CN113922659B - Active EMI filter capable of self-supplying power - Google Patents
Active EMI filter capable of self-supplying power Download PDFInfo
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- CN113922659B CN113922659B CN202111188012.8A CN202111188012A CN113922659B CN 113922659 B CN113922659 B CN 113922659B CN 202111188012 A CN202111188012 A CN 202111188012A CN 113922659 B CN113922659 B CN 113922659B
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- 238000001514 detection method Methods 0.000 claims abstract description 54
- 238000002347 injection Methods 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims description 163
- 230000005540 biological transmission Effects 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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Abstract
The invention belongs to the technical field of power electronics, and particularly relates to an active EMI filter capable of being supplied with power by self, which is suitable for an electric drive system of an electric vehicle and comprises the following components: the detection circuit, the noise processing circuit, the self-supply power circuit and the current injection circuit are connected between the direct current power supply and the inverter, and can effectively inhibit common mode noise current in the direct current bus. Compared with the traditional active filter, the active EMI filter capable of being automatically powered provided by the invention utilizes noise energy to power, so that energy is effectively saved.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to an active EMI filter capable of self-supplying power, which is suitable for an electric drive system of an electric vehicle.
Background
The electric driving system of the electric vehicle mainly comprises a direct current power supply, a motor controller (inverter) and a motor, wherein the current motor controller widely adopts Pulse Width Modulation (PWM), and a switching device can form strong transient interference in the process of quick switching on and switching off and mainly adopts common mode noise.
Common mode noise generated by the motor controller is conducted to a direct current power supply (typically, a battery pack) along a direct current bus, and causes damage to the power supply, and also affects the normal operation of a Battery Management System (BMS). Electric vehicles integrate a large number of electric equipment in a limited space, wherein the electric vehicles are not lack of precise acquisition control equipment and communication navigation equipment, the electric vehicles are very sensitive to electromagnetic interference, and common mode noise can radiate high-frequency electromagnetic energy outwards in the process of transmitting along a line, so that the normal operation of the equipment is threatened.
One effective means of suppressing electromagnetic interference (EMI) is to provide an EMI filter. For vehicle applications, an excellent EMI filter is required to have not only good noise suppression capability, but also small size and light weight to accommodate limited space in the vehicle. The size of a traditional passive filter is positively correlated with power, and the larger the power is, the larger the size is, and a plurality of limitations exist in the application field of the vehicle electric drive system. In contrast, the volume of the active filter is less affected by power, the volume occupation is greatly reduced under the condition of realizing the same noise suppression capability, and the inductance saturation problem of the conventional passive filter does not occur.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems that: how to provide an active EMI filter that may be used in an electric vehicle electric drive system.
(II) technical scheme
To solve the above technical problem, the present invention provides an active EMI filter capable of self-supplying power, which includes: the device comprises a self-supply circuit, a detection circuit, a noise processing circuit and a current injection circuit; wherein,
the first end and the second end of the detection circuit are respectively connected with the positive bus and the negative bus, the third end of the detection circuit is connected with the shell of the machine to be grounded, and the fourth end of the detection circuit is connected with the first end of the noise processing circuit;
the second end of the noise processing circuit is connected with the third end of the self-supply power supply circuit, the third end of the noise processing circuit is connected with the fourth end of the self-supply power supply circuit, the fourth end of the noise processing circuit is connected with the first end of the current injection circuit, and the fifth end of the noise processing circuit is connected with the machine shell to be grounded;
the second end and the third end of the current injection circuit are respectively connected with a positive bus and a negative bus, and the fourth end of the current injection circuit is connected with the machine shell to be grounded;
the first end and the second end of the self-supporting power supply circuit are respectively connected with the positive bus and the negative bus;
the detection circuit is used for detecting the common mode voltage on the direct current bus;
the noise processing circuit is used for carrying out inverse amplification on the detected common-mode voltage and forming output voltage output;
the self-supply power supply circuit is used for extracting noise energy on the direct current bus and supplying power to the noise processing circuit;
the current injection circuit is used for converting the output voltage of the noise processing circuit into current and injecting the current into the direct current bus to counteract common mode noise current.
