CN112543532B - Dimming control circuit and device thereof - Google Patents
Dimming control circuit and device thereof Download PDFInfo
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- CN112543532B CN112543532B CN202011477910.0A CN202011477910A CN112543532B CN 112543532 B CN112543532 B CN 112543532B CN 202011477910 A CN202011477910 A CN 202011477910A CN 112543532 B CN112543532 B CN 112543532B
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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
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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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
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
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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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- 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]
Abstract
The application discloses a dimming control circuit and a dimming control device. The dimming control circuit solves the problem that abnormal dimming control of the microcontroller to the LED lamp source sometimes occurs in the existing dimming control circuit through the newly added voltage stabilizing diode.
Description
Technical Field
The application relates to the technical field of LED control, in particular to a dimming control circuit and a dimming control device.
Background
In the field of dimming control, a PWM dimming method is generally used to change an output current, thereby adjusting the brightness of a light emitting unit. PWM dimming has the advantages of providing high quality white light, simple application, and high efficiency. For example, a pulse signal of arbitrary duty cycle may be generated using a dedicated PWM interface. Currently, most manufacturers' drivers support PWM dimming.
With the development of integrated circuit technology, more and more integrated dimming devices are presented. Dimming control of the LEDs is achieved, for example, by a Microcontroller (MCU).
However, in the existing dimming control circuit, abnormal dimming control of the LED lamp source by the microcontroller sometimes occurs.
In view of this, how to effectively solve the above problems has become an important research topic for related researchers and technicians.
Disclosure of Invention
The application aims to provide a dimming control circuit and a dimming control device. The dimming control circuit solves the problem that abnormal dimming control of the microcontroller to the LEDs sometimes occurs in the existing dimming control circuit through the newly added voltage stabilizing diode.
According to a first aspect of the present application, there is provided a dimming control circuit. The dimming control circuit includes: the rectification module is used for receiving alternating voltage and converting the alternating voltage into direct voltage; the sampling module is used for collecting the switching signals and outputting the collected switching signals; wherein the sampling module comprises: the pull-up resistor unit is connected with the pull-down resistor unit; the pull-up resistor unit comprises a pull-up resistor and a second zener diode, one end of the second zener diode is connected with one end of the pull-up resistor, the other end of the second zener diode is connected with one end of the pull-down resistor in the pull-down resistor unit, and the working voltage of the second zener diode is configured to preset reverse conducting voltage; the control module is connected with the sampling module and is used for detecting the switching signal and generating a PWM signal with corresponding duty ratio after logic judgment processing; and the driving module is respectively connected with the rectifying module and the control module and is used for controlling the current of an external load connected with the dimming control circuit based on the PWM signal of receiving the corresponding duty ratio.
Based on the technical scheme, the method can be further improved.
In at least some embodiments of the application, the dimming control circuit further comprises: the filtering module is connected with the rectifying module and used for filtering the rectified direct-current voltage; the first power supply module is connected with the filtering module and is used for leveling direct-current voltage; the transformation module is used for receiving the direct-current voltage and transforming the direct-current voltage to generate a first output voltage; and the second power supply module is connected with the transformation module and is used for receiving the first output voltage and supplying power to the control module.
In at least some embodiments of the application, the dimming control circuit further comprises: the PWM signal transmitting module is connected with the control module and used for transmitting PWM signals generated by the control module in a modulation mode; and the PWM signal receiving module is connected with the PWM signal transmitting module and is used for receiving the PWM signal and transmitting the PWM signal to the driving module.
In at least some embodiments of the present application, the pull-up resistor unit and the pull-down resistor unit are configured to divide an ac voltage to generate an output divided voltage, and provide the output divided voltage to the control module, wherein the output divided voltage is greater than a preset voltage.
In at least some embodiments of the present application, the sampling module further includes a first capacitor, one end of the first capacitor is connected to the first ac input terminal of the rectifying module, and the other end of the first capacitor is connected to the second ac input terminal of the rectifying module.
In at least some embodiments of the application, the first capacitance has a capacitance of 100NF to 330NF, preferably 220NF.
In at least some embodiments of the application, the first power module comprises: a fourth diode and a third electrolytic capacitor; the anode of the fourth diode is connected with the output end of the filtering module, the cathode of the fourth diode is connected with one end of the third electrolytic capacitor, the other end of the third electrolytic capacitor is grounded, and the fourth diode and the third electrolytic capacitor are used for controlling the input power factor of the driving module to be larger than a preset power factor.
