CN203491881U

CN203491881U - DC bleeder circuit

Info

Publication number: CN203491881U
Application number: CN201320480831.4U
Authority: CN
Inventors: 索红亮; 娄丽丽
Original assignee: LANGFANG IN-POWER ELECTRIC Co Ltd; BEIJING IN-POWER ELECTRIC Co Ltd
Current assignee: BEIJING IN-POWER ELECTRIC Co Ltd; BEIJING IN-POWER NEW ENERGY Co Ltd; LANGFANG IN-POWER ELECTRIC Co Ltd
Priority date: 2013-08-07
Filing date: 2013-08-07
Publication date: 2014-03-19
Anticipated expiration: 2023-08-07

Abstract

The utility model provides a DC bleeder circuit, which comprises a binding post J1, a switch tube M1, a drive circuit and a voltage stabilizing circuit. The drive circuit is composed of a resistor R3, a resistor R4, a resistor R5, a resistor R7, a diode D4, a capacitor C3, a capacitor C4, a light emitting diode D2, an opto-isolator chip U1 and a resistance voltage stabilizing tube D5. The voltage stabilizing circuit is composed of a diode D1, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a voltage stabilizing tube D3. The circuit is small in size, lower in cost and space-saving, wherein elements are flexibly designed. Meanwhile, due to the adoption of the DC bleeder circuit, corresponding requirements can be met through adjusting the parameters of relevant elements according to different voltage classes. A control part and a high-voltage part are isolated from each other by means of an optical coupler, and the isolation effect is good. Moreover, the anti-interference performance of the circuit is improved, and the reliability of the system is greatly enhanced. Due to the adoption of a MOSFET as a switch tube, the circuit is fast in switching speed, small in driving power, wide in safety working range, strong in overload capacity, small in leakage current, high in noise margin and excellent in anti-interference capability.

Description

Direct current leadage circuit

Technical field:

The utility model belongs to power quality controlling and power saving device is manufactured field, relates in particular to a kind of leadage circuit of the PWM of being applied to current transformer direct-current discharge.

background technology:

Along with the development of modern power electronics technology, microelectric technique and computer technology, the PWM technology of take has obtained more and more widely application as basic power conversion unit.PWM current transformer has the advantages such as High Power Factor, low harmonic pollution, energy in bidirectional flow, low capacity energy storage link, constant dc pressure-controlled, in fields such as electric power system active power filtering, reactive power compensation, trend control, solar power generation and alternating current-direct current drive systems, there is more and more wide application prospect.

There is following problem in traditional leadage circuit:

1, can adopt high voltage, the Control of large electric current, but this scheme cost is high, and volume is large, is not easy to install;

2, select the larger bleeder resistance of resistance value ratio to be connected to DC side, guiding discharge speed is very slow, and this resistance is always in consumed power, and caloric value is very large, affects the efficiency of PWM current transformer;

summary of the invention:

In order to address the above problem, the purpose of this utility model is to provide a kind ofly has that volume is little, cost is low, stability advantages of higher, and can change as required the voltage withstand class of components and parts, to be applied to the direct current leadage circuit of different occasions.

The technical solution of the utility model is: direct current leadage circuit, and this circuit comprises binding post J1, switching tube M1, is used to switching tube M1 that the drive circuit of gate electrode drive signals is provided and is used to light-coupled isolation chip U1 secondary that supply power voltage VCC voltage stabilizing circuit is provided:

Wherein, described drive circuit comprises resistance R 3, R4, R5, R7, diode D4, capacitor C 3, C4, light-emitting diode D2, light-coupled isolation chip U1 and resistance voltage-stabiliser tube D5; Voltage stabilizing circuit comprises diode D1, resistance R 1, R2, capacitor C 1, C2 and voltage-stabiliser tube D3;

Wherein, the 4th pin of binding post J1 is connected to one end of resistance R 3, the negative electrode of the other end of described resistance R 3 and diode D4, one end of R7, one end of capacitor C 3 is connected with the anode of light-coupled isolation chip light emitting diode D2, the negative electrode of described light-emitting diode D2 is connected with first pin of light-coupled isolation chip U1, second pin of light-coupled isolation chip U1 and the other end of capacitor C 3, the other end of R7, the anode of diode D4 is connected to the 3rd pin of binding post J1, the 3rd pin of light-coupled isolation chip U1 is connected to one end of resistance R 4, one end of the other end of resistance R 4 and resistance R 5, the negative electrode of resistance voltage-stabiliser tube D5, one end of capacitor C 4, second pin of switching tube M1 connects, the other end of resistance R 5, the anode of resistance voltage-stabiliser tube D5, the other end of capacitor C 4 is connected with the 3rd pin of switching tube M1, the 3rd pin of switching tube M1 and one end of capacitor C 1, the negative pole of capacitor C 2, the anodic bonding of voltage-stabiliser tube D3 is to GND, and then be connected to first pin of J1, the negative electrode of voltage-stabiliser tube D3, one end of the positive pole of capacitor C 2 and resistance R 2 is connected to VCC, and then be connected to the 4th pin of light-coupled isolation chip U1, the other end of resistance R 2 is connected with one end of resistance R 1, the negative electrode of the other end of resistance R 1 and diode D1, the other end of capacitor C 1 is connected, first pin of the anode of diode D1 and switching tube M1 is connected to second pin of binding post J1 jointly.

the beneficial effects of the utility model are:

1, to have volume little for this circuit, reduced cost, saved design space, and element design is flexible, can just can reach corresponding demand according to the different corresponding device parameters of electric pressure adjustment.

