CN107197570B - Control circuit for adjusting light source brightness by detecting power switch action - Google Patents
Control circuit for adjusting light source brightness by detecting power switch action Download PDFInfo
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- CN107197570B CN107197570B CN201710617457.0A CN201710617457A CN107197570B CN 107197570 B CN107197570 B CN 107197570B CN 201710617457 A CN201710617457 A CN 201710617457A CN 107197570 B CN107197570 B CN 107197570B
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- power switch
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- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 4
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Classifications
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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]
- H05B45/10—Controlling the intensity of the light
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a control circuit for adjusting the brightness of a light source by detecting the action of a power switch, which relates to the technical field of LED dimming control and comprises an alternating current power supply, a rectifying circuit, an LED lamp string, a constant current driving circuit, a power switch action detection module and a timer module; the whole module converts an alternating current power supply into direct current to supply power for the LED lamp string and the constant current driving circuit; the constant current driving circuit is used for controlling the current of the LED lamp string; the timer module counts the turn-off time of the power switch and sends a control signal to the constant current driving circuit for setting the constant current driving circuit; the clock signal generation circuit converts the alternating-current power supply voltage signal into a clock signal with the same period, and transmits the clock signal to the timer module, and the timer module performs timing according to the clock signal. The clock of the power switch turn-off timer is directly determined by the alternating current frequency, so that the problem of inconsistent dimming current caused by inconsistent internal system clock when a plurality of lighting lamps are used in parallel can be avoided.
Description
Technical Field
The invention relates to the technical field of household dimming control, in particular to a control circuit for adjusting the brightness of a light source by detecting the action of a power switch.
Background
In the conventional circuit for detecting the operation of the power switch, as shown in fig. 1 or fig. 2, when the power switch is turned off, the input voltage of the power switch detecting unit is reduced to zero, and then the timer starts counting the turn-off time of the power switch. When the timer expires for a specified time Δtoff, the lighting drive device output current setting is changed, and when the power switch is turned on again, the lighting drive device output current is changed to another setting value. The specified time Δtoff is proportional to the internal oscillator clock period TOSC of the lighting driver, Δtoff=n×tosc, each lighting driver having its own independent oscillator clock.
When a power switch is used to control multiple lighting driving devices, if the clock periods TOSC of the respective oscillators of the multiple lighting driving devices are not consistent, it may happen that when the power switch state is switched, some lighting driving devices are full for a specified time Δtoff, the output current setting is changed, some lighting driving device output circuits are not full for the specified time Δtoff, and the output current setting is not changed. Resulting in inconsistent output currents of the multi-way lighting drive when the power switch is turned on again.
Disclosure of Invention
The invention solves the technical problem of the prior art, and provides a control circuit which uses an alternating current power supply oscillation signal as a clock source to time the turn-off time of a power switch and changes the output current of a lighting driving device according to the action of the power switch.
In order to solve the technical problems, the invention adopts the following technical scheme: a control circuit for adjusting the brightness of a light source by detecting the action of a power switch comprises an alternating current power supply, a rectifying circuit, an LED lamp string, a constant current driving circuit, a power switch action detection module and a timer module; the alternating current power supply module supplies power to the whole circuit system; the whole module converts an alternating current power supply into direct current to supply power for the LED lamp string and the constant current driving circuit; the constant current driving circuit is used for controlling the current of the LED lamp string; the power switch action detection module sends a trigger signal to the timer module to start timing after the power switch is opened, and sends a reset signal to the timer module to reset the timer after the power switch is closed; the timer module counts the turn-off time of the power switch and sends a control signal to the constant current driving circuit for setting the constant current driving circuit; the clock signal generation circuit converts the alternating-current power supply voltage signal into a clock signal with the same period, and transmits the clock signal to the timer module, and the timer module performs timing according to the clock signal.
