JPH02303360A - Power source - Google Patents

Abstract

PURPOSE:To proceed standardization and to reduce power loss by holding a predetermined relationship between an output voltage and a reference voltage from a voltage generator by regulating the impedance of an impedance circuit if the predetermined relationship therebetween is varied due to decrease in the voltage. CONSTITUTION:A control circuit 3 operates in such a manner that the impedance of an impedance circuit 9 becomes small by varying the switching frequency of noncontact switching elements 5a-8a if an output voltage is, for example, lowered thereby to raise the voltage output via an impedance circuit 22, thereby holding predetermined relationship between the output voltage and a reference voltage.

Description

[Detailed Description of the Invention] [Object of the Invention] ′ (Field of Industrial Application) The present invention is directed to a power supply device for supplying a constant voltage to a load, and in particular, a power supply device that can be applied to loads having different rated input terminals. related to power supplies.

(Prior art) For example, in a DC power supply device, the rated input terminal is relatively large (when driving different DC motors, conventionally,
Each rated input voltage (e.g. 12v.

Although a dedicated stabilized power supply device is prepared for each voltage (24V), there is a serious problem in that this greatly hinders the standardization of stabilized power supply devices. In order to cope with such problems, conventionally, a so-called series regulator type power supply device has been used. That is, this device is suitable for cases where high voltage accuracy is required, and a power transistor is interposed in the current path between the DC power source and the DC motor, and the base bias voltage of this power transistor is controlled by feedstock control. Thus, the output voltage can be adjusted and stabilized.

(Problem to be Solved by the Invention) The series regulator type DC power supply device described above has the advantage of high output voltage accuracy, as well as the advantage of a simple structure and no noise generation. , the situation is that all unnecessary power in the power transistor is dissipated as heat. Therefore, not only does the power loss become large due to the heat loss, but also a large-area radiator is required for heat radiation, leading to the problem that the entire device becomes a doll. Furthermore, since the process of assembling the heat radiator is relatively troublesome, there is also the problem that the manufacturing cost increases due to the increase in assembly man-hours.

The present invention has been made in view of the above circumstances, and its purpose is to promote standardization and significantly reduce power loss, as well as to achieve effects such as reducing overall size and manufacturing costs. There is a power supply provided.

[Structure of the invention]

(Means for Solving the Problems) A power supply device according to the present invention includes a pair of first and second energizing paths for energizing a load, a single-phase full-wave rectifier circuit configured in a diode bridge type, and a diode bridge type an auxiliary single-phase full-wave rectifier circuit configured to have a pair of DC output terminals connected to the first and second energizing paths, respectively; a first AC power terminal connected to one AC input terminal of the phase full-wave rectifier circuit; a second AC power terminal connected to the other AC input terminal of the auxiliary single-phase full-wave rectifier circuit; Non-contact switching elements are connected as a single-phase rectifier bridge circuit, and a pair of terminals corresponding to the DC output terminals of the single-phase rectifier bridge circuit are respectively connected to a pair of DC input terminals of the 11i-phase full-wave rectifier circuit. a switching circuit, an impedance circuit consisting of a reactance element connected between a pair of terminals corresponding to the AC input terminals of the single-phase rectifier bridge circuit constituting this switching circuit, and a voltage generation circuit that generates a constant reference voltage, respectively. In addition, the impedance can be adjusted by controlling the switching frequency of the non-contact switching element and changing the frequency of the AC voltage applied to the impedance circuit, and by such impedance adjustment, the reference voltage and the impedance circuit can be adjusted. The structure includes a control circuit that controls the voltage outputted through the oscillator so that it has a certain relationship with the voltage output through the oscilloscope.

Furthermore, after removing the auxiliary single-phase full-wave rectifier circuit from the above configuration, the first AC power supply terminal is connected to the first energizing path via a pair of AC input terminals of the single-phase full-wave rectifier circuit. In addition, the second AC power supply terminal may be connected to the second current supply path.

