240W resonant half-bridge switching power supply

Abstract

The utility model discloses a 240W resonant half-bridge switching power supply, which comprises a shell and a heat dissipation assembly, a circuit board is arranged in the shell, the heat dissipation assembly comprises a heat dissipation fan and an air inlet block, dust screens are arranged on two sides of the air inlet block, the bottom of the shell is arranged in a groove shape, and a through hole is formed in the groove-shaped position of the bottom of the shell. The heat dissipation assembly can divide air flow into two reverse air flows, the two reverse air flows firstly dissipate heat of the bottom of the circuit board and are turned back by the surface of the shell, and the turned-back air flow can dissipate heat again through the top of the circuit board, so that the heat dissipation speed in the switching power supply is increased, and the heat dissipation efficiency is improved. The heat dissipation efficiency is improved, protection of electrical components on the circuit board is enhanced, and the arranged cleaning piece can clean the dust screen through collision, so that the situation that dust is accumulated in the dust screen to affect the heat dissipation work of the switching power supply is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of switching power supplies, in particular to a 240W resonant half-bridge switching power supply. Background Art

[0002] A switching mode power supply, also known as an exchange power supply or a switching converter, is a high-frequency power conversion device. A resonant half-bridge switching power supply is a specific type of resonant switching power supply that uses a half-bridge topology and a resonant circuit to achieve efficient power conversion. The resonant half-bridge switching power supply achieves high efficiency, low EMI, and high power density power conversion by optimizing the switching process and utilizing a resonant circuit. It is an important development direction in modern power electronics technology.

[0003] After long-term use, a large amount of high temperature will be generated inside the switching power supply. The traditional way to deal with it is usually to set corresponding heat dissipation holes on the switching power supply housing for heat dissipation. However, this method has poor heat dissipation effect and can easily cause damage to the internal components of the switching power supply. Utility Model Content

[0004] The present invention aims to solve the problem in the prior art that the heat dissipation effect of the switching power supply is poor and may easily cause damage to the internal components of the switching power supply, and proposes the following technical solutions:

[0005] A 240W resonant half-bridge switching power supply comprises: a housing and a heat dissipation assembly, wherein a circuit board is arranged inside the housing, the heat dissipation assembly comprises a cooling fan and an air intake block, dust screens are arranged on both sides of the air intake block, the bottom of the housing is arranged in a groove shape, a through hole is opened in the groove shape of the bottom of the housing, and the air intake block is located on top of the through hole.

[0006] As a preferred embodiment of the above technical solution, the heat dissipation assembly also includes a cleaning piece, which includes a mounting plate and a rotating shaft rotatably inserted in the mounting plate, a torsion spring is arranged between the rotating shaft and the mounting plate, vibration rods are arranged on both sides of the top of the rotating shaft, and a pull rope is arranged at the bottom of the rotating shaft.

[0007] As a preferred embodiment of the above technical solution, one end of the vibration rod is spherical, and the spherical end of the vibration rod is used to impact the dust screen.

[0008] As a preferred embodiment of the above technical solution, one end of the pull rope is fixedly connected to the rotating shaft, and a section of the pull rope is wound around the surface of the rotating shaft.

[0009] As a preferred embodiment of the above technical solution, the housing consists of a bottom shell and a top cover, the bottom shell and the top cover are fixedly connected by screws, and the cooling fan is installed on the top cover.

[0010] The beneficial effects of the utility model are:

[0011] 1. The heat dissipation component can be used to divide the airflow into two opposite streams. The two opposite airflows first dissipate heat to the bottom of the circuit board and are reflected back by the surface of the shell. The reflected airflow can then pass through the top of the circuit board to dissipate heat again, thereby accelerating the heat dissipation speed inside the switching power supply, improving the heat dissipation efficiency and strengthening the protection of the electrical components on the circuit board.

[0012] 2. The cleaning piece can clean the dust screen by impacting it, so as to prevent dust from accumulating in the dust screen and affecting the heat dissipation of the switching power supply. The setting of the cleaning piece can make the switching power supply more applicable and able to work in more severe environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 What is shown is a schematic diagram of the overall structure of the embodiment;

[0014] Figure 2 Shown is an exploded schematic diagram of an embodiment;

[0015] Figure 3 Shown is a front cross-sectional view of an embodiment;

[0016] Figure 4 Shown is the internal circuit diagram of the circuit board in the embodiment.

[0017] In the figure: 10, outer shell; 11, bottom shell; 12, top cover; 13, through hole; 20, circuit board; 31, cooling fan; 32, air intake block; 33, dust screen; 34, cleaning part; 341, rotating shaft; 342, vibration rod; 343, pull rope. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings.

