US 2019/0283401 A1 · CAPACITIVE LOAD DRIVING CIRCUIT AND IMAGE FORMING APPARATUS

Abstract

A capacitive load driving circuit includes a first switching element, a second switching element, a third switching element, a fourth switching element and voltage dropper elements. The first switching element is provided on a first charging path extending from a power supply to a capacitive load. The second switching element is provided on a second charging path extending from a capacitor to the capacitive load. The third switching element is provided on a first discharging path extending from the capacitive load to a ground. The fourth switching element is provided on a second discharging path extending from the capacitive load to the capacitor. The voltage dropper elements are provided on each of control signal power supply paths to the first switching element, to the second switching element, to the third switching element and to the fourth switching element. The voltage dropper elements are configured to make electric current flow more easily through the second charging path than through the first charging path when charging the capacitive load and to make electric current flow more easily through the second discharging path than through the first discharging path when discharging the capacitive load by a potential difference.

Claims16

Dependent claims

A capacitive load driving circuit comprising:

a first switching element that is provided on a first charging path extending from a power supply to a capacitive load;
a second switching element that is provided on a second charging path extending from a capacitor to the capacitive load;
a third switching element that is provided on a first discharging path extending from the capacitive load to a ground;
a fourth switching element that is provided on a second discharging path extending from the capacitive load to the capacitor;
and
voltage dropper elements that are provided on each of control signal power supply paths to the first switching element, to the second switching element, to the third switching element and to the fourth switching element and that are configured to make electric current flow more easily through the second charging path than through the first charging path when charging the capacitive load and to make electric current flow more easily through the second discharging path than through the first discharging path when discharging the capacitive load by a potential difference.

3 more elements

A capacitive load driving circuit for charging and discharging a capacitive load repeatedly based on a control signal, the capacitive load driving circuit comprising:

a first switching element that is interposed on a first charging path through which electric current flows from a charging power supply to the capacitive load, the charging power supply being configured to charge the capacitive load;
a second switching element that is interposed on a second charging path through which electric current flows from a capacitor to the capacitive load, the electric current being rectified by a first back flow preventing diode;
a third switching element that is interposed on a first discharging path through which electric current flows from the capacitive load to a ground;
a fourth switching element that is interposed on a second discharging path through which electric current flows from the capacitive load to the capacitor, the electric current being rectified by a second back flow preventing diode;
a first voltage dropper element that is provided between the first switching element and the second switching element on a voltage input path to a control terminal configured to indicate an on-state based on an input signal;
and
a second voltage dropper element that is provided between the third switching element and the fourth switching element on a voltage input path to a control terminal configured to indicate an on-state based on an input signal,
wherein a control terminal of the first switching element is connected to a low potential side of the first voltage dropper element,
a control terminal of the second switching element is connected to a high potential side of the first voltage dropper element,
a control terminal of the third switching element is connected to a low potential side of the second voltage dropper element, and
a control terminal of the fourth switching element is connected to a high potential side of the second voltage dropper element.

8 more elements

Dependencies are inferred from the claim text.

Capacitive load driving circuit and image forming apparatus

Life of this patent

Capacitive load driving circuit and image forming apparatus

Life of this patent

Abstract

Claims16