JPH05137077A - Power unit for television transmitter - Google Patents

Abstract

PURPOSE:To attain the miniaturization and light weight of a power unit for a television transmitter using a klystron or a four-electrode transmitting tube and the elimination of an automatic voltage regulator. CONSTITUTION:AC output with frequency sufficiently higher than a commercial power source frequency can be obtained by setting a commercial three-phase AC power source as input, and output rectified once at a rectifier 11 and a smoothing circuit 31 as the input of an inverter 41 with higher input dynamic range. Desired DC output can be obtained by rectifying and smoothing such AC output at a rectifier 12 and a smoothing circuit 32 after boosting by a step-up transformer 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a television transmitter, and more particularly to a power supply device for a television transmitter using a crustron or a quadrupole transmitter tube as a power amplifier.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a power source of a television transmitter using this original transmission tube includes a step-up transformer 22 for boosting a commercial 3-phase AC power source to a high voltage, and a 3-phase all-phase converter. It has a rectifier 13 that performs wave rectification, and a smoothing circuit 33 that smoothes the rectified output to smooth the DC output to obtain the DC output.

The input commercial three-phase AC power source is stepped up by a step-up transformer 22, three-phase full-wave rectified by a rectifier 13, and then smoothed by a smoothing circuit 33. Is supplied to the transmission pipe as.

[0004]

In the conventional power supply device for the television transmitter, the commercial three-phase AC power source that has been input is simply boosted to obtain the DC output by the three-phase full-wave rectification and smoothing. There is a drawback in that boosting at a frequency is required and the size of the boosting transformer is extremely large, heavy and expensive.

Furthermore, since the input commercial three-phase AC power source is simply stepped up and full-wave rectified, it is an unstable circuit. In order to obtain stable performance of the transmitter, it is supplied to the transmitter. First, there is the drawback that the installation of an automatic voltage stabilizer (AVR) is essential.

The object of the present invention is to eliminate the above-mentioned drawbacks, significantly suppress the shape and cost of the step-up transformer, significantly reduce the circuit constant of the smoothing circuit, and eliminate the need for installing an AVR. To provide a power supply device.

[0007]

A power supply device for a television transmitter according to the present invention is a power supply device for a television transmitter which uses a commercial three-phase AC power supply as an input and uses a klystron or a quadrupole transmission tube as a power amplifier. First rectifier for rectifying the commercial three-phase AC power supply, a first smoothing circuit for smoothing the output of the first rectifier, and a high-frequency output of a predetermined frequency with the output of the first smoothing circuit as an input A step-up transformer that steps up the high-frequency output of the invert, a second rectifier that receives the step-up output of the step-up transformer and rectifies it, and a second rectifier that rectifies the output of the second rectifier. And a smoothing circuit.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In the embodiment shown in FIG. 1, a rectifier 11 as a first rectifier, a smoothing circuit 31 as a first smoothing circuit, an inverter 41 for converting direct current into alternating current, and a step-up transformer 21.
And a second rectifier 12 and a second smoothing circuit 32.

Next, the operation of this embodiment will be described.

The embodiment of FIG. 1 exemplifies a power supply device for providing a klystron beam power supply for a television transmitter using a klystron.

The commercial three-phase AC power input is a rectifier 11
Is subjected to 3-phase full-wave rectification.

Next, after being smoothed by the smoothing circuit 31, it is inputted to the inverter 41 and converted from the input direct current to the high frequency alternating current and outputted. Here, the inverter 41 uses a variable voltage variable frequency (VVVF) type.

By converting and outputting by the inverter 41, the high frequency AC voltage of the output is stabilized and the allowable range of the input voltage is expanded, which means that the rectifier 11 and the non-slip circuit 3 are provided.
It also leads to the relaxation of the ripple condition by 1.

The high frequency AC power source obtained by the inverter 41 is stepped up to a high voltage by the step-up transformer 21. Since the step-up transformer 21 steps up the high frequency AC power source, it is possible to significantly reduce the size and weight, and thus the cost.

The high-voltage and high-frequency AC power source obtained by the booster 21 is full-wave rectified into a direct current (pulsating current) by the rectifier 12, then smoothed by the smoothing circuit 32, and supplied to the klystron as a direct current output. It

In the smoothing circuit 32 as well, since the direct current (pulsating current) that has been subjected to high-frequency rectification is smoothed, the circuit constant can be made extremely small, and therefore the cost can be suppressed extremely low.

[0018]

As described above, according to the present invention, an inverter is introduced into a power source of a television transmitter to convert a rectified / smoothed output of a commercial power source into a high frequency AC power source, and then a rectified / smoothed output again. As a result, the step-up transformer and the smoothing circuit can be remarkably reduced in size and weight, and the cost can be significantly reduced.

Further, the input voltage range can be expanded by the inverter, and the allowable range of the rated voltage is plus or minus 2% using the conventional AVR, but the allowable range is plus or minus 10% of the rated voltage. There is an effect that it can be expanded to about 10% and AVR becomes unnecessary.

[Brief description of drawings]

FIG. 1 is for the configuration of a power supply device of a television transmitter according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a power supply device of a conventional television transmitter.

[Explanation of symbols]

 11 Rectifier 12,13 Rectifier 21,22 Step-up transformer 31,32,33 Smoothing circuit 41 Inverter

Claims (1)

[Claims] 1. A power supply device for a television transmitter, which uses a commercial three-phase AC power supply as an input and uses a klystron or a quadrupole transmission tube as a power amplifier, and a first rectifier for rectifying the input commercial three-phase AC power supply, A first smoothing circuit that smoothes the output of the first rectifier, an inverter that receives the output of the first smoothing circuit as an input and obtains a high frequency output of a predetermined frequency, and a step-up transformer that boosts the high frequency output of the inverter. And a second rectifier that receives the boosted output of the booster transformer and rectifies the boosted output, and a second smoothing circuit that rectifies the output of the second rectifier. Machine power supply.