TRANSISTOR INVERTER CIRCUIT

• US 3,568,038 A
• Filed: 03/28/1969
• Issued: 03/02/1971
• Est. Priority Date: 03/28/1969
• Status: Expired due to Term

• Current Assignee: Henri H. Hoge, Ray H. Enders, Robert E. Lewis
• Original Assignee: Henri H. Hoge, Ray H. Enders, Robert E. Lewis
• Inventors: Enders, Ray H., Hoge, Henri H., Lewis, Robert E.
• Application Number:
  US04/811,520
• Time in Patent Office: 704 Days
• US Class Current: 363/131
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02M 3/3381 using a single commutation path
• CPC Class Codes: H02M 3/3384 of the parallel type

Abstract

A transistor circuit capable of receiving a high voltage, low frequency supply and changing it to a low voltage high frequency supply.

Claims

1. A transistor inverter circuit including a transistor, a DC current supply, a first coil in the collector-emitter circuit of said transistor and connected with said DC current supply, a second coil in the base-emitter circuit of said transistor within the filed of said first coil, first DC current flow in the baseemitter circuit of said transistor, first means for initiating said first current flow, second current flow from said DC current supply in the collector-emitter circuit of said transistor responsive to said first current flow, first flux generated in said first coil by said second current flow, a first voltage induced in said second coil by said first flux, said first voltage increasing the value of said first current flow whereby the value of said second cUrrent flow is increased, a predetermined substantially constant level of second current flow, second means for causing said second current flow to be restricted to said constant level, said first flux field beginning to decrease at said constant level of said second current flow, said decrease in said first flux field causing a reversal in polarity of said first voltage and cutoff of said transistor, and load means operatively connected to said second coil and supplied by current generated by the voltage developed across said second coil.

2. A transistor inverter circuit in accordance with claim 1 in which said first coil is wound on a saturable core which provides the means for causing said second current flow to be restricted to said constant level at core saturation.

3. A transistor inverter circuit in accordance with claim 1 in which a capacitor is provided in the collector-emitter circuit of said transistor having one terminal thereof connected between the collector of said transistor and said first coil and the remaining terminal thereof connected to ground whereby upon the transistor being turned off energy stored in said first coil is released.

4. A transistor inverter circuit in accordance with claim 1 in which the means for initiating said first current flow is current from said DC current supply.

5. A circuit for changing an AC input voltage to a DC current including a transistor oscillator, a transformer core of said oscillator, a first rectifier receiving said AC input voltage, a resistor coupling the output current of said first rectifier to said oscillator as a DC supply, a second rectifier, said second rectifier having input coils wound on said transformer core for coupling with said oscillator and a DC load supplied by the output of said second rectifier, first switching means for changing the resistance of said resistor whereby the output current of said second rectifier is changed, and second switching means in said DC load and coupled to said first switching means whereby said DC load is changed simultaneously with said output circuit.

6. A transistor inverter circuit including in combination a transistor, a first coil in the collector-emitter circuit of said transistor, a second coil in the base-emitter circuit of said transistor and positioned to be within the flux field of said first coil, a resistor connected to the base of said transistor to provide a supply current path thereto, and load means operatively connected to said second coil and supplied by current generated by the voltage developed across said second coil and a capacitor connected at one end between said first coil and the collector of said transistor to provide a path to ground.

7. A transistor inverter circuit including in combination first and second transistors, first and second coils, said first coil being connected at its one end to the base of said first transistor and at its remaining end to said second coil, said second coil being connected at its remaining end to the base of said second transistor, a first resistor connected at one end to said first and second coils whereat said coils are connected to each other to provide a path to ground, a second resistor connected at one end to said first and second coils whereat said coils are connected to each other to provide a supply current path, third and fourth coils, said third coil being connected at its one end to the collector of said first transistor and at its remaining end to said fourth coil, said fourth coil being connected at its remaining end to the collector of said second transistor, said second resistor being connected at its remaining end to said third and fourth coils whereat said coils are connected to each other, said coils being wound on the same core.

8. A transistor inverter circuit including a transistor, a DC current supply, a first coil in the collector-emitter circuit of said transistor and connected with said DC current supply, a second coil in the base-emitter circuit of said transistor within the field of said first coil, first DC current flow in the base-emitter circuit of said transistor, first means for initiating said first current flow, second current flow from said DC current supply in the collector-emitter circuit of said transistor responsive to said first current flow, first flux generated in said first coil by said second current flow, a first voltage induced in said second coil by said first flux, said first voltage increasing the value of said first current flow whereby the value of said second current flow is increased, a predetermined substantially constant level of second current flow, second means for causing said second current flow to be restricted to said constant level, said first flux field beginning to decrease at said constant level of said second current flow, said decrease in said first flux field causing a reversal in polarity of said first voltage and cutoff of said transistor, a battery, and means for rectifying the current generated by the voltage developed across said second coil and feeding it to charge said battery.

9. A transistor inverter circuit in accordance with claim 8 in which a motor is provided and switching means whereby said motor is placed in circuit parallel with said battery.