Military AC / DC low-radiation EMC power adapter
By designing AC filter circuits, AC/DC modules, DC filter circuits, and output filter circuits, and combining two-stage filter circuits and EMI filter circuits, the electromagnetic interference problem of the power adapter was solved, achieving better electromagnetic compatibility performance and anti-interference capability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-27
AI Technical Summary
Existing power adapters lack electromagnetic compatibility performance, resulting in serious electromagnetic interference problems.
It adopts a structural design that includes an AC filter circuit, an AC/DC module, a DC filter circuit, and an output filter circuit, and combines a two-stage filter circuit and an EMI filter circuit to enhance anti-interference capability.
It effectively suppresses electromagnetic interference, improves the electromagnetic compatibility performance of the power adapter, enhances anti-interference capabilities, and expands the scope of application.
Smart Images
Figure CN224054119U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to charging technical field, concretely is a kind of military ac-dc low radiation EMC power adapter. BACKGROUND
[0002] Power adapter (Power adapter) is the power supply conversion equipment of small portable electronic equipment and electronic appliance, generally by shell, transformer, inductance, capacitor, control IC, PCB board and other components, EMC is full name:Electromagnetic Compatibility, i.e.
[0003] The existing power adapter does not have good electromagnetic compatibility, to solve the electromagnetic interference problem of power adapter, must take measures from the generation and reception of electromagnetic wave two aspects, inhibit the conducted interference and radiation interference of power adapter, enhance the anti-interference ability of electronic equipment or electronic system, for this, a kind of military ac-dc low radiation EMC power adapter with good electromagnetic compatibility is proposed. UTILITY MODEL CONTENT
[0004] (I) the technical problem solved
[0005] In view of the deficiencies of prior art, the utility model provides a kind of military ac-dc low radiation EMC power adapter, solves the electromagnetic interference problem of the existing power adapter.
[0006] (II) technical scheme
[0007] To achieve the above object, the utility model is realized by the following technical scheme: a kind of military ac-dc low radiation EMC power adapter, including ac filtering circuit, AC / DC module, direct current filter circuit, DC / DC module and output filter circuit.
[0008] The input end of the ac filtering circuit inputs alternating current, and the output end of the ac filtering circuit is electrically connected with the input end of AC / DC module.
[0009] The input end of the direct current filter circuit inputs direct current, and the output end of the direct current filter circuit is electrically connected with the input end of DC / DC module.
[0010] The output end of the AC / DC module and the output end of DC / DC module are respectively electrically connected with the input end of output filter circuit, and the output end of output filter circuit outputs direct current.
[0011] Preferably, the AC filter circuit comprises a first-stage AC filter circuit and a second-stage AC filter circuit, the first-stage AC filter circuit comprises a common-mode inductor L1, a resistor R1, a ceramic capacitor CX1, a ceramic capacitor CX2, a safety capacitor CY1, a safety capacitor CY2, a safety capacitor CY3 and a safety capacitor CY4, the second-stage AC filter circuit comprises a common-mode inductor L2, a safety capacitor CY5 and a safety capacitor CY6, wherein:
[0012] The common-mode inductor L1 input end is connected to AC power, the common-mode inductor L1 output end is electrically connected to the common-mode inductor L2 input end, and the common-mode inductor L2 output end is electrically connected to the AC / DC module input end.
[0013] The resistor R1 and the ceramic capacitor CX1 are both connected in parallel to the common-mode inductor L1 input end, the safety capacitor CY1 first end and the safety capacitor CY2 first end are both electrically connected to the common-mode inductor L1 input end, the ceramic capacitor CX2 is connected in parallel to the common-mode inductor L1 output end, and the safety capacitor CY3 first end and the safety capacitor CY4 first end are both electrically connected to the common-mode inductor L1 output end.
[0014] The safety capacitor CY5 first end and the safety capacitor CY6 first end are both electrically connected to the common-mode inductor L1 output end.
[0015] The safety capacitor CY1, the safety capacitor CY2, the safety capacitor CY3, the safety capacitor CY4, the safety capacitor CY5 and the safety capacitor CY6 are all electrically connected to the shell.
[0016] Preferably, the DC filter circuit comprises a first-stage DC filter circuit, a second-stage DC filter circuit and a reverse prevention circuit, the first-stage DC filter circuit comprises a common-mode inductor L6, a ceramic capacitor CX4, a ceramic capacitor CX5, a safety capacitor CY9 and a safety capacitor CY10, the second-stage DC filter circuit comprises a common-mode inductor L7 and a ceramic capacitor CX6, and the reverse prevention circuit comprises an electrolytic capacitor CX7 and a reverse prevention diode D1, wherein:
[0017] The common-mode inductor L6 input end is connected to DC power, the common-mode inductor L6 input end is connected in parallel to the ceramic capacitor CX4, the common-mode inductor L6 output end is connected in parallel to the ceramic capacitor CX5, the common-mode inductor L6 output end is connected in parallel to the safety capacitor CY9 first end and the safety capacitor CY10 first end, and the safety capacitor CY9 second end and the safety capacitor CY10 second end are electrically connected.
[0018] The common-mode inductor L7 output end is connected in parallel to the ceramic capacitor CX6.
[0019] The common mode inductor L7 output end is electrically connected with the anode of the anti-reverse diode D1, the cathode of the anti-reverse diode D1 and the anode of the electrolytic capacitor CX7 are electrically connected, and the cathode of the electrolytic capacitor CX7 and the other output end of the common mode inductor L7 are electrically connected.
[0020] The two ends of the electrolytic capacitor CX7 are electrically connected with the DC / DC module.
[0021] Preferably, the output filter circuit comprises a common mode inductor L4, a ceramic capacitor CX3, a safety capacitor CY7, a safety capacitor CY8, a safety capacitor CY9, a safety capacitor CY10 and a magnetic ring L5, wherein:
[0022] The AC / DC module and the DC / DC module output end are electrically connected with the input end of the common mode inductor L4, the ceramic capacitor CX3 is connected in parallel to the input end of the common mode inductor L4, the first end of the safety capacitor CY7 and the first end of the safety capacitor CY8 are electrically connected with the input end of the common mode inductor L4, and the first end of the safety capacitor CY9 and the first end of the safety capacitor CY10 are electrically connected with the output end of the common mode inductor L4.
[0023] The second end of the safety capacitor CY7, the second end of the safety capacitor CY8, the second end of the safety capacitor CY9 and the second end of the safety capacitor CY10 are electrically connected with the shell.
[0024] The output end of the common mode inductor L4 and the two ends of the magnetic ring L5 are electrically connected; and the output end of the common mode inductor L4 is arranged as a direct current output.
[0025] (Three) beneficial effects
[0026] The utility model provides a kind of military ac-dc low-emission EMC power adapter.It has the following beneficial effects:
[0027] 1, in the utility model, two-stage filter circuit is used to AC filter circuit and DC filter circuit, and two-stage filter circuit is EMI filter circuit, and low-voltage output end filter circuit also uses EMI filter circuit, which improves the anti-interference ability of the power adapter.
[0028] 2, in the utility model, input AC, DC two-in-one type two working conditions, two working conditions cannot be used simultaneously, which increases the application range of the power adapter. DRAWINGS
[0029] Fig. 1 It is the overall control structure schematic diagram of the utility model a kind of military ac-dc low-emission EMC power adapter;
[0030] Fig. 2 It is the AC filter circuit of a kind of military ac-dc low-emission EMC power adapter;
[0031] Fig. 3 The application discloses a DC filter circuit of a military AC / DC low-radiation EMC power adapter.
[0032] Fig. 4 The application discloses an output filter circuit of a military AC / DC low-radiation EMC power adapter.
[0033] Wherein, 1, AC filter circuit; 2, AC / DC module; 3, DC filter circuit; 4, DC / DC module; 5, output filter circuit. DETAILED DESCRIPTION
[0034] The technical solutions in the embodiments of the application will be apparently and completely described in connection with the drawings in the embodiments of the application. Apparently, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.
[0035] As shown in the figure, Figs. 1 to 4 According to the military AC / DC low-radiation EMC power adapter provided by the application, the AC filter circuit 1 inputs AC power, the output end of the AC filter circuit 1 is electrically connected with the input end of the AC / DC module 2; the DC filter circuit 3 inputs DC power, the output end of the DC filter circuit 3 is electrically connected with the input end of the DC / DC module 4; the output end of the AC / DC module 2 and the output end of the DC / DC module 4 are respectively electrically connected with the input end of the output filter circuit 5, and the output end of the output filter circuit 5 outputs DC power.
[0036] The AC filter circuit 1 forms an EMI filter, adopts two-stage filter circuits, i.e., a first-stage AC filter circuit and a second-stage AC filter circuit; the first-stage AC filter circuit comprises a common-mode inductor L1, a resistor R1, a ceramic capacitor CX1, a ceramic capacitor CX2, a safety capacitor CY1, a safety capacitor CY2, a safety capacitor CY3 and a safety capacitor CY4, and constitutes a first-stage type filter to inhibit; the second-stage AC filter circuit comprises a common-mode inductor L2, a safety capacitor CY5 and a safety capacitor CY6, and constitutes a second-stage type filter to inhibit; low-frequency and high-frequency noise are considered, and the efficiency of the EMI filter, i.e., the AC filter circuit 1, is improved.
[0037] The direct current filter circuit 3 comprises a first-stage direct current filter circuit, a second-stage direct current filter circuit and an anti-reverse circuit, and the direct current filter circuit 3 also forms an EMI filter, and two-stage filter circuits are adopted, the first-stage direct current filter circuit comprises a common-mode inductor L6, a ceramic capacitor CX4, a ceramic capacitor CX5, a safety capacitor CY9 and a safety capacitor CY10, and constitutes a first-stage type filter to inhibit, the second-stage direct current filter circuit comprises a common-mode inductor L7 and a ceramic capacitor CX6, and constitutes a second-stage type filter to inhibit, and the anti-reverse circuit comprises an electrolytic capacitor CX7 and an anti-reverse diode D1; the electrolytic capacitor CX7 arranged in the direct current filter circuit 3 increases the load capacity of the adapter; and the anti-reverse diode D1 arranged in the direct current filter circuit 3 prevents damage to the product when an alternating current channel is used.
[0038] The adapter can be used in two working states of inputting alternating current and direct current, and the two working states cannot be used simultaneously, so that the application range of the power adapter is increased.
[0039] The output filter circuit 5 comprises a common-mode inductor L4, a ceramic capacitor CX3, a safety capacitor CY7, a safety capacitor CY8, a safety capacitor CY9, a safety capacitor CY10 and a magnetic ring L5, and the output filter circuit 5 inhibits EMI interference of high-frequency common-mode noise; and the magnetic ring L5 is arranged close to the output end of the power adapter, and can prevent self-noise from being radiated out through the cable of the power adapter.
[0040] The two-stage filter circuits are adopted in the alternating current filter circuit 1 and the direct current filter circuit 3, and the two-stage filter circuits are EMI filter circuits, and the output filter circuit 5 also adopts an EMI filter circuit, so that the anti-interference capability of the power adapter is improved.
[0041] The shell of the military alternating current and direct current low-radiation EMC power adapter is designed as follows: the contact depth between the upper cover and the lower cover of the shell of the power adapter is large, and the purpose is to increase reflection loss and avoid leakage of high-frequency noise from the gap between the upper cover and the lower cover.
[0042] The shell contact surface process is as follows: the contact surface between the upper cover and the lower cover of the shell of the power adapter is ensured to be well conductive, and the shell of the power adapter requires depainting and paint removal and uses electrolytic solution for electroplating.
[0043] The non-conductive impurities on the screw thread of the power adapter are removed to ensure that the screw is well conductive.
[0044] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A military AC / DC low-radiation EMC power adapter, characterized in that: The AC filter circuit (1), the AC / DC module (2), the DC filter circuit (3), the DC / DC module (4) and the output filter circuit (5) are connected in series. The AC filter circuit (1) is connected to the input end of the AC / DC module (2). The DC filter circuit (3) is connected to the input end of the DC / DC module (4). The output ends of the AC / DC module (2) and the DC / DC module (4) are connected to the input end of the output filter circuit (5).
2. The military AC / DC low-radiation EMC power adapter of claim 1, wherein: The AC filter circuit (1) includes a first-stage AC filter circuit and a second-stage AC filter circuit. The first-stage AC filter circuit includes a common-mode inductor L1, a resistor R1, a ceramic capacitor CX1, a ceramic capacitor CX2, an safety capacitor CY1, an safety capacitor CY2, an safety capacitor CY3 and an safety capacitor CY4. The common-mode inductor L1 is connected to the input end of the AC / DC module (2). The resistor R1 and the ceramic capacitor CX1 are connected in parallel to the input end of the common-mode inductor L1. The safety capacitor CY1 and the safety capacitor CY2 are connected in parallel to the input end of the common-mode inductor L1.
3. The military AC / DC low-radiation EMC power adapter of claim 2, wherein: The ceramic capacitor CX2 is connected in parallel to the output end of the common-mode inductor L1. The safety capacitor CY3 and the safety capacitor CY4 are connected in parallel to the output end of the common-mode inductor L1. The safety capacitor CY1, the safety capacitor CY2, the safety capacitor CY3, the safety capacitor CY4, the safety capacitor CY5 and the safety capacitor CY6 are connected to the shell. The DC filter circuit (3) includes a first-stage DC filter circuit, a second-stage DC filter circuit and a reverse prevention circuit. The first-stage DC filter circuit includes a common-mode inductor L6, a ceramic capacitor CX4, a ceramic capacitor CX5, an safety capacitor CY9 and an safety capacitor CY10. The second-stage DC filter circuit includes a common-mode inductor L7 and a ceramic capacitor CX6. The reverse prevention circuit includes an electrolytic capacitor CX7 and a reverse prevention diode D1. The common-mode inductor L6 is connected to the input end of the DC / DC module (4). The common-mode inductor L7 is connected to the output end of the DC / DC module (4). The ceramic capacitor CX6 is connected in parallel to the output end of the common-mode inductor L7. The common mode inductor L7 output end is electrically connected with the anode of the anti-reverse diode D1, the cathode of the anti-reverse diode D1 and the anode of the electrolytic capacitor CX7 are electrically connected, the cathode of the electrolytic capacitor CX7 and the other output end of the common mode inductor L7 are electrically connected; The two ends of the electrolytic capacitor CX7 are respectively electrically connected with the DC / DC module (4).
4. The military AC / DC low-radiation EMC power adapter of claim 3, wherein: The output filter circuit (5) comprises a common mode inductor L4, a ceramic capacitor CX3, a safety capacitor CY7, a safety capacitor CY8, a safety capacitor CY9, a safety capacitor CY10 and a magnetic ring L5, wherein: The output ends of the AC / DC module (2) and the DC / DC module (4) are electrically connected with the input end of the common mode inductor L4, the ceramic capacitor CX3 is connected in parallel to the input end of the common mode inductor L4, the first ends of the safety capacitor CY7 and the safety capacitor CY8 are respectively electrically connected with the input end of the common mode inductor L4, the first ends of the safety capacitor CY9 and the safety capacitor CY10 are respectively electrically connected with the output end of the common mode inductor L4; The second ends of the safety capacitor CY7, the safety capacitor CY8, the safety capacitor CY9 and the safety capacitor CY10 are electrically connected with the shell; The output end of the common mode inductor L4 and the two ends of the magnetic ring L5 are electrically connected; the output end of the common mode inductor L4 is set as a direct current output.