CN109168230B - LED drive control device and method using voltage pulse - Google Patents

Abstract

The invention discloses a kind of LED drive dynamic control device and method using voltage pulse, drive dynamic control device includes four single-chip microcontroller master control borad, reference circuit, comparison amplifier circuit and digital information parser circuitry parts.Data controlling signal is stored in single-chip microcontroller master control borad with voltage pulse pattern, it is output in reference circuit after connecting external power and obtains a reference voltage value and voltage pulse partial pressure and be input in comparison amplifier circuit to be compared, obtained output voltage pulse input parse simultaneously output driving LED light into digital information parser circuitry.Power supply signal and data controlling signal are combined into one by the present invention using voltage pulse, reduce the complexity of chip design, the complexity of periphery circuit design, and reduce the cost of laying out pattern design, are convenient for the later period integrated and cascade to use.

Description

LED drive control device and method using voltage pulse

technical field

The invention belongs to the technical field of electronics, and further relates to a light emitting diode (Light Emitting Diode) drive control device and method using voltage pulses in the technical field of electronic devices. The LED drive control circuit of the present invention can be used in the design of a digital-analog hybrid circuit to drive an LED device.

Background technique

In decorative lighting LED drive control circuits, digital-analog hybrid circuit design LED drive control circuits have a wide range of applications, such as controlling LED light strings by using digital control logic signals. In the traditional LED drive circuit, the power signal and the digital control data signal are respectively input by two channels. The design of this drive control circuit is simple, and the power signal is directly provided by the outside, which is used alone as the circuit power supply, while the data control signal is input from the outside to the drive control. Analytical use in the circuit.

Shanghai Jingfeng Mingyuan Semiconductor Co., Ltd. discloses a driver chip, LED A driving control circuit and an LED driving method. The LED drive control circuit of this patent document includes a voltage control module for generating a VCC voltage; a reference source for generating a reference voltage relative to the CS pin of the driver chip; a sample-and-hold circuit for outputting a constant voltage ; A comparator for comparing the output of the sampling and holding circuit with the source of a MOS tube; a control logic module for circuit control and a zero-crossing detection module for detecting the DRAIN pin of the driving chip and the drain of the MOS tube, This circuit realizes LED constant current drive control. However, the disadvantage of this circuit is that the circuit design is realized through an independent voltage control module and a circuit control logic module, which makes the circuit structure more complicated. In the LED driving method of this patent document, the VCC pin of the driver chip is connected to an external power supply, the control logic module sends a turn-on signal to the MOS tube, and the control logic module sends a turn-off signal to the switch, so that the MOS tube is turned on and the switch is turned off. . The disadvantage of this method is that the control logic module used for circuit control needs an external input, and the on-signal and off-signal are used separately, which increases the cost of circuit design.

Guangzhou Dasen Lighting Co., Ltd. discloses an LED drive power circuit in its patent document "A LED drive power circuit" (application number: 201511034938.6 authorized announcement number: CN105657891 B). The LED driving power supply circuit of this patent document mainly includes a power supply module, a control module, a driving module and a light emitting module which are sequentially connected to an external alternating current, wherein the power supply module provides a DC working voltage to the control module, the driving module and the light emitting module. This invention provides a design scheme of LED driving power supply circuit, which solves the problem of single light source for agricultural lighting lamps. Through the LED constant current control IC chip on the driving circuit, the constant voltage source can be converted into a constant voltage suitable for LED lamp beads. The current source can prolong the life of the LED lamp bead, but the disadvantage of this patented technology is that an independent power module and control module are also required to drive the entire LED driving power circuit, which makes the circuit structure more complicated.

Shenzhen Ocean King Lighting Engineering Co., Ltd. discloses an LED drive circuit in its patent document "LED drive circuit" (application number: 201310076659.0 authorized announcement number: CN104053267 B). The patented technology mainly includes a power supply unit for outputting a stable voltage; a micro-control unit for setting a delay time and performing delay control; a relay; for controlling the on-off of the relay according to the output signal of the micro-control circuit A switch circuit; a voltage divider circuit connected to the relay and the power supply unit; an LED load connected to the LED driver chip circuit. In this invention, after the delay time set by the microcontroller unit, although the LED produces light decay, the LED appears to have no light decay through the control of the microcontroller unit, the relay, and the switch circuit, and realizes that the LED has no light decay. Light attenuation, however, the disadvantage of this patented technology is that an independent power supply unit and microcontroller unit are required, which makes the circuit structure more complicated.

Contents of the invention

The object of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide an LED drive control device and method using voltage pulses.

The specific idea of realizing the object of the present invention is that the control signal is output to the LED drive control circuit in the form of voltage pulse by using the single-chip main control board, which not only can reduce one input, but also has a simple circuit structure.

The device of the present invention comprises a reference circuit, a comparative amplifier circuit, a main control board of a single-chip microcomputer, and a digital information analysis circuit; the input terminal of the main control board of the single-chip microcomputer is connected to an external power supply, and the output terminal is respectively connected to the input terminal of the reference circuit and the first part of the comparative amplifier circuit. An input terminal is connected to the input terminal of the digital information analysis circuit; the output terminal of the reference circuit is connected to the second input terminal of the comparative amplifier circuit; the output terminal of the comparative amplifier circuit is connected to the input terminal of the digital information analysis circuit; wherein ,

The single-chip main control board is used to construct a voltage pulse composed of two voltage values with different amplitudes, high and low, and simultaneously output the voltage pulse to the reference circuit, the comparison amplifier circuit, and the digital information analysis circuit;

The reference circuit is used to provide a bias voltage for the reference circuit through the voltages of the first output terminal and the second output terminal of the self-starting circuit part, trigger the reference circuit to work, and the reference circuit can satisfy the input of 3V and 5V through the power supply suppression relatively high Output stable cascode structure amplifier circuit when power supply, output the input voltage pulse as a relatively stable reference voltage value between the voltage pulses divided by the voltage dividing resistor, and input the reference voltage value to the comparison amplifier a second input terminal of the circuit;

The comparative amplifier circuit is used to divide the voltage pulse output by the main control board of the single-chip microcomputer into pulse voltages on both sides of the reference voltage value output by the reference circuit, and input it to the first input terminal of the comparative amplifier circuit, The reference circuit inputs the output reference voltage value to the second input terminal of the comparative amplifier circuit, and performs comparison through the comparative amplifier circuit, if the voltage value of the second input terminal of the comparative amplifier circuit is greater than the voltage value of the first input terminal of the comparative amplifier circuit, The output is the high voltage value in the voltage pulse. If the voltage value of the second input terminal of the comparative amplifier circuit is less than the voltage value of the first input terminal of the comparative amplifier circuit, the output is a digital ground potential, and the output voltage pulse of the comparative amplifier is a digital information analysis circuit. Recognizable voltage pulses;

The digital information analysis circuit is used to input the voltage pulse output by the comparative amplifier circuit into the digital information analysis circuit, and the counter in the digital information analysis circuit compares the high voltage value and the low voltage value within a voltage pulse cycle time length Counting, the number of high voltage values is greater than the number of low voltage values in a voltage pulse cycle, the output is a high voltage value, and the LED light is turned on, the count of high voltage values is less than the count of low voltage values in a cycle, and the output is power ground, The drive LED light is off.

The concrete steps of the inventive method comprise as follows:

(1) Build a voltage pulse:

(1a) Voltage pulses are composed of two voltage values with different amplitudes, high and low, and the duration of maintaining the high voltage value and the duration of maintaining the low voltage value form a voltage pulse cycle. According to the following formula, the MCU main control board calculates the high voltage value Duty cycle within one voltage pulse period:

Among them, _q1 represents the duty ratio of the high voltage value in a voltage pulse cycle, τ represents the time length occupied by the high voltage value in the voltage pulse cycle, and T represents the time length of the voltage pulse cycle.

(1b) Use the value of 1-q ₁ to represent the duty cycle of the low voltage value in a voltage pulse period.

(1c) The main control board of the single-chip microcomputer expresses the voltage pulse when the duty cycle of the high voltage value in a voltage pulse cycle is greater than the duty cycle of the low voltage value in a voltage pulse cycle as a binary "1". The control board expresses the duty ratio of the high voltage value within one voltage pulse period as a binary "0" when the voltage pulse is smaller than the duty ratio of the low voltage value within one voltage pulse period.

(1d) The main control board of the single-chip microcomputer stores the voltage pulse composed of two voltage values with different amplitudes, high and low, in the memory of the main control board of the single-chip microcomputer in binary form.

(2) Output voltage pulse:

(2a) Connect the main control board of the single-chip microcomputer to the external power supply, the main control board of the single-chip microcomputer outputs a voltage pulse, and the voltage pulse starts the self-starting circuit in the reference circuit, and the voltage through the first output terminal and the second output terminal of the self-starting circuit is the reference circuit The bias voltage is provided to trigger the reference circuit to start working. The reference circuit outputs the input voltage pulse as a voltage dividing resistor through a cascode structure amplifier circuit with a relatively high power supply rejection and a stable output when inputting 3V and 5V power supplies. The relatively stable reference voltage value between the divided voltage pulses is input to the second input end of the comparison amplifier circuit.

