DC synthesis maximal power matching circuit and digital control method thereof

Abstract

The invention discloses a DC synthesis maximal power matching circuit and a digital control method thereof. The method comprises that S1) it is supposed that n=0, the duty ratio is controlled as 0, and an equivalent input voltage VI is detected; S2) a theoretical duty ratio is calculated, and the duty ratio is controlled as the theoretical duty ratio; S3) the equivalent input voltage is detected and recorded; S4) whether the equivalent input voltage is within the interval of [1 / 2VI-alpha, 1 / 2VI+alpha] is determined, if NO, a step S5) is turned to, and otherwise, a step S6) is turned to; S5) whether the equivalent input voltage is greater than 1 / 2 VI is determined, if YES, the duty ratio is increased and the step S3) is returned to, and otherwise, the duty ratio is decreased and the step S3) is returned to; and S6) the duty ratio at this time is recorded as Dn, whether the duty ratio Dn is within the interval of [D0-beta, D0+beta] is determined, if YES, it is supposed that n=n+1 and thestep S3) is returned to, and otherwise, the step S1) is returned to. According to the circuit and method, the difficulty in tracking the maximal power due to a DC synthesis circuit is micro and cannot be measured accurately is overcome, the circuit and method are not limited to a Boost topology structure, and requirement of maximal power matching and transmitting of different low-power circuits can be met.

Description

technical field [0001] The invention belongs to the technical field of millimeter wave wireless energy transmission, and in particular relates to a DC synthesis maximum power matching circuit and a digital control method thereof. Background technique [0002] The transmission power of the millimeter-wave wireless energy transmission system is large, and the number of rectification output terminals is large. The output voltage is unstable, and the output voltage range of each rectification antenna is wide, and the power is very small. It is difficult for the DC voltage regulator circuit to synthesize the transmitted power. larger. [0003] The theoretical research on the voltage-controlled Boost conversion circuit is quite mature. The equivalent input impedance of the independent converter circuit can be adjusted and changed by adjusting the on-off time of the switch. According to the principle of the dual-port network of the circuit, after the battery load is connected to th...

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Problems solved by technology

In order to flexibly adjust the load equivalent resistance value, in the DC synthesis circuit, a scheme of replacing the load here with a complex and controllable Boost circuit is proposed, and the present invention judges whether it is by detecting the effective input voltage of the converter circuit. Half of the detection value of the voltage source; by adjusting the switch duty cycle of the converter to ensure that the effective input voltage is always half of the voltage source voltage, to achieve the maximum power matching transmission, so as to solve the problem that the DC synthesis current is small and cannot be solved in the millimeter wave wireless energy transmission system The Difficulty of Accurate Measurements for Maximum Power Tracking

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