JPS59220081A - Power source - Google Patents

Abstract

PURPOSE:To smoothen the input of an inverter to a DC voltage while increasing the efficiency by charging an auxiliary power source by a pulsating power source through a switching unit and complementing the low voltage period of the pulsating voltage by the auxiliary power source. CONSTITUTION:When a switching unit 4 is ON and a switching unit 5 is OFF, an inductor 8 and a capacitor 9 resonate. When the unit 4 becomes OFF and the unit 5 becomes ON, a capacitor 21 is charged by a high frequency current limited by an inductance 22 at the switched pulsating voltage. In other words, an auxiliary power source 20 is charged only when the unit 5 is ON. When the voltage value across the terminals of the power source 20 exceeds the pulsating voltage value, an inverter 3 is energized from the power source 20 through a circuit of the capacitor 21, the unit 4, the inductor 8, the capacitors 9,7, a diode 23 and the inductor 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device that includes an inverter and can be used for lighting an electric lamp.

A known device of this type is one in which a DC voltage obtained by rectifying and smoothing an AC voltage is input to an inverter, but this requires a relatively large capacity capacitor for smoothing. In addition to being expensive and large in size, they are of the so-called C input type, which has the disadvantage of lowering the input power factor.

On the other hand, as a means of achieving a high power factor,
-1:36624 was proposed.

This device has a large-capacity capacitor that smoothes the rectified output, but a relatively small-capacity capacitor that charges the voltage obtained by rectifying a part of the inverter's output voltage. It attempts to bring the input voltage to the inverter closer to the smoothed DC magnetic voltage by supplying the capacitor's charged E charge to the inverter during the low voltage period (trough) of the rectified output. Therefore, this device does not require a large-capacity capacitor, and it is thought that the input power factor can also be improved. However, in this case,
In order to take out part of the output of the C-C inverter for charging the small capacity capacitor mentioned above, a special transformer or output winding must be used, which increases the number of parts and makes the transformer winding work complicated. It is something that can never be considered.

The present invention has been made in order to eliminate the drawbacks of the conventional devices described above, and it is possible to achieve a high power factor and to reduce the cost without the need to add a special transformer or output winding. The purpose is to provide the following.

The present invention converts a pulsating voltage from a rectifier into an AC IE voltage by an inverter having at least a pair of switching devices that alternately turns on and off the pulsating voltage, and the pulsating voltage is converted into an AC IE voltage during a high voltage period of the pulsating voltage. When one of the switching devices specified among the pair of switching devices is turned on, the pulsating current is charged by the pulsating voltage through the switching device that is on, and the pulsating current is charged during the low voltage period of the magnetic pressure. The present invention is characterized in that at least one auxiliary power supply device is provided on the output side of the device for supplying a full load to the inverter.

The present invention compensates for the pulsating magnetic pressure (low voltage period) by the auxiliary Iαα racking device, so that some of the input voltage can be brought close to the 7”C DC voltage. As a result (with the same capacity), it is possible to make the output voltage of some parts have a ripple envelope of J-smaller than a pulsating voltage that is simply a pulsating current of AC voltage.

In this way, if the ripple of the envelope in the output voltage of the inverter is small, the luminous efficiency can be increased when lighting a discharge lamp, for example.

When converting to DC magnetic pressure again, the smoothing capacitor for low frequencies can be made unnecessary or the amount can be reduced to 1J1.

In addition, the present invention does not require the use of a transformer or output winding, since a part of the output of the inverter is not taken out for charging the auxiliary power supply, and the structure is simpler than that of the above-mentioned publication. There are things you can do.

In the present invention, the inverter is required to have at least one pair of switching devices that are turned on and off alternately, and the formation of the inverter is not particularly limited. That is, the inverter may be a so-called serial type inverter, a parallel type inverter, a No. 7 bridge type inverter, a full bridge type inverter, or the like. Furthermore, the switching device may be of any type, such as a transistor or an SCJ gate turn-off thyristor. The oscillation frequency of such an inverter is set to be more than twice the frequency of the alternating current voltage input to the rectifier, for example, set to be higher than an audible frequency.

Furthermore, the on/off control of the switching device may be either a so-called self-excited type or a passive type.

Further, in the present invention, the auxiliary four-source device can be configured using a capacitor or a battery.

Switches and diodes are connected to these capacitors and batteries to control charging and discharging, and if necessary, current-limiting elements and other communication parts are connected to them. However, it is not limited to this, and can also be used for other loads.

Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure and FIG. 2 show the first embodiment. (1
) is a rectifier that converts the output from the AC power supply (2) into a current and outputs a pulsating current [i pressure]. (3) is an inverter, which is a pair of switching devices (4) that alternately turn on and off.
), (5) For example, it has a transistor.

FIG. 1 shows a no-7 bridge type series inverter. That is, the switching device (4j, (5)
and a pair of capacitors (6) in parallel.

(7) are connected, and the switching devices (4), (
5) and the connection point of the capacitor (61', (7J
An inductor (8) and a capacitor (9) forming a series resonant circuit are connected between the connection point and the connection point. The cod is a load and a round.

