JP2013236435A5 - - Google Patents

Claims (14)

A step-down circuit including a step-down switching element for stepping down an input voltage, a step-up circuit including a step-up switching element for stepping up the input voltage, a smoothing reactor connecting the step-down circuit and the step-up circuit, and an input of the step-down circuit A main circuit composed of an input smoothing capacitor provided on the output circuit and an output smoothing capacitor provided on the output of the booster circuit;
Taking in the input voltage and current of the main circuit, taking in the target value of the input voltage and current, and / or taking in the output voltage and current of the main circuit, and taking in the target value of the output voltage and current, A comparator that compares a current power conversion state calculated from the captured voltage and current value with a target power conversion state calculated from the target value of the captured voltage and current value;
Both the on-duty of the step-down circuit and the on-duty of the step-up circuit can be calculated, and a function is generated in which both the step-down switching element of the step-down circuit and the step-up switching element of the step-up circuit do not switch simultaneously. A first controller;
A second controller for calculating an on-duty of the step-down circuit from the generated function;
A third controller for calculating an on-duty of the booster circuit from the generated function;
A step-up / step-down DC / DC converter comprising a step-down switching element of the step-down circuit and a control circuit that controls switching of the step-up switching element of the step-up circuit. 2. The step-up / step-down DC / DC converter according to claim 1, wherein the control circuit generates the function in which an on-duty of the step-down circuit is necessarily larger than an on-duty of the step-up circuit. An AC generator and a rectifier that rectifies the output of the AC generator are connected to an input of the step-down circuit that is an input side of the main circuit, and an electric storage device and a load are connected to an output of the boost circuit that is an output side of the main circuit The step-up / step-down DC / DC converter according to claim 1 or 2, wherein: 4. The step-up / step-down DC / DC converter according to claim 3, wherein the control circuit shorts the output of the AC generator by simultaneously setting the on-duty of the step-down circuit and the on-duty of the step-up circuit to 1. 5. 4. The step-up / step-down DC / DC converter according to claim 3, wherein the control circuit raises an input voltage of the main circuit to raise an output voltage of the AC generator to an open circuit voltage of the AC generator. Wherein the control circuit, the buck-boost DC / DC converter according to claim 3 in which the input voltage is provided the duty limiter for limiting to avoid high Kunara Ri by setting voltage set beforehand in the main circuit. Wherein the control circuit, the buck-boost DC / DC converter according to claim 3 in which the input voltage is provided the duty limiter for limiting to avoid low Kunara Ri by setting voltage set beforehand in the main circuit. 2. The step-up / step-down DC / DC converter according to claim 1, wherein a storage device is connected to an input of the step-down circuit that is an input side of the main circuit, and a load is connected to an output of the step-up circuit that is an output side of the main circuit. . The step-up / step-down DC / DC converter according to claim 8, wherein the control circuit controls an on-duty of the step-down circuit and an on-duty of the step-up circuit so as not to be 1 simultaneously. 9. The step-up / step-down DC / DC converter according to claim 8, wherein the control circuit simultaneously sets the on-duty of the step-down circuit and the on-duty of the step-up circuit to 0, thereby reducing the power supplied from the power storage device to zero. Wherein the control circuit, the buck-boost DC / DC converter according to claim 8 in which the input voltage is provided a duty limiter for limiting to avoid high Kunara Ri by setting voltage set beforehand in the main circuit. Wherein the control circuit, the buck-boost DC / DC converter according to claim 8 in which the input voltage is provided a duty limiter for limiting to avoid low Kunara Ri by setting voltage set beforehand in the main circuit. The step-down circuit further includes a step-down synchronous rectification switching element connected in series with the step-down switching element, and the control circuit drives the step-down synchronous rectification switching element so as to repeat ON / OFF complementarily with the step-down switching element. The step-up / step-down DC / DC converter according to claim 1, further comprising a circuit. The step-up circuit further includes a step-up synchronous rectification switching element connected in series with the step-up switching element, and the control circuit drives the step-up synchronous rectification switching element so as to repeat ON / OFF complementarily with the step-up switching element. The step-up / step-down DC / DC converter according to claim 1, further comprising a circuit.