Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1999-04-06
2000-04-11
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363132, H02M 75387
Patent
active
060494751
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is related to a power switching element and also to a power converting apparatus including a control IC for controlling this power switching element.
TECHNICAL BACKGROUND
FIG. 24 represents a connection between a power switching element for constructing a conventional power converting apparatus, and a control IC for driving/controlling this power switching element. In this drawing, reference numerals 1 to 4 show DC power supplies, reference numeral 5 indicates a resistor, reference numeral 6 represents a reactor, reference numerals 7 and 8 show switches, reference numerals 9 and 10 denote diodes, reference numeral 11 and 12 show resistors, and reference numeral 13 denotes an IC for driving the above-described switches 7 and 8.
The above-explained power supplies 1 and 2 are such power supplies for supplying energy to a load constituted by the above-described resistor 5 and the above-explained reactor 6. The power supply 3 is such a power supply for supplying electric power between a VB-terminal and a VS-terminal, corresponding to power supply terminals of the IC 13 for driving the switch 7. The DC power supply 4 is such a power supply for supplying electric power between a VCC-terminal and a COM-terminal of the IC 13 for driving the switch 8. The above-explained resistors 11 and 12 are drive resistors for driving the switches 7 and 8.
A signal HIN and a signal LIN, corresponding to the respective switches 7 and 8, are inputted to the IC 13. When the above signal HIN is "high", an output HO of the IC 13 becomes "high". When the above signal HIN is "low", an output LO of the IC 13 becomes "low". Similarly, when the above signal LIN is "high", an output LO of the IC 13 becomes "high". When the above signal LIN is "low", an output LO of the IC 13 becomes "low".
Also, in FIG. 24, it is now that a voltage applied to a load constructed of the resistor 5 and the resistor 6 is "VL"; a current flowing through the load is "IL"; a voltage applied between the VS terminal and the COM terminal in the IC 13 is "Vrev"; a current flowing through a wiring line used to connect an emitter of the switch 8 and the COM terminal of the IC 13 is "Irev"; and voltages of the DC power supply 1 and of the DC power supply 2 are "E". It should be noted that plus polarities of the respective voltages and the respective currents are directed, as viewed in FIG. 24.
Next, a description will now be made of a power supplying method to the load with reference to FIG. 24 and FIG. 25. At this time, it is assumed that the above-described load current IL is directed to a plus direction. In FIG. 25, (a) shows an operation of the switch 7; (b) indicates an operation of the switch 8; (c) represents a waveform of the load voltage VL; (d) shows a waveform of the load current IL; (e) represents a waveform of a current flowing through the switch 7; and (f) indicates a waveform of a current flowing through the diode 10.
In the drawings, when the switch 7 is turned OFF and the switch 8 is turned ON, the load voltage becomes "-E", and then the magnitude of the load current IL is decreased. In this case, the above-described load current IL actually does not flow through the switch 8, but flows through the diode 10. Next, when the switch 7 is turned ON and the switch 8 is turned OFF, the load voltage becomes +E. The magnitude of the load current IL is increased. At this time, the load current IL flows through the switch 7. In other words, when the ON/OFF controls of the switches 7 and 8 are carried out, the load voltage VL can be controlled, and therefore the above-explained load current IL can be controlled.
Also, FIG. 26 shows an internal circuit of the above-described IC 13. In this drawing, reference number 21 shows a rising edge detecting circuit for detecting a rising edge of the above-described signal HIN, reference numeral 22 indicates a falling edge detecting circuit for detecting a falling edge of the signal HIN, and reference numeral 23 represents an MOSFET which is turned ON when an output of the rising edge
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Ando Taro
Azuma Satoshi
Daijyo Masakatu
Kuriyama Shigemi
Nishihiro Akinori
Mitsubishi Denki & Kabushiki Kaisha
Sterrett Jeffrey
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