CN211152284U - Control circuit of lighting circuit and lighting circuit - Google Patents
Control circuit of lighting circuit and lighting circuit Download PDFInfo
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- CN211152284U CN211152284U CN201921504638.3U CN201921504638U CN211152284U CN 211152284 U CN211152284 U CN 211152284U CN 201921504638 U CN201921504638 U CN 201921504638U CN 211152284 U CN211152284 U CN 211152284U
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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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Abstract
The utility model discloses a lighting circuit's control circuit and lighting circuit, lighting circuit includes linear adjusting tube, lighting circuit's load is L ED lamp, obtains rectification voltage after the rectifier circuit rectification, linear adjusting tube and L ED lamp are established ties, rectification voltage is to L ED lamp power supply, works as rectification voltage more than or equal to first voltage, linear adjusting tube switches on, and control the electric current of L ED lamp is first current, switches on from L ED lamp and begins timing or begins timing for first current from L ED lamp current, reaches the first time when the timing, perhaps when rectification voltage more than or equal to second voltage, then control linear adjusting tube switches off, L ED lamp's electric current is zero, in next half power frequency cycle, works as rectification voltage more than or equal to first voltage, linear adjusting tube switches on once more.
Description
Technical Field
The utility model relates to a power electronic technology field, concretely relates to lighting circuit's control circuit and lighting circuit.
Background
With the development of L ED lamp beads and lighting technologies, a linear L ED lighting scheme is convenient for full-surface mounting technology production due to few electronic components and low cost, is easy to realize a light engine modularized lighting product, and simultaneously improves the production efficiency and reduces the labor cost, and the linear L ED lighting scheme is paid more and more attention and researched by more and more people.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present invention is to provide a control circuit of a lighting circuit and a lighting circuit, so as to solve the problem that the output current is affected by the input voltage in the prior art.
The technical solution of the utility model is to provide a lighting circuit's control method, lighting circuit includes linear adjusting tube, lighting circuit's load is L ED lamp, obtains rectification voltage after the input AC power source rectifier circuit rectification, linear adjusting tube and L ED lamp are established ties, rectification voltage is to L ED lamp power supply, works as rectification voltage more than or equal to first voltage, linear adjusting tube switches on, and control L ED lamp's electric current is first electric current, switches on from L ED lamp and begins timing or begins timing for first electric current from L ED lamp current, reaches the first time when timing, or works as rectification voltage more than or equal to second voltage, then control linear adjusting tube switches off, L ED lamp's electric current is zero, in next half power frequency cycle, works as rectification voltage more than or equal to first voltage, linear adjusting tube switches on again.
Optionally, the first voltage is a forward conduction voltage drop of L ED lamp, when the rectified voltage is greater than or equal to the first voltage, delaying a second time, the linear regulation tube is turned on, and starting timing from L ED lamp turn-on or starting timing from L ED lamp current for the first current, and when the timing reaches the first time, controlling the linear regulation tube to turn off.
Optionally, the first time decreases with an increase in a peak value or an effective value of the rectified voltage.
Optionally, when the rectified voltage is greater than or equal to the second voltage, the linear regulating tube is controlled to be turned off, and the first current decreases as a peak value or an effective value of the rectified voltage increases.
The utility model discloses a technical solution still provides a lighting circuit's control circuit, lighting circuit includes linear adjusting tube, lighting circuit's load is L ED lamp, obtains the rectified voltage after the alternating current input power source rectifier circuit rectification, linear adjusting tube and L ED lamp are established ties, the rectified voltage supplies power to L ED lamp, works as rectified voltage more than or equal to first voltage, control circuit control linear adjusting tube switches on, and control the electric current of L ED lamp is first current, switches on from L ED lamp and begins timing or begins timing for first current from L ED lamp current, reaches the first time when the timing, or works as rectified voltage more than or equal to second voltage, then control circuit control linear adjusting tube switches off, L ED lamp's electric current is zero, in next half power frequency cycle, works as rectified voltage more than or equal to first voltage, linear adjusting tube switches on again.