(1z is a diode for voltage limiting. Also, 04 is a drive device that controls the switching of the switching devices (41, (51). Such an inverter (3)
itself is well known.

The auxiliary power supply device is provided on the output side of the rectifying device (11).In this embodiment, the one having only one auxiliary power supply device (21) is shown.This auxiliary power supply device (
A) is, for example, composed of a capacitor (2D), an inductor as a current limiting element, a diode for air current, and a charging diode (241).

Next, we will discuss the effect. A pair of switching devices (4J
, (51 is the drive device (131 for example 20K
Hz-('Assuming that it is being turned on and off alternately, now,
As shown in Figure 2, during the high pressure period (1+) of pulsating output, when the switching device @ (4) is on and the switching device (5+ is off), the (+) side of the rectifier @ (1) - Switching i [+4) - Inductor (8) - Capacitor (9) - Capacitor (7) - +- of rectifier 03) fI
ll path is formed and the inductor (8) and capacitor (9) resonate. Next, the switching device (
When the switching device (5) is turned off and the switching device (5) is turned on, a switching device Vfi (5) path is formed, and the inductor (81+9- and capacitor (91) resonate. At this time, by turning on the switching device (5), the clear current Device (1) (monthly lesson - capacitor (2υ - inductor (22
1 - diode (241 - switching device (51 - rectifier (1) (-111111 path is formed) C1
The capacitor (21+) is charged by high frequency current limited by the switched pulsating voltage by the inductor 02. In other words, the auxiliary power supply device (2IJ1 is charged only when one of the specified switching devices (54) is on.Then, the above operation is repeated to reduce the pulsating voltage to a low voltage as shown in Figure 2. During the period (t,), when the voltage value at both ends of the auxiliary power supply #f21J exceeds the pulsating current voltage value, the inverter (:3) is connected to the capacitor (2D-switching device fet ()) from the auxiliary It power supply 41-Inductor (8)-Capacitor (9)-Capacitor (7)-
The input magnetic pressure of the inverter (3) is as shown in the second diagram.The voltage across the auxiliary four-source device (21,
The length of the period ([, ] shown in Figure 2, the gradient of Iil pressure in the period (+2) in Figure 2, etc.
It is easy to understand that it can be selected arbitrarily to some extent by selecting 1) and the inductor @.

FIG. 3 shows another embodiment. Parts that are the same as those in Figure 11 are given the same reference numerals and explanations are omitted.

In this embodiment, the load is 0 (to) the torrent light. Ma7
In this embodiment, the rectifier (1) and the auxiliary power supply S-
(A high frequency filter Gυ is provided 1m between the two. Furthermore, a fly moon is installed in parallel with the switching device (4);
A diode 0 side is provided for eel. The operation of this embodiment can be easily understood from the operation described with reference to FIG. 1, so a description thereof will be omitted.

Figures 4 to 6 show examples using the ``inno'' (-) format of the pond.The same parts as in Figures 1 and 3 are denoted by the same reference numerals, and explanations are given below. The inverter shown in FIG. 5 (51 is a part of a solid bridge type inverter) is omitted. , 6th
The inverter shown in the figure is a parallel 3b inverter. These, inno (-ta (41, (5α, , +rl
Since the configuration of IJ itself is well known, a detailed explanation of IR and IB will be omitted.
,...I/)'C also has a pair of switching devices (41)
, (4, Gυ, 62.佑υ, (64 force) (turns off and on alternately. The actions of the embodiments shown in FIGS. 1 to 6 can be easily understood from the actions shown in FIG. 1, so we will explain them here. omitted.

FIGS. 7 to 12 show other embodiments of the auxiliary power supply device, which can be replaced with the auxiliary source device shown in FIGS. 1 and 3 to 6. be. The auxiliary source device (t'rO) shown in Figure 7 uses a Zener diode (7D) as an isolation diode, and conducts when an overvoltage occurs across the auxiliary source device (lO). In Figure 8, a switching element (for example, 8CR) is used in place of the isolation diode, and a phase detection circuit is used. The switching element [F]υ is turned on at an appropriate phase of the pulsating intraocular pressure.Such an auxiliary power supply '81)
In this case, by selecting the phase in which the switching element (8I) is turned on, it is possible to manually apply the voltage shown in FIG. 13 to the inverter. The auxiliary power source device (91 in Figure 5g9 is a current limiting element e4 provided on the cathode side of the light duty diode (24+). Also, the auxiliary power source device (100) in Figure 10 is a capacitor C2.
D has a different charging period, and if this is applied to the one in Figure 1, it will be charged when the switching device f(4) is on. However, this auxiliary power supply device (100) cannot be used as is in the one shown in FIG. The auxiliary power supply shown in Figure 1 & (110) is a batch ') CF instead of a capacitor.
lJ). The auxiliary r in FIG.
By using a series circuit of B and a capacitor (122), and further adding a diode (123) for the flywheel,
The resonance point of the inductor (121) and capacitor (122) is selected to be slightly higher than the switching frequency of the inverter (f'). You may choose to receive a slightly lower pressure.

Figure 14 shows two auxiliary power supplies (20,) + (2o
z) is used. The same parts as in Figure 4I are designated by the same reference numerals. In this implementation F3, one auxiliary power supply device (201) is a capacitor (21
1), current-limiting impedance (22m), isolation diode (231) and charging diode (2)
4+) force 1, a pair of switching devices f4J,
(One of the switching devices (57) of 51 is charged and disconnected when it is turned on, and the other auxiliary power supply device (20,) includes a capacitor (212), a current limiting impedance (222), and an isolation diode. (232
) and a charging diode (24t), and is charged when the other switching device (4) is turned on. And auxiliary 4-source device (20+), (
20), corresponding parts can have the same performance.

In this case, if the characteristics are similar to those shown in the first diagram, the capacitance of each of the capacitors (211) and (zxt) can be approximately half that of the capacitor (211) shown in the first diagram. According to , a pair of switching devices (41+ +51 each have an auxiliary power supply device (201)
Alternatively, in order to pass the charging current (202), when transistors are used as the switching devices t41 and +51, the base currents of each transistor can be equalized. Note that in this example, the capacitor (2
11) - Current limiting impedance (22υ - Magneto-optical diode (241) - Charging diode (z4.t) - Current limiting impedance (222) - Capacitor (21,) A closed circuit is formed, but each auxiliary power supply device (201),
By selecting the constants of each component so that the voltage of (2oz) is higher than half of the output voltage of parallel current device (1), each auxiliary power supply device (20+), (20t) is connected to switching device (4). Or (5) it is charged with ``C''. Furthermore, the provision of two auxiliary power supplies as in this embodiment can also be applied to those shown in Figures 3 to 6, and the auxiliary power supplies shown in Figures 7 to 12 may also be used. It is something.

Note that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways. For example, in addition to the description of the auxiliary I-E source and grinding device,
C, which is a suitable combination of those shown in FIG. 11, is also good.

Further, the current limiting element used in the auxiliary power supply is not necessarily necessary, and can be omitted, for example, when the switching frequency of the inverter is high. Yo, do,
When the switching device is a transistor and a charging current is passed through only one switching device as shown in FIGS. 1 to 6, the base DC of one switching device is connected to the base magnet of the other switching device. You can stutter by pre-designing it so that it is fluent and easy to stutter. Furthermore, the base current may be made different between the charging period and the discharging period of the auxiliary power supply device. Of course, if the switching device is an SCR, the above means is not necessary.

As detailed above, the present invention charges an auxiliary power supply device with a pulsating voltage through a specific one of a pair of switching devices in an inverter,
Since this auxiliary power supply compensates for the low voltage period of the pulsating voltage, it is possible to bring the input voltage of the inverter close to the smoothed DC voltage while achieving a high power factor. Since no transformer or output winding is required, the number of parts can be minimized and the product is inexpensive.

This allows for miniaturization.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the first embodiment of the present invention, FIG. 2 is a voltage waveform diagram showing the effect of FIG. 1, FIGS.
FIG. 4 is a circuit diagram showing another embodiment, FIGS. 7 to 12 are circuit diagrams showing an embodiment of the auxiliary power supply device, and FIG. 131 is a four-voltage waveform diagram showing the operation of FIG. 8. (1) Rectifier (31, (41, 50, (60... Inverter (20
1, (2Q+) , (20z) , (7G, (80,
(91, (14)0) , (110) , (120
) Auxiliary device patent applicant Toshiba IF Zai Co., Ltd. Katasha representative Patent attorney Ono 1) Fang Buddhism 1 Mouth wisdom Z Mouth wisdom 3 Seno 1 Lock No. 5 O 7 Mouth Sai 8 &2'9 Threshold
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Flash

Claims (5)

[Claims] (1) a rectifier that rectifies AC power supply voltage and outputs a pulsating voltage; an inverter that has at least a pair of switching devices that alternately turn on and off and converts the output of the rectifier into AC voltage; and the rectifier When one of the switching devices specified among the switching devices is on during the high voltage period of the pulsating voltage, this switch is charged from the pulsating positive pressure through the switching device. A power supply device comprising: at least one auxiliary power supply device that supplies charge to the inverter during a low voltage period of the pulsating voltage. (2) The inverter has a pair of switching devices connected in series between the output terminals of the rectifier.
) listed power supply. (3) The inverter has a pair of switching devices connected in parallel to each other between the output terminals of the rectifier.
) listed power supply. (4) The auxiliary power supply device according to any one of claims (1) to (3), characterized in that two auxiliary power supply devices are provided corresponding to each of the pair of switching devices. power supply. (5) The auxiliary power supply device includes a series circuit including a capacitor and an isolation diode provided between the output terminals of the rectifier, and a connection point between the capacitor and the isolation diode and the pair of switching devices. Claim (11) characterized in that the device has a charging diode provided between a point
The power supply device according to any one of (4) to (4).