CN111698815B - Method for realizing LED voltage self-adaption based on voltage boosting and voltage reducing integrated circuit - Google Patents
Method for realizing LED voltage self-adaption based on voltage boosting and voltage reducing integrated circuit Download PDFInfo
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- CN111698815B CN111698815B CN202010407952.0A CN202010407952A CN111698815B CN 111698815 B CN111698815 B CN 111698815B CN 202010407952 A CN202010407952 A CN 202010407952A CN 111698815 B CN111698815 B CN 111698815B
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- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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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
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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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- 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
- H05B45/345—Current stabilisation; Maintaining constant current
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Abstract
The invention discloses an LED voltage self-adaption realized based on a boosting integrated circuit and a voltage-reducing integrated circuit, belongs to the technical field of LED voltage self-adaption, and comprises a boosting integrated circuit, a voltage-reducing integrated circuit and an LED string.
Description
Technical Field
The invention relates to the technical field of LED voltage self-adaptation, in particular to a method for realizing LED voltage self-adaptation based on a boosting and reducing integrated circuit.
Background
With the development of technology, the application of LEDs in automotive lighting is increasing. Particularly, due to the small size, the LED can be matched with abundant shape and line changes, so that the identification degree of the automobile lamp is improved, and the beautiful appearance design is matched; in the future, with the continuous promotion of technologies and markets, the application of the LED in the field of automobile illumination is more extensive and comprehensive. Along with the development of modern industry, the environmental protection problem is increasingly prominent, low carbon and environmental protection become social consensus, and the same requirements are also provided for the automobile industry, the prior art usually adopts a design scheme that constant voltage and constant current are adopted at two ends of an LED, and the output power is constant; according to the invention, the output voltage of the boosting integrated circuit is set, after the LED is lightened, the actual working voltages at two ends of the LED string are detected by the voltage-reducing integrated circuit, and the output voltage of the boosting integrated circuit is reduced in an operation state in a self-adaptive mode according to the actual working voltages at two ends of the LED string, so that the output power is reduced, the power consumption is reduced, and the energy efficiency of the LED lamp is improved.
Disclosure of Invention
The invention aims to provide a method for realizing LED voltage self-adaption based on a boosting and reducing integrated circuit, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for realizing LED voltage self-adaption based on a voltage boosting and reducing integrated circuit is characterized by comprising the following steps: the method for realizing the LED voltage self-adaption comprises five steps, namely: determining rated voltages at two ends of the LED string, and then determining output voltage of constant voltage drive; the second step is that: when power-on initialization is carried out, the output voltage of the boost integrated circuit is set according to the output voltage driven by the constant voltage so as to realize constant voltage output; the third step: setting the output current of the voltage-reducing integrated circuit according to the current requirement of the LED string to realize constant current output; the fourth step: the voltage reduction integrated circuit automatically detects the voltage actually required by two ends of the LED string; the fifth step: automatically resetting the output voltage of the boost integrated circuit in an operating state according to the actually required voltage at the two ends of the LED string;
the circuit elements for realizing the LED voltage self-adaption comprise a boost conversion chip, a constant current output chip, a microcontroller, a bus transceiver, a diode D1, a diode D2, a diode D5, a diode D6, a diode D7, a diode D8, a capacitor C1, a capacitor C2, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, an inductor L8, a resistor R8, a transistor M8, a light emitting diode D8, a light emitting diode D emitting diode 8, a light emitting diode D emitting diode 8, a light emitting diode D8, a light emitting diode D8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D8, a light emitting diode D, a light emitting diode 8, a light emitting diode D;
the diode D8 has an anode electrically connected to a power supply, a cathode electrically connected to a first end of a capacitor C1, a first end of a capacitor C2, a first end of an inductor L1, a first end of an inductor L2, a voltage boosting switching chip VBAT pin, a first end of a capacitor C18, a bus transceiver VBAT pin, and a first end of a capacitor C19, the first end of the capacitor C16 is electrically connected to a VGG pin of a voltage boosting switching chip, the second end of the capacitor C16 is electrically connected to ground, the second end of the capacitor C18 is electrically connected to ground, the VCC pin of the voltage boosting switching chip is electrically connected to a VCC pin of a constant current output chip, a VCC pin of a bus transceiver, a VCC pin of a microcontroller, and a first end of a capacitor C20, the second end of the capacitor C20 is electrically connected to ground, the EN pin of the voltage boosting switching chip is electrically connected to a EN-1 pin of the microcontroller, the CSB pin of the voltage boosting switching chip is electrically connected to a CSB1 pin, the SDI pin of the voltage boosting switching chip is electrically connected to a SDI pin of the microcontroller and the output chip, the boost conversion chip SDO pin is electrically connected with the microcontroller SDO pin and the constant current output chip SDO pin, the boost conversion chip SCLK pin is electrically connected with the microcontroller SCLK pin and the constant current output chip SCLK pin, the boost conversion chip GND pin is electrically connected with ground, the boost conversion chip G1 pin is electrically connected with the base of the transistor M1, the collector of the transistor M1 is electrically connected with the second end of the inductor L1 and the anode of the diode D1, the emitter of the transistor M1 is electrically connected with the boost conversion chip SNH1 pin and the first end of the resistor R1, the second end of the resistor R1 is electrically connected with the pin of the boost conversion chip SNL1 and ground, the cathode of the diode D1 is electrically connected with the first end of the capacitor C8, the cathode of the diode D2, the first end of the capacitor C9, the pin of the boost conversion chip FB1, the pin of the boost conversion chip FB2, the constant current output chip VIN pin, the collector of the transistor M5, The collector of the transistor M6 is electrically connected with the collector of the transistor M7, the second end of the capacitor C8 is electrically connected with ground, the second end of the capacitor C9 is electrically connected with ground, the second end of the inductor L2 is electrically connected with the collector of the transistor M2 and the anode of the diode D2, the base of the transistor M2 is electrically connected with the pin G2 of the boost converter chip, the emitter of the transistor M2 is electrically connected with the pin SNH2 of the boost converter chip and the first end of the resistor R2, and the second end of the resistor R2 is electrically connected with the pin SNL2 and ground.
The voltage at two ends of the LED string can be automatically detected and adjusted in a self-adaptive mode on the premise of not influencing the performance of the LED car lamp, so that the energy consumption of the LED car lamp is reduced, and the energy efficiency of the LED car lamp is improved; the method for determining the output voltage of the constant voltage drive comprises the following steps: the output voltage of the constant voltage drive is more than 20% higher than the voltage actually required by two ends of the LED, so that the processing can provide a premise for batch production; after the constant current is set, the LED can be lightened; the voltage actually required by the two ends of the LED string can be detected through the voltage detection function of the internal load of the voltage reduction integrated circuit; according to the actually required voltage at the two ends of the LED string, the output voltage of the boosting integrated circuit is automatically reset in the running state, and the newly set output voltage is lower than the output voltage set during power-on initialization, so that the output power is reduced compared with the previous output power, the output power is reduced, namely the actually consumed energy quantity is reduced, the power consumption of the product is reduced, and the energy efficiency is improved.
Preferably, outputting constant voltage is realized by a boost conversion chip, outputting constant current is realized by a constant current output chip, detecting actually required voltage at two ends of the LED string is realized by a voltage reduction integrated circuit internal load voltage detection function, automatically resetting the output voltage of the boost integrated circuit according to the actually required voltage at the two ends of the LED string is realized by a microcontroller, and data communication processing is realized by a bus transceiver;
the boost conversion chip is a highly integrated and flexible two-phase DC-DC boost converter IC, and is provided with an SPI interface, can be in control and diagnostic communication with the microcontroller and provide optimized power supply voltage, and the bus transceiver can realize low-speed data communication processing on an automobile and is suitable for LIN slave node application.
