TW561664B - Elimination method of the discontinuous excitation current in AC power - Google Patents

Abstract

An elimination method of the discontinuous excitation current in AC power is disclosed, wherein a control software is used for operation cooperatively, so that the off/on voltage waveform can reach the balance state. Thus, the relative magnetic hysteresis curve will be balanced, so as not to generate a very large excitation current.

Description

^ 61664 V. Description of the invention d) [Field of the invention] The present invention is a method for eliminating AC current on the main brake field when the AC power supply is cut off. 爻 疋 Use the corresponding angle to connect Fang Li Ling + cycle of the cycle of the waveform gradually. It happens that the positive and negative values of the power-down cycle are low. This method can make the generated exciting current drop [Known Technology], 1 =! Source supplier is to provide equipment with uninterrupted protection. When the power is interrupted and transferred to the internal battery to supply power, : Fixed time connection mode or fixed period connection. 2 四 所 #, the method used for fixed time is not to consider the mains interruption, and the fixed time is based on the mains interruption time. The CPU uses the PLL line to determine the mains interruption point to calculate the interruption angle. ”] Corresponding connection. The fixed cycle connection method is to compare the angle preset by the angle disc of the mains power failure, to determine whether the connected cycle is a positive half-adjustment of 0 degrees or 180 degrees connection. Thousand week negative + Week, please refer to Figure 5a ~ e. Figures ^ m ^,., Figure a is a preset angle wave for judgment. ^ Figure 'The preset angle is set in both positive and negative half cycles. The situation is roughly divided into four types. In Figure 5b, the mains power is cut off during the positive half-cycle, and the angle is smaller than the preset angle Xiao Xiao. Continuation in the form of half a week. In Fig. 5C, 'is the angle when the mains power is cut off during the positive half-cycle, and the mains power is cut off.

Page 4 561664 V. Description of the invention (2) When the degree is larger than the preset angle, the right-side connection is continued. 、] At the position of 180 °, the DC is negative half-cycle in Figure 5d. In the negative half-cycle, the mains power is cut off, and when the market is smaller than the preset angle, it is connected at the angle of 3βη sound power off. . Only] In the position of 360 degrees, DC has a negative half-cycle shape in Figure 5e. The mains power is cut off at a negative half-cycle. When the degree is greater than the preset angle, the angle of 3finling & Style continuation.丨 DC at 36G degrees: in the shape of a positive half cycle, so at a fixed time, although it can confirm the power failure, its power failure is connected to ㈤— 社 彳 Π 市 电 々 d 1 It can be fixed from only the guard, but its relay in the system is not switched at zero power, which will reduce "" life, reduce reliable production. The fixed cycle connection can ensure the life of the relay, but its power-off connection time cannot be changed according to the different power-off angles, and the maximum is close to half a cycle. And whether it is a fixed-time connection or a fixed-cycle connection, its nv Balance will shift due to the unbalance of the positive and negative half-cycles during this power-off cycle, causing AVR saturation, causing the AC-DC conversion current to be too large, and breakdown m. sfET caused system damage. The inventor of the present case needs to be improved in view of the ineffectiveness caused by the conventional processing method. 'After a long time of thinking and research, he finally developed the method for eliminating the intermittent excitation current of the AC power supply of the present invention. [Objective of the Invention] The method for eliminating intermittent excitation current of AC power according to the present invention is mainly

561664 V. Description of the invention (3) '' ---- The purpose is to reduce the exciting current generated during AC-DC conversion and further maintain the reliability of the equipment. And the corresponding angle connection method can be used to balance the positive and negative half-cycles during the power-off cycle. Its Inv terminal 乂 nv Balance is not offset, and the conversion current is reduced to protect the AVR τχ from saturation. [Summary of the Invention]

A method for eliminating intermittent excitation current of AC power supply is characterized in that the intermittent and continuous voltage waveforms are balanced using command control, and the hysteresis curve will also be balanced without generating a large magnetizing current. The execution steps are as follows: a. Detecting the mains power failure signal; b. Extracting the mains power off waveform angle position; c. Compensating the detection action time of the previous step; d. Rectifier opening angle value update action; e. Calculate the mains cycle and voltage; f · Phase-locked loop meter nose and internal synchronization frequency adjustment;

By the above steps, the input / output voltage waveforms before and after power off are balanced. [Preferred embodiment] As the switching power supply uses high-frequency switching technology, with the pulse wave modulation (PWM) and output chirp circuit, it can convert the commercial power into the DC voltage required by the IC circuit, for example: + 5V,-5V, H2V, 12V, + 3_ 3V

