A circuit board for interior lighting of a refrigerator
Patent Information
- Application Number
- CN202521942430.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-10
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-09-10
AI Technical Summary
[0003]常见制冷设备的照明灯一般通过门灯开关控制，由于冷柜一般为顶盖开启的方式，没法装配门灯开关
本实用新型通过常见滚珠开关SW1、电容C1、MOS管Q1、限流组件和照明组件组成，结构简单、成本低，提高了产品可靠性的同时还能很好的满足消费者的照明需求；另外，为了解决传统滚珠开关电流较小，照明元件功率受限且门体开关时，照明灯存在闪烁情况等问题，本实用新型将滚珠开关SW1改为用于控制MOS管Q1中电流的精准通断，而MOS管Q1则用于放大主回路中的电源并控制各照明灯的开关。
Smart Images
Figure CN224722016U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit board technology, specifically to a circuit board for internal lighting of a freezer. Background Technology
[0002] Currently, most common freezer products do not have internal lighting, which is very inconvenient for consumers. With the increase in consumer demand and product upgrades, it is essential to add internal lighting to freezer products.
[0003] Lighting in common refrigeration equipment is typically controlled by a door light switch. However, since freezers usually open from the top, it's impossible to install a door light switch. Furthermore, the ball switches currently used in the industry have limitations due to their low current draw, which restricts the power of the lighting and results in unsatisfactory illumination. Additionally, the movement of the ball causes the light to flicker when the door is opened or closed, failing to adequately meet consumer needs. Utility Model Content
[0004] To overcome the shortcomings of the prior art, this utility model provides a circuit board for internal lighting of a freezer, the specific technical solution of which is as follows: A circuit board for internal lighting of a freezer includes a main circuit, wherein the main circuit is provided with: The power supply provides current to the main circuit. Current limiting components limit the current magnitude to prevent overload or damage to components in the main circuit; Lighting components provide illumination for the interior of the freezer; Capacitor C1 ensures the stability of the main circuit voltage; MOSFET Q1 amplifies the current in the main circuit; The ball switch SW1 controls the current flow in MOSFET Q1.
[0005] Preferably, the lighting assembly includes a first lighting LED1, a second lighting LED2, a third lighting LED3, a fourth lighting LED4, a fifth lighting LED5, and a sixth lighting LED6.
[0006] Preferably, the current limiting component includes a first current limiting resistor R1, a second current limiting resistor R2, a third current limiting resistor R3, and a fourth current limiting resistor R4.
[0007] Preferably, the MOS transistor Q1 includes a first pin, a second pin, and a third pin.
[0008] Preferably, the positive terminal of the power supply is connected to the first end of the first current-limiting resistor R1, the input terminal of the first lighting LED1, and the input terminal of the fourth lighting LED4; the negative terminal of the power supply is connected to the ground wire; the output terminal of the first lighting LED1 is connected to the input terminal of the second lighting LED2; the output terminal of the second lighting LED2 is connected to the input terminal of the third lighting LED3; the output terminal of the fourth lighting LED4 is connected to the input terminal of the fifth lighting LED5; the output terminal of the fifth lighting LED5 is connected to the input terminal of the sixth lighting LED6; and the second end of the first current-limiting resistor R1 is connected to the ball switch S. The input terminal of W1 is connected; the output terminal of the ball switch SW1 is connected to the first terminal of the second current-limiting resistor R2, the first terminal of the capacitor C1, and the first pin of the MOSFET Q1; the second terminal of the second current-limiting resistor R2 is connected to the negative terminal of the power supply, the second terminal of the capacitor C1, and the third pin of the MOSFET Q1; the first terminal of the third current-limiting resistor R3 is connected to the output terminal of the third lighting LED3; the first terminal of the fourth current-limiting resistor R4 is connected to the output terminal of the sixth lighting LED6; the second terminal of the third current-limiting resistor R3 is connected to the second terminal of the fourth current-limiting resistor R4 and the second pin of the MOSFET Q1.
[0009] Preferably, the voltage of the power supply is 12V; the voltage of the ball switch SW1 is 12V and the current is 20mA.
[0010] Preferably, the capacitance of capacitor C1 is 0.33 to 0.68 μF.
[0011] More preferably, the capacitance of capacitor C1 is 0.47μF.
[0012] Even more preferably, the resistance values of the first current-limiting resistor R1 and the second current-limiting resistor R2 are both 5MΩ.
[0013] More preferably, the resistance values of the third current-limiting resistor R3 and the fourth current-limiting resistor R4 are both 50Ω.
[0014] The beneficial effects of this utility model are: This invention comprises a common ball switch SW1, capacitor C1, MOSFET Q1, current limiting component, and lighting component. It features a simple structure, low cost, and improved product reliability while effectively meeting consumer lighting needs. Furthermore, to address the issues of low current in traditional ball switches, limited power of lighting components, and flickering of lights when the door is opened or closed, this invention replaces the ball switch SW1 with one used to precisely control the current flow in MOSFET Q1. MOSFET Q1 then amplifies the power supply in the main circuit and controls the switching of each lighting lamp. Attached Figure Description
[0015] The accompanying drawings constituting this utility model are provided to further understand this application and do not constitute an undue limitation on this application.
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation
[0017] The specific implementation of a circuit board for internal lighting of a freezer provided by this utility model will be further described with reference to the accompanying drawings and embodiments.
[0018] A circuit board for internal lighting of a freezer includes a main circuit, which is equipped with: a power supply for providing current to the main circuit; a current limiting component for controlling the current and preventing excessive current from causing overload or damage to components; a lighting component for realizing internal lighting of the freezer; a capacitor C1 for ensuring the stability of the main circuit voltage; a MOSFET Q1 for amplifying the current in the main circuit to solve the problem of low current of the ball switch and limited power of the lighting component; and a ball switch SW1 for precisely controlling the current in the MOSFET Q1.
[0019] Specifically, the lighting components include a first lighting LED1, a second lighting LED2, a third lighting LED3, a fourth lighting LED4, a fifth lighting LED5, and a sixth lighting LED6. The current limiting components include a first current limiting resistor R1, a second current limiting resistor R2, a third current limiting resistor R3, and a fourth current limiting resistor R4. The MOSFET Q1 includes a first pin, a second pin, and a third pin.
[0020] like Figure 1As shown, the positive terminal (12V) of the power supply is connected to the first end of the first current-limiting resistor R1, the input terminal of the first lighting LED1, and the input terminal of the fourth lighting LED4; the negative terminal of the power supply is connected to the ground wire; the output terminal of the first lighting LED1 is connected to the input terminal of the second lighting LED2; the output terminal of the second lighting LED2 is connected to the input terminal of the third lighting LED3; the output terminal of the third lighting LED3 is connected to the first end of the third current-limiting resistor R3; the output terminal of the fourth lighting LED4 is connected to the input terminal of the fifth lighting LED5; the output terminal of the fifth lighting LED5 is connected to the input terminal of the sixth lighting LED4. The input terminal of the sixth lighting LED6 is connected; the output terminal of the sixth lighting LED6 is connected to the first terminal of the fourth current-limiting resistor R4; the second terminal of the first current-limiting resistor R1 is connected to the input terminal of the ball switch SW1; the output terminal of the ball switch SW1 is connected to the first terminal of the second current-limiting resistor R2, the first terminal of the capacitor C1, and the first pin of the MOSFET Q1; the second terminal of the second current-limiting resistor R2 is connected to the negative terminal of the power supply, the second terminal of the capacitor C1, and the third pin of the MOSFET Q1; the second terminal of the third current-limiting resistor R3 is connected to the second terminal of the fourth current-limiting resistor R4 and the second pin of the MOSFET Q1.
[0021] Preferably, the voltage of the power supply is 12V; the voltage of the ball switch SW1 is 12V and the current is 20mA.
[0022] It is worth noting that the capacitance of capacitor C1 in this invention is 0.33 to 0.68 μF, and is particularly preferred to be 0.47 μF.
[0023] More preferably, the resistance values of the first current-limiting resistor R1 and the second current-limiting resistor R2 are both 5MΩ.
[0024] More preferably, the resistance values of the third current-limiting resistor R3 and the fourth current-limiting resistor R4 are both 50Ω.
[0025] Traditional freezers either lack internal lighting or use ball-bearing switches for illumination. However, due to the low current draw of ball-bearing switches, the power of the lighting components is limited, and flickering often occurs when the door is opened and closed. This new invention, on the other hand, features a simple structure, low manufacturing cost, and provides stable lighting performance, effectively meeting consumers' lighting needs for the interior of freezers.
[0026] In this utility model, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this utility model and do not specifically refer to any part or element of this utility model; they should not be construed as limiting this utility model. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and they should not be construed as limiting this utility model.
[0027] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.
Claims
1. A circuit board for internal lighting of a freezer, characterized in that, Includes a main circuit, wherein the main circuit is provided with: The power supply provides current to the main circuit. Current limiting components limit the current magnitude to prevent overload or damage to components in the main circuit; Lighting components provide illumination for the interior of the freezer; Capacitor C1 ensures the stability of the main circuit voltage; MOSFET Q1 amplifies the current in the main circuit; The ball switch SW1 controls the current flow of the MOSFET Q1.
2. The circuit board for internal lighting of a freezer according to claim 1, characterized in that, The lighting components include a first lighting LED1, a second lighting LED2, a third lighting LED3, a fourth lighting LED4, a fifth lighting LED5, and a sixth lighting LED6.
3. The circuit board for internal lighting of a freezer according to claim 2, characterized in that, The current limiting component includes a first current limiting resistor R1, a second current limiting resistor R2, a third current limiting resistor R3, and a fourth current limiting resistor R4.
4. The circuit board for internal lighting of a freezer according to claim 3, characterized in that, The MOSFET Q1 includes a first pin, a second pin, and a third pin.
5. The circuit board for internal lighting of a freezer according to claim 4, characterized in that, The positive terminal of the power supply is connected to the first terminal of the first current-limiting resistor R1, the input terminal of the first lighting LED1, and the input terminal of the fourth lighting LED4; the negative terminal of the power supply is connected to the ground wire. The output terminal of the first lighting LED1 is connected to the input terminal of the second lighting LED2; the output terminal of the second lighting LED2 is connected to the input terminal of the third lighting LED3. The output terminal of the fourth lighting LED4 is connected to the input terminal of the fifth lighting LED5; the output terminal of the fifth lighting LED5 is connected to the input terminal of the sixth lighting LED6. The second end of the first current-limiting resistor R1 is connected to the input end of the ball switch SW1; the output end of the ball switch SW1 is connected to the first end of the second current-limiting resistor R2, the first end of the capacitor C1, and the first pin of the MOSFET Q1. The second terminal of the second current-limiting resistor R2 is connected to the negative terminal of the power supply, the second terminal of the capacitor C1, and the third pin of the MOSFET Q1. The first end of the third current-limiting resistor R3 is connected to the output end of the third lighting LED3; the first end of the fourth current-limiting resistor R4 is connected to the output end of the sixth lighting LED6; the second end of the third current-limiting resistor R3 is connected to the second end of the fourth current-limiting resistor R4 and the second pin of the MOS transistor Q1.
6. The circuit board for internal lighting of a freezer according to claim 1, characterized in that, The voltage of the power supply is 12V; The ball switch SW1 has a voltage of 12V and a current of 20mA.
7. The circuit board for internal lighting of a freezer according to claim 1, characterized in that, The capacitance of capacitor C1 is 0.33 to 0.68 μF.
8. The circuit board for internal lighting of a freezer according to claim 7, characterized in that, The capacitance of capacitor C1 is 0.47μF.
9. The circuit board for internal lighting of a freezer according to claim 3, characterized in that, The resistance values of the first current-limiting resistor R1 and the second current-limiting resistor R2 are both 5MΩ.
10. The circuit board for internal lighting of a freezer according to claim 3, characterized in that, The resistance values of the third current-limiting resistor R3 and the fourth current-limiting resistor R4 are both 50Ω.