JPS58179180A - Power regenerative controller - Google Patents

Abstract

PURPOSE:To perform the regenerative control of a power factor 1 by recovering a DC power source to an AC power source via a bridge circuit having an electric valve and a diode. CONSTITUTION:An arm which is composed of a diode connected in anti-parallel to an electric valve through a reactor 8 from an AC power source 1 is connected to an AC terminal of a transistor bridge 9 connected in 3-phase bridge manner. A smoothing capacitor 5 is connected to the DC side of the bridge 9, a current detector 10 is connected between the capacitor 5 and the DC side of the bridge 9 for detecting the regenerative current to the power source 1. The electric valve of the bridge 9 is controlled by chopper at a control angle alpha=180 deg. (beta=0 deg.) by detecting the phase from the power source 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a device for controlling magnetic regeneration from a power source to an alternating current power source.

[Background technology of the invention]

lI style I! Systems are widely used in which a chopper circuit converts direct light to bipartite solder pressure to operate a tI current motor, and an inverter circuit converts DC voltage to AC voltage to operate a current transformer motor. ing. In some cases, if the electric power IhFIA operating in these systems is controlled to slow down, the rounding DC voltage at which the regenerated energy is returned to the DC voltage increases, and all of this regenerated power must be further regenerated into the AC power supply. .

An example of conventional 1-branch surgery is shown in Fig. 1. In Figure 1,
, town f[i'
It creates a DC power supply smoothed by a reactor 4 and a capacitor 5. From this DC power supply, a chopper circuit 6 (transistor bridge in this example)
The configuration is such that the AC electric exciter 7 is driven by converting the AC power into parallel outputs. In such a configuration, when the AC motor is decelerated by reducing the frequency of the AC supplied to the AC motor 7, the rotational energy of the AC TIL motor 1 is regenerated into the DC power supply, increasing the voltage of the capacitor 5. This voltage rise is detected, and the thyristor bridge 2 is cut off and the thyristor bridge 3 is turned on, thereby generating a regenerative current to the current transformer tt source 1 and lowering the voltage of the capacitor 5.

This regeneration method is a basic method of thyristor Leonard, and is a well-known technology that is widely used.

However, in the case of this method, the power factor is poor for both the current flowing from the AC power supply 1 and the regenerated current, which performs voltage control by phase control of the thyristor bridge, and even with an optimal design, the power factor is 0.7 to 0.8. There is a drawback that the degree is the limit.

In the future energy saving era, it is considered important that the power factor on the power source side is close to 1, so it is desirable to control an AC-DC converter in which the power factor is close to 1 for both the inflow and outflow of current from the n1 father current power source. In particular, power regeneration control that provides a high power factor during power regeneration is desired.

[Purpose of the invention]

The present invention has been made in consideration of the points noted above and has a force of 4A.
This is an attempt to provide a device IT that can perform a regeneration system @ 1 time.

[Summary of the invention]

For this purpose, in the invention, a bridge circuit is constructed in which several arms each having an electric valve and a diode connected in antiparallel are used to regenerate from a DC power supply to an AC source, and a phase By detecting this, the electric valve is chopper-controlled at approximately a control angle α=180° (β=09).

[Implementation sequence of the invention]

An embodiment of the present invention will be described below with reference to FIG. Components in the figure that are the same as those in FIG. 1 are given the same numbers.

It consists of an electric valve (in this implementation series, a transistor, hereinafter referred to as a transistor) and a diode connected in reverse parallel to the reactor 8 (this can also be done by using the inductance of the AC power source 1) from the AC power source 1. The arm is connected to an AC terminal of a transistor bridge 9 connected in a three-phase bridge.

[15! of transistor bridge 9! A smoothing capacitor 5 is connected to the terminal, and a current detection terminal 6t is connected between the capacitor 5 and one terminal on the DC side of the transistor bridge 9.

'51: Detect the regenerative current to the flow source 1.

The capacitor rolling pressure on the DC side is detected by the voltage detector 11, and compared with the reference voltage 12 (fixed voltage or OT transformer may be used). It outputs the regenerative current reference IR, compares it with the regenerative current iId detected by the -current detector 1O, and outputs the chopper signal VQH by means of the -614 stage, which has hysteresis in its input/output characteristics. This chopper signal VOH is distributed to each transistor by AND circuits 30 to 35 so that the regenerative first flow of force 41 flows, and the drive circuits 40 to 45 distribute the chopper signal f to each transistor 9U, 9V, and 9W of transistor bridge 9.

9X, (IY, 9Zi drive.

A resistor 22 is connected to the direct i side of the diode bridge 21 for detecting the phase when all transistors are driven, and a photocoupler 20U is connected to the alternating current side for detecting the variable current phase.
, 20, 20', 20Y, 201, and 20z are connected to four AC sources 1 via light emitting diode sections. The transistor side of the photocoupler uses the auxiliary source 23 as a power source, and the photocoupler 20U, 20X, 20V, 20Y, 20W as a resistor, 25.26.27.28.29 full load.
, 20Z are connected, and the phase outputs f'U, Px,
Obtain pv, py, FW, pz.

The logic difference between the regeneration flow control output VOH and the above phase output is taken by the AND circuit 1@30.31.32.33.34.35, and the transistors of the transistor bridge 9 are driven by the drive circuits 40 to 45, respectively. do.

Note that the rectifier 15 detects only the polarity of the regenerative current, the overcurrent is detected by the level detector 16, and the output d of ``Am'' and the Sakuide itO is maintained by the AND circuits 30 to 3.
5 is input as the condition, and when an excessive current occurs, the AND condition is not satisfied, all transistors are turned off, and an operation is performed to analyze the failure during regeneration.

Next, the operation will be explained with reference to FIG. 3 and sg4.

First, a phase detection circuit that determines the ON period of the transistor of the transistor bridge 9 for flowing a regenerative current with a power factor of 1 will be explained with reference to FIG.

Input current iR,is of diode bridge 21.

Figure 3 shows the line voltage e1 and phase voltage ep of the IT and AC power supplies. becomes. Therefore, in Fig. 2, this input current iR,
i51, i Tl photocoupler 20U, 20K,
207.20Y, 20f, 20Z, and is insulated as the output lightning of the photocoupler's light-receiving transistor, and the phase voltages P'U, PX, P7゜px, pw,
I'm getting pz. Needless to say, this phase voltage has a power factor of 1
There is a phase relationship of converter energization, and the transistor bridge 9 is connected to a! with a phase of 180 degrees from this. By doing so, a regenerative current with a power factor of 1 can be caused to flow. In other words, during the phase period (between & and b) in which IR is flowing, the transistor arm 9
Regeneration is performed by turning on V and flowing a current with the opposite phase to 1R. In order to put into practical use the regenerative control of the power 41, it is necessary to chopper control the transistor arm at the above pH phase and then control the current 1st shift, and in Fig. 82, the voltage V6 of the capacitor 5 should be It is necessary that the electromotive force of the source l be higher than that of the source l.

The manner in which the regenerative current increases by .t+lJ when the chopper I is 1# will be explained with reference to FIG.

Now, the voltage V (1) of the capacitor 5 has become higher than the three-phase fully reverse electromotive force 'OjDMF of the AC power supply l as shown in the figure. , when the regenerative current reference IR is output, the chopper signal VOH outputs 11'', and the AND circuits 30 to 35
Transistor arm tP to achieve regeneration with a good deer rate of 1
] i! ! and switch the transistor arm. That is, at time, transistor arms 91J and 9z are turned on. Then, the regenerative current I (l increases, and the work R = work d
Therefore, the chopper (# VcH becomes "0" and the transistor arm 9U.

9z is turned off and the process d decreases. ΔId shown in the figure is platform 1
With a hysteresis width of 11g114, the regenerative current is IR and Δ
Chopper control is performed to fit within the width of I(l).

The regenerative current is controlled by repeating such a chopper operation. This operation is performed using transistor arm 9U, 9V, 9W.
, the on/off signal for 9Z #D9U, D9V
, D9W, and D9Z, the regenerative currents flowing to the R-phase current source at this time are shown in Fig. 4. As shown in the figure, it is possible to flow a regenerative current with a phase of power factor 1.

5 shows another example of the phase detection circuit for the power factor l shown in FIG. 2. Reactors 80R, 80B, 80T1 Capacitors 81R, 81S, 81T are high frequency filters that are used when waveform distortion becomes large, and 7T for phase detection.
Tocapura 20U, 207.201% 20X, 20M.

20W and 20z are connected directly to the diode arm of the diode bridge 21, but the operation is exactly the same.The photo coupler used for these can be replaced by an insulated current detection device.

Furthermore, in Fig. 6, the AC current is insulated by a transformer condenser 82, a three-phase half-height rectifier circuit is constructed by diodes 83U, 837, and 83W, and flows through a resistor 85 as a load.
It is detected by the resistors 84U, 84V, 84W and amplified by the phase voltage PTJJPV by 1FJ86U, 86'i, 86W.

PvI'fr: Detect. Note that an example is shown in which the amplifier 86U is configured by a transistor 89, a resistor 88, and an auxiliary g source 81.

The configuration shown in Figure 6 can also be modified as shown in Figure 1. In Figure 1, 83U, 83V, 83W
, 83, 83Y, 83Z are diodes, 85a.

85b is a load resistor, 84U, 84V, 84W is a current detection resistor, the direct current f flowing through this resistor, the amplifier 86U
.

867, 86 W, 86 X, 86 Y, 86
Amplify with Z to obtain phase magnetic pressure j'Tl, E'! , 91.
PX, )Y, and PZf are output respectively. 87a, 8γb
I am 44I171 Kamegen of Masu 1 @ vessel.

Furthermore, what is shown in FIG. 8 is a modification of the one shown in FIG.
Current flowing through 83Z Full photocoupler 20U, 20V,
20W.

20Z, , 20Y, and 20Z are connected to the light emitting diode sections for detection, and the operation is exactly the same.

Furthermore, the 'IE4 detection 4510 shown in FIG. 2 detects all of the current on the intercurrent side using current transformers 50a and 50b as shown in FIG. 9, and uses the output rectified by the rectifier 51 as DC feedback I. It's also possible.

Further, a modification of FIG. 2 is shown in FIG. 9. In FIG. 9, other parts are completely the same as those in FIG. 2, and therefore are omitted. Chopper signal 70H: Counted down by i flip-flop 53, detects that -10,000 current reference IR has been inputted by all logic level converter 52, and converts this 752 and the tl'OH to flip 70 by switching circuits 54 and 55.
Switched by knob output 53, output V54, V55'? :
The switching frequency is set to about i by alternately turning off the arms of the transistor bridge 9, which are also energized, by outputting the respective outputs and distributing them into phases with a power factor l using AND circuits 30 to 35 similar to those shown in FIG. , reducing switching losses. At the same time, configure the reflux mode and
Decrease the rate of change of Ka to reduce m: noise to the source. This will be explained later in FIG. 1θ.

Note that the current flow is detected by the level detector 16, and by ANDing with VB2 by the AND circuit 56, an excessive current during regeneration is detected, and by the output held by the holding circuit 17, the transistor bridge 9 0 to turn off all
The reason for detecting only roundworms is the capacitor 5 shown in Figure 2.
Therefore, a large current may flow in the forward conversion current due to intercurrent or quasi-variation of the source, etc., and since this current is uncontrolled, only the single-tooth current during regeneration is detected and the transistor bridge is Protect 9.

Figure 10 shows the output voltage of each configuration in Figure 9.
The ``1'' n of the 3rd grade corresponds to the sign of the yoke in FIG.

Detects that the standard IR is input, and v52 is @1
'', and the chopper issue VOH is flip-flop 53
The frequency of output V53tflf11 becomes 1, and the switching circuit 54.55 switches between VB2 and 70H to obtain outputs that alternately turn on and off like outputs V54 and V55, and F transistor arm drive signals V36 and VB2. ,
The transistor bridge 9 is turned on and off by obtaining output signals such as V32 and VB2.

For example, time 1. ~ Jin, Tsukasa, transistor 9Y 7
32, turns on from 9 W f V 35i/ζ,
t.

The transistor 9Y remains off and the transistor 9W remains on during the period of ~tsr! At time 1, the transistor 9Y turns on again, and 9Wt/i remains on. ~nothing.

During this period, transistor 9Y remains on and transistor 9W turns off. Increasing the regenerative current is achieved by turning on two sets of transistors, and when one transistor is off, the system is in freewheeling mode. That is, in FIG. 2, for example, 9
When Y and 9W are turned on, the regenerative current flows in the direction of the arrow Id through the circuit of transistor 9W → reactor 8 → AC power supply 1 → transistor 9Y, and when only transistor 9Y is turned off, this current flows through the 9V diode and through transistor 9Wi. In this mode, the tfL variation force is lower than when 9Y and 9W"ft are turned off at the same time, and the surge voltage is reduced.Furthermore, since the transistors are turned on and off alternately, the switching frequency is approximately 11, and the switching loss is approximately i. becomes.

Furthermore, it is also possible to apply the well-known pwM control m by comparison with a triangular wave as shown in FIG. 11 to the chopper control method shown in FIG. It was shown to. FIG. 12 is an explanatory diagram of the operation.

The current reference 1'R and the regenerative current Id are compared and amplified by an amplifier 60, and the output cuff 60 and the modulating triangular wave generator 62
A comparator 61 compares the output of
, PV% FW, and transistor arms 9U, 9V, and 9Wf are driven.

- The reference signal IR is detected by the level detector 52, and the phase voltages PX, PY, j'Z and the AND circuit are used to obtain the transistor drive ID signals 9X%9Y, 9z. In this way, similar control is possible by leaving the rectangular arms of the transistor bridge 9, which are energized at the same time, on during regeneration and performing chopper control on only the other transistor arm. Any method can be applied to turn on and off two sets of transistors at the same time, turn them on and off alternately, or turn on and off only 1,000 transistors.

〔Effect of the invention〕

As explained above, according to the present invention, regenerating regenerative power with a power factor of 1 to the power source provides OJ dQ. Phase detection at a power factor of 1 is performed by the rising phase of the current flowing through the diode bridge, l! According to this embodiment, it is possible to detect the regenerative phase with a power factor of 1 without being affected by the number of cycles of the power supply, molding distortion, or phase rotation. Furthermore, in the case of an embodiment in which the regeneration transistor arm is turned on and off alternately, the switching loss of the transistor is reduced and the conversion efficiency is improved, and the efficiency is further increased by keeping all transistors off except during regeneration. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the prior art, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIGS. 3 and 4 are diagrams explaining its operation.
FIG. 5, FIG. 6, FIG. 1, FIG. 8, FIG. 9, and FIG. 11 are circuit diagrams showing other embodiments of the present invention, and FIG. 10 and FIG. 12 are operation explanatory diagrams. 1... AC power supply, 2.3... Thyristor bridge,
4...Reactor, 5...Capacitor, 6...Chopper circuit, 1...AC motor, 8...Reactor, 9...Transistor bridge, 10...Current structure device1. n...Voltage detection a, 13.14...Amplifier,
20...Photocoupler, 3o131.32.33.3
4.35...AND circuit, 40.41.42.43.
44.45... Drive circuit, 21... Diode bridge, 52... V bell detector, 53... Flip-flop, 54.55... Changeover switch, 60... Amplifier, 61...・Comparator, 62...Triangle anti-generator, 8
2...Trance. Application Yashiro” person Inomata Kiyomi 3 o’clock RS RT ST SRTRTS also 4
Figure d eCEMF /-\-Me\/-\-11, 7-57
--, also 5 Figure 1 Horse 6 (To) b 7 Figure 58 Closed flood 9 Figure 1O TZ T't Tt)

Claims (1)

[Scope of Claims] 1. A bridge circuit that combines a plurality of arms in which electric valves and diodes are connected in antiparallel to regenerate from a DC power supply to a direct current source, and detecting the phase from the AC m source. A power regeneration control device comprising: a device for controlling the electric valve at a control angle α=180° (β=Ot+). The power regeneration control device according to claim 1, comprising a device for detecting the input xi of the Z diode bridge (5) and detecting the phase of β209. 3. The chopper and the ItO control device are DC Claim 1: The electric valve is controlled by 91M by comparing the power supply voltage and the reference voltage, increasing and decreasing the voltage, and using it as a current reference, and comparing it with the regenerative current detected from the direct current measurement or the alternator ridge source side. The single-force regeneration system described in Section 1.