CN117439607B - Universal analog quantity acquisition circuit - Google Patents
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Abstract
本发明属于电力电子技术领域，具体涉及一种通用化模拟量采集电路。包括：通用化配置电路、两个调理电路，通用化配置电路包括四个电阻，R1第二端接地，R2两端分别连接模拟量输入信号、R3第二端，R3第一端接2.5V电源，R4第二端接地；第一调理电路由运放M1A组成，M1A输入端正端与R2、R3的公共端连接，输入负端与M1A输出端连接，供电正端连接5V电源；第二调理电路包括五个电阻、运放M1B，R5两端分别与M1A输出端以及R6第一端和M1B输入端负端连接，R6第二端与M1B输出端和R9第一端连接，R7两端分别与2.5V电源以及R8第一端和M1B输入正端连接。
The present invention belongs to the field of power electronics technology, and specifically relates to a universal analog quantity acquisition circuit. The invention comprises: a universal configuration circuit and two conditioning circuits, wherein the universal configuration circuit comprises four resistors, the second end of R1 is grounded, the two ends of R2 are respectively connected to the analog quantity input signal and the second end of R3, the first end of R3 is connected to a 2.5V power supply, and the second end of R4 is grounded; the first conditioning circuit is composed of an operational amplifier M1A, the positive end of the input end of M1A is connected to the common end of R2 and R3, the negative end of the input end is connected to the output end of M1A, and the positive end of the power supply is connected to a 5V power supply; the second conditioning circuit comprises five resistors and an operational amplifier M1B, the two ends of R5 are respectively connected to the output end of M1A and the first end of R6 and the negative end of the input end of M1B, the second end of R6 is connected to the output end of M1B and the first end of R9, and the two ends of R7 are respectively connected to the 2.5V power supply and the first end of R8 and the positive end of the input of M1B.
Description
技术领域Technical Field
本发明属于电力电子技术领域，具体涉及一种通用化模拟量采集电路。The invention belongs to the technical field of power electronics, and in particular relates to a universal analog quantity acquisition circuit.
背景技术Background technique
模拟量采集是电子设备常见的基本功能，由于处理能力原因通常将待采集的模拟量信号通过采集电路，转换为一定幅值的模拟量信号。传统的模拟量采集电路分为直流电压采集电路、直流电流采集电路、交流电压采集电流和交流电流采集电路，各电路间不能通用，不具备适配性和通用性，当外部需求变更后，往往需要重新设计电路，增加了时间、人力成本。Analog quantity acquisition is a common basic function of electronic devices. Due to processing power reasons, the analog signal to be acquired is usually converted into an analog signal of a certain amplitude through an acquisition circuit. Traditional analog quantity acquisition circuits are divided into DC voltage acquisition circuits, DC current acquisition circuits, AC voltage acquisition current acquisition circuits, and AC current acquisition circuits. The circuits are not universal and lack adaptability and versatility. When external requirements change, the circuits often need to be redesigned, which increases time and labor costs.
同时，当采集电路损坏后，传统的采集电路不具备快速定位的功能，不便于故障产品的故障定位、排故和功能修复。At the same time, when the acquisition circuit is damaged, the traditional acquisition circuit does not have the function of rapid positioning, which is not convenient for fault location, troubleshooting and functional repair of the faulty product.
发明内容Summary of the invention
发明目的：提供一种通用化模拟量采集电路，实现采集交、直流电压和电流的功能。Purpose of the invention: To provide a universal analog quantity acquisition circuit to realize the function of acquiring AC and DC voltage and current.
