CN111436174A - High-efficient constant current drive power supply equipment - Google Patents
High-efficient constant current drive power supply equipment Download PDFInfo
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- CN111436174A CN111436174A CN201811590039.8A CN201811590039A CN111436174A CN 111436174 A CN111436174 A CN 111436174A CN 201811590039 A CN201811590039 A CN 201811590039A CN 111436174 A CN111436174 A CN 111436174A
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Abstract
The invention discloses high-efficiency constant current driving power supply equipment, wherein a constant current driving power supply comprises a transformer and a power supply management module; the power management module controls the transformer to transform the input electric energy and then output the transformed electric energy, and the transformed electric energy is rectified and filtered by the output rectifying and filtering module to supply power to a load; the constant current driving power supply also comprises an optocoupler feedback module, a pre-starting module and a control module, wherein the control module comprises a current sampling circuit and a constant current control circuit; the pre-starting module is used for controlling the optocoupler feedback module to start working when the power supply is started; the current sampling circuit samples load current and converts the load current into corresponding sampling voltage; the constant current control circuit compares the sampling voltage with a first reference voltage to obtain a current regulation signal, and the current regulation signal is coupled and fed back to the power supply management module through the optocoupler feedback module; and the power supply management module adjusts the output current of the transformer according to the current adjusting signal. The technical scheme of the invention can reduce the cost of the constant current driving power supply and simplify the circuit.
Description
Technical Field
The invention relates to the technical field of constant current power supplies, in particular to high-efficiency constant current driving power supply equipment.
Background
the power management module controls the transformer to transform input electric energy and then output the transformed electric energy, and supplies power to an L ED load after the transformed electric energy is rectified and filtered by the output rectifying and filtering module, and meanwhile, the power management module regulates the output current of the transformer according to a signal fed back by the optical coupler, so that the current output is constant.
in the constant current control in the prior art, voltage division control is performed on the voltage output by the transformer by controlling the gate voltage of the power switch tube, so that the voltage balance between two ends of the LED load is maintained.
Disclosure of Invention
The invention aims to provide high-efficiency constant-current driving power supply equipment, which solves the problems of complex circuit and high production cost in the background technology.
In order to achieve the purpose, the technical scheme of the invention is as follows: a high-efficiency constant-current driving power supply device comprises a transformer and a power supply management module; the power management module controls the transformer to transform the input electric energy and then output the transformed electric energy to supply power to the load; the constant current driving power supply further comprises an optocoupler feedback module, a pre-starting module and a control module, wherein the control module comprises a current sampling circuit and a constant current control circuit, one end of the pre-starting module is connected with the output end of the transformer, and the other end of the pre-starting module is connected with the input end of the constant current control circuit; the pre-starting module is used for controlling the optocoupler feedback module to start working when the power supply is started; the current sampling circuit samples the load current and converts the load current into corresponding sampling voltage; the constant current control circuit compares the sampling voltage with a first reference voltage to obtain a current regulation signal, and the current regulation signal is coupled and fed back to the power management module through the optocoupler feedback module; and the power supply management module adjusts the output current of the transformer according to the current adjusting signal.
Preferably, the input end of the transformer is connected to a power supply, the controlled end of the transformer is connected to the control end of the power management module, and the output end of the transformer is connected to one end of the load; the other end of the load is connected with the sampling end of the current sampling circuit, and the output end of the current sampling circuit is connected with the input end of the constant current control circuit; the output end of the constant current control circuit is connected with the input end of the optocoupler feedback module, and the output end of the optocoupler feedback module is connected with the feedback end of the power management module.
Preferably, the current sampling circuit comprises a first resistor, and the constant current control circuit comprises a first operational amplifier, a second resistor and a first capacitor; the first end of the first resistor is connected with the output end of the load, and the second end of the first resistor is grounded; the non-inverting input end of the first operational amplifier is connected with a first reference voltage, the inverting input end of the first operational amplifier is connected with the first end of the first resistor, and the output end of the first operational amplifier is connected with the input end of the optocoupler feedback module; the first end of the second resistor is connected with the output end of the first operational amplifier, the second end of the second resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the inverting input end of the first operational amplifier.
