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Electric apparatus and residual electric charge discharging method

A technology for electrical devices and residual charges, applied to electrical components, electrical recording technology using charge patterns, equipment using electrical recording technology using charge patterns, etc., can solve the problems of not considering the residual charge of the power circuit and the inability to prevent inrush current, etc.

Active Publication Date: 2015-07-29
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in Patent Document 1, the discharge action of the residual charge in the capacitor connected in parallel with the driving load directly depends on the operation of the user to open or close the door cover. The problem of inrush current may occur
[0006] In addition, Patent Document 1 does not consider the residual charge generated by the power supply circuit, and when such residual charge occurs, the occurrence of inrush current cannot be prevented.

Method used

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  • Electric apparatus and residual electric charge discharging method
  • Electric apparatus and residual electric charge discharging method
  • Electric apparatus and residual electric charge discharging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] This embodiment shows a basic form of a power supply circuit having a discharge circuit for discharging the residual charge of each of the power supply circuit and the load circuit when the relay is turned off to cut off the power supply.

[0039] figure 2 is the image forming apparatus of this embodiment (see figure 1 ) is a schematic diagram of the circuit structure for supplying power to a load via an on / off controllable relay.

[0040] Such as figure 2As shown, the power supply 20 incorporates a power conditioner and has a switch / converter 201 for outputting DC power. The power supply 20 also has a capacitive element 210 .

[0041] The pull unit 30 is a load circuit that requires power. The circuit of the drawing unit 30 has a capacitive element 310 . The circuit board 10 of the power supply circuit is provided with a capacitor 110, which is connected in parallel with the pull unit 30 as a load circuit, and is a capacitive element for stabilizing power supply...

Embodiment approach 2

[0072] This embodiment is a modification of the discharge circuit in the power supply circuit of Embodiment 1 described above as the basic form.

[0073] figure 2 The discharge circuit 130 in the power supply circuit according to Embodiment 1 is configured such that a resistor 130r on the power supply line on the input side of the relay 101 is connected to a FET 130s for switching with the output terminal of the relay 130 as GND.

[0074] exist figure 2 In the illustrated embodiment, the discharge circuit is formed with a resistor 130r and a FET 130s. Therefore, according to the difference in the amount of residual charge when the relay is turned off, the voltage level when discharging through the resistor 130r and the FET 130s is also different. When the amount of residual charge reaches the maximum, a large voltage is applied to the impedance 130r and the FET 130s, and the discharge current during discharge is also large.

[0075] For this reason, it is necessary to sel...

Embodiment approach 3

[0094] This embodiment changes the circuit for controlling the ON / OFF of the relay in the power supply circuit of the above-mentioned Embodiment 1 as a basic mode.

[0095] exist figure 2 In the power supply circuit of Embodiment 1 shown, the circuit for controlling the on / off of the relay 101 controls the on / off of the relay 101 by interlocking with the closing / unlocking of the front door cover 21 .

[0096] The interlock switch 21s is opened and closed according to the locking / opening of the front door cover 21, and accordingly, the transistor 103 performs switching operation on / off, and guides whether the relay 101 performs the driving operation of the electromagnetic coil, thereby turning on / off the relay. In short, the on / off of the relay 101 is linked to the manual locking / unlocking of the front door cover 21 .

[0097] figure 2 In the power supply circuit shown, the power supply from the switch / converter 201 of the power supply 20 to the circuit board 10 of the powe...

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Abstract

Example embodiments of the present invention include a power source; a load circuit; a relay provided between the power source and the load circuit; a rectifying circuit connected between an output terminal and an input terminal of the relay; a discharge circuit connected to the power source line on an input side of the relay and to perform, when turned on, discharging operation to discharge an electric charge that remains on each of the input side and an output side of the relay; and a discharge control circuit to turn on the discharge circuit to perform discharging operation when the relay is turned off to stop the power supply input to the load circuit.

Description

technical field [0001] The present invention relates to an electrical device that supplies power to a load circuit through a relay, and in detail relates to an electrical device with a residual charge discharge circuit. More specifically, it relates to an electrical device having a circuit for discharging residual charge stored in both an input terminal connected to a power source and an output terminal connected to a load circuit of the relay when the relay is turned off, and further relates to a method for discharging residual charge. Background technique [0002] In electrical devices that turn on / off the power supply using a relay or switch, etc., when the power is cut off by the relay, etc., residual charges are generated in the capacitive elements in the load circuit receiving the power supply, and then, when the power is turned on again, Inrush current due to residual charge occurs again. This inrush current is the cause of circuit malfunctions such as device malfunc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
CPCG03G15/80
Inventor 石井达也
Owner RICOH KK
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