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US 4,792,885 AGranted
Control device of the transistor bases of an inverter arm
AssigneeMerlin Gerin
InventorsSylvain Cuman, Philippe J. Moreau
Life of this patent
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Abstract
An inverter arm is made up of two transistors electrically connected in series, each transistor having its own independent control unit. The control units are supplied by a common power supply unit ensuring galvanic insulation by means of a transformer with two distinct secondary windings. This galvanic insulation allows a potential difference of several hundred volts between the transistors and their control circuit.
Claims8
A control device comprising:
- a first and a second bipolar transistor connected in series, and connectable between first and second conductors of a D.C. voltage supply, a center point between said first and second bipolar transistors forming an inverter output;
- first and second base current control units connected to bases of a respective one of said first and second bipolar transistors, said control units each being supplied by a control voltage source, and each being referenced to a different ground potential;
- a power supply unit including a transformer having a primary winding connectable to said conductors of said D.C. voltage supply, and first and second separate secondary windings, each second winding supplying, through respective rectifiers, a respective one of the control units with a substantially constant D.C. control voltage, said power supply unit further comprising a voltage regulator including a tertiary winding of said transformer, a device controlled by the tertiary winding and a switch in series with said primary winding, said switch being controlled by said device.
A control device comprising:
- a first and a second bipolar transistor connected in series, and connectable between first and second conductors of a D.C. voltage supply, a center point between said first and second bipolar transistors forming an inverter output;
- and
- first and second base current control units connected to bases of a respective one of said first and second bipolar transistors, said control units each being supplied by a control voltage source, and each being referenced to a different ground potential, each control unit including means for selectively connecting a base of the respective bipolar transistor to a positive D.C. control voltage supply through a resistor to turn the respective bipolar transistor on and for connecting said base of the respective bipolar transistor to a negative D.C. control voltage supply to turn the respective bipolar transistor off said means for selectively connecting including a current regulator for delivering a constant current, connected in series with an energy storage inductor, said current regulator comprising a sensor of the current flowing through the inductor, a regulating amplifier controlled by said sensor and a switch controlled by said amplifier to maintain a mean base current at a constant value;
- a power supply unit including a transformer with a primary winding connectable to said D.C. voltage supply and first and second separate secondary windings, each second winding supplying, through respective rectifiers, a respective one of the control units with a substantially constant D.C. control voltage.
1 more element
Dependencies are inferred from the claim text.