JPS63131624A - Transistor equipment - Google Patents

Abstract

PURPOSE:To attain miniaturization of a power supply and to protect damage of the member due to a rush current by providing a means starting plural DC power supplies sequentially to drive a power amplifier so as to reduce the rush current of the equipment. CONSTITUTION:A switch circuit 9 comprising DC power supplies 8a-8c,...8n corresponding to n-set of power amplifiers 2, 3b, 3c,...3n and switches awa-swc,...swn and a control circuit 10 operating sequentially each switch are provided. In applying a DC power supply to the transmission equipment, the control circuit 10 activates the switches swa-swc,...swn sequentially, the DC power supplies 8a-8c,...8n are started sequentially by the power supply 6 to drive the power amplifiers 2, 3b, 3c...3n. Thus, the peak value of the rush current is reduced remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmitting device, and more particularly to a transmitting device that connects a plurality of power amplifiers in parallel to combine and output power.

[Conventional technology]

FIG. 3 is a block diagram showing an example of a conventional transmitting device;
The figure is a diagram showing an example of the input current change in FIG. 3. In FIG. 3, a transmitting device amplifies a signal from a high frequency signal generator 1 to a desired level and sends it to an antenna.
The transmitting device of this example includes a power amplifier 2 that amplifies the final stage power amplifier 3 to a level that can excite it, a power divider 4 that distributes and inputs this excitation signal to the power amplifier 3, and a power synthesizer that combines the output of the power amplifier 3. It consists of a power combiner 5 that outputs the power to the antenna, a DC power supply 7 that drives the power amplifiers 2 and 3, and a power supply equipment 6 that drives the device.

Since the input current of the DC power supply 7 has a large inrush current peak value as shown in FIG. 5, a circuit configuration as shown in FIG. 4 is adopted to suppress this. FIG. 4 is a circuit diagram showing a specific example of the DC power supply in FIG. 3, in which an inrush current prevention circuit consisting of a current limiting resistor 71 and a relay 72 is inserted into the input section, and the contacts of the relay 72 are closed when the transmitting device is started. The current flowing through the current limiting resistor 71 is rectified by the rectifier 73,
A DC-DC inverter section 74 converts the voltage into a desired DC voltage and outputs it. However, the instantaneous power of the current limiting resistor 71
It is difficult to limit the inrush current to less than the input current at the rated load due to limitations such as the power supply and the shape of the DC power supply.

[Problem that the invention seeks to solve]

In the conventional transmitter described above, inrush current at startup is unavoidable, and therefore power supply equipment that takes inrush current capacity into account is required.In addition, in order to further reduce inrush current, inrush current in the DC power supply is required. This has the disadvantage that the limiting resistor requires a large amount of power, making the device large.

[Means for solving problems]

A transmitting device of the present invention is a transmitting device that combines and outputs the output power of a plurality of power amplifiers, and includes means for sequentially starting a plurality of DC power supplies for driving the power amplifiers.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the transmitting device of the present invention, and FIG. 2 is a diagram showing an example of input current change in FIG. 1.

In FIG. 1, the same components as in the conventional example are given the same reference numerals as in FIG. 3. In this embodiment, n power amplifiers 2,
DC power supplies 8a, 8b, 8 corresponding to 3b, 3c, ~3n
c, ~8n, and DC power supplies 8a, 8b, 8c, ~8n
Switches corresponding to s w a , s w b ,
Switch circuit 9 consisting of S W C, ~ S W n
and a control circuit 10 that sequentially operates each switch of the switch circuit 9.

In this embodiment, when turning on the DC power to the transmitting device, the control circuit 10 sequentially operates the switches swa, swb, 5wC1 to sWn, and each DC power supply 8a.

8b, 8c, .about.8n are sequentially activated by power supply equipment 6 to drive power amplifiers 2, 3b, 3c, .about.3n, respectively. Therefore, the input current of the entire transmitter has a waveform as shown in FIG. 2, and the inrush current peak value is significantly reduced compared to the conventional example.

〔Effect of the invention〕

As explained above, in a transmitting device that combines and transmits the outputs of multiple power amplifiers, the inrush current of the device can be reduced by sequentially turning on multiple DC power supplies. This has the effect of reducing the size of the equipment and protecting equipment from damage caused by inrush current.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of the transmitting device of the present invention, Figure 2 is a diagram showing an example of input current change in Figure 1, and Figure 3 is a block diagram showing an example of a conventional transmitting device. 4 is a circuit diagram showing a specific example of the DC power supply in FIG. 3, and FIG. 5 is a diagram showing an example of input current change in FIG. 3. 1... High frequency signal generator, 2, 3, 3b, 3c. ~3n...Power amplifier, 4...Power divider, 5...
・Power combiner, 6...Power supply equipment, 7.8a, 8b, 8
c. ~8n...DC power supply, 9...Switch circuit, 1o.
... Control circuit, 71... Current limiting resistor, 72... Relay, 73... Rectifier section, 74... DC-DC inverter section. Taobun 83 Figure 4 Figure 5 Section B Strange question

Claims (1)

[Claims] A transmitting device that combines and outputs the output power of a plurality of power amplifiers, the transmitting device comprising means for sequentially starting a plurality of DC power supplies for driving the power amplifiers.