CN110361671A - A kind of sampling module for UPS - Google Patents
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Abstract
本发明公开了一种用于UPS的采样模块，包括：电流采样电路和电压采样电路，所述电流采样电路和电压采样电路的输出端分别与DSP控制器的第一、第二A/D接口连接，所述电流采样电路包括：串接的闭环霍尔电流传感器、放大电路、偏置电路、第一电压跟随器，所述第一电压跟随器的输出端与所述第一A/D接口连接，所述电压采样电路包括：串接的霍尔电压传感器、反相放大器、第二电压跟随器、稳压电路，所述稳压电路的输出端与所述第二A/D接口连接。利用电流采样电路和电压采样电路，同时对市电的电流和电压进行采样，而且在利用DSP控制器进行采样前，利用放大电路和反相放大电路进行初步的线性放大计算，使得DSP控制器采样的更加精确。可用于UPS制造中。
The invention discloses a sampling module for UPS, comprising: a current sampling circuit and a voltage sampling circuit, the output ends of the current sampling circuit and the voltage sampling circuit are respectively connected to the first and second A/D interfaces of a DSP controller connected, the current sampling circuit includes: a closed-loop Hall current sensor connected in series, an amplifier circuit, a bias circuit, a first voltage follower, and the output terminal of the first voltage follower is connected to the first A/D interface connected, the voltage sampling circuit includes: a series-connected Hall voltage sensor, an inverting amplifier, a second voltage follower, and a voltage stabilizing circuit, and the output terminal of the voltage stabilizing circuit is connected to the second A/D interface. Use the current sampling circuit and the voltage sampling circuit to sample the current and voltage of the mains at the same time, and before using the DSP controller to sample, use the amplifier circuit and the inverting amplifier circuit to perform preliminary linear amplification calculations, so that the DSP controller samples more precise. Can be used in UPS manufacturing.
Description
技术领域technical field
本发明涉及开关电源技术领域，特别涉及一种用于UPS的采样模块。The invention relates to the technical field of switching power supplies, in particular to a sampling module for UPS.
背景技术Background technique
不间断电源(UPS)是一种外部非常重要的应急供电设备。在输入市电发生中断时，UPS可以持续一段时间供电给办公电脑等其他的设备，使我们能够有充分的时间去进行应对；同时在市电发生异常时，UPS还可以对市电进行有效的净化。同时，不间断电源作为一种电力电子装置，具有不用维护的储蓄能量设备和自动控制式的逆变电路，还具有模拟电路和数字电路。随着社会的发展，UPS在工厂、公司，甚至是家庭等各个领域得到了广泛的应用，UPS的重要性将会得到日益的提高。Uninterruptible power supply (UPS) is a very important external emergency power supply equipment. When the mains input is interrupted, the UPS can continue to supply power to other equipment such as office computers for a period of time, so that we can have sufficient time to deal with it; at the same time, when the mains is abnormal, the UPS can also effectively control the mains purify. At the same time, as a power electronic device, the uninterruptible power supply has a maintenance-free energy storage device and an automatically controlled inverter circuit, as well as an analog circuit and a digital circuit. With the development of society, UPS has been widely used in various fields such as factories, companies, and even households, and the importance of UPS will be increased day by day.
按互联网数据中心的统计数据，因为电源的问题造成电脑等设备的故障，这个比例约占百分之45左右。另外，电源还有电压瞬变过高、输入断电、电压纹波过大等各样问题。同时在中国，大城市、中等城市和小城市或者村镇平均断电的次数分别为0.5次每月、2次每月和4次每月。从上面可以看出，为了解决供电不稳定的问题，配置一台UPS给外部设备，这是非常重要的。另外，对于高端的通讯设备和高端的网络设备，这些都是不能允许有断电的情况发生的；特别是在网络中心，是以服务器为重要部分来运行的，这样UPS就显得更加重要了。不管是普通的电脑还是昂贵的电脑，在用过一段时间后，电脑中的文件数据就会显得非常有价值，所以为了预防文件数据的意外消失而配置一台不间断电源是非常有必要的。According to the statistics of the Internet data center, about 45% of the failures of computers and other equipment are caused by power supply problems. In addition, power supplies suffer from various problems such as excessive voltage transients, input brownouts, and excessive voltage ripple. At the same time in China, the average number of power outages in large cities, medium-sized cities and small cities or villages and towns is 0.5 times per month, 2 times per month and 4 times per month respectively. It can be seen from the above that in order to solve the problem of unstable power supply, it is very important to configure a UPS for external devices. In addition, for high-end communication equipment and high-end network equipment, these cannot be allowed to have a power outage; especially in the network center, the server is used as an important part of the operation, so UPS is even more important. Whether it is an ordinary computer or an expensive computer, the file data in the computer will become very valuable after a period of use, so it is very necessary to configure an uninterruptible power supply in order to prevent the accidental disappearance of file data.
