| US 12,356,514 B1 | ||
| Electric blanket | ||
| Long Huang, Yongcheng (CN) | ||
| Filed by Long Huang, Yongcheng (CN) | ||
| Filed on Oct. 9, 2024, as Appl. No. 18/910,696. | ||
| Int. Cl. H05B 3/34 (2006.01) | ||
| CPC H05B 3/342 (2013.01) | 10 Claims |
|
1. An electric blanket, comprising:
a PTC electric heating wire, which is connected to an AC power source and generates heat when the PTC electric heating wire is powered on;
a switch module, which is connected to the PTC electric heating wire and correspondingly causes the PTC electric heating wire to be powered on or off when it is conducted on or off;
a control module, which is connected to the switch module and capable of controlling conduction or disconnection of the switch module;
a protection module, which is connected to the control module;
wherein the control module is configured to:
obtain voltage signal at two ends of the PTC electric heating wire through the switch module, convert the voltage signal so as to obtain a resistance value of the PTC electric heating wire, obtain a current temperature value of the PTC electric heating wire based on the resistance value of the PTC electric heating wire,
control the current temperature value of the PTC electric heating wire within a preset range through the switch module, and
control the PTC electric heating wire to be powered off through the switch module when the PTC electric heating wire is detected to be burnt through by the protection module;
wherein the switch module comprises a first bidirectional thyristor T1, a second bidirectional thyristor T2, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a twenty-first resistor R21, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a tenth capacitor C10, a seventh diode D7, an eighth diode D8, and a voltage regulator D9;
wherein the control module comprises a chip U1;
wherein the protection module comprises a protective winding and a detection circuit.
|