JPH05184151A - Power supply - Google Patents

Abstract

PURPOSE:To feed AC power efficiently to a load by a transformerless constitution wherein N capacitors are connected in series and charged while feeding power to the load when a rectified voltage is lower than a predetermined level whereas the rectified voltage is interrupted when it exceeds the predetermined level and the N capacitors are connected in parallel and discharged to the load. CONSTITUTION:A switch control circuit 4 short-circuits a switch 5 to feed power from an AC power supply 1 through the switch 5 to capacitors 7, 8, 9 and a load 12 when the output voltage from a rectifying circuit 2 increases from 0 and before reaching a first voltage generated from a first voltage generating circuit 3. When the output voltage of the rectifying circuit 2 exceeds the first voltage, the switch control circuit 4 opens the switch 5 and a power supply detecting circuit 10 turns transistors 11h, 11j in a capacitor connection control circuit 11 ON to connect the capacitors 7, 8, 8 in parallel thus feeding the load 12 with charging power. When the output voltage from the rectifying circuit 2 subsequently reaches a peak and then lowers to the first voltage, the switch 5 is short-circuited again.

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 for equipment such as a jar pot, a rice cooker, an iron, and a vacuum cleaner, and an overall power supply equipment in which an electronic circuit used in the equipment is not insulated from a commercial power supply. It is a thing.

[0002]

2. Description of the Related Art In recent years, electric appliances used at home have been generally equipped with electronic circuits including active elements. When an electronic circuit is mounted on a device, its configuration is generally composed of a power supply circuit and other electronic circuits.
For convenience of description below, the commercial power supply will be referred to as a primary circuit. An example of the power supply of the above-described conventional primary circuit will be described below with reference to FIG. 7. Reference numeral 1 is a commercial AC power supply, and 18 is an autotransformer for adjusting the voltage of the commercial AC power supply 1 to an appropriate level. 19 is a rectifier, 20
Is a capacitor, and 12 is an electronic circuit that serves as a load.

The operation of the conventional power supply circuit configured as described above will be described. The AC voltage of the commercial AC power supply 1 is dropped by the auto transformer 18 to an appropriate level. The dropped AC voltage is rectified by the rectifier 19, then smoothed by the capacitor 20 and converted into a DC voltage. The DC voltage obtained at the output at this time is determined by the output voltage of the autotransformer 18.

[0004]

However, since the power supply device having the above configuration uses the transformer,
There are problems that the amount of materials used is large, the cost is high, the cost is hard to decrease, the weight is heavy, the size is large, the efficiency is low, and the heat is generated a lot.

The present invention intends to solve the problems of the conventional method and to realize a power supply device that is easy to use. The AC power supply has a structure without a transformer. It is a first object of the present invention to provide a power supply device capable of efficiently supplying the electric power of the above to the load. Also, to provide the second means, the third means, the fourth means, the fifth means, and the sixth means to achieve the first purpose, the second purpose, the third purpose, the It has four purposes, fifth purpose, and sixth purpose.

[0006]

A first means of the present invention for achieving the first object is to provide a rectifying circuit connected to an AC power source and a first voltage generating circuit for generating a first voltage. When,
N capacitors, a switch for turning on / off power supply to the N capacitors and the load, and a switch for turning on the switch when the output voltage of the rectifier circuit is between 0 and the first voltage, and other outputs A switch control circuit that controls the switch so that it is turned off at the time of voltage, a power supply detection circuit that detects the presence or absence of power supply to the load and the capacitor, and N capacitors are connected in series at the time of power supply. The power supply device is provided with a capacitor connection control circuit that controls so that N capacitors are connected in parallel to the load at the time of supply.

A second means of the present invention for achieving the second object is a rectifying circuit connected to an AC power source, a first voltage generating circuit for generating a first voltage, and N capacitors. A switch for turning on / off the power supply to the capacitor and the load, and a switch for turning on the switch when the output voltage of the rectifier circuit is between 0 and the first voltage, and turning off for other output voltages. A switch control circuit for controlling the switch, a first power supply detection circuit for detecting a first voltage to detect that power is being supplied, and an output of the first power supply circuit for supplying N power. The power supply device is provided with a capacitor connection control circuit that controls so that the capacitors are connected in series and that N capacitors are connected in parallel to the load when no power is supplied.

A third means of the present invention for achieving the third object is a rectifying circuit connected to an AC power source, a first voltage generating circuit for generating a first voltage, and N capacitors. A switch for turning on / off the power supply to the capacitor and the load, and a switch for turning on the switch when the output voltage of the rectifier circuit is between 0 and the first voltage, and turning off for other output voltages. A switch control circuit for controlling the switch, and a second switch for detecting the power supply by detecting the output voltage applied in series to the N capacitors generated by the power supply to the load and the capacitor when the switch is short-circuited. By the output of the power supply detection circuit and the second power supply detection circuit, N capacitors are connected in series when power is supplied, and N capacitors are connected to the load when power is not supplied. Te in which a power supply device equipped with a condenser connection control circuit for controlling so as to be connected in parallel.

A fourth means of the present invention for achieving the fourth object is to provide a rectifying circuit connected to an AC power source, a first voltage generating circuit for generating a first voltage, and N capacitors. And a switch for turning on / off the power supply to the capacitor and the load, and a switch for turning on the switch when the output voltage of the rectifier circuit is between 0 and the first voltage and turning it off at other voltages. A switch control circuit for controlling the power supply, a third power supply detection circuit for detecting power supply by detecting a current flowing through a load and a capacitor when the switch is short-circuited, and an output of the third power supply detection circuit for N when power is supplied. Power supply with a capacitor connection control circuit that controls so that N capacitors are connected in series, and N capacitors are connected in parallel to the load when no power is supplied. It is an location.

A fifth means of the present invention for achieving the fifth object is to provide a rectifying circuit connected to an AC power source, a first voltage generating circuit for generating a first voltage, and N capacitors. And a switch for turning on / off the power supply to the capacitor and the load, and a switch for turning on the switch when the output voltage of the rectifier circuit is between 0 and the first voltage and turning it off at other voltages. Switch control circuit for controlling power, a fourth power supply detection circuit for detecting power supply by a switch short-circuit and open control signal, and N capacitors connected in series at the time of power supply by the output of the fourth power supply detection circuit In addition, the power supply device is provided with a capacitor connection control circuit that controls so that N capacitors are connected in parallel to the load when power is not supplied.

A sixth means of the present invention for achieving the sixth object is to provide a rectifying circuit connected to an AC power source, a first voltage generating circuit for generating a first voltage, and N capacitors. And a switch for turning on and off the power supply to the capacitor and the load, and turning on the switch when the output voltage of the rectifier circuit is between 0 and the first voltage, and turning it off at other voltages. A switch control circuit for controlling the switch, a fifth power supply detection circuit for detecting power supply by detecting short circuit and open of the switch, and N capacitors at the time of power supply by the output of the fifth power supply circuit. Are connected in series, and a power supply device is provided with a capacitor connection control circuit that controls so that N capacitors are connected in parallel to the load when no power is supplied.

[0012]

According to the first means of the present invention, when the AC voltage rectified by the rectifying circuit is between 0 and the first voltage obtained by the first voltage generating circuit, the switch control circuit operates in the rectifying circuit. By short-circuiting the switch connected to the output, the capacitor is charged with the electric power of the AC power source and the load is supplied with electric power. At this time, due to the functions of the power supply detection circuit and the capacitor connection control circuit, N capacitors are connected in series to the power supply line when power is supplied, and N capacitors are parallel to the load when power is not supplied. The power supply to the load is performed by these capacitors.

