POWER CONTROL CIRCUIT AND A POWER CONTROL METHOD

• US 20200136495A1
• Filed: 05/13/2019
• Published: 04/30/2020
• Est. Priority Date: 10/25/2018
• Status: Active Grant

• Current Assignee: Quanta Computer
• Original Assignee: Quanta Computer
• Inventors: KUO, Hsin-Chih
• Granted Patent: US 10,686,360 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 1/28 Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
• CPC Class Codes: G06F 1/3206 Monitoring of events, devices or parameters that trigger a change in power modality
• CPC Class Codes: G06F 1/3296 by lowering the supply or operating voltage
• CPC Class Codes: H02M 1/0032 Control circuits allowing low power mode operation, e.g. in standby mode
• CPC Class Codes: H02M 1/0054 Transistor switching losses periodically suspending operation of switching converter in low power mode H02M1/0035
• CPC Class Codes: H02M 1/08 Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A power control circuit includes a detection device, a first control device, and a second control device. When the detection signal is changed from lower to higher than the first voltage, the first control device'"'"'s output is changed to the second potential. When the detection signal is changed from higher to lower than the second voltage, the first control device'"'"'s output is changed to the first potential. When the detection signal is changed from lower to higher than the third voltage, the second control device'"'"'s output is changed to the fourth potential. When the detection signal is changed from higher to lower than the fourth voltage, the second control device'"'"'s output is changed to the third potential. According to the first or second potentials, the circuit device turns on/off the first function. According to the third or fourth potentials, the circuit device turns on/off the second function.

Claims

1. A power control circuit for controlling a circuit device to turn on or off a first function or a second function, the power control circuit comprising:

a detect device, coupled to a DC power source and the circuit device and generating a detect signal based on a power of the DC power source;

a first control device, coupled to the detect signal and monitoring a variation of the detect signal corresponding to a first voltage and a second voltage, wherein the second voltage is lower than the first voltage, when the detect signal is changed from lower to higher than the first voltage, an output of the first control device is changed from a first potential to a second potential, when the detect signal is changed from higher to lower than the second voltage, the output of the first control device is changed from the second potential to the first potential, wherein the second potential is higher than the first potential; and

a second control device, coupled to the detect signal and monitoring variations in the detect signal corresponding to a third voltage and a fourth voltage, wherein the fourth voltage is lower than the third voltage, when the detect signal is changed from lower to higher than the third voltage, an output of the second control device is changed from a third potential to a fourth potential, when the detect signal is changed from higher to lower than the fourth voltage, the output of the second control device is changed from the fourth potential to the third potential, wherein the fourth potential is higher than the third potential;

wherein according to the first potential and the second potential from the first control device, the circuit device turns on or off the first function, and according to the third potential and the fourth potential from the second control device, the circuit device turns on or off the second function, and

wherein the third potential is lower than the first potential, and the fourth potential is higher than the second potential.

2. The power control circuit of claim 1, wherein the first control device comprises a first hysteresis circuit, configured to generate the first voltage and the second voltage and monitor variations in the detect signal corresponding to the first voltage and the second voltage for changing the output of the first control device to be the first potential or the second potential.

3. The power control circuit of claim 1, wherein the second control device comprises a second hysteresis circuit, configured to generate the third voltage and the fourth voltage and monitor variations in the detect signal corresponding to the third voltage and the fourth voltage for changing the output of the second control device to be the third potential or the fourth potential.

4. The power control circuit of claim 1, wherein the detect device further comprises a current detector for detecting a current of the DC power source to output the detect signal corresponding to the power.

5. A power control method, executed by a power control circuit for controlling a circuit device to turn on or off a first function or a second function, wherein the power control method comprises:

detecting a current value of a DC power source for generating a detect signal;

when the detect signal is detected to have changed from lower to higher than a first voltage, an output of a first control device is changed from a first potential to a second potential, wherein the second potential is higher than the first potential;

when the detect signal is detected to have changed from higher to lower than a second voltage, the output of the first control device is changed from the second potential to the first potential;

when the detect signal is detected to have changed from lower to higher than a third voltage, an output of a second control device is changed from a third potential to a fourth potential, wherein the fourth potential is higher than the third potential; and

when the detect signal is detected to have changed from higher to lower than a fourth voltage, the output of the second control device is changed from the fourth potential to the third potential;

wherein according to the first potential and the second potential from the first control device, the circuit device turns on or off the first function, and according to the third potential and the fourth potential from the second control device, the circuit device turns on or off the second function; and

wherein the third voltage is lower than the first voltage, the third voltage is higher than the fourth voltage, and the fourth voltage is higher than the second voltage.