技术方案：Technical solutions:
一种通用化模拟量采集电路，包括：通用化配置电路、第一调理电路、第二调理电路，其中，A universal analog quantity acquisition circuit includes: a universal configuration circuit, a first conditioning circuit, and a second conditioning circuit, wherein:
通用化配置电路由电阻R1、R2、R3、R4组成，R2第一端连接模拟量输入信号，R1第二端接地，R2第二端与R3第二端连接，R3第一端接2.5V电源，R4第二端接地；The universal configuration circuit is composed of resistors R1, R2, R3, and R4, the first end of R2 is connected to the analog input signal, the second end of R1 is grounded, the second end of R2 is connected to the second end of R3, the first end of R3 is connected to a 2.5V power supply, and the second end of R4 is grounded;
第一调理电路由运放M1A组成，M1A输入端正端与R2、R3的公共端连接，M1A输入负端与M1A输出端连接，M1A供电端正端连接5V电源，M1A供电端负端接地；The first conditioning circuit is composed of an operational amplifier M1A, the positive end of the M1A input terminal is connected to the common end of R2 and R3, the negative end of the M1A input terminal is connected to the M1A output terminal, the positive end of the M1A power supply terminal is connected to a 5V power supply, and the negative end of the M1A power supply terminal is grounded;
第二调理电路由电阻R5、R6、R7、R8、R9和运放M1B组成，R5第一端与M1A输出端连接，R5第二端与R6第一端和M1B输入端负端连接，R6第二端与M1B输出端和R9第一端连接，R7第一端与2.5V电源连接，R7第二端与R8第一端和M1B输入端正端连接，R8第二端接地，R9第二端为输出端，M1B供电端正端连接5V电源，M1B供电端负端接地。The second conditioning circuit is composed of resistors R5, R6, R7, R8, R9 and operational amplifier M1B. The first end of R5 is connected to the output end of M1A, the second end of R5 is connected to the first end of R6 and the negative end of the input end of M1B, the second end of R6 is connected to the output end of M1B and the first end of R9, the first end of R7 is connected to a 2.5V power supply, the second end of R7 is connected to the first end of R8 and the positive end of the input end of M1B, the second end of R8 is grounded, the second end of R9 is the output end, the positive end of the M1B power supply is connected to a 5V power supply, and the negative end of the M1B power supply is grounded.
进一步地，当电路用于采集直流电压时，通用化配置电路中不连接电阻R1，仅连接电阻R2、R3、R4实现采集功能，R4第一端与R2第二端以及R3第二端连接。Furthermore, when the circuit is used to collect DC voltage, the resistor R1 is not connected in the universal configuration circuit, and only the resistors R2, R3, and R4 are connected to realize the collection function, and the first end of R4 is connected to the second end of R2 and the second end of R3.
进一步地，当电路用于采集直流电流时，通用化配置电路中不连接电阻R4，仅连接电阻R1、R2、R3实现采集功能，R1第一端与R2第一端连接。Furthermore, when the circuit is used to collect direct current, the resistor R4 is not connected in the universal configuration circuit, and only the resistors R1, R2, and R3 are connected to realize the collection function, and the first end of R1 is connected to the first end of R2.
进一步地，当电路用于采集交流电压时，通用化配置电路中不连接电阻R1，仅连接电阻R2、R3、R4实现采集功能，R4第一端与R2第二端以及R3第二端连接。Furthermore, when the circuit is used to collect AC voltage, the resistor R1 is not connected in the universal configuration circuit, and only the resistors R2, R3, and R4 are connected to realize the collection function, and the first end of R4 is connected to the second end of R2 and the second end of R3.
进一步地，当电路用于采集交流电流时，通用化配置电路中不连接电阻R4，仅连接电阻R1、R2、R3实现采集功能，R1第一端与R2第一端连接。Furthermore, when the circuit is used to collect alternating current, the resistor R4 is not connected in the universal configuration circuit, and only the resistors R1, R2, and R3 are connected to realize the collection function, and the first end of R1 is connected to the first end of R2.
进一步地，输出电压的计算公式为：Furthermore, the calculation formula of the output voltage is:
，其中，ANALOG_IN为输入。 , where ANALOG_IN is the input.
进一步地，输出电压的计算公式为：Furthermore, the calculation formula of the output voltage is:
，其中，ANALOG_IN为输入。 , where ANALOG_IN is the input.
进一步地，输出电压的计算公式为：Furthermore, the calculation formula of the output voltage is:
，其中，ANALOG_IN为输入。 , where ANALOG_IN is the input.
进一步地，输出电压的计算公式为：Furthermore, the calculation formula of the output voltage is:
，其中，ANALOG_IN为输入。 , where ANALOG_IN is the input.
