CN111093307A - LED lamp light modulation device - Google Patents
LED lamp light modulation device Download PDFInfo
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- CN111093307A CN111093307A CN201911130414.5A CN201911130414A CN111093307A CN 111093307 A CN111093307 A CN 111093307A CN 201911130414 A CN201911130414 A CN 201911130414A CN 111093307 A CN111093307 A CN 111093307A
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Abstract
The invention discloses a light-adjusting device for an LED lamp, and relates to the technical field of light-adjusting devices. The invention comprises a dimming module, an MCU module and a signal module; the signal module sends a dimming instruction of the control terminal to the dimming module through the MCU module; the dimming module comprises a signal driving circuit, a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2, a grid electrode of the first high-voltage field effect transistor Q1 is connected with a grid electrode of the second high-voltage field effect transistor Q2 and then connected with one end of the signal driving circuit, the other end of the signal driving circuit is connected with the MCU module, a drain electrode of the first high-voltage field effect transistor Q1 and a drain electrode of the second high-voltage field effect transistor Q2 are respectively connected with commercial power, and a source electrode of the first high-voltage field effect transistor Q1 is connected with a source electrode of the second high-voltage field effect transistor Q2; the MCU module outputs PWM signals to control the output voltages of the first high-voltage field effect tube and the second high-voltage field effect tube to control the dimming of the LED lamp. The invention realizes the dimming of the LED lamp supported by various communication modes, and has the advantages of high efficiency, low standby power consumption and no flicker.
Description
Technical Field
The invention relates to the technical field of dimming devices, in particular to a dimming device for an LED lamp.
Background
Along with the development of smart homes, the intelligent dimming requirement of the LED lamp is larger and larger. The existing dimming method adopts a WIFI communication mode, dimming operation is carried out by using a mobile phone APP, remote control can be carried out, operation can be carried out only based on a network and the WIFI communication mode, and offline operation is not supported; or a handheld remote control mode which can be controlled off line is utilized without depending on a network, but the remote control is not realized. The control methods are single and are not convenient to use.
For example, CN107071974A of the invention, published 2017, 8, 18 and entitled remote and local linkage control method of an intelligent dimming switch of an LED lamp, discloses a remote and local linkage control method of an intelligent dimming switch of an LED lamp, and includes an intelligent dimming switch of an LED lamp, a gateway and an APP module, and the control method mainly includes four steps of key scanning, signal processing, data transmission and remote feedback. The key scanning is to scan and judge the key action on the intelligent dimming switch of the LED lamp to obtain the operation signal of the LED lamp. The signal processing is to generate any one control signal of turning on, turning off, turning on and turning off the light by processing the operation signal, and to control the LED lamp. Data transmission is that LED lamp intelligent light-adjusting switch feeds back control signal to the gateway simultaneously to handle the storage to control signal through the gateway, and will handle the control signal after the storage and send for the APP module. Remote feedback is after the LED lamp outage, and the luminance state of LED lamp before the APP module will cut off the power supply sends for the gateway, and luminance data record when the gateway will cut off the power supply after the LED lamp circular telegram, is controlled LED lamp intelligent light adjusting switch by the gateway reversal to control the LED lamp and keep the luminance state before the outage after resuming the power supply. Although the LED lamp can be dimmed by the remote and local linkage control method for the intelligent dimming switch of the LED lamp, the state of the intelligent dimming switch of the LED lamp can be effectively fed back to the APP module through the gateway in the using process, the control mode is single, and great inconvenience can be caused in case of no network.
Disclosure of Invention
The invention overcomes the problems of single dimming control mode and dimming flicker in the prior art, and provides the LED lamp dimming device which has high efficiency, low standby power consumption, no flicker and support of multiple communication modes.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a light modulation device of an LED lamp comprises a light modulation module, an MCU module and a signal module; the device comprises a dimming module, an MCU module and a signal module; the signal module sends a dimming instruction of the control terminal to the dimming module through the MCU module; the dimming module comprises a signal driving circuit, a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2, a grid electrode of the first high-voltage field effect transistor Q1 is connected with a grid electrode of the second high-voltage field effect transistor Q2 and then connected with one end of the signal driving circuit, the other end of the signal driving circuit is connected with the MCU module, a drain electrode of the first high-voltage field effect transistor Q1 and a drain electrode of the second high-voltage field effect transistor Q2 are respectively connected with commercial power, and a source electrode of the first high-voltage field effect transistor Q1 is connected with a source electrode of the second high-voltage field effect transistor Q2; the MCU module outputs PWM signals to control the output voltages of the first high-voltage field-effect tube Q1 and the second high-voltage field-effect tube Q2 to control the dimming of the LED lamp.
The signal driving circuit can drive reverse signals and can also quickly release junction voltage, so that the PWM switching speed is higher, and the falling edge time is shorter. The two high-voltage field effect transistors can control two directions of alternating current, and the high-efficiency low-standby power consumption high-voltage field effect transistors are high in efficiency.
Preferably, the signal module comprises a WIFI module, and the WIFI module sends a dimming instruction of the app control terminal to the dimming module through the MCU module.
The light adjusting instruction can be sent remotely by utilizing the app control terminal, and a user can conveniently control the light adjusting instruction at any time and any place.
Preferably, the signal module further comprises a remote control module, and the remote control module sends the dimming instruction sent by the communication module of the handheld transmitter to the dimming module through the MCU module.
When the network is not available, the communication module of the handheld transmitter can be used for sending a dimming instruction to dim.
Preferably, the signal module further comprises a key module, and the key module sends a dimming instruction of a key to the dimming module through the MCU module.
The user can also directly carry out dimming operation through the key, so that the condition that dimming cannot be carried out when no network exists and the handheld transmitter cannot be found is avoided.
Preferably, the signal driving circuit comprises a first triode Q3, a first resistor R5, a second resistor R6 and a third resistor R16; a collector electrode of the first triode Q3 is sequentially connected with the MCU module through a first resistor R5 and a second resistor R6, and a collector electrode of the first triode Q3 is also connected with a grid electrode of the second field effect transistor; the emitter of the first triode Q3 is grounded; the base electrode of the first triode Q3 is connected with the MCU module through a third resistor R16; a voltage of 5V is connected between the first resistor R5 and the second resistor R6.
The signal driving circuit can drive signals and can also quickly release junction voltage, so that the PWM switching speed is higher, and the falling edge time is shorter.
Preferably, when the mains supply is connected by adopting an input live wire, an output live wire, a ground wire and a zero wire, the drain electrode of the first high-voltage field-effect tube Q1 of the dimming device is connected with the input live wire, and the drain electrode of the second high-voltage field-effect tube Q2 of the dimming device is connected with the output live wire; the dimming module is used for dimming the LED lamp which is connected in parallel between the input live wire L and the output live wire LOUT and is connected with the dimming module in parallel.
Preferably, when the mains supply is connected by adopting an input live wire, an output live wire and a ground wire, the drain electrode of the first high-voltage field-effect tube Q1 of the dimming device is connected with the input live wire, and the drain electrode of the second high-voltage field-effect tube Q2 of the dimming device is connected with the output live wire; the dimming module is used for dimming the LED lamp which is connected in series between the input live wire L and the output live wire LOUT and is connected in series with the dimming module.
Above-mentioned get the electric wiring mode for the dimming device can directly replace ordinary switch, and it is convenient to install, need not independent wiring.
Preferably, the dimming method implemented based on the dimming device comprising the dimming module, the signal module and the MCU module comprises:
step S01, the MCU module receives a dimming instruction from the signal module;
step S02, the MCU module adjusts the duty ratio of the output PWM signal according to the instruction, and sends the adjusted PWM signal to a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2 through a signal driving circuit; the dimming of the LED lamp is controlled by controlling the output voltage of the first high-voltage field effect transistor Q1 and the second high-voltage field effect transistor Q2.
Preferably, the signal module comprises a remote control module, a WIFI module and a key module; when the MCU module receives the dimming instructions from the remote control module, the WIFI module, and the key module, the dimming control of step S02 is performed; meanwhile, dimming instructions of the remote control module and the key module are respectively reported to the cloud end through the WIFI module and fed back to the app control terminal.
Therefore, the dimming condition of the LED lamp can be accurately known in real time on the app control terminal.
Preferably, the MCU module stores a dimming range set according to the PWM signal in advance.
The user can pre-store the dimming range set according to the PWM signal, and then the dimming of a certain section of unstable area is avoided in the later use, so that the LED lamp is more stable.
Compared with the prior art, the invention has the beneficial effects that:
the double high-voltage field effect transistors are used for dimming, so that the efficiency is high, and the standby power consumption is low. The touch key, the WIFI, the BLE and the sub1G communication technology are integrated, so that the advantages of the WIFI and the network are exerted, the remote control and cloud docking can be realized during online, and the functions of WIFI communication products are included; meanwhile, the BLE and sub1G remote control technologies are deeply combined, and multiple frequencies such as 315MHz, 433MHz, 868MHz and 915MHz can be supported. The power supply wiring mode enables the dimming device to directly replace a common switch, is convenient to install and does not need to be wired independently. The PWM signal frequency adjusted by the MCU module far exceeds the flicker frequency, so that the LED lamp does not flicker. The user can mark the unstable region, and then avoid the dimming of a certain unstable region in the future use, so that the LED lamp is more stable.
Drawings
Fig. 1 is a circuit diagram of a dimming module of the LED lamp dimming device according to the present invention.
Fig. 2 is an MCU module circuit according to a first embodiment of the LED lamp dimming device of the present invention.
