JPH072835U - Gas air conditioner power circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve a power saving circuit using a solar cell in a gas air conditioner including a heat pump type air conditioner and a gas water heater. A boost rectifier circuit for boosting a commercial voltage to convert it into a direct current, and a single-phase or three-phase inverter for converting the direct current voltage into a frequency-variable alternating current, the output of the inverter driving a compressor of a heat pump type air conditioner. In the power supply circuit of the gas air conditioner, which supplies the power to the motor to control the speed of the motor and supplies the output of the solar cell unit to the input end of the inverter, the single-phase inverter separately provided with the DC voltage. To convert it to AC and supply it to the hot water circulation pump drive motor of the gas heater via a step-down circuit if necessary. [Effect] With a very simple configuration in which a single-phase inverter circuit and, if necessary, a step-down circuit are added to the conventional power supply circuit, the power consumption of the hot water circulation pump of the heater is almost 100% when the rain water is not available in winter Since it can be covered by batteries, it has been possible to realize power saving by using solar cells in winter and summer in gas air conditioners.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply circuit using a solar cell for a gas air conditioner including a heat pump type air conditioner and a gas hot water type heater.

[0002]

[Prior art]

 FIG. 1 shows a conventional power supply circuit of this type, which uses a solar cell 9 having an output of several 100 W (several square meters) in fine weather, and converts this output into 280 V DC by a DC-DC converter 10. Then, by connecting this in parallel to the output terminal of DC 280 V obtained by boosting and rectifying the commercial power source and supplying it to the motor control circuit using the inverter 3, the electric power of the compressor drive motor 4 of the outdoor unit for cooling is supplied. The output of the solar cell 9 is used for a part of the above. In a gas air conditioner that combines an energy-saving inverter type air conditioner and a gas hot water type heater capable of rapid heating, this configuration temporarily converts it into DC during the process of supplying power to the motor control inverter. Since it is necessary, the output of the solar cell unit 5 is applied at this stage.

[0003]

[Problems to be solved by the device]

 However, in the configuration of the gas air conditioner described above, in the winter when the gas hot water type heater is used without using the compressor of the heat pump type air conditioner, the hot water circulation pump is supplied with the commercial 100V voltage through the heating circuit 13. Since the solar cell 9 cannot be used at all, there was a problem that the utilization efficiency of the solar cell 9 was lower than that of an electric air conditioner that uses a compressor for both heating and cooling, and the equipment cost was higher. In view of the above-mentioned problems, the present invention has an object to provide a power supply circuit of a gas air conditioner capable of effectively using the solar cell 9 even in winter.

[0004]

Means for Solving the Problems The present invention, as shown in FIG. 2, boosts a rectifier circuit 2 for boosting a voltage of a commercial power source 1 to convert it into a direct current, and a variable output frequency of the boost rectifier circuit 2. Inverter 3 for converting into single-phase or three-phase AC is provided, and the output of the inverter 3 is supplied to the compressor driving motor 4 of the heat pump type air conditioner to control the frequency of the inverter 3 to control the motor 4 Of the booster rectifier circuit 2 in the power supply circuit of the gas air-conditioning device, in which the output of the solar cell unit 5 is supplied to the input end of the inverter 3 in parallel with the output of the booster rectifier circuit 2. The output is converted into AC by a separately provided single-phase inverter 6, and if necessary, supplied to a pump drive motor 8 for circulating hot water of the gas heater via a step-down circuit 7. It is.

[0005]

[Action]

 According to the above configuration, the pump for hot water circulation of the heater in the winter fine weather or cloudy weather is provided by the extremely simple configuration in which the single-phase inverter 6 and, if necessary, the step-down circuit 7 are added to the conventional power supply circuit. Almost 100% of the power consumption of 8 can be covered by the solar cell 9, and the power consumption of the gas air conditioning system can be saved throughout the heating and cooling season.

[0006]

【Example】

 FIG. 2 shows an embodiment of the present invention. A step-up rectifier circuit 2 for converting a commercial voltage into a required DC voltage is composed of a step-up transformer 11 and an AC-DC converter 12. The output of the circuit 2 is supplied to the frequency-variable three-phase inverter 3 as a DC 280V power source. The output of the inverter 3 is supplied to the compressor drive motor 4 of the heat pump type air conditioner, and the speed of the motor 4 is controlled by controlling the frequency of the inverter 3 according to the room temperature, so that the room temperature is kept constant. The output of the machine is controlled. The output of the solar cell 9 is boosted to a predetermined DC voltage of 280V by the DC-DC converter 10 and connected to the input end of the three-phase inverter 3 in parallel with the output of the boost rectifier circuit 2. About 1/4 to 1/3 of the required power of about 1 kW is shared. In addition, the DC 280V output of the step-up rectification circuit 2 is converted to AC 200V by the single-phase inverter 6, and further reduced to AC 100V by the step-down circuit 9, and via the switch SW controlled by the heating circuit 13, It is supplied to the pump drive motor 8 for circulating hot water of the gas heater, so that the output of the solar cell 9 covers 100% of the required power 120 W to 150 W of the pump 8 in fine weather and boosts it in rainy weather. Electric power is supplied from the commercial power supply 1 via the rectifier circuit 2. If the pump drive motor 8 for 200V is used, the step-down circuit 7 can be omitted.

[0007]

[Effect of device]

 According to the present invention, as described above, the single-phase inverter circuit 6 and, if necessary, the step-down circuit 7 are added to the conventional power supply circuit. Almost 100% of the power consumption of the pump can be covered by solar cells. Therefore, as with electric air conditioners that use inverter-controlled heat pumps for both heating and cooling, the gas air conditioners must use solar cell output during both winter and summer. The advantage is that

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a conventional example.

FIG. 2 is a block circuit diagram of the present invention.

[Explanation of symbols]

 1 Commercial Power Supply 2 Booster Rectifier Circuit 3 Three-Phase Inverter 4 Compressor Drive Motor 5 Solar Cell Unit 6 Single-Phase Inverter 7 Step-Down Circuit 8 Pump Drive Motor 9 Solar Cell 10 DC-DC Converter 11 Booster Circuit 12 AC-DC Converter 13 Heating Circuit SW switch

Claims (1)

[Scope of utility model registration request] 1. A step-up rectifier circuit for boosting a commercial voltage to convert it to a direct current, and a single-phase or three-phase inverter for converting the direct-current voltage to a frequency-variable alternating current, the output of the inverter being of a heat pump type air conditioner. In the power supply circuit of the gas air conditioner, which supplies the compressor drive motor to control the speed of the motor and also supplies the output of the solar cell unit to the input terminal of the inverter, the DC voltage is separately provided. A power supply circuit for a gas air conditioner, which is converted into alternating current by a phase inverter and, if necessary, supplied to a pump drive motor for hot water circulation of a gas heater through a step-down circuit.