Driving control circuit of power transistor, lighting control circuit and lighting circuit

Patent metadata

Field	Value
Publication number	US-12471194-B2
Application number	US-202418594388-A
Country	US
Kind code	B2
Filing date	Mar 4, 2024
Priority date	Mar 13, 2023
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

The present application discloses a driving control circuit of a power transistor, a lighting control circuit and a lighting circuit. The control circuit includes a protocol conversion circuit and a driving regulation circuit. The protocol conversion circuit stores received input data signal as multi-channel digital signals and converts the multi-channel digital signals into a plurality of regulation parameters. The driving regulation circuit adjusts the driving current and driving voltage of the power transistor according to a plurality of regulation parameters so as to match various types of power transistors. The control circuit according to the present disclosure converts the input data signal into a plurality of regulation parameters, adjusts the driving current and driving voltage of the power transistor to match various types of power transistors, and improves driving capability, compatibility, and adaptability of the circuit.

First claim

What is claimed is:

1 . A driving control circuit of a power transistor, comprising:
a protocol conversion circuit that stores received input data signal as multi-channel digital signals and converts the multi-channel digital signals into a plurality of regulation parameters; a driving regulation circuit that is coupled to the protocol conversion circuit and a control terminal of the power transistor, and that adjusts a driving current according to a driving current regulation parameter in a plurality of regulation parameters, and/or adjusts a driving voltage of the power transistor according to a driving voltage regulation parameter in the plurality of regulation parameters, so as to match various types of power transistors, wherein the driving regulation circuit comprises: a voltage regulator that is coupled to the protocol conversion circuit, a power supply terminal and the control terminal of the power transistor, and that converts an input voltage at the power supply terminal into a supply voltage to be supplied to a post stage, and supplying a driving voltage to the power transistor via an output terminal; a pull-up current source that is coupled between an output of the voltage regulator and the control terminal of the power transistor; and a pull-down current source that is coupled between the control terminal of the power transistor and a ground terminal, the pull-up current source and the pull-down current source together providing a driving current to the power transistor.

2 . The driving control circuit according to claim 1 , wherein the various types of power transistors include Si transistors, SiC transistors, and GaN transistors.

3 . The driving control circuit according to claim 1 , wherein a driving current and a driving voltage of the GaN transistor have values both smaller than those of the Si transistor.

4 . The control circuit according to claim 1 , wherein the driving regulation circuit adjusts the driving current of the power transistor to control on and off rates of the power transistor.

5 . The driving control circuit according to claim 1 , wherein the voltage regulator adjusts the driving voltage according to the driving voltage regulation parameter; the pull-up current source and the pull-down current source adjust the driving current according to the driving current regulation parameters.

6 . The driving control circuit according to claim 1 , wherein the plurality of regulation parameters are analog signals, and the plurality of regulation parameters further include a standby regulation parameter for configuring a sleep mode for the driving control circuit of the power transistor.

7 . The driving control circuit according to claim 6 , wherein the driving voltage regulation parameter corresponds to a digital signal of 1 bit, the driving current regulation parameter corresponds to a digital signal of 2 bits, and the standby regulation parameter corresponds to a digital signal of 1 bit.

8 . The driving control circuit according to claim 1 , wherein the protocol conversion circuit converts the input data signal into the driving voltage regulation parameter and the driving current regulation parameter using a single-wire communication protocol or a serial communication protocol.

9 . A lighting control circuit, comprising:
a power transistor; a driving control circuit of the power transistor according to claim 1 ; and a dimming selection circuit that selects a dimming mode according to a digital signal, and that generates a PWM dimming signal in a chopper dimming mode, and generates an analog dimming signal in an analog dimming mode, so as to control on and off states of the power transistor.

10 . The lighting control circuit according to claim 9 , further comprising:
a protection circuit that obtains a physical parameter threshold according to a regulation parameter generated by the digital signal, and protects the circuit when a sampled physical parameter reaches the physical parameter threshold.

11 . A lighting device, comprising:
multi-channel LED strings; and and the lighting control circuit according to claim 9 for controlling a dimming mode of the multi-channel LED strings.

Assignees

• Joulwatt Tech Co Ltd

Inventors

• Wu Minghao
• Liu Guoqiang

Classifications

• H05B45/37

  Converter circuits · CPC title

• H05B45/3725

  Switched mode power supply [SMPS] · CPC title

• H05B45/375

  using buck topology · CPC title

• H05B45/10

  Controlling the intensity of the light · CPC title

• H05B45/50

  responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits · CPC title