CN211744811U - Switching power supply based on potentiometer dimming - Google Patents
Switching power supply based on potentiometer dimming Download PDFInfo
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- CN211744811U CN211744811U CN202020699365.9U CN202020699365U CN211744811U CN 211744811 U CN211744811 U CN 211744811U CN 202020699365 U CN202020699365 U CN 202020699365U CN 211744811 U CN211744811 U CN 211744811U
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Abstract
The utility model belongs to the technical field of the switching power supply technique and specifically relates to a switching power supply based on potentiometre is adjusted luminance, including main power circuit and dimmer circuit, dimmer circuit includes the potentiometre, operational amplifier, the steady voltage chip, first steady voltage diode and opto-coupler feedback device, operational amplifier's positive input and steady voltage chip's input are connected with main power circuit's positive output respectively, the output of steady voltage chip is connected with the one end of potentiometre and operational amplifier's negative input respectively, the other end of potentiometre is connected with operational amplifier's negative input through first steady voltage diode, operational amplifier's output and opto-coupler feedback device's feedback input are connected, opto-coupler feedback device's feedback output and main power circuit's feedback input are connected. The utility model discloses a dimming circuit that operational amplifier, steady voltage chip and potentiometre are constituteed adjusts luminance, makes output voltage and the linear relation of the access resistance of potentiometre, and the effect of adjusting luminance is steady continuous.
Description
Technical Field
The utility model belongs to the technical field of switching power supply technique and specifically relates to a switching power supply based on potentiometre is adjusted luminance.
Background
The existing switching power supply is basically designed to be constant current output, constant voltage output or the combination of the constant current output and the constant voltage output according to different load types, the setting of the output voltage or the output current is basically realized by completely depending on the setting of the reference voltage of a hardware circuit or the setting of a sampling resistance value, and the output voltage or the output current of the output end of the power supply is usually collected to control the output power of the power supply. However, the output states required by the customers are very different, for example, the dimmable power supply is often used for LED lighting, and the existing dimmable power supply on the market is often poor in softness and fineness of adjustment of modulated light due to an imperfect circuit structure, sometimes a stroboscopic phenomenon occurs, and the working stability is not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the current fine and smooth degree of the soft degree of light and the adjustment that the power modulation of adjusting luminance comes out relatively poor, stroboscopic phenomenon can appear sometimes, defect that job stabilization nature is not high.
In order to realize the above-mentioned purpose, the utility model discloses a switching power supply based on potentiometre is adjusted luminance, including main power circuit and dimmer circuit, dimmer circuit includes the potentiometre, operational amplifier, the steady voltage chip, first steady voltage diode and opto-coupler feedback device, operational amplifier's positive input and steady voltage chip's input are connected with main power circuit's positive output end respectively, the output of steady voltage chip is connected with the one end of potentiometre and operational amplifier's negative input end respectively, the other end of potentiometre is connected with operational amplifier's negative input end through first steady voltage diode, operational amplifier's output and opto-coupler feedback device's feedback input end are connected, opto-coupler feedback device's feedback output end is connected with main power circuit's feedback input end.
Preferably, the voltage regulator further comprises a first inductor, two ends of one side of the first inductor are respectively connected with two ends of the potentiometer, and two ends of the other side of the first inductor are respectively connected with the output end of the voltage stabilizing chip and the anode of the first voltage stabilizing diode.
Preferably, the voltage stabilization chip is a HT7133-5 type chip.
Preferably, the main power circuit is a constant current output power circuit, and comprises a rectification filter module, a conversion module, a transformer and a constant current output module which are connected in sequence.
Furthermore, the rectifying and filtering module comprises a second inductor, a rectifying bridge, a thermistor, an EMI filtering capacitor, an EMI filtering resistor and a safety resistor, wherein the thermistor, the EMI filtering capacitor and the EMI filtering resistor are respectively connected to two ends of one side of the second inductor in parallel, the thermistor is connected to one end of one side of the second inductor in series and used for connecting a live wire, two ends of the other side of the second inductor are respectively connected with the rectifying bridge, and the output end of the rectifying bridge is connected with the input end of the conversion module.
