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US 2016/0154386 A1Published application
Interlock circuit and image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorRyo Takayama
Life of this patent
Estimating the term…
Abstract
An interlock switch is turned on to close a power supply line when a cover is closed, and turned off to open the power supply line when the cover is opened. A time constant circuit is connected to a node side of the interlock switch in the power supply line. A switch control unit determines that a user is intentionally turning on and off the interlock switch and turns off a switch Q1 when a smoothed voltage obtained by smoothing a voltage difference between voltage dividing nodes becomes larger than a threshold value.
Claims5
An interlock circuit, comprising:
- a power supply line configured to supply a direct-current voltage supplied from a power supply unit to a load;
- an interlock switch configured to open and close the power supply line;
- a time constant circuit connected to the load side of the interlock switch in the power supply line and configured to delay a response of a power supply voltage to be applied to the power supply line when the interlock switch closes the power supply line;
- a first switch connected between the time constant circuit and the load;
- and
- a switch control unit configured to smooth a voltage difference of the interlock switch and turn off the first switch when an obtained smoothed voltage becomes larger than a threshold value.
3 more elements
Dependencies are inferred from the claim text.