Patent EP0259889A2 successfully refreshed from Google Patents.
EP0259889A2
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EP
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Switching regulator type power supply circuit
Assignee: Sanyo Electric Co Ltd
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Filing: 1987-09-11
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Granted: —
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Expires: 2007-09-11
Abstract
Abstract A switching regulator type power supply circuit comprises a converter transformer (3), a blocking oscillation circuit comprising a transistor (TR4) having a collector connected to a rectifying output of an AC power supply through the input winding (N1) of the transformer (3) and an emitter and a base connected to a positive feedback winding (N3) of the transformer, and a switching control circuit (4, 5) connected between the base of the transistor (TR4) and a fluctuation detecting winding (N4) and the positive feedback winding (N3) of the converter transformer (3). Still another switching transistor (TR6) is connected between the base of the switching transistor (TR4) and the positive feedback winding (N3) and a proportional current supply circuit (L1, D12) comprising a coil (L1) and a Zener diode (D12) is connected to the emitter and the base, the base having a resistor (R21) for bias connected thereto. As a result, when a fluctuation of the input voltage applied to the input winding (N1) or a fluctuation of a load connected to the output winding (N2) occurs, a base current in accordance with the fluctuation of the collector current is supplied to transistor for blocking oscillation.
Inventors
- 👤 Shunji Asai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 16:24
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
268 words
A switching regulator type power supply circuit comprising: DC power supply means (1); converter transformer means (3) comprising input winding (N1), positive feedback winding (N3) and output winding (N2) electromagnetically coupled to said input winding and detecting winding (N4) electromagnetically coupled to said input winding (N1) and said output winding(N2); rectifying circuit means (6) coupled to said output winding (N2) for rectifying and smoothing the output voltage from said output winding (N2); blocking oscillation means (2) comprising first switching transistor means (TR4) having a common electrode, an output electrode and a control electrode and being coupled to said DC power supply means (1) in series through said input winding (N1) and connected to said positive feedback winding (N3) at the control electrode of said first switching transistor means (TR4) for performing a blocking oscillating operation; positive feedback current control means (8) coupled to the control electrode of said first switching transistor means (TR4) and said positive feedback winding (N3) and responsive to a voltage generated in said positive feedback winding (N3) for applying a positive feedback current increasing as a applying a positive feedback current increasing as a function of the lapse of time during the on period of said first switching transistor means (TR4) to the control electrode of said first switching transistor means (TR4); and switching control means (4, 5) coupled to said detecting winding (N4) and responsive to the fluctuation voltage responsive to a fluctuation of the output voltage of said output winding (N2) outputted from said detecting winding (N4) for controlling the duration of the on period of said first switching transistor means (TR4).
Claim 2
Dependent Claim
268 words
A switching regulator type power supply circuit comprising: DC power supply means (1); converter transformer means (3) comprising input winding (N1), positive feedback winding (N3) and output winding (N2) electromagnetically coupled to said input winding and detecting winding (N4) electromagnetically coupled to said input winding (N1) and said output winding(N2); rectifying circuit means (6) coupled to said output winding (N2) for rectifying and smoothing the output voltage from said output winding (N2); blocking oscillation means (2) comprising first switching transistor means (TR4) having a common electrode, an output electrode and a control electrode and being coupled to said DC power supply means (1) in series through said input winding (N1) and connected to said positive feedback winding (N3) at the control electrode of said first switching transistor means (TR4) for performing a blocking oscillating operation; positive feedback current control means (8) coupled to the control electrode of said first switching transistor means (TR4) and said positive feedback winding (N3) and responsive to a voltage generated in said positive feedback winding (N3) for applying a positive feedback current increasing as a applying a positive feedback current increasing as a function of the lapse of time during the on period of said first switching transistor means (TR4) to the control electrode of said first switching transistor means (TR4); and switching control means (4, 5) coupled to said detecting winding (N4) and responsive to the fluctuation voltage responsive to a fluctuation of the output voltage of said output winding (N2) outputted from said detecting winding (N4) for controlling the duration of the on period of said first switching transistor means (TR4).
Claim 3
Dependent Claim
135 words
A switching regulator type power supply circuit in accordance with claim 1, wherein said positive feedback current control means (8) comprises: bias means (R21) coupled to said positive feedback winding (N3) and responsive to a voltage generated in said positive feedback winding (N3) for providing a bias voltage; second switching transistor means (TR6) having a common electrode, an output electrode and a control electrode receiving a bias voltage and being turned on at the time when said first switching transistor means (TR4) is turned on in response to said bias voltage; and proportional current supply means (L1, D12) for applying a positive feedback current increasing approximately in proportion to the lapse of time to the control electrode of said first switching transistor means (TR4) during the on time of said first switching transistor means (TR4).
