Direct-current large-current ripple measuring device and method

A measuring device and high-current technology, which is applied in the field of precision measurement, can solve the problems of large DC large current ripple measurement error and low precision, and achieve the effect of solving large measurement error, reducing measurement error, and meeting the needs of precision measurement

Pending Publication Date: 2021-02-19
长沙天恒测控技术有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] On the one hand, the present invention provides a DC large current ripple measurement device to solve the existing technical problems of large DC large current ripple measurement error and low precision

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  • Direct-current large-current ripple measuring device and method
  • Direct-current large-current ripple measuring device and method

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Embodiment Construction

[0035] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0036] refer to figure 1 , a preferred embodiment of the present invention provides a DC large current ripple measuring device, comprising:

[0037] The DC comparator 1 is connected with the DC high current I1 circuit, and is used to obtain the reduced small current signal I2 according to a certain proportional factor;

[0038] A precision sampling resistor 2, both ends of which are connected to the output circuit of the DC comparator 1, for obtaining a voltage signal U1 at both ends of the precision sampling resistor 2;

[0039] A bandpass filter 3, the input end of which is connected to the circuit of the precision sampling resistor 2, is used to obtain the AC signal U2 of a specific freque...

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Abstract

The invention discloses a direct-current large-current ripple measuring device and method. The device comprises a direct-current comparator which is in circuit connection with a direct-current large-current I1, and is used for obtaining a reduced small-current signal I2 according to a certain scale factor, a precision sampling resistor with two ends in circuit connection with the output end of thedirect-current comparator for obtaining voltage signals U1 at the two ends of the precision sampling resistor, and a band-pass filter with the input end in circuit connection with the precision sampling resistor 2 for obtaining an alternating current signal U2 of a specific frequency band to be measured. The alternating current signal U2 is sent to a thermoelectric conversion system, and an effective value of the alternating current signal U2 is obtained through a solid-state thermal true effective value converter. The defect of large direct measurement error is solved, the error in the measurement process is greatly reduced, the effect of precisely and accurately measuring the direct-current large-current ripple is achieved, and the precise measurement requirement of the direct-current large-current ripple in electric energy metering can be met.

Description

technical field [0001] The invention relates to the field of precision measurement, in particular to a DC large current ripple measuring device and method. Background technique [0002] With the rapid development and wide application of electric vehicles in recent years, the requirements for DC electric energy measurement are getting higher and higher, and a stable DC high current source is usually required. However, in practical applications, due to the use of switching power supplies, the DC current will contain a large number of ripples, which will cause errors in energy measurement. In 2017, the country implemented GB / T 33708-2017 "Static DC Electric Energy Meter", which clarified the method of DC ripple influence test and the error change limit. So we need to measure the DC large current ripple in the circuit. The traditional DC ripple measurement method is generally direct measurement, which is realized by connecting a shunt in series. The AC voltage on the shunt is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/02
CPCG01R19/02
Inventor 周新华黄启宇
Owner 长沙天恒测控技术有限公司
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