Wherein the detection circuit includes: the first capacitor, the second capacitor, the first resistor and the second resistor;
the first end of the first capacitor is a first end of the detection circuit, and the second end of the first capacitor is a fourth end of the detection circuit and is connected with the first end of the first resistor;
the second end of the first resistor is a third end of the detection circuit;
the first end of the second capacitor is a second end of the detection circuit, and the second end of the second capacitor is a fourth end of the detection circuit and is connected with the first end of the second resistor;
the second end of the second resistor is a third end of the detection circuit.
The first capacitor and the second capacitor are blocking capacitors for isolating direct current components in the power loop, and alternating current noise components are applied to a first resistor and a second resistor serving as detection resistors, and the sum of voltages of the first resistor and the second resistor is common mode voltage.
Wherein the noise processing circuit includes: the operational amplifier, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor;
the first end of the third resistor is the first end of the noise processing unit circuit, and the second end of the third resistor and the first end of the fifth resistor are commonly connected with the inverting input end of the operational amplifier;
the first end of the fourth resistor is commonly connected with the second end of the sixth resistor and is a fifth end of the noise processing unit circuit, and the second end of the fourth resistor is connected with the non-inverting input end of the operational amplifier;
the second end of the fifth resistor and the first end of the sixth resistor are commonly connected with the output end of the operational amplifier and are the fourth end of the noise processing circuit;
the positive electrode power supply end of the operational amplifier is a second end of the noise processing circuit, and the negative electrode power supply end of the operational amplifier is a third end of the noise processing circuit.
The noise processing circuit is used for constructing an inverting proportion amplifier by taking the operational amplifier as a core, the gain of the inverting proportion amplifier is determined by the ratio between the third resistor and the fifth resistor, and the detected common-mode voltage is output to the circuit injection circuit after inverting amplification.
Wherein the self-contained power supply circuit comprises: the first inductor, the third capacitor, the fourth capacitor, the fifth capacitor, the impedance matching network, the first rectifying diode and the second rectifying diode;
the first end of the first inductor is a first end of the self-supply circuit, and the second end of the first inductor is connected with the first end of the third capacitor;
the second end of the third capacitor is connected with the first end of the impedance matching network, and the second end of the impedance matching network is connected with the first end of the fourth capacitor;
the cathode of the first rectifying diode and the anode of the second rectifying diode are connected to the second end of the fourth capacitor;
the first end of the fifth capacitor is commonly connected with the anode of the first rectifying diode and is a third end of the self-supply circuit;
the cathode of the second rectifying diode is commonly connected with the second end of the fifth capacitor, and the second end and the fourth end of the self-supply circuit are formed.
The LC resonance network formed by the first inductor and the third capacitor is used for extracting differential mode noise signals on the direct current bus, and the resonant frequency of the resonance network is changed by adjusting the values of the first inductor and the third capacitor, so that differential mode noise energy with different frequencies is extracted;
the impedance matching network is used for adjusting the phase of differential mode noise energy to realize the maximum efficiency transmission of energy; the noise energy is processed by a rectifying and filtering circuit consisting of a fourth capacitor, a fifth capacitor, a first rectifying diode and a second rectifying diode to obtain stable direct-current voltage, and the stable direct-current voltage is used for supplying power to an operational amplifier in the noise processing circuit.
The current injection circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a sixth capacitor and a seventh capacitor;
the second end of the seventh resistor, the second end of the eighth resistor and the first end of the ninth resistor are connected together and are the first ends of the current injection circuit;
the second end of the ninth resistor is a fourth end of the current injection circuit;
the second end of the sixth capacitor is connected with the first end of the seventh resistor, and the first end is the third end of the current injection circuit;
the second end of the seventh capacitor is connected with the first end of the eighth resistor, and the first end is the second end of the current injection circuit.
The sixth capacitor and the seventh capacitor are blocking capacitors used for isolating the influence of direct current components on the bus, and the voltage output by the noise processing circuit is converted into offset current with opposite phase to common mode noise after passing through a seventh resistor and an eighth resistor; the ninth resistor is used for preventing short circuit.
Wherein the impedance matching network in the self-contained power supply circuit comprises: tenth resistor, eleventh resistor, twelfth resistor, eighth capacitor, ninth capacitor, and tenth capacitor;
the first ends of the tenth resistor, the eleventh resistor and the twelfth resistor are commonly connected and are the first ends of the impedance matching network, and the second end of the tenth resistor is connected with the first end of the eighth capacitor;
the second end of the eleventh resistor is connected with the first end of the ninth capacitor;
the second end of the twelfth resistor is connected with the first end of the tenth capacitor;
the second ends of the eighth capacitor, the ninth capacitor and the tenth capacitor are commonly connected and are the second ends of the impedance matching network;
the tenth resistor, the eleventh resistor, the twelfth resistor, the eighth capacitor, the ninth capacitor and the tenth capacitor are used for adjusting the phase of the transmission signal, so that the maximization of functional capacity transmission is realized.
(III) beneficial effects
Compared with the prior art, the active EMI filter which can be used in the electric drive system of the electric vehicle is connected between the direct-current power supply and the inverter of the electric vehicle, so that common-mode noise current on the direct-current bus of the electric vehicle can be effectively restrained, self-supply power is realized by utilizing noise energy, independent external power supply is not needed, extra consumption is not added to the system, and energy is saved.
Drawings
FIG. 1 is a functional block diagram of a self-powered active EMI filter in accordance with the present invention;
FIG. 2 is a circuit block diagram of a detection circuit in a self-powered active EMI filter according to the present invention;
FIG. 3 is a circuit block diagram of a noise handling circuit in a self-powered active EMI filter according to the present invention;
FIG. 4 is a circuit block diagram of a self-contained power supply circuit in a self-contained power-capable active EMI filter in accordance with the present invention;
FIG. 5 is a circuit block diagram of a current injection circuit in a self-powered active EMI filter according to the present invention;
fig. 6 is a circuit configuration diagram of an impedance matching network in a self-powered circuit in a self-powered active EMI filter according to the present invention.
Detailed Description
For the purposes of clarity, content, and advantages of the present invention, a detailed description of the embodiments of the present invention will be described in detail below with reference to the drawings and examples.
To solve the above technical problem, the present invention provides an active EMI filter capable of self-supplying power, which includes: the device comprises a self-supply circuit, a detection circuit, a noise processing circuit and a current injection circuit; wherein,
the first end and the second end of the detection circuit are respectively connected with the positive bus and the negative bus, the third end of the detection circuit is connected with the shell of the machine to be grounded, and the fourth end of the detection circuit is connected with the first end of the noise processing circuit;
the second end of the noise processing circuit is connected with the third end of the self-supply power supply circuit, the third end of the noise processing circuit is connected with the fourth end of the self-supply power supply circuit, the fourth end of the noise processing circuit is connected with the first end of the current injection circuit, and the fifth end of the noise processing circuit is connected with the machine shell to be grounded;
the second end and the third end of the current injection circuit are respectively connected with a positive bus and a negative bus, and the fourth end of the current injection circuit is connected with the machine shell to be grounded;
the first end and the second end of the self-supporting power supply circuit are respectively connected with the positive bus and the negative bus;
the detection circuit is used for detecting the common mode voltage on the direct current bus;
the noise processing circuit is used for carrying out inverse amplification on the detected common-mode voltage and forming output voltage output;
the self-supply power supply circuit is used for extracting noise energy on the direct current bus and supplying power to the noise processing circuit;
the current injection circuit is used for converting the output voltage of the noise processing circuit into current and injecting the current into the direct current bus to counteract common mode noise current.
Wherein the detection circuit includes: the first capacitor, the second capacitor, the first resistor and the second resistor;
the first end of the first capacitor is a first end of the detection circuit, and the second end of the first capacitor is a fourth end of the detection circuit and is connected with the first end of the first resistor;
the second end of the first resistor is a third end of the detection circuit;
the first end of the second capacitor is a second end of the detection circuit, and the second end of the second capacitor is a fourth end of the detection circuit and is connected with the first end of the second resistor;
the second end of the second resistor is a third end of the detection circuit.
The first capacitor and the second capacitor are blocking capacitors for isolating direct current components in the power loop, and alternating current noise components are applied to a first resistor and a second resistor serving as detection resistors, and the sum of voltages of the first resistor and the second resistor is common mode voltage.
Wherein the noise processing circuit includes: the operational amplifier, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor;
the first end of the third resistor is the first end of the noise processing unit circuit, and the second end of the third resistor and the first end of the fifth resistor are commonly connected with the inverting input end of the operational amplifier;
the first end of the fourth resistor is commonly connected with the second end of the sixth resistor and is a fifth end of the noise processing unit circuit, and the second end of the fourth resistor is connected with the non-inverting input end of the operational amplifier;
the second end of the fifth resistor and the first end of the sixth resistor are commonly connected with the output end of the operational amplifier and are the fourth end of the noise processing circuit;
the positive electrode power supply end of the operational amplifier is a second end of the noise processing circuit, and the negative electrode power supply end of the operational amplifier is a third end of the noise processing circuit.
The noise processing circuit is used for constructing an inverting proportion amplifier by taking the operational amplifier as a core, the gain of the inverting proportion amplifier is determined by the ratio between the third resistor and the fifth resistor, and the detected common-mode voltage is output to the circuit injection circuit after inverting amplification.
Wherein the self-contained power supply circuit comprises: the first inductor, the third capacitor, the fourth capacitor, the fifth capacitor, the impedance matching network, the first rectifying diode and the second rectifying diode;
the first end of the first inductor is a first end of the self-supply circuit, and the second end of the first inductor is connected with the first end of the third capacitor;
the second end of the third capacitor is connected with the first end of the impedance matching network, and the second end of the impedance matching network is connected with the first end of the fourth capacitor;
the cathode of the first rectifying diode and the anode of the second rectifying diode are connected to the second end of the fourth capacitor;
the first end of the fifth capacitor is commonly connected with the anode of the first rectifying diode and is a third end of the self-supply circuit;
the cathode of the second rectifying diode is commonly connected with the second end of the fifth capacitor, and the second end and the fourth end of the self-supply circuit are formed.
The LC resonance network formed by the first inductor and the third capacitor is used for extracting differential mode noise signals on the direct current bus, and the resonant frequency of the resonance network is changed by adjusting the values of the first inductor and the third capacitor, so that differential mode noise energy with different frequencies is extracted;
the impedance matching network is used for adjusting the phase of differential mode noise energy to realize the maximum efficiency transmission of energy; the noise energy is processed by a rectifying and filtering circuit consisting of a fourth capacitor, a fifth capacitor, a first rectifying diode and a second rectifying diode to obtain stable direct-current voltage, and the stable direct-current voltage is used for supplying power to an operational amplifier in the noise processing circuit.
The current injection circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a sixth capacitor and a seventh capacitor;
the second end of the seventh resistor, the second end of the eighth resistor and the first end of the ninth resistor are connected together and are the first ends of the current injection circuit;
the second end of the ninth resistor is a fourth end of the current injection circuit;
the second end of the sixth capacitor is connected with the first end of the seventh resistor, and the first end is the third end of the current injection circuit;
the second end of the seventh capacitor is connected with the first end of the eighth resistor, and the first end is the second end of the current injection circuit.
The sixth capacitor and the seventh capacitor are blocking capacitors used for isolating the influence of direct current components on the bus, and the voltage output by the noise processing circuit is converted into offset current with opposite phase to common mode noise after passing through a seventh resistor and an eighth resistor; the ninth resistor is used for preventing short circuit.