(Function) When the switching frequency of the non-contact switching element in the switching circuit is changed to change the frequency of the AC voltage applied to the reactance element constituting the impedance circuit, the impedance of the impedance circuit will change. Become. Specifically, if the reactance element is capacitive, the impedance decreases as the frequency of the alternating current voltage applied to it increases, and if the reactance element is inductive, the impedance decreases as the frequency of the AC voltage applied to it increases. It increases as the frequency of the alternating current voltage applied to it increases.

On the other hand, for the negative phase, a single-phase full-wave rectifier circuit and a switching circuit are connected to the first and second AC power supply terminals.

Power is supplied via an impedance circuit and an auxiliary single-phase full-wave rectifier circuit. Specifically, when an AC voltage with a positive potential on the first AC power terminal side is applied between both AC power terminals, the single-phase full-wave rectifier circuit, the switching circuit, the impedance circuit, and the above-mentioned ++t + Energize through the base wave rectifier circuit, the auxiliary ill-phase full-wave rectifier circuit, the first energizing path, the load, the second energizing path, and the path leading to the second power supply terminal via the auxiliary single-phase full-wave rectifier circuit. be done. Also,
When an AC voltage with a positive potential on the second AC power supply terminal side is applied between both AC power supply terminals, the circuit is connected from the second power supply terminal to the auxiliary single-phase full-wave rectifier circuit, the first conduction path, the load, and the second conduction path. An electric path a is formed which leads to the first power supply terminal via the electric path, the auxiliary single-phase full-wave rectifier circuit, the single-phase full-wave rectifier circuit, the switching circuit, the impedance circuit, and the single-phase full-wave rectifier circuit. In other words, even when an AC voltage is applied between the first and second AC power supply terminals, the load is always supplied with a DC current flowing from the first current-carrying path side to the second current-carrying path side. It is.

However, if the voltage output through the switching circuit, impedance circuit, etc. decreases as described above, and the constant relationship between the output voltage and the reference voltage of the voltage generator circuit 1 changes, then , the control circuit controls the above-mentioned constant relational force (to be maintained) by adjusting the impedance of the impedance circuit. Specifically, the control circuit controls the above-mentioned constant relational force (to be maintained) by adjusting the impedance of the impedance circuit. By changing the switching frequency of the non-contact switching element, the impedance of the impedance circuit is controlled to be small, thereby increasing the voltage output through the impedance circuit, thereby maintaining the constant between the output voltage and the reference voltage as described above. Contrary to the above, when the output voltage of the impedance circuit increases, the control circuit changes the switching frequency of the non-contact switching element to increase the output voltage of the impedance circuit. The impedance is controlled to be large, thereby lowering the output voltage through the impedance circuit, so that a constant relationship between the output voltage and the reference voltage is maintained.

Due to the above-described effects, the output voltage of the impedance circuit, that is, the voltage applied to the DC load, is made constant, and at this time, only reactive power is consumed by the capacitor in the impedance circuit. Furthermore, the level of the output voltage can be changed by selecting a reference voltage from the voltage generation circuit.

On the other hand, if the configuration is such that the auxiliary single-phase full-wave rectifier circuit is removed, the rectifying action by the auxiliary single-phase full-wave rectifier circuit disappears, and as a result, there is a gap between the first and second AC power supply terminals. When an AC voltage is applied, the first
An alternating current whose current direction is alternately switched is supplied through the second energizing path and the second energizing path.

(Example) Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 1 denotes a load, such as a three-phase night current brushless motor, which has a pair of first energizing paths 2a and a second energizing path.
from the energizing path 2b to the output terminal Q3 of the control circuit 3, which will be described later.
It is provided to be supplied with power through Qs. 4 is a single-phase AC power supply, and a first AC power supply terminal 4a is connected to both ends of the AC power supply.
and a second AC power supply terminal 4b are connected. At this time,
The first AC power supply terminal 4a is connected to a forward biased rectifying diode 5. It is connected to the second current-carrying path 2b via a resistor 6.7 and a constant voltage diode 8 in a reverse bias state. Further, an auxiliary fB current path 2C is connected to the common connection point of the resistor 6.7, and a lower dipping capacitor 9 is connected between this auxiliary current path 2C and the second current path 2b. . At this time, the second energizing path 2b is connected to the second AC power supply terminal 4b through a diode 10a in an auxiliary single-phase full-wave rectifier circuit 10, which will be described later, in the forward direction. Therefore, a DC voltage that has been rectified and smoothed the output of the AC power source 4 and stabilized by the constant voltage diode 8 is applied to the auxiliary current path 2C.

11 is a voltage generating circuit, and by connecting a variable resistor 11g in parallel with the constant voltage diode 8, in 1,
This is the sliding terminal of the variable resistor 11a, and its reference voltage Vs is applied to the input terminal P4 of the control circuit 3. Further, 12 is a voltage detection circuit, which is constructed by connecting voltage dividing resistors 13 and 14 in series between the first and second energizing paths 2a and 2b. Therefore, the resistors 13 and 14 which are the output terminals of the voltage detection circuit 12
From the common connection point, the first and second energizing paths 2a and 2
During the period b, a detection voltage Vd corresponding to the voltage V ouL output as described later is output, and the detection voltage Vd is applied to the input terminal P5 of the control circuit 3. Furthermore, 1
Reference numeral 5 denotes a smoothing capacitor connected between the first and second current-carrying paths 2a and 2b, and the smoothing effect of this capacitor stabilizes the output voltage V ouL.

The auxiliary single-phase full-wave rectifier circuit 10 includes four diodes 10.
It is configured by connecting a to 10d in a bridge, and its (
The +) side DC output terminal T-Ta is connected to the first energizing path 2a, and the (-) side DC output terminal Tb is connected to the second energizing path 2b. Further, the auxiliary single-phase full-wave rectifier circuit 10 has one AC input terminal Tc connected to the second AC power supply 4.
b, and the other AC input terminal Td is connected to one AC input terminal Te of the single-phase full-wave rectifier circuit 16.

This single-phase full-wave rectifier circuit 16 includes four diodes 16a.
16d are bridge-connected, and the other AC input terminal Tf is connected to the first AC power supply terminal 4a.

Reference numeral 17 denotes a switching circuit, which includes four non-contact switching elements, such as phototransistors 18a to 21a.
are connected as a single-phase rectifier bridge circuit as shown in the figure, and a pair of terminals T1 and Tt corresponding to the DC input terminals of the single-phase rectifier bridge circuit are connected to the (+) ) side DC output terminal Tg and (-) side DC output terminal Th, respectively.

22 is an impedance circuit, in which a non-polar electrolytic aluminum type capacitor 22a, which is a reactance element, is connected between a pair of terminals T3 and 14 corresponding to the AC output terminals of the single-phase rectifier bridge circuit constituting the switching circuit 17. It is made up of.

The phototransistors 18a to 21a are connected to four pairs of photocouplers 18 to 21 together with light emitting diodes 18b to 21b, respectively.
It constitutes. These light emitting diodes 18b~
Of 21b, the light emitting diodes 18b and 19b are connected to be energized simultaneously from the auxiliary energizing path 2C via the resistor 23 and the first transistor 24, and the light emitting diodes 20b and 21b are connected to the auxiliary energizing path 2C through the resistor 23 and the first transistor 24. They are connected through the resistor 23 and the second transistor 25 so that they are energized at the same time. Therefore, when the first transistor 24 is turned on, the light emitting diode 18b
,, 19b is energized and turned on, and the phototransistor 13a,
When the transistor 19a is turned on and the second transistor 25 is turned on, the light emitting diodes 20b and 21b are energized and the phototransistors 2Qa and 21a are turned on. In this case, the first and second transistors 24 and 25 are turned on by pulsed ON command signals S1 and S2 output from the output terminals Q1 and Q2 of the control circuit 3, respectively. ing.

The control circuit 3 has an auxiliary energizing path 2C and a second energizing path 2b between the control power terminal P3 and the common power terminal 22.
It is configured to receive the output between the two, thereby obtaining its own power source. The control circuit 3 also connects a first
It is configured to receive the output between the energizing path 2a and the second energizing path 2b, thereby obtaining a power source for driving the brushless motor 1. The control circuit 3 includes, for example, a microcomputer, and controls the rotation of the brushless motor 1 based on a control program stored in advance. A DC voltage, which will be described later, is applied between the load power supply terminal Pl and the common power supply terminal 22 to the stator coil 1 (not shown).

Now, in addition to controlling the brushless motor 1 as described above, the control circuit 3 also controls the first and second transistors 24.
and 25, which in turn controls the switching circuit 17 and the impedance circuit 22, and the details of the control will be explained below along with the overall operation.

First, the functions of the switching circuit 17 and the impedance circuit 22 will be explained.

That is, when the phototransistors 18a and 19a are turned on and one phototransistor 20a and 21a is turned off, the following current path is formed. In other words, during a period in which an AC voltage with a positive potential on the side of the first AC power supply terminal 4a is output from the AC power supply 4, the diode 16b of the single-phase full-wave rectifier circuit 16 and the phototransistor 18a are output from the first AC power supply terminal 4a. , capacitor 22a, phototransistor 19
a.

Diode 16c of the single-phase full-wave rectifier circuit 16, diode 10d of the auxiliary single-phase full-wave rectifier circuit 10, and first energizing path 2a
, control! 11 circuits 3. Brushless smoke 1° control circuit 3.
A current-carrying path is formed which reaches the second power supply terminal 4b via the second;a electric path 2b and the diode 10g of the auxiliary single-phase full-wave rectifier circuit 10. In addition, during the period when the AC power supply 4 outputs the +E positive potential AC voltage on the second AC power supply terminal 4b side,
From the second AC power supply terminal 4b, the diode iob, ii
energizing path 2a, control circuit 3. Brushless motor 1. $1
grJ circuit 3. Second energizing path 2b, diode tic.

Diode 16d, phototransistor 18a, capacitor 22a, phototransistor 19a, diode 16a
A current-carrying path is formed which reaches the first power supply terminal 4a via the first power supply terminal 4a. As a result of the above, a current flows in the capacitor 22a in the direction indicated by the arrow in the figure.

On the other hand, contrary to the above case, the phototransistor 13a,
19a is turned off and phototransistors 20a, 21a
When turned on, the following current path is formed. That is, during a period in which an AC voltage with a positive potential on the first AC power supply terminal TAa side of the AC power supply 4 is output, the diode 16b, the phototransistor 2a, the capacitor 22a, and the phototransistor are connected from the first AC power supply terminal 4a. 21a
.

Diode 16c, diode 10d, first energizing path 2
a. Control circuit 3. Brushless motor 1. Control circuit 3. A current-carrying path is formed which leads to the second power supply terminal 4b via the second;lfJ electric path 2b and the diode 10g. Also,
During a period in which the AC power supply 4 outputs an AC voltage with a positive potential on the second AC power supply terminal 4b side, the second AC power supply terminal 4b
, a diode]Ob, a first current-carrying path 2g, a control circuit 3. Brushless Morph 1. Control circuit 3. Second energizing path 2
b, diode 10c, diode 16d, phototransistor 20a, capacitor 22a, phototransistor 2
1a, the first power supply terminal 4a via the diode 16a
A current-carrying path is formed. As a result of the above, capacitor 2
A current flows through 2a in the direction of arrow A in the figure.

In other words, although a direct current flows between the first and second current paths 2a and 2b, an alternating current voltage is applied to the capacitor 22a, and therefore the impedance circuit 2
2 end TT3. The impedance Z between Ta changes depending on the frequency of the AC voltage. Further, the impedance 2 can be changed in size within a predetermined range by changing the switching frequency of the switching path 17, that is, the switching frequency of the group of phototransistors 18a and 19a and the group of phototransistors 20a and 21a.

, so that the switching frequency is the same as the first and second switching frequencies.
The control circuit 3 is configured to be able to adjust the impedance Z of the impedance circuit 22 by controlling the on-off periods of the transistors 24 and 25.

That is, the control circuit 3 is, for example, as shown in FIG. 4(b).

As shown in (c), an on-command signal S1 of a predetermined period is output from an output terminal Q1, and an on-command signal S2 having an opposite phase to the on-command signal S1 is output from an output terminal Q2. The output frequency of each of these signals S1 and S2 is changed as described later. And now, output terminal Q1. Q2 to Figure 4 (b) and (
c)+: When the ON command signals S1 and S2 as shown are output, the first and second transistors 24 and 2
5 is one that is turned on alternately at a predetermined period. Therefore, the terminal T of the switch jig circuit 17.

