CN203813678U - An Automatic Adjustable High Voltage DC Power Supply - Google Patents

Abstract

The utility model discloses an automatically adjustable high-voltage direct-current power supply, which relates to the technical field of high-voltage direct-current power supplies. It includes autotransformer, step-up transformer, rectifier and filter unit, signal acquisition unit, control unit, motor driver, voltage regulating motor and man-machine interface, the output end of autotransformer is connected to the input end of step-up transformer, and the The output terminal is connected to the input terminal of the rectification and filtering unit, and the output terminal of the rectification and filtering unit is connected to the signal acquisition unit. coupling transformer. The utility model has simple structure and reasonable design, can generate smooth and adjustable high-voltage direct current voltage, and can be applied to various occasions that require high adjustable direct current, especially to realize automation and stability for the production detection of the control board of the drive unit of the high-voltage frequency converter. Reliable, improving production efficiency.

Description

An Automatic Adjustable High Voltage DC Power Supply

technical field

The utility model relates to the technical field of high voltage direct current power supply, in particular to an automatically adjustable high voltage direct current power supply.

Background technique

The high-voltage DC power supply is a power supply that is input by AC mains or three-phase power and outputs a DC voltage of more than thousands of volts or tens of thousands of volts. Generally, it can stabilize voltage or current. The traditional high-voltage DC power supply uses AC mains or three-phase power. The phase power is boosted by a power frequency high-voltage transformer into AC high-voltage power, and then high-voltage direct current is obtained through rectification and filtering.

For the commonly used DC-DC DC Buck circuit (Figure 3) to output variable DC voltage, where the maximum output voltage of V _{out_max} ≤ V _in is less than or equal to the input voltage, in order to obtain a higher output voltage, the corresponding input voltage also needs to be higher, In this way, when the Q tube is turned off, it must withstand the high voltage from the bus. We know that the rated voltage of the selected switching tube needs to be 2-3 times the input voltage. If the output voltage is DC1000V, the rated voltage of the switching tube is required to be DC2000-3000V. This undoubtedly increases the cost and reliability of the switch tube.

For the commonly used DC-DC DC Boost circuit (Figure 4) to output a variable DC voltage, this circuit has a boost function. The high voltage is mainly due to the sudden change in the current of the inductor L. When the inductance is fixed, the voltage increase must be accelerated. The turn-off speed and frequency of the switching tube Q, when it is necessary to output a higher power high voltage, the switching loss of Q increases rapidly. At this time, a higher power Q tube needs to be selected, which increases the cost and reduces the conversion efficiency of the system.

Due to the low frequency of the traditional high-voltage DC power supply, coupled with the relatively large volume and weight of the power supply, its conversion efficiency and stability are poor. A continuously adjustable high-voltage DC power supply is obviously beyond the reach of the traditional high-voltage DC power supply, so designing an automatically adjustable high-voltage DC power supply is still very promising.

Contents of the invention

Aiming at the deficiencies in the prior art, the purpose of this utility model is to provide an automatically adjustable high-voltage DC power supply, which has a simple structure and a reasonable design, can generate smooth and adjustable high-voltage DC voltage, and the output voltage can be set through the man-machine interface , can be applied to various occasions that require high adjustable direct current, especially for the automation of the production and inspection of the control board of the drive unit of the high-voltage frequency converter, which is stable and reliable, and improves the production efficiency.

In order to achieve the above purpose, the utility model is realized through the following technical solutions: an automatically adjustable high-voltage DC power supply, including an autotransformer, a step-up transformer, a rectifier filter unit, a signal acquisition unit, a control unit, a motor driver, Voltage regulating motor and man-machine interface, the input end of the autotransformer is connected to 220V AC, the output end of the autotransformer is connected to the input end of the step-up transformer, the output end of the step-up transformer is connected to the input end of the rectifier filter unit, and the rectifier filter unit The output terminal is connected to the signal acquisition unit, the signal acquisition unit and the man-machine interface are connected to the control unit, the control unit is connected to the voltage regulating motor through the motor driver, and the voltage regulating motor is connected to the autotransformer.

Preferably, a voltage regulating motor is installed on the voltage regulating shaft of the autotransformer.

