Multi-outputting power supply circuit without dummy load resistor
First Claim
Patent Images
1. A multi-outputting switching power supply circuit comprising:
- a main-output circuit section; and
at least one sub-output circuit section, wherein said at least one sub-output circuit section is controlled by a magnetic amplifier for amplifying electric power magnetically and said main-output circuit section includes a synchronous rectifying circuit comprising a MOS transistor controlled by a voltage drop across a substantially non-resistive element in said rectifying circuit, thereby allowing a dummy load to be omitted from said rectifying circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A main-output circuit section includes a synchronous rectifying circuit composed of a NMOS, therefore, even if a load RL1 become light, a rise of direct current output voltage is prevented without a dummy resistor and electric dummy circuit, accordingly, when a NMOS is in an ON state, an abrupt narrowing of a time width does not occur. Therefore the product of voltage and time is ensured, direct current output voltage is easily produced stably.
22 Citations
28 Claims
-
1. A multi-outputting switching power supply circuit comprising:
-
a main-output circuit section; and
at least one sub-output circuit section, wherein said at least one sub-output circuit section is controlled by a magnetic amplifier for amplifying electric power magnetically and said main-output circuit section includes a synchronous rectifying circuit comprising a MOS transistor controlled by a voltage drop across a substantially non-resistive element in said rectifying circuit, thereby allowing a dummy load to be omitted from said rectifying circuit.
-
-
2. A multi-outputting switching power supply circuit comprising:
-
a main-output circuit section having a smoothing choke to store energy during a first period of time; and
at least one sub-output circuit section controlled by a magnetic amplifier for amplifying electric power magnetically, wherein said main-output circuit section includes a synchronous rectifying circuit comprising a MOS transistor switched on by a voltage within said rectifying circuit during a second period of time to allow a portion of said stored energy to discharge, thereby allowing a dummy load to be omitted from said rectifying circuit.
-
-
3. A multi-outputting switching power supply circuit comprising:
-
a direct current power supply section for producing a direct current input voltage;
a switching circuit for producing, by controlling said direct current input voltage for an ON or an OFF state based on an input control signal, a first alternating current voltage having a fixed frequency controlled based on said control signal and a pulse width corresponding to said control signal;
a transformer for producing, by transforming said first alternating current voltage, a second alternating current voltage with a fixed voltage value and at least one third alternative current voltage;
a first rectifying circuit for producing, by rectifying said second alternating current voltage, a first pulsating voltage;
a first smoothing circuit for producing, by smoothing said first pulsating voltage, a first direct output voltage so as to supply said first direct current voltage to a load;
a voltage change detecting circuit for producing, by detecting a change of said first direct current output voltage, a detective signal;
a controlling circuit for producing said control signal to control a pulse width of said first alternating current voltage for negative feed-back according to a level of said detective signal;
at least one magnetic amplifier for producing a fourth alternating current voltage for producing, by controlling said third alternating current voltage for an ON or and OFF state based on said reset electric current, a fourth alternating current voltage with a pulse width corresponding to a reset electric current;
at least one second rectifying circuit for producing, by rectifying said fourth alternating current voltage, a second pulsating voltage;
at least one second smoothing circuit for producing, by smoothing said pulsating voltage, a second direct current output voltage so as to supply said second direct current output voltage to a load; and
at least one voltage controlling circuit for producing, by detecting a change of said second direct current output voltage, said reset electric current to control said fourth alternating current voltage for negative feed-back, wherein said first rectifying circuit includes a switching circuit for producing said first pulsating voltage by controlling said second alternating current voltage for an ON or an OFF state, synchronizing with a timing of switching in said switching circuit. - View Dependent Claims (4, 5, 6, 7, 8, 27)
-
-
9. A multi-outputting switching power supply circuit comprising:
-
a direct current power supply section for producing a direct current input voltage;
a switching circuit for producing, by controlling said direct current input voltage for an ON or OFF state based on said input control signal, a first alternating current voltage having a fixed frequency controlled by a control signal and a pulse width corresponding to said control signal;
a transformer for producing, by transforming said first alternating voltage, a second alternating current voltage with a fixed voltage value and at least one third alternating current voltage;
a first rectifying circuit for producing, by rectifying said second alternating current voltage, a first pulsating voltage;
a first smoothing circuit for producing, by smoothing said first pulsating voltage, a first direct current output voltage so as to supply said first direct current output voltage to a load;
a voltage change detecting circuit for producing, by detecting a change of said first direct current output voltage, a detecting signal;
a controlling circuit for producing said control signal to control a pulse width of said first alternating current voltage for negative feed-back based on a level of said detective signal;
at least one magnetic amplifier for producing, by controlling said third alternating current voltage for an ON or an OFF state based on said reset electric current, a fourth alternating current voltage with a pulse width corresponding to a reset electric current;
at least one rectifying circuit for producing, by rectifying said fourth alternating current, a second pulsating voltage;
at least one smoothing circuit for producing, by smoothing said second pulsating voltage, a second direct current output voltage so as to supply said second direct current voltage to a load; and
at least one voltage controlling circuit for producing, by detecting a change of said second direct current output voltage, said reset electric current to control said fourth alternating current voltage for negative feed-back, wherein said first rectifying circuit is provided with a first switching circuit for producing, by controlling said second alternating current voltage for an ON or an OFF state, synchronizing with a timing of switching in said switching circuit, said first pulsating voltage, wherein said first smoothing circuit is provided with a smoothing capacitor for producing, by smoothing said first pulsating voltage, said first direct current output voltage, so as to supply said first direct current output voltage, so as to supply said first direct current output voltage to a load, a choke coil for storing an electromagnetic energy caused by said pulsating voltage, a second switching circuit supplying said electromagnetic energy stored in said choke coil to said smoothing capacitor by becoming in an ON state when said first switching circuit is in and OFF state. - View Dependent Claims (10, 11, 12, 13, 14, 28)
-
-
15. A multi-outputting switching power supply circuit comprising:
-
a direct current power supply section for producing a direct current input voltage;
a switching circuit for producing, by controlling said direct current input voltage for an ON or OFF state based on said input control signal, a first alternating current voltage having a fixed frequency controlled by a control signal and a pulse width corresponding to said control signal;
a transformer for producing, by transforming said first alternating current voltage, a second alternating current voltage with a fixed voltage value and at least one third alternating current voltage;
an active clamp circuit for resetting a core of said transformer by flowing an excitation current through a primary winding of said transformer while said switching circuit is in said OFF state;
a first rectifying circuit for producing a first pulsating voltage by rectifying said second alternating current voltage;
a first smoothing circuit for producing, by smoothing said first pulsating voltage, a first direct current output voltage so as to supply said first direct current output voltage to a load;
a voltage change detecting circuit for producing, by detecting a change of said first direct current output voltage, a detective signal;
a controlling circuit for producing said control signal to control a pulse width of said first alternating current voltage for negative feed-back based on a level of said detective signal;
at least one magnetic amplifier for producing, by controlling said third alternating electric current for an ON or an OFF state based on said reset electric current, a fourth alternating current voltage with a pulse width corresponding to a reset electric current;
at least one second rectifying circuit for producing, by rectifying said fourth alternating current voltage, a second pulsating voltage;
at least one smoothing circuit for producing, by smoothing said second pulsating voltage, a second pulsating voltage so as to supply said second direct current output voltage to a load; and
at least one voltage controlling circuit for producing, by detecting a change of said second direct current output voltage, said reset electric current to control said fourth alternating current voltage for negative feed-back, wherein said first rectifying circuit is provided with a first switching circuit for producing, by controlling said second alternating current voltage for an ON or an OFF state, synchronizing with a timing of switching in said switching circuit, said first pulsating voltage and wherein said first smoothing circuit is provided with a smoothing capacitor for producing, by smoothing said first pulsating voltage, said first direct current output voltage, so as to supply said first direct current output voltage to a load, a choke coil for storing an electromagnetic energy caused by said first pulsating voltage and a second switching circuit supplying said electromagnetic energy stored in said choke coil to said smoothing capacitor by becoming in an ON state when said first switching circuit is in an OFF state. - View Dependent Claims (16, 17, 18, 19, 20)
-
-
21. A multi-outputting switching power supply circuit comprising:
-
a direct current power supply section for producing a direct current input voltage;
a switching circuit for producing, by controlling said direct current input voltage for an ON or OFF state based on said input control signal, two or more first alternating current voltages having a fixed frequency controlled by a control signal and a pulse width corresponding to said control signal;
a plurality of transformers for producing, by transforming said first alternating current voltage, a second alternating current voltage with a fixed voltage value and at least one third alternating current voltage;
a first rectifying circuit for producing, by rectifying said second alternating current voltage, a first pulsating voltage;
a first smoothing circuit for producing, by smoothing said first pulsating voltage, a first direct current output, so as to supply said first direct current output voltage to a load;
a voltage change detecting circuit for producing, by detecting a change of said first direct current output voltage, a detective signal;
a controlling circuit for producing said control signal to control a pulse width of said first alternating current voltage for negative feed-back based on a level of said detective signal;
at least one magnetic amplifier for producing a fourth alternating current voltage with a pulse width corresponding to a reset electric current by controlling said third alternating current voltage for an ON or an OFF state based on said reset electric current;
at least one second rectifying circuit for producing, by rectifying said fourth alternating current voltage, a second pulsating voltage;
at least one smoothing circuit for producing, by rectifying said second pulsating voltage, a second direct current output voltage so as to supply said second direct current output voltage to a load; and
at least one voltage controlling circuit for producing, by detecting a change of said second direct current output voltage, said reset electric current to control said second alternating current voltage for negative feed-back, wherein said first rectifying circuit includes a switching circuit for producing said first pulsating voltage by controlling said second alternating current voltage for an ON or an OFF state, synchronizing with a timing of switching in said switching circuit. - View Dependent Claims (22, 23, 24, 25, 26)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeNEC Corporation
-
Original AssigneeNEC Corporation
-
InventorsWatanabe, Kiyohiko
-
Primary Examiner(s)BERHANE, ADOLF D
-
Application NumberUS09/859,590Publication NumberTime in Patent Office487 DaysField of Search323/267, 323/266, 363/21.04, 363/21.06, 307/11, 307/38US Class Current323/267CPC Class CodesH02M 3/33561 having more than one ouput ...
