A kind of insulation resistance measuring circuit
A technology of insulation resistance measurement and insulation resistance, which is applied in the electronic field and can solve problems such as high output voltage, large error, and poor precision of power resistance
Active Publication Date: 2018-11-16
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
[0004] It should be understood that the output voltage of the high-voltage DC power supply is very high. In order to avoid the breakdown of the resistors R1 and R2, they must be power resistors. However, the power resistors have the disadvantage of poor precision. The resistance value of the factory mark is different from the actual resistance Error between values can be up to ±5%
Therefore, if the insulation resistance Rx and insulation resistance Ry are calculated directly using the resistance values of the factory-marked resistors R1 and R2, the error will be very large
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[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0042] The insulation resistance measurement circuit provided by the embodiments of the present invention can be applied to various high-voltage direct current power supply systems, such as high-power data computer rooms, base station power distribution rooms, and factory workshops. The insulation resistance measurement circuit is used to measure the insulation resistance between the positive and negative bus bars of the high-voltage DC power supply and the ground. ...
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The invention discloses an insulation resistance measurement circuit. The insulation resistance measurement circuit comprises a high voltage and direct current power source DC, a high accuracy resistor Ri, power resistors Rj, Rk, R1 and R2, controllable switches Kp, Kq, K1 and K2 and a controller. After the high accuracy resistor Ri, the power resistor Rj and the controllable switch Kp are connected in series so as to form a circuit 1, one end of the circuit 1 is connected with a negative bus of the high voltage and direct current power source DC, and the other end of the circuit 1 is connected to ground (GND). After the power resistor Rk and the controllable switch Kq are connected in series so as to form a circuit 2, one end of the circuit 2 is connected with a positive bus of the high voltage and direct current power source DC, and the other end of the circuit 2 is connected to the GND. After the power resistor R1 and the controllable switch K1 are connected in series so as to form a circuit 3, one end of the circuit 3 is connected with the negative bus of the high voltage and direct current power source DC, and the other end of the circuit 3 is connected to the GND. After the power resistor R2 and the controllable switch K2 are connected in series so as to form a circuit 4, one end of the circuit 4 is connected with the positive bus of the high voltage and direct current power source DC, and the other end of the circuit 4 is connected to the GND. By using the insulation resistance measurement circuit, measurement accuracy of insulation resistance can be improved.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to an insulation resistance measuring circuit. Background technique [0002] In the configuration of a high-power data center, a high-voltage DC power supply is generally used to supply power to multiple electrical equipment, and the positive and negative busbars of the high-voltage DC power supply are required to be floating. The floating ground means that it is not directly connected to the ground. For example, the outer layers of the positive and negative busbars are covered with insulating rubber to prevent direct connection to the ground. However, with long-term use, the insulation rubber will inevitably have problems such as aging, damage or wear. If it is not handled in time, it may cause the positive and negative busbars to be grounded at the same time, causing the output to be short-circuited, which will seriously affect the high-voltage DC power supply or electrical eq...
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IPC IPC(8): G01R27/14
Inventor 魏庆环魏锋王峥
Owner HUAWEI DIGITAL POWER TECH CO LTD