JPS59181967A - Power source - Google Patents

Abstract

PURPOSE:To simply and accurately reduce the noise terminal voltage between- line and the ground by connecting a reactor for limiting a charging current to the negative side of a power storage capacitor, thereby eliminating a high frequency noise to ride on a power source line. CONSTITUTION:A reactor 3 in an L-shaped filter is connected to the negative side output terminal of a rectifier 1, and a condenser 2 is connected between the output terminal of the reactor 3 and the positive side output terminal of the rectifier 1. An inverter 6 is driven by a drive circuit 39. A current limiting inductor 16 is connected to the negative side of a power storage condenser 4, and the positive side of the condenser 4 is coupled directly to the positive side of a power source line. An abrupt change of the charging current which is flowed from the rectifier 1 to the condenser 4 does not occur, and the potential across the condenser 4 is stabilized.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a power supply device used, for example, as a discharge lamp lighting device. Various power supply devices such as discharge lamp lighting devices have been proposed.

FIG. 1 is a circuit diagram (unknown) of a power supply device previously proposed by the applicant and others. In the figure, l is a full-wave rectifier circuit,
After converting an AC power source such as a commercial power source into a DC voltage, an Lm low-pass filter consisting of a capacitor 2 and a reactor 3 that flows one charge current to the capacitor 2, a power storage capacitor Hiroshi, and an isolation diode J. The DC voltage is applied to a one-system transistor inverter B through a power storage means. Here, the rectified output has its high frequency component removed by the capacitor and is applied to the capacitor. The capacitor accumulates 1 pressure from the L-type filter via the inverter O, and also
．． The inverter ZK supplies power when the output of the L-type filter is lower than a predetermined voltage.The inverter 2 in this case has an output transformer 7 and a switching element that switches the current in the first winding of the output transformer 7 at high frequency. , for example, includes a transistor g and a drive circuit for driving this transistor (♂). The drive circuit includes a drive capacitor 10 connected between the base winding (feedback winding) 73 of the output transformer 7 and the base side of the transistor g, and a capacitor 1 connected in parallel to the capacitor 10.
A resistor that discharges a charge of 0 // and a diode 7
．． 2, a reset switching element connected in parallel to the resistor / to shorten the discharge time of the capacitor 10, for example, a transistor /3, and a bias resistor /1 connected between the base and emitter of the transistor /3. be done.

In this drive circuit, the electromotive force induced in the base winding 73 of the output transformer 70 is returned to the base of the transistor g via the capacitor 10 to turn the transistor g on and off at high frequency. A high frequency voltage is applied to a load 100 such as a discharge lamp through a resonant circuit composed of a winding S and about 71 and a secondary winding 72. In Fig. 1, the inductor /6 connected in series with the capacitor≠ limits the charging current of the capacitor flowing through the capacitor≠ and the diode /7 to adjust the power stored in the capacitor. do. Furthermore, between the (A) side of the L-type filter and the base side of each transistor, a bias resistor 7g and a parallel circuit of an inductor/q and a resistor 20 are connected in series to improve the turn-off characteristics of the transistor g. ing. The diode connected to the emitter of the blue transistor is used to protect transistor G from emitter-base reverse voltage.

FIG. 2 is an explanatory diagram of the operation of the power supply device configured as described above. Here, when the AC voltage v1n is manually generated, this AC voltage Vin is full-wave rectified by the full-wave rectifier circuit l and is applied to the L-type filter and the power storage means. 'The power storage capacitor μ is connected to the rectifier circuit / -+ L fjl filter → inductor / l → capacitor → diode /7 → transistor every time transistor g of inverter B is turned on, and the current flowing in a closed loop moves it in a predetermined direction. On the other hand, when the rectified output given through the L-type filter becomes less than a predetermined voltage (i.e., the charging voltage of the capacitor μ) every half cycle, the capacitor is discharged through the isolation diode j, and this discharge Give the output to inverter B. In other words, the power storage capacitor has a voltage waveform V across it. 11'h'' - As shown in FIG. 2, it is charged when the transistor g is on during the high period of the rectified output given through the low-pass filter, and is discharged during the low period of the rectified output to the inverter B. Then, the voltage v8 across such power storage means
When b is applied to the inverter B, a base current iB1 flows in the loop due to the resistance xo → transistor, which turns on the transistor ○. Then, due to the resonance of the inductor /9 and the capacitor 10, , a base current flows through the transistor g in the direction opposite to the forward bias, and the transistor r is turned off. Voltage V between point 0 and point d when the time axis of the d waveform is long (see the d waveform and the voltage V across the capacitor 10 (see the d waveform). When the transistor turns off, an electromotive force is generated in the direction of the broken line in the base winding 7, and as a result, a base current iBz flows through the bias resistor /l, turning on the transistor /3. Therefore, the charge in the capacitor 10 is transferred to the transistor /3 is rapidly discharged through the transistor r, and the transistor r is reset. In this way, the transistor r turns on and off, and a high frequency voltage V is applied to the load No. 00 through the output transformer 7. ut
is applied.

