CN204217187U - Former limit feedback constant-current supply and current regulating circuit thereof - Google Patents
Former limit feedback constant-current supply and current regulating circuit thereof Download PDFInfo
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- CN204217187U CN204217187U CN201420766863.5U CN201420766863U CN204217187U CN 204217187 U CN204217187 U CN 204217187U CN 201420766863 U CN201420766863 U CN 201420766863U CN 204217187 U CN204217187 U CN 204217187U
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Abstract
A kind of former limit feedback constant-current supply and current regulating circuit thereof, circuit is connected with DC power supply, comprise transformer, N-type metal-oxide-semiconductor, power drives chip, the first divider resistance, sample resistance and adjustable potentiometer, the source electrode of described metal-oxide-semiconductor is by described sample resistance ground connection, and grid connects the pwm signal output of described power drives chip; The current sample end of described power drives chip connects the source electrode of described MOS by described first divider resistance, and the current sample end of described power drives chip is by described adjustable potentiometer ground connection; Wherein, by regulating the resistance of described adjustable potentiometer to make the duty ratio of described pwm signal change, with the size of current regulating the secondary of described transformer to export.Above-mentioned former limit feedback constant current source current regulating circuit, by regulating the resistance being connected to the adjustable potentiometer of the current sample end of power drives chip, can change the size of current of the power circuit output that output current is defined by current sample end, this circuit is simple and cost is low.
Description
Technical field
The utility model relates to field of switch power, is specifically related to a kind of former limit feedback constant-current supply and current regulating circuit thereof.
Background technology
LED(Light-Emitting Diode, light-emitting diode) illuminating product entered the ripe application stage at present.Walk at present is commercial lighting in front end.Household lighting fixtures kind is more, and the LED lamp application of tunable optical is more and more extensive.LED drive power technology is showing improvement or progress day by day, and former limit feedback technique, owing to eliminating secondary feedback circuit, has cost low, and the simple advantage of circuit, widely applies.The secondary feedback technology of, complex circuit high compared to cost, and the shortcoming of former limit feedback technique to be electric power outputting current regulate also is a difficult point, make the application cost of the LED lamp of tunable optical high.
Summary of the invention
The utility model provides a kind of former limit feedback constant current source current regulating circuit, and to solve, current regulating circuit cost in prior art is high, the problem of complex circuit.
The utility model provides a kind of former limit feedback constant current source current regulating circuit, is connected, comprises transformer, N-type metal-oxide-semiconductor, power drives chip, the first divider resistance, sample resistance and adjustable potentiometer with DC power supply, wherein:
The one end on the former limit of described transformer is connected with the anode of described DC power supply, the drain electrode of metal-oxide-semiconductor described in another termination, and the secondary of described transformer connects load; The source electrode of described metal-oxide-semiconductor is by described sample resistance ground connection, and grid connects the pwm signal output of described power drives chip; The current sample end of described power drives chip connects the source electrode of described MOS by described first divider resistance, and the current sample end of described power drives chip is by described adjustable potentiometer ground connection;
Wherein, by regulating the resistance of described adjustable potentiometer to make the duty ratio of described pwm signal change, with the size of current regulating the secondary of described transformer to export.
Preferably, also comprise the first electric capacity, between the current sample end that described first electric capacity is connected to described power drives chip and ground.
Preferably, also comprise the second divider resistance, between the current sample end that described second divider resistance is connected to described power drives chip and described adjustable potentiometer.
Preferably, also comprise uptake pathway, described uptake pathway is connected between the source electrode of described metal-oxide-semiconductor and drain electrode.
Preferably, described uptake pathway comprises absorption resistance and Absorption Capacitance, and one end of described absorption resistance is connected with one end of Absorption Capacitance, the source electrode of metal-oxide-semiconductor described in another termination of described absorption resistance, the source electrode of metal-oxide-semiconductor described in another termination of described Absorption Capacitance.
Preferably, also comprise current-limiting resistance, the pwm signal output of power drives chip described in the first termination of described current-limiting resistance, the grid of metal-oxide-semiconductor described in the second termination.
Preferably, also comprise consumption network, described consumption network is in parallel with described current-limiting resistance.
Preferably, described consumption network comprises dead resistance and the first diode, and the anode of described first diode connects the second end of described current-limiting resistance, and negative electrode connects the first end of described dead resistance, the first end of current-limiting resistance described in the second termination of described dead resistance.
In addition, additionally provide a kind of former limit feedback constant-current supply, for powering for LED, comprise above-mentioned former limit feedback constant current source current regulating circuit, described LED is connected as the secondary of described load with described transformer.