From 16 onwards, a DC voltage as shown by the solid line in FIG. 4(a) is periodically output during the period when the on-command signal S1 is output, and the A DC voltage as shown by the broken line in Figure (a) is periodically output.

In such a state, the impedance circuit 22
The voltage Vout output through (that is, the voltage given to the brushless morph 1 through the control circuit 3) is
For example, the level is as shown in (d) in FIG. 4, and the level of the output voltage v out changes depending on the impedance Z of the impedance circuit 22.

Further, the control circuit 3 actively adjusts the impedance as described above so that the detected voltage Vd and the reference voltage Vs match (in other words, the output voltage VouL through the impedance circuit 22 and the reference voltage Vs The configuration is such that the control is performed so that a certain relationship is maintained. That is, when the on-command signals S and S2 are output at a relatively fast cycle as shown in FIGS. 2(a) and 2(b), the output voltage vout of the impedance circuit 22 is as shown in FIG. 2(C). As shown, the detection voltage V
When d becomes higher than the reference voltage Vs, the control circuit 3
is the output frequency of the ON command signals S1 and S2 as shown in Fig. 3 (
a), (b) - gradually lowering to the state as shown in the example;
As a result, the impedance Z of the impedance circuit 22
control so that it becomes large. As a result, the output voltage v
When out begins to decrease and becomes Vd-VS in response to such voltage decrease, further decrease in the output frequency of ON commands Ii S1 and S2 is stopped. on the other hand,
On the contrary, the output voltage V of the impedance circuit 22
When out decreases and the detected voltage Vd becomes lower than the reference voltage Vs, the control circuit 3 gradually increases the output frequency of the ON command signals S1 and S2, so that the impedance 2 of the impedance circuit 22 becomes smaller. As a result, the output voltage V ouL rises, and when it reaches VdmVs in response to such a voltage drop, any further increase in the output cycle of the ON command signals S1 and S2 is stopped. do.

Therefore, by repeating the above-described actions, the output voltage v out of the impedance circuit 22, that is, the DC voltage applied to the brushless morph 1, is made constant. Further, at this time, only reactive power is consumed by the capacitor 22g in the impedance circuit 22, so no heat is generated. Furthermore, the level of the output voltage v out is higher than the level of the reference voltage Vs by r11.
By adjusting the variable resistor 16, it can be raised or lowered within a predetermined range.

In short, according to this embodiment with the above-described configuration, it is possible to sufficiently deal with brushless morphs 1 having different rated inputs, and the standardization of the hardware part can be greatly promoted. In addition, a capacitor 22a which is a voltage variable element
Since only reactive power is consumed, power loss can be significantly reduced compared to conventional configurations that use power transistors as voltage variable elements. Moreover, the capacitor 22a
Since almost no heat is generated in the heat sink, there is no need for a heat radiator as in the conventional case, and the overall size can be reduced, and manufacturing costs can be reduced due to the reduction in assembly man-hours.

In the above embodiment, the voltage detection circuit 12 is provided to detect the output voltage VouL of the impedance circuit 22, but the output voltage VouL may also be directly detected at the input terminal P1 of the control circuit 3. Because it is possible
The voltage detection circuit 12 may be provided as necessary.

Further, as shown in FIG. 5 showing the second embodiment of the present invention, a smoothing glue handle 26 may be interposed in the first current-carrying path 2a, and with such a configuration, the impedance circuit 2
2, the smoothing effect of the output voltage V out can be further improved.

Furthermore, as shown in FIG. 6 showing the third embodiment of the present invention,
After removing the auxiliary single-phase high-wave rectifier circuit 10, the AC input terminal Te of the single-phase full-wave rectifier circuit 16 is connected to the first current-carrying path, and the second AC power supply terminal 4b is connected to the second current-carrying path. 2b
If the configuration is such that an AC voltage is directly connected to the first and second energizing paths 2a and 2b,
Therefore, the AC motor 1' can also be used as a load connected between the output terminals 03 to 05 of the control circuit 3.