In at least some embodiments of the application, the second power module comprises: a third diode and a second electrolytic capacitor; the anode of the third diode is connected with the input end of the second power supply module, the cathode of the third diode is connected with one end of the second electrolytic capacitor, and the third diode is used for isolating a tenth resistor connected with the output end of the voltage transformation module; the other end of the second electrolytic capacitor is grounded, and the second electrolytic capacitor is used for storing energy and supplying power to the control module within a preset time after the switch signal is closed.
In at least some embodiments of the application, the transformation module comprises: the first chip, the eighth capacitor and the tenth resistor; one end of the eighth capacitor is connected with the fifth pin of the first chip, the other end of the eighth capacitor is connected with the eighth pin of the first chip, and the eighth capacitor is used for storing energy and supplying power to the first chip; one end of the tenth resistor is connected with the output end of the voltage transformation module, the other end of the tenth resistor is grounded, and the tenth resistor is used for ensuring that the output voltage of the first chip is maintained when the output load of the first chip is empty.
In at least some embodiments of the application, the drive module comprises: the second chip, the first diode, the second diode, the eighth resistor, the second inductor, the first electrolytic capacitor and the fourth resistor; the anode of the first diode is connected with one end of the eighth resistor and the input end of the driving module, and the cathode of the first diode is respectively connected with the output end of the driving module, the cathode of the second diode, one end of the fourth resistor and one end of the first electrolytic capacitor; one end of the eighth resistor is connected with the input end of the driving module, and the other end of the eighth resistor is connected with a fourth pin of the second chip and is used for supplying power to the second chip; the anode of the second diode is respectively connected with a fifth pin of the second chip and one end of the second inductor; the second inductor is connected with the other end of the fourth resistor and the other end of the first electrolytic capacitor; the other end of the fourth resistor is connected with the other end of the first electrolytic capacitor.
According to a second aspect of the present application, there is provided a dimming control device. The dimming control device comprises the dimming control circuit provided by any embodiment of the application and an LED load connected with the dimming control circuit.
In at least some embodiments of the application, the dimming control means comprises a switch having neon bulb for generating the switching signal.
The dimming control circuit solves the problem that abnormal dimming control of the microcontroller to the LED sometimes occurs in the existing dimming control circuit through the newly-added isolation diode and the newly-added voltage stabilizing diode. In addition, the dimming control circuit further ensures the normal dimming control of the microcontroller on the LED by isolating the diode and combining a thin film capacitor (namely a first capacitor in the text) positioned in front of the input end of the rectifier bridge.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a block diagram of a dimming control circuit according to an embodiment of the present application.
Fig. 2 is a schematic circuit diagram of a dimming control circuit according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a dimming control device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; either directly or indirectly through intermediaries, may be in communication with each other or in interaction with each other. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the existing dimming control circuit, abnormal dimming control of the microcontroller to the LED sometimes occurs. The related art then finds that the reason for abnormal dimming control of the LED by the Microcontroller (MCU) is misjudgment operation due to interference of the detection pin of the microcontroller. Through further research and analysis, the real reason that the detection pin of the microcontroller is interfered is that the switch signal connected to the dimming control circuit can generate a leakage phenomenon after being turned off, especially the switch signal generated by the switch with neon bulb is easier to generate the leakage phenomenon, so the related technical proposal is proposed by the related technical personnel.
Fig. 1 is a dimming control circuit 100 and an apparatus thereof according to an embodiment of the application. Referring to fig. 1, in the embodiment of the present application, a dimming control circuit 100 is provided.
The dimming control circuit 100 includes at least: the rectification module 110 is configured to receive an ac voltage, rectify the ac voltage, and output a dc voltage; the filtering module 120 is connected with the rectifying module 110, and is used for receiving the rectified alternating voltage and filtering and outputting a relatively stable direct voltage; the first power supply module 130 is connected with the filtering module 120 and is used for stabilizing the direct current voltage after being flattened; the voltage transformation module 140 is connected to the first power supply module 130, and is configured to receive a stable dc voltage and transform the stable dc voltage to generate a first output voltage; the second power supply module 150 is connected to the transformation module 140, and is configured to receive the first output voltage and supply power to the control module; the sampling module 160 is configured to collect a switching signal and output the collected switching signal; wherein the sampling module 160 comprises: a pull-up resistance unit 161 and a pull-down resistance unit 162 connected to the pull-up resistance unit 161; the pull-up resistor unit 161 includes a pull-up resistor and a second zener diode, one end of the second zener diode is connected to one end of the pull-up resistor, the other end of the second zener diode is connected to one end of the pull-down resistor in the pull-down resistor unit 162, and an operating voltage of the second zener diode is configured to preset reverse conducting voltage; the control module 170 is respectively connected with the second power supply module 150 and the sampling module 160, and is used for detecting the switch signal and generating a PWM signal with a corresponding duty ratio after logic judgment processing; the driving module 180 is configured to control a current of an external load connected to the dimming control circuit 100 in an analog dimming manner based on receiving a PWM signal of a corresponding duty ratio and converting the PWM signal into an analog signal. The dimming control circuit 100 can solve the problem that the abnormal dimming control of the LED is sometimes caused by the interference of the detection pin of the microcontroller due to the drain voltage in the existing dimming control circuit.
