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Protecting and detecting circuit for power transistor

A technology of power transistors and detection circuits, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as cost and time spent on maintenance, reduced production efficiency, burnout of fuses and power supply devices, and avoid maintenance costs and time Effect

Inactive Publication Date: 2015-11-25
PRECISION MACHINERY RES & DEV CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Currently available power devices on the market, such as power supplies, uninterruptible power systems, and frequency converters, use fuses or Hall element sensing for overcurrent protection devices, and then use the control unit to judge as protection, and the response time of this process is about 10ms, for the protection of the power transistor and other components in the power supply unit, the response time is still too slow, so the power transistor will still suffer from load overcurrent and power surge hazards, and the fuse and power supply unit will burn out due to load short circuit Phenomenon, causing the user to stop the power supply equipment for repair, in addition to the repair itself requires additional maintenance costs and time, if it is a production equipment, it will also cause a reduction in production efficiency

Method used

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  • Protecting and detecting circuit for power transistor
  • Protecting and detecting circuit for power transistor
  • Protecting and detecting circuit for power transistor

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Embodiment Construction

[0016] see Figure 1 to Figure 2 , shown in the figure is the structure of the selected embodiment of the present invention, which is for illustration only, and is not limited by this structure in the patent application.

[0017] This embodiment provides a power transistor protection detection circuit, which is used for overcurrent protection of the power transistor 1, and it includes an output unit 2, a control unit 3, a diode 4, and a detection module 5, wherein:

[0018] The output unit 2 includes the power transistor 1 , and a voltage value is set by a power bus bar 21 for driving the power transistor 1 to operate.

[0019] The control unit 3 is electrically connected to the output unit 2, and provides a control signal for driving the power transistor 1 to the output unit 2. A digital-to-analog converter (not shown) is set in the control unit 3. The digital The analog converter presets a limit value of the digital signal according to the voltage value.

[0020] The diode...

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Abstract

The present invention discloses a protecting and detecting circuit for a power transistor. The circuit includes: an output unit, a control unit, a diode, and a detecting module. The power transistor generates a first voltage due to an internal resistance, and generates a second voltage after voltage crossing via the diode. The second voltage is divided by a voltage division circuit of the detecting module and then is transferred to the control unit, a digital analogue converter converts the second voltage from an analogue signal into a comparison value of a digital signal, and an accident that the control unit cuts off a control signal results in a failure to actuate when the comparison value is larger than a limit value.

Description

technical field [0001] The invention relates to a protection circuit, in particular to a power transistor protection detection circuit. Background technique [0002] Currently available power devices on the market, such as power supplies, uninterruptible power systems, and frequency converters, use fuses or Hall element sensing for overcurrent protection devices, and then use the control unit to judge as protection, and the response time of this process is about 10ms, for the protection of the power transistor and other components in the power supply unit, the response time is still too slow, so the power transistor will still suffer from load overcurrent and power surge hazards, and the fuse and power supply unit will burn out due to load short circuit Phenomenon, causing the user to stop the power supply equipment for repair, in addition to the repair itself requires additional maintenance costs and time, if it is a production equipment, it will also cause a reduction in p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/20
Inventor 林士迪周明庆
Owner PRECISION MACHINERY RES & DEV CENT
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