CN201854182U

CN201854182U - Voltage source of relay protection test instrument

Info

Publication number: CN201854182U
Application number: CN201020570246XU
Authority: CN
Inventors: 胡兵
Original assignee: Suntech Power Technology (nanjing) Co Ltd
Current assignee: Suntech Power Technology (Nanjing) Limited by Share Ltd
Priority date: 2010-10-21
Filing date: 2010-10-21
Publication date: 2011-06-01
Anticipated expiration: 2020-10-21

Abstract

The utility model relates to a voltage source of a relay protection test instrument, which comprises an H bridge switch amplifier, wherein the center points of a No.2 triode and a No.4 triode of the H bridge switch amplifier are connected with a No. 1 inductor and are then connected in series with a No.2 resistor, next, a No.3 inductor and a No.1 resistor are connected in series to an output end, the center points of a No.1 triode and a No.3 triode of the H bridge switch amplifier are connected with a No.2 inductor and are then connected in series with a No.3 resistor, next, a No.3 inductor is connected in series to the other end of an output, a No.1 capacitor is connected in parallel between a connecting point of the No.2 resistor and the No.3 inductor and a connecting point of the No.3 resistor and the No.3 inductor, a No.2 capacitor is connected in parallel between an output end point of the No.2 resistor and the No.3 inductor and an output end point of the No.3 resistor and the No.3 inducer, a connecting point of the No.2 resistor and the No.3 inductor is connected with a No.4 capacitor to the ground, a connecting point of the No.3 resistor and the No.3 inductor is connected with the No.3 capacitor to the ground, and a No.4 inductor and a No.5 capacitor are connected in series between two pins of the No.3 inductor. The size and the cost of the voltage source are reduced, the efficiency is improved, and the large-scale production is conveniently realized.

Description

A kind of relay-protection tester voltage source

Technical field

The utility model relates to a kind of power amplifier, is a kind of relaying protection measuring instrument voltage source specifically.

Background technology

One employing of voltage source " Switching Power Supply+linear amplifier " pattern in the present relay-protection tester device; this pattern has certain advantage when small-signal is exported; but when high-power output, there is defective; efficient is low; has only 30-50%; and linear amplifier exists the debugging problem of working points at different levels; be unfavorable for producing in enormous quantities; if current source adopts " Switching Power Supply+switching amplifier " pattern; then can raise the efficiency 75-90%; and switching amplifier one do not need complicated debugging to get final product operate as normal, be particularly suitable for large-scale production.Yet switching amplifier output filter circuit design is very important, and is improper if the circuit of design and parameter are provided with, and can have switching signal and electromagnetic interference signal at the output of amplifier, causes the output waveform variation.

Summary of the invention

Goal of the invention: the purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of relay-protection tester voltage source is provided, and it can overcome, and existing voltage source volume is big, cost is high, defective that can't large-scale production.

In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme: a kind of relay-protection tester voltage source, it comprises H bridge switch amplifier, the mid point of its No. two triodes, No. four triodes connects inductance No. one, go here and there resistance again No. two, connect No. three inductance and a resistance are to output again; The mid point of a triode of H bridge switch amplifier, No. three triodes connects inductance No. two, goes here and there resistance again No. three, No. three inductance other end to output of connecting again; An electric capacity in parallel between the tie point of the tie point of No. two resistance, No. three inductance and No. three resistance, No. three inductance; The exit point and the di-electric capacity of the exit point of No. two resistance, No. three inductance and No. three resistance, No. three inductance; The tie point of No. two resistance and No. three inductance connects No. four electric capacity to ground, and the tie point of No. three resistance and No. three inductance connects No. three electric capacity to ground, and No. four inductance and No. five capacitances in series are connected between the bipod of No. three inductance.

Wherein, described No. three inductance are four pin inductance; No. two resistance connect 1 pin of four pin inductance, and No. three resistance connect 3 pin of four pin inductance; No. four inductance and No. five capacitance series are between 2 pin and 4 pin of four pin inductance.

Beneficial effect: the utility model has dwindled volume, has improved efficient, has reduced cost, is convenient to large-scale production; And purified output waveform, output effect is good.

Description of drawings

Be illustrated as circuit connection diagram of the present utility model.

Embodiment:

Below in conjunction with accompanying drawing the utility model is done further explanation.

Voltage source in the relay-protection tester device of the present utility model adopts Switching Power Supply+switching amplifier pattern, and wherein switching amplifier adopts the H bridge circuit.

As shown in the figure; relay-protection tester voltage source of the present utility model, it comprises H bridge switch amplifier, the mid point of No. two triode Q2 of H bridge switch amplifier, No. four triode Q4 connects inductance L 1 No. one; go here and there resistance R 1 again No. two, connect No. three inductance L 3 and a resistance R 1 are to output again.Described No. three inductance L 3 are four pin inductance.No. two resistance R 2 connect 1 pin of No. three inductance L 3.

The mid point of a triode Q1 of H bridge switch amplifier, No. three triode Q3 connects inductance L 2 No. two, goes here and there resistance R 3 again No. three, and 1 pin of No. three inductance L 3 of connecting again is to the other end of output; A capacitor C 1 in parallel between the tie point of the tie point of No. two resistance R 2, No. three inductance L 3 and No. three resistance R 3, No. three inductance L 3; The exit point and the di-capacitor C 2 of the exit point of inductance L 1, No. three inductance L 3 and No. two inductance L 2, No. three inductance L 3; The tie point of No. two resistance R 2 and No. three inductance L 3 connects No. four capacitor C 4 to ground, and the tie point of No. three resistance R 3 and No. three inductance L 3 connects No. three capacitor C 3 to ground, and No. four inductance L 4 and No. five capacitor C 5 series connections are between 2 pin and 4 pin of No. three inductance L 3.

Inductance L 1 among the figure, No. two inductance L 2 and a capacitor C 1 are used for reducing differential mode interference, and No. three inductance L 3, No. three capacitor C 3 and No. four capacitor C 4 are used for reducing common mode disturbances, No. two inductance L 2 of an inductance L 1=wherein, 4, No. two resistance R 2 of No. four capacitor C of No. three capacitor C 3=and No. three resistance R 3 prevent the higher-order of oscillation for being connected in the outlet line, No. four inductance L 4 and No. five capacitor C 5 are for being connected in parallel on the filtering compensation network of output.

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

Claims

1. a relay-protection tester voltage source is characterized in that, it comprises H bridge switch amplifier, and the mid point of its No. two triodes, No. four triodes connects inductance No. one, goes here and there resistance again No. two, and connect No. three inductance and a resistance are to output again; The mid point of a triode of H bridge switch amplifier, No. three triodes connects inductance No. two, goes here and there resistance again No. three, No. three inductance other end to output of connecting again; An electric capacity in parallel between the tie point of the tie point of No. two resistance, No. three inductance and No. three resistance, No. three inductance; The exit point and the di-electric capacity of the exit point of No. two resistance, No. three inductance and No. three resistance, No. three inductance; The tie point of No. two resistance and No. three inductance connects No. four electric capacity to ground, and the tie point of No. three resistance and No. three inductance connects No. three electric capacity to ground, and No. four inductance and No. five capacitances in series are connected between the bipod of No. three inductance.

2. a kind of relay-protection tester voltage source according to claim 1 is characterized in that, described No. three inductance are four pin inductance; No. two resistance connect 1 pin of four pin inductance, and No. three resistance connect 3 pin of four pin inductance; No. four inductance and No. five capacitance series are between 2 pin and 4 pin of four pin inductance.