JPH0145266Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a rectifier circuit, and particularly to a rectifier circuit suitable for use when obtaining a plurality of rectified outputs.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, as a case of obtaining a plurality of rectified outputs, an arrangement as shown in FIG. 1, for example, has been proposed. That is, in the same figure, a traffic power supply 3 is connected between power supply terminals 1 and 2, and power supply terminal 1 is connected to a connection point between an anode of a diode 5a and a cathode of a diode 5b of a bridge rectifier 5 via a resistor 4. An output terminal 6 is taken out from the connection point between the cathodes of the diodes 5a and 5c, and an output terminal 7 is taken out from the connection point between the anodes of the diodes 5b and 5d. A first rectified output, which is a main output, is obtained between these output terminals 6 and 7.

Further, a series circuit of capacitors 8 and 9 is connected between the output terminals 6 and 7, and the connection point of these capacitors 81 and 9 is connected to the connection point of the anode of the diode 5c and the cathode of the diode 5d of the bridge rectifier 5 via the switch 10. It is also connected to the power supply terminal 1. In addition, in order to obtain the second rectified output which is the sub-output, the current terminal 1 is connected to the resistor 1.
1 through the diode 12 of the bridge rectifier 12
The connection point between the anode of the diode 12a and the cathode of the diode 12b is connected to the output terminal 13, and the connection point of the cathode of the diodes 12a and 12c is connected to the output terminal 13, while the connection point of the anode of the diodes 12b and 12b is connected to the output terminal It is connected. A second rectified output, which is a sub-output, is obtained between these output terminals 13 and 14.

Furthermore, a capacitor 15 is connected between output terminals 13 and 14.
and 16 are connected in series, and the connection point of these capacitors 15 and 16 is connected to the connection point of the anode of the diode 12c and the cathode of the diode 12d of the bridge rectifier 12 via the switch 17, and is also connected to the power supply terminal 2. It is designed so that

The switches 10 and 17 are for switching between bridge rectification and voltage doubler rectification, and are operated in conjunction so that they are turned off during bridge rectification and turned on during voltage doubler rectification.

Now, during bridge commutation, switches 10 and 17
is in the off state, so when the potential of power supply terminal 1 is positive, the current i ₁
However, from the power supply terminal 1, the resistor 4, diode 5a,
The current flows to the power supply terminal 2 via the capacitors 8 and 9 and the diode 5d. On the other hand, when the potential of power supply terminal 1 is negative, the current i ₂
flows from the power supply terminal 2 to the power supply terminal 1 side via the diode 5c, capacitors 8 and 9, diode 5b, and resistor 4. Therefore, the first full-wave rectified output is obtained at the output terminals 6 and 7.
Furthermore, although the current direction is not specifically shown, a current flows in the same manner as described above on the bridge rectifier 12 side for obtaining the second rectified output, resulting in full-wave rectification between the output terminals 13 and 14. A second rectified output is obtained.

On the other hand, during voltage doubler rectification, switches 10 and 17
Since the bridge rectifier 12 is turned on, the bridge rectifier 12 is now turned on.
To explain using the side, when the potential of power supply terminal 1 is positive, current _i3 flows from power supply terminal 1 through resistor 11, diode 12a, capacitor 15, and switch 17 to the power supply terminal as shown by the solid arrow. 2
On the other hand, when the potential of power supply terminal 1 is negative, current _i4 flows to switch 1 as shown by the dashed arrow.
7, flows to the power supply terminal 1 side via the capacitor 16, diode 12b and resistor 11. Therefore,
The output terminals 13 and 14 have a voltage doubler rectified second
rectified output can be obtained. Similarly to the above, a current also flows to the bridge rectifier 5 side for obtaining the first rectified output which is the main output, and therefore the first rectified output which has been voltage doubled and rectified is output between the output terminals 6 and 7. can get.

