Power supply circuit and power supply method

Abstract

The present invention provides a power supply circuit and a power supply method. The power supply circuit comprises a CT current-limiting module, a CT control module, a discharge module and a conversion module. The CT control module is connected with the CT current-limiting module and is used for controlling the current outputted by the CT current-limiting module. The CT current-limiting module is used for conducting the current-limiting treatment on the input current under the control of the CT control module, and outputting the current after the current-limiting treatment. The discharge module is connected to the conversion module and is used for inputting the current after the current-limiting treatment, and controlling the charging / discharging of the conversion module by utilizing the current. The conversion module is used for conducting the charging / discharging operation under the control of the discharge module, and converting the desired output current. According to the scheme, the current-limiting treatment is conducted more flexibly. Therefore, the circuit and the method can be applied to a larger frequency and amplitude range of input currents.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power supply circuit and a power supply method. Background technique [0002] In the frequency conversion system, the protection equipment needs to be self-powered. The energy of the power supply circuit generally comes from the current generated by the generator. This current is used as the input current of the power supply circuit to provide energy for the power supply circuit. However, the frequency and magnitude of the current generated by some generators is unstable. In order to output stable voltage and current, the power supply circuit needs to be able to obtain sufficient energy supply when the frequency of the current generated by the generator is low or the amplitude is small. Higher frequencies or higher amplitudes can limit the energy supply. [0003] In the prior art, an energy CT (Current Transformer, current transformer) is set in the power supply circuit, a...

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Problems solved by technology

However, this design also has a limiting effect on the input current with low energy. When the frequency and / or amplitude of the input current is lower than a certain value, the power supply circuit cannot output the required voltage and current

[0004] It can be seen from the above description that in the power supply circuit of the prior art, when the current limiting process is performed, the corresponding current limiting process cannot be performed according to the input current, which is not flexible enough.

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