有益效果：Beneficial effects:
利用本发明可通过调整通用化配置电路中R1、R2、R3、R4的规格，配置采集电路用于采集交、直流电压和电流。通过第一调理电路，实现电压跟随功能，后续电路降低对模拟量信号的影响。通过第二调理电路，实现减法功能，保证输出电压与输入模拟量呈负相关关系，从而实现断线检测的功能。The present invention can be used to configure the acquisition circuit for collecting AC and DC voltages and currents by adjusting the specifications of R1, R2, R3, and R4 in the universal configuration circuit. The voltage following function is realized through the first conditioning circuit, and the subsequent circuit reduces the impact on the analog signal. The subtraction function is realized through the second conditioning circuit to ensure that the output voltage is negatively correlated with the input analog quantity, thereby realizing the function of disconnection detection.
可适用于交、直流电压和电流采集的应用场景，其中通用化配置区不仅可用于调整电路所采集的模拟量种类，还可以通过调整四个电阻的阻值，从而匹配模拟量的范围。实现了采集交、直流电压和电流的功能。同时增加了断线检测功能，在拓宽电路适用范围的前提下，还有利于电路故障后的快速定位、排故和功能修复。It can be applied to the application scenarios of AC and DC voltage and current collection. The universal configuration area can not only be used to adjust the type of analog quantity collected by the circuit, but also to match the range of analog quantity by adjusting the resistance values of four resistors. The function of collecting AC and DC voltage and current is realized. At the same time, the disconnection detection function is added. On the premise of broadening the scope of application of the circuit, it is also conducive to the rapid positioning, troubleshooting and functional repair of circuit faults.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为通用化模拟量采集电路。Figure 1 is a universal analog quantity acquisition circuit.
具体实施方式Detailed ways
本发明设计通用化模拟量采集电路，可拓宽电路的适用范围，同时增加断线检测的功能，对于电路后续维护，具有较大的实用价值。The present invention designs a universal analog quantity acquisition circuit, which can broaden the application scope of the circuit and simultaneously increase the function of disconnection detection, which has great practical value for subsequent maintenance of the circuit.
下面结合附图和具体实施例对本发明进行描述。The present invention is described below in conjunction with the accompanying drawings and specific embodiments.
如图1所示的一种通用化模拟量采集电路，所述电路包括通用化配置电路、第一调理电路、第二调理电路。通用化配置电路，由电阻R1、R2、R3、R4组成，R1第一端与R2第一端连接，并连接模拟量输入信号，R1第二端接地，R2第二端与R3第二端和R4第一端连接，R3第一端接2.5V电源，R4第二端接地。第一调理电路，由运放M1A组成，M1A输入端正端与R2、R3、R4的公共端连接，M1A输入负端与M1A输出端连接，M1A供电端正端连接5V电源，M1A供电端负端接地。第二调理电路，由电阻R5、R6、R7、R8、R9和运放M1B组成，R5第一端与M1A输出端连接，R5第二端与R6第一端和M1B输入端负端连接，R6第二端与M1B输出端和R9第一端连接，R7第一端与2.5V电源连接，R7第二端与R8第一端和M1B输入端正端连接，R8第二端接地，R9第二端为输出端，M1B供电端正端连接5V电源，M1B供电端负端接地。A universal analog quantity acquisition circuit as shown in FIG1 includes a universal configuration circuit, a first conditioning circuit, and a second conditioning circuit. The universal configuration circuit is composed of resistors R1, R2, R3, and R4. The first end of R1 is connected to the first end of R2 and is connected to the analog quantity input signal. The second end of R1 is grounded. The second end of R2 is connected to the second end of R3 and the first end of R4. The first end of R3 is connected to a 2.5V power supply, and the second end of R4 is grounded. The first conditioning circuit is composed of an operational amplifier M1A. The positive end of the M1A input terminal is connected to the common end of R2, R3, and R4. The negative end of the M1A input terminal is connected to the M1A output terminal. The positive end of the M1A power supply terminal is connected to a 5V power supply, and the negative end of the M1A power supply terminal is grounded. The second conditioning circuit is composed of resistors R5, R6, R7, R8, R9 and operational amplifier M1B, the first end of R5 is connected to the output end of M1A, the second end of R5 is connected to the first end of R6 and the negative end of the input end of M1B, the second end of R6 is connected to the output end of M1B and the first end of R9, the first end of R7 is connected to a 2.5V power supply, the second end of R7 is connected to the first end of R8 and the positive end of the input end of M1B, the second end of R8 is grounded, the second end of R9 is the output end, the positive end of the M1B power supply end is connected to a 5V power supply, and the negative end of the M1B power supply end is grounded.
