JP3237448B2 - Power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit which is not insulated from a commercial AC power supply used for devices such as a jar, a rice cooker, an iron and a vacuum cleaner.

[0002]

Conventional power supply circuit is configured as shown in FIG. 4 or FIG. 5. FIG. 4 shows a rectifier circuit 1 for rectifying and smoothing a commercial AC power supply and converting it to DC, and a resistor 2.
In this configuration, three loads 28, 29, and 30 are connected in parallel to a power supply unit composed of a capacitor 5, a capacitor 26, and a Zener diode 27. Therefore, the power supply unit needs to supply power to these three parallel loads, and a relatively large current capacity is required. In addition, three loads 28
29 and 30 are actually electronic circuits, and the output voltage across the capacitor 26 is low for electronic circuits. Therefore, the voltage applied to the resistor 25 is large, the power consumption of the resistor 25 is large, and the amount of heat generated is also large.

FIG. 5 shows three loads 31 and 33.
35 is used when each operates at a different voltage. That is, the voltage drop means 32 is connected between the load 31 and the load 33, and the voltage drop means 34 is connected between the load 33 and the load 35. This configuration is also similar to that of FIG. 4 in that three loads 31, 33, and 35 are connected in parallel.

In FIGS. 4 and 5 , the commercial voltage is reduced to an appropriate level by using the resistor 25. However, there is also a device in which a transformer is used in place of the resistor 25. .

[0005]

In the conventional configuration, when converting a commercial voltage to a DC voltage of an appropriate magnitude, a large power load is required for the voltage drop means. However, there is a problem that the size of the device becomes large, heat generation is large, or it is necessary to use a component having a large power rating.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional configuration. When converting a commercial voltage to a direct current, the voltage drop from the commercial voltage is reduced to reduce the loss power. Further, it is a first object of the present invention to provide a power supply device capable of appropriately selecting and arranging a load to be connected, reducing imbalance in current between loads, and reducing power loss. Also, the withstand voltage of the auxiliary power supply of the capacitor to increase the power supply power
A second object is to provide a power supply device whose rating can be reduced . It is a third object of the present invention to provide a power supply device that can use the power supply auxiliary power supply as another independent power supply. It is a fourth object of the present invention to provide a power supply device capable of driving all loads with a capacity lower than the capacity determined by the heaviest load.

[0007]

Means for Solving the Problems A first means of the present invention for achieving the first object, a rectifier circuit and a resistor connected to one end of the commercial AC power source, the other end of the resistor and the commercial AC power source (N + 1) capacitors, first to n-th zener diodes connected in parallel to the first to n-th capacitors, respectively, and first to n-th capacitors from the first and the n th load group connected to each power to the rectifier circuit provided for
When supplied, the (n + 1) th condenser
Is in series with the first through nth capacitors
And when power is not supplied to the rectifier circuit,
The (n + 1) th condenser is the first to nth condenser
Control circuit that controls the capacitor in parallel
And the load group applies the current of any two load groups.
The sum is any one of the remaining (n-2)
The power supply device is set to be larger than the current of the load group .

According to a second aspect of the present invention, there is provided a control circuit comprising: a control circuit;
Is the operating voltage of m Zener diodes smaller than n
And the operating voltage of the (m + 1) Zener diodes
If there is a withstand voltage rating of the capacitor between the sum and
When power is supplied to the rectifier circuit, the (n + 1) th
From the first to the nth capacitor
Power to the rectifier circuit in series with the
When not in parallel with the m Zener diodes
The power supply device is configured to connect the (n + 1) th capacitor .

[0009] A third aspect of the present invention for achieving the third object, a rectifier circuit and a resistor connected to one end of the commercial AC power source, in series between the other end of the resistor and the commercial AC power source (N + 1) capacitors, first to n-th zener diodes connected in parallel to the first to n-th capacitors, respectively, and first to (n)
The first to (n + 1) th loads connected to each of the +1) th capacitors and the (n + 1) th capacitor is connected to the first to nth capacitors when power is supplied to the rectifier circuit. When the power is not supplied to the rectifier circuit, the connection of the (n + 1) th capacitor is connected in series with an arbitrary number of the first to nth capacitors .
It is an arrangement of a power supply device and a control circuit that in parallel with the capacitor over.

[0010] A fourth means of the present invention for achieving the fourth object is a rectifier circuit connected to one end of a commercial AC power supply and a rectifier circuit.
And a resistor between the resistor and the other end of the commercial AC power supply.
The first to (n + 1) th capacitors connected to
And in parallel with the first to n-th capacitors respectively
First to nth Zener diodes connected
And each of the first to (n + 1) th capacitors
The first to (n + 1) th loads connected to the
And the control circuit includes an (n + 1) th load
Is smaller than the current of each of the other n loads
When power is supplied to the rectifier circuit under conditions that take values
The (n + 1) th condenser from the first to the
so as to connect in series to the nth capacitor,
When power is not supplied to the rectifier circuit, the (n + 1) th
Of the first to n-th loads
Of which is connected to the load with the largest load current.
The power supply device is configured to be connected in parallel to the sensor .

[0011]

According to a first means of the present invention, n loads are connected to n capacitors connected in series and n Zener diodes connected in parallel to the respective capacitors,
When power is supplied to the rectifier circuit, the (n + 1) th capacitor is connected in series with the first to nth capacitors, and when power is not supplied to the rectifier circuit, the (n + 1) th capacitor is connected. Is controlled in parallel with the first to n-th capacitors, and the sum of the n load groups is added to the current of any two load groups. The power supply device is arranged so as to be larger than the current of the load group to reduce the current imbalance between the load groups and to function as a power supply device with reduced loss power.

A second means of the present invention resides between the sum of the operating voltages of the m Zener diodes whose breakdown voltage rating of the capacitor is smaller than n and the sum of the operating voltages of the remaining (m + 1) Zener diodes. When power is supplied to the rectifier circuit, the (n + 1) -th capacitor is connected in series with the first to n-th capacitors, and when no power is supplied to the rectifier circuit, m capacitors are connected. The (n + 1) -th capacitor is connected in parallel to the Zener diode described above, thereby acting particularly as a power supply device capable of lowering the withstand voltage rating of the capacitor used as the auxiliary power supply.

[0013] The third means of the present invention is such that the connection of the (n + 1) th capacitor is connected in series with the first to nth capacitors when power is supplied to the rectifier circuit. When power is not supplied to the rectifier circuit, the power consumption is increased by connecting in parallel to an arbitrary number n of the first to n-th capacitors in series. It functions as a power supply device that can constitute a new power supply having a load without itself.

