CN112019189A - General design method of EMI filter for multiple modules of electric automobile - Google Patents
General design method of EMI filter for multiple modules of electric automobile Download PDFInfo
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- CN112019189A CN112019189A CN202010946078.8A CN202010946078A CN112019189A CN 112019189 A CN112019189 A CN 112019189A CN 202010946078 A CN202010946078 A CN 202010946078A CN 112019189 A CN112019189 A CN 112019189A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
Abstract
The invention discloses a universal design method of an EMI filter for multiple modules of an electric automobile, and relates to the field of EMI noise suppression of the electric automobile, wherein multiple converter modules comprise a motor inverter module, a DCDC converter module and other converter modules in the electric automobile. The method mainly comprises the following steps: 1) converting the switch control signal of the converter module into a voltage signal by using a frequency-voltage conversion circuit; 2) amplifying the voltage signal with the frequency information through a voltage amplifying circuit; 3) the cut-off frequency of the voltage-controlled low-pass filter circuit is changed by using the output voltage of the voltage amplifying circuit, so that the EMI noise of different converters is suppressed. The invention can effectively solve the problem of complicated design of the EMI filter caused by different switching working frequencies of different converter modules, and achieves the EMI noise suppression effect of the multi-module converter of the electric automobile by using a universal frequency self-adaptive EMI filter design method.
Description
Technical Field
The invention belongs to the technical field of electromagnetic compatibility of electric automobiles, and particularly relates to a universal design method for an EMI filter of multiple modules of an electric automobile.
Background
Nowadays, new energy electric vehicles have begun to be popularized on a large scale and have a tendency of gradually replacing fuel vehicles, however, problems in the related field of electric vehicle electromagnetic compatibility are increasingly prominent, and normal and safe operation of the whole vehicle is affected, so that electromagnetic compatibility problems such as electromagnetic interference of a converter module are urgently needed to be researched and broken through.
The electric automobile comprises a plurality of converter modules, wherein for example, a motor driving system module converts high-voltage direct current into adjustable three-phase alternating current to provide driving energy of a motor, and the motor driving system module is a key component for normal operation of the whole automobile; for another example, the DCDC converter system module mainly provides power voltage level conversion, converts high-voltage direct current into low-voltage direct current, and provides power supply energy for vehicle-mounted air conditioners, vehicle-mounted sound equipment, vehicle-mounted electronic instrument equipment and the like. However, since such inverter modules have the characteristics of high voltage and large current, and strong electromagnetic interference is generated due to the switching action influence of the internal switching devices, an EMI filter must be designed to suppress the conducted electromagnetic interference caused by the EMI filter.
The power circuit working modes under different working conditions are different, so that the electromagnetic interference noise generated by the converter modules is different, the current EMI filter is mainly designed for one specific converter module, and for various converter modules in the electric automobile, different switching frequencies can cause different levels of the electromagnetic interference noise, so that the cut-off frequencies of the corresponding filters are different, the EMI filters need to be designed for all the modules of the electric automobile in a complicated manner respectively, and a universal EMI filter design method for the converter modules with different switching frequencies is lacked.
Disclosure of Invention
In view of the problems in the prior art, an object of the present invention is to provide a general design method for a filter of multiple modules of an electric vehicle, in which the cutoff frequency of the designed filter changes adaptively with the switching frequency of an inverter, so as to satisfy the change of the EMI noise level suppression requirement caused by the switching frequency change, and thus, the design method can be applied to the EMI filter design of multiple inverter modules in a general way.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a general design method of an EMI filter aiming at multiple modules of an electric automobile comprises the following steps:
step 1: converting a driving signal of an electric automobile converter module into a voltage signal by using a frequency-voltage conversion circuit;
step 2: amplifying the voltage signal obtained in the step (1) through a voltage amplifying circuit;
and step 3: changing the cut-off frequency of the voltage-controlled low-pass filter circuit by using the output voltage of the voltage amplifying circuit obtained in the step (2);
and 4, step 4: and (3) integrating the circuits from the step 1 to the step 3 to form a frequency self-adaptive active EMI filter circuit, which can realize EMI noise suppression of different switch working frequency converter modules of the electric automobile.
