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Online integrated high precision constant current source

A high-precision, constant-current source technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as loss of constant-current control, and achieve high-precision constant-current, low output ripple voltage, and environmental adaptability strong effect

Active Publication Date: 2016-04-13
AEROSPACE CHANGFENG CHAOYANG POWER SUPPLY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional linear constant current source can only achieve relatively constant current, that is, the constant current control has been lost when the load is close to a short circuit

Method used

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  • Online integrated high precision constant current source
  • Online integrated high precision constant current source
  • Online integrated high precision constant current source

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Such as figure 1 with 2 As shown, the online integrated high-precision constant current source of the present invention includes a power frequency transformer, a rectification and filter circuit, a constant current control circuit, a constant current power circuit and an output filter circuit. AC220 volts is transformed by the online power frequency transformer T1 and then output to the integrated bridge rectifier D1, rectified by D1 and filtered by capacitor C1 to output a stable DC voltage V IN , DC voltage V IN The constant current power circuit is output to the output filter circuit, and the constant current power circuit is controlled by the constant current control circuit.

[0023] Such as image 3 As shown, the online integrated high-precision constant current source, its constant current power circuit is composed of triodes Q11, Q12,...

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Abstract

The invention discloses an online integration high-precision constant current source. The online integration high-precision constant current source comprises an industrial frequency transformer, a rectifying and filtering circuit, a constant current control circuit, a constant current power circuit and an output filter circuit. Isolated voltage reduction is realized by utilizing the industrial frequency transformer, output voltage can be linearly regulated by utilizing an operational amplifier and a triode so as to regulate output current for realizing constant current, and short-circuit constant current can be realized by utilizing positive and negative power supply of an amplifier. A linear regulation circuit adopts a pass transistor linear amplification principle control technology, and an AC (Alternating Current) voltage reduction circuit adopts a stable and firm online industrial frequency transformer regulation technology. The online integration high-precision constant current source disclosed by the invention has the characteristics that the power grid adaptability is strong, the output voltage stability accuracy is high, the output ripple voltage is low, the output current is large, the output power is large, the reliability is high, the environment adaptability is strong, and the like.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to an on-line integrated high-precision constant current source circuit. Background technique [0002] At present, the known linear constant current power supply is a kind of constant output current source. He uses the linear amplification principle of the adjustment tube to adjust the output voltage by adjusting the line voltage drop of the transistor, and then achieves a constant output current. Its constant current accuracy and response speed are much higher than other constant current power supplies. However, the traditional linear constant current source can only achieve relatively constant current, that is, the constant current control has been lost when the load is close to short circuit. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide an online integrated high-precision constant cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 白杰
Owner AEROSPACE CHANGFENG CHAOYANG POWER SUPPLY
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