The second end of the capacitor C19 is electrically connected with a GND pin and ground of a bus transceiver, an LIN pin of the bus transceiver is electrically connected with an LIN bus, an RSTN pin of the bus transceiver is electrically connected with an RSTN pin of a microcontroller, an EN pin of the bus transceiver is electrically connected with an EN pin of the microcontroller, a TXD pin of the bus transceiver is electrically connected with a TXD pin of the microcontroller, a RXD pin of the bus transceiver is electrically connected with a RXD pin of the microcontroller, a GND pin of the microcontroller is electrically connected with ground, a EN-2 pin of the microcontroller is electrically connected with an EN pin of a constant current output chip, a CSB2 pin of the microcontroller is electrically connected with a CSB pin of the constant current output chip, a SDI pin of the microcontroller is electrically connected with a SDI pin of the constant current output chip, a SDO pin of the microcontroller is electrically connected with a SDO pin of the constant current output chip, and a PWM1 pin of the microcontroller is electrically connected with a PWM1 pin of the constant current output chip, the pin of the microcontroller PWM2 is electrically connected with the pin of a constant current output chip PWM2, the pin of the microcontroller PWM3 is electrically connected with the pin of the constant current output chip PWM3, the pin of the constant current output chip VGG is electrically connected with the first end of a capacitor C15, the second end of the capacitor C15 is electrically connected with the ground, the pin of the constant current output chip G1 is electrically connected with the base of a transistor M5, the emitter of the transistor M5 is electrically connected with the second end of a capacitor C5, the first end of an inductor L5, the pin of a constant current output chip LX1 and the cathode of a diode D5, the first end of a capacitor C5 is electrically connected with the pin of the constant current output chip BS1, the anode of a diode D5 is electrically connected with the ground, the second end of the inductor L5 is electrically connected with the pin of the constant current output chip RH1 and the first end of a resistor R5, the second end of a resistor 539R 5 is electrically connected with the pin of the RL output chip 1, the first end of the capacitor C12 and the anode of a light-emitting diode D9, the second end of the capacitor C12 is electrically connected with ground, the cathode of the light emitting diode D9 is electrically connected with the anode of the light emitting diode D10, the cathode of the light emitting diode D10 is electrically connected with the anode of the light emitting diode D11, the cathode of the light emitting diode D11 is electrically connected with ground, the pin G2 of the constant current output chip is electrically connected with the base of the transistor M6, the emitter of the transistor M6 is electrically connected with the second end of the capacitor C6, the first end of the inductor L6, the pin LX2 of the constant current output chip and the cathode of the diode D6, the first end of the capacitor C6 is electrically connected with the pin BS2 of the constant current output chip, the anode of the diode D6 is electrically connected with ground, the second end of the inductor L6 is electrically connected with the pin RH2 of the constant current output chip and the first end of the resistor R6, the second end of the resistor R6 is electrically connected with the pin RL2 of the constant current output chip RL2, the first end of the capacitor C13 is electrically connected with the anode of the light emitting diode D12, and the second end of the capacitor C13 is electrically connected with ground, the cathode of the light emitting diode D12 is electrically connected with the anode of the light emitting diode D13, the cathode of the light emitting diode D13 is electrically connected with the anode of the light emitting diode D14, the cathode of the light emitting diode D14 is electrically connected with ground, the pin of the constant current output chip G3 is electrically connected with the base of the transistor M7, the emitter of the transistor M7 is electrically connected with the second end of the capacitor C7, the first end of the inductor L7, the pin of the constant current output chip LX3 and the cathode of the diode D7, the first end of the capacitor C7 is electrically connected with the pin of the constant current output chip BS3, the anode of the diode D7 is electrically connected with ground, the second end of the inductor L7 is electrically connected with the pin of the constant current output chip RH3 and the first end of the resistor R7, the second end of the resistor R7 is electrically connected with the pin of the constant current output chip RL3, the first end of the capacitor C14 and the anode of the light emitting diode D15, the second end of the capacitor C14 is electrically connected with the ground, the cathode of the diode D15 is electrically connected with the anode of the light emitting diode D16, the cathode of the light emitting diode D16 is electrically connected with the anode of the light emitting diode D17, and the cathode of the light emitting diode D17 is electrically connected with the ground;
through the circuit connection, the voltage at two ends of the LED string is automatically detected and adjusted in a self-adaptive mode on the premise of not influencing the performance of the LED car lamp, so that the energy consumption of the LED car lamp is reduced, and the energy efficiency of the LED car lamp is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. after the output voltage of the boosting integrated circuit is set, the LED is lightened, the voltage-reducing integrated circuit detects the actual working voltage at two ends of the LED string, then the output voltage of the boosting integrated circuit is reduced in an operation state according to the actual working voltage at two ends of the LED string, namely, the voltage at two ends of the LED string is automatically detected and adjusted on the basis of not influencing the performance of the LED car lamp.
