JPS57185523A - Switching power supply provided with dummy resistor - Google Patents

Switching power supply provided with dummy resistor

Info

Publication number
JPS57185523A
JPS57185523A JP56070327A JP7032781A JPS57185523A JP S57185523 A JPS57185523 A JP S57185523A JP 56070327 A JP56070327 A JP 56070327A JP 7032781 A JP7032781 A JP 7032781A JP S57185523 A JPS57185523 A JP S57185523A
Authority
JP
Japan
Prior art keywords
dummy resistor
voltage
conduction width
power supply
trtd
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56070327A
Other languages
Japanese (ja)
Inventor
Hideo Yokoyama
Fumiaki Ihara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Telecom Networks Ltd
Original Assignee
Fujitsu Telecom Networks Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Telecom Networks Ltd filed Critical Fujitsu Telecom Networks Ltd
Priority to JP56070327A priority Critical patent/JPS57185523A/en
Publication of JPS57185523A publication Critical patent/JPS57185523A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33538—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type

Abstract

PURPOSE:To eliminate unnecessary power consumption and to increase the efficiency, by increasing a current flowing to a dummy resistor only when the conduction width at switching is decreased. CONSTITUTION:The conduction width of a primary pulse is detected with the 2nd secondary winding W at the secondary side of a transformer T, a rectified voltage is introducted to a rectifying circuit RECIII and a comparison voltage with the voltage division of the output voltage is used for a bias voltage of a transistor (TR)TD connected in series with a dummy resistor DR. When a load current is small, i.e., the conduction width is small, the TRTD is forward- biased and conductive, and a current flowing to the dummy resistor DR is larger, a load current is increased. As the conduction width is increased, the forward bias voltage is smaller, and the TRTD is nonconductive, causing the same state that the dummy resistor DR is eliminated. That is, detects of useless power consumption during the normal operation of the power supply can be avoided.
JP56070327A 1981-05-11 1981-05-11 Switching power supply provided with dummy resistor Pending JPS57185523A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56070327A JPS57185523A (en) 1981-05-11 1981-05-11 Switching power supply provided with dummy resistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56070327A JPS57185523A (en) 1981-05-11 1981-05-11 Switching power supply provided with dummy resistor

Publications (1)

Publication Number Publication Date
JPS57185523A true JPS57185523A (en) 1982-11-15

Family

ID=13428228

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56070327A Pending JPS57185523A (en) 1981-05-11 1981-05-11 Switching power supply provided with dummy resistor

Country Status (1)

Country Link
JP (1) JPS57185523A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6241383U (en) * 1985-08-30 1987-03-12
JPS6359766A (en) * 1986-08-27 1988-03-15 Nippon Chemicon Corp Switching regulator
JPS6447271A (en) * 1987-08-13 1989-02-21 Fujitsu Denso Overcurrent protective circuit
JPH0731141A (en) * 1993-02-17 1995-01-31 Stanley Electric Co Ltd Constant voltage circuit
KR100636241B1 (en) 2005-06-16 2006-10-19 삼성전자주식회사 Switching mode power supply with active load detection and switching method thereof
EP2603962A2 (en) * 2010-09-23 2013-06-19 Siemens Aktiengesellschaft Dc charging station for a battery of an electric vehicle
WO2020021279A1 (en) * 2018-07-27 2020-01-30 Murata Manufacturing Co., Ltd. Variable dc-dc converter and no-load clamp

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417947A (en) * 1977-07-11 1979-02-09 Toyota Motor Corp Spray coating of aqueous coating compound

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417947A (en) * 1977-07-11 1979-02-09 Toyota Motor Corp Spray coating of aqueous coating compound

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6241383U (en) * 1985-08-30 1987-03-12
JPS6359766A (en) * 1986-08-27 1988-03-15 Nippon Chemicon Corp Switching regulator
JPS6447271A (en) * 1987-08-13 1989-02-21 Fujitsu Denso Overcurrent protective circuit
JPH0524748B2 (en) * 1987-08-13 1993-04-08 Fujitsu Denso
JPH0731141A (en) * 1993-02-17 1995-01-31 Stanley Electric Co Ltd Constant voltage circuit
KR100636241B1 (en) 2005-06-16 2006-10-19 삼성전자주식회사 Switching mode power supply with active load detection and switching method thereof
EP2603962A2 (en) * 2010-09-23 2013-06-19 Siemens Aktiengesellschaft Dc charging station for a battery of an electric vehicle
EP2603962B1 (en) * 2010-09-23 2024-02-14 Siemens Aktiengesellschaft Dc charging station for a battery of an electric vehicle and a charging method
WO2020021279A1 (en) * 2018-07-27 2020-01-30 Murata Manufacturing Co., Ltd. Variable dc-dc converter and no-load clamp
US11901824B2 (en) 2018-07-27 2024-02-13 Murata Manufacturing Co., Ltd. Variable DC-DC converter and no-load clamp

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