(2b) The voltage pulse output by the main control board of the single-chip microcomputer is divided into pulse voltages on both sides of the reference voltage value output by the reference circuit with a voltage dividing resistor, and input to the first input terminal of the comparative amplifier circuit, and the reference voltage output by the reference circuit The value is input to the second input terminal in the comparative amplifier circuit, and compared by the comparative amplifier circuit, if the voltage value of the second input terminal of the comparative amplifier circuit is greater than the voltage value of the first input terminal of the comparative amplifier circuit, the output is a high voltage pulse Voltage value, if the voltage value of the second input terminal of the comparative amplifier circuit is smaller than the voltage value of the first input terminal of the comparative amplifier circuit, the output is a digital ground potential, and the output voltage pulse obtained at this time is a voltage pulse that can be recognized by the digital information analysis circuit.

(3) Analyze the voltage pulse:

The voltage pulse output by the comparative amplifier circuit is input to the digital information analysis circuit, and the counter in the digital information analysis circuit counts the high voltage value and the low voltage value within one voltage pulse cycle time length, and the high voltage value within one voltage pulse cycle The number of values is greater than the number of low voltage values, the output is a high voltage value, and the LED light is turned on. In one cycle, the count of the high voltage value is less than the count of the low voltage value, and the output is the power ground, and the LED light is turned off.

Compared with prior art, the present invention has following advantage:

First, because the device of the present invention adopts the single-chip main control board to store the control information in the form of voltage pulses, and simultaneously inputs the voltage pulses into the reference circuit, the comparison amplifier circuit, and the digital information analysis circuit, compared with other chip designs, the present invention The circuit device for controlling data input is reduced, and the disadvantage in the prior art that control data requires additional module input is relatively complicated, so that the LED driving control circuit of the present invention can reduce the complexity of design in chip design.

Second, because the method of the present invention uses the control data and the power supply voltage to share an input port, the control data is directly input into the LED drive control circuit in the form of voltage pulses through the main control board of the single-chip microcomputer, and at the same time, it can be improved by editing the voltage pulses. Realize the change of the control data, and realize the direct input to drive the LED drive control circuit through an input port, which overcomes the need for another control module in the prior art to edit and store the control data and input it into the LED drive control circuit, which leads to circuit design. The disadvantage of relatively complicated methods makes the LED drive control method using voltage pulses more concise and convenient in the present invention.

Description of drawings

Fig. 1 is the block diagram of LED drive control device adopting voltage pulse of the present invention;

Fig. 2 is the electrical schematic diagram of reference circuit of the present invention;

Fig. 3 is the electrical schematic diagram of the comparison amplifier circuit of the present invention;

Fig. 4 is a schematic diagram of voltage pulses in each module in the embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

With reference to accompanying drawing 1, the device of the present invention is further described.

The device of the present invention comprises a reference circuit, a comparative amplifier circuit, and also includes a single-chip microcomputer main control board and a digital information analysis circuit; the input terminal of the single-chip microcomputer main control board is connected to an external power supply, and the output terminal is respectively connected to the input terminal of the reference circuit and the comparison amplifier circuit. The first input end of the digital information analysis circuit is connected; the output end of the reference circuit is connected with the second input end of the comparison amplifier circuit; the output end of the comparison amplifier circuit is connected with the input end of the digital information analysis circuit . in:

The single-chip main control board is used to construct a voltage pulse composed of high and low voltage values with different amplitudes, and simultaneously output the voltage pulse to a reference circuit, a comparison amplifier circuit, and a digital information analysis circuit.

The reference circuit is used to provide a bias voltage for the reference circuit through the voltages of the first output terminal and the second output terminal of the self-starting circuit part, trigger the reference circuit to work, and the reference circuit can satisfy the input of 3V and 5V through the power supply suppression relatively high Output stable cascode structure amplifier circuit when power supply, output the input voltage pulse as a relatively stable reference voltage value between the voltage pulses divided by the voltage dividing resistor, and input the reference voltage value to the comparison amplifier the second input of the circuit.

The comparative amplifier circuit is used to divide the voltage pulse output by the main control board of the single-chip microcomputer into pulse voltages on both sides of the reference voltage value output by the reference circuit, and input it to the first input terminal of the comparative amplifier circuit, The reference circuit inputs the output reference voltage value to the second input terminal of the comparative amplifier circuit, and performs comparison through the comparative amplifier circuit, if the voltage value of the second input terminal of the comparative amplifier circuit is greater than the voltage value of the first input terminal of the comparative amplifier circuit, The output is the high voltage value in the voltage pulse. If the voltage value of the second input terminal of the comparative amplifier circuit is less than the voltage value of the first input terminal of the comparative amplifier circuit, the output is a digital ground potential, and the output voltage pulse of the comparative amplifier is a digital information analysis circuit. Recognizable voltage pulses.

