CN217363361U

CN217363361U - LED lamp constant current drive circuit with digital dimming function

Info

Publication number: CN217363361U
Application number: CN202221082556.6U
Authority: CN
Inventors: 钱勇; 万雪连
Original assignee: Shanghai Shuqian Intelligent Technology Co ltd
Current assignee: Shanghai Shuqian Intelligent Technology Co ltd
Priority date: 2022-05-08
Filing date: 2022-05-08
Publication date: 2022-09-02
Anticipated expiration: 2032-05-08

Abstract

The utility model discloses a LED lamp constant current drive circuit of digital light modulation relates to a series of needs intelligent control such as LED light PWM adjusts luminance, LED control protocol, remembers a control circuit of different scenes. The constant current driving circuit comprises a DC wiring terminal, a current-limiting resistor R1, a resistor R2, a resistor R3 and a resistor R4; a capacitor C1, a polarity capacitor C2; diode D1, diode D2, light emitting diode D3, light emitting diode D4; a P-type MOS transistor Q1; inductance L147 UH; chip HI7000D U1; the LED lamp driving circuit has the advantages that the peripheral circuit is simple, the wiring is convenient and fast, the LED lamp driving circuit is suitable for the field of wide-voltage-range non-isolated power constant-current LED driving, the analog dimming and the PWM signal dimming can be switched with each other according to different input voltages, the soft start function can be realized, the on and off of an LED lamp can be controlled, the 65536-level high-gray-scale brightness adjustment can be realized, and the digital dimming remote control of the LED lamp can be realized.

Description

LED lamp constant current drive circuit with digital dimming function

Technical Field

The utility model belongs to artificial intelligence thing networking field relates to a series of needs intelligent control such as LED light is adjusted luminance, LED control agreement, memorizes a drive circuit of different scenes.

Background

Traditional mode of adjusting luminance, for the mode of adjusting luminance of simulation, through adjusting electric current and voltage, the luminance of control LED lamp except that the scope of adjusting luminance is more narrow, and the loss ratio is more, still can not satisfy present digital and intelligent control's needs, seriously influences the application of LED lamp in the aspect of artificial intelligence thing networking. The problem is perfectly solved by adopting a PWM (Pulse Width Modulation, PWM for short) wave Width control digital dimming mode, the power supply square wave is digitalized, the duty ratio of the square wave is controlled, namely the time ratio of high and low levels in the same period is adjusted, so that the purpose of controlling average current is achieved, the on and off of the LED lamp is further controlled, the brightness and gray scale adjustment is further controlled, the LED lamp is connected with various digital control systems, the application range of the LED lamp in the field of artificial intelligence Internet of things is expanded, and the development of innovation of LED illumination driving is promoted.

Disclosure of Invention

An object of the utility model is to provide a LED lamp constant current drive circuit that digitization was adjusted luminance satisfies that peripheral circuit is simple, the multi-functional average current type LED constant current driver that the research and development design of being convenient for is right, is applicable to the high-power constant current LED drive field of wide voltage range's non-isolated, and the bright of steerable LED lamps and lanterns, the going out, 65536 high grey level adjustting of lighteness to the digital remote control that adjusts luminance that can realize the LED lamp is changed luminance.

In order to achieve the above and other related objects, the present invention provides a digital dimming constant current driving circuit for LED lamp, which comprises a DC connection terminal, a current limiting resistor R11000 ohm, a resistor R23000 ohm, a resistor R31000 ohm, and a resistor R410000 ohm; a capacitor C1104 UF, a polarity capacitor C247 UF; diode D1S 8A, diode D2 SS36, light emitting diode D3, light emitting diode D4; a P-type MOS transistor Q1; inductance L147 UH; chip HI7000D U1.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: the anode V + of the DC connecting terminal is connected with the input end of a diode D1, the output end of a diode D1 is connected with the anode of a polar capacitor C2, one end of a resistor R2, the output end of the diode D2 and the input end of a light-emitting diode D3; the negative pole of the polarity capacitor C2 is connected to the negative pole V-of the DC connection terminal.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: the other end of the resistor R2 is connected to one end of a capacitor C1 and a pin 3 (VDD) of a chip HI7000D U1, and the other end of the capacitor C1 is connected to a negative electrode V-of a DC wiring terminal and grounded; the pin 3 (VDD) of the chip HI7000D U1 is connected to the pin 4 (LD) of the chip HI7000D U1.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: a pin 2 (GND) of the chip HI7000D U1 is connected to a negative electrode V-of the DC connecting terminal, a pin 1 (CS) of the chip HI7000D U1 is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to the negative electrode V-of the DC connecting terminal; the external PWM dimming signal is connected to pin 5 (PWM) of chip HI7000D U1 through resistor R3.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: a pin 6 (GATE) of the chip HI7000D U1 is connected to a grid electrode G of a P-type MOS tube Q1 through a resistor R1, a source electrode S output end of the P-type MOS tube Q1 is connected to a pin 1 (CS) of the chip HI7000D U1 and one end of a resistor R4, and a drain electrode D output end of the P-type MOS tube Q1 is connected to an input end of a diode D2 and one end of an inductor L1; the output end of the light emitting diode D3 is connected to the input end of the light emitting diode D4, and the output end of the light emitting diode D4 is connected to the other end of the inductor L1.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: the chip HI7000D U1 realizes the analog dimming function through a pin 4 (LD) port thereof; when a chip HI7000D U1 pin 4 (LD) port inputs a DC 0.2-1.2V analog dimming signal, a circuit system is in an analog dimming mode; when the voltage of a 4 pin (LD) port of a chip HI7000D U1 is lower than 0.2V, the output of the analog dimming mode is closed; when the voltage of a pin 4 (LD) port of the chip HI7000D U1 is larger than DC 1.2V, the circuit system is in a PWM dimming mode.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: pin 5 (PWM) of chip Hi7000D U1 is a PWM signal input port, which supports PWM dimming with ultra-small duty cycle and can respond to PWM pulse width waveform less than 40 ns; when the PWM signal is at a low level, the output is closed; when the PWM signal is at high level, the output is started, and the port is defaulted to be at high level input when the PWM signal is suspended.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: after the circuit is powered on, a capacitor C1 connected to a pin 3 (VDD) of a chip HI7000D U1 of a power supply is charged through a starting resistor R2, when the voltage of a DC connecting terminal is higher than 3V, the circuit starts to work until the voltage of a pin 3 (VDD) port of the chip HI7000D U1 is stabilized to be about 5.2V of clamping voltage, and the power supply current of the chip HI7000D U1 is mainly provided by a resistor R2 connected to the pin 3 (VDD) port of the chip HI7000D U1.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: a sampling resistor R4 is connected between a negative electrode V-of the DC connecting terminal and a 1 pin (CS) port of the chip Hi7000D U1, the 1 pin (CS) port of the chip Hi7000D U1 is connected with a source S pole output end of the P-type MOS transistor Q1 in parallel, and the 1 pin (CS) port of the chip Hi7000D U1 realizes accurate current control by sampling current of the 1 pin (CS) port of the chip Hi7000D U1, so that the purpose of loading LED lamps with different powers is achieved.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: pin 4 (LD) of chip Hi7000D U1 is connected with pin 3 (VDD) in parallel, pin 5 (PWM) of chip Hi7000D U1 can receive external PWM signal through R3, make the bright, go out, luminance grey level control of controllable LED lamps and lanterns of circuit.

Further, the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance still has following characteristic: a pin 5 (PWM) of the chip Hi7000D inputs a PWM pulse width signal, so that a pin 6 (GATE) of the chip Hi7000D outputs a corresponding PWM signal, the on-off duty ratio of a P-type MOS tube Q1 is controlled, and the purpose of controlling the average current of an LED lamp is achieved; when the PWM high-level wave dimming is carried out, the on-off time of the P-type MOS tube Q1, namely the bright and dark time of the LED lamp, can be changed at will by changing the duty ratio of high level and low level, and the magnitude of the forward current is changed by changing the time ratio of the PWM wave on and off the LED lamp, so that the effect of brightness and gray scale adjustment is achieved; in a PWM wave period, the larger the proportion of the high level time in the whole period is, the brighter the human eyes feel, and conversely, the darker the human eyes feel.

The utility model has the advantages that: the utility model provides a LED lamp constant current drive circuit that digital was adjusted luminance, peripheral circuit is simple, and wiring convenient and fast is applicable to wide voltage range's non-isolated power constant current LED drive field, and the simulation is adjusted luminance and can be switched over mutually according to the input voltage difference with PWM signal, realizes soft start function, the bright of steerable LED lamps and lanterns, goes out, 65536 high grey level brightness control to can realize the digital remote control system of adjusting luminance of LED lamp.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a schematic circuit diagram.

Detailed Description

The embodiment is a preferred embodiment of the present invention, and other principles and basic structures are the same as or similar to those of the embodiment, and are within the protection scope of the present invention.

The scheme in the embodiment is a digital dimming constant current driving circuit for an LED lamp, please refer to a schematic circuit diagram of fig. 1, which comprises a DC wiring terminal, a current-limiting resistor R11000 ohm, a resistor R23000 ohm, a resistor R31000 ohm and a resistor R410000 ohm; a capacitor C1104 UF, a polar capacitor C247 UF; diode D1S 8A, diode D2 SS36, light emitting diode D3, light emitting diode D4; a P-type MOS transistor Q1; inductance L147 UH; chip HI7000D U1.

Further, in this embodiment, the positive electrode V + of the DC connection terminal is connected to the input terminal of the diode D1, and the output terminal of the diode D1 is connected to the positive electrode of the polar capacitor C2, one end of the resistor R2, the output terminal of the diode D2, and the input terminal of the light emitting diode D3; the negative pole of the polarity capacitor C2 is connected to the negative pole V-of the DC connection terminal.

Further, in this embodiment, the other end of the resistor R2 is connected to one end of the capacitor C1 and the pin 3 (VDD) of the chip HI7000D U1, and the other end of the capacitor C1 is connected to the negative electrode V-of the DC connection terminal and grounded; pin 3 (VDD) of chip HI7000D U1 is connected to pin 4 (LD) of chip HI7000D U1.

Furthermore, in the embodiment, a pin 2 (GND) of the chip HI7000D U1 is connected to a negative electrode V-of the DC connection terminal, a pin 1 (CS) of the chip HI7000D U1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to a negative electrode V-of the DC connection terminal; the external PWM dimming signal is connected to pin 5 (PWM) of chip HI7000D U1 through resistor R3.

Further, in this embodiment, a pin 6 (GATE) of the HI7000D U1 is connected to a GATE G of the P-type MOS transistor Q1 through a resistor R1, a source S output terminal of the P-type MOS transistor Q1 is connected to a pin 1 (CS) of the HI7000D U1 and one end of the resistor R4, and a drain D output terminal of the P-type MOS transistor Q1 is connected to an input terminal of the diode D2 and one end of the inductor L1; the output end of the light emitting diode D3 is connected to the input end of the light emitting diode D4, and the output end of the light emitting diode D4 is connected to the other end of the inductor L1.

Further, in this embodiment, the chip HI700D U1 implements an analog dimming function by applying to its pin 4 (LD) port; when a chip HI7000D U1 pin 4 (LD) port inputs a DC 0.2-1.2V analog dimming signal, a circuit system is in an analog dimming mode; when the voltage of a 4 pin (LD) port of a chip HI7000D U1 is lower than 0.2V, the output of the analog dimming mode is closed; when the voltage of a pin 4 (LD) port of the chip HI7000D U1 is larger than DC 1.2V, the circuit system is in a PWM dimming mode.

Further, in this embodiment, pin 5 (PWM) of the chip Hi7000D U1 is a PWM signal input port, and the PWM signal input port supports PWM dimming with an ultra-small duty cycle and can respond to a PWM pulse width waveform smaller than 40 ns; when the PWM signal is at a low level, the output is closed; when the PWM signal is at high level, the output is started, and the port is defaulted to be at high level input when the PWM signal is suspended.

Further, in this embodiment, after the circuit is powered on, the capacitor C1 connected to the pin 3 (VDD) of the chip HI7000D U1 of the power supply is charged through the starting resistor R2, and when the voltage of the DC connection terminal is higher than 3V, the circuit starts to operate until the voltage of the pin 3 (VDD) of the chip HI7000D U1 is stabilized to reach the clamp voltage of about 5.2V, and the supply current of the chip HI7000D U1 is mainly provided by the resistor R2 connected to the pin 3 (VDD) of the chip.

Furthermore, in this embodiment, a sampling resistor R4 is connected between the negative electrode V-of the DC connection terminal and the 1 pin (CS) port of the Hi7000D U1, the 1 pin (CS) port of the Hi7000D U1 is connected in parallel with the source S output terminal of the P-type MOS transistor Q1, and the 1 pin (CS) port of the Hi7000D U1 realizes accurate current control by sampling the current of the 1 pin (CS) port thereof, so as to achieve the purpose of loading LED lamps with different powers.

Further, in this embodiment, the pin 4 (LD) of the chip Hi7000D U1 is connected in parallel to the pin 3 (VDD), and the pin 5 (PWM) of the chip Hi7000D U1 can receive an external PWM signal through the resistor R3, so that the circuit can control on/off and brightness gray scale adjustment of the LED lamp.