Fig. 3 is a WIFI module circuit according to a first embodiment of the LED lamp dimming device of the present invention.
Fig. 4 is a circuit of a remote control module according to a first embodiment of the LED lamp dimming device of the present invention.
Fig. 5 is a key module circuit of a first embodiment of the LED lamp dimming device of the present invention.
Fig. 6 is a power circuit of a first embodiment of the LED lamp dimming device according to the present invention.
Fig. 7 is a schematic block diagram of a dimming method of the LED lamp dimming device according to the present invention.
Fig. 8 is a MCU module circuit and a key module circuit of a second embodiment of the LED lamp dimming device of the present invention.
Fig. 9 is a circuit of a remote control module of a second embodiment of the LED lamp dimming device of the present invention.
Fig. 10 is a switching power supply circuit of a second embodiment of the LED lamp dimming device according to the present invention.
Fig. 11 is a voltage difference obtaining circuit according to a second embodiment of the LED lamp dimming device of the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
The first embodiment is as follows:
as shown in fig. 1-6, an LED lamp dimming device includes a dimming module, an MCU module, and a signal module; the signal module sends a dimming instruction of the control terminal to the dimming module through the MCU module; the dimming module comprises a signal driving circuit, a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2, a grid electrode of the first high-voltage field effect transistor Q1 is connected with a grid electrode of the second high-voltage field effect transistor Q2 and then connected with one end of the signal driving circuit, the other end of the signal driving circuit is connected with the MCU module, a drain electrode of the first high-voltage field effect transistor Q1 and a drain electrode of the second high-voltage field effect transistor Q2 are respectively connected with commercial power, and a source electrode of the first high-voltage field effect transistor Q1 is connected with a source electrode of the second high-voltage field effect transistor Q2; the MCU module outputs PWM signals to control the output voltages of the first high-voltage field-effect tube Q1 and the second high-voltage field-effect tube Q2 to control the dimming of the LED lamp.
The signal module can be a WIFI module, a remote control module or a key module; or may include combinations of two or more of the foregoing modules; the remote control module can be a Bluetooth module or a Sub1G module; the modules described above may be present or substituted for each other. The signal module sends a dimming instruction to the dimming module through the MCU module.
The remote control module receives a dimming signal from a chip in the handheld transmitter, a communication module of the handheld transmitter corresponds to the remote control module, the communication module can be a Bluetooth module or a Sub1G module, and the modules can be coexisted or replaced with each other.
As shown in fig. 3, the WIFI chip of the WIFI module adopts ESP8266, and the UART0 and the TXDO port of the WIFI chip are connected to the P0.6 and P0.7 ports of the MCU chip through a fourth resistor R25 and a fifth resistor R26, respectively. The VDDPST port of the WIFI chip is grounded in parallel through a first capacitor Cw15, and the VDDPST port is connected with 3.3V voltage. The MTDO port is connected to the rear ground line via a sixth resistor Rw 18. A VDD3P3 port of the WIFI CHIP is connected to a second capacitor Cw13 and a third capacitor Cw14 which are connected in parallel, two ends of the second capacitor Cw13 and two ends of the third capacitor Cw14 are respectively connected to a 3.3V voltage and a ground line, and a seventh resistor Rw14 is further connected between the VDD3P3 port and the CHIP _ EN port. An LNA port of the WIFI chip is connected with a first inductor Lw5 and a first antenna interface ANT rear ground wire, and two ends of the first inductor Lw5 are connected with a fourth capacitor Cw16 and a fifth capacitor Cw17 in parallel. And the RES12K port of the WIFI chip is connected with the eighth resistor Rw9 and then is connected with a rear ground wire. The GND port of the WIFI chip is connected with a sixth capacitor Cw12, a ninth resistor Rw16 and a seventh capacitor Cw11 in sequence, two ends of the seventh capacitor Cw11 are respectively connected with a 3.3V voltage and a ground wire, and the EXT _ RSTB port of the WIFI chip is connected between the sixth capacitor Cw12 and the ninth resistor Rw 16. The XTAL _ IN port of the WIFI chip is connected with the tenth resistor Rw15, then is connected with the input end of the first crystal oscillator Xw1, and then is connected with the ground wire of the eighth capacitor Cw 9. The XTAL _ OUT port of the WIFI chip is respectively connected with the output end of the first crystal oscillator Xw1 and the ninth capacitor Cw10, and the ninth capacitor Cw10 is connected with the ground line. The VDDA port and the VDDD port of the WIFI chip are both connected with 3.3V voltage.
