CN-224233548-U - LED RGB power supply switching port filtering protection circuit of vehicle projector

CN224233548UCN 224233548 UCN224233548 UCN 224233548UCN-224233548-U

Abstract

The utility model relates to a vehicle-mounted projector LED RGB power supply switching port filtering protection circuit which comprises an R lamp filtering protection circuit connected with an R lamp interface, a G lamp filtering protection circuit connected with a G lamp interface and a B lamp filtering protection circuit connected with a B lamp interface, wherein the R lamp filtering protection circuit, the G lamp filtering protection circuit and the B lamp filtering protection circuit comprise plug-in common mode inductors, BDL filters and TVS tubes which are sequentially arranged in parallel, the plug-in common mode inductors are used for providing common mode noise suppression capability, the BDL filters are used for providing common mode filtering capability and better low-frequency differential mode noise filtering capability, the TVS tubes are used for providing surge plugging impact prevention capability, the integrated differential mode noise suppression filtering and surge protection capability is not easy to influence, and the capability of suppressing the EMI intensity is also obvious, so that the EMI noise radiation can be effectively suppressed.

Inventors

HUANG ZHAO
LI WEITAO
GUO YUXIN
FANG XINJIE

Assignees

深圳市韬略科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250430

Claims (7)

1. The LED RGB power supply switching port filtering protection circuit of the vehicle-mounted projector is characterized by comprising an R lamp filtering protection circuit connected with an R lamp interface, a G lamp filtering protection circuit connected with a G lamp interface and a B lamp filtering protection circuit connected with a B lamp interface, wherein the R lamp filtering protection circuit, the G lamp filtering protection circuit and the B lamp filtering protection circuit all comprise plug-in common mode inductors, BDL filters and TVS tubes which are sequentially connected in parallel.
2. The LED RGB power supply switching port filtering protection circuit of the vehicle-mounted projector is characterized by comprising a first plug-in common mode inductor, a first BDL filter and a first TVS tube, wherein a first end of the first plug-in common mode inductor, an A pole of the first BDL filter and a negative pole of the first TVS tube are respectively connected with an anode of an R lamp interface, and a second end of the first plug-in common mode inductor, a B pole of the first BDL filter and an anode of the first TVS tube are respectively connected with a cathode of the R lamp interface.
3. The LED RGB power supply switching port filter protection circuit of the vehicle-mounted projector according to claim 2, wherein the first end of the first plug-in common mode inductor is communicated with the third end of the first plug-in common mode inductor, the third end of the first plug-in common mode inductor is connected to a power supply end, the second end of the first plug-in common mode inductor is communicated with the fourth end of the first plug-in common mode inductor, and the fourth end of the first plug-in common mode inductor is grounded.
4. The LED RGB power supply switching port filtering protection circuit of the vehicle-mounted projector is characterized by comprising a second plug-in common mode inductor, a second BDL filter and a second TVS tube, wherein the first end of the second plug-in common mode inductor, the A pole of the second BDL filter and the negative pole of the second TVS tube are respectively connected with the positive pole of a G lamp interface, and the second end of the second plug-in common mode inductor, the B pole of the second BDL filter and the positive pole of the second TVS tube are respectively connected with the negative pole of the G lamp interface.
5. The LED RGB power supply switching port filter protection circuit of the vehicle-mounted projector according to claim 4, wherein the first end of the second plug-in common mode inductor is communicated with the third end of the second plug-in common mode inductor, the third end of the second plug-in common mode inductor is connected to a power supply end, the second end of the second plug-in common mode inductor is communicated with the fourth end of the second plug-in common mode inductor, and the fourth end of the second plug-in common mode inductor is grounded.
6. The LED RGB power supply switching port filtering protection circuit of the vehicle-mounted projector is characterized by comprising a third plug-in common mode inductor, a third BDL filter and a third TVS tube, wherein the first end of the third plug-in common mode inductor, the A pole of the third BDL filter and the negative pole of the third TVS tube are respectively connected with the positive pole of a B lamp interface, and the second end of the third plug-in common mode inductor, the B pole of the third BDL filter and the positive pole of the third TVS tube are respectively connected with the negative pole of the B lamp interface.
7. The LED RGB power supply switching port filter protection circuit of the vehicle-mounted projector according to claim 6, wherein the first end of the third plug-in common mode inductor is communicated with the third end of the third plug-in common mode inductor, the third end of the third plug-in common mode inductor is connected to a power supply end, the second end of the third plug-in common mode inductor is communicated with the fourth end of the third plug-in common mode inductor, and the fourth end of the third plug-in common mode inductor is grounded.

Description

LED RGB power supply switching port filtering protection circuit of vehicle projector Technical Field The utility model relates to the technical field of electromagnetic compatibility of vehicle-mounted equipment, in particular to a filtering protection circuit for an LED RGB power supply switching port of a vehicle-mounted projector. Background With the rapid development of the new energy automobile industry, related vehicle-mounted products are increasingly diversified, for example, a vehicle-mounted projector is one of the emerging vehicle-mounted products. At present, in the EMI problem treatment of each module of the vehicle-mounted projector, the EMI noise problem of the driving power supply is found to be mainly existed when the power supply of the LED RGB light source is switched. The reason is that the running current of the vehicle projector is large, when the MOS tube is on/off in the power supply switching process of the LED RGB light source, the dithering large current can radiate noise outwards through the external wiring harness of the light source, therefore, the emission intensity of the EMI is strong, the noise suppression difficulty is high, and the treatment measures for suppressing the EMI are required to be higher. The existing method for processing the EMI problem during the power supply switching of the LED RGB light source still has the defects that because the current of the LED RGB light source is large, a plurality of filtering means cannot be used, for example, the magnetic beads for the traditional circuit are used for suppressing noise, but because the current limit can cause the impedance selection of the magnetic beads to be lower, the noise suppression effect is basically not generated, the capability of suppressing the EMI intensity is not obvious enough, and thus the EMI noise cannot be effectively suppressed. Disclosure of utility model The utility model aims to solve the technical problem of providing a filtering protection circuit for an LED RGB power supply switching port of a vehicle-mounted projector aiming at the defects in the prior art. The technical scheme includes that the filtering protection circuit comprises an R lamp filtering protection circuit connected with an R lamp interface, a G lamp filtering protection circuit connected with a G lamp interface and a B lamp filtering protection circuit connected with a B lamp interface, wherein the R lamp filtering protection circuit, the G lamp filtering protection circuit and the B lamp filtering protection circuit comprise plug-in common mode inductors, BDL filters and TVS tubes which are sequentially connected in parallel. In some embodiments, the R lamp filtering protection circuit comprises a first plug-in common mode inductor, a first BDL filter and a first TVS tube, wherein the first end of the first plug-in common mode inductor, the A pole of the first BDL filter and the negative pole of the first TVS tube are respectively connected with the positive pole of the R lamp interface, and the second end of the first plug-in common mode inductor, the B pole of the first BDL filter and the positive pole of the first TVS tube are respectively connected with the negative pole of the R lamp interface. In some embodiments, the first end of the first plug-in common-mode inductor is communicated with the third end of the first plug-in common-mode inductor, the third end of the first plug-in common-mode inductor is connected to the power supply end, the second end of the first plug-in common-mode inductor is communicated with the fourth end of the first plug-in common-mode inductor, and the fourth end of the first plug-in common-mode inductor is grounded. In some embodiments, the G lamp filtering protection circuit comprises a second plug-in common mode inductor, a second BDL filter and a second TVS tube, wherein the first end of the second plug-in common mode inductor, the A pole of the second BDL filter and the negative pole of the second TVS tube are respectively connected with the positive pole of the G lamp interface, and the second end of the second plug-in common mode inductor, the B pole of the second BDL filter and the positive pole of the second TVS tube are respectively connected with the negative pole of the G lamp interface. In some embodiments, the first end of the second plug-in common-mode inductor is communicated with the third end of the second plug-in common-mode inductor, the third end of the second plug-in common-mode inductor is connected to the power supply end, the second end of the second plug-in common-mode inductor is communicated with the fourth end of the second plug-in common-mode inductor, and the fourth end of the second plug-in common-mode inductor is grounded. In some embodiments, the B lamp filtering protection circuit comprises a third plug-in common mode inductor, a third BDL filter and a third TVS tube, wherein the first end of the third plug-in common mode inductor, the A pole of the