Converting circuit and controller for controlling the same
AssigneeGreen Solution Technology Co., Ltd.
InventorsJi-Ming Chen, Chung-Che Yu
Life of this patent
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Abstract
The present invention uses a discharge path to release the power stored in an output capacitor of a converting circuit when the time interval between two adjacent switching thereof is too long and may generate noises whose frequencies can be sensed by human ears. Hence, the present invention can keep the operating frequency of the converting circuit higher than a predetermined frequency and reduce the audio noise of the converting circuit.
Claims26
A converting circuit, comprising:
- a converting module for converting an input voltage into an output voltage, comprising a first switching unit, a energy storage unit, and a capacitance unit, wherein the first switching unit is coupled between the input voltage and the energy storage unit, one end of the capacitance unit is coupled to the energy storage unit to provide the output voltage to a load;
- a controller, generating a first controlling signal to control the first switching unit according to a current detecting signal indicative of a current through the energy storage unit and a voltage detecting signal indicative of the output voltage;
- and
- a discharging circuit, coupled to the capacitance unit, for discharging a stored energy of the capacitance unit.
A converting controller for controlling a converting module to convert an input voltage into an output voltage, comprising:
- a first detecting unit, generating a voltage feedback signal according to the output voltage;
- a second detecting unit, generating a current judging signal according to a current of the converting module;
- and
- a driving unit, receiving the voltage feedback signal and the current judging signal and accordingly generating a controlling signal for controlling the converting module to have the output voltage larger than a predetermined voltage;
- wherein, the first detecting unit is coupled to a capacitance unit of the converting module and continuously discharges a stored energy of the capacitance unit to have a signal generating frequency that the controlling signal being generated by the controller is greater than human hearing range.
A method for reducing audible noise of a converting module, comprising the steps of:
- determining a discharging resistance value according to a predetermined output voltage, a predetermined period limit, and a minimum energy transmitted in an operating period by the converting module, which is controlled by a controlling signal of a controller;
- and
- coupling a discharging circuit to a capacitance unit of the converting module, wherein a resistance value of the discharging circuit is determined according to the discharging resistance value to have a time interval of the controlling signal generated by the controller being short than or equal to the predetermined time limit.
Dependencies are inferred from the claim text.