In such a power supply device, since the rectifier circuit is non-smooth, the human power factor is high, and in an area where the output voltage of the rectifier circuit I is lower than a predetermined voltage, the DC voltage is . , so that even though a non-smooth current output is used, there is no rest period and a high frequency output with little ripple is generated. In addition, since the rectified output is supplied to the power storage means and the inverter 2 via the L-type filter, the load 1
When the terminal voltage of the capacitor V is low when dimming a zero discharge lamp, the rush current flowing through the capacitor μ to the seventh winding 71 and the collector of the transistor can be reduced.

That is, since the current of the capacitor≠ is mainly supplied from the capacitor λ, even if an inrush current attempts to flow into the capacitor μ at startup, for example, the voltage across the capacitor 2 decreases, thereby suppressing the inrush current. Therefore, an output transistor r with a small rated current can be used.Furthermore, since the input terminal of the power supply device has an L-type filter to remove high frequency components, it is possible to prevent high frequency current from flowing into the AC power supply. It has the advantage of improving the employee participation rate. Furthermore, since the drive circuit is equipped with a transistor/3 for the beam set, the charge in the capacitor 10 is rapidly discharged, shortening the recovery time, and has the advantage of increasing the excavation frequency of the inverter. . Therefore, if a discharge lamp is lit with the high frequency output of this power supply device, it will be lit with good luminous efficiency, and by rectifying the high frequency output of the casing, it will be possible to obtain a DC output with less ripple.

[Problems with background technology]

However, in this type of power supply device, a power storage capacitor is provided at the output end of the L-type filter via an inductor/6, so the potential of this capacitor μ becomes unstable with respect to the power supply line, and the stray capacitance CO There was a problem in that high frequency noise easily entered the power supply line through the cable, and the noise terminal voltage level between the - line and the ground was extremely high.

[Purpose of the invention]

The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide a power supply device with a low noise terminal voltage level.

[Summary of the invention]

To achieve this objective, in the present invention, in the conventional power supply device, the charging current limiting reactor of the low-sis filter is connected to the ←) side of the power storage carrier Z-sitter to reduce the level of the noise terminal voltage. 0 [Embodiments of the Invention] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the following drawings, the same elements as those in FIG. 1 and FIG. 1 are designated by the same reference numerals.

FIG. 3 is a circuit diagram of the power supply device according to this embodiment. This power supply device is different from the one shown in FIG. 1 in that the connection state of each component in the power storage means in the L-type filter is different.

That is, in this power supply device, the reactor 2 in the L-type filter is connected to the C→ side output terminal of the rectifier circuit 1, and a connection is made between the output terminal of the reactor 3 and the (4) side output terminal of the rectifier circuit 1. This depends on connecting capacitor 2. Furthermore, the rectifier circuit
The power storage capacitor t, the current limiting reactor 16, and the cathode side of the isolation diode S are connected in series to the (g) side output terminal of the diode! Furthermore, the drive circuit 39 of the inverter B is configured as shown in FIG. 1, with its anode side connected to the output side of the reactor 3. That is, in this drive circuit 39, an auxiliary winding 711 connected in series with a base winding (feedback winding) 73 is wound around the output transformer 7, and the primary winding 71, the base winding 73, and the auxiliary winding 7
The winding direction is opposite to that of u. The auxiliary winding 71I is connected to the ←) side of the rectifier circuit l, and the base winding 73 at the other end is a reset switching element, for example, P
The emitter of the 0 transistor phantom connected to the NP transistor phantom pace via a bias resistor is the base winding 7.
3 and the auxiliary winding a7u, and a series circuit of a drive capacitor SO and a diode tacho and a resistor S are connected in parallel between the emitter and collector of the transistor. The emitter-collector of the transistor, the diode 5.2 and the capacitor 50 form a discharge loop for the capacitor SO.

The junction point between the cathode of the sweet diode 32 and the capacitor 50 is connected to the switching X element of the inverter O, for example, an NP
N) Which transistor is connected to the base side of the drive circuit 39"f: This is how the drive circuit 39"f: is drawn. When the human power is turned on, the transistor g is turned on, and due to this, the capacitor IS and the primary winding 71 resonate. Circuit→Transistor A collector current flows between the emitter and the collector.Then, the base winding 73 and the auxiliary winding 74
The electromotive force in the direction of the real arrow in the figure is induced, and the base winding 7
Due to the electromotive force generated in 3, the transistor Hiroshi,? is biased in the opposite direction and turns off, and the auxiliary winding 71F
The electromotive force generated charges the capacitor SO. Q due to resonance of inductor/q and capacitor 50
) When a base current in the direction opposite to the forward bias flows through the transistor g and the transistor g is turned off, the collector current of the transistor is divided into base windings 7 and 7.
5 and the auxiliary winding a7u in the direction of the broken mark in FIG. 3, and the electromotive force generated in the base winding a73 causes the transistor≠, ? is forward biased and the transistor 5 is turned on, and the charge in the capacitor SO is transferred from the emitter and collector of the transistor to the diode 5.
It is discharged and reset in a closed loop of 2. In this way, in this drive circuit 39, a reverse bias is applied to the reset transistor during the on period of which transistor. When the transistors 11- and 1 are in the off state, only the on period of which transistor is reliably resentenced. Therefore, in the power supply device shown in Fig. 1, when a phase-controlled AC voltage ■in as shown by the broken line in Fig. 1 is applied as an input for dimming, when the transistor is turned on, the inductor /9 and the capacitor 10 resonates and the base current iB2 flows, which turns on the p-reset transistor 13 and the charge in the capacitor 10 cannot be reset sufficiently, causing the inverter to stop oscillating due to insufficient drive of the transistor. can be prevented.

In this embodiment, the current-limiting inductor 16 is connected to the power storage capacitor ←)0111, and the (+ side of the capacitor μ is directly connected to the power supply line (→1111K), so that this Rapid changes in the charging current flowing into the capacitor μ are eliminated, and the potential across the capacitor ≠ is stabilized.For this reason, as shown in Figure 1, when high-frequency noise gets on the current line via the stray capacitance Co, it becomes 1x5. The harmful effects can be easily and accurately prevented.Furthermore, if the inductor 3 of the L-type filter is connected to the (-) side output terminal of the rectifier circuit, the noise blocking effect is further improved.For example, the AC voltage vin is set to 200V-5OHz. , load 1
As a result of measuring the noise terminal voltage between one line and the earth using a two-lamp open lamp as 00, it was found that the conventional fOdB was 1
．． In the above embodiment, the drive circuit 39 has an auxiliary winding m7.
11 is provided, but the same operation can be performed without providing such an auxiliary winding 71I by using the term photocoupler, for example, as shown in FIG. That is, in this drive circuit 39', the photocoupler S3
A series circuit of the light emitting diode 51 and the current limiting resistor 9, which constitute the light emitting element 3, is connected in parallel to the base winding 73.
A phototransistor 55 paired with h is connected in parallel to the resistor 51. In this way, the electromotive force of the base winding υ75 induced when the lever and the transistor are turned on is applied to the light emitting diode 55 in the opposite direction, so that the transistor S5 is turned off, and only the ON time of the transistor is reliably reset. . Further, in the above embodiment, a self-excited single-stone transistor inverter is used as the inverter t, but a separately excited type may also be used, and the transistors ff, '7. ? , 55 may be used.

〔Effect of the invention〕

As explained above, according to the present invention, since the charging current limiting reactor is connected to the (-) side of the power storage capacitor, the (G) side of the power storage capacitor is connected to the (A) side of the power supply line. This stabilizes the potential of the power storage capacitor with respect to the power supply line, and high-frequency noise from the power storage capacitor, etc. is transferred to the power supply line via stray capacitance, reducing noise between the ground and the ground. Terminal voltage can be reduced easily and accurately.

[Brief explanation of the drawing]

FIG. 7 is a circuit diagram of a conventional power supply device, Section 2 is an operation explanatory diagram of FIG. 7, FIG. 3 is a circuit diagram of a power supply device according to an embodiment of the present invention, and FIG. FIG. 2 is a circuit diagram of a Td power supply device according to an embodiment. l... Rectifier circuit! ... Capacitor, 3... Inductor, G... Capacitor for power storage, B... Inverter, 7...) Lance, J, /3. /4
', 3! ;...Switching element, 39.3
9'...drive circuit, 10. ! ;0... Capacitor for drive, //, Ivy... Inductor, 10
0...Load. Applicant's agent Kiyoshi Inomata Engraving of the drawings (one copy exists, no changes) Figure 2 Procedural amendments dated May 1, 2016, Director of the Patent Office Kazuo Wakasugi, 1, Indication of the case Showa patent application No. 5564] No. 2, Name of the invention Power supply device 3, Relationship with the person making the amendment Patent applicant (375) Toshiba Electric Materials Co., Ltd. Drawing 8, Contents of the amendment Engraving of the drawing (no change in content)

Claims (1)

[Claims] (1) A rectifier circuit that rectifies alternating current voltage, a capacitor and a reactor low-pass filter connected to the output end of the rectifier circuit, a power storage capacitor connected in series to the output side of the low-pass filter, and this capacitor. A charging current current-limiting reactor that limits the charging current to the battery, and a DC voltage applied through the low-pass filter, the power storage capacitor, and the sufficient current limiting reactor are turned on and off by a switching element to generate a high-frequency voltage. The charge current limiting reactor is connected to the (→ side) of the power storage capacitor, and the power storage capacitor has a rectified output given from the rectifier circuit via the low-pass filter. A power supply device O (2, in the device according to claim 2, the low-pass Power supply device 0 in which the reactor of the filter is connected to the ←) side output terminal of the rectifier circuit.