JPS5836177A - Controller for inverter - Google Patents

Abstract

PURPOSE:To obtain an output voltage waveform which has less content of non- theoretical harmonic by employing signal which is obtained by comparing a triangular wave signal with a waveform signal biased to a sinusoidal wave. CONSTITUTION:A pulse width modulation type inverter 4 which has a main circuit connected with a plurality of arms of a pair of switching elements 5a, 5b, 6a, 6b is formed between positive and negative DC buses. The first comparator 38 which compares a sine wave signal S10 with a triangular wave signal S2, the second comparator 3a which compares a waveform signal S11 biased to a sine wave with the signal S2, and AND circuit 40 and NOR circuit 41 which respectively receive the outputs of the first and second comparators are provided, and the outputs of the circuits 40, 41 are respectively applied as firing signals to a pair of switching elements 5a, 5b forming the arms of the main circuit.

Description

[Detailed description of the invention] This shaft beak has a pulse of 1 m at 1 o'clock regarding an inverter 1v11 control device. , lI: K11l (PWM) type c
VcIF (conetant voltage c
(onstani frequency) It is suitable for application to inverters with mZ%.

Conventionally, as for this type of inverter, the main circuit (1) in Figure 41 and the 1IlI# circuit (2) in Figure 2, which rarely uses electricity, are DC (1, +8), and (4) is Transistors (5a) to (hb) as a pair of switch elements constituting a valley arm in the direct voltage source (positive and motherboard -p and) Il'14 of a single-phase transistor 1 patterner.
, pyroelectric power return diodes (7a) to (sb) and t
M. The outputs -χ and I derived from the valley arm are connected to a filter (b) consisting of a filter reactor (9) and a filter condenser, and a filter (b) to a jIL load, and an output voltage detection device (to). Minegun is echoing.

On the other hand, # circuit (2) is connected to the output 'voltage controller, I
The &/- output is given to the triangular tiL regeneration circuit.

The inverter output 8aτ is strongly applied to the triangular tiL generating circuit end and the sine wave generating circuit, and thus the sine wave value of the sine wave of the generator tR is -11jJ3
11H Angle generator circuit 4) is given to the comparator as a force comparison human power, and a triangular wave 1d No. E1 of the same frequency with an amplitude tM corresponding to the output of the output 4 pressure 114 bell sub.
2, it is obtained from the occurrence times and given to the comparator as a comparison input for opening.

The output 8s of this comparator is given by the ignition pulse P, ~P, bk interlock circuit (27m) ~ (28b) with a width of λ to the valley transistor (5~6b): I distribution - tLo given to the line ends.

Here, the interlock circuits M(27a) to (2ab), as shown in Fig. The ignition pulse τ delayed by the delay time of the 1811 and the ignition pulse delayed by the delay time of the 1811 is designed to be able to be output.
b.

As explained about the action of 廄Vkogeki Ayu (2), the creation of ``2 Oueguchi #4 (1)'' is well known.

In Fig. 2, the output 84 of the output voltage regulator (Kono's output 84 and the output '-pressure rough feedback 16 5 are given to the -f:9 output voltage controller, and the output 11! pressure controller IAO output every number. 86 & 23 Frequency% Ikuen Tsumugi [jl
i +M, oxidizes the peak value of Misumi Saka No. 15 820 and reduces the output '-pressure.Incidentally, if the anti-high value of Misumi Saka 15i S2 becomes high, the output voltage will decrease, and if it becomes low, the output voltage will increase. . However, the sine generated by the sine generation circuit 4 is 1! One adult horse of No. 81 is kept in one ward per foot.

However, the sine wave generation circuit and the triangular wave generation circuit give a constant number of output waves according to the number of outputs from the S practice (synchronized with 1v87 and generated n9 sine technique). g1
No. S1 and the triangular hexagonal note 82 are supplied to the comparator 0. For example, if the sine wave m 81 corresponds to the X-phase voltage, the output 85 of the comparator is as shown in FIG. This is an ideal firing signal waveform for the transistor (5a). The output 85 of the transistor (5b) is fed to a distributor where the ideal firing signal for the other transistors is formed from the ideal firing signal for the transistor (5b). ) for the transistor (6a
), and further invert this anti-phase note to create a firing signal for transistor (6b).

However, power transistors generally have a turn-off time of a few microns.
Since it takes 10 μl of time to use this power transistor, the li'11411) transistor (sats (6a) and Mlilil) fungistor (5b
) and (6b) are fired at the same time and the short M current does not flow, the transistor with the most power in the valley arm is turned off, and 7c imitation - Ashikikaku (transistor turn-off 11# threshold 1.5 ~ 2
ift), the local transistor turns on and the ignition No. 18 τ is given. 9, this timing & 14-karat gold ffi interlock circuit (271 to (+ to 28)) generates the ignition pulse [delay This is done by delaying the signal by the delay time of the circuit.

However, in order to obtain PWM @ No. 1 by using the comparison between the sine correction note B1 and the triangular m signal 82, the operation shown in Fig. 4 is performed. Now, if the sine slope shown in Figure 4 is used as the sine slope for the X-phase voltage, the Y-phase voltage will have an opposite phase, and on the other hand, the triangle a will be multiple l! for the 1j11 period sine wave.
Occurs separately. For na & v4 mackerel, it is selected as 9 in which ten to several dozen triangular waves are generated in one period circle, but in yaku, it is indicated as sgB.

In this way, the ideal firing signals for each transistor (5&) to (6b) are generated as shown in Fig. 4, B1 to B4. However, ill upper interlock circuit (27m
) ~ (281z) K! ↓
The firing is delayed by Δt, resulting in a nine-point firing note. Thus, at the output end of the inverter (-), as shown in FIG.
! 111, Lp ignition is delayed due to the interlock tglWt (27a) to (28b) with respect to the ideal output shaping as shown in FIG.

The reason why the method of obtaining 1 is adopted for comparing the ignition deviation ignition positive sign am s1 and the triangular wave Note 82 is that the output voltage t
This is because it is possible to reduce the low-order harmonics included in the shadow, and to achieve an Ifr constant @[(for example, a voltage distortion rate of less than 5 -n) with a small output filter.Incidentally, according to this method, In principle, in the case of triangular wave number IM binding, the output voltage height t14
The strict low permanent ridge of tft becomes 11-1, and as Ml increases, the strict low order Ai becomes high order, and the 11th wave becomes high order, making the filter smaller. However, interlock m [(27m) to (28b)
Friendly ignition notes used P□1~P, bL: Because the D waveform is disordered, the output voltage waveform is different from Ea, and the output is low (6 selections, 5th order, 7th order...・In the absence of N's unreasonable harmonic high-key he busy-containing M, he was doing 4bM.In other words, conventionally, if you focused only on the 2-'sb-key he and set up the fill,
Although the filter becomes smaller, the JW'I circumference ridge becomes ^, so the low-order (5th order, 5th order, 7th order...) non-reasonable phlegm becomes IYi# width and the distortion rate increases. In contrast, focusing on the low-order irrational harmonics, the filter is set up, the filter is changed to OSE, and the 7c judgment is lost when the O-force type τ beads are used. That's a long time ago.

The present invention eliminates the above-mentioned drawbacks of the conventional method, and is the next best thing to L.
Ideal ignition 11 obtained with! and the bias τ sinusoidally
F1!
Theory of 1-ton transistor and N [transistor interlock, but output '1' pressure hypothetical form 11 which goes low with t firing delay
The firing signal t for the valley transistor with less deviation from
``A student can do p w M ml groaning CVC
It is designed to provide an Ir system with iron equipment.

Below, parts corresponding to those in Figure 2 are given the same reference numerals and are marked lI4.
The present invention will be described in detail with reference to Fig. 5 (55A
and C55B) are transistors (5a), respectively.

Firing signal P for (5 and (6)5cbb>,
Ignition No. 1d generating Pla lb and P, , I B, , -
and the output 8 of the triangular wave generation circuit and oscillator, respectively.
2 and Belt received.

However, as shown in detail for (55A), the ignition signal generation 1gl path (65 muno and (55 phantom) has the same configuration, if you ask (55A), in the vJ6 diagram, the sine [k generation A sine tiL generation circuit that generates a sine waveform x2, an M2 technique reform generation circuit that generates a modification similar to sine modification x1 multiplied by bias t and t''lrL.
, both of which are designed to generate nine outputs in synchronization with the output 87 of the Kamei-kiri.