通用化配置电阻有R1、R2、R3、R4四个。当电路用于采集直流电压时，不连接电阻R1，仅连接电阻R2、R3、R4，即可实现采集功能。The four universal configuration resistors are R1, R2, R3, and R4. When the circuit is used to collect DC voltage, the collection function can be realized by not connecting resistor R1 and only connecting resistors R2, R3, and R4.
通用化配置电阻有R1、R2、R3、R4四个。当电路用于采集直流电流时，不连接电阻R4，仅连接电阻R1、R2、R3，即可实现采集功能。There are four universal configuration resistors: R1, R2, R3, and R4. When the circuit is used to collect DC current, the collection function can be realized by connecting only resistors R1, R2, and R3 without connecting resistor R4.
通用化配置电阻有R1、R2、R3、R4四个。当电路用于采集交流电压时，不连接电阻R1，仅连接电阻R2、R3、R4，即可实现采集功能。The four universal configuration resistors are R1, R2, R3, and R4. When the circuit is used to collect AC voltage, the collection function can be realized by not connecting resistor R1 and only connecting resistors R2, R3, and R4.
通用化配置电阻有R1、R2、R3、R4四个。当电路用于采集交流电流时，不连接电阻R4，仅连接电阻R1、R2、R3，即可实现采集功能。The four universal configuration resistors are R1, R2, R3, and R4. When the circuit is used to collect AC current, the collection function can be realized by connecting only resistors R1, R2, and R3 without connecting resistor R4.
输入模拟量信号通过R4接2.5V电源，对输入模拟量进行补偿。The input analog signal is connected to a 2.5V power supply through R4 to compensate the input analog quantity.
输入模拟量信号与输出模拟量信号呈负相关关系。根据输入模拟量信号与输出模拟量信号的负相关关系，判断调理电路是否存在断线现象。The input analog signal is negatively correlated with the output analog signal. Based on the negative correlation between the input analog signal and the output analog signal, it is determined whether the conditioning circuit has a disconnection phenomenon.
1）直流电压采集过程：1) DC voltage acquisition process:
直流电压输出电压的计算公式为：The DC voltage output voltage is calculated as:
，其中，ANALOG_IN为输入。 , where ANALOG_IN is the input.
当外部输入28V直流电压时，即公式中ANALOG_IN为28，依次核实R2、R3、R4、R5、R6、R7和R8的数值，并带入公式，即可计算得到输出电压。输出电压为直流电压信号。When the external input voltage is 28V DC, that is, ANALOG_IN in the formula is 28, the values of R2, R3, R4, R5, R6, R7 and R8 are checked in turn, and the output voltage can be calculated by substituting them into the formula. The output voltage is a DC voltage signal.
2）直流电流采集过程：2) DC current acquisition process:
直流电流输出电压的计算公式为：The DC current output voltage is calculated as:
当外部输入100mA直流电流时，即公式中ANALOG_IN为0.1，依次核实R1、R2、R3、R5、R6、R7和R8的数值，并带入公式，即可计算得到输出电压。输出电压为直流电压信号。When the external input is 100mA DC current, that is, ANALOG_IN in the formula is 0.1, the values of R1, R2, R3, R5, R6, R7 and R8 are checked in turn, and the output voltage can be calculated by substituting them into the formula. The output voltage is a DC voltage signal.
3）交流电压采集过程：3) AC voltage acquisition process:
交流电压输出电压的计算公式为：The calculation formula for the AC voltage output voltage is:
当外部输入有效值115V的交流正弦波时，即公式中ANALOG_IN为115，依次核实R2、R3、R4、R5、R6、R7和R8的数值，并带入公式，即可计算得到输出电压。输出电压为交流电压信号。When an AC sine wave with an effective value of 115V is input externally, that is, ANALOG_IN in the formula is 115, the values of R2, R3, R4, R5, R6, R7 and R8 are checked in turn, and the output voltage can be calculated by substituting them into the formula. The output voltage is an AC voltage signal.
4）交流电流采集过程：4) AC current collection process:
交流电流输出电压的计算公式为：The calculation formula for AC current output voltage is:
当外部输入有效值100mA的交流正弦波时，即公式中ANALOG_IN为0.1，依次核实R1、R2、R3、R5、R6、R7和R8的数值，并带入公式，即可计算得到输出电压。输出电压为交流电压信号。When the external input is an AC sine wave with an effective value of 100mA, that is, ANALOG_IN in the formula is 0.1, the values of R1, R2, R3, R5, R6, R7 and R8 are checked in turn, and the output voltage can be calculated by substituting them into the formula. The output voltage is an AC voltage signal.
原理说明：Principle description:
当输出电压与输入信号之间呈正相关关系，甚至正比例关系时，若外部信号输入为0，输出电压也应该为0V；在特定场景下，若检测到输出电压为0V，无法识别此现象是由于输入信号为0导致的，还是采集电路损坏导致的。设计保证输出电压与输入信号之间呈负相关关系，可避免上述问题，还可以实现电路的自检，当输出电压为4V时，可认为输入信号为0；当输出电压为0V时，可认为采集电路损坏。When the output voltage is positively correlated with the input signal, or even proportionally correlated, if the external signal input is 0, the output voltage should also be 0V; in certain scenarios, if the output voltage is detected to be 0V, it is impossible to identify whether this phenomenon is caused by the input signal being 0 or the acquisition circuit being damaged. The design ensures that the output voltage is negatively correlated with the input signal to avoid the above problems and also enables self-checking of the circuit. When the output voltage is 4V, the input signal can be considered to be 0; when the output voltage is 0V, the acquisition circuit can be considered to be damaged.
输出电压和输入信号之间呈负相关关系，通过设置R5~R8电阻，可实现当无外部信号输入时，输出电压为4V左右，随着外部信号增大，输出电压随输入信号线性减小。再通过设置R1~R4的电阻，保证输入信号额定范围的最大值时，输出电压不小于1V。上述设计可保证输出电压的额定值为1~4V，以保证输出电压进入后端A/D转换电路时，避免使用边界区域，以提高A/D转换的精度。There is a negative correlation between the output voltage and the input signal. By setting the R5~R8 resistors, the output voltage can be around 4V when there is no external signal input. As the external signal increases, the output voltage decreases linearly with the input signal. By setting the R1~R4 resistors, the output voltage is not less than 1V when the input signal reaches the maximum value of the rated range. The above design can ensure that the rated value of the output voltage is 1~4V, so as to avoid using the boundary area when the output voltage enters the back-end A/D conversion circuit, so as to improve the accuracy of A/D conversion.
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| CN104764920A (en) * | 2014-01-03 | 2015-07-08 | 国家电网公司 | MMC flexible direct-current power transmission dynamic simulation experiment platform analog acquisition system and realizing method |
| JP2018093574A (en) * | 2016-11-30 | 2018-06-14 | ローム株式会社 | AC current detection circuit |
| CN108768380A (en) * | 2018-08-24 | 2018-11-06 | 唐智科技湖南发展有限公司 | A kind of modulate circuit of sensor |
| CN213023325U (en) * | 2020-09-04 | 2021-04-20 | 东土科技(宜昌)有限公司 | Analog quantity voltage acquisition circuit |
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| US7564249B2 (en) * | 2003-12-21 | 2009-07-21 | Tk Holdings, Inc. | Signal processing system and method |
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| CN104764920A (en) * | 2014-01-03 | 2015-07-08 | 国家电网公司 | MMC flexible direct-current power transmission dynamic simulation experiment platform analog acquisition system and realizing method |
| JP2018093574A (en) * | 2016-11-30 | 2018-06-14 | ローム株式会社 | AC current detection circuit |
| CN108768380A (en) * | 2018-08-24 | 2018-11-06 | 唐智科技湖南发展有限公司 | A kind of modulate circuit of sensor |
| CN213023325U (en) * | 2020-09-04 | 2021-04-20 | 东土科技(宜昌)有限公司 | Analog quantity voltage acquisition circuit |
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