By the way, in the case of the conventional circuit configured as shown in Fig. 1, the bridge rectifiers 5 and 12 are required to obtain the second rectified output, which is the sub-output, which is electrically the same as the first rectified output, which is the main output. In addition, since switches 10 and 17 are required to switch between bridge rectification and voltage doubler rectification, the structure is complicated and the cost is high.

Purpose of the invention In view of these points, this invention has a simple structure and is the first
The purpose of the present invention is to provide a rectifier circuit that can easily obtain a second rectified output, particularly a voltage doubler rectified output, which is electrically the same as the rectified output of the second rectified output.

Summary of the invention In this invention, the first, second,
A bridge rectifier 25 consisting of third and fourth diodes 25a to 25d is connected, the connection point of the first and second diodes 25a and 25c is connected to the first output terminal 26, and the third and fourth diodes are connected to each other. 25
The connection point of d and 25b is connected to the common output terminal 27 which is a common terminal, and the first and second capacitors 28 and 29 are connected between the first output terminal 26 and the common output terminal 27.
are connected in series, and the first and second capacitors 28, 2
9 is connected to the connection point between the second and third diodes 25c and 25d via the switch 30, and the first power supply terminal 21 is connected to the second output terminal 33 via the fifth diode 31. A third capacitor 3 is connected between the second output terminal 33 and the common output terminal 27.
4 and configured to switch between bridge rectification and voltage doubler rectification by turning on and off the switch 30, a rectification output that is electrically the same as the first rectification output, especially multiple voltage doubler rectification that is the same as the first rectification output. You can get the output.

Embodiment Hereinafter, an embodiment of this invention will be described in detail based on FIGS. 2 to 7.

FIG. 2 shows the circuit configuration of this embodiment. In the figure, an AC power supply 23 is connected to both ends of power supply terminals 21 and 22, and a bridge rectifier 25 is configured by connecting the power supply terminal 21 with a resistor 24. The connection point between the anode of the diode 25a and the cathode of the diode 25b among the diodes 25a to 25d is connected to the connection point of each cathode of the diodes 25a and 25c, and the connection point of each cathode of the diodes 25a and 25c is connected to the output terminal 26. The connection point is connected to the output terminal 27 which is a common terminal. Further, capacitors 28 and 29 are connected in series between the output terminals 26 and 27, and the connection point of these capacitors 28 and 29 is connected via a switch 30 to the connection point of the cathode of the diode 25d and the anode of the diode 25c. Connect to.

Further, the power supply terminal 21 is connected to an output terminal 33 via a diode 31 and a resistor 32, and a capacitor 34 is connected between this output terminal 33 and the common terminal 27. In this embodiment, a first rectified output, which is the main output, is obtained between the output terminal 26 and the common terminal 27, and a second rectified output, which is the auxiliary output, is obtained between the output terminal 33 and the common terminal 27. I'm trying to get the output. Although the first and second rectified outputs are the same in terms of potential due to the above-described configuration, the former is full-wave rectified and the latter is half-wave rectified. It becomes something.

Next, the operation of the circuit shown in FIG. 2 will be explained based on FIGS. 3 to 6.

First, the operation during bridge rectification is shown in Figures 3 and 4.
This will be explained with reference to the figures. During bridge rectification, the switch 30 is turned off. Therefore, the AC voltage supplied from the AC power supply 23 is applied to the power supply terminal 2.
When it is positive (positive half cycle) at 1,
As shown by the solid arrow, the current i ₁ flows through the power supply terminal 21
The current i ₂ flows through the resistor 24, the diode 25a, the capacitors 28, 29, and the diode 25d to the power supply terminal 22, and further flows from the power supply terminal 21 to the diode 31, the resistor 32, the capacitor 34, and as shown by the solid arrow. diode 25d
The current flows to the power supply terminal 22 via. Therefore, the potential relationship at this time is as shown in FIG.
When the potential of the output terminal 26 is +V with respect to the potential of 0V, a rectified output with a potential difference of +V is obtained between both terminals.On the other hand, when the potential of the output terminal 33 is When it is set to +V, a rectified output with a potential difference of +V between both terminals is obtained.