Furthermore, the conversion module comprises a control chip and a switch tube, the output end of the rectification filter module is respectively connected with the power supply end of the control chip and the primary winding of the transformer, the control end of the control chip is connected with the grid electrode of the switch tube, the current detection end of the control chip is connected with the source electrode of the switch tube, the drain electrode of the switch tube is connected with one end of the primary winding of the transformer, and the voltage feedback end of the control chip is connected with the feedback output end of the optocoupler feedback device.
Furthermore, the conversion module further comprises a first clamping resistor, a second clamping resistor, a clamping capacitor and a clamping diode, wherein the first clamping resistor is connected with the clamping capacitor in series, the second clamping resistor is connected with the clamping capacitor in parallel, one end of the clamping capacitor is connected with one end of a primary winding of the transformer, one end of the first clamping resistor is connected with a cathode of the clamping diode, and an anode of the clamping diode is connected with the other end of the primary winding of the transformer.
Furthermore, the constant current output module comprises an output diode and a third inductor, wherein the anode of the output diode is connected with one end of the secondary winding of the transformer, and the cathode of the output diode is connected with the third inductor in series.
Furthermore, the constant current output module further comprises an output filter capacitor and an output load resistor, wherein the output filter capacitor and the output load resistor are respectively connected to two ends of the secondary winding of the transformer in parallel.
The utility model has the advantages that: dimming is carried out through a dimming circuit consisting of the operational amplifier, the voltage stabilizing chip and the potentiometer, and the actual output voltage and a voltage signal regulated by the potentiometer are compared in an operational mode, so that the output voltage and the access resistance value of the potentiometer form a linear relation, and the dimming effect is stable and continuous.
Drawings
FIG. 1: the utility model discloses circuit structure schematic diagram of an embodiment of switching power supply based on potentiometre is adjusted luminance.
FIG. 2: the utility model discloses circuit structure schematic diagram of another embodiment of switching power supply based on potentiometre is adjusted luminance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will be further described with reference to the following embodiments and accompanying drawings.
Referring to fig. 1, in an embodiment, a switching power supply based on potentiometer dimming includes a main power circuit and a dimming circuit.
Specifically, the dimming circuit mainly includes a potentiometer RP, an operational amplifier U1, a voltage regulation chip U2, a first voltage regulation diode D1 and an optical coupling feedback device OC, wherein a positive input end of the operational amplifier U1 and an input end of the voltage regulation chip U2 are respectively connected with a positive output end of the main power circuit, an output end of the voltage regulation chip U2 is respectively connected with one end of the potentiometer RP and a negative input end of the operational amplifier U1, the other end of the potentiometer RP is connected with a negative input end of the operational amplifier U1 through the first voltage regulation diode D1, an output end of the operational amplifier U1 is connected with a feedback input end of the optical coupling feedback device OC, and a feedback output end of the optical coupling feedback device OC is connected with a feedback input end of the main power circuit.
The dimming circuit further comprises a first inductor T1 for eliminating common mode interference between the potentiometer RP and the voltage stabilizing chip U2, two ends of one side of the first inductor T1 are respectively connected with two ends of the potentiometer RP, and two ends of the other side of the first inductor T1 are respectively connected with an output end of the voltage stabilizing chip U2 and an anode of the first voltage stabilizing diode D1.
Referring to fig. 2, in another embodiment, based on the above embodiment, the main power circuit of the switching power supply for potentiometer dimming is a constant current output power circuit, which mainly includes a rectifying and filtering module 1, a converting module 2, a transformer T3 and a constant current output module 3, which are connected in sequence.
