Overcurrent protection circuit and AI module provided with same

An overcurrent protection circuit, power supply technology, applied in emergency protection circuit devices, protections that respond to overcurrent, circuit devices, etc., can solve problems such as excessive current, direct channel processing, module channel and power supply damage, etc.

Active Publication Date: 2016-07-27
CHONGQING CHUANYI AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the field instrument fails, such as a short circuit, resulting in excessive current, or a load mismatch that causes the current to exceed the specified value, it will cause damage to the module channel and power supply
The existing method is not to directly deal with this channel, b

Method used

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  • Overcurrent protection circuit and AI module provided with same
  • Overcurrent protection circuit and AI module provided with same
  • Overcurrent protection circuit and AI module provided with same

Examples

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Embodiment Construction

[0020] see Figure 1 to Figure 5 , an AI module with an overcurrent protection circuit, an AI module with an overcurrent protection circuit, including a power supply for supplying power to field instruments, and a plurality of signal input channels, each signal input channel is used for respectively The signal collected by each field instrument is transmitted to the CPU module. The power supply circuit of each field instrument is equipped with an over-current protection circuit. The input end of each over-current protection circuit is electrically connected to the power supply, and the output end of each over-current protection circuit They are respectively electrically connected to each field instrument, and the overcurrent protection circuit includes a first transistor VT1, a second transistor VT2, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The base of the first transistor VT1 is respectively connected to one end of the third re...

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PUM

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Abstract

The invention discloses an overcurrent protection circuit and an AI module provided with the same. The AI module comprises a power supply source for supplying power to onsite instruments, and multiple signal input channels, wherein each signal input channel is used for respectively transmitting signals acquired by each onsite instrument to a CPU module, a power supply loop for supplying power to each onsite instrument is provided with an overcurrent protection circuit, the input end of each overcurrent protection circuit is electrically connected with the power supply source, and the output end of each overcurrent protection circuit is used for electrical connection with each onsite instrument. By use of the overcurrent protection circuit provided by the invention, each signal input channel in the AI module can be effectively and safely protected, other channels are not affected if one signal input channel generates a fault, and after the fault is removed, the channel can be automatically recovered.

Description

technical field [0001] The invention relates to the field of DCS control systems, in particular to an overcurrent protection circuit and an AI module provided with the overcurrent protection circuit. Background technique [0002] In the DCS control system, many 4-20mA current input modules with power distribution will be used. When the field instrument fails, such as a short circuit, resulting in excessive current, or a load mismatch that causes the current to exceed the specified value, it will cause damage to the module channel and power supply. The existing method is not to directly deal with this channel, but to add a fuse to the power supply, see Figure 6 , the disadvantage is that only when the current is too large due to the short circuit of the load on site, the fuse at the power supply terminal will work, and at the same time, a channel failure will affect the work of other adjacent channels. Contents of the invention [0003] The purpose of the present inventio...

Claims

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Application Information

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IPC IPC(8): H02H3/08H02H3/06
Inventor 潘云川文利
Owner CHONGQING CHUANYI AUTOMATION
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