Voltage transformer with sequentially switchable voltage selection circuit

• US 7,719,867 B2
• Filed: 05/30/2008
• Issued: 05/18/2010
• Est. Priority Date: 02/26/2008
• Status: Expired due to Fees

• Current Assignee: Kerio Technologies, Inc.
• Original Assignee: Kerio Technologies, Inc.
• Inventors: Su, Carl
• Primary Examiner(s): Laxton; Gary L
• Application Number:
  US12/155,164
• Publication Number:
  US 20090212757A1
• Time in Patent Office: 718 Days
• Field of Search: 363/146, 323/293, 323/297, 323/352, 323/353, 323/354, 307/130, 307/150, 307/151
• US Class Current: 363/146
• CPC Class Codes: H02M 1/0025 Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
• CPC Class Codes: H02M 3/28 using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac

Abstract

A voltage transformer with a sequentially switchable voltage selection circuit is provided for converting input electrical energy through the sequentially switchable voltage selection circuit, which is arranged within the transformer body with its two ends electrically connected to an input port and an output port respectively, into one of a plurality of output voltage values and outputting the electrical energy. When it is desired to regulate an output voltage, a connection device must be plugged in a socket portion on the transformer body to initialize a micro control unit through feedback to change a voltage value sent to a voltage transformation unit, and in turn change the voltage of output electrical energy until a display device displays an ideal output voltage value. Then, the user removes the connection device, and the voltage value of the input electrical energy is converted into corresponding to the selected predetermined voltage value to output the electrical energy.

Claims

1. A voltage transformer with a sequentially switchable voltage selection circuit for converting the voltage value of input electrical energy into one of a plurality of predetermined output voltage values and outputting the electrical energy, comprising:

a body, which is formed with at least one socket portion, and has an input port for receiving the input electrical energy and an output port for outputting output electrical energy having one of the plurality of predetermined output voltage values;

a connection device for correspondingly plugging in the socket portion;

a sequentially switchable voltage selection circuit, which is arranged within the body with its two ends electrically connected to the input port and output port respectively, including

a voltage transformation unit; and

a micro control unit, which is electrically connected to the voltage transformation unit and the socket portion, and has a clock generator for generating a clock signal that enables a sequential change in a voltage value sent to the voltage transformation unit when the connection device is plugged in the socket portion; and

a display device for displaying the voltage value of the electrical energy outputted from the output port.

2. The voltage transformer as claimed in claim 1, wherein the micro control unit further comprises a microprocessor electrically connected to the socket portion.

3. The voltage transformer as claimed in claim 2, wherein the micro control unit further comprises a plurality of circuit elements, which have different values from each other and are actuated by the microprocessor to be sequentially and alternately connected to the voltage transformation unit.

4. The voltage transformer as claimed in claim 2, wherein the micro control unit further comprises:

a plurality of circuit elements having different values from each other; and

a switch, which are electrically connected to the circuit elements and actuated by the microprocessor to selectively electrically connect one of the different circuit elements to the voltage transformation unit.

5. The voltage transformer as claimed in claim 2, wherein the voltage transformation unit comprises an amplifier having an inverting input end, a non-inverting input end and an output end feedback-connected to the inverting input end, and the microprocessor has a pulse width modulation output end that outputs a sequential change of its duty cycle ratio when the connection device is plugged in the socket portion.

6. The voltage transformer as claimed in claim 3 or 4, wherein the voltage transformation unit comprises an amplifier having an inverting input end, a non-inverting input end and an output end feedback-connected to the inverting input end, and the circuit elements are electrically connected to the inverting input end of the amplifier respectively.

7. The voltage transformer as claimed in claim 3 or 4, wherein the voltage transformation unit comprises an amplifier having an inverting input end, a non-inverting input end and an output end feedback-connected to the inverting input terminal, and the circuit elements are electrically connected to the non-inverting input end of the amplifier respectively.

8. The voltage transformer as claimed in claim 1 wherein the micro control unit further comprises a voltage sensor that is electrically connected to the socket portion for feedback monitoring the output voltage values when the connection device is plugged in the socket portion.

9. The voltage transformer as claimed in claim 1 further comprising a bayonet socket with its one end connected to the connection device and the other end connected to an electrical product.

10. The voltage transformer as claimed in claim 1 further comprising a connection line for outputting electrical energy with its one end electrically connected to the output port and the other end provided with the connection device.

11. The voltage transformer as claimed in claim 10, wherein the display device is disposed on the connection line for outputting electrical energy.

12. The voltage transformer as claimed in claim 1 wherein the display device is disposed on the connection line for outputting electrical energy.

13. The voltage transformer as claimed in claim 1 wherein the display device is a liquid crystal display.

14. The voltage transformer as claimed in claim 1 wherein the display device comprises a plurality of light emitting diodes and indicators corresponding to the light emitting diodes.

15. The voltage transformer as claimed in claim 1 wherein the display device is disposed at the body.