The rectifying and filtering module 1 is configured to eliminate an interference signal in an ac input signal and convert the interference signal into a dc input signal, and mainly includes a second inductor T2, a rectifier bridge BR, a thermistor TVR, an EMI filter capacitor C1, EMI filter resistors R1-R2, and a safety resistor F1, where the thermistor TVR, the EMI filter capacitor C1, and the EMI filter resistors R1-R2 are respectively connected in parallel to two ends of one side of the second inductor T2, the thermistor TVR is connected in series to one end of one side of the second inductor T2 for connecting a live wire, two ends of the other side of the second inductor T2 are respectively connected to the rectifier bridge BR, and an output end of the rectifier bridge BR is connected to an input end of the conversion module 2.
The conversion module 2 is used for controlling and regulating a voltage signal flowing to the transformer T3 and mainly comprises a control chip U3 and a switching tube Q1, the output end of the rectification filter module 1 is respectively connected with the power supply end of the control chip U3 and the primary winding of the transformer T3, and a voltage division resistor R3-R4 is connected between the power supply end of the control chip U3 and the output end of the rectification filter module 1 in series; the control chip U3 adjusts the output of the conversion module 2 through the on-off frequency of the switching tube Q1, specifically, the control end of the control chip U3 is connected with the gate of the switching tube Q1, the current detection end of the control chip U3 is connected with the source of the switching tube Q1, the drain of the switching tube Q1 is connected with one end of the primary winding of the transformer T3, and the voltage feedback end of the control chip U3 is connected with the feedback output end of the optocoupler feedback device OC.
The conversion module 2 is further provided with a clamping structure, which comprises a first clamping resistor R5, a second clamping resistor R6, a clamping capacitor C2 and a clamping diode D2, wherein the first clamping resistor R5 is connected in series with the clamping capacitor C2, the second clamping resistor R6 is connected in parallel with the clamping capacitor C2, one end of the clamping capacitor C2 is connected with one end of the primary winding of the transformer T3, one end of the first clamping resistor R5 is connected with the cathode of the clamping diode D2, and the anode of the clamping diode D2 is connected with the other end of the primary winding of the transformer T3.
The constant current output module 3 is configured to stably output the converted electrical signal, and mainly includes an output diode D3 and a third inductor T4, where the output diode D3 rectifies the electrical signal again, the third inductor T4 removes differential mode interference in the output electrical signal, specifically, an anode of the output diode D3 is connected to one end of a secondary winding of the transformer T3, and a cathode of the output diode D3 is connected in series to the third inductor T4.
The constant current output module 3 further comprises output filter capacitors C3-C4 and output load resistors R7-R8, the output filter capacitors C3-C4 and the output load resistors R7-R8 are respectively connected in parallel to two ends of a secondary winding of the transformer T3, the output filter capacitors C3-C4 are used for removing alternating current interference, and the output load resistors R7-R8 are used for releasing electric energy of the output filter capacitors C3-C4.
In this embodiment, the voltage regulator U2 is HT7133-5, the operational amplifier U1 is LM358, and the control U3 is NCP 1252.
In practical application, the light modulation circuit collects the output voltage of the positive output end of the constant current output module 3 in real time, part of the output voltage directly flows into the positive input end of the operational amplifier U1, part of the output voltage flows into the power supply end of the operational amplifier U1, part of the output voltage flows into the input end of the voltage stabilizing chip U2, the output signal of the voltage stabilizing chip U2 flows into the negative input end of the operational amplifier U1, the operational amplifier U1 carries out operational comparison according to the two inflow signals and outputs an operational result, the operational result is fed back to the control chip U3 through the optical coupling feedback device OC, the signal flowing to the negative input terminal of the operational amplifier U1 is linearly related to the resistance of the potentiometer RP, therefore, the output voltage of the main power circuit is linearly related to the access resistance value of the potentiometer RP, the output power is more stable and can be manually controlled, the output power is linear and continuous, and the stroboflash of the light source is avoided.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalent changes may be made to some of the technical features of the embodiments. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a switching power supply based on potentiometre is adjusted luminance, its characterized in that, includes main power circuit and dimmer circuit, dimmer circuit includes potentiometre, operational amplifier, voltage stabilizing chip, first zener diode and opto-coupler feedback device, operational amplifier's positive input and voltage stabilizing chip's input are connected with main power circuit's positive output respectively, voltage stabilizing chip's output is connected with the one end of potentiometre and operational amplifier's negative input respectively, the other end of potentiometre is connected with operational amplifier's negative input through first zener diode, operational amplifier's output and opto-coupler feedback device's feedback input are connected, opto-coupler feedback device's feedback output and main power circuit's feedback input are connected.
2. The switching power supply based on potentiometer dimming according to claim 1, further comprising a first inductor, wherein two ends of one side of the first inductor are respectively connected with two ends of the potentiometer, and two ends of the other side of the first inductor are respectively connected with the output end of the voltage stabilizing chip and the anode of the first voltage stabilizing diode.
3. A switching power supply as claimed in claim 1 wherein the voltage regulation chip is a HT7133-5 type chip.
4. A switching power supply based on potentiometer dimming according to claim 1, characterized in that the main power circuit is a constant current output power circuit comprising a rectifying and filtering module, a converting module, a transformer and a constant current output module connected in sequence.
5. A switching power supply based on potentiometer dimming according to claim 4, wherein the rectifier filter module comprises a second inductor, a rectifier bridge, a thermistor, an EMI filter capacitor, an EMI filter resistor and a safety resistor, the thermistor, the EMI filter capacitor and the EMI filter resistor are respectively connected in parallel with two ends of one side of the second inductor, the thermistor is connected in series with one end of one side of the second inductor for connecting a live wire, two ends of the other side of the second inductor are respectively connected with the rectifier bridge, and an output end of the rectifier bridge is connected with an input end of the conversion module.
6. A switching power supply based on potentiometer dimming according to claim 4, characterized in that the conversion module comprises a control chip and a switching tube, the output terminal of the rectification filter module is connected to the power terminal of the control chip and the primary winding of the transformer respectively, the control terminal of the control chip is connected to the gate of the switching tube, the current detection terminal of the control chip is connected to the source of the switching tube, the drain of the switching tube is connected to one terminal of the primary winding of the transformer, and the voltage feedback terminal of the control chip is connected to the feedback output terminal of the optocoupler feedback device.
7. The switching power supply based on potentiometer dimming according to claim 6, wherein the conversion module further comprises a first clamping resistor, a second clamping resistor, a clamping capacitor and a clamping diode, the first clamping resistor and the clamping capacitor are connected in series, the second clamping resistor and the clamping capacitor are connected in parallel, one end of the clamping capacitor is connected with one end of the primary winding of the transformer, one end of the first clamping resistor is connected with the cathode of the clamping diode, and the anode of the clamping diode is connected with the other end of the primary winding of the transformer.
8. The potentiometer dimming based switching power supply according to claim 4, wherein the constant current output module comprises an output diode and a third inductor, wherein an anode of the output diode is connected with one end of the secondary winding of the transformer, and a cathode of the output diode is connected in series with the third inductor.
9. The switching power supply based on potentiometer dimming according to claim 8, wherein the constant current output module further comprises an output filter capacitor and an output load resistor, and the output filter capacitor and the output load resistor are respectively connected in parallel to two ends of the secondary winding of the transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020699365.9U CN211744811U (en) | 2020-04-29 | 2020-04-29 | Switching power supply based on potentiometer dimming |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020699365.9U CN211744811U (en) | 2020-04-29 | 2020-04-29 | Switching power supply based on potentiometer dimming |
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| CN211744811U true CN211744811U (en) | 2020-10-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224948A (en) * | 2021-07-08 | 2021-08-06 | 上海芯龙半导体技术股份有限公司 | Switching power supply circuit, switching power supply chip and switching power supply system |
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2020
- 2020-04-29 CN CN202020699365.9U patent/CN211744811U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224948A (en) * | 2021-07-08 | 2021-08-06 | 上海芯龙半导体技术股份有限公司 | Switching power supply circuit, switching power supply chip and switching power supply system |
| CN113224948B (en) * | 2021-07-08 | 2021-09-24 | 上海芯龙半导体技术股份有限公司 | Switching power supply circuit, switching power supply chip and switching power supply system |
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