CN113691120A - Power filter for PWM power amplifying circuit - Google Patents
Power filter for PWM power amplifying circuit Download PDFInfo
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- CN113691120A CN113691120A CN202110803304.1A CN202110803304A CN113691120A CN 113691120 A CN113691120 A CN 113691120A CN 202110803304 A CN202110803304 A CN 202110803304A CN 113691120 A CN113691120 A CN 113691120A
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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
- H02M1/14—Arrangements for reducing ripples from DC input or output
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Abstract
One embodiment of the present invention discloses a power filter for a PWM power amplifying circuit, the power filter including: the device comprises a first filtering unit, a second filtering unit and a third filtering unit; wherein the first to third input terminals of the first filtering unit receive a power supply voltage; the first to third output ends of the first filtering unit are respectively connected with the first to third input ends of the second filtering unit; the first to third output ends of the second filtering unit are respectively connected with the first to third input ends of the third filtering unit; the first to third output terminals of the third filtering unit serve as output terminals of the power supply filter.
Description
Technical Field
The invention relates to the technical field of power filters, in particular to a power filter for a PWM power amplifying circuit.
Background
When the PWM (Pulse Width Modulation) power amplifying circuit works with load, the generated output voltage is a series of PWM Pulse voltages, the amplitude of the PWM Pulse voltages is direct current bus voltage (100V-300V), the switching frequency is 10 kHz-20 kHz, the Pulse Width is input and adjusted by a control end, because inductance and capacitance devices exist in the circuit, the wiring of the switching device has stray inductance and capacitance, dv/dt (voltage change rate) generated by the PWM Pulse voltages can generate a Pulse current through the capacitance, di/dt (current change rate) generates a Pulse voltage through the action of the inductance, a current loop with large di/dt is also a radiation source, the current loop can form strong electromagnetic interference to a space radiation electromagnetic field, the limit value requirement of EMC (electromagnetic compatibility) standard is seriously exceeded, in order to reduce the electromagnetic interference brought by the PWM power amplifying circuit as an interference source to a power input end, a power input filter is required.
Disclosure of Invention
An object of the present invention is to provide a power filter for a PWM power amplifying circuit, which reduces conducted interference between devices using the same power supply and enhances electromagnetic compatibility of the entire PWM power amplifying circuit system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the present invention provides a power filter for a PWM power amplifying circuit, the power filter comprising:
the device comprises a first filtering unit, a second filtering unit and a third filtering unit;
wherein,
first to third input terminals of the first filtering unit receive a power supply voltage;
the first to third output ends of the first filtering unit are respectively connected with the first to third input ends of the second filtering unit;
the first to third output ends of the second filtering unit are respectively connected with the first to third input ends of the third filtering unit;
the first to third output terminals of the third filtering unit serve as output terminals of the power supply filter.
In a specific embodiment, the first filtering unit includes:
the circuit comprises a first common-mode inductor, a first differential-mode capacitor, a second differential-mode capacitor, a third differential-mode capacitor, a first common-mode capacitor, a second common-mode capacitor and a third common-mode capacitor;
wherein,
a first input end of the first common mode inductor is connected with a first end of the third differential mode capacitor and receives a power supply voltage;
a first output end of the first common mode inductor is connected with a first end of the first common mode capacitor;
the second end of the first common-mode capacitor is grounded;
the second input end of the first common mode inductor is connected with the first end of the second differential mode capacitor and receives a power supply voltage;
the second output end of the first common-mode inductor is connected with the first end of the second common-mode capacitor;
the second end of the second common mode capacitor is grounded;
a third input end of the first common mode inductor is connected with a first end of the first differential mode capacitor and receives a power supply voltage;
a third output end of the first common-mode inductor is connected with a first end of the third common-mode capacitor;
a second end of the third common mode capacitor is grounded;
and the second end of the first differential mode capacitor is respectively connected with the second end of the second differential mode capacitor and the second end of the third differential mode capacitor.
