JPS596776A - Inverter device - Google Patents

Abstract

PURPOSE:To reduce the switching loss of a transistor by connecting a DC power source via an inductance element to an inverter circuit, and providing a resonance condenser at the output side of the inductance element. CONSTITUTION:A DC power source 3 is added via a choke coil CH2 to a separately-excited inverter circuit 4 which has transistors Tr1, Tr2, an output transformer T0 and a base drive circuit 1, thereby firing a discharge lamp L. A condenser C5 is provided at the output side of the choke coil CH2, and performed in parallel resonance to the output frequency by the inductance component with the condenser C5 and the inverter circuit 4 regarded from the input side. Accordingly, when all lamps are fired, the top of triangular wave of the collector current can be smoothened, and the peak value of the current waveform can be eliminated at the dimming and firing time of opening a dimming switch SW, thereby reducing the switching loss.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inverter device (
(branch).

An inverter circuit is driven by the direct current W obtained by rectifying or rectifying and smoothing the AC power source, and the discharge lamp is lit by the output of the inverter circuit. ! An automatic self-control type inverter device is used because the l-road configuration is inexpensive because the vehicle in front is the one in front. However, recently, when separately excited inverter devices are used, continuous dimming function can be obtained, so separately excited inverter scissors have been used for the purpose of increasing the functionality of F@ intermediate devices and increasing the efficiency of lighting circuits. The use of self-limiting inverters has been considered due to the rapid development of semiconductor technology, and frequency control is difficult in the case of automatic self-limiting inverters, whereas in the case of separately excited inverters. , This is valuable in that it can be easily used in comparison, and is useful for preventing interference with the Hakugo-giving device [1 (e.g., infrared cooling device 2 for switching TV channels) that uses infrared light. ``As one of the methods, the use of a separately excited inverter device is being considered.

Is there a conventional separately excited inverter device constructed based on the above-mentioned requirements? A configuration example of a sailing lamp lighting table using
c) a
Figures are shown respectively. In this circuit of Fig. 1, the curved
The main transistor Tr is
1. Tr2, output transformer To, and upper transistor 1
'rl + Tr2 base drive circuit tl for busy operation
The inverter circuit +41 consisting of 1 and 1 operates. Dekadrance T. The lamp L is connected to the secondary side of the lamp L through the choke coil CH+f, and the filament of the lamp L is connected to the preheating circuit. (The front circuit is omitted from the figure.) Here, the base drive circuit (1) described in 01J is
! , which has the structure shown in the second example, Menryu Ryōryō (3)
, resistors R, , R, capacitors C, , C, and inverter 161 tfil. ), field effect controller) register (hereinafter referred to as FET+, FETt) Resistance bL Rs~R*
, capacitor C3, C diode D+, l) 2, pulse 7, to 5'' J SPT+, PTs, etc. nl whose output 9a, bKld, Fig. 3 (-1'l)
a).

A drive signal as shown in (b) is obtained. Ding, that is, the first
In the circuit shown in the figure, when the power switch S is turned on, a direct current force is formed by the ridge f21 and the capacitor Co, and at the same time, the main transistor Tr1, 'Tr2 is also driven to turn on and off each other.
Since the current t is forward and n, the secondary winding is connected to the lamp
, obtain the inverter output for lighting. Note that the choke coil CHI is a stabilizing element of the lamp L. In addition, the waveforms of the collector weight If: vc and the collector frost flow Lc of the main transistors {rrl and Tr2 in this case are curved as shown in (a) and (b) of FIG.
i, [f Vc or square wave, koLt') evening [jt+7
ff, Lc becomes a triangular wave and is represented by ycxLc, and the switching loss force is large.

4 and 5 are different conventional examples that solve the problem of "large switching loss" in the conventional example shown in FIG. 1.

In other words, a choke coil CH and a capacitor C5f are added to the circuit configuration of 1"L in both Figures 4 and 5 in Figure 1, and if the choke coil is large enough, As shown in a), the collector current Ii becomes a rectangular wave, and the collector Ii becomes a sine wave (half wave) due to the resonance effect of the capacitor C5 and the choke coil CH, so the main transistor Trl, 1
The switching loss of °r2 can be reduced. Note that the fourth circuit and the circuit in Figure 5 are manufactured in the same way, and these l! ! Base drive circuit in l path (1)
is similar to the example shown in FIG. In addition, the choke coil CH3 shown in FIGS. 4 and 5 is inserted as an example of a current limiting element for dimming, and a dimmer switch SW is connected in parallel to this choke coil CH3. When this dimmer switch SWt is opened, the light is in a dimming state, and when the dimmer switch SWt is closed, it is in a fully lit state.