The utility model has the beneficial effects: simple structure, reasonable design, can generate smooth and adjustable high-voltage DC voltage, the output voltage can be set through the man-machine interface, and can be applied to various occasions requiring higher adjustable DC voltage, especially for high-voltage The production inspection of the inverter drive unit control board is automated, stable and reliable, and the production efficiency is improved.

Description of drawings

The utility model is described in detail below in conjunction with accompanying drawing and specific embodiment;

Fig. 1 is a structural block diagram of the utility model;

Fig. 2 is a circuit diagram of the utility model;

Fig. 3 is the BUCK step-down circuit diagram of the utility model background technology;

Fig. 4 is a BOOST boosting circuit diagram of the background technology of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific embodiments.

Referring to Figures 1-4, this specific embodiment adopts the following technical solutions: an automatically adjustable high-voltage DC power supply, including an autotransformer 1, a step-up transformer 2, a rectification and filtering unit 3, a signal acquisition unit 4, a control unit 5, Motor driver 6, voltage regulating motor 7 and man-machine interface 8, the input terminal of autotransformer 1 is connected to 220V AC, the output terminal of autotransformer 1 is connected to the input terminal of step-up transformer 2, and the output terminal of step-up transformer 2 is connected to rectifier The input end of the filter unit 3, the output end of the rectification filter unit 3 are connected to the signal acquisition unit 4, the signal acquisition unit 4 and the man-machine interface 8 are all connected to the control unit 5, and the control unit 5 is connected to the voltage regulating motor 7 through the motor driver 6, The voltage regulating motor 7 is connected to the autotransformer 1 .

It should be noted that a voltage regulating motor 7 is installed on the voltage regulating shaft of the autotransformer 1 .

In this specific embodiment, the mains AC220V is input, and the voltage is regulated through the autotransformer 1, wherein the voltage regulation adopts the voltage regulating motor 7 to drive the voltage regulating shaft to realize automatic voltage regulation, and the autotransformer 1 and the step-up transformer 2 are connected in series to realize voltage regulation and boosting. That is, the output of autotransformer 1 is connected to the input of step-up transformer 2. Autotransformer 1 can realize high-power output, and the step-up transformer 2 can also achieve high-power output in the step-up part. The output high voltage is mainly controlled by the step-up transformer. The transformation ratio of the transformer 2 is realized. This method outputs less high-voltage harmonic content, and smooth direct current can be obtained after rectification and filtering; the voltage regulation part uses the controller in the control unit 5 to control the rotation of the voltage regulation motor 7 to drive the autotransformer 1. The pressure regulating shaft rotates and regulates the pressure to realize the digital control of the pressure regulation. The direction and speed of the voltage regulating motor 7 are controlled by the main controller. The algorithm adopts PID. The voltages are compared, and then the compared values are subjected to the PID algorithm to control the voltage regulating motor 7 to run quickly and accurately to the set voltage value.

This specific embodiment has a simple structure and reasonable design, and can generate smooth and adjustable high-voltage DC voltage. The output voltage can be set through the man-machine interface, and can be applied to various occasions that require high adjustable DC power, especially for high-voltage inverter drives. The production inspection of the unit control board is automated, stable and reliable, and the production efficiency is improved.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (2)

1. an automatic adjustable high-voltage DC power supply, it is characterized in that, comprise autotransformer (1), step-up transformer (2), rectification filtering unit (3), signal gathering unit (4), control unit (5), motor driver (6), pressure regulation motor (7) and man-machine interface (8), the input termination 220V alternating current of autotransformer (1), the input of the output termination step-up transformer (2) of autotransformer (1), the input of the output termination rectification filtering unit (3) of step-up transformer (2), the output termination signal gathering unit (4) of rectification filtering unit (3), signal gathering unit (4), man-machine interface (8) is all connected with control unit (5), control unit (5) is connected with pressure regulation motor (7) by motor driver (6), pressure regulation motor (7) connects autotransformer (1).

2. a kind of adjustable high-voltage DC power supply automatically according to claim 1, is characterized in that, on the pressure regulating axis of described autotransformer (1), pressure regulation motor (7) is installed.