Furthermore, in this embodiment, a pin 5 (PWM) of the chip Hi7000D inputs a PWM pulse width signal, so that a pin 6 (GATE) of the chip Hi7000D outputs a corresponding PWM signal, thereby controlling the on-off duty ratio of the P-type MOS transistor Q1 and achieving the purpose of controlling the average current of the LED lamp; when the PWM high-level wave dimming is carried out, the on-off time of the P-type MOS tube Q1, namely the bright and dark time of the LED lamp, can be changed at will by changing the duty ratio of high level and low level, and the magnitude of the forward current is changed by changing the time ratio of the PWM wave on and off the LED lamp, so that the effect of brightness and gray scale adjustment is achieved; in a PWM wave period, the larger the proportion of the high level time in the whole period is, the brighter the human eyes feel, and conversely, the darker the human eyes feel.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The constant current driving circuit of the LED lamp of a kind of digitized dimming, wherein a digitized dimming LED lamp constant current driving circuit includes DC connecting terminal, current-limiting resistance R11000 ohm, resistance R23000 ohm, resistance R31000 ohm, resistance R410000 ohm; a capacitor C1104 UF, a polar capacitor C247 UF; diode D1S 8A, diode D2 SS36, light emitting diode D3, light emitting diode D4; a P-type MOS transistor Q1; inductance L147 UH; chip HI7000D U1; the positive pole V + of the DC connecting terminal is connected with the input end of a diode D1, the output end of a diode D1 is connected with the positive pole of a polar capacitor C2, one end of a resistor R2, the output end of a diode D2 and the input end of a light-emitting diode D3; the negative pole of the polarity capacitor C2 is connected to the negative pole V-of the DC connection terminal.

2. The constant current driving circuit of the digital dimming LED lamp according to claim 1, wherein: the other end of the resistor R2 is connected into one end of a capacitor C1 and a pin 3 of a chip HI7000D U1, and the other end of the capacitor C1 is connected into a negative electrode V-of a DC connecting terminal and grounded; pin 3 of chip HI7000D U1 is connected to pin 4 of chip HI7000D U1.

3. The constant current driving circuit of the digital dimming LED lamp according to claim 2, characterized in that: a pin 2 of the chip HI7000D U1 is connected to a negative electrode V-of the DC wiring terminal, a pin 1 of the chip HI7000D U1 is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to a negative electrode V-of the DC wiring terminal; the external PWM dimming signal is connected to pin 5 of chip HI7000D U1 through resistor R3.

4. The constant current driving circuit of the digital dimming LED lamp according to claim 3, characterized in that: a pin 6 of the chip HI7000D U1 is connected to a gate G electrode of a P-type MOS transistor Q1 through a resistor R1, a source S electrode output end of the P-type MOS transistor Q1 is connected to a pin 1 of the chip HI7000D U1 and one end of a resistor R4, and a drain D electrode output end of the P-type MOS transistor Q1 is connected to an input end of a diode D2 and one end of an inductor L1; the output end of the light emitting diode D3 is connected to the input end of the light emitting diode D4, and the output end of the light emitting diode D4 is connected to the other end of the inductor L1.

5. The constant current driving circuit of the digital dimming LED lamp as claimed in claim 4, wherein: the chip HI7000D U1 realizes the analog dimming function through the pin 4 port; when a DC 0.2-1.2V analog dimming signal is input into a chip HI7000D U1 pin 4 port, a circuit system is in an analog dimming mode; when the voltage of a pin 4 of a chip HI7000D U1 is lower than 0.2V, the output of the analog dimming mode is closed; when the voltage of a 4-pin port of the chip HI7000D U1 is larger than DC 1.2V, the circuit system is in a PWM dimming mode.

6. The constant current driving circuit of the digital dimming LED lamp according to claim 5, wherein: pin 5 of chip Hi7000D U1 is a PWM signal input port, which supports PWM dimming with ultra-small duty cycle and can respond to PWM pulse width waveform less than 40 ns; when the PWM signal is at a low level, the output is closed; when the PWM signal is at high level, the output is started, and the port is defaulted to be at high level input when the PWM signal is suspended.

7. The constant current driving circuit of the digital dimming LED lamp as claimed in claim 6, wherein: after the circuit is powered on, a capacitor C1 connected to a pin 3 of a chip HI7000D U1 of a power supply is charged through a starting resistor R2, when the voltage of a DC wiring terminal is higher than 3V, the circuit starts to work until the voltage of a pin 3 port of the chip HI7000D U1 is stabilized to be about 5.2V of clamping voltage, and the power supply current of the chip HI7000D U1 is mainly provided by a resistor R2 connected to the pin 3 port of the chip HI7000D U1.

8. The constant current driving circuit of the digital dimming LED lamp according to claim 7, characterized in that: a sampling resistor R4 is connected between the negative electrode V-of the DC connecting terminal and a 1-pin port of the chip Hi7000D U1, and a 1-pin port of the chip Hi7000D U1 is connected with the source S-electrode output end of the P-type MOS transistor Q1 in parallel.