4results about How to "Wide operating voltage range" patented technology

The utility model relates to the technical field of the automotive electronic industry, in particular to a current-limiting type vehicle-mounted electric appliance surge protection circuit, which comprises a voltage input end, a voltage output end, a first resistor R1, a first diode D1, a second diode D2, an MOS (Metal Oxide Semiconductor) tube Q1 and a second resistor R2, the negative electrode of the first diode D1 and one end of the first resistor R1 are connected with the voltage input end, and the negative electrode of the second diode D2 and the other end of the first resistor R1 are connected with the voltage output end. A positive electrode of the first diode D1 is connected with one end of the second resistor R2 and a grid electrode of the MOS tube Q1, the other end of the first resistor R1 is connected with a source electrode of the MOS tube Q1, the other end of the second resistor R2 is connected with one end of the second diode D2 and a signal ground, and the other end of the second diode D2 is connected with a drain electrode of the MOS tube Q1 and a voltage output end. The utility model has the advantages of wide working voltage range, high load current capacity and constant on-resistance, and is more beneficial to conduction emission suppression along a power line.

The present invention provides a data acquisition system based on DSP and CPLD, wherein the signal conditioning circuit collects the external analog quantity of the input signal, and the external analog quantity enters the dual 4-to-1 analog switch after passing through the signal conditioning circuit, and the dual 4-to-1 analog switch outputs the voltage signal to the AD7656 chip in a time-sharing manner; the AD7656 chip completes the digital quantity conversion of the input voltage signal, and the digital quantity is transmitted to the DSP chip through a 16-bit data bus, and the DSP and CPLD perform timing control on the AD7656 chip. The present invention simplifies the forward conditioning circuit, removes the ratio adjustment and level boosting and processing circuits required for sampling with the A / D on the DSP chip, reduces the sampling error, and on the other hand, broadens the working voltage range, and is more flexible to use.

The present application relates to a long-press switch circuit, which controls the long-press and short-press level control of the off state and the on state respectively through two on-off modules composed of a NAND gate and a plurality of TG gates, so that long-press power-on when powering on and long-press power-on when powering off can be realized. The on-off states of the two on-off modules are opposite, so there is no interference between the power-on and power-off processes, thereby improving the stability of the switch. On the other hand, the charging time of the first capacitor and the second capacitor can also be used to set the long-press power-on or power-off time.