Preferably, the constant current driving power supply further comprises an overvoltage protection module, and the overvoltage protection module comprises a voltage sampling circuit and a voltage comparison circuit; the voltage sampling circuit samples load voltage; the voltage comparison circuit compares the load voltage with a second reference voltage to obtain a level signal; the voltage comparison circuit outputs a voltage regulation signal to the power management module according to the level signal, and the power management module regulates the output voltage of the transformer according to the voltage regulation signal.
Preferably, the overvoltage protection module further comprises a self-locking circuit, a self-locking end of the self-locking circuit is connected with an input end of the optocoupler feedback module, and an output end of the self-locking circuit is connected with an input end of the voltage comparison circuit; and when the load voltage acquired by the voltage sampling circuit exceeds the threshold voltage, the self-locking circuit outputs a protection signal and latches the output state of the voltage comparison circuit.
Preferably, the voltage sampling circuit comprises a fifth resistor and a sixth resistor, and the voltage comparison circuit comprises a second operational amplifier; a first end of the fifth resistor is connected with the input end of the load, a second end of the fifth resistor is connected with a first end of the sixth resistor, and a second end of the sixth resistor is grounded; the non-inverting input end of the second operational amplifier is connected to a second reference voltage, the inverting input end of the second operational amplifier is connected with the first end of the sixth resistor, and the output end of the second operational amplifier is connected with the input end of the optocoupler feedback module.
Preferably, the self-locking circuit comprises an eighth resistor, a second diode, a first triode and a first power supply; a first end of the eighth resistor is connected with the first power supply, a second end of the eighth resistor is connected with a collector of the first triode, a base of the first triode is connected with an input end of the optocoupler feedback module, and an emitter of the first triode is grounded; and the anode of the second diode is connected with the collector of the first triode, and the cathode of the second diode is connected with the input end of the voltage comparison circuit.
the invention relates to an L ED intelligent dimming constant current power supply, which is formed by arranging a transformer, a power supply management module, an optocoupler feedback module and a control module, wherein the control module comprises a current sampling circuit and a constant current control circuit, load current is collected by the current sampling circuit and converted into sampling voltage, the sampling voltage is compared with first reference voltage by the constant current control circuit, a current adjusting signal output by the constant current control circuit changes along with the sampling voltage, the optocoupler feedback module couples the current adjusting signal to the power supply management module, and the power supply management module controls the output current of the transformer according to the current adjusting signal so that the output current is constant.
Drawings
FIG. 1 is a block diagram of the basic functions of the constant current power supply of the present invention;
Fig. 2 is a block diagram of a further function of the constant current power supply of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
referring to fig. 1, the invention provides a street lamp power aging system, which comprises an L ED constant current power circuit, a power constant current driving chip IC1 in the circuit, with the model of CSC8935, pin 1 of IC1 being a chip ground terminal, pin 2 being an open circuit protection voltage regulating terminal, pin 3 being a dead pin, pin 4 being a chip power terminal, pins 5 and 6 being internal high voltage power tube drains, pins 7 and 8 being current sampling terminals,
the LED light-emitting diode power supply circuit also comprises a first rectifying and filtering circuit consisting of rectifying diodes D1, D2, D3, D4 and a filtering capacitor C1, wherein the input end of the first rectifying and filtering circuit is electrically connected with the commercial power P, one path of the output end of the first rectifying and filtering circuit is electrically connected with the 4 pins of the IC1 through a 4-pin power supply resistor R2, one end of a decoupling capacitor C2 is connected with the point of a 4-pin power supply resistor R2, the other end of the decoupling capacitor C2 is connected with the commercial power P, the 2 pins of the IC1 are electrically connected with a 2-pin external open-circuit protection voltage regulating resistor R3, the other end of R3 is communicated with the commercial power P, the other path of the output end of the first rectifying and filtering circuit is electrically connected with L ED light-emitting diodes D14 to Dn, the other ends of the light-emitting diodes D14 to Dn are respectively connected with one end of the filtering capacitor C3 and one end of an inductor L,
Current sampling resistors R4, R5 and R6 which are arranged in parallel are externally connected between pins 7 and 8 of the IC1 and the negative pole of the power supply.
The maximum output power of the IC1 chip is 36W, the single power of D14-Dn is 1W, and the number of D14-Dn is 24-36.
The LED lamp further comprises a segmented dimming circuit, wherein the segmented dimming circuit comprises a segmented dimming chip IC2 with the model of NS1834, pin 1 of IC2 is a chip grounding end, pins 2, 7 and 8 are power output ends, pin 3 is an external reset end, pin 4 is a control signal input end, pin 5 is a chip power supply end, and pin 6 is a mode setting end.
A pin 4 of the IC2 is connected with one end of a pin 4 signal input resistor R9, the other end of the pin 4 signal input resistor R9 is connected with one end of a current-limiting power supply resistor R8, the other end of the current-limiting power supply resistor R8 is connected with the output end of a second rectifying and filtering circuit consisting of a filter capacitor C5, a rectifying diode D6, a rectifying diode D7, a rectifying diode D8 and a rectifying diode D9, the input end of the second rectifying and filtering circuit is connected with a mains supply P through a voltage reduction capacitor C4, and R1 is a discharge resistor of the C4;
The other path of the output end of the second rectifying and filtering circuit is connected with one end of an isolating diode D11, the other end of the isolating diode D11 is respectively electrically connected with pins 5 and 6 of an IC2 and a decoupling capacitor C7, the other end of the decoupling capacitor C7 is connected with a mains supply P, a pin 1 of an IC2 is connected with the mains supply P, a pin 7 of an IC2 is connected with a coil terminal pin 85 of a relay J1, a pin 8 of the IC2 is connected with a coil terminal pin 85 of a relay J2, and a coil terminal pin 86 of the relays J1 and J2 is connected with a power supply;
D12 and D13 are freewheeling diodes.
A pin 87 of the relay J1 is electrically connected with the sampling resistor R5, a pin 87 of the relay J2 is electrically connected with the sampling resistor R6, and pins 30 of the relays J1 and J2 are electrically connected with the negative electrode of the commercial power P.
the LED street lamp power supply comprises an L ED street lamp power supply 1, a current converging device 2, a current limiter 5 and an on-off switch, wherein the current limiter 5 is connected in series between the L ED street lamp power supply 1 and the current converging device 2, the on-off switch is controlled by a logic controller in an on-off mode and is connected with the logic controller, the on-off switch is a static switch 6, and the alternating current power supply is 220V alternating current.
The working principle is as follows:
When the power VCC is turned on, the output voltage rises, the voltage of the reverse phase input end of the first operational amplifier U1 is increased through the fourteenth resistor R14 and the third capacitor C3, so that the output of the first operational amplifier U1 is negative, the fourth diode D4 is turned on, the optocoupler feedback module 30 starts working, the output constant current is stable, and the situation that the voltage of the non-phase input end of the operational amplifier is greater than the voltage of the reverse phase input end, so that the output is positive, and the optocoupler feedback module 30 cannot normally start working is avoided. The driving end GATE of the power management chip U4 is connected to the GATE of the MOS transistor, the drain of the MOS transistor is connected to the first end of the first primary winding, and the second end of the first primary winding is connected to the input end of the preceding stage rectification filter circuit 90; the source of the MOS transistor is connected with the first end of a fifteenth resistor R15, and the second end of the fifteenth resistor R15 is grounded; an over-current detection end CS of the power management chip U4 is connected with a first end of the fifteenth resistor R15; the power supply end VDD of the power supply management chip U4 is connected with the first end of the second primary winding, the second end of the second primary winding is grounded, and the feedback end of the power supply management chip U4 is connected with the output end of the optocoupler feedback module.
Claims (8)
1. A high-efficiency constant-current driving power supply device comprises a transformer and a power supply management module; the power management module controls the transformer to transform the input electric energy and then output the transformed electric energy to supply power to the load; the constant-current driving power supply is characterized by further comprising an optocoupler feedback module, a pre-starting module and a control module, wherein the control module comprises a current sampling circuit and a constant-current control circuit, one end of the pre-starting module is connected with the output end of the transformer, and the other end of the pre-starting module is connected with the input end of the constant-current control circuit; the pre-starting module is used for controlling the optocoupler feedback module to start working when the power supply is started; the current sampling circuit samples the load current and converts the load current into corresponding sampling voltage; the constant current control circuit compares the sampling voltage with a first reference voltage to obtain a current regulation signal, and the current regulation signal is coupled and fed back to the power management module through the optocoupler feedback module; and the power supply management module adjusts the output current of the transformer according to the current adjusting signal.
