US3812408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trash masher motor control
Assignee: Dart Controls Inc
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Filing: 1973-05-14
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Granted: 1974-05-21
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Expires: 1993-05-14
Abstract
Abstract A system for controlling a direct current reversible motor comprising a Triac for controlling the flow of current through the motor, a gating circuit for providing a forward gating current to the gate of the Triac, a flip-flop for drawing the forward gating current away from the gate when the flip-flop is conductive, a control for rendering the flip-flop conductive, and a slaving circuit for drawing current out of the Triac gate when current flow in the forward direction through the Triac is clocked. The slaving circuit includes a resistor-capacitor network connected between the anode of the Triac and its gate such that a charge is built up on the capacitor by a positive current cycle on the anode when the Triac is non-conductive in the forward direction to be discharged by current flow away from the gate when the subsequent negative cycle appears on the anode. The slaving circuit also includes diodes for directing current flow from the gate during discharge of the capacitor. The control for rendering the flip-flop conductive includes a network for sensing the level of current flowing through the motor and providing a control voltage proportional to the current, the flip-flop being rendered conductive when the control voltage reaches a predetermined level.
Inventors
- 👤 P Penn
- 👤 J Waymire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:23
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14; H02P29/00; H02P29/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
331 words
A system for controlling a direct current reversible motor comprising first circuit means for connecting one side of said motor to one side of an alternating current power source, second circuit means for connecting the other side of said motor to the other side of said alternating current power source, said second circuit means including a Triac connected in series between said other side of said motor and said other side of said alternating current power source, said Triac having a gate control electrode effective to render said Triac conductive to pass positive current in a forward direction from said one side of said power source therethrough when a positive forward gating current is applied to said electrode while a positive cycle is on said other side of said motor and to pass current in the opposite direction therethrough when current is drawn out of said electrode while a negative cycle is on said other side of said motor, a gating circuit for providing a positive forward gating current to said electrode, a flip-flop circuit connected across said power source and having alternative conductive and nonconductive states, a control for rendering said flip-flop circuit conductive, third circuit means for connecting said electrode to said flip-flop circuit so that the forward gating current is drawn away from said electrode when said flip-flop circuit is conductive, and fourth circuit means for drawing current out of said electrode, said fourth circuit means including resistance means and capacitance means connected between said other side of said motor and said electrode such that a charge is built up on said capacitance means by a positive current cycle on said other side of said motor when said Triac is nonconductive in said forward direction to be discharged by current flow away from said electrode when the subsequent negative cycle appears on said other side of said motor, said fourth circuit means also including diode means directing current flow from said electrode during discharge of said capacitance means.
Claim 2
Independent Claim
331 words
A system for controlling a direct current reversible motor comprising first circuit means for connecting one side of said motor to one side of an alternating current power source, second circuit means for connecting the other side of said motor to the other side of said alternating current power source, said second circuit means including a Triac connected in series between said other side of said motor and said other side of said alternating current power source, said Triac having a gate control electrode effective to render said Triac conductive to pass positive current in a forward direction from said one side of said power source therethrough when a positive forward gating current is applied to said electrode while a positive cycle is on said other side of said motor and to pass current in the opposite direction therethrough when current is drawn out of said electrode while a negative cycle is on said other side of said motor, a gating circuit for providing a positive forward gating current to said electrode, a flip-flop circuit connected across said power source and having alternative conductive and nonconductive states, a control for rendering said flip-flop circuit conductive, third circuit means for connecting said electrode to said flip-flop circuit so that the forward gating current is drawn away from said electrode when said flip-flop circuit is conductive, and fourth circuit means for drawing current out of said electrode, said fourth circuit means including resistance means and capacitance means connected between said other side of said motor and said electrode such that a charge is built up on said capacitance means by a positive current cycle on said other side of said motor when said Triac is nonconductive in said forward direction to be discharged by current flow away from said electrode when the subsequent negative cycle appears on said other side of said motor, said fourth circuit means also including diode means directing current flow from said electrode during discharge of said capacitance means.
