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A pulse width modulation control circuit includes a pulse width modulator which supplies a signal to a power switch tying together a DC signal generator and a motor and various sensing circuit including a control voltage disabler circuit. All of the sensing circuits are appropriately designed to ens

A pulse width modulation control circuit includes a pulse width modulator which supplies a signal to a power switch tying together a DC signal generator and a motor and various sensing circuit including a control voltage disabler circuit. All of the sensing circuits are appropriately designed to ensure that the various components of the circuit are not damaged under abnormal conditions whether due to motor loads heavier than rated or undesired changes in AC current input or control voltages.

대표청구항 ▼

A control circuit for operating and controlling a d.c. motor driven from an a.c. signal, said circuit comprising: (a) rectifier means, responsive to said a.c. signal and control signals applied thereto, for selectively generating a d.c. signal to said d.c. motor; (b) pulse width modulator means for

A control circuit for operating and controlling a d.c. motor driven from an a.c. signal, said circuit comprising: (a) rectifier means, responsive to said a.c. signal and control signals applied thereto, for selectively generating a d.c. signal to said d.c. motor; (b) pulse width modulator means for generating a pulse width modulated signal; said pulse width modulator means including: (i) means for generating a pulse train corresponding to a desired motor speed; (ii) means, responsive to said pulse train, for generating a square wave signal; and (iii) means, including a transformer and a bridge circuit, for rectifying said square wave signal into said pulse width modulated signal; (c) power switch means, responsive to said pulse width modulated signal, for selectively interrupting said d.c. signal to said motor.