High-power LED linear constant-current driving control chip

Abstract

The invention discloses a high-power LED linear constant-current driving control chip, which comprises a memory, a reading module, a driving module, a constant-current control module, a wire net detection module, a constant-power control module, a power supply management module and a starting reset module, and is characterized in that the constant-current control module, the wire net detection module, the constant-power control module, the power supply management module and the starting reset module are connected through a plurality of types of function configuration data pre-stored in the memory; corresponding control signals can be directly generated for different types of external trigger signals when equipment is replaced, so that LED control on different equipment is realized; meanwhile, output voltage output to the constant-current control module can be adjusted through the constant-power control module according to the sampling voltage, then output current of the constant-current control module can be adjusted, and finally the effect that the input voltage is changed while the input power is not changed is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of LED control chips, in particular to a high-power LED linear constant current drive control chip. Background Art

[0002] With the development of society, LED technology has also developed rapidly. LED has been widely used in many fields such as lighting, display and decoration. LED is a diode that can convert electrical energy into light energy. Its essence is PN junction, which has unidirectional conductivity. After conduction, a small voltage fluctuation will bring a large current fluctuation, which will cause the output brightness of the LED to change. Therefore, controlling the LED requires controlling the constant current. In the LED lighting system, the driver control chip can convert the input voltage under various power supply conditions into the current required for the LED to emit light, and is an important part of the entire lighting system. Poor performance LED driver control chips not only affect the life and reliability of the lighting system, but also reduce the efficiency of the system and cause additional power loss.

[0003] However, the existing control chip cannot control the LEDs of different devices and cannot be widely used in devices with different needs. Therefore, we propose a high-power LED linear constant current drive control chip to solve the above-mentioned problems. Summary of the invention

[0004] The purpose of the present invention is to provide a high-power LED linear constant current drive control chip to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-power LED linear constant current drive control chip, used to control the switching on and off of each channel in a multi-channel LED, including a memory, a reading module, a driving module, a constant current control module, a wire network detection module, a constant power control module, a power management module, and a startup reset module, wherein the memory is connected to the reading module, the reading module is connected to the driving module, the driving module is connected to the constant current control module, the constant current control module is connected to the wire network detection module, the wire network detection module is connected to the constant power control module, the constant power control module is connected to the power management module, and the power management module is connected to the startup reset module;

[0007] The memory stores two or more types of function configuration data;

[0008] The reading module reads all types of functional configuration data from the memory to automatically change the logic state of the memory to generate a control signal, and outputs it to the driving module;

[0009] The driving module switches and controls the operation mode of the LED under the action of the control signal;

[0010] The constant current control module is used to be connected in series with the LED load;

[0011] The line network detection module is used to sample the line network input voltage and output the sampled voltage, and output the clamping voltage when the sampled voltage reaches the clamping voltage;

[0012] The constant power control module is used to adjust the output voltage output to the constant current control module according to the sampled voltage, so as to adjust the output current of the constant current control module so that the input power of the LED load remains constant, and to control the minimum output voltage output to the constant current control module through the clamping voltage so that the output current of the constant current control module is the minimum holding current of the thyristor;

[0013] The power management module is used to ensure that the power supply is turned off when all zero data or no data is input by analyzing the status of the previous data and the next data in the power management signal;

[0014] The startup reset module is used to generate a reset signal after the system is powered on, and transmit the reset signal to the oscillator circuit, the bias current circuit and the digital circuit to ensure that all circuits are started synchronously and complete the operation of entering a stable working state.

[0015] As a further solution of the present invention: each type of function configuration data includes a brightness function, a flashing function and a flashing for help function, and the brightness function includes a linear dimming function and a fixed brightness function.

[0016] As a further solution of the present invention: the line network detection module includes a voltage divider circuit and a clamping circuit, the voltage divider circuit is used to perform voltage division sampling on the line network input voltage and generate a sampling voltage; the clamping circuit is used to output a clamping voltage when the sampling voltage reaches the clamping voltage, and the clamping voltage is the sampling voltage corresponding to the line network input voltage when the current of the line network is the minimum holding current of the thyristor.

[0017] As a further solution of the present invention: the clamping circuit includes a Zener diode, the voltage divider circuit includes a first resistor and a second resistor, the first end of the first resistor serves as the power input end of the driving circuit to receive the line network input voltage, and the second end of the first resistor is simultaneously connected to the negative electrode of the Zener diode, the first end of the second resistor and the constant power control module.

[0018] As a further solution of the present invention: the anode of the Zener diode and the second end of the second resistor are grounded at the same time.

[0019] As a further solution of the present invention: the constant power control module includes a voltage detection circuit and a voltage comparison circuit; the voltage detection circuit is used to detect the sampling voltage; the voltage comparison circuit uses the constant current reference voltage as the output voltage when the sampling voltage is less than the constant current reference voltage, and when the sampling voltage is greater than the constant current reference voltage, the output voltage decreases as the sampling voltage increases, and when the sampling voltage is a clamping voltage, the output voltage is the minimum output voltage.

[0020] As a further solution of the present invention: the voltage detection circuit includes a first operational amplifier and a switch tube; the voltage comparison circuit includes a third resistor, a fourth resistor and a second operational amplifier.

[0021] As a further solution of the present invention: the constant current control module uses an operational amplifier in conjunction with a MOS power tube to provide a constant current for the LED.

[0022] As a further solution of the present invention: the power management module specifically refers to the mutual cooperation of combined logic gates and triggers to achieve the transmission of reset signals, logic control and the generation of final enable signals, and to control the switching states of multiple groups of circuits of the configuration current circuit and oscillator circuit of the entire system by analyzing the serial input data DIN.

[0023] As a further solution of the present invention: the startup reset module includes an analog reset circuit and a digital reset circuit. The analog reset circuit is used to output an analog reset signal to achieve system reset control; the digital reset circuit is used to output a digital reset signal to achieve a delay, ensuring reliable output of the reset signal to achieve system reset control.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The high-power LED linear constant current drive control chip includes a memory, a reading module, and a driving module. Through the pre-stored various types of functional configuration data in the memory, the chip can directly generate corresponding control signals for different types of external trigger signals when the device is replaced, thereby realizing LED control of different devices; at the same time, the constant power control module can adjust the output voltage output to the constant current control module according to the sampling voltage, thereby adjusting the output current of the constant current control module, and finally achieving the effect of changing the input voltage while keeping the input power unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the internal structure of the high-power LED linear constant current drive control chip of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the high-power LED linear constant current drive control chip of the present invention. DETAILED DESCRIPTION

[0028] In one embodiment, Figure 1-Figure 2 As shown, a high-power LED linear constant current drive control chip is used to control the switching on and off of each channel in a multi-channel LED, including a memory, a reading module, a driving module, a constant current control module, a wire network detection module, a constant power control module, a power management module, and a startup reset module. The memory is connected to the reading module, the reading module is connected to the driving module, the driving module is connected to the constant current control module, the constant current control module is connected to the wire network detection module, the wire network detection module is connected to the constant power control module, the constant power control module is connected to the power management module, and the power management module is connected to the startup reset module;

[0029] A memory for storing two or more types of functional configuration data;

[0030] A reading module reads all types of functional configuration data from the memory, automatically changes the logic state of the memory to generate a control signal, and outputs it to the driving module;

[0031] The driving module switches the operation mode of the control LED under the action of the control signal;

[0032] Constant current control module, used to be connected in series with the LED load;

[0033] A line network detection module, used to sample the line network input voltage and output the sampled voltage, and output the clamping voltage when the sampled voltage reaches the clamping voltage;

[0034] A constant power control module, used to adjust the output voltage output to the constant current control module according to the sampled voltage, so as to adjust the output current of the constant current control module so that the input power of the LED load remains constant, and to control the minimum output voltage output to the constant current control module through the clamping voltage so that the output current of the constant current control module is the minimum holding current of the thyristor;

[0035] A power management module, used for ensuring that the power supply is turned off when all zero data or no data is input by analyzing the status of the previous data and the next data in the power management signal;

[0036] The startup reset module is used to generate a reset signal after the system is powered on, and transmit the reset signal to the oscillator circuit, bias current circuit and digital circuit to ensure that all circuits are started synchronously and enter a stable working state;

[0037] Each type of function configuration data includes a brightness function, a flashing function, and a flashing function for emergency, and the brightness function includes a linear dimming function and a fixed brightness function;

[0038] The line network detection module includes a voltage divider circuit and a clamp circuit. The voltage divider circuit is used to divide and sample the line network input voltage and generate a sampling voltage. The clamp circuit is used to output a clamp voltage when the sampling voltage reaches the clamp voltage. The clamp voltage is the sampling voltage corresponding to the line network input voltage when the line network current is the minimum holding current of the thyristor.

[0039] The clamping circuit includes a Zener diode, the voltage divider circuit includes a first resistor and a second resistor, the first end of the first resistor serves as a power input end of the driving circuit to receive a line network input voltage, and the second end of the first resistor is simultaneously connected to the cathode of the Zener diode, the first end of the second resistor and the constant power control module;

[0040] The anode of the Zener diode and the second end of the second resistor are grounded at the same time;

[0041] The constant power control module includes a voltage detection circuit and a voltage comparison circuit; the voltage detection circuit is used to detect the sampling voltage; the voltage comparison circuit uses the constant current reference voltage as the output voltage when the sampling voltage is less than the constant current reference voltage, and when the sampling voltage is greater than the constant current reference voltage, the output voltage decreases as the sampling voltage increases, and when the sampling voltage is the clamping voltage, the output voltage is the minimum output voltage;

[0042] The voltage detection circuit includes a first operational amplifier and a switch tube; the voltage comparison circuit includes a third resistor, a fourth resistor and a second operational amplifier;

[0043] The constant current control module uses an operational amplifier and a MOS power tube to provide a constant current for the LED.

[0044] The power management module specifically refers to the combination of logic gates and triggers to achieve the transmission of reset signals, logic control and the generation of final enable signals, and to control the switch states of multiple groups of circuits including the configuration current circuit and oscillator circuit of the entire system by analyzing the serial input data DIN;

[0045] The power management module analyzes the input data to determine whether there is a valid working demand. When the input data is all zero, the system determines it as an invalid state, and the power consumption module enters the sleep mode; when valid data is detected, the system immediately wakes up the relevant circuit to resume normal operation. The power management signal POWER_EN is determined by the state of the previous data and the next data, ensuring that the power consumption circuit is turned on only when needed, thereby reducing unnecessary energy consumption, especially when the power consumption circuit is turned off when all zero data or no data is input. Through the combination of NAND gates, inverters and triggers, the automatic enabling and disabling of analog circuits such as current bias and OSC is realized, thereby improving the power efficiency of the system. This dynamic control mechanism based on data status enables the circuit to respond quickly to actual working needs while reducing energy consumption, ensuring that system performance is not affected. This power management mechanism significantly reduces the energy consumption of the chip when the LED is not emitting light, thereby greatly improving the efficiency and practicality of the overall system.

[0046] The startup reset module includes an analog reset circuit and a digital reset circuit. The analog reset circuit is used to output an analog reset signal to achieve system reset control; the digital reset circuit is used to output a digital reset signal to achieve a delay, ensuring reliable reset signal output to achieve system reset control.

[0047] The test method of the control chip comprises: inputting any 24×N-bit data into the data input terminal of the first LED driver chip to be tested, the previous LED driver chip to be tested processes the first 24 bits of data and latches them, and the remaining data is shaped and transmitted to the data input terminal of the next cascaded LED driver chip to be tested through the data output terminal; real-time monitoring of the waveform through the data output terminal of each LED driver chip to be tested; if the data input terminal of each LED driver chip to be tested receives the first 24 bits of data, the corresponding data output terminal keeps the output at a low level, and determines that the latch function is normal; if the data input terminal of each LED driver chip to be tested receives data other than the first 24 bits, the corresponding data output terminal synchronously outputs the data other than the first 24 bits, and determines that the output function is normal.

[0048] The present invention includes a memory, a reading module, and a driving module. Through the pre-stored various types of functional configuration data in the memory, it is possible to directly generate corresponding control signals for different types of external trigger signals when replacing the device, thereby realizing LED control of different devices; at the same time, the constant power control module can adjust the output voltage output to the constant current control module according to the sampling voltage, thereby adjusting the output current of the constant current control module, and finally achieving the effect of changing the input voltage while keeping the input power unchanged.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-power LED linear constant current drive control chip, used to control the switching on and off of each channel in a multi-channel LED, characterized in that: It includes a memory, a reading module, a driving module, a constant current control module, a wire network detection module, a constant power control module, a power management module, and a startup reset module, wherein the memory is connected to the reading module, the reading module is connected to the driving module, the driving module is connected to the constant current control module, the constant current control module is connected to the wire network detection module, the wire network detection module is connected to the constant power control module, the constant power control module is connected to the power management module, and the power management module is connected to the startup reset module; The memory stores two or more types of function configuration data; The reading module reads all types of functional configuration data from the memory to automatically change the logic state of the memory to generate a control signal, and outputs it to the driving module; The driving module switches and controls the operation mode of the LED under the action of the control signal; The constant current control module is used to be connected in series with the LED load; The line network detection module is used to sample the line network input voltage and output the sampled voltage, and output the clamping voltage when the sampled voltage reaches the clamping voltage; The constant power control module is used to adjust the output voltage output to the constant current control module according to the sampled voltage, so as to adjust the output current of the constant current control module so that the input power of the LED load remains constant, and to control the minimum output voltage output to the constant current control module through the clamping voltage so that the output current of the constant current control module is the minimum holding current of the thyristor; The power management module is used to ensure that the power supply is turned off when all zero data or no data is input by analyzing the status of the previous data and the next data in the power management signal; The startup reset module is used to generate a reset signal after the system is powered on, and transmit the reset signal to the oscillator circuit, the bias current circuit and the digital circuit to ensure that all circuits are started synchronously and complete the operation of entering a stable working state.

2. A high-power LED linear constant current drive control chip according to claim 1, characterized in that: Each type of function configuration data includes a brightness function, a flashing function, and an emergency flashing function, and the brightness function includes a linear dimming function and a fixed brightness function.

3. A high-power LED linear constant current drive control chip according to claim 1, characterized in that: The line network detection module includes a voltage divider circuit and a clamping circuit. The voltage divider circuit is used to perform voltage division sampling on the line network input voltage and generate a sampling voltage; the clamping circuit is used to output a clamping voltage when the sampling voltage reaches the clamping voltage, and the clamping voltage is the sampling voltage corresponding to the line network input voltage when the current of the line network is the minimum holding current of the thyristor.

4. A high-power LED linear constant current drive control chip according to claim 3, characterized in that: The clamping circuit includes a Zener diode, and the voltage divider circuit includes a first resistor and a second resistor. The first end of the first resistor serves as the power input end of the driving circuit to receive the line network input voltage, and the second end of the first resistor is simultaneously connected to the cathode of the Zener diode, the first end of the second resistor and the constant power control module.

5. A high-power LED linear constant current drive control chip according to claim 4, characterized in that: The anode of the Zener diode and the second end of the second resistor are grounded at the same time.

6. A high-power LED linear constant current drive control chip according to claim 1, characterized in that: The constant power control module includes a voltage detection circuit and a voltage comparison circuit; the voltage detection circuit is used to detect the sampling voltage; the voltage comparison circuit uses the constant current reference voltage as the output voltage when the sampling voltage is less than the constant current reference voltage, and when the sampling voltage is greater than the constant current reference voltage, the output voltage decreases as the sampling voltage increases, and when the sampling voltage is the clamping voltage, the output voltage is the minimum output voltage.

7. A high-power LED linear constant current drive control chip according to claim 6, characterized in that: The voltage detection circuit includes a first operational amplifier and a switch tube; the voltage comparison circuit includes a third resistor, a fourth resistor and a second operational amplifier.

8. The high-power LED linear constant current drive control chip according to claim 1, characterized in that: The constant current control module uses an operational amplifier in conjunction with a MOS power tube to provide a constant current for the LED.

9. A high-power LED linear constant current drive control chip according to claim 1, characterized in that: The power management module specifically refers to the combination of logic gates and triggers to achieve the transmission of reset signals, logic control and the generation of final enable signals, and to control the switching states of multiple groups of circuits including the configuration current circuit and oscillator circuit of the entire system by analyzing the serial input data DIN.

10. A high-power LED linear constant current drive control chip according to claim 1, characterized in that: The startup reset module includes an analog reset circuit and a digital reset circuit. The analog reset circuit is used to output an analog reset signal to achieve system reset control; the digital reset circuit is used to output a digital reset signal to achieve a delay, ensure reliable reset signal output, and achieve system reset control.

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