JPH0528070B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a power supply device, and more particularly to a power supply device that can be used for equipment such as a laser oscillator that requires switching of the power supply between continuous mode and pulse mode. .

[Technical background of the invention and its problems] In general, the specifications of the power supply for a CO ₂ gas laser oscillator are (1) DC that matches the voltage (1000 V or more) and current of the target laser discharge part in continuous mode; (2) The pulse mode is one in which the voltage and current in the continuous mode are intermittent in a pulsed manner, and two modes are required: a frequency of 200-1 kHz and a duty ratio of 10-50%. Further, as shown in FIG. 12, it is desirable that the peak voltage and peak current in the pulse mode are larger than in the continuous mode so that the average power in the continuous mode and the pulse mode are equal. (Enhanced Pulse Mode) In order to satisfy such specifications, there has been a power supply device using a high frequency converter as one method. As shown in FIG. 13, this power supply device converts a commercial power source 1 into direct current through a variable voltage rectifier circuit 3 and a smoothing circuit 5, and connects the DC power to a switching circuit 7. The carrier signal is switched at the frequency and applied to the output transformer 9, and after being boosted in the output transformer 9, the carrier signal is smoothed and rectified by the rectifying and smoothing circuit 11, and is output as a pulsating DC power source. The switching signal in the switching circuit 7 is such that the carrier signal from the carrier generator 13 is superimposed on the pulse pattern from the pulse pattern generator 15 at the carrier gate 17, and the resulting signal is applied to the switching circuit 7.

However, in the case of a circuit configuration centered around such a high-frequency converter, the configuration becomes complicated and
Another problem was that the high-frequency components were expensive, and in order to realize the enhanced pulse mode, the power capacity of the components had to be increased.

In addition, conventionally, as another configuration of the power supply device, the 14th
As shown in the figure, the commercial power supply 1 is connected to the AC variable voltage device 1.
After changing the voltage at step 9 and boosting the voltage using a step-up transformer, it is converted to direct current at a rectifying and smoothing circuit 23 and applied to a switching circuit 25.
It is also possible to consider a configuration in which the power is switched according to the pulse pattern given by 7 and output as a pulsating DC power supply, but in this case, switching would be difficult due to the high voltage, and the step-up transformer would be large for commercial use. There is a problem that has arisen.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems in the prior art, and it is possible to use a small transformer and to change the duty ratio of a switching circuit in both continuous mode and enhanced pulse mode. The purpose of the present invention is to provide a power supply device that can output power without any problems.

[Summary of the Invention] In order to achieve the above object, the present invention includes N pulse amplifying sections (N≧2) connected in parallel; each pulse amplifying section has a duty ratio of 1/N or more in continuous mode. a pulse generator that provides input pulses with a duty ratio of 1/N or less in pulse mode; shifts the phase of each input pulse to be applied to each pulse amplification section in continuous mode; a phase control unit that controls the phase of the input pulse signal input to each of the pulse amplification units so that the phases of each input pulse applied to the amplification unit are in the same phase; and a phase control unit that controls the phase of the input pulse signal input to each of the pulse amplification units, and a frequency extremely higher than the pulse frequency of the pulse generator. a carrier generator that generates a carrier; and a carrier gate that superimposes the carrier on an input pulse inputted from the pulse generator to each of the pulse amplification sections, and each of the pulse amplification sections includes a pulse amplifier and a carrier gate. Each of them is equipped with a rectifier circuit, and a smoothing circuit is shared.

[Embodiment of the Invention] FIG. 1 shows an embodiment of the present invention, and is an embodiment in which the pulse amplification section has two systems (N=2). The commercial AC power source 31 is rectified and smoothed by the rectifying and smoothing circuit 33 to become a DC power source, which is input to the first pulse amplifying section 35 and the second pulse amplifying section 37 .
An input pulse signal having a constant pulse pattern is directly supplied from the pulse generator 39 to one first pulse amplifying section 35, and the other second pulse amplifying section 3
7 is provided with an input pulse signal via a phase control section 41. The outputs of the first and second pulse amplifying sections 35 and 37 are superimposed to form one DC output.

FIG. 2 shows a specific circuit configuration of the power supply device of the above embodiment, and the rectifying and smoothing circuit 33 includes rectifying diodes D ₁ -D ₆ , a freewheeling diode D ₇ , a smoothing coil L, and a capacitor C. It is composed of. The commercial power source 31 is then rectified and smoothed to become a DC power source, which is input to a first pulse amplification section 35 and a second pulse amplification section 37 connected in parallel. The first pulse amplifying section 35 and the second pulse amplifying section 37 have the same circuit configuration, and each constitutes a so-called bridge type amplifier by transistors Q ₁₁ -Q ₁₄ ;Q ₂₁ -Q ₂₄ as switching elements. are doing. Each transistor Q ₁₁ and Q ₁₄ is driven by an input pulse signal P ₁₁ , and both transistors Q ₁₂ and Q ₁₃ are driven by an input pulse signal P ₁₂ . Similarly, the transistors Q ₂₁ and Q ₂₄ of the second pulse amplification section 37 receive the input pulse signal.
Driven by P ₂₁ and transistor Q ₂₂ ,
Q ₂₃ is adapted to be driven by input pulse signal P ₂₂ .

The output of this switching circuit is an output transformer.
The voltage is boosted by T ₁ and T ₂ and rectified by rectifier diodes D ₁₁ -D ₁₄ ; D ₂₁ -D ₂₄ and output.

Next, the operation of the power supply device having the above configuration will be explained. For convenience of explanation, only the relationship between the input pulse signal applied to one of the first pulse amplifying sections 35 shown in FIG. 2 and the rectified output is shown in FIG. The input pulses P ₁₁ and P ₁₂ are 180° out of phase, and the pair of transistors Q ₁₁ and Q ₁₄ and the transistor
The pulse frequency is set to turn on the set of Q ₁₂ and Q ₁₃ alternately. Furthermore, a dead time Td is set for both pulse signals P ₁₁ and P ₁₂ to prevent both sets of transistors from being turned on at the same time. By alternately turning on and off this switching circuit, positive and negative outputs are alternately obtained from the transformer _T1 . The output from this transformer T ₁ is rectified by rectifying diodes D ₁₁ -D ₁₄ to obtain a rectified output as a pulsating current.

In the above explanation, the operation of the first pulse amplification section 35 was shown, but the same operation can be obtained by the second pulse amplification section 37, and the input pulse signal P ₂₁ ,
With the input of P ₂₂ , the transistor set Q ₂₁ ,
Q ₂₄ ; Q ₂₂ and Q ₂₃ are turned on and off alternately, and the output transformer T ₂ obtains alternating positive and negative outputs, and a pulsating output is obtained as a rectified output.

The above input pulse signals P ₁₁ , P ₁₂ , P ₂₁ , P ₂₂ are the first
The input pulse signal P ₂₁ to the second pulse amplification section 37 is based on the pulse pattern given by the pulse generator 39 shown in the figure.
_P22 is controlled by the phase control section 41 to delay the phase by a certain angle. The aspect of this phase control will be explained based on FIGS. 4 and 5.

(A) Continuous mode First pulse amplification section 35, second pulse amplification section 3
The input pulse signals of No. 7 are 180° out of phase, and the duty ratio is 1/2 or more (i.e., 50
% or more) and make the combined output a continuous DC output. FIG. 4 shows the output pulse state in this continuous mode. The output pulses of the first pulse amplifying section 35 and the second pulse amplifying section 37 are out of phase.
They are shifted by 180°, and their duty ratios are both 50.
It is expressed as a percentage. Therefore, the combined output is a continuous output at a constant level, which is a superposition of both.

(B) Enhanced pulse mode First pulse amplification section 35 and second pulse amplification section 3
When controlling the phase control circuit 41 so that the input pulse signals P ₁₁ , P ₂₁ and the input pulse signals P ₁₂ , P ₂₂ with respect to 7 have the same phase and the same duty ratio, the pulse amplifiers 35 and 37 The output pulse is as shown in FIG. In other words, the output pulses have the same phase and the same duty ratio, and the combined output is a superposition of both output pulses, and its peak output power is the sum of both systems. However, the average output power is the same as in continuous mode.

In this way, phase control is performed on the input pulse signal from the pulse generator 39 shown in FIGS. 1 and 2, and the first and second pulse amplifiers 35, 37
By controlling the phase of the input pulse signal, both continuous mode and enhanced pulse mode output modes can be obtained. Note that in the above embodiment, N=2 was set, the first pulse amplifying section and the second pulse amplifying section were used, and the duty ratio of each output pulse was 50%, but the value of N is 2.
It can take the above appropriate values,
An embodiment in which N=3 is shown in FIGS. 6 to 8. In this case, in addition to the first and second pulse amplifying sections shown in FIG. 2, a third pulse amplifying section is connected in parallel, and as shown in FIG. 6, 1/N, that is, 1/3 (=33%). Therefore, 1
System capacity is peak output 1Amax, average output
It is set to 0.333Amax.

Then, as shown in Fig. 7, the first, second, and third
If the output pulses of the pulse amplification section are set to have a phase shift of 120°, the overall combined output will be
A continuous output of 1A can be obtained.

Furthermore, if the phases of the output pulses of each system are matched as shown in FIG. 8, an enhanced pulse output with a combined output of 3 A at the peak and an average output of 1 A can be obtained.

9 and 10 show an embodiment in which a carrier modulation type pulse amplification section is used as the pulse amplification section instead of the direct amplification type of the above embodiment. In other words, it is a system that amplifies the DC input using a carrier with a frequency that is gradually higher than the pulse frequency, and has the advantage that the step-up transformer can be made smaller because the handled frequency is high.

In the configuration of a power supply device using this carrier modulation type pulse amplifier, first, carriers from a carrier generation section 43 are sent to pulse gates 45A and 45B, respectively. The pulse from the pulse generator 47 is sent to the pulse gate 45A and the pulse gate 45B with its phase changed by the phase controller 65. In the pulse gates 45A and 45B, the carrier pulse signal is superimposed on a fixed pattern of pulses, and the carrier pulse signal is inputted to each of N (in this embodiment, N=2) pulse amplifiers 49 and 51 installed in parallel. .

In each pulse amplifier 49, 51, the DC input is pulsed by this input pulse signal, and is applied to a rectifier 53, 55 as an amplified output pulse.
The rectifiers 53 and 55 rectify the output pulses and provide them to smoothing circuits 57 and 59, where the carrier signal is removed and output as a DC pulse output.

In this way, the pulse outputs output from the smoothing circuits 57 and 59 are combined and taken out from the output terminal as a continuous mode or enhanced pulse mode output.

The amplifier 49, rectifier circuit 53, smoothing circuit 57
constitutes a first pulse amplification section 61, and the other amplifier 51, rectifier circuit 55, and smoothing circuit 59 constitute a second pulse amplification section 63. The phase of the input pulse signal to the second pulse amplification section 63 is controlled by the phase control section 65, and the combined output can be switched to continuous mode or enhanced pulse mode by controlling the phase of the input pulse signal.

FIG. 10 shows a specific circuit configuration of the pulse amplifying sections 61 and 63 in the embodiment shown in FIG. 9 above. The pulse amplifiers 49, 51 are configured as bridge type amplifiers by four transistors Q ₃₁ -Q ₃₄ . Of these transistors, Q ₃₁ and Q ₃₄ are given the same pulse input signal and turned on and off at the same time, and the other transistors Q ₃₂ and Q ₃₃ are 180° out of phase. Input pulse signals are applied simultaneously to control on and off. In this way, alternating forward and reverse pulse outputs are given to the output transformer _T10 . On the secondary side of this output transformer _T10 , there is a rectifier circuit 53 composed of diodes _D31 - _D34 ,
55 is connected, and further coil L ₁₀ and capacitor
The carrier signal is removed and smoothed by smoothing circuits 57 and 59 composed of _C10 to obtain an amplified pulse output. In addition, in the case of this embodiment, diodes are further provided in the smoothing circuits 57 and 59.
D ₁₀ and D ₁₀ are provided, and the first pulse amplification section 61 and the second
An OR circuit is configured so that the pulse outputs of the pulse amplifying section 63 can be taken out alternately, and the output pulses of the other system are not input to the smoothing circuits 57 and 59.

In this embodiment, each pulse amplifier 49,5
The DC power (not shown) given to 1 is taken out as a pulse output, and by controlling the phase of the input pulse signal of the first pulse amplification section 61 and the second pulse amplification section 63, the output of continuous mode and enhanced pulse mode is output. You can get it.

FIG. 11 shows another embodiment including a carrier modulation type pulse amplification section. In the case of this embodiment, the smoothing circuits 57 and 59 in the embodiment shown in FIG.
The rectified output of the rectifier circuit 55 of the pulse amplifying section 63 is inputted together to one smoothing circuit 57, and the carrier included in the rectified output is removed by the one smoothing circuit 57 to obtain a pulse output. This is what I did. In the case of the embodiment shown in FIG. 11, the pulse amplifiers 49 and 51 are connected to the 10th
It has the same configuration as the embodiment shown in the figure, and only the secondary side circuit is clearly shown. In a power supply device using a carrier modulation type pulse amplification section having such a configuration, diodes D ₁₀ , which constitute an OR circuit,
In addition to being able to eliminate _D10 , one smoothing circuit can also be used in common, which has the advantage of further simplifying the circuit.

[Effects of the Invention] As can be understood from the above description of the embodiments, the present invention basically consists of N (N≧2) pulse amplifying sections 61 and 63 connected in parallel; , 63, a pulse generator 47 which supplies input pulses with a duty ratio of 1/N or more in continuous mode, and input pulses with a duty ratio of 1/N or less in pulse mode; An input pulse signal input to each of the pulse amplification units 61, 63 by shifting the phase of each input pulse to be applied so that the phase of each input pulse applied to each of the pulse amplification units 61, 63 is in the same phase in the pulse mode. a carrier generator 43 that generates a carrier with a frequency much higher than the pulse frequency of the pulse generator 47; and a carrier generator 43 that controls the phase of the pulse generator 47;
3, each of the pulse amplifying sections 61, 63 includes a pulse amplifier 49, 51 and a rectifier circuit 53, 55, respectively, and The smoothing circuit 57 is used in common.

As is clear from the above configuration, in the present invention, the pulse generator 47 changes the duty ratio of the input pulse given to each pulse amplifying section 61, 63 in continuous mode and pulse mode, and also changes the duty ratio of the input pulse given to each pulse amplifying section 61, 63. The section 65 shifts the phase of each input pulse given to each pulse amplification section 61, 63 in the continuous mode, and controls the input pulses so that they have the same phase in the pulse mode.

Therefore, in the present invention, the combined output of the pulse amplifying sections 35 and 37 connected in parallel can be obtained as a continuous output or a pulse output.

Further, in the present invention, the pulse generator 4
Since the configuration is such that a high-frequency carrier generated from the carrier generator 43 is superimposed on the input pulse inputted from 7 to each pulse amplification section 61, 63,
This allows the step-up transformers of the pulse amplifiers 49 and 51 in each pulse amplification section 61 and 63 to be miniaturized.

Furthermore, since the pulse amplifying sections 61 and 63 share the smoothing circuit 57, the circuit configuration becomes simpler.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an embodiment of the present invention, FIG. 2 is a specific circuit diagram of the same embodiment, and FIG.
FIGS. 6 to 5 are time charts showing the operation of the above embodiment, FIGS. 6 to 8 are time charts showing the operation of the embodiment having three pulse amplification sections, and FIG.
The figure is a circuit block diagram of an embodiment using a carrier modulation method in the pulse amplification section, FIG. 10 is a specific circuit diagram of the pulse amplification section of the same embodiment as above, and FIG. 11 is a circuit diagram using a carrier modulation type pulse amplification section. A circuit diagram showing another example of the embodiment, FIG. 12 is a graph showing a comparison between a continuous mode and an enhanced pulse mode as a laser power source, and FIGS. 13 and 14 are circuit block diagrams of conventional examples, respectively. 31... Commercial AC power supply, 33... Rectifying and smoothing circuit, 35... First pulse amplifying section, 37... Second pulse amplifying section, 39... Pulse generating section, 41... Phase control section, 43... Carrier Generator, 45... Pulse gate, 47... Pulse generator, 49, 51
... Pulse amplifier, 53, 55 ... Rectifier circuit, 5
7, 59...Smoothing circuit, 61...First pulse amplification section, 63...Second pulse amplification section.

Claims (1)

[Claims] 1 N pieces (N≧2) of pulse amplifying units 61, 63 connected in parallel; each of these pulse amplifying units 61, 6
3, a pulse generator 4 which provides an input pulse with a duty ratio of 1/N or more in continuous mode and an input pulse with a duty ratio of 1/N or less in pulse mode.
and 7; in the continuous mode, the phases of the input pulses applied to the pulse amplification units 61 and 63 are shifted, and in the pulse mode, the phases of the input pulses applied to the pulse amplification units 61 and 63 are in the same phase. a phase control section 65 that controls the phase of the input pulse signal input to each of the pulse amplification sections 61 and 63, and a carrier generator 43 that generates a carrier with a frequency much higher than the pulse frequency of the pulse generator 47. , carrier gates 45A and 45B for superimposing the carrier on the input pulse inputted from the pulse generator 47 to each of the pulse amplification sections 61 and 63, and each of the pulse amplification sections 61 and 63 is a pulse amplifier. 49, 51 and rectifier circuits 53, 55, respectively, and also share a smoothing circuit 57.