The converter module of the electric vehicle includes, but is not limited to, an inverter module of a motor driving system, a DCDC converter module for high-low voltage power conversion, etc., and such modules may cause strong electromagnetic interference on a power cable due to sudden changes of voltage and current generated when a switching tube is operated.
The frequency-voltage conversion circuit in the step 1 has a function of converting a switch control signal carrying frequency information into a voltage signal carrying the frequency information.
The voltage-controlled low-pass filter circuit in the step 3 is a low-pass filter circuit with controllable cut-off frequency, and the change of the cut-off frequency is controlled by the amplified voltage carrying frequency information in the step 2.
The frequency-adaptive active EMI filter circuit in the step 4 is a circuit for adaptively adjusting the cut-off frequency of an EMI filter through a switching frequency, so that the electromagnetic noise interference suppression function of different converter modules in the electric automobile is realized.
The object of the invention is thus achieved.
The invention provides a universal design method for an EMI filter of multiple modules of an electric automobile, and relates to the field of EMI noise suppression of the electric automobile, wherein multiple converter modules comprise a motor inverter module, a DCDC converter module, other converter modules and the like in the electric automobile. The method mainly comprises the following steps: 1) converting the switch control signal of the converter module into a voltage signal by using a frequency-voltage conversion circuit; 2) amplifying the voltage signal with the frequency information through a voltage amplifying circuit; 3) the cut-off frequency of the voltage-controlled low-pass filter circuit is changed by using the output voltage of the voltage amplifying circuit, so that the EMI noise of different converters is suppressed. The invention can effectively solve the problem of complicated design of the EMI filter caused by different switching working frequencies of different converter modules, and achieves the EMI noise suppression effect of the multi-module converter of the electric automobile by using a universal frequency self-adaptive EMI filter design method.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: (1) the designed frequency self-adaptive active EMI filter can be suitable for inhibiting electromagnetic interference noise of various electric automobile converter modules, and the overall design workload is simplified; (2) the designed frequency self-adaptive active EMI filter can normally inhibit electromagnetic interference noise for different frequency working states of a specific converter module in an electric automobile; (3) the designed frequency self-adaptive active EMI filter circuit is simple in structure and easy to realize.
Drawings
FIG. 1 is a block diagram of a basic logic circuit of an embodiment of the present invention for a general design method of a multi-module EMI filter of an electric vehicle.
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
As shown in fig. 1, for a classic working circuit of an electric vehicle converter module, electric energy is converted from a power bus to electric energy that can be directly used by a load through a plurality of converter modules, wherein the plurality of electric vehicle converter modules include an inverter module, a DCDC converter module, other converter modules, and the like, and switching tubes in the converter modules control working states through switching control signals, but high-speed switching of each switching tube can cause a serious electromagnetic interference noise problem, so an EMI filter is required to be added between the power bus and the converter modules to filter electromagnetic interference.
The invention collects the frequency information fc of the switch control signal of the converter module, converts the switch signal into the voltage signal Vf1 with frequency information through the frequency-voltage conversion circuit, and the signal is amplified by the voltage amplification circuit to obtain Vf, and the signal controls the voltage-controlled low-pass filter circuit to achieve the purpose of changing the cut-off frequency of the EMI filter, so that the EMI filter can adapt to the converter modules with different switch frequencies, and the circuit comprises the source amplifier, therefore, the filter of the invention is called as a frequency self-adapting active EMI filter.
For the application of a frequency self-adaptive active EMI filter in multiple modules of an electric automobile, a power storage battery provides high-voltage electric energy for a high-voltage bus, the frequency self-adaptive active EMI filter which collects a switching control signal of a motor driving system supplies energy to the motor driving system, and the latter drives a motor to rotate and work. In addition, the frequency self-adaptive active EMI filter changes the cut-off frequency in a self-adaptive mode according to the collected switch control signals of the DCDC converter system, and high-voltage electric energy is transmitted to the DCDC converter system through the filter and is converted into low-voltage bus electric energy. Besides the above-mentioned systems, there are other converter systems, even between the low-voltage bus and some electric devices, and the invention can collect the switch control signals of different converters and apply them in the filter before each converter module, so as to implement the filtering function of the electromagnetic interference noise generated by them.
For a specific embodiment of the present invention, the present invention is a filter compensation circuit for voltage sampling voltage compensation, where Csen is a voltage sampling capacitor, and a sampling voltage Vi is a common-mode voltage on a power line, that is:
LM331 represents a frequency-voltage conversion circuit and a voltage amplification circuit based on a voltage-frequency conversion chip LM331, and is used for collecting a switch control signal fcConverting into voltage signal with frequency information and amplifying to obtain VfThe reference chip LM331 instruction manual can know that the frequency-voltage conversion coefficient of the reference circuit is k, so the circuit output voltage and the input signal frequency have the following relation:
Vf＝k·fc (2)
MLT04 represents a class of analog multipliers, in which the voltage signal Vf with frequency information is integrated into a filter circuit to implement a voltage control function, and the relationship between the output and input can be expressed as:
Vw＝0.4*Vx·Vf (3)
in the circuit, Ro is an output resistor, Co is an output compensation capacitor, R1, R2 and R3 are adjusting resistors, AD844 and the resistor-capacitor elements form a first-order low-pass filter circuit together, and the following formula can be derived according to kirchhoff's law:
in the joint type (2) - (5), the transfer function of the first-order filter circuit can be obtained as follows:
the cut-off frequency of the low-pass filter is thus
If the resistance value R of the resistance element is taken1＝R2＝R3When R, then the cut-off frequency can be simplified as:
the relation between the cut-off frequency and the frequency-voltage conversion coefficient, the value of the adjusting resistor, the value of the output compensating capacitor and the frequency of the input switch control signal can be known from the formula (7), so that the cut-off frequency of the filter can be changed along with the change of the frequency of the input signal by properly adjusting other parameter values, the filter can be suitable for the design of the EMI filter of the converter modules with different switching frequencies, and the design of the frequency-adaptive EMI filter aiming at multiple modules of the electric automobile can be further realized.
The invention can effectively solve the problem of electromagnetic interference noise caused by high-speed switching of the on-off states of various converter modules of the electric automobile, can conveniently and efficiently design an EMI filter for various converter modules in the electric automobile, effectively filters the electromagnetic interference noise of the converter of the electric automobile, and improves the stability of the whole automobile system.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (5)
1. A general design method of an EMI filter aiming at multiple modules of an electric automobile is characterized by comprising the following steps:
step 1: converting a driving signal of an electric automobile converter module into a voltage signal by using a frequency-voltage conversion circuit;
step 2: amplifying the voltage signal obtained in the step (1) through a voltage amplifying circuit;
and step 3: changing the cut-off frequency of the voltage-controlled low-pass filter circuit by using the output voltage of the voltage amplifying circuit obtained in the step (2);
and 4, step 4: and (3) integrating the circuits from the step 1 to the step 3 to form a frequency self-adaptive active EMI filter circuit, which can realize EMI noise suppression of different switch working frequency converter modules of the electric automobile.
2. The method for universal design of EMI filters for multiple modules of an electric vehicle of claim 1, wherein: the electric vehicle converter module in step 1 includes, but is not limited to, an inverter module of a motor drive system, a DCDC converter module for high-low voltage power conversion, and the like, and such modules may cause strong electromagnetic interference on a power cable due to sudden changes of voltage and current generated when a switching tube operates.
3. The method for universal design of EMI filters for multiple modules of an electric vehicle of claim 1, wherein: the frequency-voltage conversion circuit in the step 1 has the function of converting a square wave driving signal carrying frequency information into a voltage signal carrying the frequency information.
4. The method for universal design of EMI filters for multiple modules of an electric vehicle of claim 1, wherein: the voltage-controlled low-pass filter circuit in the step 3 is a low-pass filter circuit with controllable cut-off frequency, and the change of the cut-off frequency is controlled by the amplified voltage carrying frequency information in the step 2.
5. The method for universal design of EMI filters for multiple modules of an electric vehicle of claim 1, wherein: the frequency self-adaptive active EMI filter circuit in the step 4 is used for self-adaptively adjusting the cut-off frequency of the EMI filter through the switching frequency, so that the electromagnetic noise interference suppression function of different converter modules in the electric automobile is realized.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114430227A (en) * | 2022-02-07 | 2022-05-03 | Oppo广东移动通信有限公司 | Ripple voltage processing device and method and switching power supply |
| CN114679053A (en) * | 2022-04-15 | 2022-06-28 | Oppo广东移动通信有限公司 | Power supply system, control method thereof and electronic equipment |
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