TW297962B - DC/AC converting method and device thereof - Google Patents

Abstract

A DC/AC converting method comprises of the steps: (1) detecting feedback current; (2) compared the detected feedback current with instruction, in which the instruction is reference signal; (3) locking the comparison result with fixed frequency, deciding output, making output current flow to direction with decreased error; (4) when comparison result changes, reversing the output.

Description

A7 B7 V. Description of the invention (3) The present invention relates to a direct / AC conversion method and device. Specifically, it is a direct / AC conversion method and device that uses a current mode to control the crystal switch to switch and supply power. The conventionally used direct / AC power conversion has a single-phase or three-phase composition method, but whether it is single-phase or three-phase, each phase has two openings. As shown in Figure 1, it is a switching circuit of one of the three phases (or a single phase), where the Qup and Qun open state are complementary. When QiiP is turned on and Qun is turned off, the voltage at point U is positive (P); otherwise, when Qun is turned on and Qup is turned off, the voltage at point ϕ is negative (N). The two open states cannot be opened at the same time to avoid short circuit between PNs. If you switch quickly through Qup and Qun, and control the residence time of the above two states, then the average voltage of ϋ can be read continuously to control the voltage between P and N. This method is called Wavelength Modulation (PWM). There are many kinds of control methods in the traditional wave width modulation straightening / AC power conversion, which mainly include: open loop control and closed channel control. Open-loop control mainly includes: Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling in this page) (1) Compare the sine wave reference signal with the triangular wave. When the former is higher than the latter, Qup Control is on and Qun control is off. Conversely, when the former is lower than the latter, Qup control is Kan and Qun control is On. (2) Same as the first method, but the comparison calculation is off-line pre-calculation, and the calculation result is stored in the memory. During operation, the controller reads the data in the memory and sends out the bandwidth modulation switch signal. (3) Same as the second method, but the offline pre-calculation process does not use the sine wave reference signal to compare with the triangle wave, but uses the optimized calculation. This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) 207Q62 A7 B7. The Ministry of Economic Affairs Central Standards Bureau employee consumption cooperation du printing 5. The description of the invention (4) The switching time of the wine road control is planned in advance, so When the load fluctuates, its output also changes. In order to make the output more stable, it is necessary to rotate the feedback detection to perform the controller trimming action, which is called closed loop control. Therefore, the switching time of the closed loop is determined during operation. The controller's online feedback signal processing and control calculation methods determine the controller's response speed, reliability and stability. There are many types of closed-loop control methods, but they can be divided into the following three methods: (1) Hysteresis control is to compare the output feedback signal with the reference signal. When the feedback signal is larger than the reference signal, Q up is Kan Qun is on; conversely, when the feedback signal is smaller than the reference signal, Q up is on and Q un is Kan. (2) Ratio control, as shown in Figure 2, uses the output voltage feedback signal 1 and reference signal 2 to calculate the error signal. The error signal becomes the control signal 4 through the compensator 3, and the control signal 4 is compared with the triangular wave signal 5 6 to control the Qup or Qun switch control signal in Figure 1. (3) Advanced controls such as fuzzy, neural-like control, toughness, predictive control, etc. (academic research). Among the closed-loop control methods, hysteresis control is the simplest method, but the switching frequency cannot be determined. Note that there will be a phenomenon that the switching is too fast, which leads to overheating or secondary breakdown of the semiconductor. But it also has the advantage of natural current limiting function. Ratio control is currently the most commonly used closed-loop control method. Its switching frequency is determined by the frequency of the triangular wave, and its opening time is determined by the control signal, and the control signal is based on the error signal. The general circuit uses the control signal as the ratio integral differential of the error signal (PID,

Proportional, Integra】, Differential), so the Chinese national standard (CNS) A4 specification (210X297 public daughter) is applicable at the straight / paper scale (please read the precautions on the back before filling this page)

A7 B7 5's statement Ϊ Ming forwards the current, and sends the five-capacity electricity to the letter of inductance. As As of f —- ~ in comparison with the system, the figure is more than 20k. The wave power is the same as the system, and the control equipment is added and exported. Because of the vibration, the output voltage of the third device compensates for the signal angle 3 of the meridian and the 4th signal. The 7th output of the control and control station is 1-ΛΨ. Figure 3 The Q control makes the signal 6. 3 Fast cutting speed

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Control and Control Ν U Control Transformer 8¾ Broad Wave Μ Piezoelectric leveling point refurbishment: 〇 is the control end of the pressure type-the control of the two streams is connected to the direct current of the capacitor, ο- 电 3 之-When the time is between 7 and the filter is stopped, the adjustment is to adjust the state of the first wheel and then press the two most on the above, but it is controlled. Electricity ------.-- · Installation-- (Please read the precautions on the back before filling out this page)

C. The sense of electricity is that it continues because of a sudden change.

L Order the Ministry of Economic Affairs Central Standards Bureau employee consumer cooperatives to print the output point to the control piezoelectricity, point ο U 9 from the difference due to the phase division product each time the product needs two points ο difference phase division product two times system There is a shortcoming in controlling and giving back here. The shortcoming is that it has its own device to change the flow.-The knowledge of the Zhizhi / Dazhiji is used to learn this. Learn about this service. In the case of the direct mode of the direct current of the direct current, the device that is missing from the outgoing point is transferred to the current transfer fct? ^ Gt * / (ν, the fixed change of the fixed M is the delivery of lumens / the custom fixed control does not flow It's the highest frequency that can be hidden

The NUQ and the control of direct connection of UPS and electricity are related to this. The standard of this paper is the Chinese National Standard (CNS) A4 specification (210X297 mm). Printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. Control A7 B7 5. Description of invention (6) Control inductor current, after one-time integration (phase difference 90 °), it is possible to modify the round output voltage, and it is not easy to produce vibration through control. The purpose of the present invention is to provide a direct / AC conversion method and device capable of keeping the switching frequency of the switch fixed; another object of the present invention is to provide a direct / AC conversion method and device with a natural current limiting function; Yet another object is to provide a direct / AC conversion method and device that is difficult to generate oscillation in feedback control. The current mode DC / AC conversion method of the present invention includes the steps of: (a) detecting the feedback current; (b) comparing the detected feedback current with an instruction, where the instruction can be a reference signal or M can be a voltage feedback The error between the reference signal and the reference signal, the current command signal after error compensation; (c) The result of the comparison is locked with a fixed frequency to determine the output, so that the output current is in the direction of reducing the error; (d) When the result of the comparison changes , The output is inverted. The current mode direct / AC conversion device of the present invention comprises: an input mechanism, which inputs a reference signal; a voltage feedback mechanism, which obtains the feedback electrical® signal from the device's wheel output; and a compensation mechanism, which uses the feedback electrical surge Compensate the error between the signal and the reference signal to output the current command; the current feedback mechanism to obtain the feedback current signal of the device output current; the triangle wave generation mechanism to generate the triangle wave signal and perform slope compensation on the obtained feedback current signal; this paper The standard is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) (Please read the precautions on the back before filling this page)

