Controller for electric article for human body

• US 7,291,813 B1
• Filed: 08/14/2006
• Issued: 11/06/2007
• Est. Priority Date: 08/14/2006
• Status: Expired due to Fees

• Current Assignee: Ching-Lin Huang, Chin-Ta Ko
• Original Assignee: Ching-Lin Huang, Chin-Ta Ko
• Inventors: Huang, Ching-Lin, Ko, Chin-Ta
• Primary Examiner(s): PASCHALL, MARK H
• Application Number:
  US11/504,790
• Time in Patent Office: 449 Days
• Field of Search: 219/490, 219/494, 219/492, 219/505, 219/497, 219/501, 219507-510, 219483-486, 219/481, 307/117, 374/163, 374/172, 323/369, 323/293
• US Class Current: 219/490
• CPC Class Codes: G05D 23/1917 using digital means
• CPC Class Codes: G05D 23/20 with sensing elements having variation of electric or magnetic properties with change of temperature G05D23/13 takes precedence

Abstract

A controller for an electric article includes a voltage-stabilizing circuit for supplying voltage stable DC power, a microprocessor, a temperature-detecting circuit, a protecting circuit, a control circuit, and a switch circuit. The temperature-detecting circuit includes several comparators commonly connected to a temperature range switch. The protecting circuit includes a comparator that detects a pre-set highest heating temperature and that is connected to the voltage stable DC power and a voltage-detecting circuit of the voltage stable DC power. The comparator of the protecting circuit is further connected to a voltage-dividing end of a thermistor connected to a temperature-detecting wire. The control circuit is connected to the microprocessor and an output of the comparator of the protecting circuit. The switch circuit is connected to an output of the voltage stable DC power and the control circuit, thereby controlling conduction or cutting off DC power supply to the electric article.

Claims

1. A controller for an electric article for human body, the controller controlling DC power supply to an electrically conductive heat-generating member in the electric article and being connected to a temperature-detecting wire of the electric article, the controller comprising:

a voltage-stabilizing circuit for supplying voltage stable DC power;

a microprocessor;

a temperature-detecting circuit including a plurality of first comparators for detecting a plurality of temperature ranges, each said first comparator including a positive input connected to an associated one of a plurality of first voltage-dividing circuits of the voltage stable DC power, each said first comparator further including a negative input connected to a voltage-dividing end of a thermistor that is connected to the temperature-detecting wire, the first comparators being commonly connected to a temperature range switch;

a protecting circuit including a second comparator for detecting a pre-set highest heating temperature, the second comparator being connected to the voltage stable DC power and a second voltage-detecting circuit of the voltage stable DC power, the second comparator further being connected to the voltage-dividing end of the thermistor;

a control circuit connected to the microprocessor and an output of the second comparator of the protecting circuit; and

a switch circuit connected to an output of the voltage stable DC power and the control circuit, thereby controlling conduction or cutting off DC power supply to the electric article,

wherein the microprocessor includes software cooperating with a clock pulse oscillating circuit to provide a countdown for abnormal heating for cutting off DC power supply via the control circuit and the switch circuit.

2. The controller as claimed in claim 1 wherein the microprocessor further includes a plurality of indicator lamps connected to and controlled by the temperature range switch and the first comparators.

3. The controller as claimed in claim 1 wherein the microprocessor further includes a buzzer that beeps when temperature-range is switched or abnormal heating occurs.

4. The controller as claimed in claim 1 wherein the control circuit includes two transistors connected in series, the transistors being respectively connected to the output of the microprocessor and the output of the second comparator of the protecting circuit.

5. The controller as claimed in claim 1 wherein the switch circuit includes a metal-oxide-semiconductor field-effect transistor having a gate, further including a third voltage-dividing circuit between the gate of the metal-oxide-semiconductor field-effect transistor and the control circuit.

6. A controller for an electric article for human body, the controller controlling DC power supply to an electrically conductive heat-generating member in the electric article and being connected to a temperature-detecting wire of the electric article, the controller comprising:

a voltage-stabilizing circuit for supplying voltage stable DC power;

a microprocessor;

a temperature-detecting circuit including a plurality of first comparators for detecting a plurality of temperature ranges, each said first comparator including a positive input connected to an associated one of a plurality of first voltage-dividing circuits of the voltage stable DC power, each said first comparator further including a negative input connected to a voltage-dividing end of a thermistor that is connected to the temperature-detecting wire, the first comparators being commonly connected to a temperature range switch;

a protecting circuit including a second comparator for detecting a pre-set highest heating temperature, the second comparator being connected to the voltage stable DC power and a second voltage-detecting circuit of the voltage stable DC power, the second comparator further being connected to the voltage-dividing end of the thermistor;

a control circuit connected to the microprocessor and an output of the second comparator of the protecting circuit; and

a switch circuit connected to an output of the voltage stable DC power and the control circuit, thereby controlling conduction or cutting off DC power supply to the electric article,

wherein the microprocessor includes software cooperating with a clock pulse oscillating circuit to set a period of time before carrying out repeated heating for a lowest temperature range after cutting off the DC power supply.