Enhancement type voltage regulation constant-current device and constant current source constituted by same

Abstract

The invention relates to an enhanced voltage regulation constant current device and a constant current power supply which is constituted thereby, the voltage regulation constant current device comprises an input end and an output end, which is characterized in that a shunt resistance is electrically connected between the input end and the output end. As the enhanced voltage regulation constant current device and the constant current power supply of the invention reduce the power consumption of the voltage regulation constant current device, the enhanced voltage regulation constant current device and the constant current power supply have the advantages of great constant current and / or wide voltage regulation range and so on.

Description

technical field [0001] The invention relates to a voltage regulating constant current device and a constant current power supply thereof, in particular to an enhanced voltage regulating constant current device and a constant current power supply composed thereof. Background technique [0002] In the prior art, voltage-regulating constant-current devices, such as LM117, LM317, LM388, etc., are often used to form a constant-current power supply because the cost of the constant-current power supply formed by it is lower than that of switching devices. Loads that require constant current power supply, such as diode groups, provide constant current power supply. The so-called "constant current power supply" means that when the applied voltage (power supply voltage) changes, the current passing through the load remains unchanged (the "constant" here means that the change of the load current can be ignored or ignored compared with the change of the applied voltage) Excluding). Al...

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Problems solved by technology

Although this kind of voltage regulation constant current device has the advantage of high efficiency, the constant current power supply it constitutes has the disadvantage that the current of constant current power supply under the maximum allowable power consumption of the device is small

That is to say, in order to increase the current, the maximum allowable power consumption of the voltage regulation constant current device must be increased, which increases the manufacturing cost of the device and increases the volume of the device, or reduces the voltage regulation range of the constant current power supply. , resulting in a small range of constant current power supply adaptation to the applied voltage

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