Power supply and image forming apparatus equipped with power supply

An image forming apparatus, comprising:

• an image forming unit configured to form an image;
• and
• a power supply configured to supply power to the image forming unit,
• wherein the power supply comprises:
• a rectification unit configured to be able to switch a rectification method between a voltage doubler rectification method and a full-wave rectification method according to an input alternating voltage;
• two capacitive elements serially connected between lines from the rectification unit;
• a monitoring unit configured to monitor a first voltage applied between the lines between which the two capacitive elements are connected and a second voltage applied across one of the capacitive elements that is connected to a lower potential side of the lines;
• and
• a switch configured to operate according to the second voltage, and
• wherein the power supply interrupts the alternating voltage according to an operating state of the switch, the first voltage, and the second voltage.

A power supply, comprising:

• a rectification unit configured to be able to switch a rectification method between a voltage doubler rectification method and a full-wave rectification method according to an input alternating voltage;
• a switching unit configured to switch the rectification method of the rectification unit;
• two capacitive elements serially connected between output lines from the rectification unit;
• and
• a monitoring unit configured to monitor a first voltage applied between the output lines between which the two capacitive elements are connected and a second voltage applied across one of the capacitive elements that is connected to a lower potential side of the lines,
• wherein the power supply interrupts the alternating voltage according to a monitored result obtained by the monitoring unit.

An image forming apparatus, comprising:

• an image forming unit configured to form an image;
• and
• a power supply configured to supply power to the image forming unit,
• wherein the power supply comprises:
• a rectification unit configured to be able to switch a rectification method between a voltage doubler rectification method and a full-wave rectification method according to an input alternating voltage;
• a switching unit configured to switch the rectification method of the rectification unit;
• two capacitive elements serially connected between output lines from the rectification unit;
• and
• a monitoring unit configured to monitor a first voltage applied between the output lines between which the two capacitive elements are connected and a second voltage applied across one of the capacitive elements that is connected to a lower potential side of the lines, and
• wherein the power supply interrupts the alternating voltage according to a monitored result obtained by the monitoring unit.