Optionally, the control circuit includes a voltage sampling circuit, a current sampling circuit, and a current control circuit, the voltage sampling circuit samples the rectified voltage to obtain a sampled voltage, the current sampling circuit samples the current of the L ED lamp to obtain a sampled current signal, when the sampled voltage indicates that the rectified voltage is greater than or equal to a first voltage, the current control circuit controls the linear adjustment tube to conduct, and controls the current of the L ED lamp to be the first current according to the sampled current signal, the current control circuit starts timing from L ED lamp conduction or timing from L ED lamp current to be the first current, when the timing reaches a first time, or when the rectified voltage is greater than or equal to a second voltage, the current control circuit controls the linear adjustment tube to turn off.
Optionally, the first voltage is a forward conduction voltage drop of L ED lamp, when the sampled voltage indicates that the rectified voltage is equal to or greater than the first voltage, the current control circuit delays for a second time to control the linear regulating tube to conduct, and starts timing from L ED lamp conduction or starts timing from L ED lamp current for the first current, and when the timing reaches the first time, the linear regulating tube is controlled to turn off.
Optionally, the first time decreases with an increase in a peak value or an effective value of the rectified voltage.
Optionally, when the rectified voltage is greater than or equal to the second voltage, the linear regulating tube is controlled to be turned off, and the first current decreases as a peak value or an effective value of the rectified voltage increases.
Another technical solution of the present invention is to provide a lighting circuit.
Adopt the utility model discloses a circuit structure and method, compared with the prior art, have following advantage: the output current is not influenced by the input voltage, and the output current or the power is ensured to be approximately constant.
Drawings
Fig. 1 is a block diagram of the lighting circuit and the control circuit thereof;
fig. 2 shows the rectified voltage and output current waveforms according to an embodiment of the present invention;
fig. 3 shows waveforms of rectified voltage and output current according to another embodiment of the present invention;
fig. 4 shows a rectified voltage and output current waveform according to another embodiment of the present invention;
fig. 5 is a block diagram of another embodiment of the lighting circuit and the control circuit thereof according to 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, and are only used for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.
The utility model provides a control method of lighting circuit, please refer to fig. 1, lighting circuit includes linear adjusting tube M01, lighting circuit's load is L ED lamp, and alternating current input power obtains rectified voltage VREC after rectifier circuit rectification, linear adjusting tube M01 and L ED lamp are established ties, rectified voltage VREC supplies power to L ED lamp, when rectified voltage VREC is more than or equal to first voltage, linear adjusting tube M01 switches on, and control the electric current of L ED lamp is first electric current, switches on from L ED lamp and begins timing or begins timing for first electric current from L ED lamp current, reaches the first time when the timing, or when rectified voltage is more than or equal to the second voltage, then control linear adjusting tube switches off, the electric current of L ED lamp is zero, in next half power frequency adjustment cycle, when rectified voltage is more than or equal to first voltage, linear tube switches on again.
Referring to fig. 2, for the rectified voltage and the output current waveform of the embodiment of the present invention, when the rectified voltage VREC is greater than or equal to the first voltage, the linear adjustment tube M01 is turned on, and the current of the L ED lamp is controlled to be the first current I1, and the timing is started from the turn-on of the L ED lamp or the timing is started from the L ED lamp current to be the first current I1, and when the timing reaches the first time, the linear adjustment tube is controlled to turn off, the current of the L ED lamp is zero, and in the next half power frequency cycle, when the rectified voltage is greater than or equal to the first voltage, the linear adjustment tube is turned on again.
Referring to fig. 3, in order to obtain the rectified voltage and output current waveform of the present invention, when the rectified voltage VREC is greater than or equal to the first voltage V1, the linear adjustment tube M01 is turned on, and the current of the L ED lamp is controlled to be the first current I1, when the rectified voltage is greater than or equal to the second voltage V2, the linear adjustment tube is turned off, the current of the L ED lamp is zero, and in the next half power frequency cycle, when the rectified voltage is greater than or equal to the first voltage V1, the linear adjustment tube is turned on again
Referring to fig. 4, in order to obtain the rectified voltage and output current waveform of the present invention, the first voltage is a forward conduction voltage drop V L ED of L ED lamp, when the rectified voltage VREC is greater than or equal to the first voltage, the second time is delayed, the linear adjusting tube is turned on, timing is started from the L ED lamp conduction or the L ED lamp current is started for the first current, when the timing reaches the first time, the linear adjusting tube is controlled to turn off, and after the linear adjusting tube is turned on, the current on the L ED lamp can reach the first current by delaying the second time.
