CN102026015A - Radio frequency power detection device - Google Patents

Abstract

The invention aims at providing a radio frequency power detection device. A radio frequency power signal output by a transmitter is accurately sampled, compensated, amplified and acquired, and then displayed and sent to an upper machine for monitoring and alarming. The radio frequency power detection device comprises a transmitter system, an orientating coupler, a sampling and amplifying circuit, an AD conversion module, a microprocessor module, a display module and a communication module, and is applied to the detection of the power signal of the transmitter.

Description

A kind of device for detecting power of radio frequency

[technical field]

The present invention relates to broadcast television industry, be specifically related to the device for detecting power of radio frequency that a kind of field of broadcast televisions transmitter power detects usefulness.

[background technology]

To realize the transmission of TV and broadcast singal in field of broadcast televisions, must be with powerful transmitter with signal modulation back transmission.The incident power of transmitter and reflection power are the important parameters of reflection transmitter operation conditions, and the detection of its numerical value is the technical problem that must solve in the broadcast television signal transmission course.

The object of the invention is to provide a kind of device for detecting power of radio frequency, and the rf power signal of transmitter output is taken a sample accurately, and compensation shows after amplifying, gathering and send the host computer monitoring, alarming.

ZTE Co., Ltd's application number is that 200720181453.4 Chinese utility model patent has been announced a kind of " RF power sensing circuit " in addition.But the radio-frequency power monitoring device that is applied to field of broadcast televisions yet there are no report

[summary of the invention]

The object of the invention is to provide a kind of device for detecting power of radio frequency, and the rf power signal of transmitter output is taken a sample accurately, and compensation shows after amplifying, gathering and send the host computer monitoring, alarming.

A kind of device for detecting power of radio frequency comprises transmitter system, directional coupler, and sampling amplification circuit, the AD modular converter, microprocessor module, display module, communication module is applied to the transmitter power input.Described AD modular converter (analog-to-digital conversion module) is ADC0838, and 8 road 8BIT analog to digital converters are selected its differential input pattern for use.

[description of drawings]

Fig. 1 is described device for detecting power of radio frequency theory diagram.

Fig. 2 is described AD modular converter analog-to-digital conversion flow chart.

Fig. 3 is described sampling amplification circuit schematic diagram.

[embodiment]

Below in conjunction with embodiment and with reference to accompanying drawing the present invention is further described.

Fig. 1 is the described device for detecting power of radio frequency theory diagram of an embodiment of the present invention.Mainly contain 101 transmitter systems; 102 directional couplers; 103 sampling amplification circuits; The 104AD modular converter; 105 microprocessor modules; 106 display modules; 107 communication modules.

Radiofrequency signal,, is convenient to 103 sampling amplification circuits and is handled to reduce signal strength signal intensity signal attenuation-50DB through 102 directional couplers after the output of 101 transmitter systems.Signal 103 advances the 104AD analog-to-digital conversion module behind sampling amplification circuit, and deposits transformation result in 105 microprocessors.105 microprocessors show performance number by 106 display modules are local, or the data center that performance number is delivered to far-end by 107 communication modules preserves processing.

Fig. 2 is the described 103 sampling amplification circuit schematic diagrams of an embodiment of the present invention.103 sampling amplification circuit output signals:

$U_6=0.67U_{\mathrm{in}}\×(1+\frac{R8}{R6})\×(1+\frac{R11}{R10})+\frac{5\×R11}{R10}$

Analog-to-digital conversion module is selected ADC0838 for use, and 8 road 8BIT analog to digital converters, its input signal have two kinds of single-ended input and differential inputs.Select its differential input pattern for use, make

And the adjusting zeroing circuit makes:

Then:

Analog-to-digital reference voltage is 2.5V, carries out the conversion value that 8 analog-to-digital conversion obtain to be:

$U_{\mathrm{code}}=\frac{3\×256}{100\×2.5}\×\sqrt{{5P}_s}$

With two ends square, then:

So:

If same reason directional coupler decay-47DB can calculate:

Certainly actual situation may be that 102 directional coupler attenuation multiples are not very accurate, but according to the linear relationship between transmitting power and the hand over word square, can obtain linear coefficient in a certain power points adjustment.

Fig. 3 is the described AD modular converter of an an embodiment of the present invention analog-to-digital conversion flow chart.This flow process starts from step 301.Step 302 is provided with input pattern and selects the conversion way.Step 303 enters the analog-to-digital conversion process.Step 304 judges whether conversion is complete, and incomplete continuation is judged.Step 305 receives data.Step 306 return data.

Obtain relation between transmitting power and the analog-to-digital conversion value through this flow process, now just power can be presented on the display, perhaps this parameter is informed data center, so that the centralized management of realization data by communication interface to inform the local user.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvement and replenish, these improvement and replenish and also should be considered as protection scope of the present invention.

Claims (2)

1. a device for detecting power of radio frequency comprises transmitter system, directional coupler, and sampling amplification circuit, the AD modular converter, microprocessor module, display module, communication module is characterized in that being applied to the transmitter power input.

2. AD modular converter according to claim 1 is characterized in that analog-to-digital conversion module is ADC0838, and 8 road 8BIT analog to digital converters are selected its differential input pattern for use.

Images