2. In the prior art, a constant voltage and a constant current are generally adopted at two ends of an LED, and the voltage output by the constant voltage is higher than the actually required voltage at two ends of an LED string. Under the condition of constant current, the output voltage is set to be higher, the power consumption is increased, the energy efficiency is lower, the voltage at the two ends of the LED string can be adjusted according to the actual working voltage at the two ends of the LED string and the actual condition, so that the energy consumption of the LED car lamp is reduced, and the efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of an operating principle of a method for realizing LED voltage self-adaptation based on a voltage boosting and reducing integrated circuit according to the present invention;
FIG. 2 is a schematic diagram of an adaptive flow structure of a method for implementing LED voltage adaptation based on a boost and buck integrated circuit according to the present invention;
fig. 3 is a schematic diagram of an internal circuit connection structure of the method for realizing LED voltage adaptation based on the boost and buck integrated circuits according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b): as shown in fig. 1-3, a method for implementing LED voltage adaptation based on a boost and buck integrated circuit is characterized in that: the method for realizing the LED voltage self-adaption comprises five steps, namely: determining rated voltages at two ends of the LED string, and then determining output voltage of constant voltage drive; the second step is that: when power-on initialization is carried out, the output voltage of the boost integrated circuit is set according to the output voltage driven by the constant voltage so as to realize constant voltage output; the third step: setting the output current of the voltage-reducing integrated circuit according to the current requirement of the LED string to realize constant current output; the fourth step: the voltage reduction integrated circuit automatically detects the voltage actually required by two ends of the LED string; the fifth step: automatically resetting the output voltage of the boost integrated circuit in an operating state according to the actually required voltage at the two ends of the LED string;
the circuit elements for realizing the LED voltage self-adaption comprise a boost conversion chip, a constant current output chip, a microcontroller, a bus transceiver, a diode D1, a diode D2, a diode D5, a diode D6, a diode D7, a diode D8, a capacitor C1, a capacitor C2, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, an inductor L8, a resistor R8, a transistor M8, a light emitting diode D8, a light emitting diode D emitting diode 8, a light emitting diode D emitting diode 8, a light emitting diode D8, a light emitting diode D8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D8, a light emitting diode D, a light emitting diode 8, a light emitting diode D;
the anode of the diode D8 is electrically connected with the power supply, the cathode is electrically connected with the first end of the capacitor C1, the first end of the capacitor C2, the first end of the inductor L1, the first end of the inductor L2, the VBAT pin of the boost conversion chip, the first end of the capacitor C18, the VBAT pin of the bus transceiver and the first end of the capacitor C19, the first end of the capacitor C16 is electrically connected with the VGG pin of the boost conversion chip, the second end of the capacitor C16 is electrically connected with ground, the second end of the capacitor C18 is electrically connected with ground, the VCC pin of the boost conversion chip is electrically connected with the VCC pin of the constant current output chip, the VCC pin of the bus transceiver, the VCC pin of the microcontroller and the first end of the capacitor C20, the second end of the capacitor C20 is electrically connected with ground, the EN pin of the boost conversion chip is electrically connected with the EN-1 pin of the microcontroller, the CSB pin of the boost conversion chip is electrically connected with the CSB1 pin, the SDI pin of the microcontroller is electrically connected with the SDI pin of the microcontroller, the pin of the boost conversion chip SDO is electrically connected with the pin of the microcontroller SDO and the pin of the constant current output chip SDO, the pin of the boost conversion chip SCLK is electrically connected with the pin of the microcontroller SCLK and the pin of the constant current output chip SCLK, the pin of the boost conversion chip GND is electrically connected with ground, the pin of the boost conversion chip G1 is electrically connected with the base of the transistor M1, the collector of the transistor M1 is electrically connected with the second end of the inductor L1 and the anode of the diode D1, the emitter of the transistor M1 is electrically connected with the pin of the boost conversion chip SNH1 and the first end of the resistor R1, the second end of the resistor R1 is electrically connected with the pin of the boost conversion chip SNL1 and ground, the cathode of the diode D1 is electrically connected with the first end of the capacitor C8, the cathode of the diode D2, the first end of the capacitor C9, the pin of the boost conversion chip FB1, the pin of the boost conversion chip 2, the pin of the constant current output chip VIN, the pin of the transistor M5, the collector of the transistor M6 and the collector of the transistor M7, the second end of the capacitor C8 is electrically connected to ground, the second end of the capacitor C9 is electrically connected to ground, the second end of the inductor L2 is electrically connected to the collector of the transistor M2 and the anode of the diode D2, the base of the transistor M2 is electrically connected to the pin G2 of the boost converter chip, the emitter of the transistor M2 is electrically connected to the pin SNH2 of the boost converter chip and the first end of the resistor R2, and the second end of the resistor R2 is electrically connected to the pin SNL2 and ground.
The self-adaptive working process comprises the following steps: the method comprises the following steps that MCU is electrified and initialized, the MCU is configured through an SPI bus and initializes a boosting integrated circuit, the MCU sets the voltage output by the boosting integrated circuit during the electrification and initialization through the SPI bus, the MCU is configured through the SPI bus and initializes a voltage reducing integrated circuit, the MCU sets the working current of the voltage reducing integrated circuit through the SPI bus and starts the boosting integrated circuit, the MCU starts the voltage reducing integrated circuit, the LED is lightened, the voltage reducing integrated circuit detects the voltage actually needed by two ends of an LED string through AD sampling, the MCU reads the voltage actually needed by two ends of the LED string from the voltage reducing integrated circuit through the SPI bus, and the MCU resets the output voltage of the boosting integrated circuit through the SPI bus;
the english name of the boost integrated circuit is: an NXP Boost IC; the english name of the buck integrated circuit is: NXP Buck IC; the Chinese name of the MCU is a micro control unit; the SPI bus is a high-speed, full-duplex, synchronous communication bus.
Firstly, the output voltage of the boosting integrated circuit is set according to a common mode, after the LED is lightened, the actual working voltage at two ends of the LED string is detected by the voltage-reducing integrated circuit, the output voltage of the boosting integrated circuit is reduced in an operation state according to the actual working voltage at two ends of the LED string, the output power is equal to the output voltage multiplied by the output current, the output power is reduced, the energy efficiency refers to the ratio of the energy quantity of the acting energy to the energy quantity of the actual consumption, the rated power of the LED is not changed, namely, the energy quantity of the acting energy is not changed, the output power is the energy of the actual consumption, the output power is reduced, namely, the energy quantity of the actual consumption is reduced, the power consumption is reduced, and the energy efficiency is improved.
The output constant voltage is realized by a boost conversion chip, the output constant current is realized by a constant current output chip, the voltage actually required for detecting the two ends of the LED string is realized by the internal load voltage detection function of the buck integrated circuit, the output voltage of the boost integrated circuit is automatically reset according to the actually required voltage of the two ends of the LED string is realized by a microcontroller, and the data communication processing is realized by a bus transceiver.
The model of the boost conversion chip is ASL2500SHN, the constant current output chip is ASLxxXXSHN series chips, the model of the microcontroller is mu C, and the model of the bus transceiver is TJA 1028; the boost conversion chip ASL2500SHN is a highly integrated and flexible two-phase DC-DC boost converter IC, and is provided with an SPI interface, can perform control and diagnostic communication with an external microcontroller mu C and provide optimized power supply voltage, and a bus transceiver TJA1028 can realize low-speed data communication processing on an automobile and is suitable for LIN slave node application.
The second end of the capacitor C19 is electrically connected with a GND pin of the bus transceiver and the ground, an LIN pin of the bus transceiver is electrically connected with an LIN bus, an RSTN pin of the bus transceiver is electrically connected with an RSTN pin of the microcontroller, an EN pin of the bus transceiver is electrically connected with an EN pin of the microcontroller, a TXD pin of the bus transceiver is electrically connected with a TXD pin of the microcontroller, a RXD pin of the bus transceiver is electrically connected with a RXD pin of the microcontroller, a GND pin of the microcontroller is electrically connected with the ground, a EN-2 pin of the microcontroller is electrically connected with an EN pin of the constant current output chip, a CSB2 pin of the microcontroller is electrically connected with a CSB pin of the constant current output chip, a SDI pin of the microcontroller is electrically connected with a SDI pin of the constant current output chip, a SDO pin of the microcontroller is electrically connected with an SDO pin of the constant current output chip, a PWM1 pin of the microcontroller is electrically connected with a PWM1 pin of the constant current output chip, a PWM2 pin of the microcontroller is electrically connected with a PWM2 pin of the constant current output chip, a pin of the microcontroller PWM3 is electrically connected to a pin of the constant current output chip PWM3, a pin of the constant current output chip VGG is electrically connected to a first end of a capacitor C15, a second end of a capacitor C15 is electrically connected to ground, a pin of the constant current output chip G1 is electrically connected to a base of a transistor M5, an emitter of the transistor M5 is electrically connected to a second end of a capacitor C5, a first end of an inductor L5, a pin of the constant current output chip LX1 and a negative electrode of a diode D5, a first end of a capacitor C5 is electrically connected to a pin of the constant current output chip BS1, a positive electrode of a diode D5 is electrically connected to ground, a second end of an inductor L5 is electrically connected to a pin of the constant current output chip RH1 and a first end of a resistor R5, a second end of a resistor R5 is electrically connected to a pin of the constant current output chip RL1, a first end of a capacitor C12 is electrically connected to a positive electrode of a light emitting diode D9, a second end of the capacitor C12 is electrically connected to ground, a negative electrode of the light emitting diode D12 is electrically connected to a positive electrode of the light emitting diode D12, the cathode of the light emitting diode D11 is electrically connected with ground, the pin of the constant current output chip G2 is electrically connected with the base of the transistor M6, the emitter of the transistor M6 is electrically connected with the second end of the capacitor C6, the first end of the inductor L6, the pin of the constant current output chip LX2 and the cathode of the diode D6, the first end of the capacitor C6 is electrically connected with the pin of the constant current output chip BS2, the anode of the diode D6 is electrically connected with ground, the second end of the inductor L6 is electrically connected with the pin of the constant current output chip RH2 and the first end of the resistor R6, the second end of the resistor R6 is electrically connected with the pin of the constant current output chip RL2, the first end of the capacitor C13 and the anode of the light emitting diode D12, the second end of the capacitor C13 is electrically connected with ground, the cathode of the light emitting diode D12 is electrically connected with the anode of the light emitting diode D13, the cathode of the light emitting diode D13 is electrically connected with the anode of the light emitting diode D14, the cathode of the light emitting diode D14 is electrically connected with ground, the base of the constant current output chip G3 is electrically connected with the base of the transistor M7, an emitter of the transistor M7 is electrically connected with a second end of the capacitor C7, a first end of the inductor L7, a pin of the constant current output chip LX3 and a cathode of the diode D7, a first end of the capacitor C7 is electrically connected with a pin BS3 of the constant current output chip, an anode of the diode D7 is electrically connected with the ground, a second end of the inductor L7 is electrically connected with a pin RH3 of the constant current output chip and a first end of the resistor R7, a second end of the resistor R7 is electrically connected with a pin RL3 of the constant current output chip, a first end of the capacitor C14 is electrically connected with an anode of the light emitting diode D15, a second end of the capacitor C14 is electrically connected with the ground, a cathode of the light emitting diode D15 is electrically connected with an anode of the light emitting diode D16, a cathode of the light emitting diode D16 is electrically connected with an anode of the light emitting diode D17, and a cathode of the light emitting diode D17 is electrically connected with the ground.
Through the circuit connection, the voltage at two ends of the LED string is automatically detected and adjusted in a self-adaptive mode on the premise of not influencing the performance of the LED car lamp, so that the energy consumption of the LED car lamp is reduced, and the energy efficiency of the LED car lamp is improved.
The working principle is as follows: determining rated voltages of two ends of an LED string, and determining the output voltage of constant voltage driving according to the fact that the output voltage of the constant voltage driving is more than 20% higher than the actually required voltage of the two ends of the LED; when power-on initialization is carried out, the output voltage of the boost integrated circuit is set according to the output voltage driven by the constant voltage to realize constant voltage output, the output current of the buck integrated circuit is set according to the current requirement of the LED string to realize constant current output, and the LED is lightened after the setting; then, the voltage reduction integrated circuit automatically detects the voltage actually needed by two ends of the LED string through the internal negative voltage detection function; automatically resetting the output voltage of the boosting integrated circuit in an operating state according to the actually required voltage at the two ends of the LED string; the output voltage newly set at this time is lower than the output voltage set during power-on initialization, so that the output power is reduced, namely, the actually consumed energy amount is reduced, the power consumption is reduced, and the energy efficiency is improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. A method for realizing LED voltage self-adaption based on a voltage boosting and reducing integrated circuit is characterized by comprising the following steps: the method for realizing the LED voltage self-adaption based on the voltage boosting and reducing integrated circuit comprises five steps, namely: determining rated voltages at two ends of the LED string, and then determining output voltage of constant voltage drive; the second step is that: when power-on initialization is carried out, the output voltage of the boost integrated circuit is set according to the output voltage driven by the constant voltage so as to realize constant voltage output; the third step: setting the output current of the voltage-reducing integrated circuit according to the current requirement of the LED string to realize constant current output; the fourth step: the voltage reduction integrated circuit automatically detects the voltage actually required by two ends of the LED string; the fifth step: automatically resetting the output voltage of the boost integrated circuit in an operating state according to the actually required voltage at the two ends of the LED string;
