Charging apparatus
First Claim
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1. A charging apparatus, comprising:
- a charging voltage output unit that outputs a charging voltage which is a voltage to charge a battery for an electric power tool, to the battery;
a duty ratio setting unit that sets a duty ratio of a PWM signal based on a target charging voltage which is a target voltage for the charging voltage;
a PWM signal output unit that outputs the PWM signal having the duty ratio set by the duty ratio setting unit;
a reference voltage generation unit that generates a reference voltage for determining whether or not the charging voltage has reached the target charging voltage, by smoothing the PWM signal outputted from the PWM signal output unit;
a reference voltage limit unit that limits at least one of a maximum value and a minimum value of the reference voltage generated by the reference voltage generation unit;
a detected voltage generation unit that detects the charging voltage outputted from the charging voltage output unit and generates a detected voltage which is a voltage in accordance with a result of the detection; and
a charging voltage control unit that controls the charging voltage outputted from the charging voltage output unit based on the detected voltage and the reference voltage.
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Abstract
A charging apparatus includes: a charging voltage output unit; a duty ratio setting unit; a PWM signal output unit; a reference voltage generation unit; a reference voltage limit unit; a detected voltage generation unit; and a charging voltage control unit. The reference voltage generation unit generates a reference voltage for determining whether or not a charging voltage has reached a target charging voltage, by smoothing a PWM signal outputted from the PWM signal output unit. The reference voltage limit unit limits at least one of a maximum value and a minimum value of the reference voltage generated by the reference voltage generation unit.
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Citations
11 Claims
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1. A charging apparatus, comprising:
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a charging voltage output unit that outputs a charging voltage which is a voltage to charge a battery for an electric power tool, to the battery; a duty ratio setting unit that sets a duty ratio of a PWM signal based on a target charging voltage which is a target voltage for the charging voltage; a PWM signal output unit that outputs the PWM signal having the duty ratio set by the duty ratio setting unit; a reference voltage generation unit that generates a reference voltage for determining whether or not the charging voltage has reached the target charging voltage, by smoothing the PWM signal outputted from the PWM signal output unit; a reference voltage limit unit that limits at least one of a maximum value and a minimum value of the reference voltage generated by the reference voltage generation unit; a detected voltage generation unit that detects the charging voltage outputted from the charging voltage output unit and generates a detected voltage which is a voltage in accordance with a result of the detection; and a charging voltage control unit that controls the charging voltage outputted from the charging voltage output unit based on the detected voltage and the reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification