| 摘要 |
A power supply device that is able to switch between rectifier circuits in accordance with the voltage of a multi-phase AC power supply, and able to accommodate different power supply voltages. The power supply device has rectifier circuits that include a first circuit that rectifies a line voltage of the AC power supply, converting it into a direct current voltage of a first predetermined value, when the voltage of the AC power supply is a predetermined value or less, and a second circuit that rectifies a phase voltage of the AC power supply, converting it into a direct current voltage of a second predetermined value, when the voltage of the alternating current power supply exceeds the predetermined value. The first and second circuits operate in such a way that the AC input current is of the same phase as the voltage of the AC power supply. |
| 主权项 |
1. A power supply device that converts the voltage of an alternating current power supply having N phases (N is a natural number of two or more) into a direct current voltage, comprising:
M (M is a natural number equal to or greater than one, and equal to or smaller than N) rectifier circuits, each rectifier circuit including:
a first alternating current input terminal connected to receive one predetermined phase of the alternating current power supply;a second alternating current input terminal connected to receive another predetermined phase of the alternating current power supply;a third alternating current input terminal connected to a neutral point of the alternating current power supply;positive side and negative side direct current output terminals;a first series circuit having first and second semiconductor switching elements that are connected in series;first and second diodes connected in reverse parallel to the first and second semiconductor switching elements respectively;a second series circuit having first and second thyristors that are connected in series;a third series circuit having third and fourth thyristors that are connected in series;a capacitor; andan inductor, wherein the first and second diodes form a further series circuit, wherein the first to third series circuits, the further series circuit, and the capacitor are connected in parallel between the positive side and negative side direct current output terminals, wherein the inductor is connected between the first alternating current input terminal and a connection point of the first semiconductor switching element and second semiconductor switching element of the first series circuit, and wherein each rectifier circuit operates in:
a first mode in which a line voltage of the alternating current power supply is converted into a direct current voltage of a first predetermined value by the first and second thyristors of the second series circuit being put into a conductive state and a non-conductive state in alternation, the third and fourth thyristors of the third series circuit both being put into a non-conductive state, one of the first and second semiconductor switching elements of the first series circuit being turned off continuously during operation in the first mode, the other of the first and second semiconductor switching elements being caused to perform an on-off operation during operation in the first mode, and an alternating current of the same phase as the line voltage of the alternating current power supply being input; anda second mode in which a phase voltage of the alternating current power supply is converted into a direct current voltage of a second predetermined value by the first and second thyristors of the second series circuit both being put into a non-conductive state, the third and fourth thyristors of the third series circuit being put into a conductive state and a non-conductive state in alternation, one of the first and second semiconductor switching elements of the first series circuit being turned off continuously during operation in the second mode, the other of the first and second semiconductor switching elements being caused to perform an on-off operation during operation in the second mode, and an alternating current of the same phase as the phase voltage of the alternating current power supply being input. |
