JPS56123781A - Electric power control device - Google Patents

Electric power control device

Info

Publication number
JPS56123781A
JPS56123781A JP2696680A JP2696680A JPS56123781A JP S56123781 A JPS56123781 A JP S56123781A JP 2696680 A JP2696680 A JP 2696680A JP 2696680 A JP2696680 A JP 2696680A JP S56123781 A JPS56123781 A JP S56123781A
Authority
JP
Japan
Prior art keywords
normal voltage
circuit
output
transistor
valve
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
JP2696680A
Other languages
Japanese (ja)
Inventor
Keizo Yoshida
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2696680A priority Critical patent/JPS56123781A/en
Publication of JPS56123781A publication Critical patent/JPS56123781A/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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To prevent damages to a transistor because of an overcurrent, by preventing an on/off control signal after detection by a detection circuit from being applied to a transistor base. CONSTITUTION:When a voltage of a resistor 17 is lower than the normal voltage a comparator 18 outputs a logic 1, and when higher it outputs a logic 0. And because the comparator 18 possesses a latching function, a state in which the output is 0 is retained after an output is changed 1-0. When an input current valve to a switch circuit 11 surpasses a corresponding valve of the normal voltage, an output from a pulse width modulation circuit 15 is prevented from being input to a base driving circuit 16 because of a gate circuit 19. Therefore all transistors 11-1-11-4 fall into a state of noncontinuity. Consequently by setting the normal voltage of a normal voltage generator 20 at a lower value than that corresponding to the maximum valve of the permissible current of the transistors 11-1-11-4, a flow of overcurrent to each transistor can preliminerily prevented.
JP2696680A 1980-03-04 1980-03-04 Electric power control device Pending JPS56123781A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2696680A JPS56123781A (en) 1980-03-04 1980-03-04 Electric power control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2696680A JPS56123781A (en) 1980-03-04 1980-03-04 Electric power control device

Publications (1)

Publication Number Publication Date
JPS56123781A true JPS56123781A (en) 1981-09-29

Family

ID=12207890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2696680A Pending JPS56123781A (en) 1980-03-04 1980-03-04 Electric power control device

Country Status (1)

Country Link
JP (1) JPS56123781A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59106881A (en) * 1982-12-10 1984-06-20 Mitsubishi Electric Corp Protecting system for inverter of air conditioner
JPS59123469A (en) * 1982-12-28 1984-07-17 Fuji Electric Co Ltd Faulty arm detection circuit in inverter
JPS59123470A (en) * 1982-12-28 1984-07-17 Fuji Electric Co Ltd Arm shortcircuit detecting circuit for inverter
JPS59213280A (en) * 1983-05-17 1984-12-03 Sanyo Electric Co Ltd Protecting device of inverter circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59106881A (en) * 1982-12-10 1984-06-20 Mitsubishi Electric Corp Protecting system for inverter of air conditioner
JPS59123469A (en) * 1982-12-28 1984-07-17 Fuji Electric Co Ltd Faulty arm detection circuit in inverter
JPS59123470A (en) * 1982-12-28 1984-07-17 Fuji Electric Co Ltd Arm shortcircuit detecting circuit for inverter
JPS59213280A (en) * 1983-05-17 1984-12-03 Sanyo Electric Co Ltd Protecting device of inverter circuit

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