The second means of the present invention to the sixth means of the present invention operate in the same manner as the first means of the present invention. It is executed based on the voltage of. Further, in the third means, the power supply is detected by detecting the voltage on the output side of the switch. The fourth means detects the current flowing through the output side of the switch for power supply, the fifth means detects the switch opening / closing control signal, and the sixth means detects between the two terminals of the switch. The change in voltage is detected and executed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply device according to an embodiment of the first means of the present invention will be described below with reference to FIG. In this embodiment, the case where the number of capacitors is N = 3 will be described. 1 is an AC power supply, 2 is a rectifier circuit connected to the A side of the AC power supply 1,
In this embodiment, a positive half-wave rectifier circuit is used. Reference numeral 3 is a first voltage generating circuit for generating a first voltage, the output of which generates a first voltage, which is connected to the switch control circuit 4. There are the following three types of the first voltage. First, a voltage that is constant even if the voltage of the AC power supply 1 fluctuates, and secondly, a voltage that is proportional to a constant conduction angle of the AC power supply 1,
Third is the mixed voltage of the two. In this embodiment, a configuration for outputting the first constant voltage is adopted. The output of the switch control circuit 4 is connected to the switch 5, and the switch control circuit 4 outputs a control signal for short-circuiting the switch 5 when the output voltage of the rectifier circuit 2 is between 0 and the first voltage. A control signal for opening the switch 5 is output at other voltages. A diode 6 is connected to the output of the switch 5. The diode 6 is for protecting the emitter-collector reverse bias of the transistor of the switch 5 when the output voltage of the rectifier circuit 2 is lower than the output voltage of the switch 5. At the output of the diode 6, a capacitor 7 which is one of the above-mentioned three capacitors, a diode 11a constituting a capacitor connection control circuit 11 described later, a capacitor 8 and a diode 11b, and a capacitor 9 are connected in series. It is connected. The other end of the capacitor 9 is connected to the B side terminal of the AC power supply 1. Reference numeral 10 is a power supply detection circuit, which detects whether or not power is supplied to the load 12 and each of the capacitors by short-circuiting or opening the switch 5 by observing the state change of voltage / current or control signal of each part. However, a signal for driving the capacitor connection control circuit 11 connected to the next stage is sent. Condenser connection control circuit 11
Receives the signal from the power supply detection circuit 10 and performs the following control. That is, first, when the switch 5 is short-circuited to supply power to the load 12 and the capacitors 7/8/9, the capacitors 7/8/9 are equivalently connected to the output terminal D of the diode 6 and the AC power supply 1. The circuit is controlled so as to be connected in series with the B-side terminal of. Secondly, while the switch 5 is open and the power supply is stopped, the capacitors 7, 8 and 9 are equivalently connected in parallel to the load 12, and the power is supplied from the capacitors to the load 12. Control to be supplied.

The structure of the capacitor connection control circuit 11 is as follows.
It is as follows. A diode 11c and a transistor 1 are provided at a connection point between the capacitor 7 and the diode 6.
1h collector / emitter / load 12 / diode 11
d is connected in series to the other end of the capacitor 7. The base of the transistor 11h is connected to the output of the power supply detection circuit 10 via the resistor 11i. Similarly, at the connection point between the capacitor 8 and the diode 11a,
The diode 11e, the collector / emitter of the transistor 11j, the load 12, and the diode 11f are connected in series to the other end of the capacitor 8. Transistor 11j
The base is a power supply detection circuit 1 via a resistor 11k.
It is connected to the 0 output. At the connection point between the condenser 9 and the diode 11b, the diode 11g and the load 1
2 is connected. The power supply detection circuit 10 generates a signal to turn off the transistors 11h and 11j when the switch 5 is short-circuited and power is supplied, and power is supplied when the switch 5 is open. If not, a signal for turning on the transistors 11h and 11j is generated.

The operation of this embodiment will be described below. The switch control circuit 4 continues to send a signal to the switch 5 to short-circuit the switch 5 until the output voltage of the rectifier circuit 2 starts to rise from 0 and reaches the first voltage generated by the first voltage generation circuit 3. ing. Therefore, during this period, the power of the AC power supply 1 is supplied to the capacitors 7, 8 and 9 and the load 12 via the switch 5. At this time, the power supply detection circuit 10 outputs a signal for turning off the transistors 11h and 11j of the capacitor connection control circuit 11. Therefore, between the collector and emitter of each transistor,
It is open to the equivalent circuit. Therefore, the capacitor 7, the diode 11a, the capacitor 8, the diode 11b, and the capacitor 9 are connected in series between the output terminal D of the diode 6 and the B-side terminal of the AC power supply 1. The load 12 is equivalently connected to the capacitor 9 in parallel. Therefore, when the switch 5 is short-circuited, the current flowing through the switch 5 is
• Flow through 8 and 9 to charge these capacitors. At the same time, power is supplied to the load 12.

When the voltage of the output terminal C of the rectifier circuit 2 rises and exceeds the first voltage, the switch control circuit 4 outputs a signal for opening the switch 5. Therefore, the switch 5 is opened, and the power supply to the capacitors 7, 8 and 9 and the load 12 is stopped. At the same time, the power supply detection circuit 10
Transistor 11h of the capacitor connection control circuit 11
A signal for turning on 11j is output. Thus, for example, the capacitor 7 includes the diode 11c and the transistor 11h.
It forms a closed circuit with the collector, the emitter, the load 12, and the diode 11d. Therefore, the charging power of the charged capacitor 7 is supplied to the load 12. Similarly, the capacitors 8 and 9 also supply charging power to the load 12. At this time, the diodes 11a and 11b are connected to the load 1
Since the same voltage is applied between the two terminals, reverse bias is applied and the interference between the capacitors is eliminated. In addition, the diodes 11c, 11e, 11
g prevents the reverse bias between the collector and the emitter of the transistors 11h and 11j, and the capacitors 7 and 8
This prevents a steep current from flowing from one capacitor to another due to variations in the voltage between the terminals of the capacitor 9.

After that, when the output voltage of the rectifier circuit 2 reaches its peak and then drops again to reach the first voltage, the switch 5 is short-circuited again and the capacitors 7, 8 and 9 and the load 12 are connected.
Supply power to. By repeating the above steps, the load 12 is always the AC power source 1 or the capacitor 7.
・ Power is supplied from August 9th.

Next, an embodiment of the second means of the present invention will be described with reference to FIG. The same elements as those in the embodiment of the first means are designated by the same reference numerals, and the description thereof will be omitted.
3 is a first voltage generating circuit, which is a constant voltage diode 3a.
And resistor 3b. That is, the cathode of the constant voltage diode 3a is connected to the output terminal C of the rectifier circuit 2, and one end of the resistor 3b is connected to the anode. The other end of the resistor 3b is connected to the B side terminal of the AC power supply 1. The output voltage of the first voltage generation circuit 3 is connected to the switch control circuit 4 from the connection point E of the constant voltage diode 3a and the resistor 3b. The switch control circuit 4 is
It consists of resistors 4a, 4c and 4e and transistors 4b and 4d. One end of the resistor 4a is connected to the output point E of the first voltage generating circuit 3, and the other end is connected to the base of the transistor 4b. The emitter of the transistor 4b and the emitter of the transistor 4d are connected to the B side terminal of the AC power supply, and the collector of the transistor 4b is connected to the resistor 4c.
Is connected to the output terminal C of the rectifier circuit 2 via. The base of the transistor 4d is connected to the collector of the transistor 4b, and the switch control circuit 4 is connected to the collector.
The resistor 4e which is the output of is connected. Resistor 4e
The other end of is connected to the switch 5. Reference numeral 13 is a first power supply detection circuit, which is composed of a resistor 13a and a transistor 13b. That is, the resistor 13
One end of a is connected to the output terminal E of the first voltage generating circuit 3,
The other end is connected to the base of the transistor 13b.
The emitter of the transistor 13b is connected to the B side terminal of the AC power supply, and the collector is the output of the first power supply detection circuit and is connected to the capacitor connection control circuit 11.

The operation of this embodiment will be described below. The switch control circuit 4 is off until the output voltage of the rectifier circuit 2 reaches 0 and reaches the first voltage, which is the operating voltage of the constant voltage diode 3a forming the first voltage generating circuit 3. .. That is, the transistor 4a has no voltage applied to its base. At this time, the transistor 4d is turned on because the bias is given by the resistor 4c. Therefore, a current flows from the emitter base of the transistor forming the switch 5 to the collector / emitter of the transistor 4d via the resistor 4e. That is, the switch 5 is turned on. On the other hand, the first power supply detection circuit 13
The transistor 13b constituting the transistor is off like the transistor 4b. Therefore, the current flowing through the switch 5 passes through the diode 6 and the condenser 7 / diode 11
It flows to a, the condenser 8, the diode 11b, and the condenser 9. At the same time, via the diode 11g,
A current also flows through the load 12. In this way condenser 7
8 and 9 are charged, and the load 12 is supplied with electric power.

