CN203225667U

CN203225667U - High-power-factor low-ripple electrophoretic coating rectifying device

Info

Publication number: CN203225667U
Application number: CN 201320185640
Authority: CN
Inventors: 王献亮
Original assignee: BAODING NIER CONVERTER Co Ltd
Current assignee: BAODING NIER GROUP RECTIFIER CO., LTD.
Priority date: 2013-04-15
Filing date: 2013-04-15
Publication date: 2013-10-02
Anticipated expiration: 2023-04-15

Abstract

The utility model discloses a high-power-factor low-ripple electrophoretic coating rectifying device, comprising two sets of output ends which are isolated and cophasal of a three-phase transformer, wherein the two sets of output ends are respectively connected with three-phase fully controlled bridges, the two sets of three-phase fully controlled bridges are connected in series to output a direct current voltage, a rectifier diode is respectively forwardly connected between two ends of output ends of the two sets of three-phase fully controlled bridges, thyristor gate poles of the two sets of three-phase fully controlled bridges are connected with a controller, so as to form a power supply in the form of three-shift coarse adjustment and thyristor fine adjustment. The power supply meets the requirement that the device always operates in a high-power-factor low-ripple state at any moment during the process of high voltage and low voltage segment-based electrophoresis technology, and realizes output of the any high/low voltage, and realizes noncontact on-line automatic switching, thereby solving the problem that the power factor is low when the power supply operates, and raising a utilization rate of the power supply.

Description

A kind of High Power Factor hangs down ripple electrophoretic painting rectifying device

Technical field

The utility model relates to the low ripple electrophoretic painting rectifying device of a kind of High Power Factor.

Background technology

Electrophoretic coating is generally about 400V with the rectifier DC electric pressure at present; but the scene may be operated in tens volts to arbitrary value between rated value according to technological requirement; so operating voltage changes greatly; rectifier is operated in dark control state through regular meeting; power factor is very low; if uneasy prosthetics device; probably imposed a fine by electric power system or collect the electricity charge by apparent power; can bring no small loss to enterprise; and because dark control; direct current output ripple composition is bigger, can reduce the electrophoresis quality greatly, and is relatively poor etc. such as glossiness.Some high-end top orders can increase the influence that tap reduces this respect at the transformer primary side at present, raising function factor that can be suitable, but when being applied in different workpiece, during different technological parameter, voltage will require difference, sometimes require 120V such as certain scene, sometimes require 260V, can not stop line in process of production and transfer tap, can't realize charged switching tap again, generally tap can only be transferred to the shelves greater than 260V, will occur the state of dark control when being operated in 120V, problem will compare seriously, can only increase dynamic compensating device or transformer and add the loaded switch adjustment, it is all higher to increase compensation arrangement or loaded switch expense, has increased equipment cost.

The utility model content

The technical problems to be solved in the utility model provides the low ripple electrophoretic painting rectifying device of a kind of High Power Factor, and it has power utilization rate height, power output is big, voltage stability is high, ripple is little and voltage characteristics such as adjustable continuously.

For solving the problems of the technologies described above, technical solution adopted in the utility model is: isolate and synchronous output for two groups that comprise three-phase transformer, two groups of outputs connect three-phase full-controlled bridge respectively, two groups of three-phase full-controlled bridges output dc voltage that is in series, each forward connects a rectifier diode between the output two ends of two groups of three-phase full-controlled bridges, the gate circuit transistor gate of two groups of three-phase full-controlled bridges is connected with controller, forms third gear coarse adjustment and thyristor fine tuning mode power supply.

The utility model further improves and is: third gear coarse adjustment and thyristor fine tuning mode power supply be two groups and be in parallel, and overlap controller and be connected with one, and the transformer output phase difference of two groups of parallel connection power supplies is 30 °; The ratio of two three-phase transformer secondary coil output voltages is 1: 2.

The beneficial effect that adopts technique scheme to produce is: this power supply by control two three-phase full-controlled bridges work respectively or tandem working can realize that three kinds of electric pressures automatically switch and exports by the overlapped in series mode, thereby the no disturbance that realizes output voltage is adjustable continuously, widen the adjusting range of voltage, thereby satisfy electrophoretic coating fully the requirement of power supply has been improved product quality; Power supply is realized 12 pulse wave rectifiers by the device of two phase differences, 30 degree is in parallel, thereby has eliminated 5,7 subharmonic, has reduced the ripple interference, has further improved the stability of power supply output, has improved the power output of power supply simultaneously; The ratio of three-phase transformer secondary coil output voltage is 1: 2, if direct current output less than first grade 33% o'clock, then only start a rectifier bridge that output voltage is less; If direct current output greater than first grade 33% and less than second grade 67% o'clock, then only start the bigger rectifier bridge of output voltage; If direct current output greater than second grade 67% o'clock, two rectifier bridges simultaneously then, reasonably power supply collocation can be changed voltage arbitrarily between three shelves commonly used, also can realize contactless automatic switchover.

Therefore, this power supply satisfies the state that in low pressure, high-pressure subsection electrophoresis process process arbitrary moment equipment all is operated in the low ripple of High Power Factor fully.Solve power supply power factor problem on the low side when work, improved the utilance of power supply, improved the electrophoretic painting quality.

Description of drawings

Fig. 1 is the structural representation of third gear coarse adjustment and thyristor fine tuning mode power supply in the utility model;

Fig. 2 is the structural representation that two groups of third gear coarse adjustment and thyristor fine tuning mode power supply are in parallel;

Fig. 3 is the control principle block diagram of Fig. 2.

Embodiment

By the embodiment shown in Fig. 1-3 as can be known, isolate and synchronous output for two groups that comprise three-phase transformer, two groups of outputs connect three-phase full-controlled bridge respectively, two groups of three-phase full-controlled bridges output dc voltage that is in series, each forward connects a rectifier diode between the output two ends of two groups of three-phase full-controlled bridges, the gate circuit transistor gate of two groups of three-phase full-controlled bridges is connected with controller, controller comprises double loop adjuster and the connected voltage regulating module that is output as the PID analog signal, the voltage regulating module output signal is connected with two groups of three-phase full-controlled bridges respectively, (controller can also be by mainly being finished by single-chip microcomputer, be combined with signal synchronization circuit, trigger impulse forms circuit, pulse power amplifier circuit is formed, and pulse power amplifier circuit is connected with two groups of three-phase full-controlled bridges respectively) composition third gear coarse adjustment and thyristor fine tuning mode power supply; Third gear coarse adjustment and thyristor fine tuning mode power supply be two groups and be in parallel, and be connected with a cover controller, and the transformer output phase difference of two groups of parallel connection power supplies is 30 °; Form 12 pulse wave rectifiers, eliminated 5,7 subharmonic, the ratio of two three-phase transformer secondary coils output output voltages is 1: 2, if direct current output during less than rated value 33%, then only starts 1# rectifier bridge (1VT1-1VT6), and exports by D12; If when direct current is exported greater than rated value 33% and less than rated value 67%, then only start 2# rectifier bridge (2VT1-2VT6), and export by D11; When if direct current is exported greater than rated value 67%, then start 1# and 2# rectifier bridge simultaneously, export by two bridge overlapped in series modes, thereby realize any high low-voltage output, realize contactless automatic switchover, controller by signal synchronization circuit, trigger impulse form circuit, pulse power amplifier circuit is formed, pulse power amplifier circuit is connected with two groups of three-phase full-controlled bridges respectively.

Third gear coarse adjustment and thyristor fine tuning mode power supply can also be that many groups are in parallel, if two groups of parallel connections then two groups phase difference be 30 ° of composition 12 pulse wave rectifiers; If three groups of parallel connections then three groups phase difference be 20 ° and consist of 18 pulse wave rectifiers; If four groups then phase difference consist of 24 pulse wave rectifiers by that analogy for 15 °.

Operation principle:

According to producing needs to making corresponding magnitude of voltage, output voltage is through the feedback generation deviation signal of comparing with given magnitude of voltage, this signal is exported to the double loop voltage regulator, double loop voltage regulator output control electric current is controlled the operating state of two three-phase full-controlled bridges respectively, thereby make voltage export surely in given magnitude of voltage, to ensure the quality of electrophoretic painting.

Claims

1. a High Power Factor hangs down ripple electrophoretic painting rectifying device, it is characterized in that: isolate and synchronous output for two groups that comprise three-phase transformer, described two groups of outputs connect three-phase full-controlled bridge respectively, described two groups of three-phase full-controlled bridges output dc voltage that is in series, each forward connects a rectifier diode between the output two ends of two groups of three-phase full-controlled bridges, the gate circuit transistor gate of described two groups of three-phase full-controlled bridges is connected with controller, forms third gear coarse adjustment and thyristor fine tuning mode power supply.

2. a kind of High Power Factor according to claim 1 hangs down ripple electrophoretic painting rectifying device, it is characterized in that described third gear coarse adjustment and thyristor fine tuning mode power supply are two groups and are in parallel, and be connected with a cover controller, the transformer output phase difference of described two groups of parallel connection power supplies is 30 °.

3. a kind of High Power Factor according to claim 2 hangs down ripple electrophoretic painting rectifying device, and the ratio that it is characterized in that described two three-phase transformer secondary coil output voltages is 1: 2.