High-efficiency energy-saving current amplifier

A current amplifier, high-efficiency and energy-saving technology, applied in the direction of power amplifiers, can solve the problems of low precision, small maximum output current, large power loss, etc., to achieve the effect of improving sampling accuracy, reducing power loss, and increasing the maximum output current

Inactive Publication Date: 2016-03-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a high-efficiency energy-saving current amplifier, which can solve the problems o

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[0016] The present invention provides a high-efficiency energy-saving current amplifier. The present invention will be further described below in conjunction with the description of the drawings and the specific embodiments.

[0017] Reference figure 1 , figure 2 As shown, the high-efficiency and energy-saving current amplifier is used in a relay protection tester, and is composed of an input stage, a driving stage, and an output stage. The input stage is composed of LF356 operational amplifier, the driving stage is composed of transistors T1 and T3, and the output stage is composed of complementary Darlington circuits. When the collector of T3 is a positive half cycle, the transistors T4 and T5 are turned on. When the collector of T3 is a negative half cycle, the transistors T6 and T7 are turned on. The transistor T3 drives the transistors T4 and T6, and the transistors T4 and T6 drive the transistors T5 and T7, respectively.

[0018] When the output current of T5 and T7 is gr...

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Abstract

The invention provides a high-efficiency energy-saving current amplifier, belongs to the field of relay protection test apparatuses, and in particular relates to a relay protection tester. A drain D of an NMOS tube, which is taken as an input end, is connected with an output end of a current amplifier equivalent module; a source of the NMOS tube, which is taken as an output end, is connected with a load; a grid of the NMOS tube is connected with a logic control loop; the value of a sampling resistor R15 is reduced from 0.1 ohm to 0.02 ohm; an added sampling resistor R16 with the value of 0.3 ohm is added between the drain D and the source S; on and off of the NMOS tube are controlled through the voltage size of the grid; when output current of the current amplifier is larger than or equal to 15 A, the voltage of the grid is up to a threshold; when the NMOS tube is in an on state, current flows through a branch of the NMOS tube; when the output current of the current amplifier is smaller than 15 A, the voltage of the grid is not up to the threshold, the NMOS tube is in an off state, and the current flows through a branch of the added sampling resistor. According to the high-efficiency energy-saving current amplifier, which is provided by the invention, when the voltage of the grid is up to the threshold, the NMOS tube has the capability of forming a conducting channel between the source and the drain; therefore, the power loss of the relay protection tester current amplifier is reduced, the sampling precision is improved, the investment is reduced, the maximum output current is increased and the like.

Description

technical field [0001] The invention belongs to the field of relay protection test equipment, in particular to a relay protection tester device. Background technique [0002] In the field of relay protection testing, relay protection testers are the most common measuring instruments. Based on the "Technical Conditions of Microcomputer Relay Protection Test Device (Discussion Draft)" issued by the Ministry of Electric Power, extensively listen to user opinions, summarize the current advantages and disadvantages of similar domestic products, and make full use of modern advanced microelectronic technology and devices Realized a relay protection testing instrument. The analog voltage output from the relay protection tester must be amplified by the amplifier before it can be sent to the input terminal of the relay under test. The power amplifier is further divided into a voltage amplifier and a current amplifier. As an important part of the experimental device, the performance ...

Claims

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Application Information

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IPC IPC(8): H03F3/20
Inventor 夏瑞华白坚实刘博
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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