Inverter that calculates an average value of direct current DC
First Claim
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1. An inverter comprising:
- an inverter circuit formed of at least one upper-arm switching element and at least one lower-arm switching element connected to a DC power supply, the inverter circuit provides DC with pulse-width modulation so as to output AC to a load;
a current sensor for detecting the current of the load; and
a control circuit programmed to calculate an average value of DC that flows between the DC power supply and the inverter circuit by multiplying the duration of an ON-period in which either the at least one upper-arm switching element or the at least one lower-arm switching element turns on with a current value detected by the current sensor during the ON-period.
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Abstract
An inverter has an inverter circuit and a current detector. In the inverter circuit, upper-arm switching elements and lower-arm switching elements, which are connected to DC power supply, provide DC with pulse-width modulation (PWM) so as to output AC to a load. The current detector detects current of the load. With the structure above, the inverter calculates an average value of DC that flows between the DC power supply and the inverter circuit according to a product of an ON-period in which any one of the switching elements maintains ON and a current value detected by the current sensor.
24 Citations
33 Claims
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1. An inverter comprising:
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an inverter circuit formed of at least one upper-arm switching element and at least one lower-arm switching element connected to a DC power supply, the inverter circuit provides DC with pulse-width modulation so as to output AC to a load; a current sensor for detecting the current of the load; and a control circuit programmed to calculate an average value of DC that flows between the DC power supply and the inverter circuit by multiplying the duration of an ON-period in which either the at least one upper-arm switching element or the at least one lower-arm switching element turns on with a current value detected by the current sensor during the ON-period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification