CN112770441A - Stroboscopic removing circuit and stroboscopic removing method - Google Patents
Stroboscopic removing circuit and stroboscopic removing method Download PDFInfo
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- CN112770441A CN112770441A CN202110001751.5A CN202110001751A CN112770441A CN 112770441 A CN112770441 A CN 112770441A CN 202110001751 A CN202110001751 A CN 202110001751A CN 112770441 A CN112770441 A CN 112770441A
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- 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]
- H05B45/30—Driver circuits
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- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The invention provides a stroboscopic removing circuit and a stroboscopic removing method, wherein an alternating current input is rectified to obtain an input voltage based on a front-stage power conversion circuit and a rear-stage power conversion circuit, and the front-stage power conversion circuit receives the input voltage and outputs a first current; the input end of the rear-stage power conversion circuit is connected with the output end of the front-stage power conversion circuit, and the output end of the rear-stage power conversion circuit is connected with the LED load to output a second current; and controlling the first current or the second current according to the output voltage of the preceding power conversion circuit or the difference value of the output voltage of the preceding power conversion circuit and the LED load voltage, so that the output power of the preceding power conversion circuit is matched with the output power of the rear power conversion circuit. The front-stage power conversion circuit and the rear-stage power conversion circuit can adopt the existing constant current driving technical scheme, and the scheme is complete.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a stroboscopic removing circuit and a stroboscopic removing method.
Background
In the existing technical scheme for removing stroboflash, one scheme is shown in fig. 1, an input signal drives an LED through a switching power supply with constant-current output, the voltage drop or current of the LED is fed back to the switching power supply to control the LED to remove stroboflash, the scheme outputs a low-voltage high-current signal, the output efficiency is low, and the heat treatment is troublesome.
Disclosure of Invention
The invention aims to provide a full-scheme stroboscopic removing circuit and a stroboscopic removing method, which are used for solving the problem of complex system scheme in the prior art.
A stroboscopic eliminating circuit for rectifying AC input to obtain input voltage comprises,
a preceding stage power conversion circuit receiving the input voltage and outputting a first current;
the input end of the rear-stage power conversion circuit is connected with the output end of the front-stage power conversion circuit, the output end of the rear-stage power conversion circuit is connected with the LED load, and the rear-stage power conversion circuit outputs a second current;
and controlling the first current or the second current according to the output voltage of the preceding power conversion circuit or the difference value of the output voltage of the preceding power conversion circuit and the LED load voltage, so that the output power of the preceding power conversion circuit is matched with the output power of the rear power conversion circuit.
Optionally, the switch circuit in the front-stage power conversion circuit is a buck-boost circuit, a buck circuit or a boost circuit, and the switch circuit in the rear-stage power conversion circuit is a buck circuit.
Optionally, the preceding stage power conversion circuit further includes a preceding stage control circuit, and the first reference voltage is obtained according to an output voltage of the preceding stage power conversion circuit or a difference between the output voltage of the preceding stage power conversion circuit and the LED load voltage; the first reference voltage controls a preceding stage power conversion circuit, and the first reference voltage represents an expected output current of the preceding stage power conversion circuit; the first reference voltage is smaller as the difference between the output voltage of the preceding power conversion circuit or the output voltage of the preceding power conversion circuit and the LED load voltage is larger.
Optionally, the rear-stage power conversion circuit further includes a rear-stage control circuit, and obtains a second reference voltage according to an output voltage of the front-stage power conversion circuit or a difference between the output voltage of the front-stage power conversion circuit and the LED load voltage; the second reference voltage controls the rear-stage power conversion circuit, and the second reference voltage represents the expected output current of the rear-stage power conversion circuit; the second reference voltage is larger as the difference between the output voltage of the preceding power conversion circuit or the output voltage of the preceding power conversion circuit and the LED load voltage is larger.
The invention also provides a stroboscopic removing method, which is based on the preceding stage power conversion circuit and the subsequent stage power conversion circuit, wherein the alternating current input is rectified to obtain an input voltage, and the preceding stage power conversion circuit receives the input voltage and outputs a first current; the input end of the rear-stage power conversion circuit is connected with the output end of the front-stage power conversion circuit, the output end of the rear-stage power conversion circuit is connected with the LED load, and the rear-stage power conversion circuit outputs a second current;
and controlling the first current or the second current according to the output voltage of the preceding power conversion circuit or the difference value of the output voltage of the preceding power conversion circuit and the LED load voltage, so that the output power of the preceding power conversion circuit is matched with the output power of the rear power conversion circuit.
Optionally, a first reference voltage is obtained according to an output voltage of the preceding power conversion circuit or a difference value between the output voltage of the preceding power conversion circuit and the LED load voltage; the first reference voltage controls a preceding power conversion circuit and represents the expected output current of the preceding power conversion circuit; the first reference voltage is smaller as the difference between the output voltage of the preceding power conversion circuit or the output voltage of the preceding power conversion circuit and the LED load voltage is larger.
Optionally, a second reference voltage is obtained according to an output voltage of the preceding power conversion circuit or a difference value between the output voltage of the preceding power conversion circuit and the LED load voltage; the second reference voltage controls the rear-stage power conversion circuit and represents the expected output current of the rear-stage power conversion circuit; the second reference voltage is larger as the difference between the output voltage of the preceding power conversion circuit or the output voltage of the preceding power conversion circuit and the LED load voltage is larger.
Optionally, the switch circuit in the front-stage power conversion circuit is a buck-boost circuit, a buck circuit or a boost circuit, and the switch circuit in the rear-stage power conversion circuit is a buck circuit.
Compared with the prior art, the invention has the following advantages: the front-stage power conversion circuit and the rear-stage power conversion circuit can adopt the existing control scheme, and the system is simple; the invention can realize the matching of the output power of the front stage power conversion circuit and the rear stage power conversion circuit.
Drawings
FIG. 1 is a block diagram of an embodiment of a conventional stroboscopic removal circuit;
FIG. 2 is a block diagram of an embodiment of a stroboscopic removal circuit of the present invention;
FIG. 3 is a schematic diagram of an embodiment of a stroboscopic removal circuit of the present invention;
FIG. 4 is a schematic diagram of a pre-stage control circuit according to an embodiment of the present invention;
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale for the purpose of facilitating and clearly explaining the embodiments of the present invention.
As shown in fig. 2, a block diagram of an embodiment of a stroboscopic removing circuit of the present invention is illustrated, which includes a rectification circuit, a front-stage power conversion circuit and a rear-stage power conversion circuit, an input voltage VIN is obtained from an ac input through the rectification circuit, the front-stage power conversion circuit receives the input voltage VIN, an output terminal of the front-stage power conversion circuit is connected to an input terminal of the rear-stage power conversion circuit, and the rear-stage power conversion circuit drives an LED load. And adjusting the output current of the front-stage power conversion circuit or the output current of the rear-stage power conversion circuit according to the output voltage Vo1 of the front-stage power conversion circuit or the difference value Vo1-VF between the output voltage of the front-stage power conversion circuit and the LED voltage drop so as to realize power balance between the front-stage power conversion circuit and the rear-stage power conversion circuit. When Vo1 or Vo1-VF controls a preceding power conversion circuit or a following power conversion circuit, and Vo1 or Vo1-VF controls the preceding power conversion circuit, the output current reference of the preceding power conversion circuit is obtained according to Vo1 or Vo1-VF, and the larger the Vo1 or Vo1-VF is, the smaller the reference is; when Vo1 or Vo1-VF controls the rear-stage power conversion circuit, the output current reference of the rear-stage power conversion circuit is obtained according to Vo1 or Vo1-VF, and the larger the Vo1 or Vo1-VF is, the larger the reference is.