Above-mentioned former limit feedback constant current source current regulating circuit is by regulating the resistance being connected to the adjustable potentiometer of the current sample end of power drives chip, can change the size of current of the power circuit output that output current is defined by current sample end, this circuit is simple and cost is low.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of limit, the utility model preferred embodiment Central Plains feedback constant current source current regulating circuit.
Embodiment
In order to make the technical problems to be solved in the utility model, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, limit, the utility model preferred embodiment Central Plains feedback constant current source current regulating circuit, be connected with DC power supply, circuit comprises transformer T1, N-channel MOS pipe Q1, power drives chip U1, sample resistance R1, the first divider resistance R2 and adjustable potentiometer Rs.The model of power drives chip U1 is the chip that OB3330 or other functions are identical.
The one end on former limit of transformer T1 is connected with the anode of DC power supply, the drain electrode of another termination metal-oxide-semiconductor Q1, the secondary of transformer T1 connects load, particularly, this DC power supply can be provided by DC-DC chip, or provides after carrying out rectifying and wave-filtering by current rectifying and wave filtering circuit to alternating voltage.The source electrode of metal-oxide-semiconductor Q1 is by sample resistance R1 ground connection, and the grid of metal-oxide-semiconductor Q1 meets the pwm signal output GATE of power drives chip U1; The current sample end CS of power drives chip U1 connects the source electrode of MOS by the first divider resistance R2, and the current sample end CS of power drives chip U1 is by adjustable potentiometer Rs ground connection; So, by regulating the resistance of adjustable potentiometer Rs to make the duty ratio of pwm signal change, with the size of current regulating the secondary of transformer T1 to export, former limit is namely regulated to feed back the size of current of constant-current supply output.
Preferably, former limit feedback constant current source current regulating circuit also comprises the first electric capacity C1, between the current sample end CS that the first electric capacity C1 is connected to power drives chip U1 and ground.
Preferably, former limit feedback constant current source current regulating circuit also comprises the second divider resistance R3, between the current sample end CS that the second divider resistance R3 is connected to power drives chip U1 and adjustable potentiometer Rs.
Preferably, former limit feedback constant current source current regulating circuit also comprises uptake pathway 100, and uptake pathway 100 is connected between the source electrode of metal-oxide-semiconductor Q1 and drain electrode.Uptake pathway 100 comprises absorption resistance R4 and Absorption Capacitance C2, and one end of absorption resistance R4 is connected with one end of Absorption Capacitance C2, the source electrode of another termination metal-oxide-semiconductor Q1 of absorption resistance R4, the source electrode of another termination metal-oxide-semiconductor Q1 of Absorption Capacitance C2.Its energy absorption, by the existence due to leakage inductance when being conducting to cut-off, will be fallen by R, C by metal-oxide-semiconductor Q1, otherwise can produce a peak voltage and have influence on the reliability of element and cause EMI(electromagnetic interference) problem.
Preferably, former limit feedback constant current source current regulating circuit also comprises current-limiting resistance R5, the pwm signal output GATE of the first termination power drives chip U1 of current-limiting resistance R5, the grid of the second termination metal-oxide-semiconductor Q1.
Preferably, former limit feedback constant current source current regulating circuit also comprises consumption network 200, and consumption network 200 is in parallel with current-limiting resistance R5.Preferably, consumption network 200 comprises dead resistance R6 and the first diode D1, the anode of the first diode D1 connects second end of current-limiting resistance R5, and the negative electrode of the first diode D1 connects the first end of dead resistance R6, the first end of the second termination current-limiting resistance R5 of dead resistance R6.Consumption network 200 is for consuming the excess energy on switching tube (metal-oxide-semiconductor) Q1 grid.
Operation principle: the output current of former limit feedback constant-current supply is defined by the current sample end CS of power drives chip U1, and the model of power drives chip U1 is OB3330, or the chip that other functions are identical.Sampled voltage is from the sample resistance R1 of metal-oxide-semiconductor Q1 lower end.The sampled voltage of sample resistance R1 adds to current sample end CS after the first divider resistance R2 and the second divider resistance R3 and adjustable potentiometer Rs dividing potential drop.The voltage Vcs=(Rs+R3 of the current sample end CS of power drives chip U1)
÷(R2+R3+Rs), can be found out by formula, when the change in resistance of adjustable potentiometer Rs, voltage Vcs is and then change also.Because output current is defined by voltage Vcs voltage, so during the change in resistance of adjustable potentiometer Rs, the output current of former limit feedback constant-current supply also can and then change.
In addition, additionally provide a kind of former limit feedback constant-current supply, for powering for LED, comprise above-mentioned DC power supply and former limit feedback constant current source current regulating circuit, LED is connected as the secondary of load with transformer T1.
