Direct current (DC)-DC converter

Abstract

The invention provides a direct current (DC)-DC converter, which is suitable for generating power supply voltage needed by a load, and comprises a step-down circuit and a booster circuit, wherein the step-down circuit is used for receiving DC input voltage and performing step-down treatment on the DC input voltage according to a first control signal so as to output the power supply voltage, or directly outputting the DC input voltage; and the booster circuit is used for receiving the power supply voltage or the DC input voltage output by the step-down circuit and performing boosting treatment on the DC input voltage which is output by the step-down circuit according to a second control signal so as to output the power supply voltage to the load, or directly outputting the power supply voltage which is output by the step-down circuit to the load.

Description

technical field [0001] The invention relates to a power supply device, and in particular to a high-efficiency DC-to-DC converter with buck-boost function. Background technique [0002] Traditionally, in order to stably / accurately provide the power supply voltage required by loads (such as electronic devices), most DC-to-DC converters are designed with a buck-boost function. figure 1 It is a schematic circuit diagram of a conventional DC-to-DC converter 100 with a buck-boost function. Please refer to figure 1 , the DC-to-DC converter 100 includes a transformer TX with an isolation function, a switch SW, a capacitor C, a diode D, and a voltage feedback controller VF. [0003] Generally speaking, the voltage feedback controller VF will continuously detect the power supply voltage Vpwr received by the load LD, and accordingly generate a control signal CS with a variable duty cycle to boost the DC input voltage Vin. ) or buck (buck). In this way, the DC-to-DC converter 100 ca...

AI Technical Summary

Problems solved by technology

[0004] However, since the DC-to-DC converter 100 realizes the buck-boost function at the same time mainly through the transformer TX with isolation function, the transformer TX must bear all the output power (output power), so that the volume of the transformer TX will be very large, and Its efficiency is not high

Also because of this, it is difficult for the DC-to-DC converter 100 to be implemented in the design category of today's miniaturized electronic devices.

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