Voltage conversion matching circuit, mobile terminal and vehicle equipment

Abstract

The invention relates to the field of power supply equipment and discloses a voltage conversion matching circuit, a mobile terminal and vehicle equipment. The voltage conversion matching circuit is characterized by comprising a power source conversion module for supplying power to a function module and further comprising a PMOS tube, a first resistor, a second resistor, a first diode and a seconddiode, wherein a source electrode of the PMOS tube is connected with the power source to a to-be-converted voltage through the first resistor, the source electrode of the PMOS tube is connected with agate electrode of the PMOS tube through the second resistor, the gate electrode of the PMOS tube is grounded through an on-off key, a drain electrode of the PMOS tube is connected with an anode electrode of the first diode, a cathode electrode of the first diode and a cathode electrode of the second diode are commonly connected with an enable end of the power source conversion module, and a positive end of the second diode is connected with a general-purpose input and output port GPIO of the function module. The voltage conversion matching circuit is advantaged in that the power source of theto-be-converted voltage is made to be consistent with a voltage of the function module of the equipment side, and the power source conversion module and the function module are guaranteed to have identical on-off states.

Description

technical field [0001] The embodiments of the present invention relate to the field of power supply equipment, in particular to a voltage conversion matching circuit. Background technique [0002] In the battery-powered design, the battery voltage and the device voltage (the operating voltage of the functional modules) need to be consistent, but sometimes in order to increase the continuous working time of the device, a high-capacity battery is used, and the voltage of the high-capacity battery may exceed the device’s operating voltage. For example, mobile terminals (mobile phones, tablet computers, etc.) or the use of equipment for automobiles and other scenarios. When the vehicle-mounted power supply is directly used to supply power to the device, the voltage of the vehicle-mounted power supply is relatively high, which will also exceed the working voltage of the device. [0003] The inventor found that if the voltage conversion equipment is directly used for voltage tran...

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Problems solved by technology

[0003] The inventor found that if the voltage conversion equipment is directly used for voltage transformation, when the equipment or functional modules stop working, the voltage conversion equipment cannot stop working because it is directly connected to the power supply, which will easily cause equipment damage and increase standby power consumption, which is not worth the candle.

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