CN104185333A - Constant-current constant-voltage circuit and illuminating device - Google Patents
Constant-current constant-voltage circuit and illuminating device Download PDFInfo
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- CN104185333A CN104185333A CN201310188805.9A CN201310188805A CN104185333A CN 104185333 A CN104185333 A CN 104185333A CN 201310188805 A CN201310188805 A CN 201310188805A CN 104185333 A CN104185333 A CN 104185333A
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Abstract
The invention is suitable for switching power technology, and provides a constant-current constant-voltage circuit. The constant-current constant-voltage circuit comprises the components of: a single-end flyback module, a constant-current constant-voltage feedback module, an optoelectric coupler and a PWM control module; wherein the single-end flyback module outputs a constant-voltage current; the constant-current constant-voltage feedback module controls on-off of the optoelectric coupler and magnitude of the output current according to the magnitude of the current of the anode of a rectifier diode D1; and the PWM control module adjusts the duty ratio of a PWM signal according to on/off of the optoelectric coupler and the magnitude of the output current for controlling on time of Q1 of the MOS tube and controlling a secondary winding N2 for performing constant-current constant-voltage output. The PWM control module controls on/off of Q1 of the MOS tube according to on/off and magnitude of the output current for realizing controllable voltage and current output from a primary winding N1. The output voltage and output current are constant. Relatively simple structure of the whole circuit and low cost are realized.
Description
Technical field
The invention belongs to field of switch power, relate in particular to a kind of constant-current constant-voltage circuit and lighting device.
Background technology
At present, LED lamp is generally used constant voltage constant current power to drive, the LED constant voltage constant current power of prior art mostly adopts various application-specific integrated circuits (Integrated Circuit, integrated circuit) charger integrated circuit and error sampling amplifier, control IC cost used is high, can cause peripheral cell more.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of constant-current constant-voltage circuit, is intended to solve traditional constant-current constant-voltage circuit control IC cost high, can cause the more problem of peripheral cell.
The embodiment of the present invention is achieved in that a kind of constant-current constant-voltage circuit, comprises single-ended reverse exciting module, constant current constant voltage feedback module, photoelectrical coupler and PWM control module, wherein,
Described single-ended reverse exciting module comprises the armature winding N1 intercoupling, secondary winding N2, metal-oxide-semiconductor Q1, the first end access power supply of described armature winding N1, the second end is connected with metal-oxide-semiconductor Q1 drain electrode, described metal-oxide-semiconductor Q1 source ground, described armature winding N1 two ends are also parallel with the first absorbing circuit, the peak current producing when described the first absorbing circuit absorbs described armature winding N1 and oppositely recovers, described secondary winding N2 the first output connects the positive pole of rectifier diode D1, the second output head grounding, between described rectifier diode D1 negative pole and ground, be connected with filter capacitor C1, the positive pole output constant voltage electric current of described rectifier diode D1,
The input of described constant current constant voltage feedback module is connected with described secondary winding N2 the first output, output is connected with the input of described photoelectrical coupler, and described constant current constant voltage feedback module is controlled break-make and the output current size of described photoelectrical coupler according to the anodal size of current of described rectifier diode D1;
The current feedback terminal of described PWM control module is connected with the output of described photoelectrical coupler, pwm signal output is connected with the grid of metal-oxide-semiconductor Q1, according to the duty ratio of the break-make of described photoelectrical coupler and output current size adjustment pwm signal, to control the ON time of metal-oxide-semiconductor Q1, to control described secondary winding N2, carries out constant current constant voltage output.
Another object of the embodiment of the present invention is to provide a kind of lighting device, comprises described light fixture, also comprises above-mentioned constant-current constant-voltage circuit, and described constant-current constant-voltage circuit is connected with described light fixture.
Above-mentioned constant-current constant-voltage circuit is controlled break-make and the output current size of controlling photoelectrical coupler according to the output current size of single-ended reverse exciting module by constant current constant voltage feedback module, PWM control module is controlled to realize the electric current and voltage that armature winding N1 is exported according to the break-make of the break-make of photoelectrical coupler and output current size module controls metal-oxide-semiconductor Q1, the electric current and voltage of output is constant, and whole circuit structure is comparatively simple, cost is low.
Accompanying drawing explanation
Fig. 1 is the module map of the constant-current constant-voltage circuit that provides of the embodiment of the present invention;
Fig. 2 is the schematic diagram of the constant-current constant-voltage circuit that provides of the embodiment of the present invention.
