Low-temperature starting method of switching power supply and switching power supply

Abstract

The invention relates to a low-temperature starting method of a switching power supply and the switching power supply. The low-temperature starting method comprises the following steps that a secondary side control unit judges whether a starting-up enable signal is received or not; if yes, a soft start control module is controlled to start; after the soft start control module is started, the current environment temperature is obtained; whether the current environment temperature is smaller than a preset value is judged; if the current environment temperature is smaller than the preset value, a switching power supply is started in a low-temperature soft start control mode; and if the current environment temperature is greater than the preset value, the switching power supply is started in a normal-temperature soft-start control mode. Under the condition that the material cost of the power supply is not increased, the low-temperature starting of the power supply is realized, the stability is good, the reliability is high, and the applicable range is wide.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, and more specifically, relates to a low-temperature start-up method for switching power supplies and the switching power supply. Background technique [0002] With the rapid development of electronic power, electronic equipment has higher and higher requirements for power supplies, not only in terms of high efficiency, small size, light weight, etc., but more importantly, power supplies are required to work in different environments with higher reliability . At present, the performance of most switching power supplies degrades significantly in low temperature, high temperature and humid environments. [0003] General electronic devices are greatly affected by temperature, especially when the electrolytic capacitor is at ultra-low temperature (below -20°C), its equivalent resistance (ESR) increases and the capacity of the capacitor decreases greatly. Ripple causes abnormal prote...

AI Technical Summary

Problems solved by technology

At present, the performance of most switching power supplies is particularly degraded in low temperature, high temperature and humid environments.

[0003] General electronic devices are greatly affected by temperature, especially when the electrolytic capacitor is at ultra-low temperature (below -20°C), its equivalent resistance (ESR) increases and the capacity of the capacitor decreases greatly. Ripple causes abnormal protection such as overcurrent or overvoltage, so that the power supply cannot be started normally

[0004] At present, the usual practice is to do processing on the materials of electronic components, such as increasing the capacitance of electrolytic capacitors, using solid capacitors with little temperature influence, etc. However, these methods will increase the material cost of the power supply

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