JPS58123325A - Power converter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device that converts direct current (magnetic force) into alternating current power, and particularly relates to a power supply device that obtains alternating current power from a power source such as a solar cell.

Photovoltaic power output changes sensitively depending on the weather, clouds, etc. As shown in Figure 1, if the horizontal axis is the current I and the vertical axis is the voltage E, the maximum output point B will change in response to changes in the amount of solar radiation A. It fluctuates as shown in the figure. In order to supply this maximum output to the power system or load, a 14-component power supply device shown in FIG. 2 is usually used. The DC power obtained by the solar cell 1 is converted into AC power of a desired frequency by the inverter 2, and the transformer 3. Waveform improvement filter 4
It is converted into an AC waveform with less distortion through the switch 5, and connected to the power system and load through the switch 5. The control circuit 6 outputs a predetermined control signal C determined by the circuit system and configuration of the inverter 2 in the form 7.
It is a power supply circuit that uses the solar cell 1, the power system, or both as its power source.

The solar cell 1 cannot produce output during inclement weather or at night. When the solar radiation is insufficient, the control circuit 6 opens the switch 5 and stops the inverter operation, so that the control circuit 6 always waits until the amount of solar radiation that enables evening driving is obtained. There is a drawback that power is lost because power is supplied to the control circuit 6.

The purpose of the present invention is to stop the width force supply to the main circuit and control circuit of the magnetic force conversion device when the amount of solar radiation decreases at night or during inclement weather.
An object of the present invention is to provide a power conversion device that saves commercial power.

The present invention includes a solar radiation detector 10 at the output of the Tai I field Kameike 1, and when the solar radiation decreases, the main circuit and the control circuit of the power converter are powered off, and when the solar radiation recovers, the solar radiation detector 10 detects the amount of solar radiation and connects the control power supply 11 via the switch 9゜9'
After the gate pulse was established by the control circuit 6 of the inverter 2 by applying the voltage, the inverter was operated according to the sequence.

An embodiment of the power conversion device according to the present invention will be described with reference to FIG. In the figure, 7 is a protective resistor for supplying the power supply voltage to the solar radiation amount detector, 8 is the solar radiation amount detection circuit 9 and 9' are switches, 10 is the solar radiation amount detector, and 11 is a control power source.

The DC power obtained by the solar cell 1 is converted into AC power of the desired voltage and frequency by the inverter 2 (and then stably supplies power to other three-phase AC power sources and loads via the transformer 3. At night or during inclement weather, the amount of solar radiation decreases, so the solar radiation amount detector 10 opens the switch 9°9' to stop the inverter.
This is to detect and monitor the DC voltage obtained by

