JPH0720952A - Power unit - Google Patents

Abstract

PURPOSE:To supply stable AC electric power by detecting the output voltage of a solar battery, starting the operation of a power converting device when the power generation output becomes larger than the power consumption of the power converting device, and stopping the operation of the power converting device when the generated power of the solar battery decreases below the power consumption of the power converting device. CONSTITUTION:When solar radiation decreases potentials at the '+' terminal and '-' terminal of a comparator CMP 2 are replaced with each other owing to a decrease in the voltage effect of a current detection resistance R9 and the output of the comparator CMP 2 is inverted to a high potential. Consequently, inputs to the flip-flop consisting of gate elements G1 and G2 are replaced with each other and the output is inverted to a lower potential to stop the converting operation of the power converting device INV1; and the power supply to a load switching relay RV1 is stopped to short-circuit the contact, and an electric power consuming resistances consumes the generated electric power of the solar battery. The generated power of the solar battery is nearly equalized to the power consumption of the power converting device INV1 and the operation point of the comparator CMP 2 is determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, and more particularly to a power supply device used in industrial or consumer electronic equipment.

[0002]

[Prior art]

(1) In recent years, from the viewpoint of energy saving, as a power supply device of this kind, a photovoltaic power generation device that converts sunlight, which is an energy source in the natural world, into electric power by a solar cell has been attracting attention. A wafer, which is the body of this solar cell, has an electromotive force of about 0.5 V per element, and several tens of the wafers are combined to form a solar cell panel. For actual power generation, Electric power is generated by constructing a module that combines several to several tens of the panels.

Further, the outputs of these solar cell modules are connected to a DC-AC power converter, and the DC power taken out from the module is passed through a capacitor for smoothing high-frequency current inside the power converter by a switching element such as a transistor. It is used as a power supply device for industrial or consumer electronic devices by converting to high-frequency power, combining power waveforms to generate an AC waveform, and obtaining AC power as a DC / AC converter output.

(2) On the other hand, as a power supply device for this kind of electronic equipment, the conventional AC-DC converter 67 and charger 68 are configured as shown in the circuit diagram of FIG.
The AC voltage 1 is converted to a DC voltage by the rectifying diode 2 and the smoothing capacitor 3, and the driving circuit and the control circuit 61 drives the switching transistor 4 to form a rectangular wave.
The transformer 62 supplies the energy required by the load 45 and the charger 68. The voltage supplied to the output side is supplied to the input terminal of the charger 68 through the connector or the like.

The supplied voltage controls the switching operation of the switching transistor 34 by the driving circuit / control circuit 65 and the microcomputer 66, and the battery 4
Charge 6 The method of charging the battery 46 is quick charging with constant current, medium speed charging, or trickle charging.
In the constant current control, the current is detected by the current transformer 69, the voltage is converted by the resistors 22 and 23, the peak value is detected by the capacitor 41, and the signal is input to the control terminals of the drive circuit and the control circuit 65 to perform switching. This is performed by turning on and off the transistor 34.

To determine whether or not the battery has been fully charged, the voltage divided by the resistors 30 and 31 is input to the detection port of the microcomputer 66, the port is checked in real time, and the MAX hold is always performed to determine the MAX value. -△
The point V is detected, the point is fully charged, a full charge signal is sent to the drive circuit and control circuit 65, the switching operation of the switching transistor 34 is stopped, and a signal is sent from the microcomputer 66 to the trickle charging transistor 35. To turn on the transistor 35 to perform trickle charging.

[0007]

[Problems to be Solved by the Invention]

(1) However, as for the output of the solar cell in the above item (1), the electric power that can be taken out greatly fluctuates depending on the sunshine and the temperature at that time. Further, since the solar cell has a voltage-current characteristic as shown in FIG. 2, the output current changes in proportion to the amount of incident light, but the output voltage is not so affected. In particular, when the morning and evening sun rises or sinks, the generated power is small, but the output voltage can be generated to some extent. A general DC-AC power converter is configured to activate a converter circuit when it is detected that the input voltage has reached the operating voltage of the power converter.

Here, the solar cell output when the incident light of the solar cell is small and the generated power is small, the output voltage can be output although the current is small. In addition, a large-capacity capacitor for smoothing high-frequency current is usually inserted between the DC input terminals of the power converter, so the solar cell output power keeps charging current flowing through the capacitor and accumulates power, so the capacitor terminal voltage is Go up. As a result, when the input voltage of the power conversion device exceeds the starting voltage of the power conversion circuit, the power conversion device converts the power that is the sum of the power stored in the capacitor and the solar cell output power into AC power.

However, in such a power conversion circuit when the incident light is weak, the output power of the solar cell is smaller than the power required by the conversion device, and therefore the power stored in the input capacitor of the power conversion device is consumed while the AC power is consumed. Since the electric power is generated, the capacitor voltage continues to drop and reaches the operation stop voltage of the power converter to stop the AC power generation. When the operation of the conversion circuit is stopped, the capacitor voltage rises to start charging the capacitor from the solar cell again, and eventually reaches the operation voltage of the conversion circuit to start the conversion operation.

As described above, when the incident light becomes lower than the required power of the AC power conversion circuit, the power conversion device repeatedly operates and stops, and the AC voltage repeatedly rises and falls, resulting in stable AC. There was a problem that power could not be supplied.

(2) Further, in the conventional example in the above (2), since the AC-DC converter 67 and the charger 68 are separate bodies, a drive / control circuit for the AC-DC converter 67 and A drive / control circuit for the charger 68 is required for each individual power supply. Further, since they are mounted on different boards, it is necessary to connect them with a connector or the like. Therefore, as a whole of the power supply device, high cost, large space,
There were problems such as reduced reliability.

The present invention has been made in view of the problems of the conventional example as described above, and (1) It is possible to prevent the repeated increase / decrease phenomenon of the alternating voltage in the alternating current power converter from the solar cell and to stabilize it. It is an object of the present invention to provide a power supply device capable of supplying the above AC power, and (2) provide a power supply device capable of improving space property and reliability at low cost by integrating an AC / DC converter / charger.

[0013]

Therefore, according to the present invention, the power supply device of this type is: (1) When the power conversion device is stopped, the solar cell output power is detected and the generated output is the power output. When it exceeds the power consumption of the converter, it automatically starts the operation of the power converter, and when the power generated by the solar cell decreases and falls below the power consumption of the power converter, the power converter is promptly operated. By configuring to shut down, or (2) by using a microprocessor in the drive / control circuit, for example, the switching operation of the AC-DC converter, the control and the constant current operation of the charger, the control, or the AC -A single control circuit for switching operation and control of DC converter and on / off control of high voltage control transistor of high voltage circuit and constant current operation / control of charger. Dynamic, and configured to control, by integrating the power supply charger, it is intended to achieve the object.

[0014]

With the above-described structure of the present invention, (1) stable start / stop control of the AC power converter is realized,
Alternatively, (2) it is possible to prevent a cost increase, a large space, a decrease in reliability and the like due to the separate configuration of the power supply device / charger as in the conventional case.

[0015]

【Example】

(First Embodiment) The present invention will be described below based on embodiments. FIG. 1 shows a circuit diagram of a first embodiment of a power supply device according to the present invention. In FIG. 1, P1 and P2 are terminals that receive power from the solar cell S, and the DC power that is input from here is
DC-AC power conversion circuit IN via start / stop control circuit
Input to V1. C1 is a DC-AC conversion circuit INV
The smoothing capacitors P3 and P4 connected to the inlet of 1 for absorbing high frequency ripple are outlets of the electric power converted into AC by the DC-AC converter circuit.

R1 and R2 are voltage dividing resistors for detecting the input voltage, and their relay points are connected to the + terminal of the comparator CMP1. R3 is a resistor for passing a current through the reference voltage element,
ZD1 is a Zener diode for creating a reference voltage. R4 and R5 are resistors that add the inflow current to the reference voltage, and the relay point thereof is connected to the-terminal of the comparator CMP1. R6 and R7 are voltage dividing circuits for detecting inflow current, and their relay points are connected to the + terminal of the comparator CMP2. R8 is a bias resistor and is a comparator CM
It is connected to the-terminal of P2. R9 is a resistor that detects a current flowing through the solar cell.

CMP1 is a comparator for determining the starting operation, and its output is connected to G1 which is a NOR gate. CMP2 is a comparator for determining operation stop, and its output is connected to G2 which is a NOR gate.
The outputs of NOR gate elements G1 and G2 are connected to their inputs to form a so-called RS flip-flop. The output of the gate G2 is connected to the operation stop terminal (remote ON / off) of the DC-AC conversion circuit. RY1 is a switching relay for causing the input power to flow through the load resistance RL1, and the operation signal is connected to the output of the gate G2. RL1 is a power load resistance and is a relay R
It is connected to Y1.

Next, the operation will be described; when the solar cell panel is exposed to sunlight, the solar cell S produces an electromotive force, which is applied to the terminals P1 and P2. In this state, the power converter INV1 is not yet in operation and the power detection circuit has not detected the specified power value. Therefore, the contact of the load switching relay RY1 is P of the solar cell output terminal.
RL1 which is a power consumption load is connected to 1 and P2.

The power generated by the solar cell is consumed by the power load RL1 through the contacts of the relay RY1. At this time, the voltage V _S generated by the solar cell is zener diode through the resistor R3.
A flow reference voltage V _R is generated in the drive ZD1.

The voltage V _S generated by the solar cell depends on the resistances R1 and R1.
The potential divided by 2 is input to the + terminal of the comparator CMP1 as a solar cell generated voltage. The negative terminal of the comparator CMP1 has a value obtained by adding a voltage drop due to the reference voltage and the current detection resistor R9. Comparator CMP2
The − terminal is connected to the negative side of the reference voltage circuit, and the + terminal has a value obtained by dividing the potential difference between the reference voltage V _R and the current detection resistor R9 by the resistors R6 and R7.

Here, when the amount of solar radiation is small, the power generated by the solar cell decreases and the voltage drop due to the power load resistance RL1 is small, so the voltage V _S generated by the solar cell is also low and the comparator CM
The + terminal voltage of P1 has a low value. At this time, since the solar cell generated current is also small, the voltage drop of the current detection resistor R9 is small and the − terminal voltage of the comparator CMP1 is high, and the − terminal has a higher potential compared to the + terminal thereof.
The potential of the output terminal of P1 has a low value. Also, since the voltage drop of the current detection resistor R9 is low, the + terminal of the comparator CMP2 has a higher potential than the-terminal, and the comparator CM
The potential of the output terminal of P2 has a high value.

As a result, the output of the RS flip-flop composed of the gate elements G1 and G2 becomes a low potential, the operation of the power converter INV1 continues to be stopped, and the contact of the load switching relay RY1 is powered. Continue to the consumption resistance side. This is because when the solar cell output is low immediately after the start of solar radiation (such as at sunrise), the generated power is consumed by the power consumption load, and the power converter INV1 performs power conversion. Since the operation is prohibited when the power consumption at the time exceeds the power generated by the solar cell S, it is possible to suppress the unstable operation such as when the AC power can hardly be obtained even if the power conversion is performed. You can As a result, it is possible to prevent the phenomenon that the power converter INV1 operates or the operation stop is repeated due to a small amount of solar cell electromotive force, and the operation of the power converter INV1 can be stabilized.

When the amount of solar radiation increases and the power generated by the solar cell increases, the current flowing through the power load resistor RL1 increases and the voltage across the power consumption resistor RL1 increases. Further, since the generated current increases, the voltage drop of the current detection resistor R9 also increases. Therefore, the comparator CMP1 +
The terminal voltage increases in potential due to the increase in voltage between the terminals P1 and P2, and the voltage drop in the current detection resistor R9 also decreases in negative terminal voltage due to this increase in voltage. Therefore, the potentials of the + terminal and the-terminal of the comparator CMP1 are switched, and the output of the comparator CMP1 is inverted and becomes a high potential.

At this time, in the comparator CMP2, the + terminal voltage is lower than the-terminal voltage due to the increase in the voltage drop of the current detection resistor R9, so the output potential of the comparator CMP2 is low. As a result, the inputs of the flip-flops formed by the gate elements G1 and G2 are exchanged, and the outputs are inverted to a high potential, so that the conversion operation of the power conversion device INV1 is started, and the load switching relay RY1 By energizing, the contacts are opened and the power consumed by the power consumption resistance is released.

As the power consumption of the power consumption resistance at this time,
By setting the operating point of the comparator CMP1 so as to have a value larger than the power consumption when the power conversion device INV1 performs the power conversion operation, the AC power is the AC power when the power conversion device INV1 performs the DC-AC conversion. Since the amount is sufficient to supply the load, the power converter I
The NV 1 can continue to convert the power generated by the solar cell 5 into stable AC power.

When the amount of solar radiation decreases in the evening or when it becomes cloudy, the current flowing through the power load resistor RL1 decreases, and the voltage across the power consumption resistor RL1 decreases. Further, since the generated current is reduced, the voltage drop of the current detection resistor R9 is also reduced. Therefore, the positive terminal voltage of the comparator CMP1 decreases in potential due to the voltage decrease between the terminals P1 and P2, and the negative terminal voltage increases due to the decrease in voltage drop of the current detection resistor R9. So the comparator CMP1
The potential of the + and-terminals of the
The output of P1 is inverted and becomes a low potential.

In the comparator CMP2 at this time, the + terminal voltage rises due to the decrease of the voltage drop of the current detection resistor R9, but when it is lower than the potential of the-terminal, the comparator CMP2.
The output potential of MP2 is low. At this time, the inputs of the flip-flops constituted by the gate elements G1 and G2 both become low potential, and the outputs of the flip-flops are held, so that the state change of the device does not occur. This means that even if the amount of power generated by the solar cell decreases and the starting power of the power converter is interrupted, the amount of power generated by the battery exceeds the power consumption of the power converter, so power can be converted as effectively as possible. Makes it possible.

If the amount of solar radiation further decreases from this state, the solar cell generated current decreases, and the + terminal voltage rises above the-terminal voltage due to the decrease in the voltage drop of the current detection resistor R9. Therefore, the + and-terminals of the comparator CMP2. The potentials of the two are switched, and the output of the comparator CMP2 is inverted and becomes a high potential. As a result, the inputs of the flip-flops formed by the respective gate elements G1 and G2 are exchanged, and the outputs are inverted to a low potential, so that the conversion operation of the power conversion device INV1 is stopped, and the load switching relay RY1 is turned off. By stopping energization, the contacts are short-circuited and the power consumption resistance consumes the power generated by the solar cell.

By setting the operating point of the comparator CMP2 so that the power generated by the solar cell at this time is substantially equal to the power consumption of the power converter INVF1, the power converter INV1 can operate as follows.
When the power generated by the solar cell 5 exceeds the generated power, the operation can be prohibited, and the unstable operation when the AC power can hardly be obtained even if the power conversion is performed can be suppressed. As a result, the power converter INV1 operates due to the low solar cell electromotive force ,. It is possible to prevent a phenomenon that the operation is repeatedly stopped and stabilize the operation of the power conversion device.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
FIG. 3 is a circuit diagram of the embodiment of FIG. 4 and is an example in which the voltage detection circuit is simplified. The same (corresponding) components as those in FIG. 1 are represented by the same reference numerals, and the duplicated description of each component is omitted. The same applies to the following third and fourth embodiments.

In the present embodiment, the fact that the output voltage of the solar cell is proportional to the current flowing through the power consumption load resistor RL1 is utilized, and the resistor R2 is connected in series to the power consumption load resistor RL1. By generating a voltage proportional to the solar cell output voltage V _S across the resistor R2 and using that voltage as the battery output detection voltage,
Since the high-voltage voltage dividing circuit in FIG. 1 can be omitted, there are advantages that the circuit configuration is simplified and the number of parts is reduced.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention.
2 is a circuit diagram of the embodiment of FIG. 1 and is an example in which a logic circuit is simplified. When the start terminal and the stop terminal, which are external input terminals for controlling the operation of the DC-AC power converter INV1, are independent, the comparator CMP1 is provided as shown in FIG.
A positive feedback resistor R10 is connected to the + terminal from the output of the above, and the detected power value at the time of starting is made higher than the power consumption value at the time of stopping.

The output of the comparator CMP1 is connected to the remote on (start) terminal of the power converter to bring the output terminal to a high potential when the specified solar cell output power value is reached, and the converter starts operating. The output of the comparator CMP2 at this time has a low electric potential because the current value of the current detection resistor R9 is large, and the output of the comparator CMP2 is low.
Since the output of No. 1 is a high potential, the load switching relay RY1 is energized to open the contact, thereby performing the operation of opening the power consumed by the power consumption load RL1.

When the battery output power decreases,
The voltage drop of the current detection resistor R9 decreases and the comparator CM
When the + terminal voltage of P2 rises, the output terminal becomes a high potential, and when the high potential is input to the remote off (stop) terminal of the power converter INV1, the converter stops operation and the load switching relay. By closing the contacts because the energization of RY1 is stopped, the power consumption load RL1
The operation to consume the battery generated power is performed. The above configuration has the advantage that the logic circuit becomes unnecessary and the circuit configuration becomes simple.

(Fourth Embodiment) FIG. 5 shows a fourth embodiment according to the present invention.
FIG. 9 is a circuit diagram of the embodiment of the present invention, which is an example in which a direct current detection element CS1 is used for detecting a solar cell output current. When the current detection resistor R9 is used in series in the circuit for detecting the output current of the solar cell S as shown in FIGS. 1, 3 and 4, power loss is generated in proportion to the square of the current flowing through the resistor. Device INV
Since the effective power supplied to No. 1 is reduced, the power generation efficiency of the power generator can be improved by using the DC current detecting element CS1 using the Hall element or the like as in this embodiment.

Further, in such a current detecting element CS1, a portion for measuring a normal current and a signal output portion are insulated, so that the power detection type start-stop control circuit can be electrically insulated from a large current portion. Therefore, the structure of the detection circuit is simplified. Also, because it is insulated, it is easy to increase the safety of the circuit in the event of a ground fault.

(Fifth Embodiment) FIG. 6 shows a circuit side of an embodiment which best shows the features of the power supply device with a built-in charger according to the present invention. The same (corresponding) constituent elements in FIG. 9 of the conventional example are designated by the same reference numerals. In FIG. 6, 1 is an AC power supply, 2 is a rectifying diode, 3 is a smoothing capacitor, 4 is a switching transistor, 5 is a drive circuit for the switching transistor 4, 6 is a load 45 and a battery 46 for transmitting energy. Reference numeral 7 is a transformer for driving the switching transistor 4, and 8 is a transformer for supplying power to the control circuit 47 including a microprocessor.

9 is a rectifying diode, 10, 11, 12,
13, 14, 15, 16, and 17 are diodes, 1
8, 19, 20, 21, 22, 23, 24, 25, 2
6, 27, 28 and 29 are resistors, 30 and 31 are battery voltage detecting resistors, 32 and 33 are output voltage detecting resistors, and 34.
Is a switching transistor in the charging portion, 35 is a trickle charging transistor, and 36, 37, 38 and 39 are respective transistors.

Reference numeral 40 is a smoothing capacitor, 41 is a constant current value detecting capacitor, 42 and 43 are capacitors, 44 is a three-terminal regulator, 45 is a load, 46 is a battery, 47 is a control circuit including a microprocessor, and 48 is a choke. The coil 69 is a current transformer for constant current control.

When the AC power supply 1 is applied, a DC voltage is applied to the control circuit 47 including the microprocessor through the transformer 8, and the control circuit 47 including the microprocessor is applied.
Works. When the control circuit 47 operates, the pulse voltage is supplied to the drive circuit 5 of the switching transistor 4 through the transformer 7, the switching transistor 4 performs the switching operation, and the energy required by the load 45 and the battery 46 is supplied to the transformer 6. Is supplied to the load 45 and the battery 46 via.

The voltage supplied to the load 45 is controlled by the control circuit 47 to the voltage required by the load 45. In addition, the control circuit 47 is utilized by using the output voltage that has been converted into a constant voltage.
Thus, the switching transistor 34 for the charger is switched to charge the battery 46.

A constant current is required to charge the battery 46. In the circuit for constant current control, the pulse current value detected by the current transformer 69 is turned on by the transistor 37, voltage is converted by the resistors 22 and 23, the peak value is peak-held by the capacitor 41, and the voltage value is controlled by the control circuit. It is input to the control port of the switching transistor 34 of 47, and performs constant current control.

This state is rapid charging, and if charging is performed in this state for a certain time or longer, there is a risk of the battery 46 bursting due to heat generation or the like of the battery 46. In order to prevent this, when the rapid charging continues for a certain time or longer, the control circuit 4
The timer of 7 forcibly turns off the transistor 37 and switches to medium speed charging. Alternatively, the point where the voltage of the battery 46 drops by -ΔV during the rapid charging is detected by the control circuit 47 by the resistors 30 and 31, the point is fully charged, the switching transistor 34 is turned off, and the transistor 3 is turned on.
Turn on 5 to perform trickle charging.

The feature of this embodiment is that a microprocessor is used for the control circuit 47. By controlling the power supply device and the charger by this method, the control circuit can be unified, and at the same time, the power supply device and the charger can be integrated with each other. It is possible to prevent the cost increase, the large space, the deterioration of reliability, and the like, which are caused by the separate charger. This allows
A low-cost, space-saving, highly reliable charger-integrated power supply device can be realized. For example, in the conventional method, two boards, that is, a power supply device and a charger, are required, and connection by a connector or the like is required. By integrating this, in the actual example, the area ratio was reduced by 20%, and the failure time was 5%.
We were able to increase the cost, and we were able to reduce costs by 10%.

(Sixth Embodiment) FIG. 7 shows a circuit diagram (corresponding to FIG. 6) of the charger-integrated power supply device according to the sixth embodiment. The same (corresponding) constituent elements as those in FIG. 6 of the first embodiment are represented by the same reference numerals, and the duplicated description of the reference numerals 1, 2, to 48 will be omitted. In FIG. 7, 49, 50, 51 are high voltage capacitors, 52, 53, 54 are high voltage diodes, 5
Reference numeral 5 is a current limiting resistor, 56 and 57 are respective resistors, 58 is a high voltage controlling transistor, 59 is a high voltage load, and 69 is a constant current controlling current transformer.

When the AC power supply 1 is applied, a DC voltage is applied to the control circuit 47 including the microprocessor through the transformer 8, and the control circuit 47 including the microprocessor is applied.
Works. When the control circuit 47 operates, the pulse voltage is supplied to the drive circuit 5 of the switching transistor 4 via the transformer 7, the switching transistor 4 performs the switching operation, and the load 45, the battery 46, and the high-voltage load 5
The energy required by the load 9 through the transformer 6
5, battery 46 and high voltage load 59.

The voltage supplied to the load 45 is controlled by the control circuit 47 to a voltage required by the load 45. The voltage supplied to the high voltage load 59 is controlled by the high voltage control transistor 58 through the control circuit 47 to a voltage required by the high voltage load 59. Further, by using the output voltage that has been made constant, the control circuit 47 causes the switching transistor 34 for the charger to perform a switching operation to charge the battery 46.

A constant current is required to charge the battery 46. In the circuit for constant current control, the pulse current value detected by the current transformer 69 is turned on by the transistor 37, voltage is converted by the resistors 22 and 23, the peak value is peak-held by the capacitor 41, and the voltage value is controlled by the control circuit. It is input to the control port of the switching transistor 34 of 47, and performs constant current control.

This state is rapid charging, and if charging is performed in this state for a certain time or longer, there is a risk of the battery 46 bursting due to heat generation of the battery 46 or the like. To prevent this
When the rapid charging continues for a certain time or longer, the timer of the control circuit 47 forcibly turns off the transistor 37,
Switch to medium speed charging. Alternatively, the battery 46
The point where the voltage of -lowered by -ΔV
It is detected by the control circuit 47, the point is fully charged, the switching transistor 34 is turned off, the transistor 35 is turned on, and trickle charging is performed.

The feature of the sixth embodiment resides in that a microprocessor is used for the control circuit 47, as in the fifth embodiment. By controlling the high-voltage integrated power supply device and the charger by this method, the control circuit can be unified, and at the same time, the high-voltage integrated power supply device and the charger can be integrated. High cost that occurs because the high voltage integrated power supply and the charger are separate,
It is possible to prevent a wide space and decrease in reliability.
As a result, a low-cost, space-saving, highly reliable charger-integrated power supply device can be realized.

(Seventh Embodiment) FIG. 8 is a circuit diagram (corresponding to FIGS. 6 and 7) of a seventh embodiment of the charger-integrated power supply device. Duplicated description of the same (corresponding) components 1, 2, to 48 in FIGS. 6 and 7 will be omitted. In FIG.
Reference numeral 60 is an electronic device control circuit, and 69 is a current transformer for constant current control. When the AC power supply 1 is applied, a DC voltage is applied to the control circuit 47 including the microprocessor via the transformer 8, and the control circuit 47 including the microprocessor operates. When the control circuit 47 operates, the pulse voltage is supplied to the drive circuit 5 of the switching transistor 4 via the transformer 7, the switching transistor 4 performs the switching operation, and the energy required by the load 45 and the battery 46 is supplied to the transformer 6. It is supplied to the load 45 and the battery 46 via. The voltage supplied to the load 45 is controlled by the control circuit 47 to a voltage required by the load 45.

The control circuit 47 causes the switching transistor 34 for the charger to perform a switching operation by using the output voltage which has been made into a constant voltage, and the battery 46 is charged. The operating state and the standby state of the load 45 at this time are determined based on the communication data from the device control circuit 60.
When the load 45 is in the standby state, the switching transistor 34 is operated and the battery 46 is charged, as judged by the microprocessor of 7. A constant current is required to charge the battery 46. The circuit for controlling the constant current uses the pulse current value detected by the current transformer 69 as the transistor 3
7, the voltage is converted by the resistors 22 and 23, the peak value is peak-held by the capacitor 41, and the voltage value is input to the control port of the switching transistor 34 of the control circuit 47 to perform constant current control. This state is rapid charging, and if charging is performed in this state for a certain time or longer, there is a risk of the battery 46 bursting due to heat generation of the battery 46 or the like. In order to prevent this, when rapid charging continues for a certain period of time or more, the timer of the control circuit 47 forcibly turns off the transistor 37 and switches to medium speed charging. Alternatively, during the rapid charge, the control circuit 47 detects the point where the voltage of the battery 46 has decreased by -ΔV by the resistors 30 and 31, the point is fully charged, the switching transistor 34 is turned off, and the transistor 35 is turned on. Turn on and charge trickle.

The feature of the present invention resides in that a microprocessor is used for the control circuit 47 as in the fifth and sixth embodiments. With this system, the same effects as those in the respective embodiments can be obtained. .

[0054]

As described above, according to the present invention, (1) when the output voltage and output current of solar cell generated power are below the minimum power of the DC-AC power converter,
By causing the power consumption load to consume the battery generated power, the power converter is prevented from erroneously starting, and when the battery generated power exceeds the power required by the converter, the converter is operated and power to the power consumption load is reduced at the same time. By stopping the supply, the effective conversion power can be increased.

By making the battery-generated power when the power converter is stopped equal to the minimum required power of the converter,
Even when the solar cell output power decreases, the battery output can be maximized. Further, when the battery output power becomes equal to or lower than the minimum required power, the power conversion is stopped and the output of the battery is consumed by the power consumption load.
The stop control can be reliably performed. By performing such start-up / stop control, stable automatic self-sustained operation of the AC power generation device using unstable DC power such as solar power can be realized.

(2) According to the charger integrated power supply device of the present invention, by using a microprocessor for the control circuit, the power supply device and the charger are controlled by one control circuit, and at the same time the power supply device and By integrating with the charger, low cost, space saving and high reliability are possible.
In addition, by communicating with the device control circuit, the battery is charged when the device load is in the standby state, and it is controlled so that it does not charge during operation. As a result, the power supply device and the charger can be integrated, and the above effect can be realized.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a first embodiment.

FIG. 2 Power generation characteristics of solar cell (voltage-current curve)

FIG. 3 is a circuit diagram of a second embodiment.

FIG. 4 is a circuit diagram of a third embodiment.

FIG. 5 is a circuit diagram of a fourth embodiment.

FIG. 6 is a circuit diagram of a fifth embodiment.

FIG. 7 is a circuit diagram of a sixth embodiment.

FIG. 8 is a circuit diagram of a seventh embodiment.

FIG. 9 is a circuit diagram of an example of a conventional power supply / charger.

[Explanation of symbols]

 CS1 DC current detector INV1 DC-AC power conversion circuit RL1 Power load resistance S Solar cell 1 AC power supply 47 Control circuit including microprocessor 60 Electronic device control circuit 61 AC-DC converter drive / control circuit 65 Charger drive / Control circuit 67 AC-DC converter 68 Charger

Claims (6)

[Claims] 1. A direct current power source for generating direct current power, such as a solar cell, and a direct current-alternating current power converter for converting the direct current power into alternating current power. When the power converter is in a stopped state, the output of the direct current power supply is used. A power supply device provided with a power consumption load, configured to disconnect the load when the power consumption exceeds a predetermined value and perform a predetermined DC-AC conversion operation by the power conversion device. 2. A direct current power source for generating direct current power, such as a solar cell, and a direct current-alternating current power converter for converting the direct current power into alternating current power. A power supply device configured to stop the conversion operation and apply a load for power consumption to the DC power supply when detecting that the input power falls below a predetermined value. 3. A direct current power source for generating direct current power, such as a solar cell, and a direct current-alternating current power conversion device for converting the direct current power to alternating current power. The power consumption load of the direct current power supply is disconnected to operate the power conversion device. The predetermined power when making the
The power supply device according to claim 1 or 2, wherein the input power of the power converter is set to be larger than the conversion stop power when the conversion operation is stopped. 4. A power supply device characterized in that a microprocessor is used for a control circuit for simultaneously controlling the power supply device and the charger, and the power supply device and the charger are integrally formed. 5. The power supply device according to claim 1, wherein the power supply device is a power supply device including a high voltage. 6. The power supply device according to claim 4, wherein the power supply device and the charger are configured to be controlled by communicating with a control circuit of an electronic device.