Abstract: A switching converter circuit for switching one end of an inductor therein between plural voltages according to a pulse width modulation (PWM) signal to convert an input voltage to an output voltage. The switching converter circuit has a driver circuit including a high side driver, a low side driver, a high side sensor circuit, and a low side sensor circuit. The high side sensor circuit is configured to sense a gate-source voltage of a high side metal oxide semiconductor field effect transistor (MOSFET), to generate a low side enable signal for enabling the low side driver to switch a low side MOSFET according to the PWM signal. The low side sensor circuit is configured to sense a gate-source voltage of a low side MOSFET, to generate a high side enable signal for enabling the high side driver to switch a high side MOSFET according to the PWM signal.

Abstract: A pacifier thermometer of the present invention is made of plastic material, preferably silicone, having a cover to protect a nipple, a frame having a hole at the center portion that is concentric with both an annular projection at the convex side and a stop shoulder formed between the hole and the projection, a nipple having an inner hole at the top closed end and a circumferential flange at the bottom open end, an electronic compartment having a cap with an extending nodule at the center portion of one side that has a concentric hole formed in the nodule, a shell with a transparent window, and a circuit board that includes a chip, an LCD, and a speaker. When sensing temperature, the sensor sends the signal to the chip, which decodes the signal into a frequency signal, and then sends the frequency signal to a comparator for comparison with a prestored frequency range. The comparator then displays the reading on the LCD.