Abstract: A vehicle-mounted temperature-controllable oven comprising an oven body and an insulating partition plate; the insulating partition plate is arranged inside the oven body for dividing the oven body into an upper fuel gas baking chamber and a lower fuel gas baking chamber; a moveable glass cover plate that can be opened upwards is arranged at the top of the oven body; a front door plate that can be opened downwards is arranged at the front end of the oven body, and is hinged with the bottom of the oven body; a fuel gas heating device, a working platform and a baking rack are arranged in the upper fuel gas baking chamber; a control panel is arranged above the front door plate, and the control panel is provided with function knobs and a temperature-control panel for controlling the baking time and temperature, and the opening and closing of the gas path.

Abstract: A comparator includes a current mirror module, a comparison module and a buffering and outputting module. The current mirror module provides a bias current to the comparison module. The comparison module comprises a positive input end, a first negative input end and a second negative input end, the positive input end connects to an external terminal, the first negative input end and the second negative input end input a low threshold voltage and a high threshold voltage, respectively. The comparison module compares a voltage of the positive input end to the low threshold voltage and the high threshold voltage, and outputs a comparison result to the buffering and outputting module.

Abstract: The present invention discloses a class D amplifier chip with duty ratio limiting functions and the device thereof, a class D amplifier chip includes triangle wave modules, PWM modulation modules, duty ratio detection modules and logic control modules, the input differential audio signals and triangle wave signals generated by the triangle wave module are converted into low voltage pulsed PWM signals through the PWM modulation module, then gets driving processed and generates high voltage pulses; the duty ratio detection module real-time detects the duty ratio of PWM signals, when the logic control module decides the duty ratio of the PWM signals is larger than the preset maximum value, the PWM module is controlled to stop working, equals to close the audio output of the class D amplifier device; which limits the amplitude of the output audio signals, avoids burning the speaker due to an overlarge amplitude.

Abstract: The present invention discloses a comparator and low power consumption oscillator thereof.

Abstract: The present invention discloses a class D amplifier chip with duty ratio limiting functions and the device thereof, a class D amplifier chip includes triangle wave modules, PWM modulation modules, duty ratio detection modules and logic control modules, the input differential audio signals and triangle wave signals generated by the triangle wave module are converted into low voltage pulsed PWM signals through the PWM modulation module, then gets driving processed and generates high voltage pulses; the duty ratio detection module real-time detects the duty ratio of PWM signals, when the logic control module decides the duty ratio of the PWM signals is larger than the preset maximum value, the PWM module is controlled to stop working, equals to close the audio output of the class D amplifier device; which limits the amplitude of the output audio signals, avoids burning the speaker due to an overlarge amplitude.