2. The high-efficiency constant-current driving power supply device according to claim 1, wherein an input end of the transformer is connected to a power supply, a controlled end of the transformer is connected to a control end of the power management module, and an output end of the transformer is connected to one end of the load; the other end of the load is connected with the sampling end of the current sampling circuit, and the output end of the current sampling circuit is connected with the input end of the constant current control circuit; the output end of the constant current control circuit is connected with the input end of the optocoupler feedback module, and the output end of the optocoupler feedback module is connected with the feedback end of the power management module.
3. A high-efficiency constant current driving power supply device according to claim 2, wherein the current sampling circuit comprises a first resistor, and the constant current control circuit comprises a first operational amplifier, a second resistor, a first capacitor; the first end of the first resistor is connected with the output end of the load, and the second end of the first resistor is grounded; the non-inverting input end of the first operational amplifier is connected with a first reference voltage, the inverting input end of the first operational amplifier is connected with the first end of the first resistor, and the output end of the first operational amplifier is connected with the input end of the optocoupler feedback module; the first end of the second resistor is connected with the output end of the first operational amplifier, the second end of the second resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the inverting input end of the first operational amplifier.
4. The high-efficiency constant-current driving power supply device according to claim 3, wherein the constant-current driving power supply further comprises an overvoltage protection module, and the overvoltage protection module comprises a voltage sampling circuit and a voltage comparison circuit; the voltage sampling circuit samples load voltage; the voltage comparison circuit compares the load voltage with a second reference voltage to obtain a level signal; the voltage comparison circuit outputs a voltage regulation signal to the power management module according to the level signal, and the power management module regulates the output voltage of the transformer according to the voltage regulation signal.
5. The high-efficiency constant-current driving power supply device according to claim 4, wherein the overvoltage protection module further comprises a self-locking circuit, a self-locking end of the self-locking circuit is connected with an input end of the optocoupler feedback module, and an output end of the self-locking circuit is connected with an input end of the voltage comparison circuit; and when the load voltage acquired by the voltage sampling circuit exceeds the threshold voltage, the self-locking circuit outputs a protection signal and latches the output state of the voltage comparison circuit.
6. The high-efficiency constant-current driving power supply device according to claim 5, wherein the voltage sampling circuit comprises a fifth resistor and a sixth resistor, and the voltage comparison circuit comprises a second operational amplifier; a first end of the fifth resistor is connected with the input end of the load, a second end of the fifth resistor is connected with a first end of the sixth resistor, and a second end of the sixth resistor is grounded; the non-inverting input end of the second operational amplifier is connected to a second reference voltage, the inverting input end of the second operational amplifier is connected with the first end of the sixth resistor, and the output end of the second operational amplifier is connected with the input end of the optocoupler feedback module.
7. The high-efficiency constant-current driving power supply device according to claim 6, wherein the self-locking circuit comprises an eighth resistor, a second diode, a first triode and a first power supply; a first end of the eighth resistor is connected with the first power supply, a second end of the eighth resistor is connected with a collector of the first triode, a base of the first triode is connected with an input end of the optocoupler feedback module, and an emitter of the first triode is grounded; and the anode of the second diode is connected with the collector of the first triode, and the cathode of the second diode is connected with the input end of the voltage comparison circuit.
