Power supply apparatus and image forming apparatus

Abstract

The power supply apparatus includes an inductor; a switching element connected to another end of the inductor, the switching element configured to drive the inductor by being turned on or turned off in accordance with an input pulse signal; a boost converter circuit connected to both ends of the inductor and including a plurality of rectification units, the boost converter circuit configured to amplify a voltage generated in the inductor, each of the plurality of rectification units including a diode and a capacitor; and a voltage boosting element configured to supply a voltage obtained by boosting an input voltage to the inductor.

1 . A power supply apparatus comprising:
 an inductor having one end side where the inductor is connected to a ground and another end side where the inductor is connected on an opposite side to the ground;   a boost circuit connected to the inductor and including a plurality of rectification units including a diode and a capacitor;   a switching element connected on the one end side of the inductor;   a rectification element connected to the another end side of the inductor; and   a first capacitance element connected in parallel to the rectification element,   wherein in a case where the switching element is turned on and off, a time at which a voltage on the one end side of the inductor changes is different from a timing at which a voltage on the another end side of the inductor changes.   
     
     
         2 .- 17 . (canceled) 
     
     
         18 . The power supply apparatus according to  claim 1 , further comprising a second capacitance element connected between the another end side of the inductor and the ground. 
     
     
         19 . The power supply apparatus according to  claim 1 , wherein the voltage on the one end side of the inductor and the voltage on the another end side of the inductor vary with predetermined cycles, and the cycle in which the voltage on the another end side varies shifts from the cycle in which the voltage on one end side varies. 
     
     
         20 . The power supply apparatus according to  claim 19 , wherein the predetermined cycles shift by 180 degrees with each other. 
     
     
         21 . The power supply apparatus according to  claim 1 , wherein the diode includes an anode terminal connected to a voltage source and a cathode terminal connected to the one end side of the inductor. 
     
     
         22 . The power supply apparatus according to  claim 1 , wherein the rectification element includes a Zener diode, and the Zener diode includes an anode terminal connected to a voltage source and a cathode terminal connected to the one end side of the inductor. 
     
     
         23 . An image forming apparatus comprising:
 an image forming unit forming an image on a recording material; and   a power supply apparatus for supplying a power to the image forming unit, the power supply apparatus comprising:
 an inductor having one end side where the inductor is connected to a ground and another end side where the inductor is connected on an opposite side to the ground; 
 a boost circuit connected to the inductor and including a plurality of rectification units including a diode and a capacitor; 
 a switching element connected on the one end side of the inductor; 
 a rectification element connected to the another end side of the inductor; and 
 a first capacitance element connected in parallel to the rectification element, 
 wherein in a where case the switching element is turned on and off, a timing at which a voltage on the one end side of the inductor changes is different from a timing at which a voltage on the another end side of the inductor changes. 
   
     
     
         24 . The image forming apparatus according to  claim 23 , wherein the power supply apparatus further comprises a second capacitance element connected between the another end side of the inductor and the ground. 
     
     
         25 . The image forming apparatus according to  claim 23 , wherein the voltage on the one end side of the inductor and the voltage on the another end side of the inductor vary with predetermined cycles wherein the voltage on the one end side of the inductor and the voltage on the another end side of the inductor vary with predetermined cycles, and the cycle in which the voltage on the another end side varies shifts from the cycle in which the voltage on one end side varies. 
     
     
         26 . The image forming apparatus according to  claim 25 , wherein the predetermined cycles shift by 180 degrees with each other. 
     
     
         27 . The image forming apparatus according to  claim 23 , wherein the diode includes an anode terminal connected to a voltage source and a cathode terminal connected to the one end side of the inductor. 
     
     
         28 . The image forming apparatus according to  claim 23 , wherein the rectification element includes a Zener diode, and the Zener diode includes an anode terminal connected to a voltage source and a cathode terminal connected to the one end side of the inductor. 
     
     
         29 . The image forming apparatus according to  claim 23 , wherein the image forming unit includes any one of:
 a charging device configured to charge an image bearing member;   a developing device configured to develop a latent image formed on the image bearing member as an image with toner; and   a transfer device configured to transfer the image formed on the image bearing member onto a transfer member.