CHARGING APPARATUS
First Claim
1. A charging apparatus having a charging element connected between a DC power supply and a capacitor for charging the capacitor with the DC power supply through the charging element, comprising:
- a constant-voltage-control-circuit for controlling a charging voltage to the capacitor to be constant;
a current detecting portion for detecting a charging current in a charging path from the DC power supply to the capacitor;
a voltage detecting portion for detecting a difference between a voltage of the capacitor and a voltage corresponding to the DC power supply; and
an integrator for integrating output signals of the current detecting portion and the voltage detecting portion, whereinthe capacitor is charged by controlling power of the charging element to a predetermined value using an output signal of the integrator, andthe capacitor is charged up to a predetermined voltage with the charging element controlled by the constant-voltage-control-circuit.
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Accused Products
Abstract
A charging apparatus suppresses rise in temperature of an internal chip of a charging element. The output signal obtained from a current detecting portion for detecting charging current to a capacitor and from a voltage detecting portion for detecting a difference between a voltage (VC) of capacitor and a voltage corresponding to DC power supply is integrated by integrator. The charging is carried out by controlling power of a charging element to a predetermined value using an output signal of the integrator and at a time near the completion of the charging, the charging element is controlled by constant-voltage-control-circuit so as to charge the capacitor up to a predetermined voltage. Consequently, the maximum temperature inside the charging element is reduced, thereby providing a charging apparatus with high reliability.
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Citations
12 Claims
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1. A charging apparatus having a charging element connected between a DC power supply and a capacitor for charging the capacitor with the DC power supply through the charging element, comprising:
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a constant-voltage-control-circuit for controlling a charging voltage to the capacitor to be constant; a current detecting portion for detecting a charging current in a charging path from the DC power supply to the capacitor; a voltage detecting portion for detecting a difference between a voltage of the capacitor and a voltage corresponding to the DC power supply; and an integrator for integrating output signals of the current detecting portion and the voltage detecting portion, wherein the capacitor is charged by controlling power of the charging element to a predetermined value using an output signal of the integrator, and the capacitor is charged up to a predetermined voltage with the charging element controlled by the constant-voltage-control-circuit. - View Dependent Claims (2, 4, 5, 8)
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3. A charging apparatus having a charging element connected in series between a DC power supply and a capacitor for charging the capacitor with the DC power supply through the charging element, comprising:
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a constant-voltage-control-circuit for controlling a charging voltage to the capacitor to be constant; a current detecting portion for detecting a charging current in a charging path from the DC power supply to the capacitor; a current limiting portion for controlling a charging current to the capacitor; a voltage detecting portion for detecting a difference between a voltage of the capacitor and a voltage corresponding to the DC power supply; and an integrator for integrating output signals of the current detecting portion and the voltage detecting portion, wherein the capacitor is charged by controlling power of the charging element to a predetermined value using an output signal of the integrator, and the current limiting portion charges the capacitor to a predetermined voltage by limiting the maximum value of the charging current, and the constant-voltage-control-circuit charges the capacitor up to a predetermined voltage by controlling the charging element. - View Dependent Claims (9, 10, 11)
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6. A charging apparatus having a structure in which a plurality of charging elements are connected in parallel between a DC power supply and a capacitor to charge the capacitor by the DC power supply through the charging element, comprising:
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a current detecting portion for detecting a charging current in a charging path from the DC power supply to the capacitor; a constant-current-control-circuit for controlling the charging current to the capacitor to be constant; a constant-voltage-control-circuit for controlling a charging voltage to the capacitor; a capacitor voltage detecting portion for detecting a voltage of the capacitor; a current switching portion for switching a current of the constant-current-control-circuit to a plurality of currents; and a plurality of switches for transmitting a charge control signal for controlling the charging element to each of the charging elements, wherein when the charging element is controlled by an output signal of the constant-current-control-circuit, the switches are switched in sequence and the plurality of charging currents are switched based on an output of the capacitor voltage detecting portion to charge the capacitor such that an average power of the charging element during a charging process is constant, and the capacitor is charged up to a predetermined voltage by controlling the charging element using the constant-voltage-control-circuit. - View Dependent Claims (7, 12)
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Specification