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)
4 Cites 2 Cited by

AI-Extracted Technical Summary

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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Method used

In this device, adopt negative feedback loop, add NMOS tube switch control, increase new sampling resistance, and change former sampling resistance resistance value. Therefore, the current amplifier h...
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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.

Application Domain

Power amplifiers

Technology Topic

OhmTester device +10

Image

  • High-efficiency energy-saving current amplifier
  • High-efficiency energy-saving current amplifier

Examples

  • Experimental program(1)

Example Embodiment

[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 greater than or equal to 15 amperes, the gate voltage reaches the threshold, the NMOS tube is in the closed state, and the current flows through the NMOS tube branch, the power loss of the current amplifier is: P=I o *I o *R15, sampling voltage is V o = I o *R15; when the output current of T5 and T7 is less than 15 amperes, the gate voltage does not reach the threshold, the NMOS tube is in the off state, and the current flows through the newly added sampling resistor R4 branch, the power loss of the current amplifier is: P=I o *I o *(R16+R15), the sampling voltage is V o = I o *(R15+R16).
[0019] The three bias diodes D1, D2, and D3 in the current amplifier play the role of weak forward biasing the output stage, so that the output stage can be in a Class A and B working state. The transistor T1 improves the driving ability and provides output power for the transistor T3. Transistor T2 and resistors R6, R7, and R8 form a constant current source circuit to stabilize the bias current. R15, R16 and R2 form a parallel current negative feedback loop. R15 is the sampling resistor, and R16 is the newly added sampling resistor. Adjusting R2 can change the gain of the current amplifier.
[0020] In this device, a negative feedback loop is adopted, an NMOS tube switch is added to control, a new sampling resistor is added, and the resistance of the original sampling resistor is changed. As a result, the current amplifier has strong stability, reduces the power loss of the current amplifier, improves the sampling accuracy of the current amplifier, and increases the maximum output current of the current amplifier.

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Description & Claims & Application Information

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