Chopping control system for a converter in a DC electrical power supply
First Claim
1. A chopping control system for a converter in a DC electrical power supply comprising a chopping transformer having a primary and a secondary winding, a chopping transistor, means for connecting the collector of said chopping transistor via the primary winding of said chopping transformer to a first terminal of a source of DC voltage to be chopped and the emitter of said chopping transistor to a second terminal of the source of DC voltage to be chopped, means for connecting the secondary winding of said transformer to a rectifying circuit, a control transistor for controlling firing of the chopping transistor, said control transistor having its emitter connected to a fixed reference potential and its collector connected to a DC supply source, a source of clock pulses, means operatively connecting the base of the control transistor for receiving said clock pulses to control chopping, a pulse transformer having a primary and a secondary winding, means for connecting the primary winding of said pulse transformer between the collector of the control transistor and the DC supply source, means for connecting the secondary winding of said pulse transformer at one of its ends and at a point intermediate its ends to the base of the chopping transistor and at its other end to the emitter of the chopping transistor so as to provide two isolated base circuits for said chopping transistor.
0 Assignments
0 Petitions
Accused Products
Abstract
A system for controlling chopping for a converter in a DC electrical power supply.
A transistor is arranged for chopping the DC input voltage which is connected to a chopping transformer. A control transistor controls the chopping transistor by means of pulses which it receives from a clock, via a pulse transformer.
-
Citations
10 Claims
-
1. A chopping control system for a converter in a DC electrical power supply comprising a chopping transformer having a primary and a secondary winding, a chopping transistor, means for connecting the collector of said chopping transistor via the primary winding of said chopping transformer to a first terminal of a source of DC voltage to be chopped and the emitter of said chopping transistor to a second terminal of the source of DC voltage to be chopped, means for connecting the secondary winding of said transformer to a rectifying circuit, a control transistor for controlling firing of the chopping transistor, said control transistor having its emitter connected to a fixed reference potential and its collector connected to a DC supply source, a source of clock pulses, means operatively connecting the base of the control transistor for receiving said clock pulses to control chopping, a pulse transformer having a primary and a secondary winding, means for connecting the primary winding of said pulse transformer between the collector of the control transistor and the DC supply source, means for connecting the secondary winding of said pulse transformer at one of its ends and at a point intermediate its ends to the base of the chopping transistor and at its other end to the emitter of the chopping transistor so as to provide two isolated base circuits for said chopping transistor.
- 2. A chopping control system for a converter in a DC electrical power supply comprising a chopping transformer having a primary and a secondary winding, a chopping transistor, means for connecting the collector of said chopping transistor via the primary winding of said chopping transformer to a first terminal of a source of DC voltage to be chopped and the emitter of said chopping transistor to a second terminal of the source of DC voltage to be chopped, means for connecting the secondary winding of said transformer to a rectifying circuit, a control transistor for controlling firing of the chopping transistor, said control transistor having its emitter connected to a fixed reference potential and its collector connected to a DC supply source, a source of clock pulses, means operatively connecting the base of the control transistor for receiving said clock pulses to control chopping, a pulse transformer having a primary and a secondary winding, means for connecting the primary winding of said pulse transformer between the collector of the control transistor and the DC supply source, means for connecting the secondary winding of said pulse transformer at one of its ends and at a point intermediate its ends to the base of the chopping transistor and at its other end to the emitter of the chopping transistors, said means including a first rectifier connected between said one end and the base of the chopping transistor and disposed to conduct in the direction in which the base current flows and a second rectifier connected between said intermediate point and the base of the chopping transistor, said second rectifier being disposed to conduct in a direction opposite from that in which the base current flows in the chopping transistor.
Specification