JPS566508A - Ground-fault detecting circuit for btl amplifier - Google Patents

Ground-fault detecting circuit for btl amplifier

Info

Publication number
JPS566508A
JPS566508A JP8139079A JP8139079A JPS566508A JP S566508 A JPS566508 A JP S566508A JP 8139079 A JP8139079 A JP 8139079A JP 8139079 A JP8139079 A JP 8139079A JP S566508 A JPS566508 A JP S566508A
Authority
JP
Japan
Prior art keywords
ground
fault
voltage
current
supply lines
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
JP8139079A
Other languages
Japanese (ja)
Inventor
Kunio Seki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8139079A priority Critical patent/JPS566508A/en
Publication of JPS566508A publication Critical patent/JPS566508A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3081—Duplicated single-ended push-pull arrangements, i.e. bridge circuits

Abstract

PURPOSE:To detect the ground-fault from the current difference between the voltage and earth supply lines for the BTL (Bridged Transformer Less) amplifier, by utilizing the fact that the voltage and earth supply lines have an equal current level as long as no ground-fault occurs. CONSTITUTION:The differential amplifying circuit forms buffer amplifier 2 which produces the signals with the phase same as or opposite to input signal VIN. The in-phase signal is supplied to the 1st amplifying output circuit 3, and the opposite- phase signal is supplied to the 2nd amplifying output circuit 4 each. Then these outputs VOUT1 and VOUT2 of the opposite phases to each other drive load RL. For detection of the ground-fault, resistances R1 and R2 are inserted in series to the power supply lines of power voltage VCC and earth potential OV each. Thus the supply current is inverted into the voltage signal. And the difference if occurring to the current is detected to cut off the output transistors of output circuits 3 and 4. In such way, the protection is secured to the ground-fault.
JP8139079A 1979-06-29 1979-06-29 Ground-fault detecting circuit for btl amplifier Pending JPS566508A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8139079A JPS566508A (en) 1979-06-29 1979-06-29 Ground-fault detecting circuit for btl amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8139079A JPS566508A (en) 1979-06-29 1979-06-29 Ground-fault detecting circuit for btl amplifier

Publications (1)

Publication Number Publication Date
JPS566508A true JPS566508A (en) 1981-01-23

Family

ID=13744967

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8139079A Pending JPS566508A (en) 1979-06-29 1979-06-29 Ground-fault detecting circuit for btl amplifier

Country Status (1)

Country Link
JP (1) JPS566508A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5175489A (en) * 1989-10-02 1992-12-29 Kabushiki Kaisha Toshiba Current-detecting circuit
EP2157437A1 (en) 2008-08-19 2010-02-24 SMA Solar Technology AG Method for measuring a current, particularly through an earthing device
US8717047B2 (en) 2008-08-19 2014-05-06 Sma Solar Technology Ag Method for measuring a current, in particular by means of a grounding apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4911262A (en) * 1972-05-29 1974-01-31
JPS5081047A (en) * 1973-11-15 1975-07-01
JPS5480052A (en) * 1977-12-08 1979-06-26 Hitachi Ltd Protecting device for amplifier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4911262A (en) * 1972-05-29 1974-01-31
JPS5081047A (en) * 1973-11-15 1975-07-01
JPS5480052A (en) * 1977-12-08 1979-06-26 Hitachi Ltd Protecting device for amplifier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5175489A (en) * 1989-10-02 1992-12-29 Kabushiki Kaisha Toshiba Current-detecting circuit
WO1993017492A1 (en) * 1989-10-02 1993-09-02 Yasuo Mizuide Current detecting circuit
EP2157437A1 (en) 2008-08-19 2010-02-24 SMA Solar Technology AG Method for measuring a current, particularly through an earthing device
US8169226B2 (en) 2008-08-19 2012-05-01 Sma Solar Technology Ag Method for measuring a current, in particular by means of a grounding apparatus
US8717047B2 (en) 2008-08-19 2014-05-06 Sma Solar Technology Ag Method for measuring a current, in particular by means of a grounding apparatus

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