When the output voltage of the rectifier circuit 2 rises and reaches the above-mentioned first voltage, the transistor 4b constituting the switch control circuit 4 is turned on. When the transistor 4b turns on, the transistor 4d turns off and the switch 5 also turns off. Therefore, no current is supplied to the capacitor 7, the diode 11a, the capacitor 8, the diode 11b, the capacitor 9, and the load 12 connected to the switch 5 (the operating voltage of the transistor is usually about 0.6V).
There, but shall be ignored for the sake of simplicity).
Further, the transistor 13b forming the first power supply detection circuit 13 turns on the resistor 13a as a bias resistor, and turns on the transistors 11h and 11j forming the capacitor connection control circuit 11. Transistor 11
When h is turned on, the capacitor 7 becomes the diode 11d.
-A closed circuit is formed with the transistor 11h, the load 12, and the diode 11d. Therefore, the charging power of the capacitor 7 is supplied to the load. Similarly, the capacitor 8 includes a diode 11e and a transistor 11j.
The load 12 and the diode 11f form a closed circuit, and the charging power of the capacitor 8 is supplied to the load 12. Similarly, the capacitor 9 also supplies charging power to the load 12 via the diode 11g.

As described above, in the present embodiment, by detecting the first voltage, it is detected whether or not the power is being supplied from the output of the rectifier circuit 2 to the load 12, and the capacitors 7-8. 9 is controlled to operate so that the power supply to the load 12 can be maintained.

Next, an embodiment of the third means of the present invention will be described with reference to FIG. Reference numeral 14 is a second power supply detection circuit, which includes resistors 14a, 14b, 14d, transistors 14c, 14e, and a diode 14f. That is, one end of the resistor 14a is connected to the output point D of the diode 6, and the other end is connected to the resistor 14b and the base of the transistor 14c. The other end of the resistor 14b, the emitter of the transistor 14c, and the emitter of the transistor 14e are connected to the B-side terminal of the AC power supply. The collector of the transistor 14c is connected to the collector of the transistor 14e and the resistor 14d, and the other end of the resistor 14d is connected to the positive terminal of the capacitor 9.
The collector of the transistor 14e serves as the output of the second power supply detection circuit, and the capacitor connection control circuit 1
It is connected to the resistors 11i and 11k that form part 1. In addition, the output terminal D of the diode 6 has a capacitor 7
The diode 14f that is connected to is connected to.

The operation of this embodiment will be described below. When the output voltage of the rectifier circuit 2 is between 0 and the first voltage, the switch 5 is short-circuited, and the voltage divided by the resistors 14a and 14b is applied to the base of the transistor 14c. At this time, the transistor 14c operates so that
The values of the resistors 14a and 14b are determined in advance. When the transistor 14c is turned on, its collector has almost the same potential as the emitter, and the transistor 14e is turned off. Therefore, the transistors 11h and 11j connected from the collector of the output transistor 14e via the resistors 11i and 11k are turned off.

When the output voltage of the rectifier circuit 2 rises and exceeds the first voltage, the switch 5 is opened. Therefore, no voltage is present at the output point D of the diode 6, and the transistor 14c is turned off. This makes transistor 1
4e turns the resistor 14d into a bias resistor and turns it on.
Therefore, the transistors 11h and 11j are turned on. The operation of the capacitor connection control circuit 11 according to the output signal of the second power supply detection circuit 14 is the same as that described in the embodiment of the second means.

As described above, according to this embodiment, the power supply is detected depending on the presence or absence of the voltage at the output terminal of the switch 5, and the capacitor connection control circuit 11 is controlled. It is possible to perform continuously from the power source 1 and the capacitors 7, 8 and 9.

