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Insulation detection circuit and method thereof

A technology for detecting circuits and insulation states, applied in the directions of testing circuits, measuring electricity, measuring electrical variables, etc., can solve the problems of insulator breakage, leakage, mechanical wear of insulators, etc., and achieve the effect of improving convenience

Inactive Publication Date: 2014-06-11
SIMPLO TECH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For example, when the vehicle is subjected to strong vibration, the insulator is mechanically worn or broken, such as the insulator of the high-voltage cable of the vehicle is damaged, and the current of the high-voltage power supply leaks to the vehicle shell

Method used

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  • Insulation detection circuit and method thereof
  • Insulation detection circuit and method thereof
  • Insulation detection circuit and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] figure 1 It is a functional block diagram of an insulation detection circuit according to an embodiment of the present invention. see figure 1 . An insulation detection circuit 1 is suitable for detecting the insulation state between a high voltage power source 9 and a low voltage power source 8 of a carrier. The insulation detection circuit 1 is coupled between a carrier and a DC power supply, and the DC power supply is used to supply power to the carrier, or to start a vehicle generator to supply power to the carrier, thereby forming a relatively high-voltage power source 9 and a The low-voltage power supply 8 and the insulation detection circuit 1 include a first energy storage unit 10 , a second energy storage unit 12 , a constant current unit 14 and a detection unit 16 .

[0074] In practical applications, the DC power supply can be realized by a rechargeable battery, and the low-voltage power supply 8 can be realized by grounding the shell of the vehicle or by ...

Embodiment 2

[0093] the above figure 1 The circuit architecture of the middle constant current unit 14 can be implemented with different circuits. Of course, the constant current unit 14 can provide a stable constant current to the second energy storage unit 12 so that the detection unit 16 can detect the insulation state between the high voltage power source 9 and the low voltage power source 8 .

[0094] Figure 2A based on figure 1 A schematic diagram of the structure of an insulation detection circuit according to an embodiment of the present invention. see Figure 2A , for the convenience of description, the first and second energy storage units in this embodiment are the first and second capacitors 100 and 120 respectively. The constant current unit 14 includes a first amplifier 141 , a second amplifier 142 and a plurality of resistors 144 , 145 , 146 , 148 , 150 . The constant current unit 14 is used to output a stable constant current to the second capacitor 120, wherein the c...

Embodiment 3

[0104] Figure 2B based on Figure 2A The voltage waveform diagram of the insulation detection circuit of another embodiment of the present invention. see Figure 2B , Figure 2B Shown are the voltage waveforms of the second capacitor 120 in the normal state and the abnormal state. When the insulation state between the high-voltage power supply 9 and the low-voltage power supply 8 is normal, the detection unit 16 detects that the voltage waveform of the second capacitor 120 is as follows: Figure 2B The time section N; when the insulation state between the high-voltage power supply 9 and the low-voltage power supply 8 is abnormal, the detection unit 16 detects that the voltage waveform of the second capacitor 120 is as follows Figure 2B time period D.

[0105] In detail, the voltage or current waveform detected by a general insulation detection circuit is a continuous wave with no obvious voltage drop or a continuous wave with no obvious current difference, so it is diffi...

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Abstract

The present invention discloses an insulation detection circuit and a method thereof. The insulation detection circuit is suitable for detecting an insulation status between a high voltage power and a low voltage power of a vehicle is disclosed. The circuit includes a first energy storage unit, a second energy storage unit, a constant current unit, and a detection unit. The first energy storage unit is coupled to the high voltage power. The second energy storage unit is coupled between the first energy storage unit and the low voltage power. The constant current unit is coupled between the first energy storage unit and the second energy storage unit. The detection unit is coupled to the second energy storage unit for detecting a current change of the second energy storage unit. When the detection unit detects that current flowing through the second energy storage unit is smaller than a predetermined value, a detection signal representing that the insulation status is abnormal is outputted. The insulation detection circuit provides a stable constant current to the second energy storage unit for charging and discharging through the constant current unit, and the detection unit is capable of accurately detecting that the insulation between the high voltage power supply and low voltage power supply of a carrier is destroyed.

Description

technical field [0001] The invention relates to an insulation detection circuit and a method thereof, in particular to an insulation detection circuit used between a high-voltage power supply and a low-voltage power supply of a carrier and a method thereof. Background technique [0002] With the advancement of technology, transportation vehicles provide diversified electrical equipment such as lighting, electric windows, digital audio-visual, navigation systems or constant temperature and air conditioning. These electrical devices operate with electrical power from batteries, generators, or high-voltage to low-voltage converters. Of course, there must be good insulation between the high-voltage power supply and the low-voltage power supply of the vehicle, so that people can safely use diversified electrical equipment. [0003] However, the development of the vehicle is towards the hybrid vehicle or electric vehicle of the green energy industry, and the electric vehicle can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/14
CPCG01R31/02G01R31/006G01R31/52G01R31/2829
Inventor 张雅媚戴瑞言林佑儒
Owner SIMPLO TECH COMPANY
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