According to a fourth aspect of the present invention, when the power is supplied to the rectifier circuit, the connection of the (n + 1) th capacitor is connected in series with the first to nth capacitors, and the power is supplied to the rectifier circuit. Is not supplied, the (n + 1) th
The second capacitor is connected in parallel with the capacitor to which the heaviest load is connected, acting as a power supply capable of driving all loads with a capacity lower than the capacity determined by the heaviest load. Is what you do.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply according to a first embodiment of the present invention will be described below with reference to FIG. 1 is a commercial AC power supply,
2 is a rectifier circuit, 3 is a resistor, 4 is a first capacitor, 5 is a second capacitor, 6 is a third capacitor, 7 is a first Zener diode, 8 is a second Zener diode, and 9 is a Three zener diodes, 10 is a first load group, 11 is a second load group, 12 is a third load group, 16 is a fourth load group, 17 is a control circuit, and diodes 17a, 17b,
17d, 17e, a resistor 17c, and a transistor 17f. The connection is made at one end 1a of the commercial AC power supply 1.
Is connected to the rectifier circuit 2 and the resistor 3. In this embodiment, the rectifier circuit 2 is a half-wave rectifier circuit with one diode. Between the resistor 3 and the other end 1b of the commercial AC power supply 1, first to third three capacitors 4, 5, 6 connected in series, and a third capacitor, connected in parallel to the three capacitors, respectively. The three first to third three load groups 10.multidot.10 connected to the first to third three Zener diodes 7.8.9 and the three capacitors 7.8.9 respectively. 11 and 12 are connected. The first capacitor 4 and the first Zener diode 7 act as a first stabilized DC power supply for supplying a DC power to the first load group 10, and the second capacitor 5 and the second The Zener diode 8 functions as a second stabilized DC power supply for supplying DC power to the second load group 11. The third capacitor 6 and the third zener diode 9 function as a third stabilized DC power supply for supplying a DC power to the third load group 12. The first load group 10 and the second load group 11
The third load group 12 is constituted by an electronic circuit. Each load group has one or more loads.
It is configured. In this embodiment, from the first
Devise the settings of the third load groups 10 to 12 as follows.
Is what it is. That is, for example, the first load group 10
Of the first load group 10 of the other two load groups 11
・ It is set to be smaller than the total current of 12.
You. Further, the second load group 11 is
The total current is higher than the total current of the other two load groups 10 and 12.
Is also a small setting. That is, in this embodiment
The load group setting at the point where the current of any two load groups is added
However, if the sum is negative for any one of the remaining (n-2)
It is designed to be larger than the current of the load group.
You. Each load group is set so that this relationship holds.
To set the current consumption of the load groups 10 to 12
Load group with small difference and small imbalance
It is the setting of. Further exchange with the third capacitor 6
Between the other end 1b of the power supply 1 and the fourth capacitor 16
When, a control circuit 17 for controlling the fourth capacitor 16
Connected. In this embodiment, n is set to 3.
is there. Reference numeral 16 denotes this fourth condenser. System
The control circuit 17 connects the diode 17a to the third capacitor 6
And the fourth capacitor 16 and a diode 17
e is the other end of the fourth capacitor 16 and the end of the commercial AC power supply 1
Between the resistor 17c and the diode 17b.
d is the output terminal of the resistor 3 and the terminal 1b of the commercial AC power supply 1
Are connected in series. Diode 17b is a resistor
3 and the base of the transistor 17f are resistors
The emitter is located at the connection point between the diode 17c and the diode 17d.
The connection point between the capacitor 16 and the diode 17e of co
Is connected between the third capacitor 6 and the diode 17a.
Connected to a point. In this embodiment, the rectifier circuit 2
The resistor 3 is connected to three sets of DC stabilized power supply configured respectively condenser 4-6 Zener diode 7-9 has a configuration of connecting the load group 10 to 12 to each of the DC stabilized power supply, It is also possible to adopt a configuration in which n load groups are connected to n DC stabilized power supplies.

The operation of this embodiment will be described below. When the terminal 1a side of the commercial AC power supply 1 becomes a positive polarity, a first current determined by the resistance value of the resistor 3 are connected in series, the second, diode from the third condenser 4, 5, 6 17
a, flows through the fourth capacitor 16 and the diode 17e
You. At this time, the resistor 17c and the diode 17d are connected simultaneously.
Current flows through the diode 17d and the diode
A voltage of about 0.6 V is generated between the node 17e and the transistor 1
The voltage between the base and emitter of 7f becomes 0 and the transistor
The switch 17f is turned off . At the same time, current is also supplied to the first, second, and third zener diodes 7, 8, and 9, and the first, second, and third load groups 10, 11, and 12. This first and second
The voltages of the second and third capacitors 4 to 6 are
Zener diode 7 and second Zener diode 8
・ Stabilized by the third Zener diode 9
You. The capacitor 16 is the first to third capacitors.
At this time, the resistor 3
The burdened voltage is relatively small. In other words,
Compared to a configuration in which the existing loads are connected in parallel.
The voltage drop from the voltage should be small
Can be. The current flowing through the resistor 3 varies from the first to the third.
The current used by the largest load among the load groups 10 to 12
Although the current is determined, the load current
Since the load connection is used to reduce the balance , the resistor
The current flowing through 3 becomes smaller . Therefore, the resistance
The capacity of the container 3 is small and the power consumption is small.
Therefore, the temperature rise is also low. Therefore, the power of this embodiment is
The source device can be a small device with low power loss.
It can be. When the terminal 1a side of the commercial AC power supply 1 becomes negative, power supply from the commercial AC power supply 1 is stopped, and during this time, the first load group 10, the second load group 11, and the third load group 12 Current is supplied from one capacitor 4, second capacitor 5, and third capacitor 6. At the same time, the diode 17d
No current flows through e. At this time, the transistor 17
f is a diode using the fourth capacitor 16 as a power source.
Turn on the resistor 17c from 17b with the bias resistor
Things. When the transistor 17f is turned on, the fourth
Capacitor 16 is equivalently connected via a diode 17b.
First to third capacitors 4 to 6 connected in series
Are connected in parallel. That is, the fourth
At this time, the condenser 16 is connected to the first load group 10
Respect of the load group 11, a third load group 12, first from a first
Supply power to the load together with the three capacitors 4, 5, 6
And the fourth capacitor 16 is the first to third capacitors.
The power supply by the capacitor is increased .

As described above, according to the present embodiment, the fourth core
When the rectifier circuit is energized, the
Because the series-connected capacitor 4,5,6 and resistor 3
The applied voltage decreases by the voltage of the capacitor 16.
You . The voltage of the capacitor 16 is the first to third capacitors
Since the connection is made in parallel with 4, 5, and 6 , the first to third
It becomes equal to the sum voltage of the capacitor . Therefore, the resistor 3 has an AC
Current voltage and twice the sum voltage of the first to third capacitors
The subtracted voltage is applied . Also, load the capacitor 16
If, subjected from the first from both the third capacitor 4,5,6
To be fed, the current flowing to the resistor 3 is set to less current
Can be . Therefore to reduce power consumption of the resistor 3, and
To reduce the power consumption of the resistor 3 that causes power loss
More, it is a loss less power-efficient power supply
Can be done .

[0018] For Then power supply is a second embodiment of the present invention will be described with reference to FIG. Reference numeral 18 denotes a second control circuit, which includes a diode 18a and a diode 18a.
b, diode 18d, diode 18e, transistor 18f and resistor 18c. The connection is the same as that of the first embodiment, except that the connection of the terminal of the resistor 18c opposite to the connection point with the diode 18d is connected to the connection point of the first capacitor 4 and the second capacitor 5. Is different from the first embodiment.

The operation of this embodiment will be described below. When the terminal 1a side of the commercial AC power supply 1 has a positive polarity, the current flowing through the resistor 3 is equal to the first, second, and third capacitors 4.
5.6 to diode 18a, fourth capacitor 1
6. Flow through the diode 18e. At this time, the resistor 18c
The current through the diode 18d from the voltage of approximately 0.6V is generated between the diode 18d, diode 18e, voltage zero transistor 18f between the base and emitter of the the transistor 18f is turned off. When the terminal 1a becomes negative polarity is inverted the polarity of the commercial AC power supply 1, no current flows to the diode 18 d · diode 18e. At this time, in this embodiment, the transistor 18f operates using the fourth capacitor 16 as a power supply. That is, from the diode 18b, the resistance 18
The base-emitter is turned on using c as a bias resistor. When the transistor 18f is turned on, the fourth capacitor 16 is connected in parallel to the second capacitor 5 and the third capacitor 6 equivalently connected in series via the diode 18b. That is, in this embodiment, the voltage rating of the fourth capacitor is lower than the sum of the operating voltages of the first to third three Zener diodes 7 to 9, and the second and third two Zener diodes 8
・ This is for the case where the operating voltage is higher than the operating voltage of 9.
That is, since the fourth capacitor 16 used in the first and third embodiments is connected in parallel to the first to third zener diodes 7 to 9 connected in series, the fourth capacitor 16 has a withstand voltage. The rating is limited to those that are equal to or higher than the operating voltages of the first to third Zener diodes 7 to 9. In this respect, according to this embodiment, an effect close to that of the first embodiment can be obtained while using a capacitor having a low withstand voltage rating. According to the present embodiment, the fourth capacitor 16 serves to reduce the power loss of the resistor 3 and to increase the power supply of the second load 11 and the third load 12.

As described above, in this embodiment, m smaller than n
Of the operating voltages of the zener diodes and the remaining (m +
1) When there is a withstand voltage rating of a capacitor used as an auxiliary power supply between the sum of the operating voltages of the zener diodes and the (n + 1) th capacitor when power is supplied to the rectifier circuit 2, such that the series with the n-th capacitors from scratch, also as when power to the rectifier circuit 2 is not supplied to connect the (n + 1) -th condenser parallel to the m Zener diode, the An object of the present invention is to realize a power supply device capable of lowering the withstand voltage rating of a capacitor used as an auxiliary power supply while increasing power supply power .

[0021] Next, the power supply device of the third embodiment of the present invention will be described with reference to FIG. In this embodiment, a fourth load 20 is connected to both ends of the fourth capacitor 16. Further, a third control circuit 19 for controlling the connection of the fourth capacitor 16 is used. The third control circuit 19 includes a diode 19a, a diode 19b, a diode 19d, a diode 19e, and a transistor 19f.
And a resistor 19c. In the present embodiment, the third control circuit is the same as the second control circuit of the second embodiment in connection, and has a fourth load 19, so that the number assigned is changed.

The operation of the embodiment will be described below. While one end 1a of the commercial AC power supply 1 has a positive polarity, the current flowing through the resistor 3 flows from the first, second, and third capacitors 4, 5, and 6 to the diode 19a, the fourth capacitor 16, and the diode 19e. . That is, the fourth capacitor 16 is charged by this current, and supplies power to the fourth load 20 as well. When the terminal 1a of the commercial AC power supply 1 has a negative polarity, the fourth capacitor 16 is connected in parallel to the second capacitor 5 and the third capacitor 6 equivalently connected in series via the diode 19b. . That is, in this state, the fourth capacitor 16 functions as an auxiliary power supply for supplying power to the second load 11 and the third load 12. In other words, the fourth capacitor 16 reduces the power loss of the resistor 3 and also acts as an independent power source for the fourth load 20, and also increases the power for the second load 11 and the third load 12. It also works as

As described above, according to the present embodiment, it is possible to realize a power supply device in which the fourth capacitor 16 can be used as a power supply power supply or as a separate power supply.

At this time, in the present embodiment, the fourth capacitor 16 is connected in parallel to the second capacitor 5 and the third capacitor 6 connected in series. 6 can be freely connected in parallel.
That is, as long as the fourth capacitor 16 used is within the range of the withstand voltage rating, it can function as an auxiliary power source for increasing power to any load. In particular, for example, when the third load 12 is the heaviest load, if the connection of the fourth capacitor is connected in parallel only to the third capacitor 6, the fourth capacitor 16 will be the heaviest. The power supply can be used as an auxiliary power supply for power supply to the load 12. Of course, at this time, the fourth load 20 can be used as a power supply for power enhancement without connecting the load.

With the above configuration, it is possible to make the power supply device capable of driving all loads by setting the capacity of the power supply device to be lower than the capacity determined by the heaviest load. .

[0026]

First means of the present invention exhibits a rectifier circuit and a resistor connected to <br/> end of the commercial AC power source, connected in series between the other end of the resistor and the commercial AC power source, (n + 1) and the pieces of the capacitor, and the n-th Zener diode from a first connected in parallel from the first to the n-th capacitors, the Re respectively <br/> of the n-th capacitor from the first The connected first to nth load groups and the rectifier circuit
When power is supplied, the (n + 1) th
Densers are connected directly to the first to nth capacitors.
If the power is not supplied to the rectifier circuit so that
The (n + 1) th condenser is
Control so that it is parallel to the nth capacitor .
Control circuit, and the load group includes any two load groups.
Even if the currents are added, the sum is the sum of the remaining (n-2)
A configuration that is set to be larger than the current of any one load group;
When creating a DC power supply from commercial AC voltage,
Loss power of resistor by reducing voltage drop from commercial voltage
Reduce, and realizes a high efficiency power supply.

According to a second aspect of the present invention, a control circuit includes an n-type control circuit.
The sum of the operating voltages of m Zener diodes
With the sum of the operating voltages of the (m + 1) Zener diodes
If there is a withstand voltage rating of the capacitor between
When power is supplied to the road, the (n + 1) th
Densers for the 1st to nth capacitors
No power is supplied to the rectifier circuit so that it is in series
Sometimes (n) is connected in parallel with the m Zener diodes.
+1) The configuration to connect the capacitor
Lower the withstand voltage rating of the auxiliary power supply of the capacitor for power enhancement.
This realizes a power supply device that can be used. Third means of the present invention, a rectifier circuit and a resistor connected to one end of the commercial AC power source, connected in series between the other end of the resistor and the commercial AC power source, and (n + 1) number of capacitors, the from a first connected from scratch in parallel to the n-th capacitor and the n-th zener diode, first from the first (n
The (n + 1) -th load connected to each of the ( +1) -th capacitors and the (n + 1) -th capacitor is connected to the first to n-th capacitors when power is supplied to the rectifier circuit. When the power is not supplied to the rectifier circuit, the connection of the (n + 1) th capacitor is connected in series with an arbitrary number of the first to nth capacitors .
As a configuration including a control circuit in parallel with a capacitor, a power supply device capable of using an auxiliary power source for power enhancement as another independent power source is realized.

