CN110996444A - Control circuit and control method of lighting circuit - Google Patents
Control circuit and control method of lighting circuit Download PDFInfo
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- CN110996444A CN110996444A CN201911331624.0A CN201911331624A CN110996444A CN 110996444 A CN110996444 A CN 110996444A CN 201911331624 A CN201911331624 A CN 201911331624A CN 110996444 A CN110996444 A CN 110996444A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a control circuit and a control method of an illumination circuit, wherein the illumination circuit comprises a filter capacitor, a rectifying circuit and an LED (light-emitting diode), the filter capacitor is connected in parallel with the output end of the rectifying circuit, the LED is connected with the filter capacitor, the control circuit comprises a discharge detection circuit, the discharge detection circuit is connected with the filter capacitor, and the discharge detection circuit detects whether the input end of the rectifying circuit is connected with an alternating current power supply or not; when the input end of the rectifying circuit is connected with an alternating current power supply, the discharge detection circuit is disconnected; when the input end of the rectifying circuit is not connected with an alternating current power supply, the discharge detection circuit is conducted, and the filter capacitor discharges through the discharge detection circuit. The invention can avoid the problem of electric shock caused by power failure of the lighting circuit and improve the safety performance of the lighting circuit.
Description
Technical Field
The present invention relates to the field of power electronics, and in particular, to a control circuit and a control method for an illumination circuit.
Background
Along with the popularization and application of LEDs, a large number of LED lamp strip products appear in the market, and most of the existing lamp strip products are composed of lamp beads and current-limiting resistors after a power grid passes through a rectifier bridge, so that the stroboscopic problem caused by power frequency ripples of the input power grid is generated.
In order to solve the problem, as shown in fig. 1, a large-capacity electrolytic capacitor C0 is added behind the rectifier bridge for filtering to solve the problem of stroboflash, but this also brings great safety hazard. On the one hand, because the large-capacity electrolytic capacitor C0 still stores a large amount of charges even if the input power grid is disconnected during use, an electric shock accident can occur if a person touches the power output part. The current-limiting resistor R0 is connected in parallel with two ends of the capacitor C0, although the capacitor C0 can discharge through the current-limiting resistor R0 when the power grid is disconnected, if the resistance of the resistor R0 is too small, the discharge time of the capacitor C0 is too long; if the resistance of the resistor R0 is too large, the resistor R0 consumes more energy and consumes too much energy when the power grid is accessed. On the other hand, in the use and installation process of the lamp strip lamp, as a power supply can be connected with a long lamp strip (the lamp strip generally takes each meter as a small unit), if a user is connected with the long lamp strip, overload can occur, or as the installation needs are possible to occur under the condition of electrification, the situation of cutting the long lamp strip short can occur, at this time, an output short circuit situation can occur, and the injury to personnel and the power supply can be easily caused.
Disclosure of Invention
The invention aims to provide a control circuit and a control method of an illumination circuit for avoiding human body electric shock when a power supply is powered off, which are used for solving the problem that the illumination circuit causes human body electric shock when the power supply is powered off in the prior art.
In order to achieve the purpose, the invention provides a control circuit of an illumination circuit, wherein the illumination circuit comprises a filter capacitor, a rectifying circuit and an LED, the filter capacitor is connected in parallel with the output end of the rectifying circuit, the LED is connected with the filter capacitor, the control circuit comprises a discharge detection circuit, the discharge detection circuit is connected with the filter capacitor, and the discharge detection circuit detects whether the input end of the rectifying circuit is connected with an alternating current power supply or not; when the input end of the rectifying circuit is connected with an alternating current power supply, the discharge detection circuit is disconnected; when the input end of the rectifying circuit is not connected with an alternating current power supply, the discharge detection circuit is conducted, and the filter capacitor discharges through the discharge detection circuit.
Optionally, the control circuit further includes a first resistor, and the first resistor is connected in series with the discharge detection circuit and then connected in parallel with the filter capacitor.
Optionally, the control circuit further includes an overload protection circuit, the overload protection circuit detects a current detection signal obtained by detecting a current flowing through the LED, and when the current detection signal is greater than a first threshold, the overload protection circuit controls the branch where the LED is located to be disconnected.
Optionally, the control circuit further includes a first resistor and a second resistor, the first resistor and the second resistor form a series circuit, one end of the series circuit is connected to one of the input ends of the rectifying circuit, and the other end of the series circuit is grounded; the voltage of a common connection end of the first resistor and the second resistor is sampling voltage, and when the time that the sampling voltage is continuously less than a second threshold value reaches first time, the input end of the rectification circuit is judged not to be connected with an alternating current power supply; otherwise, judging that the input end of the rectifying circuit is connected with an alternating current power supply.
Optionally, the control circuit further includes a first adjusting tube, a reference voltage generating circuit and a first control circuit, the first adjusting tube is connected in series with the first resistor, and an input end of the reference voltage generating circuit is connected to a common connection end of the first adjusting tube and the first resistor to output a reference voltage; the first control circuit receives the reference voltage, the sampling voltage and the first adjusting tube current sampling signal, and the output end of the first control circuit is connected with the control end of the first adjusting tube; when the input sampling voltage is larger than a second threshold value, the first control circuit controls the first adjusting tube to be turned off; and when the input sampling voltage is smaller than a second threshold value, the reference voltage and the first adjusting tube current sampling signal are subjected to error amplification and then the first adjusting tube current is adjusted.
Optionally, the overload protection circuit includes a second adjusting tube and a sampling resistor, the second adjusting tube, the sampling resistor and the LED are connected in series, and when the voltage across the sampling resistor is greater than the first threshold, the second adjusting tube is controlled to be turned off.
The invention also provides a control method of the lighting circuit, the lighting circuit comprises a filter capacitor and a rectifying circuit, the filter capacitor is connected in parallel with the output end of the rectifying circuit, the LED is connected with the filter capacitor, a discharge detection circuit is connected with the filter capacitor, and the discharge detection circuit detects whether the input end of the rectifying circuit is connected with an alternating current power supply or not; when the input end of the rectifying circuit is connected with an alternating current power supply, the discharge detection circuit is disconnected; when the input end of the rectifying circuit is not connected with an alternating current power supply, the discharge detection circuit is conducted, and the filter capacitor discharges through the discharge detection circuit.
Optionally, a current detection signal obtained by detecting a current flowing through the LED is detected, and when the current detection signal is greater than a first threshold, the overload protection circuit controls the branch where the LED is located to be disconnected.
Compared with the prior art, the invention has the following advantages: the discharge detection circuit is connected with the filter capacitor and detects whether the input end of the rectifying circuit is connected with an alternating current power supply or not; when the input end of the rectifying circuit is connected with an alternating current power supply, the discharge detection circuit is disconnected; when the input end of the rectifying circuit is not connected with an alternating current power supply, the discharge detection circuit is conducted, and the filter capacitor discharges through the discharge detection circuit. The invention can avoid the problem of electric shock caused by power failure of the lighting circuit and improve the safety performance of the lighting circuit.
Drawings
FIG. 1 is a schematic diagram of a prior art lighting circuit;
FIG. 2 is a schematic diagram of a lighting circuit and a control circuit thereof according to the present invention;
FIG. 3 is a schematic diagram of a discharge detection circuit 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 schematic diagram of a control circuit of the lighting circuit of the present invention is illustrated, the lighting circuit includes a filter capacitor C0, a rectifying circuit and an LED load, the filter capacitor C0 is connected in parallel to an output terminal of the rectifying circuit U00, and the LED is connected to the filter capacitor C0. The control circuit comprises a discharge detection circuit U01, a first resistor R1, a second resistor R2 and a third resistor R3, the discharge detection circuit U01 is connected with the first resistor R01 in series and then is connected with the filter capacitor in parallel to form C0, and the discharge detection circuit U01 detects whether the input end of the rectification circuit U00 is connected with an alternating current power supply or not. The second resistor R2 and the third resistor R3 form a series circuit, one end of the series circuit is connected with one input end of the rectifying circuit U00, and the other end of the series circuit is grounded; the voltage of a common connection terminal of the second resistor R2 and the third resistor R3 is a sampling voltage VCS1, and when the sampling voltage VCS1 is larger than a second threshold value, the input end of the rectifying circuit is judged to be connected with an alternating current power supply; otherwise, judging that the input end of the rectifying circuit is not connected with an alternating current power supply; when the input end of the rectifying circuit U00 is not connected with an alternating current power supply, the discharge detection circuit U01 is conducted, and the filter capacitor C0 discharges through the first resistor R1 and the discharge detection circuit U01.