Further, the clock signal generating circuit comprises a capacitor C7, a resistor R7 and a zener diode D4, wherein one end of the capacitor C7 is connected with a live wire of an alternating current power supply, the other end of the capacitor C7 is connected with R7 and a cathode of the zener diode, and an anode of the resistor R7 and an anode of the zener diode are grounded.
Further, the clock signal generating circuit comprises a resistor R8, a resistor R7 and a zener diode D4, wherein one end of the resistor R8 is connected with a live wire of an alternating current power supply, the other end of the resistor R8 is connected with the R7 and a cathode of the zener diode, and an anode of the resistor R7 and an anode of the zener diode are grounded.
Further, the power switch action detection module further comprises a diode D3, a resistor R5, a resistor R6 and a capacitor C5, wherein one end of the diode D3 is connected with a live wire of an alternating current power supply, the other end of the diode D is connected with the resistor R5, the other end of the resistor R5 is connected with the resistor R6 and the capacitor C5, the resistor R6 and the capacitor C5 are grounded, and the capacitor C5 is connected with the power switch action detection module.
Further, the output of the timer module controls the gating of the switches S1 to Sn to change the voltage value of VR; and the constant current driving circuit controls the current of the LED lamp string according to the voltage value of VR.
From the technical scheme, the invention has the following advantages: when the timer expires for a specified time Δtoff, the lighting drive device output current setting is changed, and when the power switch is turned on again, the lighting drive device output current is changed to another setting value. The specified time Δtoff is proportional to the alternating current oscillation period TAC, Δtoff=n×tac.
When one power switch is used for controlling the multi-path lighting driving device, the clock period of the timer of the multi-path lighting driving device is equal to the alternating current period TAC, so that the timing is not different, and the output current of the multi-path lighting driving device can be kept consistent after each power switch state is switched.
Drawings
FIG. 1 is a schematic diagram of a control circuit for detecting the operation of a power switch to adjust the brightness of a light source in the prior art;
FIG. 2 is a schematic diagram of a control circuit for detecting the operation of a power switch to adjust the brightness of a light source according to the prior art
FIG. 3 is a schematic circuit diagram of a first embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a second embodiment of the present invention.
Fig. 5 is a schematic diagram of a constant current driving circuit according to the present invention.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the drawings.
As shown in fig. 3, the control circuit for adjusting the brightness of the light source by detecting the action of the power switch mainly comprises an alternating current power supply, a rectifying circuit, an LED lamp string, a constant current driving circuit, a power switch action detection module, a timer module and a clock signal generating circuit. The alternating current power supply module supplies power to the whole circuit system, and 220V household electricity is adopted as alternating current in the embodiment.
The rectifying module converts an alternating current power supply into direct current to supply power to the LED lamp string and the constant current driving circuit, and the rectifying circuit is a rectifying bridge formed by four diodes.
The power switch action detection module sends a trigger signal to the timer module to start timing after the power switch is opened, and sends a reset signal to the timer module to reset the timer after the power switch is closed, the power switch action detection module mainly detects the power failure condition of the alternating current power supply, when the alternating current voltage at the input end is powered down to OV, the timer is started, the timer module counts the power switch off time, and the constant current drive circuit is switched according to the time set by the system, if the system is powered down for 200ms and less than 5 seconds, when the power switch is closed again, the input reference voltage of the constant current drive circuit is changed, the LED current is switched, so that dimming is carried out, and the like is repeated. If the system is powered down for more than 5 seconds, the timer module resets the input reference voltage of the constant current drive circuit to an initial state, namely a first gear. Of which 200ms,5 seconds are illustrative and not limiting herein.
The clock signal generating circuit converts the alternating-current power supply voltage signal into clock signals with the same period, and transmits the clock signals to the timer module, and the timer module performs timing according to the clock signals. One of the structures is as follows: the clock signal generating circuit comprises a capacitor C7, a resistor R7 and a voltage stabilizing diode D4, one end of the capacitor C7 is connected with a live wire of an alternating current power supply, the other end of the capacitor C7 is connected with R7 and a cathode of the voltage stabilizing diode, the resistor R7 and an anode of the voltage stabilizing diode are grounded, a voltage signal on the alternating current live wire is changed into a low-voltage clock CLK4 after being processed by the capacitor C7, the resistor R7 and the resistor D4, the period is an alternating current oscillation period, and the low-voltage clock CLK4 is used as a clock signal of a timer unit.
The capacitor C7 may be replaced by a resistor R8, which has the following specific structure: as shown in fig. 4, one end of the resistor R8 is connected to the live wire of the ac power supply, the other end is connected to R7 and the cathode of the zener diode, and the resistor R7 and the anode of the zener diode are grounded.
When the timer expires for a specified time Δtoff, its output signals K1-Kn change. The signals K1-Kn gate the switches S1-Sn, thereby changing the voltage value of the signal VR. As the voltage value of the signal VR changes, the lighting driver output current setting is changed, and when the power switch is turned on again, the lighting driver output current changes to another setting. The specified time Δtoff is proportional to the alternating current oscillation period TAC, Δtoff=n×tac.
When one power switch is used for controlling the multi-path lighting driving device, the clock period of the timer of the multi-path lighting driving device is equal to the alternating current period TAC, so that the timing is not different, and the output current of the multi-path lighting driving device can be kept consistent after each power switch state is switched.
The peripheral circuits of the power switch actuation detection module are as follows: the power supply switch action detection module comprises a diode D3, a resistor R5, a resistor R6 and a capacitor C5, wherein one end of the diode D3 is connected with a live wire of an alternating current power supply, the other end of the diode D is connected with the resistor R5, the other end of the R5 is connected with the resistor R6 and the capacitor C5, the resistor R6 and the capacitor C5 are grounded, and the capacitor C5 is connected with the power supply switch action detection module.
As shown in fig. 5, a schematic diagram of a constant current driving circuit is shown. The constant current driving circuit is used for controlling the current of the LED lamp string, and the signal VR is used as the reference input voltage of the constant current driving circuit. The constant current driving circuit mainly comprises a current sampling resistor Rcs, an amplifier and a high-power MOS tube, wherein the current sampling resistor Rcs is connected with the negative end of the amplifier, a signal VR is connected with the positive end of the amplifier, and the output end of the amplifier is connected with the grid electrode of the high-power MOS tube. The constant current driving circuit controls the gate voltage of the high-power MOS tube according to the voltage value of the input VR signal, so that the average voltage on the sampling resistor Rcs is equal to the signal VR. The prior art is mature and will not be described in detail herein.
Claims (5)
1. A control circuit for adjusting the brightness of a light source by detecting the action of a power switch comprises an alternating current power supply, a rectifying circuit, an LED lamp string, a reference voltage, a constant current driving circuit, a power switch action detection module and a timer module;
the alternating current power supply supplies power to the whole circuit system;
the rectification circuit converts an alternating current power supply into direct current to supply power for the LED lamp string and the constant current driving circuit;
the constant current driving circuit is used for controlling the current of the LED lamp string;
the power switch action detection module sends a trigger signal to the timer module to start timing after the power switch is opened, and sends a reset signal to the timer module to reset the timer after the power switch is closed;
the timer module counts the turn-off time of the power switch and sends a control signal to the constant current driving circuit for setting the constant current driving circuit;
the method is characterized in that: the clock signal generation circuit converts the alternating-current power supply voltage signal into a clock signal with the same period, and transmits the clock signal to the timer module, and the timer module performs timing according to the clock signal.
2. The control circuit for adjusting the brightness of a light source by detecting a power switch action according to claim 1, wherein: the clock signal generating circuit comprises a capacitor C7, a resistor R7 and a voltage stabilizing diode D4, wherein one end of the capacitor C7 is connected with a live wire of an alternating current power supply, the other end of the capacitor C7 is connected with R7 and a cathode of the voltage stabilizing diode, and the resistor R7 and an anode of the voltage stabilizing diode are grounded.
3. The control circuit for adjusting the brightness of a light source by detecting a power switch action according to claim 1, wherein: the clock signal generating circuit comprises a resistor R8, a resistor R7 and a zener diode D4, wherein one end of the resistor R8 is connected with a live wire of an alternating current power supply, the other end of the resistor R8 is connected with R7 and a cathode of the zener diode, and the positive electrodes of the resistor R7 and the zener diode are grounded.
4. The control circuit for adjusting the brightness of a light source by detecting a power switch action according to claim 1, wherein: the power switch action detection module is characterized by further comprising a diode D3, a resistor R5, a resistor R6 and a capacitor C5, wherein one end of the diode D3 is connected with a live wire of an alternating current power supply, the other end of the diode D3 is connected with the resistor R5, the other end of the R5 is connected with the resistor R6 and the capacitor C5, the resistor R6 and the capacitor C5 are grounded, and the capacitor C5 is connected with the power switch action detection module.
5. The control circuit for adjusting the brightness of a light source by detecting a power switch action according to claim 1, wherein: the output signal of the timer module controls the gating of the switches S1-Sn, and changes the voltage value of the input signal VR of the constant current drive circuit; the constant current driving circuit controls the current of the LED lamp string according to the voltage value of the signal VR, and different VR voltage values correspond to different LED lamp string current values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710617457.0A CN107197570B (en) | 2017-07-26 | 2017-07-26 | Control circuit for adjusting light source brightness by detecting power switch action |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710617457.0A CN107197570B (en) | 2017-07-26 | 2017-07-26 | Control circuit for adjusting light source brightness by detecting power switch action |
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| CN107197570A CN107197570A (en) | 2017-09-22 |
| CN107197570B true CN107197570B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710617457.0A Active CN107197570B (en) | 2017-07-26 | 2017-07-26 | Control circuit for adjusting light source brightness by detecting power switch action |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109890115B (en) * | 2019-04-19 | 2024-03-29 | 青岛易来智能科技股份有限公司 | Intelligent lamp control system and flashing control circuit thereof |
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| CN103687217A (en) * | 2013-11-29 | 2014-03-26 | 上海亚明照明有限公司 | Switching and dimming LED driving circuit |
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| CN203951654U (en) * | 2014-06-20 | 2014-11-19 | 陕西亚成微电子股份有限公司 | A kind of LED adjusting control circuit |
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| CN205961524U (en) * | 2016-08-15 | 2017-02-15 | 深圳市富满电子集团股份有限公司 | LED constant current drive chip, device and LED lamp |
| CN106804072A (en) * | 2017-01-18 | 2017-06-06 | 深圳创维－Rgb电子有限公司 | A kind of LED constant current drive system and its constant-current control circuit |
| CN206963154U (en) * | 2017-07-26 | 2018-02-02 | 无锡麟力科技有限公司 | By the control circuit for detecting power switch action regulation light-source brightness |
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2017
- 2017-07-26 CN CN201710617457.0A patent/CN107197570B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687217A (en) * | 2013-11-29 | 2014-03-26 | 上海亚明照明有限公司 | Switching and dimming LED driving circuit |
| CN103929854A (en) * | 2014-04-02 | 2014-07-16 | 深圳市明微电子股份有限公司 | LED drive device and LED dimming controller thereof |
| CN203951654U (en) * | 2014-06-20 | 2014-11-19 | 陕西亚成微电子股份有限公司 | A kind of LED adjusting control circuit |
| CN106132025A (en) * | 2016-08-15 | 2016-11-16 | 深圳市富满电子集团股份有限公司 | A kind of LED constant current driving chip, device and LED |
| CN205961524U (en) * | 2016-08-15 | 2017-02-15 | 深圳市富满电子集团股份有限公司 | LED constant current drive chip, device and LED lamp |
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| CN107197570A (en) | 2017-09-22 |
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Inventor after: Xia Hu Inventor after: Liu Guizhi Inventor after: Huang Nianya Inventor after: Wang Dongfeng Inventor before: Xia Hu |
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