Claim 4
Dependent Claim
65 words
A switching regulator type power supply circuit in accordance with claim 2, wherein said positive feedback current control means (8) further comprises: trigger current supply means (R2, R20, C10, D11) for applying a necessary trigger current for said first switching transistor means (TR4) to be turned on to said first switching transistor means (TR4) immediately after said DC power supply means (1) is turned on.
Claim 5
Dependent Claim
102 words
A switching regulator type power supply circuit in accordance with claim 1, wherein the output electrode of said first switching transistor means (TR4) is connected to the other terminal of said input winding (N1) having one terminal connected to one terminal of said DC power supply means (1), and the common electrode of said first switching transistor means (TR4) is connected to one terminal of said positive feedback winding (N3) and the other terminal of said DC power supply means (1), said positive feedback winding (N3) having one terminal and the other terminal connected to said positive feedback current control means (8).
Claim 6
Dependent Claim
74 words
A switching regulator type power supply circuit in accordance with claim 2, wherein the common electrode of said second switching transistor means (TR6) is connected to said proportional current supply means (L1, D12), the control electrode of said second switching transistor means (TR6) is connected to said bias means (R21), and the output electrode of said second switching transistor means (TR6) is connected to the control electrode of said first switching transistor means (TR4).
Claim 7
Dependent Claim
169 words
A switching regulator type power supply circuit in accordance with claim 2, wherein said second switching transistor means (TR6) comprises a PNP type transistor, the output electrode of said second switching transistor means (TR6) being connected to the control electrode of said first switching transistor means (TR4); said proportional current supply means (L1, D12) comprises first inductor means (L1) connected to the common electrode of said second switching transistor means (TR6) and first Zener diode means (D12) connected between the control electrode of said second switching transistor means (TR6) and said first inductor means (L1) such that a breakdown current flows in the direction toward the control electrode of said second switching transistor means (TR6), said first inductor means (L1) being connected so as to receive a current from the other terminal of said positive feedback winding (N3); and said bias means (R21) comprises first resistor means (R21) connected between the control electrode of said second switching transistor means (TR6) and one terminal of said positive feedback winding (N3).
Claim 8
Dependent Claim
163 words
A switching regulator type power supply circuit in accordance with claim 2, wherein said second switching transistor means (TR6) comprises an NPN type transistor; said proportional current supply means (L1, R12) comprises second inductor means (L1) connected between the common electrode of said second switching transistor means (TR6) and the control electrode of said first switching transistor means (TR4) and second Zener diode means (D12) connected between the control electrode of said first switching transistor means (TR4) and the control electrode of said second switching transistor means (TR6) such that a breakdown current flows in the direction toward the control electrode of said first switching transistor means (TR4); said bias means (R21) comprises second resistor means (R21) connected between the control electrode and the output electrode of said second switching transistor means (TR6); and the output electrode of said second switching transistor means (TR6) is connected so as to receive a current from the other terminal of said positive feedback winding means (N3).
Claim 9
Dependent Claim
49 words
A switching regulator type power supply circuit in accordance with claim 3, wherein said trigger current supply means (R2, R20, C10, D11) comprises third resistor means (R2) connected between one terminal of said DC power supply means (1) and the control electrode of said first switching transistor means (TR4).
Claim 10
Dependent Claim
125 words
A switching regulator type power supply circuit in accordance with claim 3, wherein said trigger current supply means (R2, R20, C10, D11) comprises a series connection of fourth resistor means (R20) and a parallel connection of capacitance means (C10) and diode means (D11), connected between the control electrode of said first switching transistor means (TR4) and the other terminal of said positive feedback winding (N3) so as to allow a current to flow from the other terminal of said positive feedback winding (N3) to the control electrode of said first switching transistor means (TR4), the diode means (D11) being connected in such direction that a current is applied from said positive feedback winding (N3) to the control electrode of said first switching transistor means (TR4).
Claim 11
Dependent Claim
127 words
A switching regulator type power supply circuit in accordance with claim 1, wherein said switching control means (4, 5) comprises: integrating circuit means (IC) coupled to said positive feedback winding (N3) for integrating a voltage generated in said positive feedback winding (N3) for outputting integrated voltage; fluctuation voltage output circuit means (4) coupled to said detecting winding (N4) for converting a voltage generated in said detecting winding (N4) to a fluctuation voltage of an appropriate DC voltage value; and third switching transistor means (TR2) coupled to said integrating circuit means (IC) and said fluctuation voltage output circuit means (4) and responsive to a sum voltage of the integrated voltage and the DC fluctuation voltage for being turned on for turning said first switching transistor means (TR4) off.
References Cited (Backward Citations)
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