The control circuit further comprises an overload protection circuit, the overload protection circuit comprises an adjusting tube M0, a sampling resistor RCS and a driving circuit U02, the adjusting tube M0, the sampling resistor RCS and an LED load are connected in series, the input end of the driving circuit U02 receives voltage VCS2 on the sampling resistor, the output end of the driving circuit U02 is connected with the control end of an adjusting tube M0, and RCS2 is an LED load current sampling signal. When the VCS2 is larger than the first threshold value, the LED load is short-circuited or overloaded, and the adjusting tube M0 is controlled to be disconnected.
As shown in fig. 2, a schematic diagram of the discharge detection circuit of the present invention is shown, which includes an adjusting tube M00, a reference voltage generating circuit U101, a control circuit U102 and a sampling resistor R00, wherein a first end of the adjusting tube M00 is connected to one end of a first resistor R1, and a second end thereof is connected to a resistor R00. The reference voltage generating circuit U101 is connected to the first end of the regulating tube M00, and outputs a reference voltage VREF. The control circuit U102 is connected with the common connection end of the second resistor R2 and the third resistor R3 and receives the reference voltage VREF and the voltage on the sampling resistor R00, and the output end of the control circuit U102 is connected with the control end of the adjusting tube M00. When the sampling voltage VCS1 is greater than a second threshold value, the control circuit U102 controls the adjusting tube M00 to be switched off; when the sampling voltage VCS1 is smaller than the second threshold, the transistor M00 is turned on, and the voltage on the reference voltage VREF and the resistor R00 controls the current on the transistor M00.
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 control circuit of lighting circuit, lighting circuit includes filter capacitor, rectifier circuit and LED, filter capacitor connects in parallel in the rectifier circuit output, LED connects filter capacitor, its characterized in that: the control circuit comprises a discharge detection circuit, the discharge detection circuit is connected with the filter capacitor, and the discharge detection circuit detects whether the input end of the rectification circuit is connected with an alternating current power supply or not; when the input end of the rectifying circuit is connected with an alternating current power supply, the discharge detection circuit is disconnected; when the input end of the rectifying circuit is not connected with an alternating current power supply, the discharge detection circuit is conducted, and the filter capacitor discharges through the discharge detection circuit.
2. The control circuit of the lighting circuit according to claim 1, wherein: the control circuit further comprises a first resistor, and the first resistor is connected with the discharge detection circuit in series and then connected with the filter capacitor in parallel.
3. A control circuit for a lighting circuit as claimed in claim 1 or 2, characterized in that: the control circuit further comprises an overload protection circuit, the overload protection circuit detects current flowing through the LED to obtain a current detection signal, and when the current detection signal is larger than a first threshold value, the overload protection circuit controls the branch where the LED is located to be disconnected.
4. The control circuit of the lighting circuit according to claim 3, wherein: the control circuit further comprises a first resistor and a second resistor, the first resistor and the second resistor form a series circuit, one section of the series circuit is connected with one input end of the rectifying circuit, and the other end of the series circuit is grounded; the voltage of a common connection end of the first resistor and the second resistor is sampling voltage, and when the time that the sampling voltage is continuously less than a second threshold value reaches first time, the input end of the rectification circuit is judged not to be connected with an alternating current power supply; otherwise, judging that the input end of the rectifying circuit is connected with an alternating current power supply.
5. The control circuit of the lighting circuit according to claim 4, wherein: the control circuit further comprises a first adjusting tube, a reference voltage generating circuit and a first control circuit, wherein the first adjusting tube is connected with a first resistor in series, and the input end of the reference voltage generating circuit is connected with the common connecting end of the first adjusting tube and the first resistor to output reference voltage; the first control circuit receives the reference voltage, the sampling voltage and the first adjusting tube current sampling signal, and the output end of the first control circuit is connected with the control end of the first adjusting tube; when the input sampling voltage is larger than a second threshold value, the first control circuit controls the first adjusting tube to be turned off; and when the input sampling voltage is smaller than a second threshold value, the reference voltage and the first adjusting tube current sampling signal are subjected to error amplification and then the first adjusting tube current is adjusted.
6. The control circuit of the lighting circuit according to claim 5, wherein: the overload protection circuit comprises a second adjusting tube and a sampling resistor, the second adjusting tube, the sampling resistor and the LED are connected in series, and when the voltage on the sampling resistor is larger than a first threshold value, the second adjusting tube is controlled to be turned off.