8. The high-efficiency constant current driving power supply device according to claim 7, wherein the constant current driving power supply further comprises an analog dimming module, an output end of the analog dimming module is connected with an input end of the constant current control circuit, and an input end of the analog dimming module receives the dimming control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811590039.8A CN111436174A (en) | 2018-12-25 | 2018-12-25 | High-efficient constant current drive power supply equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811590039.8A CN111436174A (en) | 2018-12-25 | 2018-12-25 | High-efficient constant current drive power supply equipment |
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| CN111436174A true CN111436174A (en) | 2020-07-21 |
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| CN201811590039.8A Withdrawn CN111436174A (en) | 2018-12-25 | 2018-12-25 | High-efficient constant current drive power supply equipment |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112332365A (en) * | 2020-09-18 | 2021-02-05 | 深圳市海洋王照明工程有限公司 | Power supply high-voltage protection circuit and driving power supply |
| CN112423435A (en) * | 2020-11-13 | 2021-02-26 | 厦门强力巨彩光电科技有限公司 | LED drive circuit and LED display screen |
| CN113972731A (en) * | 2021-09-16 | 2022-01-25 | 厦门讯亨电子科技有限公司 | A charger current conversion circuit |
| CN113992002A (en) * | 2020-12-30 | 2022-01-28 | 深圳飞安瑞科技股份有限公司 | Constant current protection circuit, method, power supply and electronic equipment |
| CN114244080A (en) * | 2021-12-24 | 2022-03-25 | 芜湖国睿兆伏电子有限公司 | Pulse constant current control circuit |
| CN114340077A (en) * | 2021-11-16 | 2022-04-12 | 佛山电器照明股份有限公司 | LED dimming circuit, dimming LED lamp and LED dimming method based on LED dimming circuit |
| CN114423116A (en) * | 2022-03-29 | 2022-04-29 | 深圳市必易微电子股份有限公司 | Dimming control circuit, dimming control method and LED drive circuit |
| CN114745823A (en) * | 2022-04-16 | 2022-07-12 | 深圳市华浩德电子有限公司 | A feedback circuit for adaptive output voltage |
| WO2022213397A1 (en) * | 2021-04-09 | 2022-10-13 | 深圳市立创普电源技术有限公司 | Multi-output constant current control circuit and driving power supply |
| WO2023231108A1 (en) * | 2022-05-31 | 2023-12-07 | 广东奥普特科技股份有限公司 | Isolated feedback circuit for detecting output state of optocoupler |
| CN119472456A (en) * | 2025-01-07 | 2025-02-18 | 长沙拓欧科技有限公司 | Output control circuit, forklift walking control system, tracking method and device |
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2018
- 2018-12-25 CN CN201811590039.8A patent/CN111436174A/en not_active Withdrawn
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112332365A (en) * | 2020-09-18 | 2021-02-05 | 深圳市海洋王照明工程有限公司 | Power supply high-voltage protection circuit and driving power supply |
| CN112332365B (en) * | 2020-09-18 | 2023-10-10 | 深圳市海洋王照明工程有限公司 | Power supply high-voltage protection circuit and driving power supply |
| CN112423435A (en) * | 2020-11-13 | 2021-02-26 | 厦门强力巨彩光电科技有限公司 | LED drive circuit and LED display screen |
| CN113992002A (en) * | 2020-12-30 | 2022-01-28 | 深圳飞安瑞科技股份有限公司 | Constant current protection circuit, method, power supply and electronic equipment |
| WO2022213397A1 (en) * | 2021-04-09 | 2022-10-13 | 深圳市立创普电源技术有限公司 | Multi-output constant current control circuit and driving power supply |
| CN113972731A (en) * | 2021-09-16 | 2022-01-25 | 厦门讯亨电子科技有限公司 | A charger current conversion circuit |
| CN114340077A (en) * | 2021-11-16 | 2022-04-12 | 佛山电器照明股份有限公司 | LED dimming circuit, dimming LED lamp and LED dimming method based on LED dimming circuit |
| CN114244080A (en) * | 2021-12-24 | 2022-03-25 | 芜湖国睿兆伏电子有限公司 | Pulse constant current control circuit |
| CN114423116A (en) * | 2022-03-29 | 2022-04-29 | 深圳市必易微电子股份有限公司 | Dimming control circuit, dimming control method and LED drive circuit |
| CN114745823A (en) * | 2022-04-16 | 2022-07-12 | 深圳市华浩德电子有限公司 | A feedback circuit for adaptive output voltage |
| WO2023231108A1 (en) * | 2022-05-31 | 2023-12-07 | 广东奥普特科技股份有限公司 | Isolated feedback circuit for detecting output state of optocoupler |
| CN119472456A (en) * | 2025-01-07 | 2025-02-18 | 长沙拓欧科技有限公司 | Output control circuit, forklift walking control system, tracking method and device |
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Application publication date: 20200721 |