Above-mentioned former limit feedback constant current source current regulating circuit, by regulating the resistance being connected to the adjustable potentiometer Rs of the current sample end CS of power drives chip U1, can change the size of current of the former limit feedback constant-current supply output that output current is defined by current sample end CS, this circuit is simple and cost is low.
The above embodiment only have expressed several execution mode of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. a former limit feedback constant current source current regulating circuit, is connected with DC power supply, it is characterized in that, comprise transformer, N-type metal-oxide-semiconductor, power drives chip, the first divider resistance, sample resistance and adjustable potentiometer, wherein:
The one end on the former limit of described transformer is connected with the anode of described DC power supply, the drain electrode of metal-oxide-semiconductor described in another termination, and the secondary of described transformer connects load; The source electrode of described metal-oxide-semiconductor is by described sample resistance ground connection, and grid connects the pwm signal output of described power drives chip; The current sample end of described power drives chip connects the source electrode of described MOS by described first divider resistance, and the current sample end of described power drives chip is by described adjustable potentiometer ground connection;
Wherein, by regulating the resistance of described adjustable potentiometer to make the duty ratio of described pwm signal change, with the size of current regulating the secondary of described transformer to export.
2. former limit feedback constant current source current regulating circuit according to claim 1, is characterized in that, also comprise the first electric capacity, between the current sample end that described first electric capacity is connected to described power drives chip and ground.
3. former limit feedback constant current source current regulating circuit according to claim 1, is characterized in that, also comprise the second divider resistance, between the current sample end that described second divider resistance is connected to described power drives chip and described adjustable potentiometer.
4. the former limit feedback constant current source current regulating circuit according to claim 1,2 or 3, it is characterized in that, also comprise uptake pathway, described uptake pathway is connected between the source electrode of described metal-oxide-semiconductor and drain electrode.
5. former limit feedback constant current source current regulating circuit according to claim 4, it is characterized in that, described uptake pathway comprises absorption resistance and Absorption Capacitance, one end of described absorption resistance is connected with one end of Absorption Capacitance, the source electrode of metal-oxide-semiconductor described in another termination of described absorption resistance, the source electrode of metal-oxide-semiconductor described in another termination of described Absorption Capacitance.
6. the former limit feedback constant current source current regulating circuit according to claim 1,2 or 3, it is characterized in that, also comprise current-limiting resistance, the pwm signal output of power drives chip described in the first termination of described current-limiting resistance, the grid of metal-oxide-semiconductor described in the second termination.
7. former limit feedback constant current source current regulating circuit according to claim 6, it is characterized in that, also comprise consumption network, described consumption network is in parallel with described current-limiting resistance.
8. former limit feedback constant current source current regulating circuit according to claim 7, it is characterized in that, described consumption network comprises dead resistance and the first diode, the anode of described first diode connects the second end of described current-limiting resistance, negative electrode connects the first end of described dead resistance, the first end of current-limiting resistance described in the second termination of described dead resistance.
9. a former limit feedback constant-current supply, for powering for LED, is characterized in that, also comprise the former limit feedback constant current source current regulating circuit described in any one of claim 1 to 8, described LED is connected as the secondary of described load with described transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420766863.5U CN204217187U (en) | 2014-12-09 | 2014-12-09 | Former limit feedback constant-current supply and current regulating circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420766863.5U CN204217187U (en) | 2014-12-09 | 2014-12-09 | Former limit feedback constant-current supply and current regulating circuit thereof |
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| CN204217187U true CN204217187U (en) | 2015-03-18 |
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| CN201420766863.5U Expired - Fee Related CN204217187U (en) | 2014-12-09 | 2014-12-09 | Former limit feedback constant-current supply and current regulating circuit thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016090544A1 (en) * | 2014-12-09 | 2016-06-16 | 深圳市聚作照明股份有限公司 | Primary-side feedback constant current power supply and current regulating circuit |
| CN106793288A (en) * | 2016-12-15 | 2017-05-31 | 广东威创视讯科技股份有限公司 | Led drive circuit |
| CN114235207A (en) * | 2021-12-20 | 2022-03-25 | 珠海格力电器股份有限公司 | Temperature sampling circuit, method, device, equipment, storage medium and electric automobile |
-
2014
- 2014-12-09 CN CN201420766863.5U patent/CN204217187U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016090544A1 (en) * | 2014-12-09 | 2016-06-16 | 深圳市聚作照明股份有限公司 | Primary-side feedback constant current power supply and current regulating circuit |
| CN106793288A (en) * | 2016-12-15 | 2017-05-31 | 广东威创视讯科技股份有限公司 | Led drive circuit |
| CN114235207A (en) * | 2021-12-20 | 2022-03-25 | 珠海格力电器股份有限公司 | Temperature sampling circuit, method, device, equipment, storage medium and electric automobile |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150318 Termination date: 20161209 |