Trigger diode controlled motor starting system

Claim 2

In a motor system including a run winding, a start winding and an A. C. supply, a speed responsive motor starting circuit comprising: a bilateral triode switch having two power electrodes and a control electrode, said power electrodes being connected in series with said start winding; a capacitor; means for charging said capacitor; a first bilateral trigger diode, a first electrode of which is connected to the control electrode of said triode switch and a second electrode of which is connected to said capacitor, said first bilateral trigger diode being responsive to a certain voltage applied to said second electrode for conducting gating current from said capacitor to said control electrode; curRent sensing means responsive to the current flowing through said run winding for generating a voltage; and means responsive to the voltage generated by said current sensing means for applying a voltage to said second electrode, said voltage applying means comprising first resistive means connected to said current sensing means and a second bilateral trigger diode, a first electrode of which is connected to said first resistive means and a second electrode of which is connected in circuit with the second electrode of said first bilateral trigger diode.

Claim 3

The circuit of claim 1 wherein said voltage applying means further comprises second resistive means interconnecting the first electrode of said second bilateral trigger diode with one terminal of said A. C. supply.

Claim 4

In a motor system including a run winding, a start winding and an A. C. supply, a speed responsive motor starting circuit comprising: a bilateral triode switch having two power electrodes and a control electrode, said power electrodes being connected in series with said start winding; a capacitor; a first bilateral trigger diode, a first electrode of which is connected to the control electrode of said triode switch and a second electrode of which is connected to said capacitor, said first bilateral trigger diode being responsive to a certain voltage applied to said second electrode for conducting gating current from said capacitor to said control electrode; current sensing means responsive to the current flowing through said run winding for generating a voltage; means responsive to the voltage generated by said current sensing means for applying a voltage to said second electrode; and means for charging said capacitor and for advancing the phase angle of the voltage applied by said voltage applying means to the second electrode of said first bilateral trigger diode to thereby reduce the notch effect in the current flowing through said start winding.

Claim 5

In a motor system including a run winding, a start winding and an A. C. supply, a speed responsive motor starting circuit comprising: a bilateral triode switch having two power electrodes and a control electrode, said power electrodes being connected in series with said start winding; a capacitor; a first bilateral trigger diode, a first electrode of which is connected to the control electrode of said triode switch and a second electrode of which is connected to said capacitor, said first bilateral trigger diode being responsive to a certain voltage applied to said second electrode for conducting gating current from said capacitor to said control electrode; current sensing means responsive to the current flowing through said run winding for generating a voltage; means responsive to the voltage generated by said current sensing means for applying a voltage to said second electrode; and means for charging said capacitor and for advancing the phase angle of the voltage applied by said voltage applying means to the second electrode of said first bilateral trigger diode to thereby reduce the notch effect in the current flowing through said start winding.

Claim 6

The circuit of claim 3 wherein said capacitor charging and phase angle advancing means comprises a second capacitor and a first resistor connected in series and interconnecting said voltage applying means and one terminal of said A. C. supply with the second electrode of said first bilateral trigger diode.

Claim 7

The circuit of claim 4 wherein said capacitor charging and phase angle advancing means further comprises a third capacitor and a second resistor connected in series and interconnecting said one terminal of said A. C. supply with said voltage applying means and with said second capacitor and first resistor.

Claim 8

A speed responsive motor starting circuit for use with motor systems which include a run winding, a start mechanism, and an A. C. power supply, said circuit comprising: a bilateral triode switch whose power electrodes are connected in series with said start mechanism; a first bilateral trigger diode for applying current to the control electrode of said triode switch in response to a triggering voltage supplied to one electrode of said first bilateral trigger diode to thereby enable said triode switch to conduct current between its power electrode; means for supplying a triggering voltage to said one electrode of said first bilateral trigger diode, the amplitude of said triggering voltage corresponding to a voltage induced across said voltage supplying means; current sensing means coupled in circuit with said run winding for inducing a voltage across said voltage supplying means proportional to the amplitude of the current flowing through said run winding; and means for supplying current to said first bilateral trigger diode comprising a first capacitor connected to said one electrode of said first bilateral trigger diode, a second capacitor and a first resistor connected in series with said one electrode of said first bilateral trigger diode for advancing the phase angle of the triggering voltage supplied to said one electrode of said first bilateral trigger diode, and a third capacitor and a second resistor connected in series and interconnecting said second capacitor and first resistor in series with one terminal of said A. C. power supply for further advancing the triggering voltage supplied to said one electrode of said first bilateral trigger diode.

Claim 9

A speed responsive motor starting circuit for use with motor systems which include a run winding, a start mechanism, and an A. C. power supply, said circuit comprising: a bilateral triode switch whose power electrodes are connected in series with said start mechanism; a first bilateral trigger diode for applying current to the control electrode of said triode switch in response to a triggering voltage supplied to one electrode of said first bilateral trigger diode to thereby enable said triode switch to conduct current between its power electrode; means for supplying a triggering voltage to said one electrode of said first bilateral trigger diode, the amplitude of said triggering voltage corresponding to a voltage induced across said voltage supplying means; current sensing means coupled in circuit with said run winding for inducing a voltage across said voltage supplying means proportional to the amplitude of the current flowing through said run winding; and means for supplying current to said first bilateral trigger diode comprising a first capacitor connected to said one electrode of said first bilateral trigger diode, a second capacitor and a first resistor connected in series with said one electrode of said first bilateral trigger diode for advancing the phase angle of the triggering voltage supplied to said one electrode of said first bilateral trigger diode, and a third capacitor and a second resistor connected in series and interconnecting said second capacitor and first resistor in series with one terminal of said A. C. power supply for further advancing the triggering voltage supplied to said one electrode of said first bilateral trigger diode.

Claim 10

The circuit of claim 6 wherein said voltage supplying means comprises a voltage divider connected to said current sensing means, and a second bilateral trigger diode, a first electrode of which is connected to the junction connecting said second capacitor and first resistor with said third capacitor and second resistor and a second electrode of which is connected to said voltage divider.

Claim 11

The circuit of claim 7 wherein said voltage divider comprises a first resistor interconnecting said current sensing means and the second electrode of said second bilateral trigger diode and a second resistor interconnecting the second electrode of said second bilateral trigger diode with the other terminal of said A. C. supply.

Claim 12

The circuit of claim 8 wherein said current sensing means comprises a transformer having a first winding connected in series with said run winding and a second winding interconnecting said first resistor with said other terminal of said A. C. supply.