CN203204483U

CN203204483U - Quick-response direct-current transmitter

Info

Publication number: CN203204483U
Application number: CN 201320254588
Authority: CN
Inventors: 国际平; 张文瑞; 吴明柱
Original assignee: HARBIN GUOLI ELECTRIC CO Ltd
Current assignee: HARBIN GUOLI ELECTRIC CO Ltd
Priority date: 2013-05-13
Filing date: 2013-05-13
Publication date: 2013-09-18
Anticipated expiration: 2023-05-13

Abstract

The utility model relates to a quick-response direct-current transmitter. A signal conversion separation unit is connected with a 4-20mA signal output unit; electricity is supported to the quick-response direct-current transmitter by a linear switch power supply of a power unit; the power unit comprises a signal conversion circuit power supply, a separation module power supply and a 4-20mA output circuit power supply; the signal conversion separation unit comprises an attenuation or amplification circuit, an eight-step low-pass Butterworth filter circuit and a separation operational amplifier AD210; the 4-20mA signal output unit comprises a two-step low-pass Butterworth filter circuit and a 4-20mA output circuit. The quick-response direct-current transmitter can ensure that the response output time of a signal input into a 4-20mA circuit is less than 15ms and a standard 4-20mA signal is quickly output into an automatic excitation control system to ensure that an exciting current follows the fluctuation of a load. The separation withstand voltage of an input signal on an output signal is 2500V, and terminal operating personnel and the quick-response direct-current transmitter are prevented from being damaged.

Description

Respond fast the direct current transmitter

Technical field

The utility model relates to signal isolation switch technology field, is specifically related to a kind of quick response direct current transmitter.

Background technology

Transmitter is that the signal of multi-form kind is converted to the DC analogue quantity electric signal that can be identified by controller, receiving terminal can be the equipment of simple function, no matter which type of signal can transfer to DCS system or robot control system(RCS) after corresponding transmitter is converted to unified standard signal.

The direct current transmitter is mainly used in the excitation automatic system of generating plant.Excitation automatic control system burden is kept the task of voltage levvl.When electric system normally moved, load was always often motionless, and the power of synchronous generator just correspondingly changes.Fluctuation along with load, need to carry out quick adjustment to keep in machine end or the system certain any voltage in given level to exciting current, this response speed that just needs the direct current transmitter promptly and accurately, and the domestic direct current transmitter response time is generally equal〉100ms, the excitation DC transmitter major part of generating plant all is external import, expensive, therefore research and development respond fast the direct current transmitter and solve the present situation that this equipment relies on external import.

Summary of the invention

The purpose of this utility model is to provide a kind of quick response direct current transmitter, and signal is input to 4-20mA Circuit responce output time less than 15ms.

The purpose of this utility model is achieved in that a kind of quick response direct current transmitter, comprise housing, power supply unit, signal conversion isolated location and 4-20mA signal output unit, signal conversion isolated location connects the 4-20mA signal output unit, and described power supply unit adopts the linear switch power supply to be the power supply of this transmitter; Described signal conversion isolated location comprises decay amplifying circuit, eight rank low pass Butterworth filter circuit and isolation amplifier AD210 and peripheral circuits; Described 4-20mA signal output unit comprises step low-pass Butterworth filter circuit and 4-20mA output circuit; Measuring-signal is delivered to eight rank low pass Butterworth filter circuit filterings behind the decay amplifying circuit, filtered signal is through isolation amplifier AD210 and peripheral circuit isolation, rfpa output signal is delivered to step low-pass Butterworth filter circuit filtering, filtered signal driver 4-20mA output circuit is exported DCS system and excitation automatic control system that the 4-20mA signal is sent to the generating plant at last.

The utility model also has following feature: aforesaid a kind of quick response direct current transmitter, and its input signal is withstand voltage to the output signal isolation to be 2500V, signal is input to 4-20mA Circuit responce output time less than 15ms.

The beneficial effects of the utility model have:

The utility model can make signal be input to 4-20mA Circuit responce output time less than 15ms, fast outputting standard 4-20mA signal to excitation automatic control system guarantees that exciting current follows the fluctuation of load, and the excitation automatic control system is carried out quick adjustment to keep in machine end or the system certain any voltage in given level to exciting current.Input signal is withstand voltage to the output signal isolation to be 2500V, can effectively prevent from responding fast direct current transmitter input signal and seal in high pressure, and prevent from terminal operation personnel and equipment are worked the mischief.

Description of drawings

Fig. 1 is housing schematic diagram of the present utility model;

Fig. 2 is theory diagram of the present utility model;

Fig. 3 is decay amplifying circuit schematic diagram of the present utility model;

Fig. 4 is eight rank low pass Butterworth filter schematic diagrams of the present utility model;

Fig. 5 is step low-pass Butterworth filter circuit theory diagrams of the present utility model;

Fig. 6 is 4-20mA output driving circuit schematic diagram of the present utility model;

Wherein, 1, signal conversion isolated location, 2,4-20mA signal output unit, 3, decay amplifying circuit, 4, eight rank low pass Butterworth filter circuit, 5, isolation amplifier AD210 and peripheral circuit, 6, step low-pass Butterworth filter circuit, 7, the 4-20mA output circuit.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is further described:

Embodiment 1

Shown in Fig. 1-2, a kind of DBS/Q-311/321 type responds the direct current transmitter fast, comprise housing, power supply unit, signal conversion isolated location and 4-20mA signal output unit, signal conversion isolated location connects the 4-20mA signal output unit, and described power supply unit adopts the linear switch power supply to be the power supply of this transmitter; Described signal conversion isolated location comprises decay amplifying circuit, eight rank low pass Butterworth filter circuit and isolation amplifier AD210 and peripheral circuits; Described 4-20mA signal output unit comprises step low-pass Butterworth filter circuit and 4-20mA output circuit; Measuring-signal is delivered to eight rank low pass Butterworth filter circuit filterings behind the decay amplifying circuit, filtered signal is through isolation amplifier AD210 and peripheral circuit isolation, rfpa output signal is delivered to step low-pass Butterworth filter circuit filtering, filtered signal driver 4-20mA output circuit is exported DCS system and excitation automatic control system that the 4-20mA signal is sent to the generating plant at last.Its input signal is withstand voltage to the output signal isolation to be 2500V, and signal is input to 4-20mA Circuit responce output time less than 15ms.

Embodiment 2

1, housing: consisted of by fire-retardant black ABS plastic, be divided into loam cake, guide rail buckle, case cover composition.

2, power supply unit: adopt the power supply of Switching Power Supply linear process, guarantee the stable and reliable of system power supply, improve system accuracy.

3, signal conversion isolated location: direct current signal is delivered to eight rank low pass Butterworth filter circuit behind the decay amplifying circuit, after carrying out filtering and removing undesired signal, delivers to isolation amplifier AD210, carries out the signal isolation.

4,4-20mA signal output unit: the signal of reception signal conversion isolated location output is delivered to and is delivered to the 4-20mA output driving circuit after step low-pass Butterworth filter circuit is removed high-frequency interferencing signal, output 4-20mA signal, the 4-20mA signal can be delivered to DCS system and the excitation automatic control system of generating plant.

5, respond fast its input signal of direct current transmitter to the withstand voltage 2500V of being of output signal isolation, can effectively prevent from responding fast direct current transmitter input signal and seal in high pressure, to the harm of terminal operation personnel and equipment.

Embodiment 3

Response direct current transmitter job step is as follows fast:

Direct current signal is delivered to eight rank low pass Butterworth filter circuit (such as Fig. 4) after decay amplifying circuit (such as Fig. 3) is processed, after carrying out filtering removal undesired signal, deliver to isolation amplifier AD210, carry out the signal isolation, signal is delivered to and is delivered to 4-20mA output driving circuit (such as Fig. 6) after step low-pass Butterworth filter (such as Fig. 5) circuit is removed high-frequency interferencing signal after the isolation, output 4-20mA signal, the 4-20mA signal can be delivered to DCS system and the excitation automatic control system of generating plant.

The beneficial effects of the utility model have:

1, the utility model is a kind of quick response direct current transmitter, signal is input to 4-20mA Circuit responce output time less than 15ms, fast outputting standard 4-20mA signal to excitation automatic control system guarantees that exciting current follows the fluctuation of load, and the excitation automatic control system is carried out quick adjustment to keep in machine end or the system certain any voltage in given level to exciting current.

2, respond fast direct current transmitter input signal to the withstand voltage 2500V of being of output signal isolation, can effectively prevent from responding fast direct current transmitter input signal and seal in high pressure, to the harm of terminal operation personnel and equipment.

Claims

1. one kind responds the direct current transmitter fast, comprise housing, power supply unit, signal conversion isolated location and 4-20mA signal output unit, it is characterized in that: signal conversion isolated location connects the 4-20mA signal output unit, and described power supply unit adopts the linear switch power supply to be the power supply of this transmitter; Described signal conversion isolated location comprises decay amplifying circuit, eight rank low pass Butterworth filter circuit and isolation amplifier AD210 and peripheral circuits; Described 4-20mA signal output unit comprises step low-pass Butterworth filter circuit and 4-20mA output circuit; Measuring-signal is delivered to eight rank low pass Butterworth filter circuit filterings behind the decay amplifying circuit, filtered signal is through isolation amplifier AD210 and peripheral circuit isolation, rfpa output signal is delivered to step low-pass Butterworth filter circuit filtering, filtered signal driver 4-20mA output circuit is exported DCS system and excitation automatic control system that the 4-20mA signal is sent to the generating plant at last.

2. a kind of quick response direct current transmitter as claimed in claim 1 is characterized in that: its input signal is 2500V to the output signal isolation is withstand voltage, and signal is input to 4-20mA Circuit responce output time less than 15ms.