Safe Heating Circuit and Electric Blanket Provided with Safe Heating Circuit
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United States of America Patent
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Issued Date -
Mar 27, 2025
app pub date -
Dec 10, 2024
filing date -
Dec 10, 2024
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Abstract
A safe heating circuit, comprising a PTC electric heating element; a first switching element, configured to switch on-off a power loop of the heating element; a first voltage acquisition circuit, configured to sample a first temperature voltage; an NTC element configured to receive a leakage current; a second voltage acquisition circuit, configured to sample a second temperature voltage; and a controller, configured to compare the first or second temperature voltage to a set temperature voltage and output the on-off signal, the second voltage acquisition circuit comprises a voltage divider circuit and a third current limiting circuit, and a second filter circuit; one signal input terminal is coupled to the second filter circuit to receive a sampling signal; and a current flow-in terminal of the third current limiting circuit is coupled to a power terminal, and a current flow-out terminal is coupled to the connection terminal.
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