JPS60229677A - Dc power source - Google Patents

Abstract

PURPOSE:To reduce a current ripple and to eliminate a stepup transformer by composing a regenerative power inverter of a self-extinguishing element and dividing the ON and OFF of the inverter when the regenerative current increases. CONSTITUTION:The AC side of a transistor power inverter 31 is connected through an AC reactor 32 with an AC power source 10 without using a stepup transformer. A DC voltage is detected by a voltage detector 18, input to a current reference generator 34, and when the DC voltage exceeds the prescribed value, a current reference is generated to instruct a regenerative current. The regenerative current of the inverter 31 is detected through an AC unit 33 and a current detector 36, compared with a current reference by a comparator 35, and its output signal is input to a distributor 38. The output of a phase detector 37 and the output of a level detector 20 are further input to the distributor 38, thereby outputting base input signals of the phases of the inverter 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a DC power supply device that rectifies an AC power source to supply DC power to a load and is capable of regenerating the DC power of the load into an AC power source.

[Technical background of the invention and its problems] An example of a conventional drip current power supply device capable of regeneration is shown in FIG.

In FIG. 1, an AC voltage e1 of an AC power supply 10 is converted into a DC voltage ed via a diode rectifier 1j and a smoothing capacitor 12, and is supplied to a load.

On the other hand, the surface current voltage ed#- is connected to the thyristor inverter 16 via the DC reactor 17, and its AC output is the secondary side voltage e2 of the step-up transformer 14 that boosts the AC power source e1. It is connected to the.

ili+' current voltage ed is detected by the voltage detector 18 and fed back to the phase control device 22 via the level detector 20, thereby controlling the phase of the inverter 16 to keep the DC voltage ed constant. .

The effective value of AC voltage e1 is converted to “DC voltage ed when phi is converted”
is Ed, then generally Ed= 1.35 Ep ------1111--(1
).

Also, let the DC voltage ed during regeneration be Ed', and the AC voltage e,
If the effective value of is E8, Ed'= 1.35 E8・House β −−−−−−−−−
--(It becomes 21.

Here, β is the firing control angle of the thyristor, and a β limit for commutation is provided, and 90°≦β≦150° (2 controlled).

During regeneration, capacitor 2 is charged by the regenerative energy from the load and the DC voltage ed rises to Ed') E(
1------------(It becomes 81.

Therefore, in order to perform regeneration stably, formulas (1) and (2) are used.
, (8+) is required to hold, and the AC side voltage eβ11 of the thyristor inverter 16 needs to be higher than the source voltage e1, so the step-up transformer 1411 cannot be omitted.

The voltage range of the DC voltage that can be regenerated according to the commutation conditions of the frozen silisk is limited by equation (2) and the β limit.

[Purpose of the Invention] According to the present invention, an inverter is constructed of self-extinguishing elements such as transistors, and by kneading) a step-up transformer on the raw power source side is not required, and the range of DC voltage that can be regenerated is expanded. The purpose of the present invention is to provide a compact, high-performance regenerative current power supply device.

[Summary of the Invention] The present invention provides a regenerative DC power supply device that converts AC power into DC via a diode rectifier and a smoothing capacitor, supplies the DC power to a load, and regenerates the load power to an AC m source via an inverter. In this method, the inverter is configured with a switching element that can self-extinguish, and the positive side element and the negative side element overlap the timing at which the switching element of the inverter turns on when the regenerative current exceeds a reference value. A distribution circuit is provided to control the regenerative current so as to reduce the ripple of the regenerative current, and (b) eliminate the need for a main step-up transformer.

[Embodiments of the invention] An embodiment of the present invention is shown in FIG.

In FIG. 2, for AC power supply, diode rectifier 1],
Smoothing capacitor 12. Pressure detection g%]8. The level detector 20Vi is the same as the conventional one shown in FIG.

However, the circles in Figure 2 indicate the conventional thyristor inverter 1.
6 is replaced by a transistor inverter 31, and its AC side is connected to an AC reactor 32 without using a step-up transformer.
It is directly connected to the firing current mixer 10 via.

The DC voltage ed is detected by the voltage detector 18 and input to the current reference generation circuit 34, and the current reference signal IB* given in FIG. 3 is output corresponding to the DC voltage ed. When □ is exceeded, * is generated from the current reference and regenerative current is commanded.

Phase detector 37Fi voltage of each phase of AC power supply 10 U, V
.

Input W to obtain the six-phase phase signal +US shown in Figure 4.
~-W8 is output.

Note that the phase signals 10US to -W8 are output with phases delayed by several degrees due to the influence of the built-in filters.

Regenerative current of transistor inverter 31 IBVi current transformer 3
3 and the current detector 36, and is compared with the current limit reference B9 by the comparator 5, and the output signal 40
(H1 frost η "1 in the limit range below the electric limit value") is input to the distributor 3δ.

The distributor 38 further includes an output 39 (+
U8 to -WS) and the output 21 of the level detector 20 (regenerative braking area e (1>H at edl) are also input, and thereby the base input signal of each phase of the transistor inverter 31 is output.

A detailed diagram of the circuit of the distributor 38 is shown in Figure 5.

In FIG. 5, the 6-phase phase signals 0US to -WS are divided into 60° portions via AND elements ANDl to AND3 and OR element OR1.
A 5°17 to t90 phase signal 41 is output.

The above phase signal 41 and a phase signal 42 which is obtained by inverting the polarity of this via an inverter INV are input to OR2 and OR3, respectively, and are ORed with the comparator output signal 40 (L in the current limit region). Output 4: (, is input to AND elements A, ND4, and AND5.

AND4. AND5 takes the AND of the signal 43.44 and the level detector output 20 (H in the regeneration range), and the output 45.46 is the +l-' S + +, respectively.
V S + + W S work-us, -vs, -
It is input together with ws to AND elements AND6 to ANDII, and the AND signal is output as a base signal to transistors +U to -W.

When the circuit of FIG. 5 is used as the distribution circuit 38 of FIG. 2,
During regeneration, when the regenerative cylinder and flow are below the physical distribution limit reference value, both the input signals 40 and 21 become H, so the AND4
．． The outputs 45 and 46 of AND5 both become H, and the transistors +U~- correspond to the 6-phase phase signal 〇S~-WS.
W is sequentially given pace input and power regeneration is performed.

When the regenerative current In increases during regeneration and exceeds the current reference IB*, the output 40 of the comparator 35 becomes L, and in this case, the fifth
In the figure, the output 41 of OR2, OR3#'1tOJ and the output 42 of INV alternately become H at every 60°, and are connected to AND5 via AND4 and AND5, respectively.
～A N D 8 and AND9～ANDII alternately H
ni, this ni, l niche) rough') star + Ll, +
V, +Wt-(J, -V.

-W is alternately turned off in 60' increments to limit the current.

In this case, as shown in FIG.
Since the elements on one side and the elements on one side are turned on and off alternately, ripples in the regenerative current are reduced.

Further, in the circuit shown in FIG. 2, since regeneration can be performed from the transistor inverter 31 to the direct AC source 10 via the AC reactor 32, there is no need for a step-up transformer as in the prior art.

Although a transistor element is used as the h-pi implementation 911 inverse converter, it is also possible to use a GTO or other element capable of self-extinguishing b1.

[Effects of the Invention] As described above, according to the present invention, in a regenerative DC power supply device, the first regeneration inverter can be made of a self-extinguishing element such as a transistor, and the regenerative current can be When the size increases, the regenerative inverter is turned on and off separately, which reduces current ripple and eliminates the need for a step-up transformer, resulting in a DC power supply that is advantageous in terms of reliability and cost-effectiveness. realizable.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an example of a conventional regenerative DC type source device, Fig. 2 is a 161 line diagram showing an embodiment of the present invention, Fig. 3 is a diagram showing the characteristics of the regenerative current reference, 4 is a waveform diagram showing the operation of the phase detection circuit 37 in FIG. 2, and FIG. 5 is a circuit diagram showing details of the distribution circuit in FIG. 2. 10... AC power supply 11... Diode rectifier 12
... Smoothing capacitor 14 ... Step-up transformer 16.
... Thyristor inverse converter 17 ... DC reactor 18 ... Voltage detector 20
... Level detector 22 ... Phase control device 31 ...
- Transistor inverse converter 32...AC reactor 34...Current reference generation circuit 35...Comparator 3b...Current detector 37...
Phase detector 38... Distribution circuit agent Patent attorney rules
Kensuke Chika (and 1 other person) Figure 1 Figure 3 Figure '4

Claims (1)

[Claims] In a regenerative DC power supply device that converts AC power into DC via a diode rectifier and a smoothing capacitor and supplies the DC power to a load, and also regenerates the load power to the AC power via an inverter, the inverter is self-extinguished. 5. The power supply device is configured with a switching element that can be turned on, and the timing at which the switching element of the inverter is turned on when the regenerative current exceeds a reference value.