CN203632907U - Temperature compensation circuit inhibiting current drift - Google Patents
Temperature compensation circuit inhibiting current drift Download PDFInfo
- Publication number
- CN203632907U CN203632907U CN201320648235.2U CN201320648235U CN203632907U CN 203632907 U CN203632907 U CN 203632907U CN 201320648235 U CN201320648235 U CN 201320648235U CN 203632907 U CN203632907 U CN 203632907U
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- circuit
- temperature
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- compensation
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- 230000002401 inhibitory effect Effects 0.000 title abstract 2
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 235000019640 taste Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to a temperature compensation circuit inhibiting current drift. The circuit comprises a light modulation conversion circuit and a PWM control output circuit. The circuit is characterized in that the circuit further comprises a temperature compensation circuit having a temperature sensing sensor and a current control circuit, the light modulation conversion circuit outputs a voltage reference signal to the temperature compensation circuit, voltage compensation for the voltage reference signal is carried out by the temperature compensation circuit under adjustment of the temperature sensing sensor, a current signal is transmitted to an input end of the current control circuit, after processing through the current control circuit, a level signal is outputted to an input end of the PWM control output circuit, and the PWM control output circuit outputs a pulse signal after temperature compensation. The circuit is advantaged in that the circuit has a simple structure, a high-precision negative temperature resistor is utilized to connect in series with a common resistor and then is connected in parallel with a current sampling reference point, when the temperature changes, current reference changes along with the temperature, so the current of an LED lamp is maintained to be in a constant state.
Description
Technical field
The utility model belongs to circuit control technology field, relates to a kind of temperature benefit that suppresses current drift and tastes circuit, is applied in LED constant-current circuit.
Background technology
In traditional LED constant-current circuit, the drift that the variation of temperature is produced to electric current and voltage due to semiconductor, cause the lost of life of LED lamp, so, in LED power supply, increase a kind of LED temperature benefit and taste circuit, can guarantee like this LED power supply energy constant output current in different temperature environments, guarantee LED working stability.
Summary of the invention
The utility model, in order to overcome the defect of prior art, has designed a kind of temperature benefit that suppresses current drift and has tasted circuit, further controls current constant by the mode of temperature-compensating.
The technical solution adopted in the utility model is, a kind of temperature that suppresses current drift is mended and is tasted circuit, circuit structure comprises that light modulation change-over circuit and PWM control output circuit, key is: in described circuit structure, also comprise temperature-compensation circuit and the current control circuit with temp-sensitive sensor, light modulation change-over circuit output voltage reference signal is to temperature-compensation circuit, temperature-compensation circuit carries out after voltage compensation voltage reference signal under the adjusting of temp-sensitive sensor, input by current signal transfer to current control circuit, current control circuit is processed the input of rear outputs level signals to PWM control output circuit, PWM controls the pulse signal after the compensation of output circuit output temperature.
Described temperature-compensation circuit comprises current sampling resistor and is connected in parallel on the 4th resistance and the temp-sensitive sensor at current sampling resistor two ends, resistance is connected with temp-sensitive sensor, current sampling resistor is connected operating voltage with the input in parallel of the 4th resistance and temp-sensitive sensor, and output in parallel connects the input of current control circuit.
Described current control circuit comprises comparator, be connected to the second resistance, the second diode and the optocoupler of comparator output terminal and the first resistance of driving optocoupler, be connected to current response loop between comparator negative terminal and output, that formed by the 5th electric capacity, the 6th electric capacity and the 5th resistance, the anode of comparator receives the current signal of exporting after temperature-compensation circuit compensation, and the output of comparator connects the input of PWM control output circuit after optocoupler control.
Described PWM control output circuit comprise PWM drive chip, primary coil, secondary coil and be connected to primary coil and secondary coil between supporting rectifier diode and filter capacitor.
Described temp-sensitive sensor is negative temperature resistance.
Circuit theory of the present utility model is, light modulation change-over circuit is the circuit that a kind of and extraneous dim signal connects, convert user's multi-signal to LED power supply constant current required constant current signal, then the feedback benefit that is added to LED power supply is tasted network, mend and taste circuit comparison with temperature, control again current loop, by the duty ratio of loop control PWM, the final constant electric current of output of controlling.
The beneficial effects of the utility model are, circuit structure is simple, utilize high-precision negative temperature resistance to connect with conventional resistance and then be connected in parallel on current sampling datum mark, in the time of variations in temperature, current reference will change along with the variation of temperature, makes the electric current on LED lamp keep a constant state.
Accompanying drawing explanation
Fig. 1 is block diagram of the present utility model.
Fig. 2 is specific embodiment of the utility model circuit theory diagrams.
Embodiment
A kind of temperature that suppresses current drift is mended and is tasted circuit, circuit structure comprises that light modulation change-over circuit 1 and PWM control output circuit 4, key is: in described circuit structure, also comprise temperature-compensation circuit 2 and the current control circuit 3 with temp-sensitive sensor, light modulation change-over circuit 1 output voltage reference signal is to temperature-compensation circuit 2, temperature-compensation circuit 2 carries out after voltage compensation voltage reference signal under the adjusting of temp-sensitive sensor, input by current signal transfer to current control circuit 3, current control circuit 3 is processed the input of rear outputs level signals to PWM control output circuit 4, PWM controls the pulse signal after output circuit 4 output temperature compensation.