现有的UPS大多采用DSP控制器作为控制芯片，来对其他功能模块进行控制，DSP控制器为TMS320F28335芯片，其中DSP控制器需要对电压或者电流进行采样，现有的采样方式大多采用DSP控制器内自带的AD采样来实现，该芯片自带的AD采样的采样精确度不高，从而影响到整个UPS的采样精度。Most of the existing UPS use DSP controller as the control chip to control other functional modules. The DSP controller is a TMS320F28335 chip. The DSP controller needs to sample the voltage or current. Most of the existing sampling methods use the DSP controller. The built-in AD sampling is realized, but the sampling accuracy of the chip’s own AD sampling is not high, which affects the sampling accuracy of the entire UPS.
发明内容Contents of the invention
本发明解决的技术问题是：现有的UPS的采样精确度不高。The technical problem solved by the invention is: the sampling accuracy of the existing UPS is not high.
本发明解决其技术问题的解决方案是：一种用于UPS的采样模块，包括：电流采样电路和电压采样电路，所述电流采样电路和电压采样电路的输出端分别与DSP控制器的第一、第二A/D接口连接，所述电流采样电路包括：串接的闭环霍尔电流传感器、放大电路、偏置电路、第一电压跟随器，所述第一电压跟随器的输出端与所述第一A/D接口连接，所述电压采样电路包括：串接的霍尔电压传感器、反相放大器、第二电压跟随器、稳压电路，所述稳压电路的输出端与所述第二A/D接口连接。The solution of the present invention to solve its technical problem is: a kind of sampling module that is used for UPS, comprises: current sampling circuit and voltage sampling circuit, the output terminal of described current sampling circuit and voltage sampling circuit is connected with the first of DSP controller respectively , the second A/D interface connection, the current sampling circuit includes: a closed-loop Hall current sensor connected in series, an amplifier circuit, a bias circuit, a first voltage follower, the output terminal of the first voltage follower is connected to the The first A/D interface is connected, and the voltage sampling circuit includes: a series-connected Hall voltage sensor, an inverting amplifier, a second voltage follower, and a voltage stabilizing circuit, and the output terminal of the voltage stabilizing circuit is connected to the first voltage stabilizing circuit. Two A/D interface connection.
进一步，所述放大电路包括：电阻R91、R92，电容C91，运算放大器U91，所述偏置电路包括：电阻R93，电容C92，所述第一电压跟随器包括：运算放大器U92，所述电阻R91的一端与运算放大器U91的同相输入端连接，所述电阻R91的另一端对地连接，所述运算放大器U91的反相输入端分别与闭环霍尔电流传感器的输出端，电阻R92的一端，电容C91的一端连接，所述运算放大器U91的输出端分别与电阻R92的另一端，电容C91的另一端，电容C92的一端，电阻R93的一端，运算放大器U92的同相输入端连接，所述电容C92的另一端对地连接，所述电阻R93的另一端连接+1.65V电源，所述运算放大器U92的反相输入端与其的输出端连接，运算放大器U92的输出端与所述第一A/D接口连接；Further, the amplifying circuit includes: resistors R91, R92, capacitor C91, operational amplifier U91, the bias circuit includes: resistor R93, capacitor C92, the first voltage follower includes: operational amplifier U92, the resistor R91 One end of the operational amplifier U91 is connected to the non-inverting input end of the operational amplifier U91, the other end of the resistor R91 is connected to the ground, the inverting input end of the operational amplifier U91 is respectively connected to the output end of the closed-loop Hall current sensor, one end of the resistor R92, and the capacitor One end of C91 is connected, and the output end of the operational amplifier U91 is respectively connected with the other end of the resistor R92, the other end of the capacitor C91, one end of the capacitor C92, one end of the resistor R93, and the non-inverting input of the operational amplifier U92. The capacitor C92 The other end of the resistor R93 is connected to the ground, the other end of the resistor R93 is connected to a +1.65V power supply, the inverting input terminal of the operational amplifier U92 is connected to its output terminal, and the output terminal of the operational amplifier U92 is connected to the first A/D interface connection;
所述反相放大器包括：电阻R94、R95、R96，运算放大器U93，所述第二电压跟随器包括：运算放大器U94，所述稳压电路包括：电容C93，稳压管D91，所述电阻R94的一端与霍尔电压传感器的输出端连接，所述电阻R94的另一端分别与电阻R95的一端，运算放大器U93的反相输入端连接，所述电阻R96的一端与运算放大器U93的同相输入端连接，所述电阻R96的另一端对地连接，所述运算放大器U93的输出端分别与电阻R95的另一端，运算放大器U94的同相输入端连接，所述运算放大器U94的反相输入端与其的输出端连接，所述运算放大器U94的输出端分别与电容C93的一端，稳压管D91的阴极，第二A/D接口连接，所述电容C93的另一端，稳压管D91的阳极分别对地连接。The inverting amplifier includes: resistors R94, R95, R96, an operational amplifier U93, the second voltage follower includes: an operational amplifier U94, and the voltage stabilizing circuit includes: a capacitor C93, a voltage stabilizing tube D91, and the resistor R94 One end of the resistor R94 is connected to the output terminal of the Hall voltage sensor, the other end of the resistor R94 is connected to one end of the resistor R95 and the inverting input terminal of the operational amplifier U93, and one end of the resistor R96 is connected to the non-inverting input terminal of the operational amplifier U93 connected, the other end of the resistor R96 is connected to the ground, the output terminal of the operational amplifier U93 is connected with the other end of the resistor R95 and the non-inverting input terminal of the operational amplifier U94, and the inverting input terminal of the operational amplifier U94 is connected with its The output terminal is connected, the output terminal of the operational amplifier U94 is respectively connected to one end of the capacitor C93, the cathode of the voltage regulator tube D91, and the second A/D interface, and the other end of the capacitor C93 is connected to the anode of the voltage regulator tube D91 respectively. ground connection.
进一步，所述闭环霍尔电流传感器的型号为LA-50P传感器。Further, the model of the closed-loop Hall current sensor is LA-50P sensor.
进一步，所述霍尔电压传感器型号为VSM500D。Further, the model of the Hall voltage sensor is VSM500D.
本发明的有益效果是：本发明创造利用电流采样电路和电压采样电路，同时对市电的电流和电压进行采样，而且在利用DSP控制器进行AD采样前，利用放大电路和反相放大电路进行初步的线性放大计算，使得采样的更加精确。The beneficial effects of the present invention are: the present invention utilizes the current sampling circuit and the voltage sampling circuit to simultaneously sample the current and voltage of the mains, and before utilizing the DSP controller to perform AD sampling, utilize the amplifying circuit and the inverting amplifying circuit to perform Preliminary linear amplification calculation makes sampling more accurate.
附图说明Description of drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单说明。显然，所描述的附图只是本发明的一部分实施例，而不是全部实施例，本领域的技术人员在不付出创造性劳动的前提下，还可以根据这些附图获得其他设计方案和附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in the description of the embodiments. Apparently, the described drawings are only some embodiments of the present invention, not all embodiments, and those skilled in the art can obtain other designs and drawings based on these drawings without creative work.
图1是本发明创造的采样模块的电路连接框图；Fig. 1 is the circuit connection block diagram of the sampling module that the present invention creates;
图2是采样模块的电路连接示意图。Fig. 2 is a schematic diagram of the circuit connection of the sampling module.
具体实施方式Detailed ways
以下将结合实施例和附图对本发明的构思、具体结构及产生的技术效果进行清楚、完整地描述，以充分地理解本发明的目的、特征和效果。显然，所描述的实施例只是本发明的一部分实施例，而不是全部实施例，基于本发明的实施例，本领域的技术人员在不付出创造性劳动的前提下所获得的其他实施例，均属于本发明保护的范围。另外，文中所提到的所有联接/连接关系，并非单指构件直接相接，而是指可根据具体实施情况，通过添加或减少联接辅件，来组成更优的联接结构。本发明创造中的各个技术特征，在不互相矛盾冲突的前提下可以交互组合。The idea, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The protection scope of the present invention. In addition, all the connection/connection relationships mentioned in this article do not refer to the direct connection of components, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interactively on the premise of not conflicting with each other.
实施例1，参考图1和图2，一种用于UPS的采样模块，包括：电流采样电路8a和电压采样电路8b，所述电流采样电路8a和电压采样电路8b的输出端分别与DSP控制器4的第一、第二A/D接口AD1、AD2连接，所述电流采样电路8a包括：串接的闭环霍尔电流传感器81、放大电路82、偏置电路83、第一电压跟随器84，所述第一电压跟随器84的输出端与所述第一A/D接口AD1连接，所述电压采样电路8b包括：串接的霍尔电压传感器85、反相放大器86、第二电压跟随器87、稳压电路88，所述稳压电路88的输出端与所述第二A/D接口AD2连接。Embodiment 1, with reference to Fig. 1 and Fig. 2, a kind of sampling module that is used for UPS, comprises: current sampling circuit 8a and voltage sampling circuit 8b, the output terminal of described current sampling circuit 8a and voltage sampling circuit 8b is controlled with DSP respectively The first and second A/D interfaces AD1 and AD2 of the device 4 are connected, and the current sampling circuit 8a includes: a closed-loop Hall current sensor 81 connected in series, an amplifier circuit 82, a bias circuit 83, and a first voltage follower 84 , the output end of the first voltage follower 84 is connected to the first A/D interface AD1, and the voltage sampling circuit 8b includes: a series-connected Hall voltage sensor 85, an inverting amplifier 86, a second voltage follower 87 and a voltage stabilizing circuit 88, the output end of the voltage stabilizing circuit 88 is connected to the second A/D interface AD2.
所述放大电路82包括：电阻R91、R92，电容C91，运算放大器U91，所述偏置电路83包括：电阻R93，电容C92，所述第一电压跟随器84包括：运算放大器U92，所述电阻R91的一端与运算放大器U91的同相输入端连接，所述电阻R91的另一端对地连接，所述运算放大器U91的反相输入端分别与闭环霍尔电流传感器81的输出端，电阻R92的一端，电容C91的一端连接，所述运算放大器U91的输出端分别与电阻R92的另一端，电容C91的另一端，电容C92的一端，电阻R93的一端，运算放大器U92的同相输入端连接，所述电容C92的另一端对地连接，所述电阻R93的另一端连接+1.65V电源，所述运算放大器U92的反相输入端与其的输出端连接，运算放大器U92的输出端与所述第一A/D接口AD1连接；The amplifying circuit 82 includes: resistors R91, R92, a capacitor C91, and an operational amplifier U91. The bias circuit 83 includes: a resistor R93 and a capacitor C92. The first voltage follower 84 includes: an operational amplifier U92, and the resistor One end of R91 is connected to the non-inverting input end of the operational amplifier U91, the other end of the resistor R91 is connected to the ground, the inverting input end of the operational amplifier U91 is respectively connected to the output end of the closed-loop Hall current sensor 81, and one end of the resistor R92 , one end of the capacitor C91 is connected, the output end of the operational amplifier U91 is respectively connected with the other end of the resistor R92, the other end of the capacitor C91, one end of the capacitor C92, one end of the resistor R93, and the non-inverting input of the operational amplifier U92. The other end of the capacitor C92 is connected to the ground, the other end of the resistor R93 is connected to a +1.65V power supply, the inverting input terminal of the operational amplifier U92 is connected to its output terminal, and the output terminal of the operational amplifier U92 is connected to the first A /D interface AD1 connection;
所述反相放大器86包括：电阻R94、R95、R96，运算放大器U93，所述第二电压跟随器87包括：运算放大器U94，所述稳压电路88包括：电容C93，稳压管D91，所述电阻R94的一端与霍尔电压传感器85的输出端连接，所述电阻R94的另一端分别与电阻R95的一端，运算放大器U93的反相输入端连接，所述电阻R96的一端与运算放大器U93的同相输入端连接，所述电阻R96的另一端对地连接，所述运算放大器U93的输出端分别与电阻R95的另一端，运算放大器U94的同相输入端连接，所述运算放大器U94的反相输入端与其的输出端连接，所述运算放大器U94的输出端分别与电容C93的一端，稳压管D91的阴极，第二A/D接口AD2连接，所述电容C93的另一端，稳压管D91的阳极分别对地连接。The inverting amplifier 86 includes: resistors R94, R95, R96, and an operational amplifier U93, the second voltage follower 87 includes: an operational amplifier U94, and the voltage stabilizing circuit 88 includes: a capacitor C93, a voltage stabilizing tube D91, and One end of the resistor R94 is connected to the output terminal of the Hall voltage sensor 85, the other end of the resistor R94 is connected to one end of the resistor R95 and the inverting input terminal of the operational amplifier U93, and one end of the resistor R96 is connected to the operational amplifier U93 The non-inverting input terminal of the operational amplifier U94 is connected to the non-inverting input terminal of the operational amplifier U94, and the other end of the operational amplifier U93 is connected to the ground. The input terminal is connected to its output terminal, the output terminal of the operational amplifier U94 is respectively connected with one end of the capacitor C93, the cathode of the voltage regulator tube D91, and the second A/D interface AD2, and the other end of the capacitor C93 is connected with the voltage regulator tube The anodes of D91 are connected to the ground respectively.
当本发明创造的电路工作时，所述闭环霍尔电流传感器81和霍尔电压传感器85的输入端分别连接市电。When the circuit created by the present invention works, the input terminals of the closed-loop Hall current sensor 81 and the Hall voltage sensor 85 are respectively connected to the mains.
闭环霍尔电流传感器81将市电的电流信号转换成电压信号，作为优化，所述闭环霍尔电流传感器81采用莱姆公司研发的LA-50P传感器，其可以达到50A的电流有效值，最大有±80A的电流值。闭环霍尔电流传感器81输出的信号输入到放大电路82中，所述放大电路82为由电阻R91、R92，电容C91，运算放大器U91组成的反相比例放大电路82，该电路将信号进行线性放大计算，因为DSP控制器4的第一A/D接口AD1不能够采样负电压值，所以在进行线性放大计算后，再添加一个+1.65V直流偏置电路83，使得负电压值变成正，最后通过第一电压跟随器84的输出端送到第一A/D接口AD1中，实现电流的采集。The closed-loop Hall current sensor 81 converts the current signal of the mains power into a voltage signal. As an optimization, the closed-loop Hall current sensor 81 adopts the LA-50P sensor developed by Lime Company, which can reach a current effective value of 50A, and the maximum ±80A current value. The signal output by the closed-loop Hall current sensor 81 is input into the amplifying circuit 82. The amplifying circuit 82 is an inverse proportional amplifying circuit 82 composed of resistors R91, R92, a capacitor C91, and an operational amplifier U91. This circuit amplifies the signal linearly Calculate, because the first A/D interface AD1 of DSP controller 4 cannot sample negative voltage values, so after performing linear amplification calculations, add a +1.65V DC bias circuit 83 again, so that negative voltage values become positive, Finally, the output terminal of the first voltage follower 84 is sent to the first A/D interface AD1 to realize current collection.
市电的电压经过霍尔电压传感器85，所述霍尔电压传感器85把市电的电压信号转变成电流信号，作为优化，所述霍尔电压传感器85为江苏茶花传感器公司研发的VSM500D，额定检测电压是500V，测量范围0～±750V，霍尔电压传感器85输出的电流通过反相放大器86，其中经过电阻R94产生电压信号，该电压信号通过运算放大器U93进行线性放大计算，再通过第二电压跟随器87输入到DSP控制器4的第二A/D接口AD2中，从而实现电压采样，为了使得信号更加稳定，在第二电压跟随器87的输出端连接稳压电路88。The voltage of the mains passes through the Hall voltage sensor 85, and the Hall voltage sensor 85 converts the voltage signal of the mains into a current signal. As an optimization, the Hall voltage sensor 85 is VSM500D developed by Jiangsu Camellia Sensor Company, and the rated detection The voltage is 500V, and the measurement range is 0 to ±750V. The current output by the Hall voltage sensor 85 passes through the inverting amplifier 86, and a voltage signal is generated through the resistor R94. The voltage signal is linearly amplified and calculated by the operational amplifier U93, and then passed through the second voltage The follower 87 is input to the second A/D interface AD2 of the DSP controller 4 to realize voltage sampling. In order to make the signal more stable, the output terminal of the second voltage follower 87 is connected to a voltage stabilizing circuit 88 .
本发明创造利用电流采样电路8a和电压采样电路8b，同时对市电的电流和电压进行采样，而且在利用DSP控制器4进行采样前，利用放大电路82和反相放大电路82进行初步的线性放大计算，使得DSP控制器4采样的更加精确。通过测试，增加本采样模块后的采样精度比单纯使用DSP控制器4的采样精度增加了20％。The present invention uses the current sampling circuit 8a and the voltage sampling circuit 8b to simultaneously sample the current and voltage of the mains, and before using the DSP controller 4 to sample, use the amplification circuit 82 and the inverting amplification circuit 82 to perform preliminary linear The amplified calculation makes the sampling by the DSP controller 4 more accurate. Through testing, the sampling accuracy after adding this sampling module is increased by 20% compared with the sampling accuracy of simply using the DSP controller 4 .
以上对本发明的较佳实施方式进行了具体说明，但本发明创造并不限于所述实施例，熟悉本领域的技术人员在不违背本发明精神的前提下还可做出种种的等同变型或替换，这些等同的变型或替换均包含在本申请权利要求所限定的范围内。The preferred embodiments of the present invention have been described in detail above, but the invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent modifications or replacements without violating the spirit of the present invention. , these equivalent modifications or replacements are all included within the scope defined by the claims of the present application.
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