the circuit elements for realizing the LED voltage self-adaption comprise a boost conversion chip, a constant current output chip, a microcontroller, a bus transceiver, a diode D1, a diode D2, a diode D5, a diode D6, a diode D7, a diode D8, a capacitor C1, a capacitor C2, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, an inductor L8, a resistor R8, a transistor M8, a light emitting diode D8, a light emitting diode D emitting diode 8, a light emitting diode D emitting diode 8, a light emitting diode D8, a light emitting diode D8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D, a light emitting diode 8, a light emitting diode D8, a light emitting diode D, a light emitting diode 8, a light emitting diode D;
the boost conversion chip is electrically connected with a circuit, the anode of the diode D8 is electrically connected with a power supply, the cathode of the diode D8 is electrically connected with the first end of a capacitor C1, the first end of a capacitor C2, the first end of an inductor L1, the first end of an inductor L2, a VBAT pin of the boost conversion chip, the first end of a capacitor C18, a VBAT pin of a bus transceiver and the first end of a capacitor C19, the first end of a capacitor C16 is electrically connected with a VGG pin of the boost conversion chip, the second end of the capacitor C16 is electrically connected with ground, the second end of a capacitor C18 is electrically connected with ground, the VCC pin of the boost conversion chip is electrically connected with a VCC pin of a constant current output chip, a VCC pin of the bus transceiver, a VCC pin of a microcontroller and the first end of a capacitor C20, the second end of the capacitor C20 is electrically connected with ground, the EN pin of the boost conversion chip is electrically connected with a pin of a microcontroller EN-1, the CSB pin of the boost conversion chip is electrically connected with a pin of the CSB1, the boost conversion chip SDI pin is electrically connected with the microcontroller SDI pin and the constant current output chip SDI pin, the boost conversion chip SDO pin is electrically connected with the microcontroller SDO pin and the constant current output chip SDO pin, the boost conversion chip SCLK pin is electrically connected with the microcontroller SCLK pin and the constant current output chip SCLK pin, the boost conversion chip GND pin is electrically connected with the ground, the boost conversion chip G1 pin is electrically connected with the base of the transistor M1, the collector of the transistor M1 is electrically connected with the second end of the inductor L1 and the anode of the diode D1, the emitter of the transistor M1 is electrically connected with the boost conversion chip SNH1 pin and the first end of the resistor R1, the second end of the resistor R1 is electrically connected with the pin of the boost conversion chip SNL1 and the ground, the cathode of the diode D1 is electrically connected with the first end of the capacitor C8, the cathode of the diode D2, the first end of the capacitor C9, the cathode of the diode D2, The boost conversion chip FB1 pin, the boost conversion chip FB2 pin, the constant current output chip VIN pin, the collector of the transistor M5, the collector of the transistor M6 and the collector of the transistor M7 are electrically connected, the second end of the capacitor C8 is electrically connected with the ground, the second end of the capacitor C9 is electrically connected with the ground, the second end of the inductor L2 is electrically connected with the collector of the transistor M2 and the anode of the diode D2, the base of the transistor M2 is electrically connected with the boost conversion chip G2 pin, the emitter of the transistor M2 is electrically connected with the boost conversion chip SNH2 pin and the first end of the resistor R2, and the second end of the resistor R2 is electrically connected with the SNL2 and the ground.
2. The method of claim 1 for implementing LED voltage adaptation based on boost and buck integrated circuits, wherein: the output constant voltage is realized by a boost conversion chip, the output constant current is realized by a constant current output chip, the voltage actually required for detecting the two ends of the LED string is realized by the internal load voltage detection function of the buck integrated circuit, the output voltage of the boost integrated circuit is automatically reset according to the actually required voltage of the two ends of the LED string is realized by a microcontroller, and the data communication processing is realized by a bus transceiver.
3. The method of claim 1 for implementing LED voltage adaptation based on boost and buck integrated circuits, wherein: the bus transceiver circuit connection is as follows: the second end of the capacitor C19 is electrically connected with a GND pin and the ground of a bus transceiver, an LIN pin of the bus transceiver is electrically connected with an LIN bus, an RSTN pin of the bus transceiver is electrically connected with an RSTN pin of a microcontroller, an EN pin of the bus transceiver is electrically connected with an EN pin of the microcontroller, a TXD pin of the bus transceiver is electrically connected with a TXD pin of the microcontroller, an RXD pin of the bus transceiver is electrically connected with an RXD pin of the microcontroller, and a GND pin of the microcontroller is electrically connected with the ground.
4. The method of claim 1 for implementing LED voltage adaptation based on boost and buck integrated circuits, wherein: the circuit connection of the microcontroller is as follows: the pin EN-2 of the microcontroller is electrically connected with the pin EN of the constant current output chip, the pin CSB2 of the microcontroller is electrically connected with the pin CSB of the constant current output chip, the pin SDI of the microcontroller is electrically connected with the pin SDI of the constant current output chip, the pin SDO of the microcontroller is electrically connected with the pin SDO of the constant current output chip, the pin PWM1 of the microcontroller is electrically connected with the pin PWM1 of the constant current output chip, the pin PWM2 of the microcontroller is electrically connected with the pin PWM2 of the constant current output chip, and the pin PWM3 of the microcontroller is electrically connected with the pin PWM3 of the constant current output chip.
5. The method of claim 1 for implementing LED voltage adaptation based on boost and buck integrated circuits, wherein: the circuit connection of the constant current output chip is as follows: the pin of the constant current output chip VGG is electrically connected with a first end of a capacitor C15, a second end of the capacitor C15 is electrically connected with the ground, the pin of the constant current output chip G1 is electrically connected with the base of a transistor M5, the emitter of the transistor M5 is electrically connected with a second end of a capacitor C5, a first end of an inductor L5, a pin of the constant current output chip LX1 and the cathode of a diode D5, the first end of a capacitor C5 is electrically connected with a pin of the constant current output chip BS1, the anode of a diode D5 is electrically connected with the ground, the second end of the inductor L5 is electrically connected with a pin of the constant current output chip RH1 and a first end of a resistor R5, the second end of the resistor R5 is electrically connected with a pin of the constant current output chip RL1, a first end of the capacitor C12 and the anode of a light emitting diode D9, the second end of the capacitor C12 is electrically connected with the ground, the cathode of the light emitting diode D9 is electrically connected with the anode of the light emitting diode D10, and the cathode of the light emitting diode D10 is electrically connected with the anode of the light emitting diode 11, the cathode of the light emitting diode D11 is electrically connected with the ground, the pin G2 of the constant current output chip is electrically connected with the base of the transistor M6, the emitter of the transistor M6 is electrically connected with the second end of the capacitor C6, the first end of the inductor L6, the pin LX2 of the constant current output chip and the cathode of the diode D6, the first end of the capacitor C6 is electrically connected with the pin BS2 of the constant current output chip, the anode of the diode D6 is electrically connected with the ground, the second end of the inductor L6 is electrically connected with the pin RH2 of the constant current output chip and the first end of the resistor R6, the second end of the resistor R6 is electrically connected with the pin RL2 of the constant current output chip, the first end of the capacitor C13 and the anode of the light emitting diode D12, the second end of the capacitor C13 is electrically connected with the ground, the cathode of the light emitting diode D12 is electrically connected with the anode of the light emitting diode D13, the cathode of the light emitting diode D13 is electrically connected with the anode of the light emitting diode D14, and the cathode of the light emitting diode D14 is electrically connected with the ground, the pin of the constant current output chip G3 is electrically connected with the base of a transistor M7, the emitter of the transistor M7 is electrically connected with the second end of a capacitor C7, the first end of an inductor L7, the pin of the constant current output chip LX3 and the cathode of a diode D7, the first end of the capacitor C7 is electrically connected with the pin of the constant current output chip BS3, the anode of a diode D7 is electrically connected with the ground, the second end of the inductor L7 is electrically connected with the pin of the constant current output chip RH3 and the first end of a resistor R7, the second end of the resistor R7 is electrically connected with the pin of the constant current output chip RL3, the first end of a capacitor C14 and the anode of a light emitting diode D15, the second end of the capacitor C14 is electrically connected with the ground, the cathode of the light emitting diode D15 is electrically connected with the anode of a light emitting diode D16, the cathode of the light emitting diode D16 is electrically connected with the anode of the light emitting diode D17, and the cathode of the light emitting diode D17 is electrically connected with the ground.
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| CN102186288A (en) * | 2011-04-08 | 2011-09-14 | 深圳市中庆微科技开发有限公司 | Intelligent LED (Light Emitting Diode) driving chip |
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| CN104661399B (en) * | 2014-09-03 | 2017-08-29 | 常州东村电子有限公司 | A kind of constant current driver circuit for LED based on DC/DC voltage raising and reducings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102186288A (en) * | 2011-04-08 | 2011-09-14 | 深圳市中庆微科技开发有限公司 | Intelligent LED (Light Emitting Diode) driving chip |
| CN202818699U (en) * | 2012-08-16 | 2013-03-20 | 重庆雷本光电科技有限公司 | LED automotive headlamp drive circuit |
| CN103313469A (en) * | 2013-04-15 | 2013-09-18 | 浙江生辉照明有限公司 | Driving circuit and driving method for light-emitting diode (LED) illumination device |
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