Single regulation power supply with load compensation of an auxiliary voltage output

• US 4,660,136 A
• Filed: 01/21/1986
• Issued: 04/21/1987
• Est. Priority Date: 01/24/1985
• Status: Expired due to Fees

• Current Assignee: Honeywell Information Systems, Inc. (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Montorefano, Gianpaolo
• Primary Examiner(s): Salce, Patrick R.
• Assistant Examiner(s): VOELTZ, EMANUEL T
• Application Number:
  US06/820,768
• Time in Patent Office: 455 Days
• Field of Search: 363/15, 363/17, 363/18, 363/20-26, 363/41, 363/50, 363/55, 363/56, 363/58, 363/67, 363/74, 363/79, 363/86, 363/89, 363/95, 363/100, 363/131-134, 363/97, 323/265-267
• US Class Current: 363/26
• CPC Class Codes: H02M 1/009 having two or more independently controlled outputs for DC-DC converter with intermediate AC H02M3/33561
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control

Abstract

A single regulation power supply providing load compensation of an auxiliary voltage output, wherein power is transferred from the primary winding of a transformer to a first and a second secondary windings each coupled to a rectifying and filter network respectively providing a main and an auxiliary voltage output, wherein a control loop senses the algebraic sum of the main output voltage and the voltage drop developed in a resistor by current drawn by a load on the auxiliary voltage output and controls current pulses applied to the primary winding so as to keep constant such sum, thereby rendering the auxiliary voltage insensitive to load changes at the auxiliary output, to any desired extent determined by the value of such resistor, with the trade off of a limited degradation in the control of the main voltage output.

Claims

1. A single regulation power supply providing load compensation of an auxiliary voltage output, wherein, power is transferred from a primary winding of a transformer to first and second secondary windings, the secondary windings being respectively connected to a first and a second rectifying and filter network respectively providing a first and a second DC voltage source, comprising:

a resistor connected to one terminal of each of said sources to connect said sources in series;

a main load connected across said first source;

an auxiliary load connected between the terminals of each source opposite the terminal of said source connected to said resistor; and

a control loop for sensing a voltage and responsive thereto to control current pulses supplied to said primary winding to maintain the voltage sensed thereby at a preestablished level, said control loop being connected across said resistor and said first source to sense the algebraic sum of the voltage of said source and the voltage drop across said resistor.

2. A single regulation power supply providing load compensation of an auxiliary voltage output, wherein, power is transferred from a primary winding of a transformer to first and second secondary windings, the secondary windings being respectively connected to a first and a second rectifying and filter network respectively providing at a first and a second output terminal a first and a second DC voltage, a control loop sensing said first DC voltage and controlling current pulses supplied to said primary winding so as to keep said first DC voltage a pre-established level, characterized in that said power supply comprises a resistor, through which flows the current drawn from said second output terminal and wherein said control loop senses the algebraic sum of said first DC voltage and the voltage drop across said resistor, wherein said resistor has a value R not greater than (N₂ /N₃)R₃ -R₂ where N₂ /N₃ is the turns ratio of said first and second secondary windings and R₂ and R₃ are the respective equivalent resistances of said first and second secondary windings and associated filter networks.