JP2007189799A - Pulse power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulse power supply having a short voltage rise time and a high switching efficiency in order to enhance the performance of a radar. <P>SOLUTION: The pulse power supply comprises a full-bridge converter 11, a circuit 12 for driving the full-bridge converter 11, a circuit 13 for detecting the output voltage from the full-bridge converter 11, and a power supply control section 14 performing optimal PWM control by feeding back that output voltage detection value. After the voltage has risen, a selector 38 is switched from a source oscillation circuit 36 to an N frequency division circuit 37 upon elapsing a predetermined time in a delay circuit 43 in order to decrease the working frequency thus operating the pulse power supply as a stable DC power supply. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to high stabilization of a pulse power supply, and more particularly to a pulse power supply apparatus that provides a stable pulse voltage to a radar transmission module.

  Conventionally, a large-capacity pulse power supply device is generally based on a capacitor bank system in which capacitors are used by switching, or a pulse drive system in which pulse width modulated (hereinafter referred to as PWM) pulse signals are rectified and used. In either case, however, the characteristics fluctuate due to differences in output voltage, load size, and pulse period. Therefore, when a pulse voltage is applied to the radar transmission module, there arises a problem that the voltage fluctuates for each pulse. In addition, it is difficult to generate a long pulse with good voltage rise characteristics by modulating with a short pulse width. From the viewpoint of switching loss, when a conventional pulse power supply is used for a radar transmission module, the performance as a radar is improved. There is a problem that can not be.

As a method for stabilizing such a pulse power supply, a stabilization method described in Patent Document 1 is known. This stabilization method stabilizes the high-current pulse current at high speed against fluctuations in the power supply voltage in a high-current pulse laser such as a copper vapor laser or excimer laser instead of the radar power supply, thereby degrading characteristics such as overshoot. It is something to avoid. Therefore, although there is a certain effect that the current is stabilized, it has not essentially solved the problem of the radar pulse power supply.
Japanese Patent No. 3372868

  The present invention has been made in view of the above-described problems of the conventional pulse power supply, and the object of the present invention is to provide a pulse power supply apparatus that has a fast voltage rise time and good switching efficiency in order to improve radar performance. It is to provide.

  In order to solve the above-mentioned problem, according to claim 1 of the present invention, a first frequency, a power source operating at a second frequency lower than the first frequency, and the first time from power on until a predetermined time elapses. And a switch that is controlled to be switched by the second frequency after a predetermined time has elapsed, and is provided with a pulse power supply device.

  According to claim 2 of the present invention, a pulse power supply, a drive circuit that drives the pulse power supply, a pulse power supply control unit that controls the drive circuit, and an output voltage detection that detects an output voltage of the pulse power supply. The pulse power supply controller includes a first oscillation source that oscillates at a first frequency, a second oscillation source that has an oscillation frequency lower than the frequency of the first oscillation source, and the first oscillation A switch for switching from the output of the source to the output of the second oscillation source, a voltage control unit for controlling the drive circuit so that the output voltage of the output voltage detection unit becomes a predetermined voltage, and the output voltage detection unit A pulse power supply device comprising: a voltage determination unit that determines a detection voltage; and a delay circuit that delays an output of the voltage determination unit and controls the switch.

  According to the present invention, since the oscillation frequency of the pulse power supply is initially increased, the rise time of the pulse voltage is accelerated, and the extra time until the radar RF injection timing is reduced. Further, by switching the oscillation frequency of the pulse power supply to the lower one, the switching efficiency is not lowered even in the case of a long pulse. As a result, not only the power of the radar apparatus can be reduced, but also the effect that the heat generation of the power source and the heat generation of the RF element serving as a load can be reduced can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 shows a circuit configuration of a pulse power supply device according to an embodiment of the present invention. The pulse power supply circuit of this embodiment includes a full bridge converter 11, a drive circuit 12 that drives the full bridge converter 11, an output voltage detection circuit 13 that detects the output voltage of the full bridge converter 11, and the output voltage detection circuit. And a pulse power supply control unit 14 that performs optimum PWM control by feeding back 13 output values.

  The primary side of the full bridge converter 11 includes a choke coil 22 that suppresses the upstream of the switching current of the constant voltage source 21 and the full bridge converter 11, a capacitor 23 that flows the switching current, and a main circuit of the full bridge converter 11. The switching elements 24, 25, 26, and 27 are formed. The secondary side is constituted by rectifier circuit diodes 29, 30, 31, 32, a rectifier circuit choke coil 33, and a rectifier circuit capacitor 34 via the transmission transformer 28. Further, a radar transmission / reception module 35 is connected to the output.

  The drive circuit 12 that drives the switching elements 24 to 27 (S1 to S4) forming the main circuit of the full bridge converter 11 operates in accordance with a control signal from the pulse power supply control circuit 14.

  The pulse power supply control unit 14 includes a source oscillation circuit 36 that oscillates at a basic frequency, an N divider circuit 37 that divides the fundamental frequency output, and a source oscillation frequency output from the source oscillation circuit 36 that is divided by N. A selector 38 that selects one of the frequency outputs and a PWM circuit 39 that operates at the frequency supplied from the selector 38 are connected to instruct the PWM circuit 39 of a voltage to be a control target in the pulse power supply control unit 14. The voltage setting unit 40, the operational amplifier 41 that amplifies the feedback signal of the output voltage detection unit 13, the voltage determination circuit 42 that determines the signal of the output voltage detection unit 13, the output of the voltage determination circuit 42, and the selector 38 The delay circuit 43 is set in consideration of the output response speed of the pulse power supply.

  Next, the operation of this embodiment will be described with reference to the drawings. FIG. 2 shows the main outputs and operation states of the circuit in order to explain the operation of the pulse power supply circuit in this embodiment of the present invention. The outline of the operation of the present invention is as follows.

  When the operating frequency of the pulse power supply is increased, a voltage that rises quickly can be supplied to the load. Raising the operating frequency improves the starting characteristics of the radar pulse voltage. However, when the operating frequency is increased, the switching loss increases in proportion to the frequency. Even if it is devised to reduce the switching loss, the drive power of the switching element cannot be completely eliminated. Therefore, in the present invention, after the voltage rises, the operating frequency is lowered so as to operate as a stable DC power source. For this purpose, a control circuit for switching from a high frequency to a low frequency when a certain time elapses is provided.

  The full bridge converter 11 can transmit power and stabilize the output. When it is desired to start the pulse power supply at high speed, the converter is operated at a source oscillation frequency of 10 MHz, for example. The higher the oscillation frequency, the faster the power supply rises, and the choke coil and capacitor used can be miniaturized. However, when the oscillation frequency is increased, the switching loss is increased and the efficiency as a power source is lowered.

  Therefore, when the output voltage of the output voltage detector 13 reaches the set value, the selector 38 switches from the source oscillation circuit 36 to the N divider circuit 37. For example, when N = 10, the divider circuit 37 The oscillation frequency is 1/10 of 1/10. Lowering the operating frequency applied to the full-bridge converter 11 reduces the semiconductor switch loss, and the efficiency can be increased during long pulse operation.

  The operation of the pulse power supply that generates the pulse width necessary for the radar is determined by the timing of the ON / OFF signal shown in FIG. Immediately after the power supply starts operation, the full bridge converter 11 operates so as to approach the set value of the voltage setting unit 40. At this time, that is, at the time indicated by selector A in FIG. 2B, the source oscillation circuit 36 is selected by the selector 38, and the operating frequency of the full bridge converter 11 is the same as that of the transformer and source in FIG. As shown in the oscillation part, switching is repeated at a high frequency of 10 MHz.

    Therefore, since the full-bridge converter 11 can send power in units of time quickly, the output voltage Eo of the power supply starts up quickly and smoothly with a fine switching operation.

  Thereafter, when the output voltage Eo of the power source detected by the output voltage detection circuit 13 approaches the value of the voltage setting unit 40, the voltage determination circuit 42 outputs a signal so that the selector 38 selects the N frequency dividing side. . At this time, since the switching of the switching frequency can be adjusted by the delay circuit 43, the stability of the output voltage is maintained by a fine switching operation with less overshoot and undershoot (FIG. 2 (d)).

  When the slow switching frequency divided by N by the selector 38 is selected, the number of operations of the full bridge converter 11 is reduced, so that the switching loss is reduced and the output voltage Eo can be obtained with an efficient power supply operation.

  As described above, the rising time and convergence of the switching output voltage are accelerated by using a source oscillation having a high frequency in the rising portion, and the switching frequency is slowed by using the N frequency dividing frequency in the portion where the output voltage is almost flat. It is possible to reduce the switching loss and the drive loss of the switch, and to operate the power supply so as to improve the efficiency.

  As described above, according to the pulse power supply device according to the embodiment of the present invention configured as described above, since a power supply with a fast rise can be achieved, the startup time of the pulse voltage is shortened, and the RF injection timing of the radar is reached. Less extra time. Further, by switching the oscillation frequency of the pulse power source, the switching efficiency is not lowered even in the case of a long pulse. Thereby, not only the power of the radar apparatus is reduced, but also the heat generation of the power source and the heat generation of the RF element serving as a load can be reduced.

  The present invention is not limited to the above-described embodiment, and can be embodied without departing from the spirit of the invention in the implementation stage. For example, in the embodiment, an insulation type full bridge converter has been described as an example, but a non-insulation converter or a flyback type converter can also be applied to the present invention. In the above embodiment, the drive circuit is controlled by pulse width modulation so that the output voltage of the power supply is constant. However, the drive circuit may be controlled by other methods.

It is a circuit block diagram of the pulse power supply device in one Example of this invention. It is a figure explaining operation | movement of the pulse power supply device in one Example of this invention.

Explanation of symbols

11 ... Full-bridge converter,
12 ... Drive circuit,
13: Output voltage detection circuit,
14 ... pulse power supply control unit,
21 ... Constant voltage source,
22 ... Choke coil,
23: Capacitor,
24, 25, 26, 27 ... switching elements,
28 ... Transformer for transmission,
29, 30, 31, 32 ... rectifier diodes,
33 ... Choke coil for rectifier circuit,
34: Capacitor for rectifier circuit,
35 ... Radar transceiver module,
36: Source oscillation circuit,
37 ... N divider circuit,
38 ... selector,
39 ... PWM circuit,
40: Voltage setting unit,
41 ... operational amplifier,
42 ... Voltage determination circuit,
43: Delay circuit.

Claims (5)

A power supply operating at a first frequency and a second frequency lower than the first frequency;
A switch that is switching-controlled by the first frequency from the power-on until a predetermined time has elapsed, and that is switch-controlled by the second frequency after the predetermined time has elapsed,
A pulse power supply device comprising: Pulse power supply,
A drive circuit for driving the pulse power supply;
A pulse power supply controller for controlling the drive circuit;
An output voltage detection unit for detecting an output voltage of the pulse power supply;
The pulse power supply controller
A first oscillation source that oscillates at a first frequency;
A second oscillation source having an oscillation frequency lower than the frequency of the first oscillation source;
A switch for switching from the output of the first oscillation source to the output of the second oscillation source;
A voltage controller that controls the drive circuit so that the output voltage of the output voltage detector becomes a predetermined voltage;
A voltage determination unit for determining a detection voltage of the output voltage detection unit;
A delay circuit for delaying the output of the voltage determination unit and controlling the switch;
A pulse power supply device comprising:   3. The pulse power supply device according to claim 2, wherein the voltage control unit is a pulse width modulation control unit that controls the drive circuit by changing a pulse width.   4. The pulse power supply device according to claim 2, wherein the pulse power supply is a full bridge converter.   5. The pulse power supply device according to claim 2, wherein the second oscillation source is a frequency divider that divides the oscillation output of the first oscillation source. 6.

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