Further, the sampling module 160 includes: and one end of the first capacitor C1 is connected with the first alternating current input end of the rectifying module 110, and the other end of the first capacitor C1 is connected with the second alternating current input end of the rectifying module 110. The capacitance value of the first capacitor C1 is 100NF to 330NF, preferably 220NF. Thus, not only the voltage stabilizing diode (i.e. the second voltage stabilizing diode ZD2 described above) can isolate the drain voltage generated by the switching signal collected by the sampling module when the ac voltage received by the rectifying module is low voltage input (about 85V to 132V), but also the voltage stabilizing diode is combined with the thin film capacitor (i.e. the first capacitor C1 described above) located before the input end of the rectifying bridge, so that the drain voltage generated by the switching signal when the ac voltage received by the rectifying module is high voltage input (175V to 264V) can be isolated.
In other words, the dimming control circuit 100 can solve the problem of the leakage voltage generated when the switch signal is turned off in the prior art through the combination design of the second zener diode and the first capacitor located before the input end of the rectifier bridge, so as to avoid the interference to the detection pin of the microcontroller and ensure the normal dimming control of the microcontroller to the LED.
Optionally, the dimming control circuit 100 may further include: a PWM signal transmitting module 190 and a PWM signal receiving module 1100.
Each module of the dimming control circuit 100 of the present application will be described in further detail with reference to the accompanying drawings.
The rectifying module 110 may include at least one rectifying bridge (MB 10S shown in fig. 2) for receiving an ac voltage, rectifying the ac voltage, and outputting a dc voltage. The ac voltage may be obtained by passing a live wire ACL and a neutral wire ACN through a fuse resistor FR1, and the rectifier bridge includes a first ac input terminal, a second ac input terminal, a first ac output terminal, and a second ac output terminal.
The filtering module 120 is connected to the rectifying module 110, and is configured to receive the rectified dc voltage, filter and output a relatively stable dc voltage, and reduce input differential mode interference noise. In this embodiment, the filtering module 120 may at least include: the first end of the first inductor L1 is respectively connected with the first alternating current output end of the rectifier bridge of the rectifier module 110 and the first end of the first resistor R1, and the second end of the first inductor L1 is respectively connected with the second end of the first resistor R1 and one end of the second capacitor C2; the first end of the first resistor R1 is connected with the first alternating current output end, and the second end of the first resistor R1 is connected with one end of the second capacitor C2; the other end of the second capacitor C2 is grounded. The second capacitor C2 is a thin film capacitor. Of course, in other embodiments, the filtering module 120 may also adopt one of LC filtering and CLC filtering.
The first power supply module 130 is connected to the filtering module 120 and the transforming module 140, respectively. The first power supply module 130 includes: a fourth diode D4 and a third electrolytic capacitor EC3; an anode of the fourth diode D4 is connected to the output end of the filtering module 120, and a cathode of the fourth diode D4 is connected to one end of the third electrolytic capacitor EC3, and the other end of the third electrolytic capacitor EC3 is grounded to PGND. The common junction of the fourth diode D4 and the third electrolytic capacitor EC3 is connected to the first input of the transformation module 140. The fourth diode D4 and the third electrolytic capacitor EC3 are used for controlling the power factor generated by the driving module 180 to be greater than a preset power factor. The capacitance value of the third electrolytic capacitor EC3 is much larger than the capacitance value of the second capacitor C2 in the filter module 120, so the third electrolytic capacitor EC3 can be charged through the fourth diode D4, and when the third electrolytic capacitor EC3 is discharged, the third electrolytic capacitor EC3 can only be discharged to the first chip of the voltage transformation module because the fourth diode D4 plays an isolating role on the third electrolytic capacitor EC 3. This ensures that the input power factor of the subsequent drive module 180 is a high power factor (i.e., a high PF).
The transforming module 140 is connected to the first power supply module 130, and is configured to receive a dc voltage and transform the dc voltage to generate a first output voltage. In this embodiment, the transforming module 140 may at least include: a first chip. The first chip may be a BP8501 type chip, but is not limited thereto. The BP8501 type chip is an ultra-low standby power consumption non-isolated buck constant voltage driving chip, can provide ultra-low standby power consumption, is smaller than 20mW, can output fixed 3.3V or 5V output voltage, and has good dynamic response. In addition, since the BP8501 chip has an over-temperature protection module, the entire circuit can be ensured to operate in a safe and reliable state. In addition, since the BP8501 chip has a dither circuit, harmonic interference energy can be dispersed, thereby improving EMI performance of the entire circuit.
Further, the transformation module 140 further includes a third inductor L3, an eighth capacitor C8, a fourth electrolytic capacitor EC4, and a tenth resistor R10. The first end of the third inductor L3 is connected to the fifth pin (i.e. the IC-GND) pin and the sixth pin (i.e. the SEL pin) of the first chip, and one end of the eighth capacitor C8, and the second end of the third inductor L3 is connected to the first pin (i.e. the VOUT pin) of the first chip, one end of the fourth electrolytic capacitor EC4, and the first end of the tenth resistor R10, respectively. One end of the eighth capacitor C8 is connected to the fifth pin and the sixth pin of the first chip, respectively, and the other end of the eighth capacitor C8 is connected to the eighth pin (i.e., VCC pin) of the first chip. One end of the fourth electrolytic capacitor EC4 is connected to the first pin of the first chip, and the other end of the fourth electrolytic capacitor EC4 is connected to the second pin (i.e., GND pin) of the first chip, the ground terminal, and the second terminal of the tenth resistor R10, respectively. The fourth pin (i.e., the DRAIN pin) of the first chip is connected to the first output terminal of the transformer module 140. The second terminal of the tenth resistor R10 is grounded PGND. The tenth resistor R10 is used as a dummy load resistor, and is used for maintaining the working stability of the whole voltage transformation module 140 in no-load, preventing the output voltage from being higher, and simultaneously ensuring that the output voltage of the first chip is maintained when the output load of the first chip is in a null state. The eighth capacitor C8 is used for storing energy and supplying power to the first chip. The fourth electrolytic capacitor EC4 is used for storing energy.
In addition, the VOUT pin of the first chip is used to monitor whether the output voltage of the second power supply module 150 is a preset voltage. The DRAIN pin of the first chip is used for connecting with the DRAIN electrode of the power tube inside the chip. The SEL pin of the first chip is used as a selection end of output voltage, and when the SEL pin is connected to the VCC pin, the output voltage is 3.3V; when connected to the IC-GND pin, the output voltage is 5V. And the DRAIN pin of the first chip is used as a power supply end of the chip.
The sampling module 160 is configured to collect the switching signal and output the collected switching signal. Wherein the sampling module 160 comprises: a pull-up resistor unit 161 and a pull-down resistor unit 162 connected to the pull-up resistor unit 161. The pull-up resistor unit 161 includes a pull-up resistor and a second zener diode, one end of the second zener diode is connected to one end of the pull-up resistor, the other end of the second zener diode is connected to one end of the pull-down resistor in the pull-down resistor unit 162, and the operating voltage of the second zener diode is configured to preset reverse conducting voltage. In this embodiment, the pull-up resistor unit 161 includes a pull-up resistor, specifically a fifth resistor R5 and a sixth resistor R6 connected in series, where a first end of the fifth resistor R5 is connected to the first ac input end of the rectifier bridge, a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6, a second end of the sixth resistor R6 is connected to a second zener diode, an anode of the second zener diode is connected to a first end of a seventh resistor R7 in the pull-down resistor unit 162, and a second end of the seventh resistor R7 is grounded PGND. It should be noted that, the pull-up resistor unit 161 and the pull-down resistor unit 162 are used for dividing the ac voltage to generate an output divided voltage, and providing the output divided voltage to the control module 170, where the output divided voltage is greater than a preset voltage.
In addition, the switch signal adoption module further comprises: a first zener diode ZD1 and a sixth capacitance C6. The cathode of the first zener diode ZD1 is connected to the first end of the seventh resistor R7, the anode of the second zener diode ZD2, and one end of the sixth capacitor C6, and the anode of the first zener diode ZD1 is connected to the second end of the seventh resistor R7, the other end of the sixth capacitor C6, and the ground terminal. One end of the sixth capacitor C6 is connected to the first end of the seventh resistor R7 and the anode of the second zener diode ZD2, and the other end of the sixth capacitor C6 is connected to the second end of the seventh resistor R7 and the ground terminal. The first zener diode ZD1 is used to protect the pin of the microcontroller of the control module 170, and the sixth capacitor C6 is used to filter and store energy, and keep the collected switching signal stably input to the control module 170. It should be noted that, if the second zener diode ZD2 is separately provided and the first capacitor C1 (i.e., the thin film capacitor) is not provided, only the drain voltage generated by the neon switch during the low voltage input can be isolated, but the drain voltage generated by the neon switch during the high voltage input cannot be effectively isolated.
With continued reference to fig. 1 and 2, a second power module 150 is coupled to the transformation module 140 for receiving the first output voltage (DC 5v+ as shown in fig. 2) and supplying power to the control module 170. The second power supply module 150 includes: a third diode D3 and a second electrolytic capacitor EC2. The anode of the third diode D3 is connected to the input end of the second power supply module 150, the cathode of the third diode D3 is connected to one end of the second electrolytic capacitor EC2, and the third diode D3 is configured to isolate a tenth resistor R10 connected to the output end of the voltage transformation module 140, so as to prevent the output voltage of the first chip stored in the second electrolytic capacitor EC2 from being consumed by the tenth resistor R10 when the switch is turned off.
The other end of the second electrolytic capacitor EC2 is grounded to PGND, and the second electrolytic capacitor EC2 is configured to store energy and supply power to the control module 170 within a preset time after the switch signal is turned off. The preset time is 3 seconds. Specifically, the control module 170 is supplied with power through the second electrolytic capacitor EC2 within 3 seconds after the switching signal is turned off. When 3 seconds are exceeded, a Microcontroller (MCU) in the control module 170 is automatically reset.
The control module 170 is respectively connected to the second power supply module 150 and the sampling module 160, and is configured to detect the switching signal, and generate a PWM signal with a corresponding duty ratio after logic judgment processing.
Wherein the control module 170 comprises a microcontroller MCU. The first pin of the microcontroller MCU is connected with the pin of the third diode D3 and one end of the second electrolytic capacitor EC2. And a second pin of the microcontroller MCU is connected with the cathode of the first zener diode ZD1, the first end of the seventh resistor R7 and one end of the sixth capacitor C6.
In this embodiment, the dimming control circuit 100 further includes: the PWM signal transmitting module 190 is connected to the control module 170, and is configured to transmit the PWM signal generated by the control module 170; the PWM signal receiving module 1100 is connected to the PWM signal transmitting module 190, and is configured to receive the PWM signal and transmit the PWM signal to the driving module 180.
Specifically, the PWM signal transmitting module 190 includes a second resistor R2, a first end of the second resistor R2 is connected to the fourth pin of the micro controller unit MCU, and a second end of the second resistor R2 is grounded to PGND.
The PWM signal receiving module 1100 includes a third resistor R3 and a third capacitor C3. The first end of the third resistor R3 is connected to one end of the third capacitor C3 and a first pin of a second chip in the driving module 180 described below, and the second end of the third resistor R3 is grounded to PGND. One end of the third capacitor C3 is connected to the first pin of the second chip, and the other end of the third capacitor C3 is grounded to PGND. Wherein the second resistor R2, the third resistor R3 and the third capacitor C3 are used together for matched filtering.
The driving module 180 is connected to the second power supply module 150 and the control module 170, and is configured to control a current of an external load connected to the dimming control circuit 100 in an analog dimming manner based on receiving a PWM signal of a corresponding duty ratio and converting the PWM signal into an analog signal.
Specifically, the driving module 180 includes: the second chip, the first diode D1, the second diode D2, the eighth resistor R8, the second inductor L2, the first electrolytic capacitor EC1, the fourth resistor R4 and the common-mode capacitor CY1; wherein the anode of the first diode D1 is connected to one end of the eighth resistor R8 and the input end of the driving module 180, and the cathode of the first diode D1 is connected to the output end of the driving module 180, the cathode of the second diode D2, one end of the fourth resistor R4 and one end of the first electrolytic capacitor EC1, respectively; one end of the eighth resistor R8 is connected to the input end of the driving module 180, and the other end of the eighth resistor R8 is connected to the fourth pin of the second chip, so as to supply power to the second chip; the anode of the second diode D2 is respectively connected with a fifth pin of the second chip and one end of the second inductor L2; the second inductor L2 is connected with the other end of the fourth resistor R4 and the other end of the first electrolytic capacitor EC 1; the other end of the fourth resistor R4 is connected with the other end of the first electrolytic capacitor EC 1.
The second chip adopts a BP2306 type chip, and a first pin (namely a DIM pin) of the second chip is connected with a third resistor R3 and a third capacitor C3. A second pin (i.e., a ROVP pin) of the second chip is connected to a twentieth resistor. A fourth pin (i.e., HV pin) of the second chip is connected to an eighth resistor R8. A fifth pin (DRAIN pin) of the second chip is connected to the anode of the second diode D2 and the first end of the second inductor L2. The seventh pin (i.e., CS pin) of the second chip is connected to one end of the selection resistor. The eighth pin (i.e., GND pin) of the second chip is grounded. Further, the first end of the second inductor L2 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the cathode of the first diode D1 and the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is connected to the second end of the second inductor L2. One end of the first electrolytic capacitor EC1 is connected with the cathode of the first diode D1, the cathode of the second diode D2 and one end of the fourth resistor R4, and the other end of the first electrolytic capacitor EC1 is connected with the second end of the second inductor L2 and the second end of the fourth resistor R4. One end of the common-mode capacitor CY1 is connected with the second end of the second inductor L2, the second end of the fourth resistor R4 and the other end of the first electrolytic capacitor EC1, and the other end of the common-mode capacitor CY1 is respectively connected with the other end of the selection resistor and the grounding end.
It should be noted that the BP2306 type chip is a high PF BUCK LED constant current control chip compatible with PWM/analog dimming, and is suitable for 90Vac-265Vac full range input voltage. The chip is started by high voltage, and a COMP compensation capacitor is built in the chip, so that the cost is reduced. The chip can realize excellent linear adjustment rate and load adjustment rate. In addition, the chip provides various protection functions, including LED load short-circuit protection, LED open-circuit protection and temperature regulation, and enhances the reliability of the circuit.
In addition, an eighth resistor R8 is used to supply power to the second chip. The first diode D1 is used to prevent the stored electric energy of the first electrolytic capacitor EC1 from flowing backward. The second diode D2 is used for freewheeling action on the second inductor L2, so that the circuit operates stably and maintains stable output. The fourth resistor R4 is used as a dummy load resistor, and is used for maintaining the operation stability of the whole driving module 180 when no load exists, and simultaneously ensuring that the no-load voltage of the second chip is maintained when the output load of the second chip is empty. The first electrolytic capacitor EC1 is used for filtering. The common mode capacitor CY1 is used for eliminating interference of the common mode signal. The twentieth resistor R20 is used to control the no-load voltage when the second chip is in no-load.
The dimming control circuit 100 solves the problem of leakage generated when the switch with neon bulb is turned off in the prior art by adding the isolation diode and the thin film capacitor positioned in front of the input end of the rectifier bridge, namely effectively isolates the leakage voltage, thereby avoiding the interference to the detection pin of the microcontroller MCU and ensuring the normal dimming control of the microcontroller MCU to the LED.
Referring to fig. 3, in an embodiment of the present application, a dimming control device 1000 is provided. The dimming control device 1000 includes a dimming control circuit 100 according to any one of the embodiments of the present application, and an LED load 200 connected to the dimming control circuit 100. The specific circuit structure of the dimming control circuit 100 is as described above, and will not be described herein.
The dimming control device further comprises a switch 300 having neon bulb, and the switch 300 is used for generating a switching signal.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description has been made in detail on a dimming control circuit 100 and a device 1000 thereof provided by the embodiments of the present application, and specific examples are applied herein to illustrate the principles and implementations of the present application, and the above description of the embodiments is only for helping to understand the technical solution and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (11)
1. A dimming control circuit, comprising:
the rectification module is used for receiving alternating voltage and converting the alternating voltage into direct voltage;
the sampling module is used for collecting the switching signals and outputting the collected switching signals; wherein the sampling module comprises: the pull-up resistor unit is connected with the pull-down resistor unit; the pull-up resistor unit comprises a pull-up resistor and a second zener diode, one end of the second zener diode is connected with one end of the pull-up resistor, the other end of the second zener diode is connected with one end of the pull-down resistor in the pull-down resistor unit, and the working voltage of the second zener diode is configured to preset reverse conducting voltage;
the control module is connected with the sampling module and is used for detecting the switching signal and generating a PWM signal with corresponding duty ratio after logic judgment processing;
the driving module is respectively connected with the rectifying module and the control module and is used for controlling the current of an external load connected with the dimming control circuit based on receiving PWM signals with corresponding duty ratios;
the pull-up resistor unit and the pull-down resistor unit are used for dividing alternating voltage to generate output divided voltage and provide the output divided voltage to the control module;
the sampling module further comprises: the cathode of the first zener diode is connected with one end of a pull-down resistor in the pull-down resistor unit, and the anode of the first zener diode is connected with the other end of the pull-down resistor in the pull-down resistor unit and the grounding end;
the sampling module further comprises a first capacitor, the capacitance value of the first capacitor is 100NF to 330NF, one end of the first capacitor is connected with the first alternating current input end of the rectifying module, and the other end of the first capacitor is connected with the second alternating current input end of the rectifying module.
2. The dimming control circuit of claim 1, wherein the dimming control circuit further comprises:
the filtering module is connected with the rectifying module and used for filtering the rectified direct-current voltage;
the first power supply module is connected with the filtering module and is used for leveling direct-current voltage;
the transformation module is used for receiving the direct-current voltage and transforming the direct-current voltage to generate a first output voltage;
and the second power supply module is connected with the transformation module and is used for receiving the first output voltage and supplying power to the control module.
3. The dimming control circuit of claim 1, wherein the dimming control circuit further comprises:
the PWM signal transmitting module is connected with the control module and used for transmitting PWM signals generated by the control module in a modulation mode;
and the PWM signal receiving module is connected with the PWM signal transmitting module and is used for receiving the PWM signal and transmitting the PWM signal to the driving module.
4. The dimming control circuit of claim 1, wherein the output divided voltage is greater than a preset voltage.
5. The dimming control circuit of claim 1, wherein the capacitance of the first capacitor is 220NF.
6. The dimming control circuit of claim 2, wherein the first power module comprises: a fourth diode and a third electrolytic capacitor; the anode of the fourth diode is connected with the output end of the filtering module, the cathode of the fourth diode is connected with one end of the third electrolytic capacitor, the other end of the third electrolytic capacitor is grounded, and the fourth diode and the third electrolytic capacitor are used for controlling the input power factor of the driving module to be larger than a preset power factor.
7. The dimming control circuit of claim 2, wherein the second power supply module comprises: a third diode and a second electrolytic capacitor; the anode of the third diode is connected with the input end of the second power supply module, the cathode of the third diode is connected with one end of the second electrolytic capacitor, and the third diode is used for isolating a tenth resistor connected with the output end of the voltage transformation module; the other end of the second electrolytic capacitor is grounded, and the second electrolytic capacitor is used for storing energy and supplying power to the control module within a preset time after the switch signal is closed.
8. The dimming control circuit of claim 2, wherein the voltage transformation module comprises: the first chip, the eighth capacitor and the tenth resistor; one end of the eighth capacitor is connected with the fifth pin of the first chip, the other end of the eighth capacitor is connected with the eighth pin of the first chip, and the eighth capacitor is used for storing energy and supplying power to the first chip; one end of the tenth resistor is connected with the output end of the voltage transformation module, the other end of the tenth resistor is grounded, and the tenth resistor is used for ensuring that the output voltage of the first chip is maintained when the output load of the first chip is empty.
9. The dimming control circuit of claim 1, wherein the drive module comprises: the second chip, the first diode, the second diode, the eighth resistor, the second inductor, the first electrolytic capacitor and the fourth resistor; the anode of the first diode is connected with one end of the eighth resistor and the input end of the driving module, and the cathode of the first diode is respectively connected with the output end of the driving module, the cathode of the second diode, one end of the fourth resistor and one end of the first electrolytic capacitor; one end of the eighth resistor is connected with the input end of the driving module, and the other end of the eighth resistor is connected with a fourth pin of the second chip and is used for supplying power to the second chip; the anode of the second diode is respectively connected with a fifth pin of the second chip and one end of the second inductor; the second inductor is connected with the other end of the fourth resistor and the other end of the first electrolytic capacitor; the other end of the fourth resistor is connected with the other end of the first electrolytic capacitor.
10. A dimming control device comprising a dimming control circuit according to any one of claims 1 to 9 and an LED load connected to the dimming control circuit.
11. The dimming control device of claim 10, wherein the dimming control device comprises a switch having neon bulb, the switch for generating the switching signal.
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| CN202011477910.0A CN112543532B (en) | 2020-12-15 | 2020-12-15 | Dimming control circuit and device thereof |
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| CN202011477910.0A CN112543532B (en) | 2020-12-15 | 2020-12-15 | Dimming control circuit and device thereof |
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5414611A (en) * | 1992-10-12 | 1995-05-09 | Nec Corporation | Single transformer switching regulator |
| CN201700061U (en) * | 2010-06-11 | 2011-01-05 | 卢国泰 | High-power factor LED power driver |
| CN203117259U (en) * | 2013-01-21 | 2013-08-07 | 中国人民解放军63963部队 | Direct current leakage detection circuit |
| CN103841731A (en) * | 2014-03-21 | 2014-06-04 | 深圳天源中芯半导体有限公司 | Switch piecewise dimming circuit used for LED drive |
| CN103904878A (en) * | 2014-01-09 | 2014-07-02 | 常州隆辉照明科技有限公司 | Efficient power factor compensating circuit without switch |
| CN203708101U (en) * | 2014-01-09 | 2014-07-09 | 常州隆辉照明科技有限公司 | Switch-free high-power factor compensation circuit |
| CN104661408A (en) * | 2015-02-10 | 2015-05-27 | 深圳市佳比泰电子科技有限公司 | LED dimming circuit and LED lamp |
| CN104853476A (en) * | 2015-02-10 | 2015-08-19 | 深圳市佳比泰电子科技有限公司 | LED dimming circuit and LED lamp |
| CN105792416A (en) * | 2016-03-16 | 2016-07-20 | 浙江双宇电子科技有限公司 | Control circuit of switch light-dimming type LED lamp |
| CN206136369U (en) * | 2016-03-16 | 2017-04-26 | 浙江双宇电子科技有限公司 | Switch light modulation control circuit |
| CN206533573U (en) * | 2016-12-19 | 2017-09-29 | 深圳市崧盛电子股份有限公司 | A kind of power supply adjusting control circuit and power supply |
| CN206775383U (en) * | 2017-04-28 | 2017-12-19 | 深圳市源尤电源科技有限公司 | A kind of power circuit with fictitious load |
| CN207053839U (en) * | 2017-06-15 | 2018-02-27 | 佛山电器照明股份有限公司 | A kind of phase-cut dimming LED circuit with small night lamp function |
| CN207410557U (en) * | 2017-09-29 | 2018-05-25 | 上海瀚唯科技有限公司 | LED drive power power control circuit |
| CN110165883A (en) * | 2019-06-21 | 2019-08-23 | 海信（广东）空调有限公司 | A kind of non-bridge PFC circuits and frequency conversion product |
| CN210899753U (en) * | 2019-07-16 | 2020-06-30 | 昂宝电子（上海）有限公司 | LED drive circuit and control chip |
| CN211830573U (en) * | 2020-03-31 | 2020-10-30 | 成都理工大学工程技术学院 | Power factor correction device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769960A (en) * | 2011-05-06 | 2012-11-07 | 欧司朗股份有限公司 | Dimmable type LED (Light Emitting Diode) driver and control method of dimmable type LED driver |
-
2020
- 2020-12-15 CN CN202011477910.0A patent/CN112543532B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5414611A (en) * | 1992-10-12 | 1995-05-09 | Nec Corporation | Single transformer switching regulator |
| CN201700061U (en) * | 2010-06-11 | 2011-01-05 | 卢国泰 | High-power factor LED power driver |
| CN203117259U (en) * | 2013-01-21 | 2013-08-07 | 中国人民解放军63963部队 | Direct current leakage detection circuit |
| CN103904878A (en) * | 2014-01-09 | 2014-07-02 | 常州隆辉照明科技有限公司 | Efficient power factor compensating circuit without switch |
| CN203708101U (en) * | 2014-01-09 | 2014-07-09 | 常州隆辉照明科技有限公司 | Switch-free high-power factor compensation circuit |
| CN103841731A (en) * | 2014-03-21 | 2014-06-04 | 深圳天源中芯半导体有限公司 | Switch piecewise dimming circuit used for LED drive |
| CN104661408A (en) * | 2015-02-10 | 2015-05-27 | 深圳市佳比泰电子科技有限公司 | LED dimming circuit and LED lamp |
| CN104853476A (en) * | 2015-02-10 | 2015-08-19 | 深圳市佳比泰电子科技有限公司 | LED dimming circuit and LED lamp |
| CN105792416A (en) * | 2016-03-16 | 2016-07-20 | 浙江双宇电子科技有限公司 | Control circuit of switch light-dimming type LED lamp |
| CN206136369U (en) * | 2016-03-16 | 2017-04-26 | 浙江双宇电子科技有限公司 | Switch light modulation control circuit |
| CN206533573U (en) * | 2016-12-19 | 2017-09-29 | 深圳市崧盛电子股份有限公司 | A kind of power supply adjusting control circuit and power supply |
| CN206775383U (en) * | 2017-04-28 | 2017-12-19 | 深圳市源尤电源科技有限公司 | A kind of power circuit with fictitious load |
| CN207053839U (en) * | 2017-06-15 | 2018-02-27 | 佛山电器照明股份有限公司 | A kind of phase-cut dimming LED circuit with small night lamp function |
| CN207410557U (en) * | 2017-09-29 | 2018-05-25 | 上海瀚唯科技有限公司 | LED drive power power control circuit |
| CN110165883A (en) * | 2019-06-21 | 2019-08-23 | 海信（广东）空调有限公司 | A kind of non-bridge PFC circuits and frequency conversion product |
| CN210899753U (en) * | 2019-07-16 | 2020-06-30 | 昂宝电子（上海）有限公司 | LED drive circuit and control chip |
| CN211830573U (en) * | 2020-03-31 | 2020-10-30 | 成都理工大学工程技术学院 | Power factor correction device |
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