Power supply for outputting a steady state voltage according to a load requirement

• US 6,906,932 B2
• Filed: 07/01/2003
• Issued: 06/14/2005
• Est. Priority Date: 07/01/2003
• Status: Active Grant

• Current Assignee: Compal Electronics Incorporated
• Original Assignee: Compal Electronics Incorporated
• Inventors: Kung, Shao-Tsu, Chuang, Chih-Tarng
• Primary Examiner(s): Laxton, Gary L.
• Application Number:
  US10/609,534
• Publication Number:
  US 20050002208A1
• Time in Patent Office: 714 Days
• Field of Search: 323/282, 323/283, 323349-351, 363/20, 363/21.04, 363/21.07, 363/21.09, 363/21.12, 363/21.15, 363/21.17, 363/97
• US Class Current: 363/21.07
• CPC Class Codes: H02M 3/33515 with digital control

Abstract

A power supply includes a power supply unit having an input end for receiving an oscillating voltage, and an output end for outputting a steady state voltage from the oscillating voltage according to a feedback signal, and a control circuit having a micro-controller having a first input port for receiving a measuring signal from a load, and decision logic for generating a control voltage according to the measuring signal, and a feedback controller having a first input end electrically connected to the output end of the power supply for receiving the steady state voltage, a second input end electrically connected to the micro-controller for receiving the control voltage from the micro-controller, and a output end for outputting the feedback signal according to the control voltage and the steady state voltage.

Claims

1. A power supply for outputting a steady state voltage or current according to a load requirement, the power supply comprising:

a power supply unit having an input end for receiving an oscillating voltage, and an output end for outputting a steady state voltage from the oscillating voltage according to a feedback signal; and

a control circuit comprising;

a micro-controller comprising a first input port for receiving a measuring signal from a load indicating the load requirement, and decision logic capable of generating a control voltage according to the measuring signal if the measuring signal is received and generating the control voltage according to a manual adjust signal if the measuring signal is not received; and

a feedback controller having a first input end electrically connected to the output end of the power supply for receiving the steady state voltage, a second input end electrically connected to the micro-controller for receiving the control voltage from the micro-controller, and a output end for outputting the feedback signal according to the control voltage and the steady state voltage.

2. The power supply of claim 1 wherein the micro-controller filer comprises an analog-to-digital converter for transforming an analog measuring signal from the load into a digital measuring signal.

3. The power supply of claim 1 wherein the micro-controller further comprises a second input port and a variable signal generator electrically connected to the second input port for generating the manual adjust signal.

4. The power supply of claim 3 wherein the micro-controller further comprises a detecting circuit electrically connected to the first input port for detecting the presence of the measuring signal, and a multiplexer electrically connected to the detecting circuit;

wherein when the measuring signal is detected, the multiplexer outputs the measuring signal, otherwise the multiplexer outputs the manual adjust signal.

5. The power supply of claim 3 wherein the variable signal generator is an adjustable voltage source or an adjustable current source.

6. The power supply of claim 1 wherein the micro-controller further comprises a memory for storing a table that records control voltage values corresponding to each measuring signal, and the decision logic indexes into the table according to the measuring signal to output the control voltage.

7. A power supply for outputting a steady state voltage or current according to a load requirement, the power supply comprising:

a power supply unit having an input end for receiving an oscillating voltage, and an output end for outputting a steady state voltage from the oscillating voltage according to a feedback signal; and

a control circuit comprising;

a micro-controller comprising a first input port for receiving a measuring signal from a load, a detecting circuit electrically connected to the first input port for detecting the presence of the measuring signal, a second input port, a variable signal generator electrically connected to the second input port for generating a manual adjustment signal, a multiplexer electrically connected to the detecting circuit and the variable signal generator, and decision logic connected to an output of the multiplexer for generating a control voltage according to the output of the multiplexer, wherein when the measuring signal is detected, the multiplexer outputs the measuring signal, otherwise the multiplexer outputs the manual adjust signal; and

a feedback controller having a first input end electrically connected to the output end of the power supply for receiving the steady state voltage, a second input end electrically connected to the decision logic for receiving the control voltage from the micro-controller, and a output end electrically connected to the power supply unit for outputting the feedback signal according to the control voltage and the steady state voltage.

8. The power supply of claim 7 wherein the micro-controller fierier comprises a memory for storing a table that records control voltage values corresponding to each measuring signal, and the decision logic indexes into the table according to the measuring signal to output the control voltage.

9. A power supply comprising:

an output for outputting a steady state voltage or current according to a feedback signal;

an input for receiving the feedback signal;

a feedback controller comprising a first input connected to the output of the power supply, a second input for receiving a control voltage, and an output connected to the input of the power supply for transmitting the feedback signal to the power supply according to a control voltage; and

a micro-controller comprising an output connected to the second input of the feedback controller, a detecting circuit capable of detecting the presence of a measuring signal from a load, a variable signal generator for generating a manual adjustment signal, and a multiplexer having inputs respectively connected to outputs of the detecting circuit and the variable signal generator and an output electrically connected to the output of the micro-controller, the micro-controller outputting the control voltage according to the measuring signal when the measuring signal is detected, the micro-controller outputting the control voltage according to the manual adjust signal when the measuring signal is not detected.

10. The power supply of claim 9 wherein the micro-controller further comprises decision logic connected between the output of the multiplexer and the output of the micro-controller, the decision logic generating the control voltage according to the output of the multiplexer.

11. The power supply of claim 10 wherein the micro-controller further comprises a memory for storing a table that records control voltage values corresponding to each measuring signal, and the decision logic indexes into the table according to the measuring signal to output the control voltage.