A composite film capacitor

Abstract

This utility model relates to the field of capacitor technology, specifically to a combined thin-film capacitor that can improve capacitor reliability. It includes a housing, within which capacitor cores are disposed. The capacitor cores are arranged side-by-side at intervals. The positive electrodes of the two capacitor cores are arranged facing each other and are respectively connected to positive electrode leads. The positive electrode leads are connected to an upper electrode plate, which has two positive electrode leads. The negative electrodes of the two capacitor cores are respectively connected to the two ends of a negative electrode lead, which has two negative electrode leads. An insulating pad is disposed between the upper electrode plate and the negative electrode lead.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, specifically a combined thin-film capacitor. Background Technology

[0002] Existing capacitors are generally individually packaged. When the internal capacitor core fails, the entire capacitor will fail, thus affecting the normal operation of the overall circuit. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a combined thin-film capacitor that can improve capacitor reliability.

[0004] The technical solution is as follows: A combined thin-film capacitor includes a housing, and a capacitor core is disposed inside the housing. The capacitor core is characterized by having two capacitor cores arranged side-by-side at intervals. The positive electrodes of the two capacitor cores are arranged facing each other and are respectively connected to positive electrode leads. The positive electrode leads are connected to an upper electrode plate, and the upper electrode plate is provided with two positive electrode leads. The negative electrodes of the two capacitor cores are respectively connected to the two ends of a negative electrode lead plate, and the negative electrode lead plate is provided with two negative electrode leads. An insulating pad is disposed between the upper electrode plate and the negative electrode lead plate.

[0005] A further feature is that the top of the outer casing is open, and the inner wall of the outer casing is provided with inner reinforcing ribs;

[0006] The bottom of the outer wall of the outer shell is provided with mounting ears, and the mounting ears are provided with mounting holes and external reinforcing ribs;

[0007] The inner reinforcing rib is provided with a positioning piece, and the positioning piece has a notch for potting material. Both the positive electrode and the negative electrode lead-out electrode pass through the positioning piece.

[0008] A sealing plate is provided above the positioning piece.

[0009] With this invention, two capacitors are connected in parallel inside the casing, and when one capacitor fails due to a short circuit, the other capacitor can work normally, ensuring that the circuit can operate normally in the short term and improving the reliability of the capacitor. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 for Figure 1 A schematic diagram of the structure without the sealing plate;

[0012] Figure 3 This is the circuit schematic diagram of this utility model;

[0013] Figure 4 This is a schematic diagram of the outer shell structure;

[0014] Figure 5 A schematic diagram of the structure of two capacitor cores;

[0015] Figure 6 This is a schematic diagram showing the connection between the capacitor core and the electrodes;

[0016] Figure 7 for Figure 6 Schematic diagram of the positioning plate structure. Detailed Implementation

[0017] See Figures 1 to 7 As shown, a combined film capacitor includes a housing 1, inside which are two capacitor cores 2 arranged side by side at intervals, employing a stacked structure to effectively reduce capacitor self-inductance while increasing capacitor overcurrent capability. The positive terminals of the two capacitor cores 2 are arranged facing each other and are respectively connected to positive lead plates 3. The positive lead plates 3 are connected to upper electrode plates 4, and the upper electrode plates 4 are provided with two positive lead electrodes 5. The negative terminals of the two capacitor cores 2 are respectively connected to the two ends of negative lead plates 6, and the negative lead plates 6 are provided with two negative lead electrodes 7. An isolation pad 8 is provided between the upper electrode plates 4 and the negative lead plates 6, forming two parallel capacitors.

[0018] The outer shell 1 is made of PPS or other plastics with a temperature resistance of ≥125℃. The top of the outer shell 1 is open, and the inner wall of the outer shell 1 is provided with inner reinforcing ribs 9, which not only increases the strength of the outer shell, but also leaves space for potting material, so that the potting material can wrap the capacitor core 2.

[0019] The bottom of the outer wall of the outer shell 1 is provided with a mounting ear 10. The mounting ear 10 is provided with a mounting hole 11 and an outer reinforcing rib 12, which also ensures the strength of the outer shell 1.

[0020] A positioning piece 13 is provided on the inner reinforcing rib 12. The positioning piece 13 has a potting material notch 14. The positive electrode 5 and the negative electrode 7 both pass through the positioning piece 13. In actual production, the positioning piece 13 is a plastic sheet. When the positioning piece 13 is injection molded, the electrode is placed in the injection mold and injection molded into the positioning piece 13. This can ensure the flatness of the electrode and the consistency of the lead-out size. Then the electrode is connected to the upper electrode piece 4 and the negative electrode lead-out piece 6. The potting material can flow in from the potting material notch 14, and at the same time, the potting material is firmly bonded to the positioning piece 13.

[0021] After the positioning plate 13 is installed, a sealing plate 15 is installed on top of it.

Claims

1. A combined film capacitor, comprising a housing, wherein a capacitor core is disposed within the housing, characterized in that, Two capacitor cores are arranged side by side at intervals. The positive terminals of the two capacitor cores are arranged facing each other and are respectively connected to positive lead plates. The positive lead plates are connected to the upper electrode plate, which has two positive lead electrodes. The negative terminals of the two capacitor cores are respectively connected to the two ends of the negative lead plate, which has two negative lead electrodes. An isolation pad is provided between the upper electrode plate and the negative lead plate.

2. A combined thin-film capacitor according to claim 1, characterized in that, The outer casing has an opening at the top, and the inner wall of the outer casing is provided with internal reinforcing ribs.

3. A combined thin-film capacitor according to claim 1, characterized in that, The bottom of the outer wall of the outer shell is provided with mounting ears, which are provided with mounting holes and external reinforcing ribs.

4. A combined thin-film capacitor according to claim 1, characterized in that, The inner reinforcing rib is provided with a positioning piece, and the positioning piece has a notch for potting material. Both the positive electrode and the negative electrode lead-out electrode pass through the positioning piece.

5. A combined thin-film capacitor according to claim 4, characterized in that, A sealing plate is provided above the positioning piece.

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