Wherein the impedance matching network in the self-contained power supply circuit comprises: tenth resistor, eleventh resistor, twelfth resistor, eighth capacitor, ninth capacitor, and tenth capacitor;
the first ends of the tenth resistor, the eleventh resistor and the twelfth resistor are commonly connected and are the first ends of the impedance matching network, and the second end of the tenth resistor is connected with the first end of the eighth capacitor;
the second end of the eleventh resistor is connected with the first end of the ninth capacitor;
the second end of the twelfth resistor is connected with the first end of the tenth capacitor;
the second ends of the eighth capacitor, the ninth capacitor and the tenth capacitor are commonly connected and are the second ends of the impedance matching network;
the tenth resistor, the eleventh resistor, the twelfth resistor, the eighth capacitor, the ninth capacitor and the tenth capacitor are used for adjusting the phase of the transmission signal, so that the maximization of functional capacity transmission is realized.
Example 1
In this embodiment, according to fig. 1, a functional block diagram of an active EMI filter capable of self-supplying power according to the present invention is shown, which is described in detail below:
as shown in fig. 1, the active EMI filter capable of self-supplying power is connected to a dc power supply 1 and an inverter 2, respectively, and includes a detection circuit 10, a noise processing circuit 20, a self-supplying power circuit 30, and a current injection circuit 40.
The first end and the second end of the detection circuit 10 are respectively connected with positive and negative buses, the third end is connected with the shell of the machine to be grounded, and the fourth end is connected with the first end of the noise processing circuit 20; the second end of the noise processing circuit 20 is connected with the third end of the self-supply circuit 30, the third end is connected with the fourth end of the self-supply circuit 30, the fourth end is connected with the first end of the current injection circuit 40, and the fifth end is connected with the machine shell ground; the second end and the third end of the current injection circuit 40 are respectively connected with positive and negative buses, and the fourth end is connected with the shell of the machine to be grounded; the first end and the second end of the self-supplied power circuit 30 are respectively connected with the positive bus and the negative bus;
a detection circuit 10 for detecting a common mode voltage on the dc bus; a noise processing circuit 20 for inverting-amplifying and outputting the detected common mode voltage; the self-supply circuit 30 is configured to extract noise energy on the dc bus and supply power to the noise processing circuit 20; the current injection circuit 40 is used for converting the output voltage of the noise processing circuit 20 into current and injecting the current into the direct current bus to counteract the common mode noise current.
Fig. 2 shows a detection circuit 10 of a self-powered active EMI filter according to the present invention, which is described in detail below:
as shown in fig. 2, the detection circuit 10 includes a detection circuit including a first capacitor C1, a second capacitor C2, a first resistor R1, and a second resistor R2;
the first end of the first capacitor C1 is a first end of the detection circuit 10, and the second end of the first capacitor C1 is a fourth end of the detection circuit 10 and is connected with the first end of the first resistor R1; the second end of the first resistor R1 is a third end of the detection circuit 10; the first end of the second capacitor C2 is a second end of the detection circuit 10, and the second end is a fourth end of the detection circuit 10 and is connected with the first end of the second resistor R2; the second terminal of the second resistor R2 is a third terminal of the detection circuit 10.
The first capacitor C1 and the second capacitor C2 are dc blocking capacitors for isolating dc components in the power loop, and ac noise components are applied to the detection resistors R1 and R2, and the sum of voltages across the first resistor R1 and the second resistor R2 is a common mode voltage.
Fig. 3 shows a noise processing circuit 20 of a self-powered active EMI filter according to the present invention, which is described in detail below:
as shown in fig. 3, the noise processing circuit 20 includes an operational amplifier, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6;
the first end of the third resistor R3 is the first end of the noise processing unit circuit 20, the second end of the third resistor R3 and the first end of the fifth resistor R5 are commonly connected with the inverting input end of the operational amplifier, the first end of the fourth resistor R4 and the second end of the sixth resistor R6 are commonly connected and are the fifth end of the noise processing unit circuit 20, the second end of the fourth resistor R4 is connected with the non-inverting input end of the operational amplifier, the second end of the fifth resistor R5 and the first end of the sixth resistor R6 are commonly connected with the output end of the operational amplifier and are the fourth end of the noise processing circuit 20, the positive electrode power supply end of the operational amplifier is the second end of the noise processing circuit 20, and the negative electrode power supply end of the operational amplifier is the third end of the noise processing circuit 20.
The core of the noise processing circuit 20 is to construct an inverting proportional amplifier around the operational amplifier, the gain of which is determined by the ratio between the third resistor R3 and the fifth resistor R5, and the detected common-mode voltage is output to the circuit injection circuit 40 after inverting amplification.
Fig. 4 shows a self-contained power supply circuit 30 of a self-contained powered active EMI filter according to the present invention, as follows:
as shown in fig. 4, the self-supplied power circuit 30 includes a first inductor L1, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, an impedance matching network 100, a first rectifying diode D1, and a second rectifying diode D2;
the first end of the first inductor L1 is a first end of the self-supply circuit 30, the second end of the first inductor L1 is connected with the first end of the third capacitor C3, the second end of the third capacitor C3 is connected with the first end of the impedance matching network 100, the second end of the impedance matching network 100 is connected with the first end of the fourth capacitor C4, the cathode of the first rectifying diode D1 and the anode of the second rectifying diode D2 are commonly connected with the second end of the fourth capacitor C4, and the first end of the fifth capacitor C5 and the anode of the first rectifying diode D1 are commonly connected to be a third end of the self-supply circuit 30; the cathode of the second rectifying diode D2 and the second end of the fifth capacitor C5 are commonly connected to the second end and the fourth end of the self-supply circuit 30.
The LC resonance network formed by the first inductor L1 and the third capacitor C3 can extract differential mode noise signals on the direct current bus, and the resonance frequency of the resonance network can be changed by adjusting the values of the first inductor L1 and the third capacitor C3, so that differential mode noise energy of different frequencies is extracted; the impedance matching network 100 is used for adjusting the phase of differential mode noise energy to realize the maximum efficiency transmission of energy; the noise energy is processed by a rectifying and filtering circuit consisting of a fourth capacitor C4, a fifth capacitor C5, a first rectifying diode D1 and a second rectifying diode D2 to obtain stable direct-current voltage, and the stable direct-current voltage is used for supplying power to an operational amplifier in the noise processing circuit 20.
Fig. 5 shows a current injection circuit 40 of a self-powered active EMI filter according to the present invention, which is described in detail below:
as shown in fig. 5, the current injection circuit 40 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a sixth capacitor C6, and a seventh capacitor C7;
the second end of the seventh resistor R7, the second end of the eighth resistor R8 and the first end of the ninth resistor R9 are commonly connected and are the first end of the current injection circuit 40, the second end of the ninth resistor R9 is the fourth end of the current injection circuit 40, the second end of the sixth capacitor C6 is connected with the first end of the seventh resistor R7, the first end is the third end of the current injection circuit 40, the second end of the seventh capacitor C7 is connected with the first end of the eighth resistor R8, and the first end is the second end of the current injection circuit 40.
The sixth capacitor C6 and the seventh capacitor C7 are blocking capacitors, and are used for isolating the influence of the dc component on the bus, the voltage output by the noise processing circuit 20 is converted into the counter current with the opposite phase to the common mode noise after passing through the seventh resistor R7 and the eighth resistor R8, and the ninth resistor R9 is used for preventing short circuit.
Fig. 6 shows an impedance matching network 100 in a self-supplied circuit 30 of a self-powered active EMI filter according to the present invention, which is described in detail below:
as shown in fig. 6, the impedance matching network 100 in the self-supplied power circuit 30 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, an eighth capacitor C8, a ninth capacitor C9, and a tenth capacitor C10;
the first ends of the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 are commonly connected and are the first ends of the impedance matching network 100, the second end of the tenth resistor R10 is connected with the first end of the eighth capacitor C8, the second end of the eleventh resistor R11 is connected with the first end of the ninth capacitor C9, the second end of the twelfth resistor R12 is connected with the first end of the tenth capacitor C10, and the second ends of the eighth capacitor C8, the ninth capacitor C9 and the tenth capacitor C10 are commonly connected and are the second ends of the impedance matching network 100.
The tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are used for adjusting the phase of the transmission signal, so as to maximize the transmission of the functional power.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (5)
1. A self-energizable active EMI filter comprising: the device comprises a self-supply circuit, a detection circuit, a noise processing circuit and a current injection circuit; wherein,
the first end and the second end of the detection circuit are respectively connected with the positive bus and the negative bus, the third end of the detection circuit is connected with the shell of the machine to be grounded, and the fourth end of the detection circuit is connected with the first end of the noise processing circuit;
the second end of the noise processing circuit is connected with the third end of the self-supply power supply circuit, the third end of the noise processing circuit is connected with the fourth end of the self-supply power supply circuit, the fourth end of the noise processing circuit is connected with the first end of the current injection circuit, and the fifth end of the noise processing circuit is connected with the machine shell to be grounded;
the second end and the third end of the current injection circuit are respectively connected with a positive bus and a negative bus, and the fourth end of the current injection circuit is connected with the machine shell to be grounded;
the first end and the second end of the self-supporting power supply circuit are respectively connected with the positive bus and the negative bus;
the detection circuit is used for detecting the common mode voltage on the direct current bus;
the noise processing circuit is used for carrying out inverse amplification on the detected common-mode voltage and forming output voltage output;
the self-supply power supply circuit is used for extracting noise energy on the direct current bus and supplying power to the noise processing circuit;
the current injection circuit is used for converting the output voltage of the noise processing circuit into current and injecting the current into the direct current bus to counteract common mode noise current;
the detection circuit includes: the first capacitor, the second capacitor, the first resistor and the second resistor;
the first end of the first capacitor is a first end of the detection circuit, and the second end of the first capacitor is a fourth end of the detection circuit and is connected with the first end of the first resistor;
the second end of the first resistor is a third end of the detection circuit;
the first end of the second capacitor is a second end of the detection circuit, and the second end of the second capacitor is a fourth end of the detection circuit and is connected with the first end of the second resistor;
the second end of the second resistor is a third end of the detection circuit;
the first capacitor and the second capacitor are blocking capacitors for isolating direct current components in the power loop, and alternating current noise components are applied to a first resistor and a second resistor which are used as detection resistors, wherein the sum of voltages of the first resistor and the second resistor is common mode voltage;
the noise processing circuit includes: the operational amplifier, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor;
the first end of the third resistor is the first end of the noise processing unit circuit, and the second end of the third resistor and the first end of the fifth resistor are commonly connected with the inverting input end of the operational amplifier;
the first end of the fourth resistor is commonly connected with the second end of the sixth resistor and is a fifth end of the noise processing unit circuit, and the second end of the fourth resistor is connected with the non-inverting input end of the operational amplifier;
the second end of the fifth resistor and the first end of the sixth resistor are commonly connected with the output end of the operational amplifier and are the fourth end of the noise processing circuit;
the positive electrode power supply end of the operational amplifier is a second end of the noise processing circuit, and the negative electrode power supply end of the operational amplifier is a third end of the noise processing circuit;
the noise processing circuit is used for constructing an inverting proportion amplifier by taking the operational amplifier as a core, the gain of the inverting proportion amplifier is determined by the ratio between the third resistor and the fifth resistor, and the detected common-mode voltage is output to the circuit injection circuit after inverting amplification;
the self-contained power supply circuit includes: the first inductor, the third capacitor, the fourth capacitor, the fifth capacitor, the impedance matching network, the first rectifying diode and the second rectifying diode;
the first end of the first inductor is a first end of the self-supply circuit, and the second end of the first inductor is connected with the first end of the third capacitor;
the second end of the third capacitor is connected with the first end of the impedance matching network, and the second end of the impedance matching network is connected with the first end of the fourth capacitor;
the cathode of the first rectifying diode and the anode of the second rectifying diode are connected to the second end of the fourth capacitor;
the first end of the fifth capacitor is commonly connected with the anode of the first rectifying diode and is a third end of the self-supply circuit;
the cathode of the second rectifying diode is commonly connected with the second end of the fifth capacitor, and the second end and the fourth end of the self-supply circuit are formed.
2. The self-powered active EMI filter of claim 1 wherein the LC resonant network comprising the first inductor and the third capacitor is configured to extract differential mode noise signals on the dc bus, and the resonant frequency of the resonant network is changed by adjusting the values of the first inductor and the third capacitor, so as to extract differential mode noise energy of different frequencies;
the impedance matching network is used for adjusting the phase of differential mode noise energy to realize the maximum efficiency transmission of energy; the noise energy is processed by a rectifying and filtering circuit consisting of a fourth capacitor, a fifth capacitor, a first rectifying diode and a second rectifying diode to obtain stable direct-current voltage, and the stable direct-current voltage is used for supplying power to an operational amplifier in the noise processing circuit.
3. The self-energizable active EMI filter of claim 1 wherein the current injection circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a sixth capacitor, and a seventh capacitor;
the second end of the seventh resistor, the second end of the eighth resistor and the first end of the ninth resistor are connected together and are the first ends of the current injection circuit;
the second end of the ninth resistor is a fourth end of the current injection circuit;
the second end of the sixth capacitor is connected with the first end of the seventh resistor, and the first end is the third end of the current injection circuit;
the second end of the seventh capacitor is connected with the first end of the eighth resistor, and the first end is the second end of the current injection circuit.
4. The self-powered active EMI filter of claim 3 wherein the sixth capacitor and the seventh capacitor are dc blocking capacitors for isolating dc components on the bus from each other, and wherein the voltage output by the noise processing circuit is converted to a counter current in anti-phase with the common mode noise through the seventh resistor and the eighth resistor; the ninth resistor is used for preventing short circuit.
5. The self-energizable active EMI filter of claim 3, wherein the impedance matching network in the self-powering circuit comprises: tenth resistor, eleventh resistor, twelfth resistor, eighth capacitor, ninth capacitor, and tenth capacitor;
the first ends of the tenth resistor, the eleventh resistor and the twelfth resistor are commonly connected and are the first ends of the impedance matching network, and the second end of the tenth resistor is connected with the first end of the eighth capacitor;
the second end of the eleventh resistor is connected with the first end of the ninth capacitor;
the second end of the twelfth resistor is connected with the first end of the tenth capacitor;
the second ends of the eighth capacitor, the ninth capacitor and the tenth capacitor are commonly connected and are the second ends of the impedance matching network;
the tenth resistor, the eleventh resistor, the twelfth resistor, the eighth capacitor, the ninth capacitor and the tenth capacitor are used for adjusting the phase of the transmission signal, so that the maximization of functional capacity transmission is realized.
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| WO2004001927A2 (en) * | 2002-06-25 | 2003-12-31 | International Rectifier Corporation | Active emi filter |
| CN105548849A (en) * | 2016-02-19 | 2016-05-04 | 西安交通大学 | Local discharge testing circuit and method for high-voltage direct current cable |
| CN108418569A (en) * | 2018-05-25 | 2018-08-17 | 敏业信息科技（上海）有限公司 | Differential mode electromagnetic noise injection network and active electromagnetic interference filter |
| CN108631292A (en) * | 2017-03-17 | 2018-10-09 | 沙夫纳 Emv 股份公司 | Active filter |
| JP2020088627A (en) * | 2018-11-27 | 2020-06-04 | 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． | Noise suppression circuit |
| CN112234951A (en) * | 2019-07-15 | 2021-01-15 | 乐金电子研发中心(上海)有限公司 | Common mode active EMI filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2004001927A2 (en) * | 2002-06-25 | 2003-12-31 | International Rectifier Corporation | Active emi filter |
| CN105548849A (en) * | 2016-02-19 | 2016-05-04 | 西安交通大学 | Local discharge testing circuit and method for high-voltage direct current cable |
| CN108631292A (en) * | 2017-03-17 | 2018-10-09 | 沙夫纳 Emv 股份公司 | Active filter |
| CN108418569A (en) * | 2018-05-25 | 2018-08-17 | 敏业信息科技（上海）有限公司 | Differential mode electromagnetic noise injection network and active electromagnetic interference filter |
| JP2020088627A (en) * | 2018-11-27 | 2020-06-04 | 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． | Noise suppression circuit |
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