Further, when the potential of the power supply terminal 21 is negative (negative half cycle), the current i ₃ flows from the power supply terminal 22 to the diode 25c, the capacitor 28, the capacitor 29, and the diode 2, as shown by the broken line arrow.
5b and the resistor 24 to the power supply terminal 21. Therefore, the potential relationship at this time is as shown in FIG.
When the potential of the common terminal 27 is -V, a rectified output with a potential difference of +V is obtained between both terminals.On the other hand, the potential of the common terminal 27 is -V with respect to the potential of the output terminal 33 of 0V
When V, a rectified output with a potential difference of +V between both terminals is obtained. As a result, a full-wave rectified first rectified output is obtained between the common terminal 27 and the output terminal 26, and a first rectified output is obtained between the common terminal 27 and the output terminal 3.
3, a second half-wave rectified output is obtained.

Next, the operation during voltage double rectification will be explained with reference to FIGS. 5 and 6. During voltage double rectification, the switch 30 is turned on. Then, power terminal 21
When the potential of is positive (positive half cycle), the current _i1 flows from the power supply terminal 21 to the power supply terminal 22 via the resistor 24, diode 25a, capacitor 28 and switch 30 as shown by the solid line arrow, and the current i1 flows to the power supply terminal 22 as shown by the solid line arrow. As shown by the arrow, current i ₂ is connected to power terminal 2
1 through a diode 31, a resistor 32, capacitors 34 and 29, and a switch 30 to a power supply terminal 2.
It flows to 2. Therefore, the potential relationship in this case is the sixth
As shown in the figure, when the potential of the output terminal 26 is +V with respect to the potential of the common terminal 27 of 0V, a rectified output with a potential difference of +V is obtained between both terminals, while the potential of the common terminal 27 is 0V. Output terminal 3 for
3 is set to +V, a rectified output having a potential difference of +V between both terminals is obtained.

Next, when the potential of the current terminal 21 becomes negative (negative half cycle), the current i ₃ flows from the power supply terminal 22 through the switch 30, the capacitor 29, the diode 25b, and the resistor 24, as shown by the dashed arrow. It flows to terminal 21. Therefore, looking at the potential relationship in this case, as can be seen from FIG. A rectified output, that is, a voltage doubler rectified output, is obtained,
On the other hand, for the potential -V of the common terminal 27, the output terminal 3
The potential of 3 becomes 0V, and there is + between these two terminals.
A rectified output with a potential difference of V is obtained.

Next, when the potential of the power supply terminal 21 is reversed and becomes positive (next positive half cycle), a current flows in the same manner as described above, and the potential relationship at this time is, as can be seen from the right column of FIG. The potential of the output terminal 27 becomes +V with respect to the potential of the output terminal 27 -V, and the potential difference between both terminals becomes +2V. On the other hand, the potential of the common terminal 27 -
The potential of the output terminal 33 becomes +V with respect to V, and the potential difference between both terminals also becomes +2V. That is, for the first time, a rectified output of the doubled voltage is also obtained on the output terminal 33 side. As a result, a first rectified output with doubled voltage is obtained between the output terminal 26 and the common terminal 27, and a second rectified output with doubled voltage is also obtained between the output terminal 33 and the common terminal 27. A rectified output with the same voltage as the rectified output of No. 1 and double the voltage can be obtained. Also in this case, the former is full-wave rectified, and the latter is half-wave rectified.

Incidentally, during this voltage doubler rectification, that is, when the switch 30 is turned on, the diodes 25c and 2 of the bridge rectifier 25, as can be seen from FIG.
It can be seen that 5d is not substantially used. Therefore, if these diodes 25c, 25d and switch 30 are removed and simplified, a circuit as shown in FIG. 7 can be obtained.