[0019] Example

[0020] Figure 1-Figure 3 In the figure, a 240W resonant half-bridge switching power supply includes: a housing 10 and a heat dissipation component. A circuit board 20 is arranged inside the housing 10. The heat dissipation component includes a cooling fan 31 and an air intake block 32. Dust screens 33 are arranged on both sides of the air intake block 32. The bottom of the housing 10 is groove-shaped, and a through hole 13 is opened in the groove-shaped portion of the bottom of the housing 10. The air intake block 32 is located at the top of the through hole 13.

[0021] When the switching power supply is working, the cooling fan 31 starts up, and the airflow on both sides of the shell 10 enters the through hole 13 along the grooved bottom of the shell 10. After the airflow is gathered, it is diverted into the shell 10 through the dust screen 33 on both sides of the air inlet block 32. The incoming airflow is divided into two streams, passes through the bottom of the circuit board 20 and turns back. The turned-back airflow passes through the top of the circuit board 20 and is discharged by the cooling fan 31.

[0022] The heat dissipation assembly is provided to divide the airflow into two opposite streams. The two opposite airflows first dissipate heat at the bottom of the circuit board 20 and are reflected back by the surface of the housing 10. The reflected airflow can then pass through the top of the circuit board 20 to dissipate heat again, thereby accelerating the heat dissipation speed inside the switching power supply, improving the heat dissipation efficiency, and strengthening the protection of the electrical components on the circuit board 20.

[0023] Figure 3 In the figure, the heat dissipation assembly also includes a cleaning piece 34, which includes a mounting plate and a rotating shaft 341 rotatably inserted in the mounting plate. A torsion spring is provided between the rotating shaft 341 and the mounting plate. The two ends of the torsion spring are respectively fixedly connected to the rotating shaft 341 and the mounting plate. Vibration rods 342 are provided on both sides of the top of the rotating shaft 341, and a pull rope 343 is provided at the bottom of the rotating shaft 341.

[0024] Pulling the pull rope 343 causes the rotating shaft 341 to rotate, and the torsion spring is twisted and deformed. The rotating shaft 341 drives the vibration rods 342 on both sides to move and contact the dust screen 33. After the dust screen 33 is hit, the dust inside the dust screen 33 is cleaned. After loosening the pull rope 343, the torsion spring drives the rotating shaft 341 and the vibration rod 342 to reset. The dust screen 33 can be continuously cleaned by loosening the pull rope 343 multiple times.

[0025] The cleaning member 34 can clean the dust screen 33 by impacting it, preventing dust from accumulating in the dust screen 33 and affecting the heat dissipation of the switching power supply. The setting of the cleaning member 34 can make the switching power supply more applicable and able to work in more severe environments.

[0026] Figure 3 In the embodiment, one end of the vibration rod 342 is spherical, and the spherical end of the vibration rod 342 is used to impact the dust screen 33.

[0027] The spherical vibration rod 342 can increase the vibration effect on the dust screen 33, thereby making the dust screen 33 easier to clean.

[0028] Figure 3 In the embodiment, one end of the pull rope 343 is fixedly connected to the rotating shaft 341 , and a section of the pull rope 343 is wound around the surface of the rotating shaft 341 .

[0029] After the pull rope 343 is loosened, the rotating shaft 341 rotates and returns to its original position to partially wind the pull rope 343 . Only after the pull rope 343 is wound can the rotating shaft 341 be pulled to rotate.

[0030] Figure 1-Figure 3 In the embodiment, the housing 10 is composed of a bottom shell 11 and a top cover 12 , the bottom shell 11 and the top cover 12 are fixedly connected by screws, and the cooling fan 31 is installed on the top cover 12 .

[0031] Figure 4 This 240W resonant half-bridge switching power supply adopts a half-bridge LLC series resonant converter (abbreviated as: half-bridge LLC converter) topology. The configuration of the resonant capacitor and resonant inductor in the half-bridge LLC converter has different schemes such as single resonant capacitor (CS) and split resonant capacitor (CS1 and CS2).

[0032] Depending on the load conditions, the frequency of the half-bridge LLC converter will vary. For a discrete resonant tank solution, two resonant frequencies can be defined: the series resonant frequency Fs and the minimum resonant frequency Fmin.

[0033]

[0034] The operating frequency of a half-bridge LLC converter depends on the power demand. When the power demand is low, the operating frequency is quite high, exceeding the resonance point. Conversely, when the power demand is high, the control loop reduces the switching frequency so that one of the resonant frequencies provides the current required by the load. In general, a half-bridge LLC converter operates in five different operating states: a. Between Fs and Fmin; b. Directly resonant at Fs; c. Above Fs; d. Between Fs and Fmin - overload; e. Below Fmin. Compared to discrete tank circuit solutions, integrated tank circuit solutions have different behavioral characteristics. For half-bridge LLC, the secondary diode is always in the off state. The resonant inductor Ls and the excitation inductor Lm do not participate in the resonance together as in discrete resonant circuit solutions. The integrated tank circuit solution can also define two resonant frequencies Fs and Fmin, where:

[0035]

[0036] This solution also has five working states: a. Between Fs and Fmin; b. Direct resonance at Fs; c. Above Fs; d. Between Fs and Fmin - overload; e. Below Fmin.

[0037] The ever-increasing power density of switching power supplies is being limited by the size of passive components. High-frequency operation can significantly reduce the size of passive components, such as transformers and filters. However, excessive switching losses are a major obstacle to high-frequency operation. To reduce switching losses and enable high-frequency operation, resonant switching conversion technology has been developed. These technologies process power sinusoidally, enabling soft commutation of switching devices. This significantly reduces switching losses and noise.

[0038] The 240W resonant half-bridge switching power supply utilizes a resonant half-bridge topology, featuring a highly efficient and energy-efficient design. It features a minimal number of external components, with only a single transformer for integrated energy storage and conversion. This design allows for ample heat dissipation. The controller, codenamed TEA1716T, is a resonant converter integrated power management controller. It integrates both a power factor correction (PFC) control unit and a resonant converter control unit. With a full input voltage range of 70V-276VAC, this design utilizes a low-cost, minimal-component design. The input enable function (which can enable PFC only or PFC + HBC) simplifies the peripheral circuitry, saves components, and reduces unnecessary interference. A built-in high-voltage startup source enhances reliability in standby mode or with an external DC power supply. It features extremely low IC losses in burst mode and a critical operation mode with a fixed on-time (Ton) control scheme. Valley / zero-voltage switching (to reduce switching losses) limits the operating frequency to minimize switching losses. It also includes precise boost voltage regulation. Burst mode allows for soft start / stop switching. It also features integrated high-voltage level shifting. The maximum operating frequency of the half-bridge switch is 500kHz. Adaptive non-overlap time (anti-shoot-through crossover time / dead time) is included. A safe restart mode is provided for burst mode switch fault conditions. Output overvoltage / overtemperature lockout protection, restart, and timer protection are provided. Both controllers can soft-start or soft-restart. Input voltage (brownout protection), boost voltage, and IC supply undervoltage protection are also provided, along with precise boost voltage overvoltage detection. Overcurrent regulation and protection are provided for both controllers, along with capacitive mode protection for the half-bridge controller. The TEA1716 offers multiple protection features, such as detecting overpower or half-bridge switch damage and providing responsive protection. This protection is achieved by adjusting the operating frequency to handle faults or ensuring safe IC operation until the system stops or restarts (timer function), minimizing component damage. These powerful protection features ensure reliable power supply operation.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. 240W resonant half-bridge switching power supply, including: A housing (10) and a heat dissipation assembly, wherein a circuit board (20) is arranged inside the housing (10), and the heat dissipation assembly includes a heat dissipation fan (31) and an air intake block (32), dust screens (33) are arranged on both sides of the air intake block (32), the bottom of the housing (10) is arranged in a groove shape, a through hole (13) is opened in the groove shape of the bottom of the housing (10), and the air intake block (32) is located at the top of the through hole (13).

2. The 240W resonant half-bridge switching power supply according to claim 1, characterized in that: The heat dissipation assembly further comprises a cleaning piece (34), the cleaning piece (34) comprising a mounting plate and a rotating shaft (341) rotatably plugged into the mounting plate, a torsion spring being arranged between the rotating shaft (341) and the mounting plate, vibration rods (342) being arranged on both sides of the top of the rotating shaft (341), and a pull rope (343) being arranged at the bottom of the rotating shaft (341).

3. The 240W resonant half-bridge switching power supply according to claim 2, characterized in that: One end of the vibration rod (342) is spherical, and the spherical end of the vibration rod (342) is used to impact the dust isolation net (33).

4. The 240W resonant half-bridge switching power supply according to claim 2, characterized in that: One end of the pull rope (343) is fixedly connected to the rotating shaft (341), and a section of the pull rope (343) is wound around the surface of the rotating shaft (341).

5. The 240W resonant half-bridge switching power supply according to claim 1, characterized in that: The housing (10) is composed of a bottom shell (11) and a top cover (12). The bottom shell (11) and the top cover (12) are fixedly connected by screws, and the cooling fan (31) is installed on the top cover (12).

Images