JPH0946252A - Receiver - Google Patents

Abstract

[PROBLEMS] To obtain a receiving device in which internal noise of a microcomputer, a switching power supply, or the like does not radiate to a tuner, a demodulation circuit, or the like. In a receiver for detecting and demodulating an antenna input signal by a tuner D and outputting a processing result in a microcomputer E to a driver F for driving a load A, a power supply voltage is supplied to the microcomputer 3, the driver 5, and these. The switching power supply 6 for supplying the power is mounted on the first printed circuit board 7, and the tuner and demodulation circuit 2 is mounted on the second printed circuit board 8 different from the first printed circuit board 7. 2 Between the load side interface 9 and the antenna side interface 12 mounted on the printed circuit board 8 respectively, the common mode coil 1
A receiver connected by a parallel-core shielded wire 13 including 1 and 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver used for, for example, a remote-controlled wireless crane, and more particularly to a receiver which prevents noise radiation.

[0002]

2. Description of the Related Art As is well known, for example, in a wireless crane that is remotely operated by radio, a load A which is an actuator of each functional unit is remotely operated by using a receiving device as shown in FIG.

That is, an input signal of the monopole antenna B which receives a radio wave from a transmitter (not shown) is detected and demodulated by a tuner D mounted on the surface of a printed circuit board C of the receiving apparatus, and the input signal from the tuner D is received. The driver F is operated according to the processing result of the microcomputer E which processes the input signal. A switching power supply G that applies a voltage to the tuner D, the microcomputer E, and the driver F is simultaneously mounted on the printed circuit board C, and the switching power supply G supplies the power of the receiving device.

[0004]

By the way, according to the configuration of the conventional receiving apparatus as described above, the original receiving performance may not be obtained, the operation of the receiving apparatus becomes unstable, and the reliability of the receiving apparatus is reduced. descend.

In view of the problems of the conventional receiving apparatus as described above, an object of the present invention is to obtain a receiving apparatus in which internal noise of a microcomputer, a switching power supply, etc. does not radiate to a tuner, a demodulation circuit, etc. is there.

[0006]

In order to achieve this object, the present invention provides a receiving apparatus for detecting and demodulating an antenna input signal by a tuner and outputting the processing result by a microcomputer to a driver for driving a load. A microcomputer, the driver, and a switching power supply that supplies a power supply voltage to these are mounted on the first printed circuit board,
A tuner and a demodulation circuit are mounted on a second printed circuit board different from the first printed circuit board, and between the load side interface and the antenna side interface mounted on the first printed circuit board and the second printed circuit board, respectively. It is proposed to couple with a parallel core shield wire including a common mode coil.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the embodiment of the present invention will be described below with reference to FIG. 1 is a block diagram corresponding to FIG. 2 of the receiving apparatus of the present invention. As understood from the comparison between FIG. 1 and FIG. 2, the tuner and demodulation circuit 2 to which the received signal from the monopole antenna 1 is input. , A microcomputer 3 that processes signals from the tuner and demodulation circuit 2, a driver 5 of a load 4 that operates by an output signal of the microcomputer 3, a power supply voltage for the tuner and demodulation circuit 2, the microcomputer 3, and the driver 5. And a switching power supply 6 for supplying

In the present invention, these microcomputer 3, driver 5 and switching power supply 6 are mounted on the first printed circuit board 7 inside the receiver, and the monopole antenna 1, tuner and demodulation circuit 2 are 1
The second printed board 8 different from the printed board 7 is mounted, and the load side common mode is provided between the load side interface 9 provided on the first printed board 7 and the antenna side interface 10 provided on the second printed board 8. The first printed circuit board 7 is electrically connected to the parallel core shield wire 13 including the coil 11 and the antenna-side common mode coil 12, and the shield part of the parallel core shield wire 13 has the shield parts.
And the ground wire 14 of the second printed circuit board 8 is connected.

That is, although the received signal of the monopole antenna 1 is tuned and detected by the tuner and demodulation circuit 2 and demodulated into a digital signal, the digital signal is converted from voltage to current by the common mode coil 12 on the antenna side, and is long. It is supplied to the microcomputer 3 through the core wire of the parallel core shield wire 13 of about 7 to 10 and the load side interface 9. Further, the power supply voltage from the switching power supply 6 on the first printed board 7 is supplied to the tuner and demodulation circuit 2 via the load side interface 9, the core wire of the parallel core shield wire 13, and the antenna side interface 10.

Since the receiving apparatus according to the illustrated embodiment has the above-described configuration, during operation of the receiving apparatus, as in the conventional case,
Although internal noise is generated from the microcomputer 3, the driver 5, the switching power supply 6, etc., a parallel core shield line 13 for choking high frequency noise and a choke for low frequency noise are provided between these components and the tuner and demodulation circuit 2. Since they are coupled via the antenna common mode coil 12 and the load common mode coil 11, the internal noise of the microcomputer 3, the driver 5, and the switching power supply 6 may adversely affect the operation of the tuner and the demodulation circuit 2. Disappear.

Therefore, according to the receiving apparatus of the illustrated embodiment, it is possible to suppress the copying of internal noise, maintain a good receiving characteristic, and provide a highly reliable structure.

[0012]

As is apparent from the above description, according to the present invention, it is possible to provide a receiving device which prevents the tuner and the demodulation circuit from being destabilized by noise radiation.

[Brief description of drawings]

FIG. 1 is a block diagram of a receiving device according to the present invention.

FIG. 2 is a block diagram of a conventional receiving device.

[Explanation of symbols]

 1 Monopole Antenna 2 Tuner and Demodulation Circuit 3 Microcomputer 4 Load 5 Driver 6 Switching Power Supply 7 1st Printed Circuit Board 8 2nd Printed Circuit Board 9 Load Side Interface 10 Antenna Side Interface 11 Load Side Common Mode Coil 12 Antenna Side Common Mode Coil 13 Parallel core shielded wire

Claims (1)

[Claims] 1. A receiving device for detecting and demodulating an antenna input signal by a tuner and outputting a processing result by a microcomputer to a driver for driving a load, the microcomputer, the driver, and a switching power supply for supplying a power supply voltage to these. Mounted on the first printed circuit board,
A tuner and a demodulation circuit are mounted on a second printed circuit board different from the first printed circuit board, and between the load side interface and the antenna side interface mounted on the first printed circuit board and the second printed circuit board, respectively. A receiver characterized by being coupled by a parallel core shield wire including a common mode coil.