In a specific embodiment, the second filtering unit includes:
the second common-mode inductor, the fourth differential-mode capacitor, the fifth differential-mode capacitor, the sixth differential-mode capacitor, the fourth common-mode capacitor, the fifth common-mode capacitor and the sixth common-mode capacitor;
wherein,
a first input end of the second common-mode inductor is connected with a first end of the sixth differential-mode capacitor and a first output end of the first common-mode inductor respectively;
a first output end of the second common-mode inductor is connected with a first end of the fourth common-mode capacitor;
a second end of the fourth common mode capacitor is grounded;
a second input end of the second common-mode inductor is connected with a first end of the fifth differential-mode capacitor and a second output end of the first common-mode inductor respectively;
a second output end of the second common-mode inductor is connected with a first end of the fifth common-mode capacitor;
a second end of the fifth common mode capacitor is grounded;
a third input end of the second common mode inductor is connected with a first end of the fourth differential mode capacitor and a third output end of the first common mode inductor respectively;
a third output end of the second common-mode inductor is connected with a first end of the sixth common-mode capacitor;
a second end of the sixth common mode capacitor is grounded;
and the second end of the fourth differential mode capacitor is respectively connected with the second end of the fifth differential mode capacitor and the second end of the sixth differential mode capacitor.
In a specific embodiment, the third filtering unit includes:
a first differential mode inductor, a seventh differential mode capacitor, an eighth differential mode capacitor and a ninth differential mode capacitor;
wherein,
a first input end of the first differential-mode inductor is connected with a first output end of the second common-mode inductor and a first end of the ninth differential-mode capacitor respectively;
a second input end of the first differential mode inductor is respectively connected with a second output end of the second common mode inductor and a first end of the eighth differential mode capacitor;
a third input end of the first differential-mode inductor is respectively connected with a third output end of the second common-mode inductor and a first end of the seventh differential-mode capacitor;
a second end of the seventh differential mode capacitor is connected with a second end of the eighth differential mode capacitor and a second end of the ninth differential mode capacitor respectively;
and a first output end, a second output end and a third output end of the first differential-mode inductor are used as output ends of the power supply filter.
In a specific embodiment, the inductance of the first common mode inductor is 40 mH;
the capacitance values of the first differential mode capacitor, the second differential mode capacitor and the third differential mode capacitor are all 4.7 uF;
and the capacitance values of the first common-mode capacitor, the second common-mode capacitor and the third common-mode capacitor are all 0.01 uF.
In a specific embodiment, the inductance of the second common mode inductor is 30 mH;
the capacitance values of the fourth differential mode capacitor, the fifth differential mode capacitor and the sixth differential mode capacitor are all 2.2 uF;
and the capacitance values of the fourth common-mode capacitor, the fifth common-mode capacitor and the sixth common-mode capacitor are all 0.01 uF.
In a specific embodiment, the inductance of the first differential-mode inductor is 50 uH;
and the capacitance values of the seventh differential mode capacitor, the eighth differential mode capacitor and the ninth differential mode capacitor are 1 uF.
The invention has the following beneficial effects:
the power filter for the PWM power amplifying circuit provided by the invention reduces conducted interference of the PWM power amplifying circuit to the power input end to meet the standard of the national military standard CE102, reduces conducted interference among devices using the same power supply, and enhances the electromagnetic compatibility of the whole PWM power amplifying circuit system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are one embodiment of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 shows a circuit diagram of a power supply filter for a PWM power amplifying circuit according to an embodiment of the present invention.
Fig. 2 shows a circuit diagram of a first filtering unit in a power filter for a PWM power amplifying circuit according to an embodiment of the present invention.
Fig. 3 shows a circuit diagram of a second filtering unit in a power filter for a PWM power amplifying circuit according to an embodiment of the present invention.
Fig. 4 shows a circuit diagram of a third filtering unit in a power filter for a PWM power amplifying circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. The present invention will be described in detail with reference to specific examples, but the present invention is not limited to these examples. Variations and modifications may be made by those skilled in the art without departing from the principles of the invention and should be considered within the scope of the invention.
In this embodiment, a test analysis is performed on an actual product, specific characteristics and magnitude of interference of the PWM power amplification circuit with respect to an input power supply are defined, and a power filter for the PWM power amplification circuit is provided in a targeted manner, as shown in fig. 1, the power filter includes:
the device comprises a first filtering unit, a second filtering unit and a third filtering unit;
wherein,
a first input end 1, a second input end 3 and a third input end 5 of the first filtering unit are used as input ends of the power supply filter to receive power supply voltage;
the first to third output ends of the first filtering unit are respectively connected with the first to third input ends of the second filtering unit;
the first to third output ends of the second filtering unit are respectively connected with the first to third input ends of the third filtering unit;
the first output end 2, the second output end 4 and the third output end 6 of the third filtering unit are used as the output ends of the power supply filter.
As shown in fig. 2, the first filtering unit includes:
the capacitive load driving circuit comprises a first common-mode inductor Ly1, a first differential-mode capacitor Cx1, a second differential-mode capacitor Cx2, a third differential-mode capacitor Cx3, a first common-mode capacitor Cy1, a second common-mode capacitor Cy2 and a third common-mode capacitor Cy 3;
the area enclosed by the dashed line in fig. 2 is the first common mode inductor Ly 1.
Wherein,
a first input end of the first common mode inductor (i.e. the first input end 1 of the first filtering unit) is connected to a first end of the third differential mode capacitor and receives a supply voltage;
a first output end of the first common-mode inductor (i.e. a first output end of the first filtering unit) is connected to a first end of the first common-mode capacitor;
the second end of the first common-mode capacitor is grounded;
a second input end of the first common mode inductor (i.e. the second input end 3 of the first filtering unit) is connected to a first end of the second differential mode capacitor and receives a power supply voltage;
a second output end of the first common-mode inductor (i.e. a second output end of the first filtering unit) is connected to a first end of the second common-mode capacitor;
the second end of the second common mode capacitor is grounded;
a third input end of the first common mode inductor (i.e. the third input end 5 of the first filtering unit) is connected to the first end of the first differential mode capacitor and receives a supply voltage;
a third output end of the first common-mode inductor (i.e. a third output end of the first filtering unit) is connected to the first end of the third common-mode capacitor;
a second end of the third common mode capacitor is grounded;
and the second end of the first differential mode capacitor is respectively connected with the second end of the second differential mode capacitor and the second end of the third differential mode capacitor.
As shown in fig. 3, the second filter unit circuit is the same as the first filter unit circuit and includes:
a second common-mode inductor Ly2, a fourth differential-mode capacitor Cx4, a fifth differential-mode capacitor Cx5, a sixth differential-mode capacitor Cx6, a fourth common-mode capacitor Cy4, a fifth common-mode capacitor Cy5 and a sixth common-mode capacitor Cy 6;
the area enclosed by the dashed line in fig. 3 is the second common mode inductor Ly 2.
Wherein,
a first input end of the second common mode inductor (i.e., a first input end of the second filtering unit) is respectively connected to a first end of the sixth differential mode capacitor and a first output end of the first common mode inductor;
a first output end of the second common-mode inductor (i.e. a first output end of the second filtering unit) is connected to a first end of the fourth common-mode capacitor;
a second end of the fourth common mode capacitor is grounded;
a second input end of the second common mode inductor (i.e., a second input end of the second filtering unit) is respectively connected to a first end of the fifth differential mode capacitor and a second output end of the first common mode inductor;
a second output end of the second common-mode inductor (i.e., a second output end of the second filtering unit) is connected to the first end of the fifth common-mode capacitor;
a second end of the fifth common mode capacitor is grounded;
a third input end of the second common mode inductor (i.e., a third input end of the second filtering unit) is respectively connected to the first end of the fourth differential mode capacitor and the third output end of the first common mode inductor;
a third output end of the second common-mode inductor (i.e., a third output end of the second filtering unit) is connected to the first end of the sixth common-mode capacitor;
a second end of the sixth common mode capacitor is grounded;
and the second end of the fourth differential mode capacitor is respectively connected with the second end of the fifth differential mode capacitor and the second end of the sixth differential mode capacitor.
As shown in fig. 4, the third filtering unit includes:
a first differential mode inductance Lx1, a seventh differential mode capacitance Cx7, an eighth differential mode capacitance Cx8, and a ninth differential mode capacitance Cx 9;
the area enclosed by the dashed line in fig. 4 is the first differential-mode inductor Lx 1.
Wherein,
a first input end of the first differential-mode inductor (i.e., a first input end of the third filtering unit) is respectively connected to a first output end of the second common-mode inductor and a first end of the ninth differential-mode capacitor;
a second input end of the first differential-mode inductor (i.e., a second input end of the third filtering unit) is respectively connected to a second output end of the second common-mode inductor and a first end of the eighth differential-mode capacitor;
a third input end of the first differential-mode inductor (i.e., a third input end of the third filtering unit) is respectively connected to a third output end of the second common-mode inductor and a first end of the seventh differential-mode capacitor;
a second end of the seventh differential mode capacitor is connected with a second end of the eighth differential mode capacitor and a second end of the ninth differential mode capacitor respectively;
a first output end (i.e., the first output end 2 of the third filtering unit), a second output end (i.e., the second output end 4 of the third filtering unit), and a third output end (i.e., the third output end 6 of the third filtering unit) of the first differential-mode inductor are used as output ends of the power filter.
The test method used for analyzing the characteristics of the input power source end of the PWM power amplifying circuit is a test method of CE 10210 kHz-10MHz power source line conduction emission specified in GJB 151A.
In a specific embodiment, the first filtering unit parameter of the power filter is set as:
the inductance of the first common-mode inductor is 40 mH;
the capacitance values of the first differential mode capacitor, the second differential mode capacitor and the third differential mode capacitor are all 4.7 uF;
and the capacitance values of the first common-mode capacitor, the second common-mode capacitor and the third common-mode capacitor are all 0.01 uF.
The inductance of the second common-mode inductor is 30 mH;
the capacitance values of the fourth differential mode capacitor, the fifth differential mode capacitor and the sixth differential mode capacitor are all 2.2 uF;
and the capacitance values of the fourth common-mode capacitor, the fifth common-mode capacitor and the sixth common-mode capacitor are all 0.01 uF.
The interference voltage of a load on a power supply input end is measured by using a spectrum analyzer, two filtering units are connected in series and are arranged at an input power supply end of a PWM power amplifying circuit, when the filter is not used, the low-frequency stage is 10kHz-250kHz, the amplitude of CE102 is reduced by 30dB, the suppression effect of the filter is obvious, but at 250kHz-10MHz, the CE102 exceeds a set threshold value, and therefore the third filtering unit is added;
the inductance of the first differential-mode inductor is 50 uH;
and the capacitance values of the seventh differential mode capacitor, the eighth differential mode capacitor and the ninth differential mode capacitor are 1 uF.
After the third filtering unit is added, the amplitude of the CE102 is reduced by 10dB at 250kHz-10MHz, so that the power filter formed by the structure form of serially connecting the three filtering units meets the requirement of conducted interference of the whole frequency band of the CE 102.
The power filter for the PWM power amplifying circuit provided by the embodiment applies a multi-stage composite filter topological structure, has a good inhibiting effect on power line reverse conducted interference brought by dv/dt and loop di/dt generated by PWM power amplifying pulse voltage at a 10k-10MHz stage, enables the power amplifying circuit to pass a national military standard CE102 test, reduces conducted interference among devices using the same power supply, and enhances the electromagnetic compatibility of the whole PWM power amplifying circuit system.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (7)
1. A power supply filter for a PWM power amplification circuit, the power supply filter comprising:
the device comprises a first filtering unit, a second filtering unit and a third filtering unit;
wherein,
first to third input terminals of the first filtering unit receive a power supply voltage;
the first to third output ends of the first filtering unit are respectively connected with the first to third input ends of the second filtering unit;
the first to third output ends of the second filtering unit are respectively connected with the first to third input ends of the third filtering unit;
the first to third output terminals of the third filtering unit serve as output terminals of the power supply filter.
2. The power filter of claim 1, wherein the first filtering unit comprises:
the circuit comprises a first common-mode inductor, a first differential-mode capacitor, a second differential-mode capacitor, a third differential-mode capacitor, a first common-mode capacitor, a second common-mode capacitor and a third common-mode capacitor;
wherein,
a first input end of the first common mode inductor is connected with a first end of the third differential mode capacitor and receives a power supply voltage;
a first output end of the first common mode inductor is connected with a first end of the first common mode capacitor;
the second end of the first common-mode capacitor is grounded;
the second input end of the first common mode inductor is connected with the first end of the second differential mode capacitor and receives a power supply voltage;
the second output end of the first common-mode inductor is connected with the first end of the second common-mode capacitor;
the second end of the second common mode capacitor is grounded;
a third input end of the first common mode inductor is connected with a first end of the first differential mode capacitor and receives a power supply voltage;
a third output end of the first common-mode inductor is connected with a first end of the third common-mode capacitor;
a second end of the third common mode capacitor is grounded;
and the second end of the first differential mode capacitor is respectively connected with the second end of the second differential mode capacitor and the second end of the third differential mode capacitor.
3. The power filter of claim 2, wherein the second filtering unit comprises:
the second common-mode inductor, the fourth differential-mode capacitor, the fifth differential-mode capacitor, the sixth differential-mode capacitor, the fourth common-mode capacitor, the fifth common-mode capacitor and the sixth common-mode capacitor;
wherein,
a first input end of the second common-mode inductor is connected with a first end of the sixth differential-mode capacitor and a first output end of the first common-mode inductor respectively;
a first output end of the second common-mode inductor is connected with a first end of the fourth common-mode capacitor;
a second end of the fourth common mode capacitor is grounded;
a second input end of the second common-mode inductor is connected with a first end of the fifth differential-mode capacitor and a second output end of the first common-mode inductor respectively;
a second output end of the second common-mode inductor is connected with a first end of the fifth common-mode capacitor;
a second end of the fifth common mode capacitor is grounded;
a third input end of the second common mode inductor is connected with a first end of the fourth differential mode capacitor and a third output end of the first common mode inductor respectively;
a third output end of the second common-mode inductor is connected with a first end of the sixth common-mode capacitor;
a second end of the sixth common mode capacitor is grounded;
and the second end of the fourth differential mode capacitor is respectively connected with the second end of the fifth differential mode capacitor and the second end of the sixth differential mode capacitor.
4. The power filter of claim 3, wherein the third filtering unit comprises:
a first differential mode inductor, a seventh differential mode capacitor, an eighth differential mode capacitor and a ninth differential mode capacitor;
wherein,
a first input end of the first differential-mode inductor is connected with a first output end of the second common-mode inductor and a first end of the ninth differential-mode capacitor respectively;
a second input end of the first differential mode inductor is respectively connected with a second output end of the second common mode inductor and a first end of the eighth differential mode capacitor;
a third input end of the first differential-mode inductor is respectively connected with a third output end of the second common-mode inductor and a first end of the seventh differential-mode capacitor;
a second end of the seventh differential mode capacitor is connected with a second end of the eighth differential mode capacitor and a second end of the ninth differential mode capacitor respectively;
and a first output end, a second output end and a third output end of the first differential-mode inductor are used as output ends of the power supply filter.
5. The power filter of claim 4, wherein the inductance of the first common-mode inductor is 40 mH;
the capacitance values of the first differential mode capacitor, the second differential mode capacitor and the third differential mode capacitor are all 4.7 uF;
and the capacitance values of the first common-mode capacitor, the second common-mode capacitor and the third common-mode capacitor are all 0.01 uF.
6. The power filter of claim 5, wherein the inductance of the second common-mode inductor is 30 mH;
the capacitance values of the fourth differential mode capacitor, the fifth differential mode capacitor and the sixth differential mode capacitor are all 2.2 uF;
and the capacitance values of the fourth common-mode capacitor, the fifth common-mode capacitor and the sixth common-mode capacitor are all 0.01 uF.
7. The power filter of claim 6, wherein the inductance of the first differential-mode inductor is 50 uH;
and the capacitance values of the seventh differential mode capacitor, the eighth differential mode capacitor and the ninth differential mode capacitor are 1 uF.
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Application publication date: 20211123 |