Constant current circuit capable of clamping output voltage of operational amplifier at threshold voltage of drive tube
A clamping circuit and output voltage technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of high price, slow response speed, long threshold voltage time, etc., to lengthen the response time and improve the response speed. , the effect of reducing the response time
Active Publication Date: 2017-09-22
GUANGDONG AOPUTE TECH CO LTD
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Problems solved by technology
For ordinary op amps, it takes a relatively long time for the output voltage to climb to the threshold voltage of the drive tube, resulting in a slow response speed; although high-speed op amps can reduce the response time, but high-speed op amps are expensive, which is not conducive to cost control
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[0012] Certain terms are used, for example, in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.
[0013] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", horizontal" etc. are based on th...
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The invention relates to the technical field of semiconductor integral circuits and specifically relates to a constant current circuit capable of clamping an output voltage of an operational amplifier at a threshold voltage of a drive tube. The circuit comprises a main control module, a clamping circuit, an operational amplifier, a constant current drive tube, a feedback circuit, a load power source and a load interface, wherein the main control module, the clamping circuit, the constant current drive tube and the feedback circuit are electrically connected to the operational amplifier; the main control module is electrically connected to the clamping circuit; the feedback circuit is electrically connected to the constant current drive tube; and the constant current drive tube and the load power source are electrically connected to the load interface. Traditionally, when the constant current circuit composed of the operational amplifier is switched off, the operational amplifier will output a minimum voltage; the drive tube on the constant current circuit has the certain threshold voltage, so the operational amplifier shall output a voltage higher than the threshold voltage of the drive tube when the constant current circuit is switched on again; and therefore, response time of the constant current circuit will be much longer. By the structure provided by the invention, the circuit response time is greatly reduced, and the response speed of the constant current circuit is increased.
Description
technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a constant current circuit in which the output voltage of an operational amplifier is clamped at the threshold voltage of a drive tube. Background technique [0002] At present, constant current circuits have been applied to various fields of electronic power, especially in the field of visual light source lighting. Generally, a constant current circuit composed of an operational amplifier and a drive tube has good stability and high precision, and has been widely used. However, each time such a constant current circuit is turned on, the drive tube needs a start-up time, so that the output voltage of the operational amplifier climbs to the threshold voltage of the drive tube, so that the drive tube can be completely turned on and turned on. This start-up time is determined by The minimum voltage output by the operational amplifier is jointly determined ...
Claims
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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 卢盛林李志荣
Owner GUANGDONG AOPUTE TECH CO LTD