In other words, according to the present embodiment, a dual-AC/DC power supply device can be realized by simply changing the configuration by selecting whether or not to connect the auxiliary single-phase full-wave rectifier circuit 10 in the first embodiment.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with various modifications without departing from the gist, such as using a reactor as a reactance element. can.

[Effects of the Invention] As is clear from the above description, according to the power supply device of claim 1, when obtaining a DC power supply, it is possible to promote standardization and significantly reduce power loss, and also to reduce the overall size and manufacture. This has excellent effects such as cost reduction.

Furthermore, according to the power supply device of the second aspect, it is possible to easily obtain an AC power supply that provides the same effects as those described above.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a circuit diagram, and FIGS. 2 to 4 are timing charts for explaining the operation. Moreover, FIG. 5 shows the second embodiment of the present invention.
FIG. 6 is a diagram corresponding to FIG. 1 showing a third embodiment of the present invention. In the figure, 1 is a brushless morph (load), 1' is an AC motor (load), 2a is a first energizing path, 2b is a second energizing path, 2c is an auxiliary energizing path, 3 is a control circuit, and 4 is an AC power supply, 4
a is a first AC power terminal, 4b is a second AC power terminal,
10 is an auxiliary single-phase full-wave rectifier circuit, 11 is a voltage generation circuit, 1
2 is a voltage detection circuit, 16 is a one-phase full-wave rectifier circuit, 17 is a switching circuit, 18 to 21 are photocouplers, 18a to
21a is a phototransistor (non-contact switching element)
, IRb to 21b are light emitting diodes, 22 is an impedance circuit, and 22a is a capacitor (reactance element).

Claims (1)

[Claims] 1. A pair of first and second energizing paths for supplying current to the load, a single-phase full-wave rectifier circuit configured in a diode bridge configuration, and a pair of direct current circuits configured in a diode bridge configuration. an auxiliary single-phase full-wave rectifier circuit whose output terminals are connected to the first and second energizing paths, respectively; and the auxiliary single-phase full-wave rectifier circuit via a pair of AC input terminals of the single-phase full-wave rectifier circuit. a first AC power terminal connected to one AC input terminal of the auxiliary single-phase full-wave rectifier circuit, a second AC power terminal connected to the other AC input terminal of the auxiliary single-phase full-wave rectifier circuit, and four non-contact switching circuits. a switching circuit in which the elements are connected as a single-phase rectifier bridge circuit, and a pair of terminals corresponding to the DC output terminals of the single-phase full-wave rectifier circuit are respectively connected to a pair of DC input terminals of the single-phase full-wave rectifier circuit; , an impedance circuit consisting of a reactance element connected between a pair of terminals corresponding to the AC input terminals of the single-phase rectifier bridge circuit constituting this switching circuit; a voltage generating circuit generating a constant reference voltage; The impedance can be adjusted by controlling the switching frequency of the contact switching element and changing the frequency of the alternating current voltage applied to the impedance circuit, and by adjusting the impedance, the reference voltage and the impedance are outputted through the impedance circuit. What is claimed is: 1. A power supply device comprising: a control circuit that controls the voltage so that it has a constant relationship with the voltage. 2. A pair of first and second energizing paths for supplying current to the load, a single-phase full-wave rectifier circuit configured in a diode bridge configuration, and a pair of AC input terminals of this single-phase full-wave rectifier circuit. A first AC power terminal connected to the first energizing path, a second AC power terminal connected to the second energizing path, and four non-contact switching elements are connected to a single-phase rectifier bridge circuit. and a switching circuit in which a pair of terminals corresponding to the DC output terminals of the single-phase full-wave rectifier circuit are respectively connected to a pair of DC input terminals of the single-phase full-wave rectifier circuit. an impedance circuit consisting of a reactance element connected between a pair of terminals corresponding to the AC input terminals of the single-phase rectifier bridge circuit, a voltage generation circuit that generates a constant reference voltage, and a switching frequency of the non-contact switching element. The impedance can be adjusted by controlling and changing the frequency of the alternating current voltage applied to the impedance circuit, and by such impedance adjustment, the reference voltage and the voltage output through the impedance circuit maintain a constant relationship. What is claimed is: 1. A power supply device comprising: a control circuit for controlling the power supply so as to display the power.