The output 810 of the sine tlL generator circuit 2 is compared with the output s2 of the triangular wave generator (b) in the first comparator 1, and the output 81 of the 2nd generation circuit 4) is compared to IW1.
1 is divided into 142 comparators 1-'i4 and compared with three liquid outputs Ig1 and one output B2. I41 and the second comparator (comparison outputs 812 and 815 of the UAND circuit and the NOR circuit) are given to the outputs of the ND circuit and the NOR circuit, which invert the trap pulse. It is designed to obtain the signals P□1 and P, τ.

The outputs of the thinking signal generation circuits (55 phantom AND circuit group and NO1 circuit field) are respectively transistors (5d
) and (5b), the ignition signals P, a, and P□5 are output from CC, and the output between the ignition note generation circuit C55B), υ, Igl, and NOR circuit is output from the transistor (6a). and ignition 1N- No. P2 for (6b)
and P8°.

The ignition number pseudoform obtained at /:s in Figure 5 is formed based on the following principle. Now, if we obtain an ideal output voltage τ of L shown in Figure 44 from the inverter (4), then 7'L (
In order to obtain this ideal output voltage, each transistor (5a
) to (6b), the ideal ignition signal waveforms shown in Fig. 4 D1 to D4 are 1 and 9, respectively.

The ideal output voltage for the 4th figure on the 1st and 5th sides is at the point t~t in the 12th area.
The molding changes in All, but these points are classified as 2-figure pots. The first match of fan 1 occurs at the time tze tgt when the shape changes in synchronization with the firing of the ru transistor.
”@ ety* tgt t-engineer corresponds to this.

For example, in the ninth layer t and the transistor (6b) before μ,
At this point, the transistor (5a)
When the ignition occurs, voltage is generated at the output of the switch 9.

-2 is synchronized with the extinction of the 4D transistor, and the output shaping changes at one time point 1. , 1. , 1. , 1.
.

t□. , t, corresponds to Koku.

If we look at the case from another point, we can see that the point at which the firing number 1B of the transistor connected to the X phase (5'L (5b) changes) is also □
.

t,, t,, t,, 1-1°, t □ and the firing 1 of the transistor (6aJt(6b)) connected to the Y phase.
No. 5-: Time point 1 when changes, 111.1. , 1. ,
1. , 1, and can also be divided into two.

This change in the output voltage waveform is caused by the positive and negative transistors being turned on and off. It can be seen that this occurs in the same layer when 10,000 transistors are turned on or turned off. Therefore, in synchronization with the on of the first transistor Q and the second transistor, the output signal ttj:, the a type is turned on. (Zt0゜, one house is 4: From D1 to D4, the output car '1 pressure 41J E) Ka correct (X < [r4 simply) QJ
411 vc i, back, transistor (5a,) I
(61)) is given (ri; d firing 100th τ).

If the transistor (sb)+(,'+a) is turned on quickly and extinguished by 'tn+=staggered firing/Ti-11r, L is satisfied. Output) R, tl'-f l>E 'H's 1 go is the opposite of 2.
') Comparing the VC sine wave (Xl) and the three AtRrR engineering τ, the hated m firing No. 18 812 (, 46 fig.
RI and (ratio & L-C(4ra rLru 1M No.5t5(,16
-82) A-build/λ1 should be generated for 6 guns, V, AIJD @ of both ministries, Fly) ignition 1 for Kunjista
No. 6 P, J recommendation 4 figure C1) is served, NOR'j is N
d) Point IA P work for transistor (-6 Figure 02
) is attended.

Here, the waveform x2 of H42 will be described. This V molding x2
It is obtained by applying a bias τ to the positive μ wave X1.

When the sine '0IX1 is positive, the bias is set to positive force, and when it is negative, # is set to negative force. In addition, the bias rod is μ-built, T-shaped, CCo time modification molding, Xl, and TRX and x2.
The deviation of the corresponding 2-claw darkness will not be one pair, but it will not be one-crop Doma Zhao, so let's make it 7 CC and 1 Hi according to the V rule.

1g-1811 (waveform X2 of figure #146 and triangular wave 1g No. 82 (waveform TR work of fan 6 figure)) with bias τ applied to the dot bias button regeneration 1 (55mm) in figure j145 If the bias force 811 is large due to the bias t shown in Figure B1, the bias force 811 is large.
A comparison output 812, which is a block "1", is obtained.

In addition, the sine axillary 1g No. 811 (forming X1 of the side 6 figure) and the triangular tiL signal (the 6th figure of the arrow) are compared by a comparator, and the sine IIL is shown in the work 9 shown in No. 1-B2.
When No. II 1310 is large a, a comparison output 815 which becomes "1" at one boundary is observed.

Therefore, as shown in Figure 6 C1, the comparison output 812 and B15 are ``1'' and lΦAND.
The lij force is applied and is output as the bias force P□1 at the point where the force S transistor Niri Vc is cut. 1 Noah 1u Tsumugi 1
From 411, as shown in FIG. 6 02, a MOR output is obtained in which the ratio outputs 812 and 815 are both FJd "0" and "1", and this is the ignition signal P1 for the transistor (5b). You can leave as one.

5th ignition No. 16 occurred at +1'J (55B)
V9 generates firing signals P, &'E2b2EfS for transistors (61 and (6b)).

? a However, the 6th L! ! JC1 and C2's Pil & Pil & P2b Figure 4 D1-D
4 is mentioned above and 71:j rise of the sea urchin pulse! The waveform is 7c, with the falling edge t being one step earlier, and the output r being obtained from the output/r inverter (4) having the 7c ideal 1-indentation shape τ as described above with reference to FIG.

2 In the above-mentioned example 211F11?11, it is applied to a transistor inverter with an unexplained τ fast phase. If it is an eye-excited type, it is convenient to use a switch element other than a transistor.

The above 1-uniangle example can be obtained by comparing the triangular tiLgi and the waveform bias force of Yuho 2 with a bias t applied to the sine tiL. hand 411
1 in 11 is unreasonable - 4 beast palace (it is possible to get the blade area pressure IjLY!fit with less swing, so τ filter V
-J61 small WVc and 4447 par-fiK44m I'b
*

[Brief explanation of drawings]

Figure 1 is a wire diagram showing the king of single-phase transistor CVCY inverter TGIW6, and Figure 2 is a conventional PWM.
1ii11 A block diagram showing the configuration of the cape, FIG. 6 is a diagram showing the details of the interlock circuit shown in FIG.
The PWM play based on uninvention in Figure 45 - the PWM play based on uninvention in the Q1d Kaw L shape diagram to make the production of the evil PWM lillii 1 front table? The block diagram shown in FIG. (1): Main (9) path t2): 1itt control circuit I8); Kutaki'K (IA (season: half-phase transistor inverter (5a) ~ (6b): ) transistor (7a) ~ (8
b): Diode (9): Reactor Shout: Capacitor (Remove: Load
uIIll: Drop pressure adjustment: Output Tortoise pressure Kaburaya 1-2 output゛Parking pressure controller example, (Kari: Sine wave Kosei Kaiyu, Jj: Triangle N brother's life w1 Both two brothers vibration--): Comparator -;: Distribution meeting (27a) ~ (28bJ: Interlock nra-:
Kaguen Ayu 4): Mu IJD Gate (55A), (
55B): Transistor ignition 1M No. % Ikuchiro t'l
*The 20th anti-memory student Kai Ayu I martyred, 轡: Comparator tfl: ANDt! 111% tl-phantom
:N0R1falJ16 agent S No Haku - JI Jl

Claims (1)

[Claims] +f flow A first comparison circuit that compares a sine wave signal with a triangular wave tgv in a pulse flow adjustment inverter that mainly operates 1g1tM by connecting a constant arm consisting of a pair of switch system elements between the positive and negative busbars. , apply bias t to the sine wave and compare the waveform signal with the triangular wave symbol #! The ratio of 2 is 1! Igl path and the outputs tsof'L-t of the fan 1 and second comparison circuits.
' has an IJDl path and a MOR circuit that receive the signals, and the outputs of the AND circuit and the N0RIIul path are connected to the main!
27NL: Giving ignition g1 to each of the pair of switch elements forming the D valley arm. r: Characteristic inverter! Ill decoration it.