7. A control method of a lighting circuit, the lighting circuit comprises a filter capacitor and a rectifying circuit, the filter capacitor is connected in parallel with the output end of the rectifying circuit, and an LED is connected with the filter capacitor, and the control method is characterized in that: the discharge detection circuit is connected with the filter capacitor and detects whether the input end of the rectifying circuit is connected with an alternating current power supply or not; when the input end of the rectifying circuit is connected with an alternating current power supply, the discharge detection circuit is disconnected; when the input end of the rectifying circuit is not connected with an alternating current power supply, the discharge detection circuit is conducted, and the filter capacitor discharges through the discharge detection circuit.
8. The control method of the lighting circuit according to claim 7, wherein: and detecting the current flowing through the LED to obtain a current detection signal, and controlling the branch where the LED is positioned to be disconnected by the overload protection circuit when the current detection signal is greater than a first threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911331624.0A CN110996444A (en) | 2019-12-21 | 2019-12-21 | Control circuit and control method of lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911331624.0A CN110996444A (en) | 2019-12-21 | 2019-12-21 | Control circuit and control method of lighting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110996444A true CN110996444A (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911331624.0A Withdrawn CN110996444A (en) | 2019-12-21 | 2019-12-21 | Control circuit and control method of lighting circuit |
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| Country | Link |
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| CN (1) | CN110996444A (en) |
Citations (8)
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|---|---|---|---|---|
| CN102075098A (en) * | 2009-11-25 | 2011-05-25 | 台达电子工业股份有限公司 | Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof |
| CN102709871A (en) * | 2012-06-25 | 2012-10-03 | 英飞特电子（杭州）股份有限公司 | Impulse current inhibiting circuit and supply circuit |
| CN103269059A (en) * | 2013-05-21 | 2013-08-28 | 辉芒微电子（深圳）有限公司 | Switching circuit improving overvoltage protection precision |
| JP2015176666A (en) * | 2014-03-13 | 2015-10-05 | 三菱電機株式会社 | Lighting device and illuminating fixture |
| US20160105096A1 (en) * | 2014-10-13 | 2016-04-14 | Metal Industries Research & Development Centre | Power factor correction controller and power supply apparatus using the same |
| CN106793336A (en) * | 2017-01-20 | 2017-05-31 | 陕西亚成微电子股份有限公司 | A kind of LED drive circuit and its driving method |
| CN110461064A (en) * | 2019-08-19 | 2019-11-15 | 芯好半导体(成都)有限公司 | A kind of LED drive circuit, LED driving method and LED illumination device |
| CN211297048U (en) * | 2019-12-21 | 2020-08-18 | 杰华特微电子（杭州）有限公司 | Control circuit of lighting circuit |
-
2019
- 2019-12-21 CN CN201911331624.0A patent/CN110996444A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075098A (en) * | 2009-11-25 | 2011-05-25 | 台达电子工业股份有限公司 | Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof |
| CN102709871A (en) * | 2012-06-25 | 2012-10-03 | 英飞特电子（杭州）股份有限公司 | Impulse current inhibiting circuit and supply circuit |
| CN103269059A (en) * | 2013-05-21 | 2013-08-28 | 辉芒微电子（深圳）有限公司 | Switching circuit improving overvoltage protection precision |
| JP2015176666A (en) * | 2014-03-13 | 2015-10-05 | 三菱電機株式会社 | Lighting device and illuminating fixture |
| US20160105096A1 (en) * | 2014-10-13 | 2016-04-14 | Metal Industries Research & Development Centre | Power factor correction controller and power supply apparatus using the same |
| CN106793336A (en) * | 2017-01-20 | 2017-05-31 | 陕西亚成微电子股份有限公司 | A kind of LED drive circuit and its driving method |
| CN110461064A (en) * | 2019-08-19 | 2019-11-15 | 芯好半导体(成都)有限公司 | A kind of LED drive circuit, LED driving method and LED illumination device |
| CN211297048U (en) * | 2019-12-21 | 2020-08-18 | 杰华特微电子（杭州）有限公司 | Control circuit of lighting circuit |
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| PB01 | Publication | ||
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| CB02 | Change of applicant information | ||
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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 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200410 |