Next, an embodiment of the fourth means of the present invention will be described with reference to FIG. Reference numeral 15 is a third power supply detection circuit, which includes resistors 15a, 15b, 15d, 15f.
And transistors 15c, 15e, and 15g. A resistor 15 is placed between the diode 6 and the capacitor 7.
a is inserted, and the emitter and base of the transistor 15c are connected between both terminals thereof via the resistor 15b. The collector of the transistor 15c has a resistor 15d
And the emitter of the transistor 15e are connected. The other end of the resistor 15d and the emitters of the transistors 15e and 15g are connected to the B-side terminal of the AC power supply 1.
The collector of the transistor 15e is connected to the resistor 15f and the base of the transistor 15g. Resistor 1
The other end of 5f is connected to the positive terminal of the capacitor 9. The collector of the transistor 15g serves as the output of the third power supply detection circuit, and is connected to the resistors 11i and 11k forming the capacitor connection control circuit 11.

The operation will be described below. When the output terminal voltage of the rectifier circuit 2 is between 0 and the first voltage, the switch 5 is short-circuited. Therefore, current is supplied from the output point C of the rectifier circuit 2 to the capacitors 7, 8 and 9.
At the same time, a voltage is also generated in the resistor 15a forming the third power supply detection circuit 15, and the transistor 15c is turned on. When the transistor 15c turns on, the resistor 15
A current flows through d, turning on the transistor 15e. When the transistor 15e turns on, the resistor 15f causes the collector of the transistor 15e to have substantially the same potential as the emitter. Therefore, the transistor 15g is turned off. When the transistor 15g is turned off, the transistors 11h and 11j forming the capacitor connection control circuit 11 are turned off.

When the output voltage of the rectifier circuit 2 rises and exceeds the first voltage, the switch 5 is turned off. Therefore, no current flows through the resistor 15a, and the transistor 15c
Is off, transistor 15e is also off, transistor 15
g turns on the resistor 15f as a bias resistor and turns on. This turns on the transistors 11h and 11j.

The operation associated with the change of the AC power supply voltage is the same as that described in the second embodiment of the present invention.

As described above, the present embodiment observes the current flowing through the output of the switch 5 to detect the presence or absence of power supply,
Based on this, operate the capacitor connection control circuit 11,
It is possible to continuously supply power to the load 12 from the AC power supply 1 and the capacitors 7, 8 and 9.

Next, an embodiment of the fifth means of the present invention will be described with reference to FIG. Reference numeral 16 is a fourth power supply detection circuit, which includes resistors 16a, 16f, and a diode 16
It consists of b.16e and transistors 16b and 16c. Between the terminals of the resistor 4e forming the switch control circuit 4, a transistor 16b is provided via a resistor 16f.
The base and emitter of are connected. Transistor 1
The diode 16d is connected to the collector of 6b, and the resistor 16a and the base of the transistor 16c are connected to the other end of the diode 16d. Resistor 16a
The other end of is connected to the output terminal D of the diode 6.
The diode 16e is connected to the emitter of the transistor 16c.
Is connected, and the other end is connected to the B-side terminal of the AC power supply. The collector serves as the output of the fourth power supply detection circuit 16 and is connected to the resistors 11i and 11k that form the capacitor connection control circuit 11.

The operation will be described below. The switch 5 is short-circuited while the output voltage of the rectifier circuit 2 is between 0 and the first voltage. This is turned on by the control signal output from the switch control circuit 4. The control signal is a current that supplies the base bias of the switch 5, and when this current flows, a voltage is generated in the resistor 4e. This voltage turns on the transistor 16b, and a current flows from the collector of the resistor 16a, the diode 16d, and the collector of the transistor 16b to the emitter. Transistor 4d / Transistor 1
Assuming that the collector-emitter voltage of 6b is almost 0, the connection point between the resistor 16a and the diode 16d, that is, the base of the transistor 16c becomes about 0.6V, and the transistor 1
6c is turned off. Here, when the transistor 4e is off, that is, when the output voltage of the rectifier circuit 2 rises and the transistor 4d constituting the switch control circuit 4 is turned off, the diode 16d has its base from the emitter of the transistor constituting the switch 5. Via the resistor 16f
The current is prevented from flowing from the base / collector of the transistor 16b to the base / emitter of the transistor 16c. The diode 16e is for turning off the transistor 16c with respect to the potential at the connection point between the resistor 16a and the diode 16d when the transistor 16b is on. When the transistor 16c is off, the collector of the transistor 16c, which is the output of the fourth power supply detection circuit 16, receives the resistor 11i.
Transistor 11h · 1 connected via 11k
A signal for turning off 1j is output.

When the output voltage of the rectifier circuit 2 rises and exceeds the first voltage, the transistor 4d forming the switch control circuit 4 is turned off and the resistor 4e does not generate a voltage. At this time, the transistor 16b is turned off,
The transistor 16c turns on the resistor 16a and turns it on. When the transistor 16c turns on, the transistor 11 forming the capacitor connection control circuit 11
h · 11j is turned on. The following operation is similar to that of the second embodiment of the present invention.

As described above, in the present embodiment, the fourth power supply detection circuit 16 for detecting whether or not power is supplied by using the switch control signal for turning on / off the switch 5 is used. Then, the capacitor connection control circuit 11
AC power source 1 or condenser 7.8
The power is supplied from 9 to the load 12.

Next, an embodiment of the sixth means of the present invention will be described with reference to FIG. Reference numeral 17 is a fifth power supply detection circuit, which includes a diode 17a and a resistor 17b.17.
d. 17e. 17f and transistors 17c. 17g. The diode 17a and the resistor 17b are connected in series between the input and output terminals of the switch 5, and the emitter of the transistor 17c and the base via the resistor 17d are connected between both terminals of the resistor 17b. . The resistor 17e and the resistor 17f are connected to the collector of the transistor 17c, and the base of the transistor 17g is connected to the other end of the resistor 17f. Resistor 1
The other end of 7e and the emitter of the transistor 17g are connected to the B-side terminal of the AC power supply 1. Transistor 17g
The collector of is the output of the fifth power supply detection circuit 17, and is the resistor 1 that constitutes the capacitor connection control circuit 11.
It is connected to 1i / 11k.

The operation will be described below. When the output voltage of the rectifier circuit 2 is between 0 and the first voltage, the switch 5
Is short-circuited. At this time, the emitter-collector voltage of the transistor of the switch 5 is about 0 V, and therefore no voltage is generated across the resistor 17b of the fifth power supply detection circuit 17. That is, the transistors 17c and 17g are off. At this time, the capacitor connection control circuit 1
The transistors 11h and 11j forming 1 are also off.

When the output voltage of the rectifier circuit 2 rises and exceeds the first voltage, the switch 5 is turned off and a voltage is generated between the emitter and collector of the switch 5. Therefore, the transistor 17c is turned on, the transistor 17g is also turned on, and the transistors 11h and 11j forming the capacitor connection control circuit 11 are also turned on. Hereinafter, the operation of the capacitor connection control circuit is the same as that described in the embodiment of the second means of the present invention.

As described above, in the present embodiment, by detecting the short circuit open of the switch 5 and detecting the presence or absence of power supply, the power is supplied from the AC power source 1 or the capacitors 7, 8 and 9 to the load 12. The supply is controlled.

[0040]

According to the first means of the present invention, the power source can be constituted by an electronic circuit which does not use a transformer, and it is possible to obtain a small-sized power source apparatus which is inexpensive, generates little heat. Further, according to the second, third, fourth, fifth and sixth means of the present invention, it is possible to obtain power supply devices having the same effect with different configurations.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a power supply device of a first means of the present invention.

FIG. 2 is a block diagram showing an embodiment of the second means.

FIG. 3 is a block diagram showing an embodiment of the third means.

FIG. 4 is a block diagram showing an embodiment of the fourth means.

FIG. 5 is a block diagram showing an embodiment of the fifth means.

FIG. 6 is a block diagram showing an embodiment of the sixth means.

FIG. 7 is a block diagram showing a conventional power supply device.

[Explanation of symbols]

 1 AC power supply 2 Rectifier circuit 3 First voltage generation circuit 4 Switch control circuit 5 Switch 7 Capacitor 8 Capacitor 9 Capacitor 10 Power supply detection circuit 11 Capacitor connection control circuit 13 First power supply detection circuit 14 Second power supply detection Circuit 15 Third power supply detection circuit 16 Fourth power supply detection circuit 17 Fifth power supply detection circuit

Claims (6)

[Claims] 1. A power supply to a rectifier circuit connected to an AC power supply, a first voltage generation circuit that generates a first voltage, N capacitors, and N capacitors and a load is turned on / off. Switch, a switch control circuit for controlling the switch so that the switch is turned on when the output voltage of the rectifier circuit is between 0 and the first voltage, and is turned off at other output voltages, a load and a capacitor. A power supply detection circuit that detects the presence or absence of power supply to the power supply, and N capacitors are connected in series when power is supplied, and N capacitors are connected in parallel to the load when power is not supplied. Power supply device with a capacitor connection control circuit. 2. A rectifier circuit connected to an AC power supply, a first voltage generation circuit for generating a first voltage, N capacitors, and power supply to the capacitors and the load is turned on.
A switch for turning off, a switch control circuit for controlling the switch so that the switch is turned on when the output voltage of the rectifier circuit is between 0 and the first voltage, and turned off when the output voltage is other output voltage; Power supply detection circuit that detects the supply of power by detecting the voltage of the power supply, and N capacitors connected in series when power is supplied by the output of the first power supply circuit, and non-power supply A power supply device equipped with a capacitor connection control circuit that controls so that sometimes N capacitors are connected in parallel to a load. 3. A rectifier circuit connected to an AC power source, a first voltage generating circuit for generating a first voltage, N capacitors, and power supply to the capacitors and the load are turned on.
A switch that is turned off, a switch control circuit that controls the switch so that the switch is turned on when the output voltage of the rectifier circuit is between 0 and the first voltage, and is turned off when the output voltage of the rectifier circuit is any other output voltage; A second power supply detection circuit for detecting power supply by detecting an output voltage applied in series to N capacitors generated by short-circuiting and power supply to the load and the capacitor, and a second power supply detection A power supply device provided with a capacitor connection control circuit that controls N capacitors to be connected in series when power is supplied by the output of the circuit and to connect N capacitors in parallel to a load when power is not supplied. 4. A rectifier circuit connected to an AC power supply, a first voltage generation circuit for generating a first voltage, N capacitors, and power supply to the capacitors and the load are turned on.
A switch that is turned off, a switch control circuit that controls the switch so that the switch is turned on when the output voltage of the rectifier circuit is between 0 and the first voltage, and is turned off at other voltages, and a load when the switch is short-circuited. And a third power supply detection circuit that detects the power supply by detecting the current flowing through the capacitor, and the output of the third power supply detection circuit, N capacitors are connected in series when power is supplied, and non-power supply is also performed. A power supply device equipped with a capacitor connection control circuit that controls so that sometimes N capacitors are connected in parallel to a load. 5. A rectifier circuit connected to an AC power supply, a first voltage generation circuit for generating a first voltage, N capacitors, and power supply to the capacitors and the load are turned on.
A switch that is turned off, a switch control circuit that controls the switch so that the switch is turned on when the output voltage of the rectifier circuit is between 0 and the first voltage, and is turned off at other voltages, and a short circuit of the switch A fourth power supply detection circuit that detects power supply by an open control signal and N capacitors connected in series when power is supplied by the output of the fourth power supply detection circuit, and N capacitors when not supplied with power. A power supply device equipped with a capacitor connection control circuit that controls a load to be connected in parallel. 6. A rectifier circuit connected to an AC power supply, a first voltage generation circuit for generating a first voltage, N capacitors, and power supply to the capacitors and the load is turned on.
A switch that is turned off, a switch control circuit that controls the switch so that the switch is turned on when the output voltage of the rectifier circuit is between 0 and the first voltage, and is turned off when the output voltage of the rectifier circuit is any other voltage, and a short circuit of the switch , A fifth power supply detection circuit that detects power supply by detecting opening, and N when power is supplied by the output of the fifth power supply circuit.
A power supply device equipped with a capacitor connection control circuit that controls so that the capacitors are connected in series, and that N capacitors are connected in parallel to the load when non-power is supplied.