Embodiment
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, 2, show module map and the schematic diagram of the constant-current constant-voltage circuit that an embodiment provides.
Constant-current constant-voltage circuit 100 comprises single-ended reverse exciting module 110, constant current constant voltage feedback module 120, photoelectrical coupler U1 and PWM(Pulse Width Modulation, pulse-width modulation) control module 130.
Described single-ended reverse exciting module 110 comprises flyback transformer T1 and metal-oxide-semiconductor Q1, flyback transformer T1 comprises armature winding N1 and the secondary winding N2 intercoupling, the first end access power supply of armature winding N1, the second end is connected with metal-oxide-semiconductor Q1 drain electrode, metal-oxide-semiconductor Q1 source ground, armature winding N1 two ends are also parallel with the first absorbing circuit 112, the peak current that the first absorbing circuit 112 absorption armature winding N1 produce while oppositely recovering, secondary winding N2 the first output connects the positive pole of rectifier diode D1, the second output head grounding, between rectifier diode D1 negative pole and ground, be connected with filter capacitor C1, the positive pole output constant voltage electric current of rectifier diode D1.In the present embodiment, filter capacitor C1 is big capacity electrolyte capacitor, in the situation that meeting circuit performance, coordinates other component parameters, and filter capacitor C1 can be the capacitor element of other character.
The input of constant current constant voltage feedback module 120 is connected with secondary winding N2 the first output, output is connected with the input of described photoelectrical coupler U1, and described constant current constant voltage feedback module 120 is controlled break-make and the output current size of described photoelectrical coupler U1 according to the anodal size of current of described rectifier diode D1.
The current feedback terminal 1 of PWM control module 130 is connected with the output of photoelectrical coupler U1, the pwm signal output 4 of PWM control module 130 is connected with the grid of metal-oxide-semiconductor Q1, PWM control module 130 according to the duty ratio of the break-make of described photoelectrical coupler U1 and output current size adjustment pwm signal, to control the ON time of metal-oxide-semiconductor Q1, to control described secondary winding N2, carry out constant current constant voltage output.
Foregoing circuit is more controlled than the electric current and voltage of armature winding N1 being exported with realization according to the ON time of the break-make of photoelectrical coupler U1 and output current size module controls metal-oxide-semiconductor Q1 by PWM control module 130, the electric current and voltage of output is constant, and whole circuit structure is comparatively simple, cost is low.In the present embodiment, if the output voltage electric current of foregoing circuit increases, cause the output current of photoelectrical coupler U1 to increase, 130 of PWM control modules reduce the duty ratios of pwm signals so, the ON time of metal-oxide-semiconductor Q1 is declined, the induced voltage electric current of secondary winding N2 just declines, and makes the electric current and voltage of circuit output be no more than about definite value.
In a preferred embodiment, constant current constant voltage feedback module 120 comprises three-terminal voltage-stabilizing pipe U1, triode Q2, divider resistance R5 and divider resistance R6, three-terminal voltage-stabilizing pipe U1 is electrically connected to the positive pole of rectifier diode D1, the control utmost point of three-terminal voltage-stabilizing pipe U1 be electrically connected to the positive pole of rectifier diode D1 and with self anodic bonding.
The collector electrode of triode Q2 is with the negative electrode of described three-terminal voltage-stabilizing pipe U1 and the input of photoelectrical coupler U1 is connected, the grounded emitter of triode Q2, the anodic bonding of triode Q2 base stage and three-terminal voltage-stabilizing pipe U1, the base stage of triode Q2 is electrically connected to the anode of described three-terminal voltage-stabilizing pipe U1, the anode of described three-terminal voltage-stabilizing pipe U1 is through divider resistance R5 ground connection, and divider resistance R6 is in parallel with described divider resistance R5.
In another preferred embodiment, constant current constant voltage feedback module 120 also comprises current-limiting resistance R1, current-limiting resistance R2, divider resistance R3, divider resistance R4.The negative electrode of three-terminal voltage-stabilizing pipe U1 is electrically connected to the positive pole of described rectifier diode D1 through current-limiting resistance R1, and the control utmost point of three-terminal voltage-stabilizing pipe U1 is electrically connected to the positive pole of described rectifier diode D1 through current-limiting resistance R2 and through divider resistance R3 and anodic bonding.
Constant current constant voltage feedback module 120 also comprises capacitor C 7 and resistance R 14, is connected to the negative electrode of three-terminal voltage-stabilizing pipe U1 and controls between the utmost point after capacitor C 7 and resistance R 14 are connected in series.14 couples of three-terminal voltage-stabilizing pipe U1 of capacitor C 7 and resistance R redeeming.
The collector electrode of described triode Q2 is connected with the negative electrode of described three-terminal voltage-stabilizing pipe U1 and the input of photoelectrical coupler U1, the grounded emitter of described triode Q2, the base stage of described triode Q2 is through the anodic bonding of divider resistance R4 and described three-terminal voltage-stabilizing pipe U1, the anode of described three-terminal voltage-stabilizing pipe U1 is through divider resistance R5 ground connection, and a divider resistance R6 is in parallel with described divider resistance R5.
Flyback transformer T1 during single-ended reverse exciting module 110 also comprises also comprises auxiliary winding N3 and diode D2, the current-limiting resistance R7 with described armature winding N1 coupling, and when constant-current constant-voltage circuit 100 work, the induced electromotive force of auxiliary winding N3 is as the working power of PWM control module 130.Described auxiliary winding N3, diode D2, resistance R 7 are serially connected between the voltage input end and ground of described PWM control module 130, and wherein the positive pole of diode D2 is connected with the first end of auxiliary winding N3, negative pole is connected to the voltage input end of described PWM control module 130 by resistance R 7.In charging circuit when work,, diode D2 first can dividing potential drop current limliting to resistance R 7 after the induced current rectification of auxiliary winding N3, and both are to 130 power supply protections of PWM control module.
In a preferred embodiment, described single-ended reverse exciting module 110 also comprises voltage-stabiliser tube ZD1 and inductor L1, the positive pole of described rectifier diode D1 is connected with the negative electrode of described voltage-stabiliser tube ZD1 and the first end of described inductor L1, the plus earth of described voltage-stabiliser tube ZD1, the second end of described inductor L1 is connected with the input of described constant current constant voltage feedback module 120 as the output of described constant-current constant-voltage circuit 100.Inductor L1 can not suddenly change the output current of foregoing circuit, and voltage-stabiliser tube ZD1 can export the output voltage of foregoing circuit in voltage stabilizing.
In a preferred embodiment, constant-current constant-voltage circuit 100 also comprises capacitor C 2, current-limiting resistance R8, current-limiting resistance R9, and the current-limiting resistance R8 that the voltage input end 3 of described PWM control module 130 is also connected in series through described capacitor C 2 ground connection, process is connected with described power supply with current-limiting resistance R9.In the present embodiment, capacitor C 2 is electrochemical capacitor, and in other embodiments, capacitor C 2 can be other electric capacity.When charging circuit starts to start work, the voltage of power supply output is by current-limiting resistance R8, current-limiting resistance R9, conducting electric capacity C2 voltage regulation filtering, for PWM control module 130300 provides starting resistor.
In a preferred embodiment, described PWM control module 130 comprises PWM chip U3, the second absorbing circuit 132 and filter capacitor C3, the pwm signal output 4 of described PWM chip U3 is connected with the grid of described metal-oxide-semiconductor Q1 through described the second absorbing circuit 132, the current feedback terminal 1 of described PWM chip U3 is through described filter capacitor C3 ground connection, and the second absorbing circuit 132 absorbs and discharge the peak current producing when described metal-oxide-semiconductor Q1 break-make and described armature winding N1 oppositely recover.
In a preferred embodiment, described PWM chip U3 is specially UC3842 chip, and described the second absorbing circuit 132 comprises current-limiting resistance R10, diode D3, divider resistance R11, capacitor C 4.The voltage input end of PWM chip U3, current feedback terminal, pwm signal output are as voltage input end, current feedback terminal, the pwm signal output of PWM control module.
The pwm signal output 4 of this chip is connected with the grid of described metal-oxide-semiconductor Q1 through described current-limiting resistance R10, the drain electrode of described metal-oxide-semiconductor Q1 is connected with its grid through described capacitor C 4, the source electrode of described metal-oxide-semiconductor Q1 is connected with its grid through described divider resistance R11, and the anode of described diode D3 is connected with the grid of described metal-oxide-semiconductor Q1, negative electrode is connected with the pwm signal output 4 of described chip.
In a preferred embodiment, described the first absorbing circuit 112 comprises resistance R 12, resistance R 13, capacitor C 5 and diode D4, one end after described resistance R 12, resistance R 13 and capacitor C 4 parallel connections is connected with the first end of described armature winding N1, the other end after described resistance R 12, resistance R 13 and capacitor C 4 parallel connections is connected with the negative pole of described diode D4, and the positive pole of described diode D4 is connected with the second end of described armature winding N1.The peak current that absorbing circuit 220 absorption armature winding N1 produce while oppositely recovering, thus metal-oxide-semiconductor Q1 is had to protective effect.
In a preferred embodiment, constant-current constant-voltage circuit 100 also comprises EMC module 140 and rectifier BR1, two inputs of described EMC module 140 are connected with two outputs (AC1 and AC2) of AC power, two outputs are connected with two inputs of described rectifier BR1 respectively, described EMC module 140 is for common mode disturbances and the differential mode interference of AC power described in filtering, the cathode output end of described rectifier BR1 is connected with the first end of armature winding N1 as the output of above-mentioned power supply, the cathode output end of rectifier BR1 is through filter capacitor C6 ground connection and output cathode voltage, the cathode output end ground connection of described rectifier BR1.
EMC module 140 comprises thermistor NTC, filter capacitor C8, fuse F1, resistance R 15, resistance R 16 and inductor L2.
Inductor L2 comprises the first inductance and the second inductance intercoupling, the input of the first inductance is connected with an output terminals A C1 of AC power through fuse F1, the input of the second inductance is connected with another output terminals A C2 of AC power through thermistor NTC, the output of the output of the first inductance and the second inductance is connected with two inputs of rectifier BR1 respectively, filter capacitor C8 is connected between the input of the first inductance and the input of the second inductance, resistance R 15, after resistance R 16 series connection, be connected between the input of the first inductance and the input of the second inductance.
In addition, a kind of lighting device is also provided, has comprised described light fixture (not shown) and above-mentioned constant-current constant-voltage circuit 100, the output of constant-current constant-voltage circuit 100 is connected with described light fixture, the structure of constant-current constant-voltage circuit 100 and principle thereof as mentioned above, repeat no more here.
The output current of constant-current constant-voltage circuit 100 rises, the collector voltage of triode Q2 rises, when base voltage > emitter voltage, because collector voltage > base voltage, so triode Q2 opens, in linear magnification region, collector current rises with the output current of constant-current constant-voltage circuit 100, photoelectrical coupler U1 conducting and output current rise, PWM chip U3 reduces duty ratio, make the armature winding N1 energy decreases of flyback transformer T1, secondary winding N2 energy decreases, the output current of constant-current constant-voltage circuit 100 declines, complete a circulation constant current.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a constant-current constant-voltage circuit, is characterized in that, comprises single-ended reverse exciting module, constant current constant voltage feedback module, photoelectrical coupler and PWM control module, wherein,
Described single-ended reverse exciting module comprises the armature winding N1 intercoupling, secondary winding N2, metal-oxide-semiconductor Q1, the first end access power supply of described armature winding N1, the second end is connected with metal-oxide-semiconductor Q1 drain electrode, described metal-oxide-semiconductor Q1 source ground, described armature winding N1 two ends are also parallel with the first absorbing circuit, the peak current producing when described the first absorbing circuit absorbs described armature winding N1 and oppositely recovers, described secondary winding N2 the first output connects the positive pole of rectifier diode D1, the second output head grounding, between described rectifier diode D1 negative pole and ground, be connected with filter capacitor C1, the positive pole output constant voltage electric current of described rectifier diode D1,
The input of described constant current constant voltage feedback module is connected with described secondary winding N2 the first output, output is connected with the input of described photoelectrical coupler, and described constant current constant voltage feedback module is controlled break-make and the output current size of described photoelectrical coupler according to the anodal size of current of described rectifier diode D1;
The current feedback terminal of described PWM control module is connected with the output of described photoelectrical coupler, pwm signal output is connected with the grid of metal-oxide-semiconductor Q1, according to the duty ratio of the break-make of described photoelectrical coupler and output current size adjustment pwm signal, to control the ON time of metal-oxide-semiconductor Q1, to control described secondary winding N2, carries out constant current constant voltage output.
2. constant-current constant-voltage circuit as claimed in claim 1, is characterized in that, described constant current constant voltage feedback module comprises three-terminal voltage-stabilizing pipe, triode Q2, wherein,
The negative electrode of described three-terminal voltage-stabilizing pipe is electrically connected to, controls that the utmost point is electrically connected to the positive pole of described rectifier diode D1 through current-limiting resistance R2 and through divider resistance R3 and its anodic bonding through current-limiting resistance R1 and the positive pole of described rectifier diode D1;
The collector electrode of described triode Q2 is with the negative electrode of described three-terminal voltage-stabilizing pipe and the input of photoelectrical coupler is connected, grounded emitter, the base stage of described triode Q2 is through the anodic bonding of divider resistance R4 and described three-terminal voltage-stabilizing pipe, the anode of described three-terminal voltage-stabilizing pipe is through divider resistance R5 ground connection, and a divider resistance R6 is in parallel with described divider resistance R5.