The digital information analysis circuit is used to input the voltage pulse output by the comparative amplifier circuit into the digital information analysis circuit, and the counter in the digital information analysis circuit compares the high voltage value and the low voltage value within a voltage pulse cycle time length Counting, the number of high voltage values is greater than the number of low voltage values in a voltage pulse cycle, the output is a high voltage value, and the LED light is turned on, the count of high voltage values is less than the count of low voltage values in a cycle, and the output is power ground, The drive LED light is off.

Referring to Fig. 2, the reference circuit of the present invention will be further described.

The reference circuit includes a self-starting circuit part and a reference circuit part, including nine PMOS transistors, seven NMOS transistors, three voltage dividing resistors, five PNP bipolar transistors and a self-starting circuit; among them, the first PMOS transistor M1 The source of the MCU is connected to the output terminal of the main control board of the single-chip microcomputer, and the gate of the first PMOS transistor M1 is respectively connected to the drain of the second PMOS transistor M2, the drain of the first NMOS transistor M3, and the first gate of the self-starting circuit. The output terminal, the gate of the third PMOS transistor M5, the gate of the sixth PMOS transistor M12, and the gate of the eighth PMOS transistor M15 are connected, and the drain of the first PMOS transistor M1 is connected to the gate of the second PMOS transistor M2 The source of the second PMOS transistor M2 is connected to the gate of the fourth PMOS transistor M6, the gate of the fifth PMOS transistor M9, the drain of the fifth PMOS transistor M9, the fifth NMOS The drain of the tube M10, the grid of the seventh PMOS tube M13, the grid of the ninth PMOS tube M16, and the second output terminal of the self-starting circuit are connected; the grid of the first NMOS tube M3 is connected to the third The gate of the NMOS transistor M7, the gate of the fifth NMOS transistor M10, the gate of the seventh NMOS transistor M14, the drain of the seventh NMOS transistor M14, and the drain of the seventh PMOS transistor M13 are connected. The source of the first NMOS transistor M3 is connected to the drain of the second NMOS transistor M4; the gate of the second NMOS transistor M4 is respectively connected to the gate of the fourth NMOS transistor M8, the gate of the sixth NMOS transistor M11, The drain of the third NMOS transistor M7 is connected to the drain of the fourth PMOS transistor M6, and the source of the second NMOS transistor M4 is connected to one end of the first voltage dividing resistor R1; The other end is connected to the emitter of the first PNP bipolar transistor Q1; the base of the first PNP bipolar transistor Q1 and the collector of the first PNP bipolar transistor Q1 are respectively connected to the power ground; the third The source of the first PMOS transistor M5 is connected to the output terminal of the MCU main control board, the drain of the third PMOS transistor M5 is connected to the source of the fourth PMOS transistor M6; the source of the third NMOS transistor M7 is connected to the fourth The drain of the first NMOS transistor M8 is connected; the source of the fourth NMOS transistor M8 is connected to the emitter of the second PNP bipolar transistor Q2; the base of the second PNP bipolar transistor Q2 is connected to the second PNP bipolar transistor Q2 The collectors of the bipolar transistor Q2 are respectively connected to the power ground; the source of the fifth PMOS transistor M9 is connected to the output terminal of the MCU main control board; the source of the fifth NMOS transistor M10 is connected to the sixth NMOS transistor M11 The drain is connected; the source of the sixth NMOS transistor M11 is connected to the emitter of the third PNP bipolar transistor Q3; the base of the third PNP bipolar transistor Q3 is connected to the third PNP bipolar transistor Q3 The collectors of the transistors are respectively connected to the power ground; the source of the sixth PMOS transistor M12 is connected to the output terminal of the MCU main control board, and the drain of the sixth PMOS transistor M12 It is connected to the source of the seventh PMOS transistor M13; the source of the seventh NMOS transistor M14 is connected to the emitter of the fourth PNP bipolar transistor Q4; the base of the fourth PNP bipolar transistor Q4 is connected to the fourth PNP bipolar transistor Q4 The collectors of the four PNP bipolar transistors Q4 are respectively connected to the power ground; the source of the eighth PMOS transistor M15 is connected to the output terminal of the MCU main control board, and the drain of the eighth PMOS transistor M15 is connected to the ninth PMOS The source of the tube M16 is connected; the drain of the ninth PMOS tube M16 is respectively connected to one end of the second voltage dividing resistor R2 and one end of the third voltage dividing resistor R3; the other end of the second voltage dividing resistor R2 is connected to The emitter of the fifth PNP bipolar transistor Q5 is connected; the base of the fifth PNP bipolar transistor Q5 and the collector of the fifth PNP bipolar transistor Q5 are respectively connected to the power ground; the third voltage divider The other end of the resistor R3 is respectively connected to one end of the capacitor C and the gate of the second NMOS transistor M20 in the comparative amplifier circuit; the other end of the capacitor C is connected to the power ground.

Referring to accompanying drawing 3, the comparison amplifier circuit of the present invention is further described.

The comparative amplifier circuit includes three voltage divider resistors, three PMOS transistors, four NMOS transistors and a NOT gate; wherein, one end of the first voltage divider resistor R4 is connected to the output terminal of the MCU main control board, and the first voltage divider The other end of the resistor R4 is connected to one end of the second voltage dividing resistor R5; the other end of the second voltage dividing resistor R5 is respectively connected to one end of the third voltage dividing resistor R6 and the gate of the first NMOS transistor M18; The other end of the third voltage dividing resistor R6 is connected to the power ground; the source of the first PMOS transistor M17 is connected to the output terminal of the main control board of the single-chip microcomputer, and the gate of the first PMOS transistor M17 is connected to its drain and the second The gate of the first PMOS transistor M19 is connected to the drain of the first NMOS transistor M18; the source of the first NMOS transistor M18 is respectively connected to the source of the second NMOS transistor M20 and the drain of the third NMOS transistor M21 ; The source of the second PMOS transistor M19 is connected to the output terminal of the MCU main control board, and the drain of the second PMOS transistor M19 is respectively connected to the drain of the second NOMS transistor M20 and the gate of the third PMOS transistor M22 connection; the gate of the second NMOS transistor M20 is respectively connected to the other end of the third voltage dividing resistor R3 and one end of the capacitor C in the reference circuit; the gate of the third NMOS transistor M21 is connected to the gate of the fourth NMOS transistor M23 The gate is connected, the source of the third NMOS transistor M21 is connected to the power ground; the source of the third PMOS transistor M22 is connected to the output terminal of the MCU main control board, and the drain of the third PMOS transistor M22 is respectively the fourth The drain of the NMOS transistor M23 is connected to the input terminal of the invertor INV; the source of the fourth NMOS transistor M23 is connected to the power ground; the output terminal of the invertor INV is connected to the input terminal of the digital information analysis circuit.

The specific steps of the method of the present invention are further described below.

Step 1, build a voltage pulse.

The voltage pulse is composed of two voltage values with different amplitudes, high and low, and the time length for maintaining the high voltage value and the time length for maintaining the low voltage value form a voltage pulse cycle. According to the following formula, calculate the high voltage value in a voltage pulse cycle Duty cycle:

Among them, _q1 represents the duty ratio of the high voltage value in a voltage pulse cycle, τ represents the time length occupied by the high voltage value in the voltage pulse cycle, and T represents the time length of the voltage pulse cycle.

Use the value of 1-q ₁ to represent the duty cycle of the low voltage value in a voltage pulse period.

The duty ratio of the high voltage value in a voltage pulse period is greater than the duty ratio of the low voltage value in a voltage pulse period, and the voltage pulse is expressed as a binary "1", and the high voltage value in a voltage pulse period The duty cycle within the low voltage value is less than the duty cycle of the low voltage value within a voltage pulse period, and the voltage pulse is expressed as a binary "0".

The voltage pulse composed of high and low voltage values with different amplitudes is stored in the memory of the single-chip main control board in binary form.

Step 2, output voltage pulse.

Connect the main control board of the single-chip microcomputer to the external power supply, the main control board of the single-chip microcomputer outputs a voltage pulse, and the voltage pulse turns on the self-starting circuit in the reference circuit, and provides bias for the reference circuit through the voltage of the first output terminal and the second output terminal of the self-starting circuit. Set the voltage and trigger the reference circuit to start working. The reference circuit outputs the input voltage pulse as a voltage divider between the voltage divider resistor through the cascode structure amplifier circuit with a relatively high power supply suppression that can satisfy the input 3V and 5V power supply. The relatively stable reference voltage value between the subsequent voltage pulses is input to the second input terminal of the comparison amplifier circuit.

The voltage pulse output by the main control board of the single-chip microcomputer is divided into pulse voltages located on both sides of the reference voltage value output by the reference circuit with a voltage dividing resistor, and input to the first input terminal of the comparison amplifier circuit, and the reference voltage value output by the reference circuit is input to The second input terminal in the comparison amplifier circuit is compared by the comparison amplifier circuit, if the voltage value of the second input terminal of the comparison amplifier circuit is greater than the voltage value of the first input terminal of the comparison amplifier circuit, the output is a high voltage value in the voltage pulse, If the voltage value of the second input terminal of the comparative amplifier circuit is smaller than the voltage value of the first input terminal of the comparative amplifier circuit, the output is a digital ground potential, and the output voltage pulse obtained at this time is a voltage pulse that can be recognized by the digital information analysis circuit.

Step 3, analyze the voltage pulse.

The voltage pulse output by the comparative amplifier circuit is input to the digital information analysis circuit, and the counter in the digital information analysis circuit counts the high voltage value and the low voltage value within one voltage pulse cycle time length, and the high voltage value within one voltage pulse cycle The number of values is greater than the number of low voltage values, the output is a high voltage value, and the LED light is turned on. In one cycle, the count of the high voltage value is less than the count of the low voltage value, and the output is the power ground, and the LED light is turned off.

With reference to accompanying drawing 4, the effect of the present invention is described further through embodiment.

Fig. 4(a) is a schematic diagram of voltage pulses output from the main control board of the single-chip microcomputer in the embodiment of the present invention. In the specific embodiment of the present invention, the voltage pulse cycle length is 10us, wherein the duty cycle of the 5V voltage value is 60%, that is, 6us, and the duty cycle of the 3V voltage value is 40%, that is, when it is 4us, it is expressed as "1", 5V The duty cycle of the voltage value is 40%, that is, 4us. When the duty cycle of the 3V voltage value is 60%, that is, 6us, it is expressed as "0", and it is output from the MCU main control board to the reference circuit, the comparison amplifier circuit and digital information analysis. in the circuit.

Fig. 4 (b) is the schematic diagram that voltage pulse is input in the reference circuit and comparative amplifier circuit in the embodiment of the present invention, and the dotted line in Fig. 4 (b) represents the voltage curve that voltage pulse outputs after the reference circuit, and solid line represents voltage pulse The output voltage curve after resistive voltage division.

Fig. 4(c) is a schematic diagram of the voltage pulse output after the voltage pulse passes through the reference circuit and the voltage pulse output after the voltage pulse is divided by the resistor in the embodiment of the present invention and input to the comparison amplifier circuit.

Fig. 4(d) is a schematic diagram of the signal outputted from the voltage pulse output by the comparative amplifier circuit in the embodiment of the present invention and output in the digital information analysis circuit, wherein, "1" means that the 5V high voltage drives the LED to light up, and "0" means the power ground drives LED lights off.

Claims (4)