As shown in fig. 4, the remote control module includes a remote control chip, and a port D0 of the remote control chip is connected to an eleventh resistor R30 and then connected to a port P1.4 of the MCU chip. The CTH port of the remote control chip is connected with the rear grounding wire of a tenth capacitor C26. The VDD port of the remote control chip is grounded through an eleventh capacitor C25, and is connected with 3.3V voltage through a twelfth resistor R18. An ANT port of the remote control chip is sequentially connected with a twelfth capacitor C24 and a third inductor L3 through a second inductor L4 respectively and then grounded; the twelfth capacitor C24 is further connected to a second antenna interface ANT 1; the ANT port of the remote control chip is also grounded through a fourth inductor L5 and a twelfth capacitor C24 respectively. And the VSS port of the remote control chip is connected with the ground wire. And the ROSC port of the remote control chip is connected with the second crystal oscillator Y1 to form a rear ground wire.
As shown in fig. 5, the key module includes a key chip, the key chip adopts TK8023, and a port 1 and a port 8 of the key chip are respectively connected to a P0.4 port and a P0.3 port of the MCU chip. And the port 2 of the key chip is connected with a thirteenth capacitor C18 and then is grounded. The port 3 of the key chip is connected with 3.3V voltage. The port 4 of the key chip is connected to the ground line and also connected to the fourteenth capacitor C19, and the other end of the fourteenth capacitor C19 is connected to 3.3V. The terminal 5 of the key chip is connected with a thirteenth resistor R14, then connected with a third switch TK2, and simultaneously connected with the ground wire through a fifteenth capacitor C20. The port 6 of the key chip is connected with a fourteenth resistor R13, then connected with a second switch TK1, and simultaneously connected with the ground through a sixteenth capacitor C17. The port 7 of the key chip is connected with a fifteenth resistor R12, then connected with a first switch TK0, and simultaneously connected with the ground through a seventeenth capacitor C16.
As shown in fig. 1, the signal driving circuit includes a first transistor Q3, a first resistor R5, a second resistor R6, and a third resistor R16; a collector electrode of the first triode Q3 is sequentially connected with the MCU module through a first resistor R5 and a second resistor R6, and a collector electrode of the first triode Q3 is also connected with a grid electrode of the second field effect transistor; the emitter of the first triode Q3 is grounded; the base electrode of the first triode Q3 is connected with the MCU module through a third resistor R16; a voltage of 5V is connected between the first resistor R5 and the second resistor R6. In a low level, the circuit of the first resistor R5 and the second resistor R6 is turned on, and the PWM signal is input to the gate of the first high voltage fet Q1 and the gate of the second high voltage fet Q2, which are connected in parallel, via the second resistor R6 and the first resistor R5. In a high level, the circuit of the first transistor Q3 and the third resistor R16 is turned on, and the PWM signal is input to the gate of the first high voltage fet Q1 and the gate of the second high voltage fet Q2 which are connected in parallel via the third resistor R16 and the first transistor Q3.
As shown in fig. 2, the MCU module includes an MCU chip, the MCU chip employs N76E003, and the P0.6 port of the MCU chip is connected to the UART0 port of the WIFI chip after being connected to the fourth resistor R25. And the P0.7 port of the MCU chip is connected with the TXDO port of the WIFI chip after being connected with the fifth resistor R26. And the P2.0 port of the MCU chip is respectively connected with a sixteenth resistor R7 and an eighteenth capacitor C10, the other end of the sixteenth resistor R7 is connected with 3.3V voltage, and the other end of the eighteenth capacitor C10 is connected with a ground wire. The nineteenth capacitor C11 and the twentieth capacitor C12 are respectively connected in parallel between the CND port and the VDD port of the MCU chip, one end of the nineteenth capacitor C11 is connected with the ground wire, and the other end of the nineteenth capacitor C11 is connected with 3.3V voltage. The P1.4 port of the MCU chip is connected with the D0 port of the remote control chip. And P1.2 of the MCU chip is connected with the signal driving circuit. The P0.1 port of the MCU chip is connected with a seventeenth resistor R8 and a first light-emitting diode D5 and then connected with 3.3V voltage. The P0.3 port of the MCU chip is connected with the port 8 of the key chip. The P0.4 port of the MCU chip is connected with the port 1 of the key chip.
When the commercial power is connected by adopting an input live wire, an output live wire, a ground wire and a zero wire, the drain electrode of a first high-voltage field effect tube Q1 of the dimming device is connected with the input live wire, and the drain electrode of a second high-voltage field effect tube Q2 of the dimming device is connected with the output live wire; the dimming module is used for dimming the LED lamp which is connected in parallel between the input live wire L and the output live wire LOUT and is connected with the dimming module in parallel.
As shown in fig. 6, the LED lamp dimming device further includes a power module, the power module circuit includes a voltage-dropping chip U2, a port Vin of the voltage-dropping chip U2 is connected in parallel to an eighteenth resistor R4 and a twenty-first capacitor C7, one end of the eighteenth resistor R4 and one end of the twenty-first capacitor C7 are connected to a voltage of 5V, and the other end is connected to a ground line. The port Vout of the buck chip U2 is connected in parallel with the twenty-second capacitor C8 and the twenty-third capacitor C9, one end of the twenty-second capacitor C8 and one end of the twenty-third capacitor C9 are connected with 3.3V voltage, and the other end is connected with the ground wire. The power supply circuit outputs 3.3V voltage to the chip through the voltage reduction circuit.
As shown in fig. 7, when the dimming device is in operation, in step S01, the MCU module receives a dimming command from the signal module;
step S02, the MCU module adjusts the duty ratio of the output PWM signal according to the instruction, and sends the adjusted PWM signal to a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2 through a signal driving circuit; the dimming of the LED lamp is controlled by controlling the output voltage of the first high-voltage field effect transistor Q1 and the second high-voltage field effect transistor Q2. For example, a duty ratio of 0% -100% of the PWM signal corresponds to a regulated voltage value of 0V-3.3V and the brightness is darkest to brightest. And pre-storing the information in the MCU module, and adjusting the voltage of the field effect tube according to the PWM duty ratio to realize the brightness adjustment.
The signal module comprises a remote control module, a WIFI module and a key module; when the MCU module receives the dimming instructions from the remote control module, the WIFI module, and the key module, the dimming control of step S02 is performed; meanwhile, dimming instructions of the remote control module and the key module are respectively reported to the cloud end through the WIFI module and fed back to the app control terminal.
The specific form of operation after power-on allows the MCU to enter a learning configuration state after receiving the signal. The user can pre-store the dimming range set according to the PWM signal, and then the dimming of a certain section of unstable area is avoided in the later use, so that the LED lamp is more stable.
Example two:
as shown in fig. 1 and fig. 7 to 11, an LED lamp dimming device includes a dimming module, an MCU module, and a signal module; the signal module sends a dimming instruction of the control terminal to the dimming module through the MCU module; the dimming module comprises a signal driving circuit, a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2, a grid electrode of the first high-voltage field effect transistor Q1 is connected with a grid electrode of the second high-voltage field effect transistor Q2 and then connected with one end of the signal driving circuit, the other end of the signal driving circuit is connected with the MCU module, a drain electrode of the first high-voltage field effect transistor Q1 and a drain electrode of the second high-voltage field effect transistor Q2 are respectively connected with commercial power, and a source electrode of the first high-voltage field effect transistor Q1 is connected with a source electrode of the second high-voltage field effect transistor Q2; the MCU module outputs PWM signals to control the output voltages of the first high-voltage field-effect tube Q1 and the second high-voltage field-effect tube Q2 to control the dimming of the LED lamp.
The signal module can be a WIFI module, a remote control module or a key module; or may include a combination of both or more of the foregoing modules; the remote control module can be a Bluetooth module or a Sub1G module; the modules described above may be present or substituted for each other. The signal module sends a dimming instruction to the dimming module through the MCU module.
As shown in fig. 9, the remote control module uses a SUB1G chip, and the RO1 port and the RO2 port of the SUB1G chip are connected to two ends of the third oscillator Y2. An ANT port of the SUB1G chip is sequentially connected with a twenty-fifth capacitor Z2 and a third antenna interface ANT2 in series, a fifth inductor L7 is connected in parallel at a position, close to the ANT port, of the twenty-fifth capacitor Z2, a sixth inductor L6 and a twenty-fourth capacitor Z1 are connected in parallel at a position, far away from the ANT port, of the twenty-fifth capacitor Z2, and a ground wire is connected to the other end of the fifth inductor L7, the sixth inductor L6 and the twenty-fourth capacitor Z1. The VDD port of the SUB1G chip is connected with the ground line behind the twenty-sixth capacitor Z3 and the twenty-seventh capacitor Z4, and is connected with the Vin end of the buck chip U7. The VSS port of the SUB1G chip is grounded. The DO port of the SUB1G chip is connected with the PB3 port of the MCU chip after being connected with the fourteenth resistor R13. The CTH port of the SUB1G chip is connected to the twenty-eighth capacitor Z5 and then grounded. The CAGC port of the SUB1G chip is connected to the twenty-ninth capacitor Z6 and then grounded.
As shown in fig. 1, the signal driving circuit includes a first transistor Q3, a first resistor R5, a second resistor R6, and a third resistor R16; a collector electrode of the first triode Q3 is sequentially connected with the MCU module through a first resistor R5 and a second resistor R6, and a collector electrode of the first triode Q3 is also connected with a grid electrode of the second field effect transistor; the emitter of the first triode Q3 is grounded; the base electrode of the first triode Q3 is connected with the MCU module through a third resistor R16; a voltage of 5V is connected between the first resistor R5 and the second resistor R6. In a low level, the circuit of the first resistor R5 and the second resistor R6 is turned on, and the PWM signal is input to the gate of the first high voltage fet Q1 and the gate of the second high voltage fet Q2, which are connected in parallel, via the second resistor R6 and the first resistor R5. In a high level, the circuit of the first transistor Q3 and the third resistor R16 is turned on, and the PWM signal is input to the gate of the first high voltage fet Q1 and the gate of the second high voltage fet Q2 which are connected in parallel via the third resistor R16 and the first transistor Q3.