2, this circuit control section and high-pressure section adopt optocoupler to separate, isolation effective, and interference free performance improves, and has greatly strengthened the reliability of system;

3, select MOSFET as switching tube, to there is the advantages such as the speed of opening is fast, driving power is little, safety operation area field width, overload capacity is strong, leakage current is little, there is very high noise margin and antijamming capability.

figure of description:

Fig. 1 is electrical block diagram of the present utility model.

Fig. 2 is that the utility model is at PWM rectifier application schematic diagram.

embodiment:

Below in conjunction with the drawings and specific embodiments, the technical solution of the utility model is described further.

As shown in Figure 1, the utility model direct current is released, and this circuit comprises binding post J1, switching tube M1, is used to switching tube M1 that the drive circuit of gate electrode drive signals is provided and is used to light-coupled isolation chip U1 secondary that supply power voltage VCC voltage stabilizing circuit is provided:

Wherein, described drive circuit comprises resistance R 3, R4, R5, R7, diode D4, capacitor C 3, C4, light-emitting diode D2, light-coupled isolation chip U1 and resistance voltage-stabiliser tube D5;

Voltage stabilizing circuit comprises diode D1, resistance R 1, R2, capacitor C 1, C2 and voltage-stabiliser tube D3;

As shown in Figure 2, the utility model is applied in 70KW active filter:

Concrete wiring rules is: first pin of J1 is connected to one end of bleeder resistance R6, the other end of R6 is connected to DC-(DC master row negative voltage side), second pin of J1 is connected to DC+ (DC master row positive voltage terminal), the 3rd pin of J1 received the GND of 24V, and the 4th pin of J1 received above 24V.

In circuit, the Main Function of D4 is to prevent that 24V reverse power connection from causing the damage of other components and parts, the Main Function of R7 and C3 is to prevent that interference signal from causing U1 to open by mistake and leading to and damage bleeder resistance and switching tube M1, the Main Function of D2 is signal designation, because the gate drive voltage of switching tube M1 has input range, therefore adopt resistance R 4, the mode of R5 series connection dividing potential drop is supplied with gate electrode drive signals, R5 and C4 parallel connection simultaneously can strengthen antijamming capability, for further safety assurance, gate pole shunt regulator tube D5 at switching tube M1, guarantee that gate voltage can not surpass higher limit, in figure, the effect of D1 is to prevent the positive and negative reversal connection of direct voltage, avoid causing other element cisco unity malfunctions, resistance R 1, the effect of R2 is the electric current of restriction voltage-stabiliser tube D3 branch road, guarantee that D3 normally works, in addition to also have the output supply power voltage that an advantage is optocoupler be to provide by voltage stabilizing circuit to this circuit, needn't provide in addition power supply to power to it.

The concrete course of work is, the concrete course of work is, when leadage circuit plate is received direct current two ends, voltage stabilizing branch road provides supply power voltage can to light-coupled isolation chip U1 secondary, capacitor C 2 also can be stored certain electric energy simultaneously, after control board provides 24V control signal, D2 is lit, now light-coupled isolation chip U1 is open-minded, then signal is through R4, R5 bleeder circuit makes switching tube M1 conducting, direct voltage two ends can be linked together by resistance R 6 like this, by resistance R 6, consume the energy at direct current two ends like this, when DC voltage value is lower than voltage stabilizing circuit output valve time, now can continue by the energy of capacitance stores to power to light-coupled isolation chip U1 secondary, keep light-coupled isolation chip U1 to open, can guarantee that like this R6 thoroughly consumes DC energy.

Passage 2 is 24V control signal, and passage 1 is the voltage between first pin of J1 terminal and second pin, above known, after 24V control signal is given, and switching tube M1 conducting immediately.

Above an embodiment of the present utility model is had been described in detail, but described content is only preferred embodiment of the present utility model, can not be considered to for limiting practical range of the present utility model.All equalization variations of doing according to the utility model application range and improvement etc., within all should still belonging to patent covering scope of the present utility model.

Claims

1. direct current leadage circuit, is characterized in that, this circuit comprises binding post J1, switching tube M1, is used to switching tube M1 that the drive circuit of gate electrode drive signals is provided and is used to light-coupled isolation chip U1 secondary that supply power voltage VCC voltage stabilizing circuit is provided: