Direct current electric energy conversion method and system with DCDC module automatic conversion function

Abstract

Disclosed is a direct current electric energy conversion method and system with a DCDC module automatic conversion function. The system comprises N DCDC modules arranged in parallel, an output voltagedetection and feedback module and a clock signal module for providing working clock signals; a control module detects a current which is output to an external load, and works out that the number of the DCDC modules which need to be started is Q according to the value of the load current, and outputs enabling and starting control signals to Q DCDC modules; the working clock signals CLKN of the Q DCDC modules are the same in period, and the phase difference of each working clock signal CLKN is equal to 360 degrees / Q; the multiple paths of DCDC modules are connected in parallel, so that a relatively high current can be output and the system power consumption is also lowered; the multiple paths of DCDC modules are arranged on the same chip, so that quite high parameter consistency characteristic and high current balance characteristic in each path are achieved; and by virtue of time-sharing soft start and phase shifting time-sharing control, overcharging can be avoided, the ripple wave ofthe power supply output voltage is lowered, and more stable output characteristic is realized.

Description

technical field [0001] The invention belongs to a direct current power conversion circuit and system; in particular, it relates to a current mode direct current power conversion method and system with a plurality of direct current power conversion units. Background technique [0002] Switching regulators commonly used in DC power conversion in the prior art include BUCK mode switching regulators, BOOST mode switching regulators and BUCK-BOOST mode switching regulators. Regardless of the mode of switching regulators, there is usually only one DCDC conversion circuit. When When the output current is large, the efficiency is low, the heat generation is large, and the output ripple is also large, which requires a large saturation current of the inductor. In the prior art, there is only one DCDC module in a power conversion system. When a large output current is required, the saturation current of the inductor is large, and the volume of the inductor is also large; it is obviousl...

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Problems solved by technology

In the prior art, there is only one DCDC module in a power conversion system. When the output current is large, the saturation current of the inductor is large, and the volume of the inductor is also large; it is obviously not suitable for portable applications due to space constraints. , it is necessary to use a small inductance, the peak current of a small inductance is small, and the heat is more serious when the load is heavy, so the output power ratio of a single DCDC module is limited

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