LOAD ADAPTIVE POWER SUPPLY

• US 20190326830A1
• Filed: 03/20/2019
• Published: 10/24/2019
• Est. Priority Date: 04/24/2018
• Status: Active Grant

• Current Assignee: Wentai Technology Corporation
• Original Assignee: Wentai Technology Corporation
• Inventors: LIAO, Yuan-Liang
• Granted Patent: US 10,601,336 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: H02M 1/0012 Control circuits using digital or numerical techniques in DC/DC converters H02M3/157, H02M3/33515; in DC-AC converters H02M7/53873
• CPC Class Codes: H02M 1/0032 Control circuits allowing low power mode operation, e.g. in standby mode
• CPC Class Codes: H02M 1/0045 Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
• CPC Class Codes: H02M 7/219 in a bridge configuration
• CPC Class Codes: H02M 7/23 arranged for operation in parallel H02M7/2176 takes precedence
• CPC Class Codes: H03K 7/08 Duration or width modulation ; Duty cycle modulation
• 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

Abstract

A load adaptive power supply including: a conducting resistance controllable bridge rectifying unit for generating a full-wave rectified output voltage according to an AC input voltage to drive a load, and controlling an on-resistance thereof during at least one half cycle of a positive half cycle and a negative half cycle of the AC input voltage according to at least one control signal; a driving circuit unit configured to generate the at least one control signal according to a pulse modulation signal; and a digital microcontroller unit coupled with the driving circuit unit to determine a duty ratio of the pulse modulation signal according to a power of the load to drive the driving circuit unit, so as to adjust the on-resistance of the conducting resistance controllable bridge rectifying unit according to different values of the power, thereby increasing a power conversion efficiency of the power supply.

Claims

1. A load adaptive power supply comprising:

a conducting resistance controllable bridge rectifying unit for generating a full-wave rectified output voltage according to an AC input voltage to drive a load, the conducting resistance controllable bridge rectifying unit having at least one control end for receiving at least one control signal to control an on-resistance of the conducting resistance controllable bridge rectifying unit during at least one half cycle of a positive half cycle and a negative half cycle of the AC input voltage;

a driving circuit unit coupled with the conducting resistance controllable bridge rectifying unit for generating the at least one control signal according to a pulse modulation signal;

a load power measurement unit for measuring a power of the load; and

a digital microcontroller unit coupled with the driving circuit unit and the load power measurement unit to determine a duty ratio of the pulse modulation signal according to the power to drive the driving circuit unit, so as to adjust the on-resistance of the conducting resistance controllable bridge rectifying unit according to different values of the power, and thereby increase a power conversion efficiency of the load adaptive power supply.

2. The load adaptive power supply according to claim 1, wherein the conducting resistance controllable bridge rectifying unit includes four rectifying elements, and at least one of the rectifying elements is a conducting resistance controllable rectifying element having a variable on-resistance controlled by one of the at least one control signal.

3. The load adaptive power supply according to claim 2, wherein the conducting resistance controllable rectifying element includes a diode and a transistor, where two ends of the diode are connected in parallel with a channel of the transistor, and a control end of the transistor is coupled with one of the at least one control signal.

4. The load adaptive power supply according to claim 3, wherein the transistor is a field effect transistor.

5. The load adaptive power supply according to claim 1, wherein the digital microcontroller unit has a memory unit to store a control program.