A system and method for combining power from DC power sources. Each power source is coupled to a converter. Each converter converts input power to output power by monitoring and maintaining the input power at a maximum power point. Substantially all input power is converted to the output power, and the controlling is performed by allowing output voltage of the converter to vary. The converters are coupled in series. An inverter is connected in parallel with the series connection of the converters and inverts a DC input to the inverter from the converters into an AC output. The inverter maintains the voltage at the inverter input at a desirable voltage by varying the amount of the series current drawn from the converters. The series current and the output power of the converters, determine the output voltage at each converter.

Distributed Power Harvesting Systems Using DC Power Sources

A monitoring system and method for monitoring performance of individual powers sources in a distributed power source system A monitoring module is coupled to each of the power sources, or to each string of serially connected power sources, to monitor and collect data regarding current, voltage, temperature and other environmental factors at the power source The collected data is transmitted over a power line to a central analysis station for analysis Data collected from each source indicates malfunction or degradation at the source Comparison of data collected from adjacent sources filters for environmental factors impacting neighboring sources such as cloudy days for a solar panel Comparison of data collected from the same source at different times indicates soiling or degradation of the source with time or periodic events such as a moving shade from an adjacent building

Monitoring of Distributed Power Harvesting Systems Using DC Power Sources

Method for distributed power harvesting using DC power sources

A converter circuit providing multiple current bypass routes between the output leads to provide reliability in a series connection of several converters. If the converter malfunctions due to component failure, the current bypass routes provide a path for the current that views the malfunctioning converter as substantially a short. Diodes prevent backflow into the power source connected to the converter. Redundancy is provided in the bypass portions of the converter circuit that provides alternate parallel paths in case a defective component in one of the paths opens the circuit along that path. In one example, the converter is implemented as a buck plus boost converter where either the buck or the boost portion or both are operative responsive to a controller controlling the switches of both portions. Most of the converter circuit may be implemented in an integrated circuit.

Current bypass for distributed power harvesting systems using dc power sources

Encoded transmission and reception which reduces time side lobe are realized while suppressing increase of circuit scale. Transmission signals corresponding to a composite modulation code sequence composed from two or more modulation code sequences are outputted as transmission signals. A reception means demodulates reception signals stepwise by two or more demodulators. The demodulator can be thereby divided into two or more stages, and therefore with a circuit scale corresponding to the sum of the operation circuit numbers of two or more demodulators, time side lobe reduction effect can be obtained at a level equivalent to that obtainable with a circuit scale corresponding to the product of the operation circuit numbers of two or more demodulators.

Ultrasonic diagnostic apparatus

There is provided a calibration method of a detecting section which is provided on a substrate incorporated into a system interconnection generator and which detects by detecting means an object to be detected or an value of the object to be detected. The calibration method comprises the steps of prior to the substrate being incorporated into the system interconnection generator, measuring by the detecting section a reference value of the object to be detected by the detecting section; storing at least one of an error with respect to the reference value measured by the measuring step and the measured value of the reference value in association with the measurement result; and after the substrate being incorporated into the system interconnection generator, outputting the measurement result of the detecting section based on at least one of the error and the measured reference value, stored by the storing step in association with the measurement result.

Method for calibrating a measured value of detecting means

A DC power supply bus is used.to connect a solar cell to an outdoor unit of air conditioners. The output voltage of each outdoor unit is so controlled as to maximize the power generation efficiency of the solar cell and the DC power supplid to the air conditioner is regulated to predetermined value.

Method and apparatus for controlling an air conditioner with a solar cell

PROBLEM TO BE SOLVED: To prevent an adverse effect on an MPPT controlling of an inverter circuit when a flexibility is maintained and a booster circuit starts an operation thereof while avoiding a cost raise. SOLUTION: A control unit 24 sets a maximum value Vmax of a standard input voltage to 0, reads a present standard input voltage Vs detected by a voltage sensor 23, and judges whether booster circuits 16A, 16B are stopping or not. When the booster circuits 16A, 16B are stopping, the control unit 24 reads the standard input voltage maximum value Vmax and compares the standard input voltage maximum value Vmax with the present standard input voltage Vs. When this present standard input voltage Vs is not more than the standard input voltage maximum value Vmax, the control unit 24 determines whether this voltage Vs is less than a value obtained by subtracting a booster circuit starting determining voltage Vn from the standard input voltage maximum value Vmax. When this voltage Vs is less than the value, a timer 25 starts a time check. When this low state continues for a longer time than a starting determining time Tn of an inverter circuit 8 and a timeout occurs, the control unit 24 starts operations of the booster circuits 16A, 16B. COPYRIGHT: (C)2007,JPO&INPIT

Solar power generator

PROBLEM TO BE SOLVED: To provide an air conditioner capable of cooling a control box by an air fan for a heat source side heat exchanger without hindering the flow of the wind of the air fan, and allowing easy mounting of the control box. SOLUTION: In this air conditioner for an automobile where a compressor 1 is driven by a compressor motor 2, a heat sink 18 is attached on a control box 6 accommodating a control circuit of the compressor motor 2 including an inverter circuit, and integrally mounted with a ball mouth 9. The heat sink 18 is provided with radiating fins mounted in the bell mouth for straightening the flow of the wind between the heat source side heat exchanger and the air fan in the direction in parallel with the wind lowing direction. COPYRIGHT: (C)2001,JPO

Air condition for automobile

PROBLEM TO BE SOLVED: To keep an air conditioner operating over a long time without concerning about the consumption of a battery and continuously operating an engine for power generation when parking in a campground or the like. SOLUTION: In an ordinary operation, a compressor 13 in refrigerating cycle composed of the compressor 13, a heat source side heat exchanger 14, an expansion valve 17, an interior heat exchange 18 or the like is electrically driven by supplying the power from a battery B1 through a switch SW2 and an inverter 12. A 100 V plug 7 or a 200 V plug 8 is connected to an external commercial power source when air conditioning a cabin while the parking at a campground or the like. For example, when connecting the 100 V plug, switches SW3, SW4 and SW5 are set on a B side, and the switch SW2 is set on an A side, and the direct current obtained by rectifying the external AC power source by a rectifier Rec, and then smoothening the same by a smoothening capacitor C3 is supplied to the inverter 12 through a DC-DC converter 11.

Hisashi Tokisaki

Papers

Method for calibrating a measured value of detecting means

Method and apparatus for controlling an air conditioner with a solar cell

Solar power generator

Air condition for automobile

Air conditioner for automobile