Claim 3
Dependent Claim
74 words
The invention of claim 1 in which said flip-flop circuit includes an SCR having a gate control electrode effective to render said SCR conductive when a gating signal is applied thereto, said control for rendering said flip-flop circuit conductive including means for sensing the level of current flowing through said motor and providing to said SCR control electrode a proportional voltage, said sCR being rendered conductive when said proportional voltage reaches a predetermined level.
Claim 4
Dependent Claim
35 words
The invention of claim 2 in which said SCR is of the latching-type such that, once it is rendered conductive, it will remain conductive as long as a positive voltage is applied to its anode.
Claim 5
Dependent Claim
86 words
The invention of claim 1 in which said capacitance means and resistance means include a first resistor, capacitor and second resistor connected in series in the order recited between said other side of said motor and said electrode, said diode means including a first diode having its anode connected to the junction between said capacitor and second resistor and its cathode connected to ground, and another diode having its anode connected to ground and its cathode connected to the junction between said first resistor and capacitor.
Claim 6
Dependent Claim
31 words
The invention of claim 4 including a Diac connected between said electrode and second resistor and a second capacitor connected between ground and the junction of said Diac and second resistor.
Claim 7
Dependent Claim
27 words
The invention of claim 5 in which said third circuit means is connected between said flip-flop circuit and the junction of said Diac and said second capacitor.
Claim 8
Independent Claim
272 words
A system for controlling a direct current reversible motor comprising a Triac for controlling current flow from an alternating current source through said motor, said Triac being connected in series with said motor and having a first input terminal, a second input terminal and a gate control electrode, said electrode being effective to render said Triac conductive to pass positive current in a forward direction through said motor when a positive forward gating current is applied to said electrode while a positive cycle is on said first terminal and to pass current in the opposite direction through said motor when current is drawn out of said electrode while a negative cycle is on said first terminal, a gating circuit for providing a positive forward gating current to said electrode, a flip-flop having alternate conductive and nonconductive states, a control for rendering said flip-flop conductive, said flip-flop being connected to said electrode such that, when said flip-flop is conductive, the forward gating current is drawn away from said electrode, and a slaving circuit for drawing current out of said electrode when forward conduction through said Triac is blocked, said slaving circuit including resistance means and capacitance means connected between said first terminal and said electrode such that a charge is built up on said capacitance means by a positive current cycle on said first terminal when said Triac is nonconductive in said forward direction to be discharged by current flow away from said electrode when the subsequent negative cycle appears on said first terminal, said slaving circuit also including diode means directing current flow from said electrode during discharge of said capacitance means.
Claim 9
Independent Claim
272 words
A system for controlling a direct current reversible motor comprising a Triac for controlling current flow from an alternating current source through said motor, said Triac being connected in series with said motor and having a first input terminal, a second input terminal and a gate control electrode, said electrode being effective to render said Triac conductive to pass positive current in a forward direction through said motor when a positive forward gating current is applied to said electrode while a positive cycle is on said first terminal and to pass current in the opposite direction through said motor when current is drawn out of said electrode while a negative cycle is on said first terminal, a gating circuit for providing a positive forward gating current to said electrode, a flip-flop having alternate conductive and nonconductive states, a control for rendering said flip-flop conductive, said flip-flop being connected to said electrode such that, when said flip-flop is conductive, the forward gating current is drawn away from said electrode, and a slaving circuit for drawing current out of said electrode when forward conduction through said Triac is blocked, said slaving circuit including resistance means and capacitance means connected between said first terminal and said electrode such that a charge is built up on said capacitance means by a positive current cycle on said first terminal when said Triac is nonconductive in said forward direction to be discharged by current flow away from said electrode when the subsequent negative cycle appears on said first terminal, said slaving circuit also including diode means directing current flow from said electrode during discharge of said capacitance means.
Claim 10
Dependent Claim
83 words
The invention of claim 7 in which said capacitance means and resistance means includes a first resistor, capacitor and second resistor connected in series in the order recited between said first terminal and said electrode, said diode means including a first diode having its anode connected to the junction between said capacitor and second resistor and its cathode connected to ground and another diode having its anode connected to ground and its cathode connected to the junction between said first resistor and capacitor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |