CN117526726A - BUCK constant power control circuit with wide current and wide output voltage - Google Patents
BUCK constant power control circuit with wide current and wide output voltage Download PDFInfo
- Publication number
- CN117526726A CN117526726A CN202410015813.1A CN202410015813A CN117526726A CN 117526726 A CN117526726 A CN 117526726A CN 202410015813 A CN202410015813 A CN 202410015813A CN 117526726 A CN117526726 A CN 117526726A
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- resistor
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- triode
- grounded
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- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The BUCK constant power control circuit with wide current and wide output voltage comprises a main control unit U1, wherein the output end of the main control unit U1 is connected with the grid electrode of a MOS tube Q1, the source electrode of the MOS tube Q1 is grounded, and the drain electrode is connected with the input end through a diode D1; the photoelectric conversion circuit further comprises an optical coupler U3, the positive electrode of the light emitting end of the optical coupler U3 receives signals, the emitting electrode of the optical coupler U3 is grounded, the collecting electrode is connected with a voltage VCC through a resistor R13, the electrode is further connected with the base electrode of a triode Q3, the emitting electrode of the triode Q3 is grounded, the collecting electrode is connected with the voltage VCC through a resistor R11, the collecting electrode of the triode Q3 is further connected with the PWM transmitting end of the main control unit U1, the end is connected with the normal phase end of the operational amplifier unit U2 through a resistor R14, the reverse phase end of the operational amplifier unit U2 is connected with the output end of the operational amplifier unit U2, and the output end of the operational amplifier unit U2 is connected with a resistor R10 and an endpoint V1 at one time.
Description
Technical Field
The invention relates to the field of LED driving power supplies, in particular to a BUCK constant power control circuit with wide current and wide output voltage.
Background
The LED power supplies of a plurality of BUCK topologies can work at full power in a wide output current and a wide output voltage range, so that the output power of the LED power supplies can be 1.5-2 times of rated output power under the conditions of the maximum output current and the maximum output voltage, the lamp panel working power is excessively heated to damage lamp beads under the condition that the lamp panel is unpaired, and the LED power supplies can burn out the power supplies due to severe over-power.
Disclosure of Invention
In order to solve the problems, the technical scheme provides the constant-power control circuit for the BUCK with wide current and wide output voltage, and the invention can enable the maximum output power of the LED power supply with the BUCK topology with the wide output current and the BUCK with the wide output voltage which can be programmed by external current to always work under the constant-power condition, so that the LED lamp panel and the LED power supply cannot be burnt.
In order to achieve the above purpose, the technical scheme is as follows:
the BUCK constant power control circuit with wide current and wide output voltage comprises an input end, wherein the input end is connected with an output end through a first winding of a transformer T1;
the MOS transistor comprises a MOS transistor Q1, and is characterized by further comprising a main control unit U1, wherein the output end of the main control unit U1 is connected with the grid electrode of the MOS transistor Q1, the source electrode of the MOS transistor Q1 is grounded, and the drain electrode is connected with the input end through a diode D1;
the photoelectric conversion circuit comprises a main control unit U1, and is characterized by further comprising an optical coupler U3, wherein a light emitting end of the optical coupler U3 receives an external programming current signal, a positive electrode is grounded, an emitting electrode of the optical coupler U3 is grounded, a collecting electrode is connected with a voltage VCC through a resistor R13, the electrode is also connected with a base electrode of a triode Q3, the emitting electrode of the triode Q3 is grounded, the collecting electrode is connected with the voltage VCC through a resistor R11, the collecting electrode of the triode Q3 is also connected with a PWM transmitting end of the main control unit U1, the end is connected with a positive end of an operational amplifier unit U2 through a resistor R14, an inverting end of the operational amplifier unit U2 is connected with an output end of the operational amplifier unit U2, and the output end of the operational amplifier U2 is connected with a resistor R10 and an endpoint V1 at one time;
the intelligent transformer is characterized by further comprising a triode Q2, wherein a collector electrode of the triode Q2 is connected with the endpoint V1, an emitter electrode of the triode Q2 is connected with a sampling end of the main control unit U1, an emitter electrode of the triode Q is connected with a base electrode of the main control unit U1 through a diode D4, an input end of the triode Q is connected with a second winding of the transformer T1, the second winding is grounded once through a resistor R7 and a resistor R6, and the second winding is connected with the diode D4 through a resistor R8.
In some embodiments, the PWM output terminal of the master control unit U1 is connected to a resistor R9, and the resistor R9 is grounded through a capacitor C2 and a resistor R12, respectively.
In some embodiments, the resistor R14 is grounded through a capacitor C3.
In some embodiments, a resistor R5 is connected to the input terminal, the resistor R5 is grounded through a capacitor EC2, and the resistor R5 is further connected to the transformer T1 through a diode D3.
In some embodiments, a capacitor EC1 and a resistor R1 are respectively disposed between the positive electrode and the negative electrode of the output terminal.
The beneficial effects of the application are that:
by adopting the technical scheme, the external current programmable wide output current and wide output voltage BUCK topology LED power supply can well control the maximum output power with constant power, the BUCK LED power supply can not work under the conditions of the maximum output current and the maximum output voltage at the same time, so that the output power greatly exceeds the rated output power, and the LED lamp panel and the LED power supply can not be burnt out due to serious over-power.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a BUCK constant power control circuit with wide current and wide output voltage includes an input terminal connected to an output terminal through a first winding of a transformer T1;
the MOS transistor comprises a MOS transistor Q1, and is characterized by further comprising a main control unit U1, wherein the output end of the main control unit U1 is connected with the grid electrode of the MOS transistor Q1, the source electrode of the MOS transistor Q1 is grounded, and the drain electrode is connected with the input end through a diode D1;
the photoelectric conversion circuit comprises a main control unit U1, and is characterized by further comprising an optical coupler U3, wherein a light emitting end of the optical coupler U3 receives an external programming current signal, a positive electrode is grounded, an emitting electrode of the optical coupler U3 is grounded, a collecting electrode is connected with a voltage VCC through a resistor R13, the electrode is also connected with a base electrode of a triode Q3, the emitting electrode of the triode Q3 is grounded, the collecting electrode is connected with the voltage VCC through a resistor R11, the collecting electrode of the triode Q3 is also connected with a PWM transmitting end of the main control unit U1, the end is connected with a positive end of an operational amplifier unit U2 through a resistor R14, an inverting end of the operational amplifier unit U2 is connected with an output end of the operational amplifier unit U2, and the output end of the operational amplifier U2 is connected with a resistor R10 and an endpoint V1 at one time;
the intelligent transformer is characterized by further comprising a triode Q2, wherein a collector electrode of the triode Q2 is connected with the endpoint V1, an emitter electrode of the triode Q2 is connected with a sampling end of the main control unit U1, an emitter electrode of the triode Q is connected with a base electrode of the main control unit U1 through a diode D4, an input end of the triode Q is connected with a second winding of the transformer T1, the second winding is grounded once through a resistor R7 and a resistor R6, and the second winding is connected with the diode D4 through a resistor R8.
Further, the PWM output end of the master control unit U1 is connected to a resistor R9, and the resistor R9 is grounded through a capacitor C2 and a resistor R12, respectively.
Further, the resistor R14 is grounded through a capacitor C3.
Further, the input end is connected with a resistor R5, the resistor R5 is grounded through a capacitor EC2, and the resistor R5 is further connected with the transformer T1 through a diode D3.
Further, a capacitor EC1 and a resistor R1 are respectively arranged between the positive electrode and the negative electrode of the output end.
The working principle of the application is as follows:
the external current programming increases the positive duty ratio of MCU_PWM potential, through resistor R15, optocoupler U3 and resistor R11, resistor R13, triode Q3 is controlled and then input to main control unit U1, this unit is BUCK control chip, its positive duty ratio of 1 foot PWM port current dimming control also increases, U1 BUCK control chip is through electric group R4, MOS tube Q1, resistor R2 controls and makes LED+, LED-output port current also increase, simultaneously through resistor R9 in the circuit of the invention, capacitor C2, resistor R12, resistor R14, resistance-capacitance filter of capacitor C3 and voltage of 1 foot forward end of resistor divider input to operational amplifier unit U2 also increase, thus the voltage of 4 foot output end of operational amplifier unit U2 also increases, under the condition that triode Q2 is not conductive, the voltage of the invention at the potential of resistor R10 to V1 again increases, when the voltage at the V1 potential is just larger than 2V, the corresponding maximum output voltage and output current are just equal to rated output power, at the moment, if the positive duty ratio at the MCU_PWM potential is increased again, the voltage of 3 feet FB input into the main control unit U1 after the triode Q2 is conducted is also increased, because the output overvoltage protection point of 3 feet FB of the main control unit U1 is 2V, the partial voltage value of 3 feet FB of the resistor R6 to U1 is automatically reduced through the resistor R7, the resistor R8 and the triode Q2, namely the 3 feet FB partial voltage value of the resistor R6 to U1, namely the 3,4 feet winding of the transformer T1 controls the LED+ and the LED-output voltage outputted by BUCK freewheel, finally, the product of the current and the voltage of the LED+ and the LED-output port is kept constant, namely the LED+ and the maximum output power of the LED-output port is automatically controlled to be constant power output, the problem of output over-power does not occur.
The resistor R8 and the triode Q2 mainly play a role in controlling that the triode Q2 is conducted only when the potential of the 1 pin of the transformer T1 is larger than the potential of the 2 pin by at least more than 0.6V, so that the influence of the voltage of the 4 pin output end of the operational amplifier unit U2 is avoided when the 3 rd pin FB current zero crossing detection function of the U1 BUCK control chip, and the influence of other functions of the whole constant power control circuit is avoided.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application, but other principles and basic structures are the same or similar to the present application.
Claims (5)
1. The BUCK constant power control circuit with wide current and wide output voltage is characterized by comprising an input end, wherein the input end is connected with an output end through a first winding of a transformer T1;
the MOS transistor comprises a MOS transistor Q1, and is characterized by further comprising a main control unit U1, wherein the output end of the main control unit U1 is connected with the grid electrode of the MOS transistor Q1, the source electrode of the MOS transistor Q1 is grounded, and the drain electrode is connected with the input end through a diode D1;
the photoelectric conversion circuit comprises a main control unit U1, and is characterized by further comprising an optical coupler U3, wherein a light emitting end of the optical coupler U3 receives an external programming current signal, a positive electrode is grounded, an emitting electrode of the optical coupler U3 is grounded, a collecting electrode is connected with a voltage VCC through a resistor R13, the electrode is also connected with a base electrode of a triode Q3, the emitting electrode of the triode Q3 is grounded, the collecting electrode is connected with the voltage VCC through a resistor R11, the collecting electrode of the triode Q3 is also connected with a PWM transmitting end of the main control unit U1, the end is connected with a positive end of an operational amplifier unit U2 through a resistor R14, an inverting end of the operational amplifier unit U2 is connected with an output end of the operational amplifier unit U2, and the output end of the operational amplifier U2 is connected with a resistor R10 and an endpoint V1 at one time;
the intelligent transformer is characterized by further comprising a triode Q2, wherein a collector electrode of the triode Q2 is connected with the endpoint V1, an emitter electrode of the triode Q2 is connected with a sampling end of the main control unit U1, an emitter electrode of the triode Q is connected with a base electrode of the main control unit U1 through a diode D4, an input end of the triode Q is connected with a second winding of the transformer T1, the second winding is grounded once through a resistor R7 and a resistor R6, and the second winding is connected with the diode D4 through a resistor R8.
2. The wide current and wide output voltage BUCK constant power control circuit according to claim 1, wherein: the PWM output end of the main control unit U1 is connected with a resistor R9, and the resistor R9 is grounded through a capacitor C2 and a resistor R12 respectively.
3. The wide current and wide output voltage BUCK constant power control circuit according to claim 2, wherein: the resistor R14 is grounded through a capacitor C3.
4. The wide current and wide output voltage BUCK constant power control circuit according to claim 1, wherein: the input end is connected with a resistor R5, the resistor R5 is grounded through a capacitor EC2, and the resistor R5 is also connected with the transformer T1 through a diode D3.
5. The wide current and wide output voltage BUCK constant power control circuit according to claim 1, wherein: and a capacitor EC1 and a resistor R1 are respectively arranged between the positive electrode and the negative electrode of the output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410015813.1A CN117526726B (en) | 2024-01-05 | 2024-01-05 | BUCK constant power control circuit with wide current and wide output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410015813.1A CN117526726B (en) | 2024-01-05 | 2024-01-05 | BUCK constant power control circuit with wide current and wide output voltage |
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| Publication Number | Publication Date |
|---|---|
| CN117526726A true CN117526726A (en) | 2024-02-06 |
| CN117526726B CN117526726B (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4471418A (en) * | 1981-08-17 | 1984-09-11 | Compower Corporation | Switching power supply |
| WO2009124433A1 (en) * | 2008-04-08 | 2009-10-15 | 深圳和而泰智能控制股份有限公司 | A constant power limiter and light lamp |
| CN101765274A (en) * | 2010-01-29 | 2010-06-30 | 海洋王照明科技股份有限公司 | LED lamp and drive circuit |
| CN201674693U (en) * | 2010-04-29 | 2010-12-15 | 韦柳青 | Led driving power supply |
| CN203645881U (en) * | 2013-12-17 | 2014-06-11 | 苏州东山精密制造股份有限公司 | LED down lamp with wireless radio frequency remote control |
| US20140160809A1 (en) * | 2012-12-10 | 2014-06-12 | On-Bright Electronics (Shanghai)Co., Ltd. | Systems and methods for peak current adjustments in power conversion systems |
| CN103869857A (en) * | 2012-12-12 | 2014-06-18 | 深圳科士达科技股份有限公司 | Realization circuit and realization method of constant current and constant power |
| CN105979644A (en) * | 2016-06-17 | 2016-09-28 | 成都昂迪加科技有限公司 | White-light LED (Light-Emitting Diode) constant-current driving power supply based on pulse width modulation circuit |
| EP3576497A1 (en) * | 2018-05-31 | 2019-12-04 | Self Electronics Co., Ltd. | Constant voltage dimming power supply and dimming system for lighting device |
| CN115175405A (en) * | 2022-06-14 | 2022-10-11 | 浙江凯耀照明有限责任公司 | Control circuit for realizing constant power on primary side of switching power supply based on MCU control |
| CN115296528A (en) * | 2022-09-30 | 2022-11-04 | 广东东菱电源科技有限公司 | Circuit for improving wide input and output voltage LLC topological efficiency |
| CN218006560U (en) * | 2022-05-27 | 2022-12-09 | 浙江凯耀照明有限责任公司 | Wide-range constant power control circuit based on MCU software control |
| CN115622395A (en) * | 2022-09-08 | 2023-01-17 | 深圳市尚为照明有限公司 | Constant power output control circuit suitable for different LED lamps |
| CN218733887U (en) * | 2022-11-09 | 2023-03-24 | 无锡安特源科技股份有限公司 | BUCK ground overpower protection system |
-
2024
- 2024-01-05 CN CN202410015813.1A patent/CN117526726B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4471418A (en) * | 1981-08-17 | 1984-09-11 | Compower Corporation | Switching power supply |
| WO2009124433A1 (en) * | 2008-04-08 | 2009-10-15 | 深圳和而泰智能控制股份有限公司 | A constant power limiter and light lamp |
| CN101765274A (en) * | 2010-01-29 | 2010-06-30 | 海洋王照明科技股份有限公司 | LED lamp and drive circuit |
| CN201674693U (en) * | 2010-04-29 | 2010-12-15 | 韦柳青 | Led driving power supply |
| US20140160809A1 (en) * | 2012-12-10 | 2014-06-12 | On-Bright Electronics (Shanghai)Co., Ltd. | Systems and methods for peak current adjustments in power conversion systems |
| CN103869857A (en) * | 2012-12-12 | 2014-06-18 | 深圳科士达科技股份有限公司 | Realization circuit and realization method of constant current and constant power |
| CN203645881U (en) * | 2013-12-17 | 2014-06-11 | 苏州东山精密制造股份有限公司 | LED down lamp with wireless radio frequency remote control |
| CN105979644A (en) * | 2016-06-17 | 2016-09-28 | 成都昂迪加科技有限公司 | White-light LED (Light-Emitting Diode) constant-current driving power supply based on pulse width modulation circuit |
| EP3576497A1 (en) * | 2018-05-31 | 2019-12-04 | Self Electronics Co., Ltd. | Constant voltage dimming power supply and dimming system for lighting device |
| CN218006560U (en) * | 2022-05-27 | 2022-12-09 | 浙江凯耀照明有限责任公司 | Wide-range constant power control circuit based on MCU software control |
| CN115175405A (en) * | 2022-06-14 | 2022-10-11 | 浙江凯耀照明有限责任公司 | Control circuit for realizing constant power on primary side of switching power supply based on MCU control |
| CN115622395A (en) * | 2022-09-08 | 2023-01-17 | 深圳市尚为照明有限公司 | Constant power output control circuit suitable for different LED lamps |
| CN115296528A (en) * | 2022-09-30 | 2022-11-04 | 广东东菱电源科技有限公司 | Circuit for improving wide input and output voltage LLC topological efficiency |
| CN218733887U (en) * | 2022-11-09 | 2023-03-24 | 无锡安特源科技股份有限公司 | BUCK ground overpower protection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117526726B (en) | 2024-03-22 |
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