JPS566508A - Ground-fault detecting circuit for btl amplifier - Google Patents
Ground-fault detecting circuit for btl amplifierInfo
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
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.
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)
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)
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 |
-
1979
- 1979-06-29 JP JP8139079A patent/JPS566508A/en active Pending
Patent Citations (3)
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)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS55105436A (en) | Sense circuit | |
JPS54117655A (en) | Voltage comparator | |
KR910016139A (en) | Active filter | |
GB2309564A (en) | Bitline level insensitive sense amplifier | |
KR840003160A (en) | Differential amplifier | |
JPS566508A (en) | Ground-fault detecting circuit for btl amplifier | |
JPS5547459A (en) | Dc motor driving reverse and missing phase detector circuit | |
KR890003113A (en) | BTL power amplifier circuit | |
US4446442A (en) | Amplifier circuit | |
KR910010831A (en) | Circuitry for detecting output distortion of the last stage of an audio device | |
US2941154A (en) | Parallel transistor amplifiers | |
KR940013204A (en) | Current source circuit and emitter coupled logic circuit | |
KR880014734A (en) | amplifier | |
KR910003918A (en) | Amplifier | |
JPS5634213A (en) | Signal muting circuit in bridge amplifier | |
JPS5531302A (en) | Btl-system amplifier device | |
US3546485A (en) | Bidirectional analog gate | |
JPS5678205A (en) | Earth detecting circuit for btl amplifier | |
KR840008728A (en) | Emitter Follower SEPP Circuit | |
JPS57123709A (en) | Btl amplifier | |
JPH0271631A (en) | Noise volume detection circuit | |
JPS57164605A (en) | Amplifier | |
JPS5611353A (en) | Eddy current check unit | |
JPS55154470A (en) | Level detecting system | |
SU1107272A1 (en) | Transducer of overload of power amplifier |