As shown in fig. 8, the MCU includes an MCU chip, and the MCU chip employs HT66F 017. The PB2, PB1, PB0 and PA3 ports of the MCU chip are connected with the key module, and the key module is composed of an ON key, an OFF key, an UP key, a DOWN key and an automatic control key FRA. The PB2 port of the MCU chip is connected with the grounding wire after the automatic control key FRA and the DOWN key DOWN, and the PB2 port is also connected with the grounding wire after the ON key and the UP key UP in sequence. And a PB1 port of the MCU chip is connected between the automatic control key FRA and the DOWN key DOWN. The PB0 port of the MCU chip is connected between the ON button and the UP button. And the PA3 port of the MCU chip is connected with a grounding wire after the OFF key is turned OFF. The port of the PA2 of the MCU chip is connected with a nineteenth resistor R11 and then connected with an input live wire, and simultaneously connected with the ground wire at the other end of the twentieth resistor R1, the first zener diode ZD1, the twentieth resistor R1 and the first zener diode ZD1 respectively. The PA1 of the MCU chip is sequentially connected with the twenty-first resistor RL7 and the second light-emitting diode LD7 rear ground wire. The port of the PA0 of the MCU chip is sequentially connected with a twenty-second resistor RL6 and a rear ground wire of a third light-emitting diode LD 6. The port of the PA7 of the MCU chip is sequentially connected with a twenty-third resistor RL5 and a rear ground wire of a fourth light-emitting diode LD 5. The port of the PA6 of the MCU chip is sequentially connected with a twenty-fourth resistor RL4 and a rear ground wire of a fifth light-emitting diode LD 4. The port PA5 of the MCU chip is sequentially connected with a twenty-fifth resistor RL3 and a rear grounding wire of a sixth light-emitting diode LD 3. And a PB5 port of the MCU chip is sequentially connected with a twenty-sixth resistor RL2 and a seventh light-emitting diode LD2 rear ground wire. And a PB4 port of the MCU chip is sequentially connected with a twenty-seventh resistor RL1 and an eighth light-emitting diode LD1 rear ground wire. And the PA4 port of the MCU chip is connected with the signal driving circuit of the dimming module. And the PB3 port of the MCU chip is connected with the DO port of the SUB1G chip after being connected with the fourteenth resistor R13. And the VSS end of the MCU chip is connected with the ground wire. The VDD end of the MCU chip is connected with the Vin end of the voltage reduction chip U7.
When the mains supply is connected by adopting an input live wire, an output live wire and a ground wire, the drain electrode of a first high-voltage field-effect tube Q1 of the dimming device is connected with the input live wire, and the drain electrode of a second high-voltage field-effect tube Q2 of the dimming device is connected with the output live wire; the dimming module is used for dimming the LED lamp which is connected in series between the input live wire L and the output live wire LOUT and is connected in series with the dimming module.
The LED lamp dimming device further comprises a power supply module, and the power supply module is divided into a switching power supply module and a voltage difference power-taking circuit module.
As shown in fig. 10, the rectifier bridge port 1 of the switching power supply module is connected to the seventh inductor L0 and then connected to the input live wire. The port 3 of the rectifier bridge is connected with the output live wire, and is connected with the thirtieth capacitor C0 and is connected with the input live wire end. The port 2 of the rectifier bridge is connected with a twenty-eighth resistor R15 and then connected with the port 6 of the transformer T1. The port 4 of the rectifier bridge is connected with a thirty-first capacitor C2 and then is connected with the port 4 of a transformer T1, and is connected with a base of a second triode Q4 after being connected with a second Zener diode ZD2, a collector of the second triode Q4 is connected with a base of a third triode Q5, a collector of the third triode Q5 is connected with the port 5 of the transformer T1, the other wire is connected with the second Zener diode ZD2 and then is also connected with a twenty-ninth resistor R21 and then is connected with an emitter of the third triode Q5, and after being connected with a thirty-first resistor R19, the thirty-first resistor R19 is connected between the thirty-first capacitor C2 and the port 4 of the rectifier bridge. The emitter of the second triode Q4 is connected between the rectifier bridge port 4 and the thirtieth resistor R19, the collector of the second triode Q4 is connected to the third resistor R16, and the other end is connected between the port 6 of the transformer T1 and the twenty-eighth resistor R15. The rectifier bridge port 4 is further connected with a second diode D14, the other end of the second diode D14 is respectively connected with the port 3 of the transformer T1 and a thirty-second capacitor C1 and a thirty-first resistor R17 which are sequentially connected, and the other end of the thirty-first resistor R17 is connected between a third resistor R16 and the collector of the second triode Q4. A thirty-third capacitor C4 is also connected in parallel between the rectifier bridge port 4 and the port 6 of the transformer T1. The port 2 of the transformer T1 is connected with the third diode D15 and the fourth diode D4 in a forward direction, then connected with the fifth diode D6 in a reverse direction, and further connected with the port 4 of the interface chip CON4, and the Vout port of the buck chip U7 is connected between the fourth diode D4 and the fifth diode D6. Port 1 of the transformer T1 is connected to port 3 of the interface chip CON 4. And a thirty-fourth capacitor C3 and a thirty-fourth capacitor C3 are connected in parallel between the port 1 of the transformer T1 and the third diode D15 and the fourth diode D4 as ground lines.
