Over current protection method and apparatus used for high-power inverter power supply
An inverter power supply and protection device technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as excessive instantaneous pulses and false alarms, reduce false alarms, achieve precise protection, and provide stability and operating efficiency Effect
Inactive Publication Date: 2018-11-02
廊坊优尼珀焊接设备有限公司 +1
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Problems solved by technology
[0004] The technical purpose of the present invention is to solve the defects of the above-mentioned prior art, solve the problem of false alarms caused by signal interference in the overcurrent protection due to the instantaneous pulse being too high, and provide a method and method that can accurately and timely realize the overcurrent protection function. device, realizing precise protection of over-current
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[0022] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] As one aspect of the present invention, the overcurrent protection method for high-power inverter power provided by the present invention includes the following steps, see figure 1 with Figure 4 Shown:
[0024] The signal sampling step 101 is to collect the operating current of the high-power inverter power supply 10, and obtain the current amplitude signal of the above-mentioned operating current and the voltage amplitude signal corresponding to the operating current;
[0025] Comparing and judging steps 102 and 103, first comparing the voltage amplitude signal with a preset voltage threshold, and judging whether the voltage amplitude signal exceeds the voltage threshold; overcurrent time threshold; and,
[0026] In the result output step 104, if the voltage amplitude signal exceeds the voltage th...
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The invention relates to improvement of over current protection technologies. The invention provides an over current protection method for a high-power inverter power supply; according to the over current protection method, a signal sampling step is executed for acquiring the working current of the high-power inverter power supply, and a current amplitude signal of the working current and a voltage amplitude signal corresponding to the working current are obtained; a comparison and judgment step is performed for comparing the voltage amplitude signal with a preset voltage threshold value firstly, then judging whether the voltage amplitude signal exceeds a voltage threshold value or not, and next, judging whether the over current time, when the voltage amplitude signal exceeds the voltage threshold value, exceeds a preset over current time threshold value or not; and a result output step is performed, wherein if the voltage amplitude signal exceeds the voltage threshold value, and if the over current time exceeds the over current time threshold value, an alarm step is triggered. The invention further provides an over current protection apparatus corresponding to the method. By virtue of the over current protection method and apparatus, the problem of false alarm caused by too high instantaneous pulse due to signal interference in over current protection is solved, and accurate protection of the over current is achieved.
Description
technical field [0001] The invention relates to the field of circuit design, in particular to an overcurrent protection technology. The method and device provided by the invention are especially suitable for high-power inverter welding machines. Background technique [0002] Over Current Protection refers to a protection method that makes the protection device operate when the current exceeds a predetermined maximum value. In circuit design, especially in circuit systems including high-power inverter power supplies, it is necessary to apply overcurrent protection technology to the safety protection of the system under the conditions of overcurrent, overvoltage, overheating, power-on, etc., so as to avoid explosions and other security incidents. [0003] Traditional over-current protection methods and devices generally use the method of sampling the current amplitude, and only judge whether the pulse height exceeds the preset protection point to determine whether the over-c...
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Login to View More IPC IPC(8): H02H7/122
CPCH02H7/1227
Inventor 王可昌
Owner 廊坊优尼珀焊接设备有限公司