When the first time is a fixed value, the output power does not change along with the change of the input voltage. However, when the input voltage is high, the efficiency of the system is lowered, and in some cases, the first time is controlled to decrease as the peak value or the effective value of the rectified voltage increases in order to make the input power constant.
When the first voltage is greater than the forward conduction voltage drop of L ED lamp, when the first voltage is less than the forward conduction voltage drop of L ED lamp, the output current can reach the first current.
In one embodiment, when the rectified voltage is greater than or equal to the second voltage, the linear regulating tube is controlled to be turned off, and the first current I1 decreases as the peak value or the effective value of the rectified voltage increases. Since the conversion efficiency is lower at a high input voltage than at a low input voltage, the effect of approximately inputting constant power is achieved by setting the first current to decrease as the peak value or the effective value of the rectified voltage increases.
Referring to fig. 5, the lighting circuit further includes a first diode D10 and a first capacitor C10, the rectified voltage is connected to the L ED lamp or the linear adjusting tube through the first diode D10, and the first capacitor C10 and the L ED lamp are connected in parallel, so as to reduce the current ripple of the L ED load and increase the average current of the output L ED.
The utility model provides a lighting circuit's control circuit, please refer to fig. 1, lighting circuit includes linear adjusting tube M01, lighting circuit's load is L ED lamp, and alternating current input power obtains rectified voltage VREC after rectifier circuit rectification, linear adjusting tube M01 and L ED lamp are established ties, the rectified voltage supplies power to L ED lamp, works as rectified voltage more than or equal to first voltage, control circuit control linear adjusting tube M01 switches on, and controls the electric current of L ED lamp is first electric current, starts timing or starts timing for first electric current from L ED lamp conduction or from L ED lamp current, reaches the first time when the timing, or works as rectified voltage more than or equal to second voltage, then control circuit control linear adjusting tube switches off, the electric current of L ED lamp is zero, in next half power frequency cycle, works as rectified voltage more than or equal to first voltage, linear adjusting tube switches on again.
With continued reference to fig. 1, in one embodiment, the control circuit includes a voltage sampling circuit 320, a current sampling circuit 330 and a current control circuit 310, the voltage sampling circuit 320 samples the rectified voltage VREC to obtain a sampled voltage V31, the current sampling circuit 330 samples the current of the L ED lamp to obtain a sampled current signal V32, the current control circuit controls the linear adjustment tube M01 to be turned on when the sampled voltage V31 indicates that the rectified voltage VREC is greater than or equal to a first voltage, and controls the current of the L ED lamp to be a first current according to a sampled current signal V32, the current control circuit starts to time from the L ED lamp being turned on or from the L ED lamp current being a first current, and controls the linear adjustment tube to be turned off when the time reaches the first time or when the rectified voltage is greater than or equal to a second voltage.
In one embodiment, the first voltage is a forward conduction voltage drop of L ED lamp, when the sampled voltage is indicative that the rectified voltage is equal to or greater than the first voltage, the current control circuit delays for a second time to control the linear regulating tube to conduct, and starts timing from L ED lamp conduction or starts timing for the first current from L ED lamp current, and when the timing reaches the first time, controls the linear regulating tube to turn off.
In one embodiment, the first time decreases as a peak value or an effective value of the rectified voltage increases.
In one embodiment, the first voltage is equal to or less than L ED forward conduction voltage drop.
In one embodiment, when the rectified voltage is greater than or equal to the second voltage, the linear regulating tube is controlled to be turned off, and the first current decreases as the peak value or the effective value of the rectified voltage increases.
Referring to fig. 5, the lighting circuit further includes a first diode D10 and a first capacitor C10, the rectified voltage is connected to the L ED lamp or the linear adjusting tube through the first diode D10, and the first capacitor C10 and the L ED lamp are connected in parallel, so as to reduce the current ripple of the L ED load and increase the average current of the output L ED.
The utility model also provides a lighting circuit.
In addition, although the embodiments are 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 without explicit mention.