As shown in fig. 3, a schematic diagram of an embodiment of a stroboscopic removing circuit of the present invention is shown, in which the front stage power conversion circuit is a buck-boost circuit, and the rear stage power conversion circuit is a buck circuit. The front stage control circuit controls a main power tube of the front stage power conversion circuit, and the rear stage control circuit controls a main power tube of the rear stage power conversion circuit. The former stage control circuit or the latter stage control circuit receives Vo1 or Vo1-VF to control the former stage power conversion circuit or the latter stage power conversion circuit.
As shown in fig. 4, a schematic diagram of an embodiment of a preceding stage control circuit of the present invention is illustrated, taking Vo1-VF control preceding stage power conversion circuit as an example, the preceding stage control circuit comprises a first control circuit U101, a comparator U102 and a driving circuit U103, wherein the first control circuit U101 receives Vo1-VF signals and outputs a preceding stage current reference VREF1, and the larger the Vo1-VF is, the smaller VREF1 is; the comparator U102 compares the inductor current sampling signal VCS of the previous stage power conversion circuit with VREF1, and drives the main power transistor of the previous stage power conversion circuit through the driving circuit U103. When Vo1-VF is adopted to control the rear-stage power conversion circuit, the control circuit schematic diagram is shown in figure 4.
Although the embodiments have been described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments not explicitly described, or to another embodiment described.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (8)
1. The utility model provides a remove stroboscopic circuit, alternating current input obtains input voltage after the rectification which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a preceding stage power conversion circuit receiving the input voltage and outputting a first current;
the input end of the rear-stage power conversion circuit is connected with the output end of the front-stage power conversion circuit, the output end of the rear-stage power conversion circuit is connected with the LED load, and the rear-stage power conversion circuit outputs a second current;
and controlling the first current or the second current according to the output voltage of the preceding power conversion circuit or the difference value of the output voltage of the preceding power conversion circuit and the LED load voltage, so that the output power of the preceding power conversion circuit is matched with the output power of the rear power conversion circuit.
2. The stroboscopic-removing circuit of claim 1, wherein: the switch circuit in the front-stage power conversion circuit is a buck-boost circuit, a buck circuit or a boost circuit, and the switch circuit in the rear-stage power conversion circuit is a buck circuit.
3. The stroboscopic-removing circuit of claim 1, wherein: the preceding stage power conversion circuit also comprises a preceding stage control circuit, and a first reference voltage is obtained according to the output voltage of the preceding stage power conversion circuit or the difference value between the output voltage of the preceding stage power conversion circuit and the LED load voltage; the first reference voltage controls a preceding stage power conversion circuit, and the first reference voltage represents an expected output current of the preceding stage power conversion circuit; the first reference voltage is smaller as the difference between the output voltage of the preceding power conversion circuit or the output voltage of the preceding power conversion circuit and the LED load voltage is larger.
4. The stroboscopic-removing circuit of claim 1, wherein: the rear-stage power conversion circuit also comprises a rear-stage control circuit, and a second reference voltage is obtained according to the output voltage of the front-stage power conversion circuit or the difference value between the output voltage of the front-stage power conversion circuit and the LED load voltage; the second reference voltage controls the rear-stage power conversion circuit, and the second reference voltage represents the expected output current of the rear-stage power conversion circuit; the second reference voltage is larger as the difference between the output voltage of the preceding power conversion circuit or the output voltage of the preceding power conversion circuit and the LED load voltage is larger.
5. A stroboscopic removing method is based on a preceding-stage power conversion circuit and a subsequent-stage power conversion circuit, alternating current input is rectified to obtain input voltage, and the stroboscopic removing method is characterized in that: the front-stage power conversion circuit receives input voltage and outputs first current; the input end of the rear-stage power conversion circuit is connected with the output end of the front-stage power conversion circuit, the output end of the rear-stage power conversion circuit is connected with the LED load, and the rear-stage power conversion circuit outputs a second current;
and controlling the first current or the second current according to the output voltage of the preceding power conversion circuit or the difference value of the output voltage of the preceding power conversion circuit and the LED load voltage, so that the output power of the preceding power conversion circuit is matched with the output power of the rear power conversion circuit.
6. The stroboscopic removal method according to claim 5, characterized in that: obtaining a first reference voltage according to the output voltage of the preceding power conversion circuit or the difference value between the output voltage of the preceding power conversion circuit and the LED load voltage; the first reference voltage controls a preceding power conversion circuit and represents the expected output current of the preceding power conversion circuit; the first reference voltage is smaller as the difference between the output voltage of the preceding power conversion circuit or the output voltage of the preceding power conversion circuit and the LED load voltage is larger.
7. The stroboscopic removal method according to claim 5, characterized in that: obtaining a second reference voltage according to the output voltage of the preceding power conversion circuit or the difference value between the output voltage of the preceding power conversion circuit and the LED load voltage; the second reference voltage controls the rear-stage power conversion circuit and represents the expected output current of the rear-stage power conversion circuit; the second reference voltage is larger as the difference between the output voltage of the preceding power conversion circuit or the output voltage of the preceding power conversion circuit and the LED load voltage is larger.
8. The stroboscopic removal method according to claim 5, characterized in that: the switching circuit in the preceding power conversion circuit is a buck-boost circuit, a buck circuit or a boost circuit, and the switching circuit in the subsequent power conversion circuit is a buck circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110001751.5A CN112770441A (en) | 2021-01-04 | 2021-01-04 | Stroboscopic removing circuit and stroboscopic removing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110001751.5A CN112770441A (en) | 2021-01-04 | 2021-01-04 | Stroboscopic removing circuit and stroboscopic removing method |
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| Publication Number | Publication Date |
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| CN112770441A true CN112770441A (en) | 2021-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110001751.5A Pending CN112770441A (en) | 2021-01-04 | 2021-01-04 | Stroboscopic removing circuit and stroboscopic removing method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695341A (en) * | 2012-05-28 | 2012-09-26 | 矽力杰半导体技术(杭州)有限公司 | LED drive power supply applicable to electronic transformer |
| CN102752940A (en) * | 2012-07-19 | 2012-10-24 | 矽力杰半导体技术(杭州)有限公司 | High-efficiency LED (light-emitting diode) drive circuit and drive method thereof |
| CN103260318A (en) * | 2013-05-30 | 2013-08-21 | 矽力杰半导体技术(杭州)有限公司 | LED drive circuit capable of adjusting light and light adjusting method thereof |
| US20160353535A1 (en) * | 2015-05-28 | 2016-12-01 | Philips Lighting Holding B.V. | Efficient lighting circuit for led assemblies |
| CN109104783A (en) * | 2017-06-21 | 2018-12-28 | 通用电气照明解决方案有限公司 | Driving circuit and LED light including driving circuit |
-
2021
- 2021-01-04 CN CN202110001751.5A patent/CN112770441A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695341A (en) * | 2012-05-28 | 2012-09-26 | 矽力杰半导体技术(杭州)有限公司 | LED drive power supply applicable to electronic transformer |
| CN102752940A (en) * | 2012-07-19 | 2012-10-24 | 矽力杰半导体技术(杭州)有限公司 | High-efficiency LED (light-emitting diode) drive circuit and drive method thereof |
| CN103260318A (en) * | 2013-05-30 | 2013-08-21 | 矽力杰半导体技术(杭州)有限公司 | LED drive circuit capable of adjusting light and light adjusting method thereof |
| US20160353535A1 (en) * | 2015-05-28 | 2016-12-01 | Philips Lighting Holding B.V. | Efficient lighting circuit for led assemblies |
| CN109104783A (en) * | 2017-06-21 | 2018-12-28 | 通用电气照明解决方案有限公司 | Driving circuit and LED light including driving circuit |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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