Speed control circuit of a direct current motor
AssigneeMakita Corporation
InventorsJohn Capps, Yutaka Matsunaga
Life of this patent
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Abstract
A speed control circuit of a direct current motor comprises a switching regulator IC 10. The switching regulator IC 10 is composed of a reference voltage generator 12 which generates a reference voltage of 5V, a first operational amplifier OP1, a second operational amplifier OP2, a third operational amplifier OP3, a triangular wave generator 14 which generates a triangular wave, and a transistor TR1. The speed control circuit is constructed using a general switching regulator IC; therefore, it is possible to cheaply and readily manufacture the speed control circuit of the direct current motor.
Claims4
A speed control circuit of a direct current motor, which applies a voltage of battery so as to control a rotational speed of a direct current motor of an electric powered tool, comprising:
- a switching regulator IC generating a variable potential in accordance with a first command potential applied to a first input and a second command potential applied to a second input;
- an electrically energizing control element connected to an output side of said switching regulator IC, and turning on and off a current to said direct current motor from said battery;
- a first command potential applying device applying a potential corresponding to a (dial) setting value to said first input side;
- and
- a second command potential applying device applying a potential corresponding to a pulled position of a trigger of electric powered tool to said second input side.
A speed control circuit of a direct current motor, which applies a voltage of battery so as to control a rotational speed of a direct current motor of an electric powered tool, comprising:
- a switching regulator IC generating a variable potential in accordance with a command potential;
- an electrically energizing control element connected to an output side of said switching regulator IC, and turning on and off a current to said direct current motor from said battery;
- a command potential applying device connected to an input side of said switching regulator IC, and applying a potential corresponding to a (dial) setting value;
- and
- a second command potential applying device applying a potential corresponding to a pulled position of a trigger of said electric powered tool to a second input side of said switching regulator IC.
Dependencies are inferred from the claim text.