CN211297048U - Control circuit of lighting circuit - Google Patents
Control circuit of lighting circuit Download PDFInfo
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- CN211297048U CN211297048U CN201922316034.2U CN201922316034U CN211297048U CN 211297048 U CN211297048 U CN 211297048U CN 201922316034 U CN201922316034 U CN 201922316034U CN 211297048 U CN211297048 U CN 211297048U
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Abstract
The utility model provides a control circuit of lighting circuit, lighting circuit includes filter capacitor, rectifier circuit and LED, filter capacitor connects in parallel at the rectifier circuit output, LED connects filter capacitor, control circuit includes the detection circuitry that discharges, the detection circuitry that discharges connects filter capacitor, the detection circuitry that discharges detects whether the rectifier circuit input inserts alternating current power supply; 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 utility model discloses the electric shock problem that brings when can avoiding lighting circuit outage promotes lighting circuit security performance.
Description
Technical Field
The utility model relates to a power electronics field, in particular to lighting circuit's control 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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an avoid lighting circuit's of human electric shock control circuit when power outage for solve the problem that prior art exists when the power outage, lighting circuit causes the human electric shock.
In order to achieve the above object, the present invention provides a control circuit of an illumination circuit, the illumination circuit includes a filter capacitor, a rectifier circuit and a LED, the filter capacitor is connected in parallel to the output end of the rectifier circuit, the LED is connected to the filter capacitor, the control circuit includes a discharge detection circuit, the discharge detection circuit is connected to the filter capacitor, and the discharge detection circuit detects whether the input end of the rectifier circuit is connected to an ac power supply; 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.
Compared with the prior art, the utility model has the advantages of it is following: 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 utility model discloses the electric shock problem that brings when can avoiding lighting circuit outage promotes lighting circuit security performance.
Drawings
FIG. 1 is a schematic diagram of a prior art lighting circuit;
FIG. 2 is a schematic diagram of the lighting circuit and the control circuit thereof;
FIG. 3 is a schematic diagram of the discharge detection circuit of the present invention;
Detailed Description
The 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 present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present 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 simplified and in non-precise proportion, so as to facilitate and clearly assist in explaining the embodiments of the present invention.
As shown in fig. 2, the utility model discloses lighting circuit's control circuit schematic diagram, lighting circuit includes filter capacitor C0, rectifier circuit and LED load, filter capacitor C0 connects in parallel rectifier circuit U00 output, and LED connects 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, the schematic diagram of the discharge detection circuit of the present invention is illustrated, including the adjusting tube M00, the reference voltage generating circuit U101, the control circuit U102 and the sampling resistor R00, the first end of the adjusting tube M00 is connected to one end of the first resistor R1, and the second end thereof is connected to the 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 (6)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922316034.2U CN211297048U (en) | 2019-12-21 | 2019-12-21 | Control circuit of lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922316034.2U CN211297048U (en) | 2019-12-21 | 2019-12-21 | Control circuit of lighting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN211297048U true CN211297048U (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922316034.2U Active CN211297048U (en) | 2019-12-21 | 2019-12-21 | Control circuit of lighting circuit |
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| CN (1) | CN211297048U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110996444A (en) * | 2019-12-21 | 2020-04-10 | 杰华特微电子（杭州）有限公司 | Control circuit and control method of lighting circuit |
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2019
- 2019-12-21 CN CN201922316034.2U patent/CN211297048U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110996444A (en) * | 2019-12-21 | 2020-04-10 | 杰华特微电子（杭州）有限公司 | Control circuit and control method of lighting 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 Patentee 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 Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |