WO2018171188A1 - 双向可控硅交流电流通断的判断方法 - Google Patents

双向可控硅交流电流通断的判断方法 Download PDF

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Publication number
WO2018171188A1
WO2018171188A1 PCT/CN2017/107516 CN2017107516W WO2018171188A1 WO 2018171188 A1 WO2018171188 A1 WO 2018171188A1 CN 2017107516 W CN2017107516 W CN 2017107516W WO 2018171188 A1 WO2018171188 A1 WO 2018171188A1
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signal
pin
current
alternating current
bidirectional control
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PCT/CN2017/107516
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English (en)
French (fr)
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朱曙东
杨长平
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深圳市复兴伟业技术有限公司
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Publication of WO2018171188A1 publication Critical patent/WO2018171188A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
    • G01R19/2509—Details concerning sampling, digitizing or waveform capturing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

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  • the invention relates to the field of electronic devices, in particular to a method for judging the bidirectional thyristor alternating current on and off.
  • resistors are used as current sensors.
  • the AC voltage on the resistors is rectified and amplified to serve as a decision signal.
  • the voltage signal on the resistor is rectified and amplified and sent to the CPU for determination.
  • the resistor is prone to heat, affecting the service life of the product, and also requires a rectifying and amplifying circuit, the circuit structure is relatively complicated, the use cost is high, and the judgment accuracy is low.
  • the technical problem to be solved by the invention is to provide a method for judging the bidirectional thyristor AC current on and off by a simple circuit structure, a simple judgment method and high judgment precision.
  • a method for judging the bidirectional thyristor AC current on and off comprising the following steps: S1: when the AC current of the triac is turned on, the CPU 1 to 3 of the triac The foot is sampled by the AD signal to obtain a signal map of 1 to 3 feet, and the threshold is set according to the signal diagram; S2: when used, the signal value of the AD signal sampling of the triac 3 pin continues for a preset time, wherein, the preset time If it is greater than half an AC clock cycle, it is judged whether the sampled signal value has a signal value greater than a set threshold, and if there is a current, if no current flows; S3: Step S2 is repeatedly executed until the end of use.
  • the set threshold is 50% of the maximum value of the 1-pin to 3-pin signal.
  • step S2 the AD signal sampling triac 3 pin signal value continues for a preset time of more than 13 milliseconds.
  • the invention sets the threshold value, and uses the 1-pin to 3-pin signal diagram to make the sampling time of the AD signal be greater than half an AC clock cycle, and can determine whether the sampled signal value has a signal greater than the set threshold. If the value of the signal exceeds the set threshold value, if there is a current value, if there is a signal value that does not exceed the set threshold value, no current will pass; and the repeated AD signal is passed. Sampling and judgment The break can be used to judge the bidirectional thyristor AC current on and off in real time, the circuit structure is simple, the judgment method is simple, and the judgment accuracy is high.
  • FIG. 1 is a circuit diagram of the invention
  • Fig. 2 is a signal diagram of the triac 1 to 3 pins of the invention when a current is passed through.
  • the embodiment provides a method for judging the bidirectional thyristor AC current on and off.
  • the judging method includes the following steps: First, step S1: when the bidirectional thyristor AC current is turned on, the bidirectional thyristor is passed through the CPU.
  • the 1st to 3rd feet are sampled by the AD signal, and the signal diagram of the 1st to 3rd feet is obtained as shown in Fig. 2.
  • the curve 201 is the alternating current curve through the triac
  • the curve 202 is the 1st to 3rd of the bidirectional thyristor.
  • the signal value of the AD signal is sampled, and then the threshold of the signal value is set according to the 1-pin to 3-pin signal diagram. Generally, the threshold of the signal value is set to 50% of the maximum value of the 1-pin to 3-pin signal.
  • step S2 is performed, that is, in actual use, as shown in FIG. 2, the signal value of the 3-pin of the triac thyristor MOC3083 is continued by the CPU for AD for a preset time, wherein, preset The time is greater than half an AC clock cycle.
  • the AC clock cycle of 50 Hz is 20 milliseconds, and the duration of AD is greater than 10 milliseconds; the AC clock cycle of 60 Hz is 18.7 milliseconds, and the duration of AD is greater than 9.4 milliseconds.
  • the time for sampling the continuous AD signal can be set to be greater than 13 milliseconds.
  • step S2 is repeatedly executed until the end of use, and the sampling and sampling of the AD signal are repeatedly performed in a timely manner, so that the triac can be judged in real time to ensure that the load has current passing through, and is found in time.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)
  • Electronic Switches (AREA)

Abstract

一种双向可控硅交流电流通断的判断方法，包括如下步骤：S1：在接通双向可控硅的交流电流时，通过CPU对双向可控硅的1脚至3脚进行AD信号采样，得到1脚至3脚信号图，根据信号图设定阀值；S2：使用时，AD采样双向可控硅3脚信号值持续一预设时间，其中，预设时间为大于半个交流时钟周期，判断采样的信号值是否有出现大于设定阀值的信号值，有则为有电流通过，无则无电流通过；S3：反复执行步骤S2，直至使用结束。该方法可以通过判断采样的信号值是否有出现大于设定阀值的信号值，并通过反复不断的AD采样和判断，可以对双向可控硅交流电流通断进行实时判断，电路结构简单，判断方法简单，判断精度高。

Description

双向可控硅交流电流通断的判断方法 技术领域
本发明涉及电子设备领域，尤其涉及的是一种双向可控硅交流电流通断的判断方法。
背景技术
常规用电阻作为电流传感器，电阻上的交流电压经过整流和放大后作为判定信号，对于可控硅的应用(闭环控制)上也需要判定在给了触发信号后可控硅是否正真有电流通过，这通常需要在电路里串联电阻作为电流传感器，电阻上的电压信号经过整流和放大处理后送给CPU判定。
如此，通过串联电阻，电阻容易发热，影响产品使用寿命，并且，还需要整流和放大电路，电路结构比较复杂，使用成本较高，判断精度低。
因此，现有技术存在缺陷，需要改进。
发明内容
本发明所要解决的技术问题是：提供一种电路结构简单，判断方法简单，判断精度高的双向可控硅交流电流通断的判断方法。
本发明的技术方案如下：一种双向可控硅交流电流通断的判断方法，包括如下步骤：S1：在接通双向可控硅的交流电流时，通过CPU对双向可控硅的1脚至3脚进行AD信号采样，得到1脚至3脚信号图，根据信号图设定阀值；S2：使用时，AD信号采样双向可控硅3脚信号值持续一预设时间，其中，预设时间为大于半个交流时钟周期，判断采样的信号值是否有出现大于设定阀值的信号值，有则为有电流通过，无则无电流通过；S3：反复执行步骤S2，直至使用结束。
应用于上述技术方案，所述的判断方法中，步骤S1中：设定的阀值为1脚至3脚信号最大值的50％。
应用于上述技术方案，所述的判断方法中，步S2中，AD信号采样双向可控硅3脚信号值持续一预设时间为大于13毫秒。
采用上述方案，本发明通过设定阀值，利用1脚至3脚信号图，使AD信号采样时间大于半个交流时钟周期，可以通过判断采样的信号值是否有出现大于设定阀值的信号值，如判断为有超过设定的阀值的信号值出现，则为有电流通过，如判断为没有超过设定的阀值的信号值出现，则无电流通过；并通过反复不断的AD信号采样和判 断，可以对双向可控硅交流电流通断进行实时判断，电路结构简单，判断方法简单，判断精度高。
附图说明
图1为发明的电路结构图；
图2为发明中有电流通过时双向可控硅1脚至3脚的信号图。
具体实施方式
以下结合附图和具体实施例，对本发明进行详细说明。
本实施例提供了一种双向可控硅交流电流通断的判断方法，该判断方法包括如下步骤：首先，步骤S1：在接通双向可控硅的交流电流时，通过CPU对双向可控硅的1脚至3脚进行AD信号采样，得到1脚至3脚信号图如图2所示，曲线201为通过双向可控硅的交流电流曲线，曲线202为双向可控硅的1脚至3脚进行AD信号采样的信号值，然后根据1脚至3脚信号图来设定信号值的阀值，一般地，将信号值的阀值设置为1脚至3脚信号最大值的50％。
在设定好阀值后，执行步骤S2，即在实际使用时，如图2所示，通过CPU的AD采样双向可控硅MOC3083的3脚的信号值持续一预设时间，其中，预设时间为大于半个交流时钟周期，例如，50HZ的交流时钟周期是20毫秒，则AD采用持续的时间为大于10毫秒；60HZ的交流时钟周期是18.7毫秒，则AD采用持续的时间为大于9.4毫秒；优选地，可以将持续AD信号采样的时间设置为大于13毫秒，如此，可以通过判断采样的信号值是否有出现大于设定阀值的信号值，如判断为有超过设定的阀值的信号值出现，则为有电流通过，如判断为没有超过设定的阀值的信号值出现，则无电流通过。
并且，最后S3，即反复执行步骤S2，直至使用结束，及时使AD信号采样反复不停的执行采用和判断，如此，可以实时对双向可控硅进行判断，确保负载有电流通过，并且及时发现问题和解决。
以上仅为本发明的较佳实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (3)

  1. 一种双向可控硅交流电流通断的判断方法，其特征在于，包括如下步骤：
    S1：在接通双向可控硅的交流电流时，通过CPU对双向可控硅的1脚至3脚进行AD信号采样，得到1脚至3脚信号图，根据信号图设定阀值；
    S2：使用时，AD信号采样双向可控硅3脚信号值持续一预设时间，其中，预设时间为大于半个交流时钟周期，判断采样的信号值是否有出现大于设定阀值的信号值，有则为有电流通过，无则无电流通过；
    S3：反复执行步骤S2，直至使用结束。
  2. 根据权利要求1所述的判断方法，其特征在于，步骤S1中：设定阀值为1脚至3脚信号最大值的50％。
  3. 根据权利要求1所述的判断方法，其特征在于，步S2中，AD信号采样双向可控硅3脚信号值持续一预设时间为持续大于13毫秒。
PCT/CN2017/107516 2017-03-21 2017-10-24 双向可控硅交流电流通断的判断方法 WO2018171188A1 (zh)

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