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Method and device for cutting off electric power

A technology for shutting off power supply and power supply, which is applied in emergency protection circuit devices, data processing power supplies, protection against overvoltage, etc., and can solve problems such as power supply burnout, needing tens of seconds to monitor, and burnt devices, etc. , to achieve the effect of improving the protection speed

Inactive Publication Date: 2009-04-29
HUAWEI TECH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

For example, the accuracy of the general power supply is between 3% and 5%. Sensitive devices require the voltage to work at 1.8V, 1.9V will be abnormal, and 2V will burn the device. As the device ages and drifts, the 1.8V power supply is easy to reach 1.9V, the power supply should be turned off immediately, but the polling monitoring method may take tens of seconds to monitor the sensitive power supply, and the power supply has been burned at this time

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  • Method and device for cutting off electric power
  • Method and device for cutting off electric power
  • Method and device for cutting off electric power

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] To improve the protection speed of the power supply, see figure 1 , this embodiment provides a method for turning off the power supply, including:

[0020] 101: Comparing the voltage value of the monitoring power supply with a reference voltage, and generating an interrupt signal when the voltage value of the monitoring power supply is greater than the overvoltage threshold, the reference voltage including the overvoltage threshold;

[0021] 102: Determine whether to turn off the monitoring power supply according to the interruption signal.

[0022] Combine below figure 2 and image 3 , detailing the process of shutting down the power supply in case of overvoltage.

[0023] S301: Acquiring a reference voltage;

[0024] Fur...

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Abstract

The invention discloses a method for cutting off a power supply and a device thereof, belonging to the field of an electronic circuit. The method comprises the following steps: a voltage value of a monitoring power supply is compared with reference voltage; when the voltage value of the monitoring power supply is larger than an overvoltage threshold, an interrupt signal is generated; the reference voltage comprises the overvoltage threshold; whether the monitoring power supply is cut off or not is determined according to the interrupt signal. The device comprises an interrupt generation module and a cut-off determination module. In the invention, whether the monitoring power supply is cut off or not is determined according to the interrupt signal generated during overvoltage of the monitoring power supply, and the monitoring power supply can be cut off quickly when the monitoring power supply has abnormal overvoltage, thereby improving the protection speed to the power supply.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a method and device for turning off a power supply. Background technique [0002] In today's complex single-board systems, the existence of multiple voltages is very common. Too high or too low voltage is not conducive to the normal operation of the system, especially when the voltage is too high, it may damage expensive processors or chips. Therefore, it is necessary to monitor the voltage and perform corresponding processing to play the role of protection and perception. [0003] At present, the hardware monitoring chip LM80 is often used to monitor the voltage. This monitoring method uses a polling mechanism to monitor the voltages of various channels. When there are many monitoring points in the system, the polling time is often on the order of tens of seconds. When there is an overvoltage-sensitive chip in the system, its protection speed cannot meet the requirements. W...

Claims

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Application Information

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IPC IPC(8): H02H3/20H02H7/20G06F1/28
Inventor 秦晓鹏张瀚臣陆晓王雪利
Owner HUAWEI TECH CO LTD
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