3. constant-current constant-voltage circuit as claimed in claim 1 or 2, it is characterized in that, described single-ended reverse exciting module also comprises auxiliary winding N3 and diode D2, the current-limiting resistance R7 with described armature winding N1 coupling, described auxiliary winding N3, diode D2, resistance R 7 are serially connected between the voltage input end and ground of described PWM control module, and wherein the positive pole of diode D2 is connected with the first end of auxiliary winding N3, negative pole is connected to the voltage input end of described PWM control module by resistance R 7.
4. constant-current constant-voltage circuit as claimed in claim 3, it is characterized in that, described single-ended reverse exciting module also comprises voltage-stabiliser tube ZD1 and inductor L1, the positive pole of described rectifier diode D1 is connected with the negative electrode of described voltage-stabiliser tube ZD1 and the first end of described inductor L1, the plus earth of described voltage-stabiliser tube ZD1, the second end of described inductor L1 is connected with the input of described constant current constant voltage feedback module as the output of described constant-current constant-voltage circuit.
5. constant-current constant-voltage circuit as claimed in claim 1, it is characterized in that, also comprise capacitor C 2, current-limiting resistance R8, current-limiting resistance R9, the current-limiting resistance R8 that the voltage input end of described PWM control module is also connected in series through described capacitor C 2 ground connection, process is connected with described power supply with current-limiting resistance R9.
6. constant-current constant-voltage circuit as claimed in claim 1, it is characterized in that, described PWM control module comprises PWM chip, the second absorbing circuit and filter capacitor C3, the pwm signal output of described PWM chip is connected with the grid of described metal-oxide-semiconductor Q1 through described the second absorbing circuit, the current feedback terminal of described PWM chip is through described filter capacitor C3 ground connection, and the second absorbing circuit absorbs and discharge the peak current producing when described metal-oxide-semiconductor Q1 break-make and described armature winding N1 oppositely recover.
7. the constant-current constant-voltage circuit as described in claim 1 or 6, is characterized in that, described the second absorbing circuit comprises current-limiting resistance R10, diode D3, divider resistance R11, capacitor C 4;
The pwm signal output of this chip is connected with the grid of described metal-oxide-semiconductor Q1 through described current-limiting resistance R10, the drain electrode of described metal-oxide-semiconductor Q1 is connected with its grid through described capacitor C 4, the source electrode of described metal-oxide-semiconductor Q1 is connected with its grid through described divider resistance R11, and the anode of described diode D3 is connected with the grid of described metal-oxide-semiconductor Q1, negative electrode is connected with the pwm signal output of described chip.
8. constant-current constant-voltage circuit according to claim 1, it is characterized in that, described the first absorbing circuit comprises resistance R 12, resistance R 13, capacitor C 5 and diode D4, one end after described resistance R 12, resistance R 13 and capacitor C 4 parallel connections is connected with the first end of described armature winding N1, the other end is connected with the negative pole of described diode D4, and the positive pole of described diode D4 is connected with the second end of described armature winding N1.
9. constant-current constant-voltage circuit according to claim 1, it is characterized in that, also comprise EMC module and rectifier, two inputs of described EMC module are connected with two outputs of AC power, two outputs are connected with two inputs of described rectifier respectively, described EMC module is for common mode disturbances and the differential mode interference of AC power described in filtering, the cathode output end of described rectifier as the output of described power supply through filter capacitor C6 ground connection and output cathode voltage, the cathode output end ground connection of described rectifier.
10. a lighting device, comprises described light fixture, it is characterized in that, also comprises the constant-current constant-voltage circuit as described in claim 1 to 9 any one, and described constant-current constant-voltage circuit is connected with described light fixture.
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| CN109032042A (en) * | 2018-09-11 | 2018-12-18 | 中国地质大学（武汉） | A kind of discharge circuit with constant pressure and flow |
| 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 |
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| CN105934017A (en) * | 2016-03-17 | 2016-09-07 | 上海遍发电子科技有限公司 | Switching power supply feedback control circuit and single-stage PFC efficient constant current power supply drive circuit |
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| 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 |
| CN114189024A (en) * | 2021-12-20 | 2022-03-15 | 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 |
| 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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