According to a fourth aspect of the present invention, there is provided a commercial AC power supply.
A rectifier circuit and a resistor connected to
From the first to (n) connected in series with the other end of the
+1) th condenser and the 1st to nth condensers
The n-th from the first which is connected in parallel to Densa or
Zener diode in the first to (n + 1) th
From the first to the (n +
1) a load, and a control circuit, wherein the control circuit
The current of the (n + 1) th load is that of the other n loads
Under conditions that take values smaller than the respective currents,
When power is supplied to the road, the (n + 1) th
Capacitor for the 1st to nth capacitors
No power is supplied to the rectifier circuit as if connected in series
When the (n + 1) th condenser is
Load with the largest load current among the loads from the nth load to the nth load
Connected in parallel to the capacitor to which is connected
As a configuration, the capacity is lower than the capacity determined by the heaviest load.
It is intended to realize a power supply device capable of driving all loads by the amount .

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a power supply device according to a second embodiment;

FIG. 3 is a block diagram showing a power supply device according to a third embodiment;

FIG. 4 is a block diagram showing a conventional power supply device.

FIG. 5 is a block diagram showing another conventional power supply device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Commercial AC power supply 2 Rectifier circuit 3 Resistor 4.5.6 Capacitor 7.8.9 Zener diode 10.11.12 Load group 16 Fourth capacitor 17 Control circuit 18 Second control circuit 19 Third control circuit 20 Fourth load

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-253540 (JP, A) JP-A-6-165496 (JP, A) JP-A-5-244772 (JP, A) 97486 (JP, U) Japanese Utility Model Showa 61-138337 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02M 7/06 H02M 7/08

Claims (4)

(57) [Claims] And 1. A commercial AC rectifier circuit and a resistor connected to one end of the power, connected in series between the other end of the resistor and the commercial AC power source, and (n + 1) number of capacitors, first
Connected in parallel to the nth capacitor from
A first n-th Zener diode from the first, second from the first
The first to the first connected to each of the nth capacitors
When power is supplied to the nth load group and the rectifier circuit
Means that the (n + 1) th condenser is from the first to the nth condenser
So that it is in series with the
When power is not supplied to the flow circuit, the (n + 1) th
The eye condenser becomes the first to nth condenser
And a control circuit for controlling so as to be in parallel with the
The load group is the sum of the currents of any two load groups.
The current of any one of the remaining (n-2) load groups
A power supply with a larger setting . 2. A control circuit comprising : m Zeners smaller than n;
-Sum of operating voltage of diode and (m + 1) Zeners
The withstand voltage of the capacitor between the sum of the operating voltage of the diode
When power is supplied to the rectifier circuit when a rating exists.
The (n + 1) th condenser from the first to the
to be in series with the nth capacitor,
When power is not supplied to the rectifier circuit, the m
(N + 1) th capacitor in parallel with the
The power supply according to claim 1, wherein the power supply is connected . 3. A rectifier circuit is connected to one end of the commercial AC power source and the resistor, connected in series between the other end of the resistor and the commercial AC power source, (n + 1) and the number of the condenser, the n from the first The first to nth Zener diodes connected in parallel to the
The first to (n + 1) th loads connected to each of the (n + 1) th capacitors and the (n + 1) th capacitor is connected to the first to nth capacitors when power is supplied to the rectifier circuit. as the series for, also when power to the rectifier circuit is not supplied the (n + 1) th connection of the capacitor and any number of the series connection of one of the n-th capacitor from the first
And a control circuit in parallel with the capacitor . 4. A rectifier circuit connected to one end of a commercial AC power supply.
And a resistor, between the resistor and the other end of the commercial AC power supply.
1st to (n + 1) th capacitors connected in series
And the first through n-th capacitors, respectively.
The first to nth zener diodes connected to the column
And that of the first to (n + 1) th capacitors
The first to (n + 1) th loads connected to each
And a control circuit, wherein the control circuit is the (n + 1) th negative
The load current is smaller than the current of each of the other n loads
Power is supplied to the rectifier circuit under conditions that take
Sometimes, the (n + 1) th condenser from the first
Connect in series with the nth capacitor
When power is not supplied to the rectifier circuit, the (n +
1) The first condenser is connected to the first to n-th condensers.
The load with the largest load current among the loads is connected
Power supply connected in parallel to the capacitor .