Voltage detecting circuit for switching converters and the method thereof
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorNaixing Kuang
Life of this patent
Estimating the term…
Abstract
A voltage detecting circuit used with a switching converter. The switching converter having an energy storage component, a first power switch and a second switch. The voltage detecting circuit has a sample and hold circuit configured to sample and hold the voltage at the connection node of the energy storage component and the first power switch when the first power switch is OFF and the second power switch is ON; and an average circuit configured to average the sampled voltage during a switching period to generate a detecting signal in proportional to the output voltage of the switching converter.
Claims15
A voltage detecting circuit used with a switching converter, wherein the switching converter comprises an energy storage component, a first power switch and a second power switch coupled to the energy storage component, and the energy storage component stores energy when the first power switch is ON and provides energy to a load when the first power switch is OFF, the voltage detecting circuit comprising:
- a sample and hold circuit having an input terminal and an output terminal, wherein the input terminal is coupled to a connection node of the energy storage component and the first power switch, and wherein the sample and hold circuit samples the voltage at the connection node when the first power switch is OFF and the second power switch is ON, and provides a sampled signal at the output terminal;
- and
- an average circuit having an input terminal and an output terminal, wherein the input terminal is coupled to the output terminal of the sample and hold circuit to receive the sampled signal, and the average circuit performs an arithmetic operation on the sampled signal and provides a detecting signal based on the sampled signal at the output terminal, wherein the detecting signal is in proportional to the output voltage.
A switching converter comprising:
- an energy storage component configured to receive an input voltage;
- a first power switch coupled to the energy storage component, wherein the energy storage component stores energy when the first power switch is ON and provides energy to a load when the first power switch is OFF;
- a second power switch coupled to the energy storage component;
- a sample and hold circuit having an input terminal and an output terminal, wherein the input terminal is coupled to a connection node of the energy storage component and the first power switch, and wherein the sample and hold circuit samples the voltage at the connection node when the first power switch is OFF and the second power switch is ON, and provides a sampled signal at the output terminal;
- and
- an average circuit having an input terminal and an output terminal, wherein the input terminal is coupled to the output terminal of the sample and hold circuit to receive the sampled signal, and the average circuit performs arithmetic operation on the sampled signal and provides a detecting signal based on the sampled signal at the output terminal, wherein the detecting signal is in proportional to the output voltage.
A voltage detecting method for switching converter, wherein the switching converter has a first power switch, a second power switch and an energy storage component, and wherein the energy storage component stores energy when the first power switch is ON, and provides energy to a load when the first power switch is OFF, the voltage detecting method comprising:
- sampling and holding a voltage at the connection node of the first power switch and the energy storage component when the first power switch is OFF and the second power switch is ON;
- and
- performing arithmetic operation on the sampled voltage to generate a detecting voltage.
Dependencies are inferred from the claim text.