When the amount of solar radiation increases and the amount of solar radiation detector 10 is activated, the switches 9 and 9' are closed and the source 11 is activated. Control@1゛If the power supply voltage of the source 11 is established, the control circuit 6 operates, and the gate pulse of the inverter is normal, then the output voltage of the inverter 2 gradually increases to 4 according to the inverter sequence.
Inverter 2 operates from the output of Inushita 1@゛Yakuike 1. Furthermore, when the amount of solar radiation decreases, the solar radiation detector 10 detects the decrease in the amount of solar radiation, and the control signal from the control circuit 6 causes the switch 5 to fully open, disconnecting the commercial power system and load from the inverter, and stopping the inverter 2. do. Furthermore, when the amount of solar radiation decreases, the output of the solar radiation detector 10 is turned off, the switches 9 and 9' are opened, the control power supply 11 is stopped, and the system waits until the amount of solar radiation increases.
・1. An example of the method of detecting solar radiation amount detector 10 is shown in FIGS. 4 and 5. 12 is a comparator, 13 is a setting device that determines the setting voltage of the ratio Mfi device, 14 is a diode for removing the negative voltage of the comparator output, 15 is an inverter Z path of the circuit C, 16 is a transistor, and 17 is a switch. Excitation coils 9 and 9' are operated, and 18 is a solar radiation detector lO which is connected to a constant voltage element 8.
This is a DC-DC converter that supplies power. now,
When the output voltage of the solar cell 1 with high solar radiation is sufficient, the solar radiation detector 10 detects the solar radiation in operation 1 in FIG. 5. When the amount of solar radiation further increases and the constant voltage element 8 passes through the resistor 7 and reaches the power supply voltage of the solar radiation detector 10 via the DC-DC converter 18 in operation 2 in FIG. 5, the solar radiation detector 10 operates. do. The solar radiation detector 10 is a voltage setting device 13
When the amount of solar radiation becomes larger than the set voltage of diode 1, the output of comparator 12 changes from 1" to a negative voltage.
Since 4 is added, the negative value is cut and becomes “0#” IC.
The inverter 15 inverts the signal and turns on the transistor 16. The switch excitation coil 17 is turned on by turning on the transistor 16.
The switches 9 and 9' also operate at the same time. Switch 9
. When the amount of solar radiation is detected by the solar radiation detection circuit in the control circuit, the inverter 2
When a start command is applied to the motor and the movement becomes +'lE3 in Fig. 5,
The inverter starts up, operates according to the sequence, and supplies power to the commercial power system and loads. In addition, when the amount of solar radiation decreases at night or due to bad weather, etc., and the amount of solar radiation decreases to stop 1 in Figure 5, the amount of solar radiation detection circuit in the control circuit detects the decrease in the amount of solar radiation, and the switch 5 is opened to connect the commercial power system and the load. 1r: 117I
tqa and inverter 2 is stopped. Furthermore, the amount of solar radiation is the fifth
When the voltage decreases to stop 2 in the figure, the set voltage of the solar radiation detector 10 becomes smaller and the output of the comparator 12 is reversed from 0" to 1" and becomes uO" at the IC inverter 15. 16 is turned off. When the transistor is turned off, the excitation coil 17 is also turned off, and the switches 9 and 9' are opened, and the control power supply 11 and the control circuit 6 are disconnected, and the control power supply 1
1 stops. When the amount of solar radiation further decreases and reaches stop 3 in Figure 5, the pressure of the constant voltage element 80 becomes lower than 1 when the amount of solar radiation recovers.
0's power supply is also stopped.

According to the operating method of the present invention, as shown in FIG. 6, when the solar radiation amount is applied to the solar cell 1 (a), and when the operating voltage of the solar radiation detector 10 is reached, the solar radiation detector 10 becomes inoperable (b), opening and closing. The control circuits 9 and 9' also operate and the control power is applied (c), and the control circuit 6 operates to perform inverter operation (d). When stopped, the control circuit 6 detects a decrease in solar radiation and stops the inverter, and when the solar radiation decreases further, the control power supply 11 stops, and when the solar radiation decreases further, the power to the solar radiation detector is stopped. .

In this way, the solar radiation detector 10 constantly monitors the output of the solar cell 1, which is determined by the amount of solar radiation, and when the amount of solar radiation decreases, the inverter circuit and control power supply 11 are stopped. This has the effect of improving safety.

Although the control power source 11 was supplied from the output of the solar cell 1, the control f
It is also possible to supply the solar cell 1 with a voltage suitable for the R source voltage. Further, although the battery has been described as a solar cell, it goes without saying that the invention can be similarly applied to a fuel cell.

Furthermore, in the explanation, the AC power supply is assumed to be three-phase, but it can be applied to single-phase as well.

[Brief explanation of the drawing]

Figure 1 shows the output characteristics of a 1-field battery, Figure 2 is a block diagram showing the configuration of a conventional power converter, and Figure 3
4 and 4 are block diagrams and circuit diagrams showing an embodiment of the power converter according to the present invention, and FIGS. 5 and 86 are diagrams showing an operating method. DESCRIPTION OF SYMBOLS 1... Solar cell, 2... Inverter, 3... Transformer, 4... Filter, 5... Switch, 6... Control circuit, 7... Protective resistor, 8...・Constant voltage element, 9,9
'...Switch, No. 2 Prisoner No. 30

Claims (1)

[Claims] 1. Output of solar cells ゛In a magnetic force conversion device equipped with an inverter that converts magnetic force into AC power and operated in parallel with another AC power source, DC power is not converted into AC power. The control source of the inverter is stopped during the time period, and the control power source is turned on during the time period when DC power is converted to AC power, so that the inverter device is automatically operated. Magnetic force conversion device. 2. The power conversion device according to claim 1, wherein the output of the solar cell is used as a control source for the inverter.