1. a kind of light-emitting diode LED drive control device that adopts voltage pulse, comprise reference circuit, comparative amplifier circuit, it is characterized in that, also comprise single-chip microcomputer main control board, digital information analysis circuit; The input terminal of described single-chip microcomputer main control board is connected external power supply, the output end is respectively connected with the input end of the reference circuit, the first input end of the comparative amplifier circuit, and the input end of the digital information analysis circuit; the output end of the reference circuit is connected with the second input end of the comparative amplifier circuit; The output terminal of the comparison amplifier circuit is connected with the input terminal of the digital information analysis circuit; wherein: The single-chip main control board is used to construct a voltage pulse composed of two voltage values with different amplitudes, high and low, and simultaneously output the voltage pulse to the reference circuit, the comparison amplifier circuit, and the digital information analysis circuit; The reference circuit is used to provide a bias voltage for the reference circuit through the voltages of the first output terminal and the second output terminal of the self-starting circuit part, trigger the reference circuit to work, and the reference circuit can satisfy the input of 3V and 5V through the power supply suppression relatively high Output stable cascode structure amplifier circuit when power supply, output the input voltage pulse as a relatively stable reference voltage value between the voltage pulses divided by the voltage dividing resistor, and input the reference voltage value to the comparison amplifier a second input terminal of the circuit; The comparative amplifier circuit is used to divide the voltage pulse output by the main control board of the single-chip microcomputer into pulse voltages on both sides of the reference voltage value output by the reference circuit, and input it to the first input terminal of the comparative amplifier circuit, The reference circuit inputs the output reference voltage value to the second input terminal of the comparative amplifier circuit, and performs comparison through the comparative amplifier circuit, if the voltage value of the second input terminal of the comparative amplifier circuit is greater than the voltage value of the first input terminal of the comparative amplifier circuit, The output is the high voltage value in the voltage pulse. If the voltage value of the second input terminal of the comparative amplifier circuit is less than the voltage value of the first input terminal of the comparative amplifier circuit, the output is a digital ground potential, and the output voltage pulse of the comparative amplifier is a digital information analysis circuit. Recognizable voltage pulses; The digital information analysis circuit is used to input the voltage pulse output by the comparative amplifier circuit into the digital information analysis circuit, and the counter in the digital information analysis circuit compares the high voltage value and the low voltage value within a voltage pulse cycle time length Counting, the number of high voltage values is greater than the number of low voltage values in a voltage pulse cycle, the output is a high voltage value, and the LED light is turned on, the count of high voltage values is less than the count of low voltage values in a cycle, and the output is power ground, The drive LED light is off. 2. The light-emitting diode LED drive control device using voltage pulses according to claim 1, wherein the reference circuit includes nine PMOS transistors, seven NMOS transistors, three voltage dividing resistors, five PNP dual Pole type transistor and a self-starting circuit; wherein, the source of the first PMOS transistor M1 is connected to the output terminal of the MCU main control board, and the gate of the first PMOS transistor M1 is respectively connected to the drain of the second PMOS transistor M2 , the drain of the first NMOS transistor M3, the first output terminal of the self-starting circuit, the gate of the third PMOS transistor M5, the gate of the sixth PMOS transistor M12, and the gate of the eighth PMOS transistor M15 are connected , the drain of the first PMOS transistor M1 is connected to the source of the second PMOS transistor M2; the gate of the second PMOS transistor M2 is respectively connected to the gate of the fourth PMOS transistor M6 and the gate of the fifth PMOS transistor M9 Gate, the drain of the fifth PMOS transistor M9, the drain of the fifth NMOS transistor M10, the gate of the seventh PMOS transistor M13, the gate of the ninth PMOS transistor M16, the second output of the self-starting circuit The gate of the first NMOS transistor M3 is respectively connected to the gate of the third NMOS transistor M7, the gate of the fifth NMOS transistor M10, the gate of the seventh NMOS transistor M14, the gate of the seventh NMOS transistor M14 The drain of the seventh PMOS transistor M13 is connected, the source of the first NMOS transistor M3 is connected to the drain of the second NMOS transistor M4; the gate of the second NMOS transistor M4 is respectively connected to the fourth The gate of the NMOS transistor M8, the gate of the sixth NMOS transistor M11, the drain of the third NMOS transistor M7, and the drain of the fourth PMOS transistor M6 are connected, and the source of the second NMOS transistor M4 is connected to the first One end of the first divider resistor R1 is connected; the other end of the first divider resistor R1 is connected to the emitter of the first PNP bipolar transistor Q1; the base of the first PNP bipolar transistor Q1 is connected to the first The collectors of the PNP bipolar transistor Q1 are respectively connected to the power ground; the source of the third PMOS transistor M5 is connected to the output terminal of the MCU main control board, and the drain of the third PMOS transistor M5 is connected to the fourth PMOS transistor M6 The source of the third NMOS transistor M7 is connected to the drain of the fourth NMOS transistor M8; the source of the fourth NMOS transistor M8 is connected to the emitter of the second PNP bipolar transistor Q2; The base of the second PNP bipolar transistor Q2 and the collector of the second PNP bipolar transistor Q2 are respectively connected to the power ground; the source of the fifth PMOS transistor M9 is connected to the output terminal of the microcontroller main control board; The source of the fifth NMOS transistor M10 is connected to the drain of the sixth NMOS transistor M11; the source of the sixth NMOS transistor M11 is connected to the emitter of the third PNP bipolar transistor Q3; the third PNP bipolar transistor Q3 The base of the polar transistor Q3 and the collector of the third PNP bipolar transistor Q3 are respectively connected to the power ground; the source of the sixth PMOS transistor M12 is connected to the single The output terminal of the main control board of the chip computer is connected, the drain of the sixth PMOS transistor M12 is connected to the source of the seventh PMOS transistor M13; the source of the seventh NMOS transistor M14 is connected to the fourth PNP bipolar transistor Q4 The emitter of the fourth PNP bipolar transistor Q4 and the collector of the fourth PNP bipolar transistor Q4 are respectively connected to the power ground; the source of the eighth PMOS transistor M15 is connected to the MCU main control board The drain of the eighth PMOS transistor M15 is connected to the source of the ninth PMOS transistor M16; the drain of the ninth PMOS transistor M16 is respectively connected to one end of the second voltage dividing resistor R2, the third One end of the voltage dividing resistor R3 is connected; the other end of the second voltage dividing resistor R2 is connected to the emitter of the fifth PNP bipolar transistor Q5; the base of the fifth PNP bipolar transistor Q5 is connected to the fifth PNP bipolar transistor Q5 The collector of the bipolar transistor Q5 is respectively connected to the power ground; the other end of the third voltage dividing resistor R3 is respectively connected to one end of the capacitor C and the gate of the second NMOS transistor M20 in the comparison amplifier circuit; the other end of the capacitor C Connect one end to the power ground. 3. The light-emitting diode LED drive control device using voltage pulses according to claim 1, wherein the comparative amplifier circuit includes three voltage divider resistors, three PMOS transistors, four NMOS transistors and a NOT gate ; Wherein, one end of the first voltage dividing resistor R4 is connected with the output terminal of the MCU main control board, and the other end of the first voltage dividing resistor R4 is connected with one end of the second voltage dividing resistor R5; the second voltage dividing resistor The other end of R5 is respectively connected to one end of the third voltage dividing resistor R6 and the gate of the first NMOS transistor M18; the other end of the third voltage dividing resistor R6 is connected to the power ground; the source of the first PMOS transistor M17 The pole is connected to the output terminal of the MCU main control board, the gate of the first PMOS transistor M17 is connected to its drain, the gate of the second PMOS transistor M19, and the drain of the first NMOS transistor M18; the first NMOS The source of the tube M18 is respectively connected to the source of the second NMOS tube M20 and the drain of the third NMOS tube M21; the source of the second PMOS tube M19 is connected to the output terminal of the microcontroller main control board, and the second The drain of the PMOS transistor M19 is respectively connected to the drain of the second NOMS transistor M20 and the gate of the third PMOS transistor M22; the gate of the second NMOS transistor M20 is respectively connected to the third voltage dividing resistor R3 in the reference circuit The other end of the capacitor C is connected to the other end of the capacitor C; the gate of the third NMOS transistor M21 is connected to the gate of the fourth NMOS transistor M23, and the source of the third NMOS transistor M21 is connected to the power ground; the third PMOS transistor The source of M22 is connected to the output terminal of the MCU main control board, the drain of the third PMOS transistor M22 is respectively connected to the drain of the fourth NMOS transistor M23, and the input terminal of the inverter INV; the source of the fourth NMOS transistor M23 The pole is connected to the power ground; the output terminal of the NOT gate INV is connected to the input terminal of the digital information analysis circuit. 4. A light-emitting diode LED drive control method that adopts voltage pulse is characterized in that, utilizes single-chip microcomputer main control board to output control data in the LED drive control circuit with voltage pulse mode; The concrete steps of this method comprise as follows: (1) Build a voltage pulse: (1a) Voltage pulses are composed of two voltage values with different amplitudes, high and low, and the duration of maintaining the high voltage value and the duration of maintaining the low voltage value form a voltage pulse cycle. According to the following formula, the MCU main control board calculates the high voltage value Duty cycle within one voltage pulse period: Among them, _q1 represents the duty ratio of the high voltage value in a voltage pulse cycle, τ represents the time length occupied by the high voltage value in the voltage pulse cycle, and T represents the time length of the voltage pulse cycle; (1b) Use the value of 1-q ₁ to represent the duty cycle of the low voltage value within a voltage pulse period; (1c) The main control board of the single-chip microcomputer expresses the voltage pulse when the duty cycle of the high voltage value in a voltage pulse cycle is greater than the duty cycle of the low voltage value in a voltage pulse cycle as a binary "1". The control board expresses the duty cycle of the high voltage value in a voltage pulse cycle as a binary "0" when the voltage pulse is smaller than the duty cycle of the low voltage value in a voltage pulse cycle; (1d) The single-chip microcomputer main control board stores the voltage pulse composed of two high and low voltage values with different amplitudes in binary form in the memory of the single-chip microcomputer main control board; (2) Output voltage pulse: (2a) Connect the main control board of the single-chip microcomputer to the external power supply, the main control board of the single-chip microcomputer outputs a voltage pulse, and the voltage pulse starts the self-starting circuit in the reference circuit, and the voltage through the first output terminal and the second output terminal of the self-starting circuit is the reference circuit The bias voltage is provided to trigger the reference circuit to start working. The reference circuit outputs the input voltage pulse as a voltage dividing resistor through a cascode structure amplifier circuit with a relatively high power supply rejection and a stable output when inputting 3V and 5V power supplies. A relatively stable reference voltage value between the divided voltage pulses, the reference voltage value is input to the second input terminal of the comparative amplifier circuit; (2b) The voltage pulse output by the main control board of the single-chip microcomputer is divided into pulse voltages on both sides of the reference voltage value output by the reference circuit with a voltage dividing resistor, and input to the first input terminal of the comparative amplifier circuit, and the reference circuit outputs the The reference voltage value is input to the second input end of the comparison amplifier circuit, and compared by the comparison amplifier circuit, if the voltage value of the second input end of the comparison amplifier circuit is greater than the voltage value of the first input end of the comparison amplifier circuit, the output is a voltage pulse If the voltage value of the second input end of the comparison amplifier circuit is less than the voltage value of the first input end of the comparison amplifier circuit, the output is a digital ground potential, and the output voltage pulse of the comparison amplifier is a voltage pulse that can be recognized by the digital information analysis circuit ; (3) Analyze the voltage pulse: The voltage pulse output by the comparative amplifier circuit is input to the digital information analysis circuit, and the counter in the digital information analysis circuit counts the high voltage value and the low voltage value within one voltage pulse cycle time length, and the high voltage value within one voltage pulse cycle The number of values is greater than the number of low voltage values, the output is a high voltage value, and the LED light is turned on. In one cycle, the count of the high voltage value is less than the count of the low voltage value, and the output is the power ground, and the LED light is turned off.