CN207301151U - A kind of capacitive divider - Google Patents
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Abstract
本申请公开了一种电容分压器，包括分压电路、电压跟随器、信号放大电路和滤波电路；所述分压电路包括供电电源、第一电容和第二电容；所述电压跟随器的同相输入端与所述第一电容和第二电容之间的部分相连接；所述电压跟随器的反向输入端与所述电压跟随器的输出端连接；所述信号放大电路包括第一放大器、第一电阻、第二电阻、第三电阻和第一滑动电阻；所述滤波电路包括第四电阻、第五电阻、第三电容、第四电容、第二放大器和第二滑动电阻。本申请具有结构简单、造价低廉、性价比高的优点，由于结构简单不会出现颠簸损坏，并且易于运输。
The application discloses a capacitor voltage divider, including a voltage divider circuit, a voltage follower, a signal amplification circuit and a filter circuit; the voltage divider circuit includes a power supply, a first capacitor and a second capacitor; the voltage follower's The non-inverting input terminal is connected to the part between the first capacitor and the second capacitor; the inverting input terminal of the voltage follower is connected to the output terminal of the voltage follower; the signal amplifying circuit includes a first amplifier , a first resistor, a second resistor, a third resistor and a first sliding resistor; the filter circuit includes a fourth resistor, a fifth resistor, a third capacitor, a fourth capacitor, a second amplifier and a second sliding resistor. The application has the advantages of simple structure, low cost and high performance-price ratio, because of the simple structure, it will not be damaged by bumps, and it is easy to transport.
Description
技术领域technical field
本申请涉及电力设备检测领域，尤其涉及一种电容分压器。The present application relates to the field of electric equipment detection, in particular to a capacitive voltage divider.
背景技术Background technique
用于高压脉冲测量的分压器主要有电阻式及电容式两种结构。电阻分压器由于分压臂的电阻元件存在寄生参数，其测量频带受到加大限制，待测脉冲前沿速度较快时，响应特性不能满足测量要求，同时电阻分压器有限的输入阻抗对待测系统电路存在一定的影响。The voltage divider used for high-voltage pulse measurement mainly has two structures: resistive and capacitive. Due to the parasitic parameters of the resistance element of the voltage divider arm, the measurement frequency band of the resistance voltage divider is greatly restricted. When the front speed of the pulse to be measured is fast, the response characteristics cannot meet the measurement requirements. At the same time, the limited input impedance of the resistance voltage divider to be measured There is a certain influence on the system circuit.
目前，对于前沿速度较快的脉冲，一般采用电容分压器的测量方式。但是电容式分压器结构复杂、容易颠簸损坏，不易运输。成本相对电阻式分压器偏高。At present, for pulses with a faster leading edge, the measurement method of a capacitor voltage divider is generally used. However, the capacitive voltage divider has a complex structure, is easily damaged by bumps, and is not easy to transport. The cost is relatively high compared to the resistive voltage divider.
实用新型内容Utility model content
为了解决上述问题，本申请提供了一种电容分压器，包括分压电路、电压跟随器、信号放大电路和滤波电路；In order to solve the above problems, the present application provides a capacitor voltage divider, including a voltage divider circuit, a voltage follower, a signal amplification circuit and a filter circuit;
所述分压电路包括供电电源、第一电容和第二电容；The voltage dividing circuit includes a power supply, a first capacitor and a second capacitor;
所述供电电源、第一电容和第二电容依次串接；The power supply, the first capacitor and the second capacitor are sequentially connected in series;
所述电压跟随器的同相输入端与所述第一电容和第二电容之间的部分相连接；The non-inverting input terminal of the voltage follower is connected to the part between the first capacitor and the second capacitor;
所述电压跟随器的反向输入端与所述电压跟随器的输出端连接；The reverse input terminal of the voltage follower is connected to the output terminal of the voltage follower;
所述信号放大电路包括第一放大器、第一电阻、第二电阻、第三电阻和第一滑动电阻；The signal amplifying circuit includes a first amplifier, a first resistor, a second resistor, a third resistor and a first sliding resistor;
所述电压跟随器的输出端与所述第一电阻的一端连接；The output end of the voltage follower is connected to one end of the first resistor;
所述第一电阻的另一端与所述第一放大器的同相输入端连接；The other end of the first resistor is connected to the non-inverting input end of the first amplifier;
所述第一放大器的反相输入端通过所述第二电阻接地；The inverting input terminal of the first amplifier is grounded through the second resistor;
所述第一放大器的反向输入端还通过第三电阻与所述第一放大器的输出端连接；The inverting input terminal of the first amplifier is also connected to the output terminal of the first amplifier through a third resistor;
所述第一放大器的电源端与工作电源连接；The power supply end of the first amplifier is connected to the working power supply;
所述第一放大器的电源端还通过第一滑动电阻与工作电源连接；The power supply terminal of the first amplifier is also connected to the working power supply through the first sliding resistor;
所述滤波电路包括第四电阻、第五电阻、第三电容、第四电容、第二放大器和第二滑动电阻；The filter circuit includes a fourth resistor, a fifth resistor, a third capacitor, a fourth capacitor, a second amplifier and a second sliding resistor;
所述第一放大器的输出端通过第四电阻和第五电阻与所述第二放大器的同相输入端连接；The output terminal of the first amplifier is connected to the non-inverting input terminal of the second amplifier through the fourth resistor and the fifth resistor;
所述第三电容的一端与所述第四电阻与第五电阻之间的部分连接；One end of the third capacitor is connected to a portion between the fourth resistor and the fifth resistor;
所述第三电容的另一端与所述第二放大器的输出端连接；The other end of the third capacitor is connected to the output end of the second amplifier;
所述第二放大器的同相输入端还通过第四电容接地；The non-inverting input terminal of the second amplifier is also grounded through the fourth capacitor;
所述第二放大器的电源端与工作电源VCC连接；The power supply terminal of the second amplifier is connected to the working power supply VCC;
所述第二放大器的电源端还通过第二滑动电阻与工作电源连接。The power supply terminal of the second amplifier is also connected to the working power supply through the second sliding resistor.
进一步地，所述电容分压器还包括示波器，所述示波器的输入端与所述第二电容并联连接；Further, the capacitive voltage divider also includes an oscilloscope, the input terminal of the oscilloscope is connected in parallel with the second capacitor;
所述示波器的输入端还与所述第二放大器的输出端连接。The input terminal of the oscilloscope is also connected to the output terminal of the second amplifier.
进一步地，所述电容分压器包括频率特性测试仪，所述频率特性测试仪与所述示波器连接；Further, the capacitive voltage divider includes a frequency characteristic tester, and the frequency characteristic tester is connected to the oscilloscope;
所述频率特性测试仪还与所述第二电阻并联。The frequency characteristic tester is also connected in parallel with the second resistor.
由以上技术方案可知，本申请提供一种电容分压器，具有结构简单、造价低廉、性价比高的优点，由于结构简单不会出现颠簸损坏，并且易于运输。It can be seen from the above technical solutions that the present application provides a capacitive voltage divider, which has the advantages of simple structure, low cost, and high cost performance. Due to the simple structure, it will not be damaged by bumps and is easy to transport.
附图说明Description of drawings
为了更清楚地说明本申请的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，对于本领域普通技术人员而言，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to illustrate the technical solution of the present application more clearly, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, on the premise of not paying creative work, Additional drawings can also be derived from these drawings.
图1为本申请提供的一种电容分压器的电路图。FIG. 1 is a circuit diagram of a capacitive voltage divider provided by the present application.
具体实施方式Detailed ways
参见图1，本申请提供了一种电容分压器，包括分压电路、电压跟随器、信号放大电路和滤波电路；Referring to Fig. 1, the present application provides a capacitor voltage divider, including a voltage divider circuit, a voltage follower, a signal amplification circuit and a filter circuit;
所述分压电路包括供电电源V1、第一电容C1和第二电容C2；The voltage dividing circuit includes a power supply V1, a first capacitor C1 and a second capacitor C2;
所述供电电源V1、第一电容C1和第二电容C2依次串接；The power supply V1, the first capacitor C1 and the second capacitor C2 are sequentially connected in series;
所述电压跟随器U1的同相输入端与所述第一电容C1和第二电容C2之间的部分相连接；The non-inverting input terminal of the voltage follower U1 is connected to the part between the first capacitor C1 and the second capacitor C2;
所述电压跟随器U1的反向输入端与所述电压跟随器U1的输出端连接；The reverse input terminal of the voltage follower U1 is connected to the output terminal of the voltage follower U1;
所述信号放大电路包括第一放大器U2、第一电阻R1、第二电阻R2、第三电阻R3和第一滑动电阻R6；The signal amplifying circuit includes a first amplifier U2, a first resistor R1, a second resistor R2, a third resistor R3 and a first sliding resistor R6;
所述电压跟随器U1的输出端与所述第一电阻R1的一端连接；The output end of the voltage follower U1 is connected to one end of the first resistor R1;
所述第一电阻R1的另一端与所述第一放大器U2的同相输入端连接；The other end of the first resistor R1 is connected to the non-inverting input end of the first amplifier U2;
所述第一放大器U2的反相输入端通过所述第二电阻R2接地；The inverting input terminal of the first amplifier U2 is grounded through the second resistor R2;
所述第一放大器U2的反向输入端还通过第三电阻R3与所述第一放大器U2的输出端连接；The inverting input terminal of the first amplifier U2 is also connected to the output terminal of the first amplifier U2 through a third resistor R3;
所述第一放大器U2的电源端与工作电源VCC连接；The power supply end of the first amplifier U2 is connected to the working power supply VCC;
所述第一放大器U2的电源端还通过第一滑动电阻R6与工作电源VCC连接；The power supply terminal of the first amplifier U2 is also connected to the working power supply VCC through the first sliding resistor R6;
所述滤波电路包括第四电阻R4、第五电阻R5、第三电容C3、第四电容C4、第二放大器U2和第二滑动电阻R7；The filter circuit includes a fourth resistor R4, a fifth resistor R5, a third capacitor C3, a fourth capacitor C4, a second amplifier U2 and a second sliding resistor R7;
所述第一放大器U2的输出端通过第四电阻R4和第五电阻R5与所述第二放大器U3的同相输入端连接；The output terminal of the first amplifier U2 is connected to the non-inverting input terminal of the second amplifier U3 through the fourth resistor R4 and the fifth resistor R5;
所述第三电容C3的一端与所述第四电阻R4与第五电阻R5之间的部分连接；One end of the third capacitor C3 is connected to a part between the fourth resistor R4 and the fifth resistor R5;
所述第三电容C3的另一端与所述第二放大器U3的输出端连接；The other end of the third capacitor C3 is connected to the output end of the second amplifier U3;
所述第二放大器U3的同相输入端还通过第四电容C4接地；The non-inverting input terminal of the second amplifier U3 is also grounded through the fourth capacitor C4;
所述第二放大器U3的电源端与工作电源VCC连接；The power supply terminal of the second amplifier U3 is connected to the working power supply VCC;
所述第二放大器U3的电源端还通过第二滑动电阻R7与工作电源VCC连接。The power supply terminal of the second amplifier U3 is also connected to the working power supply VCC through the second sliding resistor R7.
本实施例的工作原理为：供电电压V1为110kV交流工频电压，采用1pF和100nF的第一电容C1和第二电容C2串联构成电容分压电路，由其分压特性可得，分压器输出的电压峰-峰值为3.11V，有效值为1.1V。电压跟随器U1在电路中起到信号隔离和提高输入阻抗的作用。之后，电压经放大电路将信号进行放大到合适的幅度，再对信号进行滤波处理。The working principle of this embodiment is: the power supply voltage V1 is 110kV AC power frequency voltage, and the first capacitor C1 and the second capacitor C2 of 1pF and 100nF are connected in series to form a capacitor voltage divider circuit. It can be obtained that the peak-to-peak voltage output by the voltage divider is 3.11V, and the effective value is 1.1V. The voltage follower U1 plays the role of signal isolation and improving input impedance in the circuit. Afterwards, the voltage is amplified to a suitable amplitude by the amplifying circuit, and then the signal is filtered.
由以上技术方案可知，本申请提供一种电容分压器，具有结构简单、造价低廉、性价比高的优点，由于结构简单不会出现颠簸损坏，并且易于运输。It can be seen from the above technical solutions that the present application provides a capacitive voltage divider, which has the advantages of simple structure, low cost, and high cost performance. Due to the simple structure, it will not be damaged by bumps and is easy to transport.
进一步地，所述电容分压器还包括示波器，所述示波器的输入端与所述第二电容C2并联连接；Further, the capacitive voltage divider also includes an oscilloscope, the input terminal of the oscilloscope is connected in parallel with the second capacitor C2;
所述示波器的输入端还与所述第二放大器U3的输出端连接。The input end of the oscilloscope is also connected to the output end of the second amplifier U3.
进一步地，所述电容分压器包括频率特性测试仪，所述频率特性测试仪与所述示波器连接；Further, the capacitive voltage divider includes a frequency characteristic tester, and the frequency characteristic tester is connected to the oscilloscope;
所述频率特性测试仪还与所述第二电阻R2并联。The frequency characteristic tester is also connected in parallel with the second resistor R2.
上述实施例通过示波器和频率特性测试仪对电容分压器的输出波形和频率特性进行监测，可方便工作人员对电容分压器的工作状态进行监测。In the above embodiment, the output waveform and frequency characteristics of the capacitive voltage divider are monitored by an oscilloscope and a frequency characteristic tester, which can facilitate staff to monitor the working state of the capacitive voltage divider.
由以上技术方案可知，本申请提供一种电容分压器，具有结构简单、造价低廉、性价比高的优点，由于结构简单不会出现颠簸损坏，并且易于运输。It can be seen from the above technical solutions that the present application provides a capacitive voltage divider, which has the advantages of simple structure, low cost, and high cost performance. Due to the simple structure, it will not be damaged by bumps and is easy to transport.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112611906A (en) * | 2020-12-31 | 2021-04-06 | 大连民族大学 | Portable handheld oscilloscope |
| CN113890148A (en) * | 2021-09-30 | 2022-01-04 | 中天宽带技术有限公司 | Battery short-circuit protection circuit and battery charging and discharging circuit |
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2017
- 2017-10-25 CN CN201721387937.4U patent/CN207301151U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112611906A (en) * | 2020-12-31 | 2021-04-06 | 大连民族大学 | Portable handheld oscilloscope |
| CN113890148A (en) * | 2021-09-30 | 2022-01-04 | 中天宽带技术有限公司 | Battery short-circuit protection circuit and battery charging and discharging circuit |
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