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Digital AC Controller

An AC controller and controller technology, applied in control/regulating systems, instruments, regulating electrical variables, etc., can solve the problems of unstable load operation, complex structure, low power factor, etc., to facilitate the adjustment of AC load work, circuit Simple structure and high reliability

Active Publication Date: 2017-02-15
厦门安普利生物工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the control of two-phase AC loads is mainly through frequency conversion control, phase-shift control, and PWM control. Among them, the inverter control effect is good, but the structure is complicated and the cost is high; The notched sine wave of the wave will have a notch "glitch" at the moment of commutation, which will cause distortion of the power supply voltage waveform and high-frequency electromagnetic wave radiation interference. When running with a large trigger delay angle, the power factor is low
;PWM control has poor control effect on inductive loads, poor waveform output, and unstable load operation

Method used

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Examples

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Embodiment 1

[0015] see figure 1 , a digital AC controller of the present invention comprises a zero-crossing detection circuit 1, a CPLD programmable logic controller 2, an MCU microprocessor 3, an AC drive circuit 4, a power supply circuit 5 and a load circuit 6, and a zero-crossing detection circuit 1 output is connected with the input of CPLD programmable logic device 2, MCU microprocessor 3 communication interface is connected with CPLD programmable logic device 2, the input of AC drive circuit 4 is connected with the output of CPLD programmable logic device 2, power supply circuit 5 and The load circuit 6 is connected to the AC drive circuit 4 through a power supply and load interface. According to the needs of actual control, the MCU microprocessor 3 converts the percentage output of the load circuit 6 into a digital signal, and sends it to the CPLD programmable logic controller 2 as the control target input data of the CPLD; The AC signal of the electricity is converted into a low...

Embodiment 2

[0017] Different from Example 1, in this example, see figure 2 , the digital AC controller also includes an interface circuit 7, the interface circuit 7 is connected between the AC drive circuit 4 and the load circuit 6, specifically, the output of the zero-crossing detection circuit 1 is connected with the input of the CPLD programmable logic device 2, and the MCU The communication interface of the microprocessor 3 is connected bidirectionally with the CPLD programmable logic device 2, and the output of the CPLD programmable logic device 2 is connected with the input of the AC drive circuit 4, and the input and output of the AC drive circuit 4 are connected to the input and output of the interface circuit 7, The output of the interface circuit 7 is connected to the input of the load circuit 6, the output of the load circuit 6 is connected to the input of the microprocessor 3, and the output of the power supply circuit 5 is connected to the input of the interface circuit 7 and...

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Abstract

The invention discloses a digital type alternating-current controller. The digital type alternating-current controller comprises a complex programmable logic device (CPLD), a zero-cross detection circuit, a microprogrammed control unit (MCU), an alternating-current drive circuit, a power supply circuit and a load circuit, wherein the input end of the zero-cross detection circuit is connected with an electric supply, the output end of the zero-cross detection circuit is connected with the input end of the CPLD, a two-way communicating junction is established between the CPLD and the MCU, the output end of the CPLD is connected with the input end of the alternating-current drive circuit, the output end of the alternating-current drive circuit is connected with the input end of the load circuit, the output end of the load circuit is connected with the input end of the MCU, and the power supply circuit supplies power for the alternating-current drive circuit. By means of the digital type alternating-current controller, the CPLD obtains a dead center position of a 220 V alternating current input through the zero-cross detection circuit. According to the percentage required by a load output by a main control part, starting time of a drive circuit after zero point is calculated by the CPLD, after reaching the time, a corresponding level is driven to an alternating current drive circuit, and the alternating current drive circuit drives the load to work.

Description

technical field [0001] The invention relates to an AC load control device, in particular to a controller for a two-phase AC inductive load or resistive load that requires digital adjustment. Background technique [0002] At present, the control of two-phase AC loads is mainly through frequency conversion control, phase-shift control, and PWM control. Among them, the inverter control effect is good, but the structure is complicated and the cost is high; The notched sine wave of the wave will have a notch "glitch" at the moment of commutation, causing power voltage waveform distortion and high-frequency electromagnetic wave radiation interference. When the trigger delay angle is large, the power factor is low. ; PWM control has poor control effect on inductive loads, poor waveform output, and unstable load operation. Contents of the invention [0003] Therefore, in view of the above-mentioned problems, the present invention provides a digital AC controller, by improving its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/44G05F1/66
Inventor 魏超游东岩冯丽欣魏劭
Owner 厦门安普利生物工程有限公司
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