US Patent No. 10,461,648

ALTERNATING CURRENT STEP-DOWN CIRCUIT


Patent No. 10,461,648
Issue Date October 29, 2019
Title Alternating Current Step-down Circuit
Inventorship Wanglong Xiong, Longyan (CN)
Assignee SHENZHEN SEGRE ELECTRONIC CO., LTD., Shenzhen (CN)

Claim of US Patent No. 10,461,648

1. An alternating current step-down circuit, comprising:an AC input,
a DC output,
an AC output,
a full-bridge rectification and filtering circuit,
a flyback step-down circuit,
a DC-DC step-down unit, and
an inverting unit,
wherein the AC input is connected with an input of the full-bridge rectification and filtering circuit; an output of the full-bridge rectification and filtering circuit is connected with an input of the flyback step-down circuit and with an input of the DC-DC step-down unit; an output of the flyback step-down circuit is connected with the DC output, with the input of the DC-DC step-down unit, and with an input of the inverting unit; an output of the DC-DC step-down unit is connected with the input of the inverting unit; and an output of the inverting unit is connected with the AC output;
wherein the inverting unit comprises:
a current-voltage detection circuit,
a master control circuit,
a DC-AC full-bridge switch circuit, and
a PWM control circuit,
wherein the output of the DC-DC step-down unit is connected with an input of the current-voltage detection circuit; the output of the flyback step-down circuit is connected with an input of the master control circuit; an output of the current-voltage detection circuit is connected with the input of the master control circuit and with an input of the DC-AC full-bridge switch circuit; an output of the master control circuit is connected with an input of the PWM control circuit; an output of the PWM control circuit is connected with the input of the DC-AC full-bridge switch circuit; and an output of the DC-AC full-bridge switch circuit is connected with the AC output.