Described temperature-compensation circuit 2 comprises current sampling resistor R3 and is connected in parallel on the 4th resistance R 4 and the temp-sensitive sensor NTC at current sampling resistor R3 two ends, resistance R 4 is connected with temp-sensitive sensor NTC, current sampling resistor R3 is connected operating voltage with the input in parallel of the 4th resistance R 4 and temp-sensitive sensor NTC, and output in parallel connects the input of current control circuit 3.
Described current control circuit 3 comprises comparator U2, be connected to the first resistance R 1 of the second resistance R 2, the second diode D2 and optocoupler U1 and the driving optocoupler U1 of comparator U2 output, be connected to current response loop between comparator U2 negative terminal and output, that formed by the 5th capacitor C 5, the 6th capacitor C 6 and the 5th resistance R 5, the current signal of output after anode reception temperature-compensation circuit 2 compensation of comparator U2, the output of comparator U2 connects the input of PWM control output circuit 4 after optocoupler U1 controls.
Described PWM control output circuit 4 comprise PWM drive chip U3, primary coil L1, secondary coil L2 and be connected to primary coil L1 and secondary coil L2 between supporting rectifier diode D1 and filter capacitor.
Described temp-sensitive sensor NTC is negative temperature resistance.
The utility model in the specific implementation, the first resistance R 1 provides current drives to optocoupler U1, the second diode D2, the second resistance R 2, comparator U2 form current controlled circuit, a current sampling datum mark of output composition of current sampling resistor R3, light modulation change-over circuit 1, the 4th resistance R 4 and temperature of temperature sensor NTC composition are mended and are tasted circuit, and the 5th capacitor C 5, the 6th capacitor C 6, the 5th resistance R 5 form a current response loop.
Light modulation change-over circuit 1 can convert user's one dim signal to a reference voltage, and in the time that signal changes, benchmark also changes simultaneously.The anode of comparator U2 is current detecting end, the short and empty disconnected principle from the void of comparator, and in the time that the input anode "+" of comparator U2 changes, the input negative terminal "-" of comparator U2 also can change simultaneously.The output of comparator U2 can be exported a low level simultaneously and control optocoupler U1, removes to control elementary PWM again drive chip U3 to adjust duty ratio by optocoupler U1, reaches like this function of light modulation.If temperature benefit is tasted main circuit and mend the drift of tasting electric current in the time that temperature is changed.
Claims (5)
1. a temperature benefit that suppresses current drift is tasted circuit, circuit structure comprises that light modulation change-over circuit (1) and PWM control output circuit (4), it is characterized in that: in described circuit structure, also comprise temperature-compensation circuit (2) and the current control circuit (3) with temp-sensitive sensor, light modulation change-over circuit (1) output voltage reference signal is to temperature-compensation circuit (2), temperature-compensation circuit (2) carries out after voltage compensation voltage reference signal under the adjusting of temp-sensitive sensor, input by current signal transfer to current control circuit (3), after current control circuit (3) processing, outputs level signals is controlled the input of output circuit (4) to PWM, PWM controls the pulse signal after the compensation of output circuit (4) output temperature.
2. a kind of temperature that suppresses current drift according to claim 1 is mended and is tasted circuit, it is characterized in that: described temperature-compensation circuit (2) comprises current sampling resistor (R3) and is connected in parallel on the 4th resistance (R4) and the temp-sensitive sensor (NTC) at current sampling resistor (R3) two ends, resistance (R4) is connected with temp-sensitive sensor (NTC), current sampling resistor (R3) is connected operating voltage with the input in parallel of the 4th resistance (R4) and temp-sensitive sensor (NTC), and output in parallel connects the input of current control circuit (3).
3. a kind of temperature that suppresses current drift according to claim 1 is mended and is tasted circuit, it is characterized in that: described current control circuit (3) comprises comparator (U2), be connected to second resistance (R2) of comparator (U2) output, the second diode (D2), and first resistance (R1) of optocoupler (U1) and driving optocoupler (U1), be connected between comparator (U2) negative terminal and output, by the 5th electric capacity (C5), the current response loop of the 6th electric capacity (C6) and the 5th resistance (R5) composition, the anode of comparator (U2) receives the current signal of exporting after temperature-compensation circuit (2) compensation, the output of comparator (U2) connects the input of PWM control output circuit (4) after optocoupler (U1) is controlled.
4. a kind of temperature that suppresses current drift according to claim 1 is mended and is tasted circuit, it is characterized in that: described PWM control output circuit (4) comprise PWM drive chip (U3), primary coil (L1), secondary coil (L2) and be connected to primary coil (L1) and secondary coil (L2) between supporting rectifier diode (D1) and filter capacitor.
5. a kind of temperature that suppresses current drift according to claim 1 and 2 is mended and is tasted circuit, it is characterized in that: described temp-sensitive sensor (NTC) is negative temperature resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320648235.2U CN203632907U (en) | 2013-10-21 | 2013-10-21 | Temperature compensation circuit inhibiting current drift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320648235.2U CN203632907U (en) | 2013-10-21 | 2013-10-21 | Temperature compensation circuit inhibiting current drift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203632907U true CN203632907U (en) | 2014-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320648235.2U Expired - Lifetime CN203632907U (en) | 2013-10-21 | 2013-10-21 | Temperature compensation circuit inhibiting current drift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203632907U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI802200B (en) * | 2022-01-04 | 2023-05-11 | 新加坡商光寶科技新加坡私人有限公司 | Current driving circuit |
-
2013
- 2013-10-21 CN CN201320648235.2U patent/CN203632907U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI802200B (en) * | 2022-01-04 | 2023-05-11 | 新加坡商光寶科技新加坡私人有限公司 | Current driving circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140604 |
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| CX01 | Expiry of patent term |