That is, in the figure, an AC power supply 23 is connected between power supply terminals 21 and 22, power supply terminal 21 is connected to output terminal 26 through diode 25a, and output terminal 27 is connected to power supply terminal 21 through diode 25b. do. Capacitors 28 and 29 are connected in series between the output terminals 26 and 27, and a connection point between these capacitors 28 and 29 is connected to the power supply terminal 22. Further, the power supply terminal 21 is connected to an output terminal 33 via a diode 31, and a capacitor 34 is connected between this output terminal 33 and the common terminal 27.

The operation in this case is also almost the same as that of the circuit shown in FIG. That is, when the potential of the power supply terminal 21 is positive (positive half cycle), the current i ₁ shown by the solid line flows to the power supply terminal 22 via the diode 25a and the capacitor 28, and the current i ₂ flows through the diode 31, the capacitor 34, and 29. The current flows to the power supply terminal 22 via.

On the other hand, when the potential of the power supply terminal 21 is negative (negative half cycle), the current flows as shown by the dashed arrow.
i ₃ flows from the power supply terminal 22 to the power supply terminal 21 side via the capacitor 29 and the diode 25b.
Therefore, in this case as well, a full-wave rectified first rectified output of the doubled voltage is obtained between the common terminal 27 and the output terminal 26, and a half-wave rectified output is obtained between the common terminal 27 and the output terminal 33. A second rectified output with a doubled voltage is obtained.

Effects of the invention As described above, according to this invention, the first, second, third and fourth diodes 25 are connected to the first and second power supply terminals 21 and 22 to which the AC power supply 23 is connected.
A bridge rectifier 25 consisting of diodes a to 25d is connected, the connection point between the first and second diodes 25a and 25c is connected to the first output terminal 26, and the third and fourth diodes are connected to each other.
The connection point of the diodes 25d and 25b is connected to the common output terminal 27, which is a common terminal, and the first and second capacitors 28 and 29 are connected in series between the first output terminal 26 and the common output terminal 27. The connection point between the first and second capacitors 28 and 29 is connected via the switch 30 to the connection point between the second and third diodes 25c and 25d, and the first power supply terminal 21 is connected via the fifth diode 31. A third capacitor 34 is connected between the second output terminal 33 and the common output terminal 27, and the switch 30 is turned on and off to switch between bridge rectification and voltage doubler rectification. With this configuration, it is possible to obtain a second rectified output as a sub-output having the same potential as the first rectified output as the main output, especially a rectified output with the same multiple voltage multipliers, with fewer components than in the past. This simplifies the configuration and reduces costs.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram showing an example of a conventional circuit, FIG. 2 is a connection diagram showing an embodiment of this invention, and FIGS. 3 and 5 are connection diagrams for explaining the operation of FIG. 2, respectively. 4 and 6 are diagrams for explaining the operations of FIGS. 3 and 5, respectively, and FIG. 7 is a connection diagram showing another embodiment of this invention. 23 is an AC power supply, 25 is a bridge rectifier, 2
6, 33 are output terminals, 27 is a common terminal, 28, 2
9 and 34 are capacitors, 30 is a switch, and 31 is a diode.

Claims (1)

[Scope of utility model registration request] A bridge rectifier consisting of first, second, third, and fourth diodes is connected to the first and second power supply terminals to which the AC power supply is connected, and the connection point of the first and second diodes is connected to the first and second power supply terminals. Connect the connection point of the third and fourth diodes to the common output terminal, which is the common terminal, and connect the first and second capacitors in series between the first output terminal and the common output terminal. The connection point of the first and second capacitors is connected to the connection point of the second and third diodes through a switch, and the first power supply terminal is connected to the second output terminal through a fifth diode. , a third capacitor is connected between the second output terminal and the common output terminal, and switching between bridge rectification and voltage doubler rectification is achieved by turning the switch on and off.