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. A control circuit of a lighting circuit comprises a linear adjusting tube, wherein a load of the lighting circuit is a L ED lamp, an alternating current input power supply is rectified by a rectifying circuit to obtain a rectified voltage, the linear adjusting tube is connected with a L ED lamp in series, and the rectified voltage supplies power to a L ED lamp, and is characterized in that when the rectified voltage is larger than or equal to a first voltage, the control circuit controls the linear adjusting tube to be conducted, controls the current of the L ED lamp to be a first current, starts timing from L ED lamp conduction or starts timing from L ED lamp current to be the first current, when the timing reaches a first time, or when the rectified voltage is larger than or equal to a second voltage, the control circuit controls the linear adjusting tube to be turned off, the current of the L ED lamp is zero, and in the next half power frequency period, the linear adjusting tube is conducted again when the rectified voltage is larger than or equal to the first voltage.
2. The control circuit of claim 1, wherein the control circuit comprises a voltage sampling circuit, a current sampling circuit and a current control circuit, the voltage sampling circuit samples the rectified voltage to obtain a sampled voltage, the current sampling circuit samples the current of the L ED lamp to obtain a sampled current signal, the current control circuit controls the linear adjustment tube to conduct when the sampled voltage indicates that the rectified voltage is greater than or equal to a first voltage, and controls the current of the L ED lamp to be the first current according to the sampled current signal, the current control circuit starts timing from L ED lamp conduction or timing from L ED lamp current to the first current, and the current control circuit controls the linear adjustment tube to turn off when the timing reaches the first time or when the rectified voltage is greater than or equal to a second voltage.
3. The control circuit of claim 2, wherein the first voltage is a forward conduction voltage drop of L ED lamp, the current control circuit delays the first voltage when the sampled voltage indicates that the rectified voltage is greater than or equal to the first voltage, controls the linear regulating tube to conduct, and starts timing from L ED lamp conduction or from L ED lamp current for the first current, and controls the linear regulating tube to turn off when the timing reaches the first time.
4. The control circuit of the lighting circuit according to claim 2, wherein: the first time decreases as a peak value or an effective value of the rectified voltage increases.
5. The control circuit of the lighting circuit according to claim 2, wherein: when the rectified voltage is larger than or equal to the second voltage, the linear adjusting tube is controlled to be turned off, and the first current is reduced along with the increase of the peak value or the effective value of the rectified voltage.
6. A lighting circuit, characterized by: comprising a control circuit according to any of claims 1-5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019210513257 | 2019-07-08 | ||
| CN201921051325 | 2019-07-08 |
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| CN211152284U true CN211152284U (en) | 2020-07-31 |
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| CN201910856066.3A Pending CN110493926A (en) | 2019-07-08 | 2019-09-10 | A kind of control method of lighting circuit, control circuit and lighting circuit |
| CN201921504638.3U Active CN211152284U (en) | 2019-07-08 | 2019-09-10 | Control circuit of lighting circuit and lighting circuit |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910856066.3A Pending CN110493926A (en) | 2019-07-08 | 2019-09-10 | A kind of control method of lighting circuit, control circuit and lighting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493926A (en) * | 2019-07-08 | 2019-11-22 | 杰华特微电子（杭州）有限公司 | A kind of control method of lighting circuit, control circuit and lighting circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105979630B (en) * | 2016-06-08 | 2018-02-09 | 杰华特微电子（杭州）有限公司 | Led drive circuit |
| CN107911907B (en) * | 2017-12-11 | 2020-03-06 | 矽力杰半导体技术(杭州)有限公司 | LED drive circuit, power converter and control method |
| CN110493926A (en) * | 2019-07-08 | 2019-11-22 | 杰华特微电子（杭州）有限公司 | A kind of control method of lighting circuit, control circuit and lighting circuit |
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2019
- 2019-09-10 CN CN201910856066.3A patent/CN110493926A/en active Pending
- 2019-09-10 CN CN201921504638.3U patent/CN211152284U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493926A (en) * | 2019-07-08 | 2019-11-22 | 杰华特微电子（杭州）有限公司 | A kind of control method of lighting circuit, control circuit and lighting circuit |
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| CN110493926A (en) | 2019-11-22 |
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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. |