、 1T 2DV962 A7 B7 Fifth, the description of invention (7) Comparator, the current command output from the compensation mechanism and the in-phase structured machine produced by the slope compensation signal pulse; the wave angle is three compared to the number and the letter, The flow structure is used to grant the reimbursement of the return control, and the output of the control output is prepared, the number is determined, and the pulse is il Fl · IIUU. The device setting is lower than the control and receiving M. The number of input and output is lower than the lower side. The installation difference will be β Μϋ 0 shells. The detector and the comparison are more relevant than the letter. It makes the combination of the line phase and the number of the word and the detailed description of the reference. The following diagram consists of the points. As described above, it is more obvious to change the parts of this type of diagram attached to the second phase of the table. The two parts should be switched to the alternating current / straight phase 1 of which the third phase or the single phase is the Tutuji road. The power switch is good at AM crystal's first device to switch the flow / direct system For example, the roadmap for road closures is based on the Tutuchi road electrical control system. The B system is shown in Figure 3. The control system is changed to a flow control / straight control system. Xi Wei (please read the precautions on the back and then fill out this page) Printed and distributed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs; straight; control; control roads-electric model Feelings§ 明明 电 发 有 # Equipment two output 4 output first flow / straight control circuit closed-type mold flow electrical diagram. The flow of Li in the process 5-Mingzhi example_This oil is real, law chart " Details of the 5th conversion chart; the legend of the 5th example of the actual electric diagram of the Shi Road is the S chart. The 6th switch of the 6th conversion chart. Please refer to the figure. The structure of the machine is changed to control the flow in the case of I / direct implementation Γ model I flow power generation δ of 3 is shown in Figure 71. The size of the first copy of the paper is applicable to the Chinese National Standard (CNS) Α4 specification (210Χ297 mm) 7 Staff Consumption Cooperation of the Central Bureau of Standards of the Ministry of Economic Affairs Printed by the company A7 B7 5. Description of the invention (8) Refer to Figure 4. First, in step S1, the feedback current is detected; in step S2, the detected feedback current is compared with the instruction, which can be used as a reference The signal can also be the error between the obtained voltage feedback signal and the reference signal, and the current command signal after error compensation; in step S3, the result of the comparison is locked with a fixed frequency to determine the output of the device to reduce the current to the error. Direction; in step S4, when the result of the comparison changes, the output of the device is inverted. For the embodiment of the current horizontal / direct current / AC conversion device of the present invention, please refer to FIG. 5 first. In the figure, the current feedback signal 8 is slope compensated by the triangle wave signal 14 output by the triangle wave generator 5 (the triangle wave signal may not be used for slope compensation, so that the feedback current signal will have the effect of subharmonic oscillation (SUBHARMONIC OSCULATION)) Then, the compensated signal a is compared with the current command 10 or the obtained signal b of the reference signal 2 in the comparator 6. The current command 10 or the reference signal 2 selected can be determined by selecting the open signal S1. Among them, the current command 10 is the error signal 9 after the voltage feedback signal 1 and the reference signal 2 are subtracted, and is obtained by the compensator 3 after performing the proportional integral differentiation. The result of the comparison of the comparator 6 is that the high signal or the low signal passes through the controller 1 to determine the state of the switches Qup and Qun. For example, when the current command signal 10 is greater than the detected current feedback signal 8, Qup is turned on by default. Qun is preset to Kan, making the output positive, and the preset time is generated by a fixed frequency timer. When the comparison value (high / low) is reversed, it is controlled by the monostable circuits 12a, 12b in the controller 11 in conjunction with the setting (SET) and clearing (CLR) inputs of the D-type flip-flops 13a, 13b, Qup and Qun are switched to invert the output power. In this way, the purpose of continuous adjustment and control of the average electrical charge at U point (or 0 point) is achieved, and because this paper scale is applicable to the Chinese National Standard (CNS) Α4 specification (2 丨 0 X 297 mm) 8 (Please read first (Notes on the back then fill out this page) -installed ·

, 1T A7 B7 V. Description of the invention (9) The current feedback signal 8 taken from the inductor is used for closed-loop control, so the switching action directly controls the inductor current, and the output can be trimmed by one-time integration (phase difference 90 °) Voltage, control is not easy to oscillate; it also has the function of natural current limit when Qup and Qun switch to reverse the output power. In the embodiment of FIG. 5, the truth table of the outputs Q〇 and ΕΓΓ of the controller 11 is shown in Table 1. M controls the states of the switches Q up and Qun. When there is a pulse signal input, if the current command signal 10 is greater than the detected feedback current 8, the input at 15 is a positive (1) potential and Qup is preset to be on and Qun is preset to be off, making 0 The output is positive; on the contrary, when the current command signal 10 is 8 hours longer than the detected feedback current, the input at 15 is non-positive (0) potential and Q up is preset to be off Qun is preset to be on, so that 0 points The output is negative. When there is no pulse signal (CLK) input, if the input signal at 15 falls from the positive signal edge, the output of Q〇 and Γ5 " will be inverted immediately so that the output of Qo becomes low and the output is high, so that Qup is off and CUin is on; on the contrary, if the wave edge of the input signal of 15 rises from a low potential to a high potential, the output of Q and Qup is turned on and Qun is turned off again. (Please read the precautions on the back before filling in this page)-installed., ^ Τ The paper standard printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs applies the Chinese National Standard (CNS) Α4 specification (210Χ297 mm) 9 A7 B7 5 、 Description of invention (10) Table 1) Clock input and output Q〇 output cnr 1 1 0 J1 0 0 1 0 1 ί 1 0 -------- / Install-(please read the precautions on the back first (Fill in this page) Figure 6 is a detailed circuit diagram of the actual example of Figure 5 printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs, where box 16 is a punch. FIG. 7 is a timing diagram of signals of the control mechanism 11 according to an embodiment of the present invention. In the figure, 8 is the current signal of the inductor in the filter 7, that is, the current feedback signal; 14 is the triangular wave (ramp) signal; a is the composite signal of the current signal 8 and the triangular wave signal 14, and b is the current command; a Comparison with b produces signal 15, which represents the ON / OFF time of Qup / Qun; the timing difference between 13a and 13b in the control mechanism 11; error] No. 5 zero-crossing signal is recorded at the time; the small fixed variable In the wrong NUQ Μ or a current number telecommunications, the normal state of production will give the head to overhaul the galvanic electricity to avoid% change to NUQ and PUQ to make love. Do n’t focus on understanding and understanding, and the gods should singularly distribute the texts, but they should be broad. Although the various types of the attached book are published, the paper size in this case is applicable to the Chinese National Standard (CNS) Μ specification (210X 297 gong)

Claims (1)

Printed by ABCD Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. 6. Patent application scope 1. A current mode DC / AC conversion method, including steps: U) detecting the feedback current; (b) comparing the detected feedback current with the instruction , Where the instruction is a reference signal; (c) lock the result of the comparison with a fixed frequency, determine the output, and make the direction of the output current note error decrease; (d) when the result of the comparison changes, invert the output. 2. For example, the current horizontal-direction AC / AC conversion method of the first patent application, where the command is the error of the voltage feedback signal and the reference signal, and the current command signal after error compensation. 3. A current mode direct / AC conversion device, including: a turn-in mechanism to input a reference signal; a current feedback mechanism to obtain a feedback current signal from the device's wheel current; a comparator to compare the input reference signal with the feedback The current signal is compared; the control mechanism receives the output signal of the comparator and outputs the control signal M to control the switching action of the two switches of the device to determine the turn of the device so that the error between the reference signal and the detected output current goes to the error The direction of decrease is performed; when the output signal of the comparator changes, the output of the device is inverted. 4. If the current mode direct / AC conversion device of the third item of the patent scope is applied, it also includes: Voltage feedback configuration, the feedback voltage letter of the output voltage of the device is obtained. The paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297 Mm) ^ ..................... installed ............... ordered ... ......... line (please read the precautions on the back and then fill out this page) A8 B8 C8 D8 Patent application range number; the signal test reference of the number and the reference number. 'The flow back to the power means that the flow should be selected and the power will be selected and the output will be lost. It is better to make up the difference in the compensation than the machine to compensate for the difference in the compensation. Special request and application 1 such as 5 items 4 installation and conversion of alternating current / straight mold current including the right to obtain the general signal of the wave angle three production mechanism machine student 1JE1 Yunbo angle three letter test reference or The order refers to the current; the elective alternative compares the rater to compare the signal, and the current is passed through the letter to give back the control to the receiving system; -When the control compares the number, the letter is compared to the signal, the letter The signal flow is the same as that of the signal and electricity phase. Sometimes the combined machine is compensated and the production rate is increased. The wave rate is oblique and the output is reduced after three losses. If it is wrong, the difference will be changed when the error is installed. If the error starts, the flow signal will be changed and the output will be cut out. The device will be tested and compared with the second one and be believed; Examination system participation control to the K, the opposite of the number of outgoing equipment (please read the notes on the back before filling out this page). Installation. \ S0 Printed copy of the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs The paper scale uses the Chinese National Standards (CNS) A4 specification (210X297 public daughter)