561664 Invention description (4) Equivalent voltage, but the side effect after this conversion is that there is a little noise in the DC component. If this noise is too large and exceeds the allowable error range, it will cause the application circuit to malfunction. It may malfunction or crash, so the influence of output noise is not small. The method of the present invention controls the balance of the waveform output to reduce noise generation as a solution. Please refer to FIG. 1 for a flowchart of a method for eliminating intermittent excitation current of an AC power source according to the present invention. This method adopts the principle of corresponding angle continuation. In the software design part, we use instruction control to balance the positive and negative half-cycle periods in the power-off period, and the hysteresis curve will also be balanced, so that there will not be a great magnetoelectric spring current. Power state 1. The action program features are as follows: When the mains power is off, enter the DC Mode processing program at the same time 2. First, capture the mains power off waveform angle position, and then calculate the detection action time compensation of the previous step 3, the rectifier opening angle The value update action 4 is to compensate the transformer to reach the balance, and then the mains synchronization signal acquisition 5 is performed to calculate the mains cycle 6 and voltage 7. Then the processor will determine the mains power failure point according to the above procedure and phase-lock calculation 8 Corresponding angle, enter PWM to enter DC Mode 9. According to the above processing procedure, the power-off cycle will be symmetrically balanced, as shown in Figure 2a and b. Figure 2a shows the connection at the corresponding angle when the mains power fails at 15 degrees; Figure 2b shows the connection at the corresponding angle _ degrees when the power failure occurs at 1 35 degrees. In addition, in the field of the exciting current, as shown in Figure 3a, the current waveform measured by the uninterruptible power system formed by the processing procedure of Figure 1 shows that the internal exciting current of the transformer will be significantly smaller (as indicated by point A (Shown), increase electricity

Page 7 561664 V. Description of the invention (5) Reliability of the crystal to avoid equipment damage. As shown in Figure 3b, in the conventional uninterruptible power equipment, the exciting current generated will obviously cause the breakdown of the electric crystal (as shown at point B), and then damage the system equipment. [Features and effects] The method for eliminating intermittent excitation current of the AC power supply of the present invention also has the following characteristics: 1. It has a more accurate voltage level. 2. It can achieve the advantages of fixed time connection and fixed period connection at the same time. In summary, the present invention has industrial applicability and advancement, and this case has not been seen in any publications, and it is also novel. It should meet the requirements of Article 19 and Article 20 of the Patent Law. However, the above is only one of the preferred embodiments of this creation. When the scope of implementation of the present invention cannot be limited by it, any equivalent changes, equivalent implementations or modifications made to the scope of patent application of the present invention shall still belong to Within the scope of the invention patent.

Page 8561664 Brief description of the diagram [Illustration] Figure 1 is a flowchart of the method for eliminating intermittent excitation current of the AC power supply according to the present invention; Figures 2a to b are waveform diagrams obtained by using this method; Figure 3 is to use The current waveforms obtained by this method are shown in Figure 4. Figure 4 is the waveforms obtained by using the fixed time connection method; Figure 5a ~ e are the waveforms obtained by using the fixed period connection method. [Mainly representative symbols] 1 Mains power failure 2 DC Mode processing 3 Retrieve power off angle position, detect action time compensation calculation 4 Rectifier opening angle value update action 5 Mains synchronization signal capture 6 Calculate mains cycle 7 Calculate mains voltage 8 Lock Phase calculation 9 DC Mode processing

Page 9

Claims (1)

) 61664 6. The scope of the patent application includes the following steps to eliminate the intermittent excitation current of the AC power supply: a. Detect the mains power-off signal; b. Obtain the mains power-off waveform angle. C. Divide the previous step. Measured d • Integral f device opening angle value update: make up for different w, e • count different mains cycles and voltages; f | & t: loop calculation and internal synchronization frequency adjustment; Hengxiong 2 way, Make the input / output voltage waveform before and after power-off be flat: 32-current power supply discontinuous excitation current elimination method, which is characterized by relative magnetism: make the control to make the interrupted and continuous voltage waveform reach a balanced state, then flow it to The hysteresis curve will also produce a balance without generating a large amount of magnetizing current output and input ports of the AC power supply as described in item 2 of the patented scope of magnetizing electricity. k 铒 mode controls each input Page 10