reverse exciting module includes intercoupling, secondary windings N2, metal-oxide-semiconductor
Q1, the first of described armature winding N1 terminates and is connected with metal-oxide-semiconductor Q1 drain electrode into power supply, the second end, institute
Stating metal-oxide-semiconductor Q1 source ground, described armature winding N1 two ends are also parallel with the first absorbing circuit, described
First absorbing circuit absorb described armature winding N1 Reverse recovery time produce peak current, described secondary around
Group N2 the first outfan connects the positive pole of commutation diode D1, the second output head grounding, described rectification two pole
Being connected between pipe D1 negative pole and ground and have filter capacitor C1, the positive pole output of described commutation diode D1 is constant
Voltage x current；
The input of described constant current constant voltage feedback module is connected with described secondary windings N2 the first outfan, defeated
Going out end to be connected with the input of described photoelectrical coupler, described constant current constant voltage feedback module is according to described rectification two
The size of current of the positive pole of pole pipe D1 controls break-make and the output size of current of described photoelectrical coupler；
The current feedback terminal of described PWM control module is connected with the outfan of described photoelectrical coupler, PWM
Signal output part is connected with the grid of metal-oxide-semiconductor Q1, according to break-make and the output electric current of described photoelectrical coupler
The dutycycle of size adjustment pwm signal with control metal-oxide-semiconductor Q1 ON time with control described secondary around
Group N2 carries out constant current constant voltage output；
Described constant current constant voltage feedback module includes three-terminal voltage-stabilizing pipe, audion Q2, wherein,
The negative electrode of described three-terminal voltage-stabilizing pipe is electrically connected through the positive pole of current-limiting resistance R1 with described commutation diode D1
Connect, control pole and be connected and through divider resistance through the positive electrical of current-limiting resistance R2 with described commutation diode D1
R3 is connected with its anode；
The negative electrode of the colelctor electrode of described audion Q2 and described three-terminal voltage-stabilizing pipe and the input of photoelectrical coupler
Connection, grounded emitter, the base stage of described audion Q2 is through divider resistance R4 and described three-terminal voltage-stabilizing pipe
Anode connects, and the anode of described three-terminal voltage-stabilizing pipe is through divider resistance R5 ground connection, and a divider resistance R6 is with described
Divider resistance R5 is in parallel.
2. constant-current constant-voltage circuit as claimed in claim 1, it is characterised in that described single-ended reverse exciting module
Also include auxiliary winding N3 and diode D2, the current-limiting resistance R7 coupled with described armature winding N1,
Described auxiliary winding N3, diode D2, resistance R7 are serially connected in the voltage input of described PWM control module
Between end and ground, wherein the positive pole of diode D2 is connected with first end of auxiliary winding N3, negative pole passes through electricity
Resistance R7 is connected to the voltage input end of described PWM control module.
3. constant-current constant-voltage circuit as claimed in claim 2, it is characterised in that described single-ended reverse exciting module
Also include stabilivolt ZD1 and inducer L1, the positive pole of described commutation diode D1 and described stabilivolt ZD1
Negative electrode and described inducer L1 first end connect, the plus earth of described stabilivolt ZD1, described electricity
Second end of sensor L1 is as outfan and the described constant current constant voltage feedback module of described constant-current constant-voltage circuit
Input connects.
4. constant-current constant-voltage circuit as claimed in claim 1, it is characterised in that also include electric capacity C2, limit
Leakage resistance R8, current-limiting resistance R9, the voltage input end of described PWM control module is also through described electric capacity
Current-limiting resistance R8 and current-limiting resistance R9 that C2 ground connection, process are connected in series are connected with described power supply.
5. constant-current constant-voltage circuit as claimed in claim 1, it is characterised in that described PWM controls mould
Block includes PWM chip, the second absorbing circuit and filter capacitor C3, the PWM letter of described PWM chip
Number outfan is connected through the grid of described second absorbing circuit with described metal-oxide-semiconductor Q1, described PWM chip
Current feedback terminal through described filter capacitor C3 ground connection, the second absorbing circuit absorbs and discharges described metal-oxide-semiconductor
The peak current produced when Q1 break-make and described armature winding N1 Reverse recovery.
6. constant-current constant-voltage circuit as claimed in claim 5, it is characterised in that described second absorbing circuit bag
Include current-limiting resistance R10, diode D3, divider resistance R11, electric capacity C4；
The pwm signal outfan of this chip is through the grid of described current-limiting resistance R10 Yu described metal-oxide-semiconductor Q1
Connecting, the drain electrode of described metal-oxide-semiconductor Q1 is connected with its grid through described electric capacity C4, described metal-oxide-semiconductor Q1
Source electrode be connected with its grid through described divider resistance R11, the anode of described diode D3 and described MOS
The grid of pipe Q1 connects, negative electrode is connected with the pwm signal outfan of described chip.
Constant-current constant-voltage circuit the most according to claim 1, it is characterised in that described first absorbing circuit
Including resistance R12, resistance R13, electric capacity C5 and diode D4, described resistance R12, resistance R13 and
One end after electric capacity C5 parallel connection is connected with first end of described armature winding N1, the other end and described diode
The negative pole of D4 connects, and the positive pole of described diode D4 is connected with second end of described armature winding N1.
Constant-current constant-voltage circuit the most according to claim 1, it is characterised in that also include EMC module
And commutator, two inputs of described EMC module are connected with two outfans of alternating current power supply, two
Outfan is connected with two inputs of described commutator respectively, and described EMC module is used for filtering described friendship
The common mode disturbances of stream power supply and differential mode interference, the cathode output end of described commutator is as the output of described power supply
Hold filtered electric capacity C6 ground connection and output cathode voltage, the cathode output end ground connection of described commutator.
9. an illuminator, including light fixture, it is characterised in that also include as claim 1 to 8 is arbitrary
Constant-current constant-voltage circuit described in Xiang, described constant-current constant-voltage circuit is connected with described light fixture.
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| CN201310188805.9A CN104185333B (en) | 2013-05-20 | 2013-05-20 | Constant-current constant-voltage circuit and illuminator |
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| CN201310188805.9A CN104185333B (en) | 2013-05-20 | 2013-05-20 | Constant-current constant-voltage circuit and illuminator |
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| CN104185333B true CN104185333B (en) | 2016-09-28 |
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| CN105934017B (en) * | 2016-03-17 | 2018-11-20 | 上海遍发电子科技有限公司 | A kind of Switching Power Supply feedback control circuit and single- stage PFC high-efficiency constant-flow power driving circuit |
| CN106253719A (en) * | 2016-08-06 | 2016-12-21 | 刘超 | A kind of load power source control circuit and device |
| CN106535391B (en) * | 2016-10-11 | 2018-12-25 | 昆山龙腾光电有限公司 | Peak current absorbing circuit and its control method and light emitting diode drive device |
| CN108093517A (en) * | 2017-12-19 | 2018-05-29 | 深圳民爆光电技术有限公司 | A kind of LED constant current constant voltage power supply circuit |
| CN109032042B (en) * | 2018-09-11 | 2023-09-22 | 中国地质大学（武汉） | Discharge circuit with constant voltage and constant current |
| CN109712574A (en) * | 2018-12-20 | 2019-05-03 | 深圳创维－Rgb电子有限公司 | A kind of constant pressure and flow drive control circuit, driving power and television set |
| CN111132418A (en) * | 2019-09-07 | 2020-05-08 | 深圳市慎勇科技有限公司 | Lamp power supply control circuit and method |
| CN114189024B (en) * | 2021-12-20 | 2024-06-11 | 浙江特康电子科技有限公司 | Method and device for realizing constant current mode, switching power supply and medium |
| CN117394292A (en) * | 2023-10-18 | 2024-01-12 | 广州市嘉州科技有限公司 | Overcurrent protection circuit based on adjustable constant current voltage stabilizer CCR |
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