Thus, in the circuit shown in Fig. 4, when the dimmer switch SWt is closed and all lights are turned on, parallel resonance occurs between the silent capacitance paper of the capacitor c5 and the interface including the output 1111J circuit τ of the inverter circuit (4). Therefore, the waveforms of the collector current +''C and the collector voltage yc of the main transistor T r H + T r 1 are as shown in Fig. 6 (
It is possible to stably run the lamp in a state with little switching loss.

However, when the dimmer switch swt was opened,
, In the dimming mode connected in one row to the circuit of i run'''jtil+, there is a bad parallel resonance with the capacitance of capacitor C5 until then. increases due to the addition of the choke coil CHs, but from the base drive circuit Ill side, the base input of the same wave number is always constant from the main transistor Trl,
The circuit to be given to Tr2 is different from the above-mentioned resonant circuit. This connecting main transistor I
The rector tortoise pressure yc and the rector current Lc of 'r++Tr2 have waveforms as shown in FIG. 6(h), especially
As expected, the cycta'IL has a large pointed straight T: and the main transistors Tr+, Tr! There is a possibility that f-current breakdown may occur, and the switching loss is also quite large, and there is a possibility that thermal breakdown τ may occur.

Fig. 7 t/'i Fig. 5 is an equivalent circuit diagram of the conventional example circuit, in which the same circuit parts as the circuit of Fig. 5 are given the same symbols and numbers, and LI and L2 are output voltages. The primary tactance of T0, L3 indicates the secondary intactance. Thus, the conventional circuit shown in FIG. 5 (FIG. 7) is as follows.
It operates in exactly the same manner as the conventional circuit shown in FIG. 40, and the main transistors Tr, + Tr! ]Rekta turtle pressure? C and the lid current LC change as shown in Fig. 6 (a) when the lamp is fully lit, and as shown in Fig. 6 (b) when the lamp is dimmed. In addition, in these conventional circuits, the collector's tortoise pressure yC and the collector current Lc during full lighting and dimming lighting.
As for the reason for such large changes,
Although there are many parts that are unclear, it can be explained as follows.First, when all lights are on, as is clear from the equivalent circuit in Figure 7, the capacitor C5 and the inverter circuit (4
) interface 1. +xLs is in a parallel resonance state, so it operates as a voltage resonance type, and the collector current 1fvc of the main transistor Tr+* Tr2 is a sine wave (half wave), and the collector current is as follows: ,
If the electric tuftance CHt is sufficiently large, the circuit becomes constant current, so it is thought that it is a square wave, and these operations are similar to those of a constant current push-pull inverter in a self-excited inverter. It is. Next, when lighting is dimmed, by opening the dimmer switch SWi, the E1 tuftance CH is connected in series to the circuit of the run "JL".
, or pushed in, so that the intertasis L3 in the equivalent circuit of FIG.
The resonant frequency of this circuit itself decreases and the base structure 11
Since the frequency differs from that of the base drive signal supplied from circuit 3-11, the circuit will deviate from its resonance point.

However, the mouth lI false in Figure 5 (Figure 7) is l! ! l
For the sake of simplicity, the structure is strictly a '@resonant Shiba circuit, and the main transistors Trl, Try's
tends to be a negative sine wave (half wave) with a period of 1ift. However, due to this resonance, the collector'...l:l:VC becomes
The main transistor Trl, '1''r2
Since the main transistors ``rrl'' and ``Trt'' are turned on at the base of the drive vJ, the nfC energy stored in the output voltage ``rO'' is not sufficiently transferred to the capacitor C5, and the first place of the coefficient + jCS is Because the main transistor Trl・Tr! When the capacitor C3 is turned on, a current flows to the main transistors ``rrl'' and ``l'' to charge the capacitor C3. This is thought to cause the peak of the electric current LC waveform.

As is clear here, if the circuit interface is changed, the capacitor C6 can be placed more conveniently, and if it is arranged so that it always maintains a resonant state, the above-mentioned problem will be eliminated. There are also many electricity charges due to the large number of devices and the clutter.

