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US5936852A Expired / Lapsed US ⏱️ 0.0 years remaining

Switched mode power supply with both main output voltage and auxiliary output voltage feedback

Assignee: Siemens AG
•
Filing: 1999-01-14
•
Granted: 1999-08-10
•
Expires: 2019-01-14
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Abstract

Abstract Switched mode mains power supply unit having a transformer (Tr), which comprises a primary winding (L P ) and at least one secondary winding (L S ) as well as an auxiliary winding (L H ), having a switch (S) controlled by a control circuit (A), by means of which switch the primary winding is connected to an input direct voltage (U E ), having, connected downstream of the secondary winding, a rectifier (D1) together with a filtering means (C1) for producing an output direct voltage (U A ) and having a regulator means (K1) for producing a first control variable (St1) for the control circuit (A) in dependence upon the deviation of the output voltage from a first set value (U Ref1 ), wherein the pulse duty ratio and/or the frequency of the control signal of the controlled switch depends upon the control variable, and also having an auxiliary rectifier (D2; Glr) connected downstream of the auxiliary winding (L H ) in order to produce an auxiliary direct voltage (U H ) for the control circuit and/or other consumers, having an auxiliary regulator (K2) to produce a second control variable (St2) for the control circuit (A) in dependence upon the deviation of the auxiliary direct voltage (U H ) from a second set value (U Ref2 ), and having a selector circuit (AS) for priority supply of the control variable of that regulator to the control circuit (A), the actual value of which lies below the associated set value.

Inventors

  • 👤 Harald Weinmeier
  • 👤 Volker Potzelberger

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 14:39
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33561; H02M1/00; H02M1/0003; H02M1/0006

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 203 words
Switched mode power supply having a transformer, which comprises a primary winding and at least one secondary winding as well as an auxiliary winding, having a switch controlled by a control circuit, by means of which switch the primary winding is connected to an input direct voltage, having, connected downstream of the secondary winding, a rectifier together with a filtering means for producing an output direct voltage and having a regulator means for producing a first control variable for the control circuit in dependence upon the deviation of the output voltage from a first set value, wherein the pulse duty ratio and/or the frequency of the control signal of the controlled switch depends upon the control variable, and also having an auxiliary rectifier connected downstream of the auxiliary winding in order to produce an auxiliary direct voltage for the control circuit and/or other consumers, characterised by an auxiliary regulator to produce a second control variable for the control circuit in dependence upon the deviation of the auxiliary direct voltage from a second set value and a selector circuit for priority supply of the control variable of that regulator to the control circuit, the actual value of which lies below the associated set value.
Claim 2
Dependent Claim 203 words
Switched mode power supply having a transformer, which comprises a primary winding and at least one secondary winding as well as an auxiliary winding, having a switch controlled by a control circuit, by means of which switch the primary winding is connected to an input direct voltage, having, connected downstream of the secondary winding, a rectifier together with a filtering means for producing an output direct voltage and having a regulator means for producing a first control variable for the control circuit in dependence upon the deviation of the output voltage from a first set value, wherein the pulse duty ratio and/or the frequency of the control signal of the controlled switch depends upon the control variable, and also having an auxiliary rectifier connected downstream of the auxiliary winding in order to produce an auxiliary direct voltage for the control circuit and/or other consumers, characterised by an auxiliary regulator to produce a second control variable for the control circuit in dependence upon the deviation of the auxiliary direct voltage from a second set value and a selector circuit for priority supply of the control variable of that regulator to the control circuit, the actual value of which lies below the associated set value.
Claim 3
Dependent Claim 26 words
Switched mode power supply according to claim 1, characterised in that the first control variable of the selector circuit is supplied via an optical coupling device.
Claim 4
Dependent Claim 33 words
Switched mode power supply according to claim 1, characterised in that a capacitor connected downstream of the auxiliary rectifier can be charged by means of a resistor connected to the input direct voltage.
Claim 5
Dependent Claim 54 words
Switched mode power supply according to claim 2, characterised in that the selector circuit comprises two transistors connected in series, wherein the two control variables are supplied to the respective transistor inputs, and the output signal arising at a resistor, common to both transistors is supplied to the selector circuit of the control circuit.
Claim 6
Dependent Claim 26 words
Switched mode power supply according to claim 4, characterised in that one of the transistors connected in series is the transistor of the optical coupling device.
Claim 7
Dependent Claim 32 words
Switched mode power supply according to claim 1, characterised in that a resistor to produce a low base charge is connected in parallel with the output of the mains power supply unit.

References Cited (Backward Citations)

US4387418A Cited
DE3508895A1 Cited
US5043598A Cited
DE4204912A1 Cited
EP0622890A2 Cited
US5481450A Cited
US5877946A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2002-08-09 2003-02-08 2003-08-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2006-08-09 2007-02-08 2007-08-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2010-08-09 2011-02-08 2011-08-10 $7700.00 Window Closed / Lapsed

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