As shown in fig. 11, the voltage difference obtaining circuit module includes a preamplifier chip, a third high voltage fet Q7, and a fourth transistor Q6. The source and the drain of the third high-voltage field effect transistor Q7 are connected in parallel with a sixth diode D10, the source of the third high-voltage field effect transistor Q7 is connected with the thirtieth capacitor C0 and then connected with the input live wire end, and the drain of the third high-voltage field effect transistor Q7 is connected with the drain of the first high-voltage field effect transistor Q1. The source of the third high voltage fet Q7 is further connected to a seventh diode D8, a first diode D7, and a thirty-second resistor RR in sequence, and then connected to the port 2 of the interface chip CON 4. The source of the third high voltage fet Q7 is also connected to port 1 of the interface chip CON 4. The gate of the third high-voltage field effect transistor Q7 is connected to the base of the fourth triode Q6 through a thirty-third resistor R10 and a thirty-fourth resistor R2, a thirty-fifth resistor R20 is connected in parallel between the gate and the drain of the third high-voltage field effect transistor Q7, both ends of the thirty-third resistor R10 are connected in parallel with a thirty-fifth capacitor C27, the thirty-third resistor R10 is connected to the anode of the fourth zener diode ZD5, and one end of the gate of the third high-voltage field effect transistor Q7 is connected to the fourth zener diode ZD5 and connected to the cathode of the seventh diode D8. A thirty-sixth capacitor C28 is connected in parallel between the anode of the first diode D7 and the drain of the third high voltage fet Q7. The thirty-seventh capacitor C29 is connected in parallel between the cathode of the first diode D7 and the drain of the third high-voltage field effect transistor Q7, and the junction of the cathode of the first diode D7 and the thirty-seventh capacitor C29 is connected with 12V voltage. The emitter set of the fourth transistor Q6 is connected to the connection of the source of the third high voltage fet Q7 to the port 1 of the interface chip CON 4. The preamplifier chip employs LM 321. The + IN port of the preamplifier chip is connected to the positive terminal of a thirty-sixth capacitor C28 via a third zener diode ZD4, and a thirty-eighth capacitor C30 and a fourth resistor R25 are connected IN parallel between the source of the third high voltage fet Q7 and the connection connected to the port 1 of the interface chip CON4 IN turn. the-IN port of the preamplifier chip is connected to the collector of the fourth triode Q6 via a thirty-sixth resistor R3, and is connected IN parallel with a twenty-ninth resistor R21 between the first diode D7 and the thirty-second resistor RR at a position not connected with the thirty-sixth resistor R3, respectively, and is connected IN parallel with a thirty-seventh resistor R22 to a connection where the source of the third high voltage fet Q7 is connected with the port 1 of the interface chip CON 4. The V + port of the preamplifier chip is connected to the positive terminal of a thirty-seventh capacitor C29. The OUT port of the preamplifier chip is connected between the thirty-third resistor R10 and the thirty-fourth resistor R2. The GND port of the preamplifier chip is connected to the connection between the source of the third high voltage fet Q7 and port 1 of the interface chip CON 4.
As shown in fig. 7, when the dimming device is in operation, in step S01, the MCU module receives a dimming command from the signal module;
step S02, the MCU module adjusts the duty ratio of the output PWM signal according to the instruction, and sends the adjusted PWM signal to a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2 through a signal driving circuit; the dimming of the LED lamp is controlled by controlling the output voltage of the first high-voltage field effect transistor Q1 and the second high-voltage field effect transistor Q2. For example, a duty ratio of 0% -100% of the PWM signal corresponds to a regulated voltage value of 0V-3.3V and the brightness is darkest to brightest. And pre-storing the information in the MCU module, and adjusting the voltage of the field effect tube according to the PWM duty ratio to realize the brightness adjustment.
The signal module comprises a remote control module, a WIFI module and a key module; when the MCU module receives the dimming instructions from the remote control module, the WIFI module, and the key module, the dimming control of step S02 is performed; meanwhile, dimming instructions of the remote control module and the key module are respectively reported to the cloud end through the WIFI module and fed back to the app control terminal.
The specific form of operation after power-on allows the MCU to enter a learning configuration state after receiving the signal. The user can pre-store the dimming range set according to the PWM signal, and then the dimming of a certain section of unstable area is avoided in the later use, so that the LED lamp is more stable.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A light modulation device of an LED lamp is characterized by comprising a light modulation module, an MCU module and a signal module; the signal module sends a dimming instruction of the control terminal to the dimming module through the MCU module; the dimming module comprises a signal driving circuit, a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2, a grid electrode of the first high-voltage field effect transistor Q1 is connected with a grid electrode of the second high-voltage field effect transistor Q2 and then connected with one end of the signal driving circuit, the other end of the signal driving circuit is connected with the MCU module, a drain electrode of the first high-voltage field effect transistor Q1 and a drain electrode of the second high-voltage field effect transistor Q2 are respectively connected with commercial power, and a source electrode of the first high-voltage field effect transistor Q1 is connected with a source electrode of the second high-voltage field effect transistor Q2; the MCU module outputs PWM signals to control the output voltages of the first high-voltage field-effect tube Q1 and the second high-voltage field-effect tube Q2 to control the dimming of the LED lamp.
2. The LED lamp dimming device according to claim 1, wherein the signal module further comprises a WIFI module, and the WIFI module sends a dimming instruction of an app control terminal to the dimming module through the MCU module.
3. The dimming apparatus for LED lamp according to claim 2, wherein the signal module further comprises a remote control module, and the remote control module sends the dimming command sent by the communication module of the handheld transmitter to the dimming module via the MCU module.
4. The LED lamp dimming device according to claim 3, wherein the signal module comprises a key module, and the key module sends a dimming instruction of a key to the dimming module through the MCU module.
5. The dimming device of claim 1, wherein the signal driving circuit comprises a first transistor Q3, a first resistor R5, a second resistor R6, and a third resistor R16; a collector electrode of the first triode Q3 is sequentially connected with the MCU module through a first resistor R5 and a second resistor R6, and a collector electrode of the first triode Q3 is also connected with a grid electrode of the second field effect transistor; the emitter of the first triode Q3 is grounded; the base electrode of the first triode Q3 is connected with the MCU module through a third resistor R16; a voltage of 5V is connected between the first resistor R5 and the second resistor R6.
6. The LED lamp dimming device according to claim 1, wherein when the mains supply is connected with an input live wire, an output live wire, a ground wire and a neutral wire, the drain of the first high voltage FET Q1 of the dimming device is connected with the input live wire, and the drain of the second high voltage FET Q2 of the dimming device is connected with the output live wire; the dimming module is used for dimming the LED lamp which is connected in parallel between the input live wire L and the output live wire LOUT and is connected with the dimming module in parallel.
7. The LED lamp dimming device according to claim 1, wherein when the mains supply is connected to the input live wire, the output live wire and the ground wire, the drain of the first high voltage FET Q1 of the dimming device is connected to the input live wire, and the drain of the second high voltage FET Q2 of the dimming device is connected to the output live wire; the dimming module is used for dimming the LED lamp which is connected in series between the input live wire L and the output live wire LOUT and is connected in series with the dimming module.
8. A dimming method of an LED lamp is characterized by being realized based on a dimming device comprising a dimming module, a signal module and an MCU module; the dimming method comprises the following steps:
step S01, the MCU module receives a dimming instruction from the signal module;
step S02, the MCU module adjusts the duty ratio of the output PWM signal according to the instruction, and sends the adjusted PWM signal to a first high-voltage field effect transistor Q1 and a second high-voltage field effect transistor Q2 through a signal driving circuit; the dimming of the LED lamp is controlled by controlling the output voltage of the first high-voltage field effect transistor Q1 and the second high-voltage field effect transistor Q2.
9. The dimming method for the LED lamp according to claim 8, wherein the signal module comprises a remote control module, a WIFI module, a key module; when the MCU module receives the dimming instructions from the remote control module, the WIFI module, and the key module, the dimming control of step S02 is performed; meanwhile, dimming instructions of the remote control module and the key module are respectively reported to the cloud end through the WIFI module and fed back to the app control terminal.
10. The method of claim 8, further comprising: and in the MCU module, a dimming range set according to the PWM signal is prestored.
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| CN201911130414.5A CN111093307A (en) | 2019-11-19 | 2019-11-19 | LED lamp light modulation device |
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| CN112543529A (en) * | 2020-11-24 | 2021-03-23 | 广州朗国电子科技有限公司 | Control circuit of LED lamp |
| CN114945226A (en) * | 2022-07-25 | 2022-08-26 | 广东东菱电源科技有限公司 | Low standby power consumption circuit |
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