The present invention has been provided in view of the above points, and includes (I)
In the circuit of tL-2, the main transistor's switch loss is greatly improved, and even in the negative side, such as when dimmed lighting, there is no damage to the main transistor caused by an enemy, increased loss, or abnormality. It is an object of the present invention to provide an inverter bag that does not cause inconveniences such as heat generation.

The present invention will be explained in detail below using an example of the present invention. 8th
(a) shows an example circuit of the present invention,
In the same figure (bl is the equivalent circuit τ).
Figure (for the embodiment circuit of al, please refer to Figure 4 or 5)
]-) For the conventional example, the connection position of the pin dimension C5 is changed, and the child yoke coil CH! A capacitor C5kffl is connected between the output transformer Te 1st connection wire and the negative end of the 11th stream acid source (3), and this connection
j C5 and the interface of the inverter circuit (4) when viewed from its input side, the base drive cut path 11
) The output frequency is made to have 11 resonances τ in parallel. The 9th cause (A) and (D) are respectively at full lighting and dimming lighting - J work d9. It's Akime 1, and I'm in the middle of the battle (
al is the main transistor Tr, and (b) is the main transistor Tr2, respectively] rectifier m, ratio? C and] Rectaden 1
This indicates a critical condition.

This is also the implementation of Figure 8, Example 1! ! In the I path, when the switch S is turned on, the rectifier bridge (2) and the capacitor C8 form a +[i flow south path (3),
Choke coil CH, & output truss T. The collectors of the main transistors TrI and Tr2 are connected through the primary winding.
A DC tactician is applied between the three tsuta. Also, base 1 on this and the circuit! A! glJLg circuit +llk1illll('P
Since the main transistors Trl and TriV are turned on and off each other, current alternately flows through the primary winding of the output transformer T, which produces an output in the secondary winding, causing the choke coil C111 to turn on and off. The lamp L lights up.

If the choke coil CH31m light switch SW is short-circuited, all lights will be turned on, and if the dimmer switch SW'z is opened, the light will be dimmed. However, in this series of production, the electrostatic valley 1-τ inverter 1 of the condenser +j Cs
! ! From the input image of 1lA14+41, it is set to have a resonance state with the intactance, so when the S dimming switching is on, that is, the collector weight ratio waveform of the main transistors ゛rr1 and Trl when fully lit is as follows. It will look like (al(b)) in Figure 9 a). That is, the collector *
, l-1--c is a sine wave (half wave), collector's arm, /
lLe has a waveform similar to the top of a triangular wave, which gently curves, and the switching loss of one main transistor Tr, , Trt is reduced. In this condition, the dimmer switch 5W
trl and dimmed lighting, the collector voltage, current tlc, and bc waveforms become as shown in (aHb) in Figure WJ9 (D), and compared with the waveforms in the conventional example shown in Figure 6 (t+)K, the collector Since the large peak of the frost and current LC wave fβ is gone, the main transistor Tr1. Trt
Due to the increase in the amount of damage and the dimming of the lights,
Since the collector temperature is low, the loss is also low, and therefore stable lighting can be achieved both in full lighting and dimmed lighting.

That is, in the circuit of the embodiment of FIG. 8, the capacitor C5 and
The inverter circuit (4) τ has a resonant circuit including the main transistors Tr, , Tryt, and the interface from the viewpoint of human power consumption, so the dimmer switch 5W
At the time of one light when ffi is closed, the circuit resonates ml=, and the collector I of ox transistor 1" r I + Trfi
It, 1. ty c becomes a sine wave (half wave), and the collector deposit, l circle Lc is (al
The triangular wave phase shown in (b) is considered to be rounded by the filtering effect of choke transformer CH4 and capacitor C5, resulting in the waveform shown in the figure.
Ru. - Power dimmer switch SWT: When the dimming is open, the interface L3 in the equivalent circuit of porridge 8 section 1 (kl) increases, so the common dragon frequency of the circuit decreases and the base structure - J circuit 11), and the resonance point is off. However, in the case of the conventional example shown in FIGS. 4 and 5, the condenser CS and the main transistor
Since the rrl+Trg door 5' is configured in series,
As mentioned above, when the resonance 7Qτ is off, the main transistor
In contrast to rhTr2, the capacitor C6 was in a parallel configuration with the main transistors Tr+, Trt, and the main transistor Trl. , there is no sharp peak current flowing through the Trl.

FIG. 10 shows another embodiment of the present invention, whereas the embodiment of FIG.
This is an example in which an active inverter circuit (4) is configured with one active inverter circuit (4). Mano Figure 11 (a) (b) is the funeral 1
(This is the basic circuit diagram of the conventional circuit that is opposite to the circuit of the Ikuo example and its equivalent circuit diagram.
1.0 The basic circuit diagram of the example circuit and its etc. 1 song 1 vPI section 1. As is clear from FIG. 11, in the case of the conventional circuit, the conductor dimension C5 for resonance is connected in parallel to the interface portion, , L, and is connected in a 1 m column to this compensator +tC6. Since the main transistor Trl is connected to this configuration, when the interface value changes and the peak current from the capacitor C5 flows into the main transistor rrI when it is outside the resonant expansion of IJ. I expected it to be 'i''L.

On the other hand, in the example circuit of FIG. 10, as is clear from the basic circuit diagram of FIG. 12(a) and the equal one-track circuit of FIG. 12(b), Is it normal for a circuit in which the main transistor TrIf is connected to 1 and 11 for l and 3? ll] njin+jC, is in contact with n,
Even if the dimmer switch swt is opened and the circuit is removed from the resonant state, there is no possibility that the main transistor TrlK will flow as a charging current or a peak current in the capacitor C5. , it is possible to significantly reduce the peak fluctuation of the main transistor Trl.

In addition, in Hontsu 6th Akira, he was in the top 1k with 11th and 13th defeats, and was used for surge control, waveform shaping, opening and closing,
[Tanigami of equal noise reduction] It is also possible to connect one Njinsa C or several Virei, and even in this case, the t+mentioned Ichinosaku in Misfire 1'l will have no effect. This is a work by Kan J with the purpose of providing each capacitor without being given the same amount.
As mentioned above, the inventive feature to which this is added is that a separately excited inverter circuit τ is provided, and the power τ is supplied from the first bullet to the inverter circuit via an interface element. The inverter circuit of the above-mentioned inverter circuit 1 and the DC current switch are the same as the inverter 1g circuit as seen from the input side, and the above-mentioned main transistor has approximately resonance at the on and off frequencies. Since the capacitor sold by Tanya Sales 1@ is a busy connection, is it the switching loss of the main transistor? Not only can it be greatly reduced, but also in cases where there are fluctuations in sunlight, such as when switching from a full-lighting center to a dimmable lighting source, the use of large spigots in the main transistor This causes the main transistor to be over-sold due to over-market current, or F′i over-frost, resulting in increased losses in the main transistor due to flow 1 and occurrence of abnormal heat generation, etc. It can be prevented with just one delay, and the same reliability and high efficiency can be achieved.
It's something you can do to keep yourself busy.

[Brief explanation of drawings]

The circuit diagram of the conventional example is shown in FIG. Operation explanatory diagram, Fig. 7 is the equivalent circuit diagram of the 5th conventional circuit, and Figs. (a) and wa) respectively correspond to the operation theory L3'1 of the 8th defective circuit, Figure 1() is a circuit diagram of another embodiment of (non-fired), and Figure 11 ta+tb+ corresponds to the embodiment in Figure 1O, respectively. The basics of the conventional example circuit W!!
Fig. 12 (at (bl is the basic circuit diagram of the 10th embodiment circuit and the equivalent circuit diagram of the 7th embodiment, respectively)
The 13th evil is yet another example of non-invention! l! It's 1llid, 21tB, 1! l! I.M.
(3) is the IgL a 'fT% source, i41 Ld inverter circuit, 'rrl, Tr2 is the main transistor, CH2
is an interface collector (choke coil), C5 is a capacitor, SW is a dimmer switch, and CHs is a choke coil provided as a current limiting element. Agent: Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] ill Main transistor t by base state circuit output
The inverter circuit is configured to turn on and off and drive a negative curve circuit, and is configured to supply power to this inverter circuit from a negative current power supply via an interface element τ. Between the side terminal and @ryuyo, but taisho, there is an interface seen from the input side of the inverter circuit, and a capacitor with a capacitance of 1 m that resonates at the on/off frequency of the main transistor? In an inverter device (21') characterized in that an IAI optical switch or a parallel-connected n-scale current-limiting element is connected to the negative curve circuit in a straight line, a dimmer switch is connected to the inverter device (21'). 2. The inverter device according to claim 1, wherein the capacitor τ substantially resonates with respect to the intactance seen from the input side of the inverter circuit when the inverter circuit is fully lit after being closed.