A Gate Voltage Adaptive Fast Driving Circuit
A driving circuit and self-adaptive technology, applied in the direction of electric lamp circuit layout, electric light source, electrical components, etc., can solve the problems of raising the average current of the output channel, affecting the grayscale expression of the LED display screen, etc., to improve the switching speed and improve the expression. quality effect
Active Publication Date: 2018-11-06
江阴元灵芯旷微电子技术有限公司
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[0005] At the same time, the charging of the grid of the switching tube by a fixed current also affects the average value of the constant current output to a certain extent, especially in the case of low current output, the charging of the grid with a fixed current will increase the average value of the output channel. Current, which affects the grayscale expression of the entire LED display screen
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[0033] In this example, the gate voltage adaptive fast drive circuit, such as figure 2 As shown, the output current setting unit 200 is connected with the acceleration current selection unit 201 and the constant current output unit 203 comprising n groups of acceleration current selection sub-level units, the acceleration current selection unit 201 is connected with the acceleration current generation unit 202, and the acceleration current generation unit 202 is connected to the constant current output unit 203 . Specifically, the first reference voltage input terminal VREF in the output current setting unit 200 is connected to the positive input terminal of the first operational amplifier OP1, and the negative input terminal of the first operational amplifier OP1 is respectively connected to one terminal of the first resistor R1 and the first resistor R1. The source end of a transistor M1 is connected, the other end of the first resistor R1 is connected to the ground, the ou...
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The invention provides a gate voltage adaptive fast driving circuit. The gate voltage adaptive fast driving circuit includes an output current setting unit, an accelerating current selecting unit, an accelerating current generating unit and a constant current output unit; the output current setting unit is connected with the accelerating current selecting unit and the constant current output unit; the accelerating current selecting unit is connected with the accelerating current generating unit; the accelerating current generating unit is connected with the constant current output unit; set current is graded through reference voltage and a comparator array, so that constant-current output stages can be accelerated at corresponding gate ends under different output current requirements; load current output can be carried out accurately and fast when PWM signal switching is performed; a switching speed can be increased under a premise that the average value of output current is not affected; and therefore, the display quality of an LED display screen can be obviously improved.
Description
Technical field: [0001] The invention relates to a fast driving circuit, in particular to a gate voltage self-adaptive fast driving circuit used in LED constant current driving. Background technique: [0002] As people pay more and more attention to the environment and energy, LED has been widely used in the field of information display due to its advantages of high efficiency, safety and long life. The popularity of LED displays has benefited from the rapid development of LED display drive control technology. With the strong support of LED display drive technology, the LED display market has developed vigorously. Therefore, the quality of the LED display driver chip plays a vital or even decisive role in the display quality of the LED display. [0003] At present, the key indicators in LED display driving technology are mainly reflected in the following aspects: maximum output current, number of constant current source output channels, current output error and display data...
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IPC IPC(8): H02M1/08H05B37/02
Inventor 俞德军于臻李昌红彭丽李玉凤
Owner 江阴元灵芯旷微电子技术有限公司