Integrated electronic ballast with isolated low-voltage output

Abstract

An integrated electronic ballast with isolated low-voltage output comprises a circuit board, a power supply end and a lighting end are arranged on the circuit board, the power supply end comprises a power supply, a PFC transformer, an output transformer and a power supply output port, and the lighting end comprises a buck transformer, a resonant transformer and a lighting output end. The lighting end and the power supply end are arranged at intervals in the length direction of the circuit board, the power supply is connected with one end of the PFC transformer, the other end of the PFC transformer is connected with one end of the output transformer and one end of the buck transformer, the other end of the output transformer is connected with the power supply output port, and a radiator is arranged on one side of the circuit board in the width direction. The PFC transformer, the buck transformer and the resonant transformer are arranged on the circuit board at intervals in the length direction of the circuit board and are close to the radiator, and the structure is simple and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic ballasts, in particular to an integrated electronic ballast with isolated low-voltage output. Background Art

[0002] With the continuous development of social economy, electronic ballast came into being. It is a kind of ballast, which refers to an electronic device that uses electronic technology to drive an electric light source and produces the required lighting. Its function is to control the brightness of the lamp and provide power for the lamp. In order to facilitate circuit layout, the power supply and electronic ballast of the existing electronic ballast are integrated. Due to the unreasonable layout of the power supply and the electronic ballast, interference will occur between the transformer and the power input terminal, thereby affecting the stability of the entire electronic ballast.

[0003] For example, the patent document with patent application number CN201820394985.4 and announcement date 2018.10.02 discloses an energy-saving lighting power supply, including a circuit board, a transformer is fixedly mounted on the upper outer surface of the circuit board, a relay is fixedly mounted on the upper outer surface of the circuit board, the relay is located on one side of the transformer, a generator is fixedly mounted on the upper outer surface of the circuit board, the generator is located in front of the relay, a No. 1 capacitor is fixedly mounted on the upper outer surface of the circuit board, the No. 1 capacitor is located in front of the generator, and a wiring terminal is fixedly mounted on the upper outer surface of the circuit board, the wiring terminal is located on one side of the relay. The energy-saving lighting power supply in the document is provided with a solder sheet, a safety button and a heat-insulating shell. When the temperature is too high, the solder sheet will melt to disconnect the circuit, and it will automatically pop out when the device leaks electricity, thereby reducing the heat generated by the device.

[0004] However, since the transformer and the generator are closely arranged on the circuit board, and the transformer is a device that is easily affected by frequency, interference is easily generated due to unreasonable layout during use. In addition, during high-frequency lighting, the circuit board monitors the temperature through a temperature sensor and dissipates heat through an insulating casing. There is a lack of a radiator, and the heat dissipation performance is poor. Utility Model Content

[0005] The utility model provides an integrated electronic ballast with isolated low-voltage output, which has a simple structure, is safe and reliable, and has a long service life.

[0006] To achieve the above-mentioned purpose, the technical solution of the utility model is: an integrated electronic ballast with isolated low-voltage output, including a circuit board, a power supply end and a lighting end are arranged on the circuit board, the power supply end includes a power supply and a PFC transformer, an output transformer, and a power output port, the lighting end includes a buck transformer, a resonant transformer and a lighting output end, the lighting end and the power supply end are arranged at intervals along the length direction of the circuit board, the power supply is connected to one end of the PFC transformer, the other end of the PFC transformer is connected to the output transformer and one end of the buck transformer, the other end of the output transformer is connected to the power output port, the other end of the buck transformer is connected to one end of the resonant transformer, and the other end of the resonant transformer is connected to the lighting output end, a heat sink is arranged on one side of the circuit board along the width direction, and the PFC transformer, buck transformer, and resonant transformer are arranged at intervals along the length direction of the circuit board and close to the heat sink.

[0007] The above setting, by spacing the power supply end and the lighting end of the electronic ballast, so that there is a distance between the power supply end and the lighting end, thereby reducing the interference effect of the power supply end on the lighting end, and setting it along the length direction of the circuit board, can more reliably reduce the interference effect, and at the same time, the PFC transformer, buck transformer, and resonant transformer are set close to the radiator, so that the heat generated by the main transformer can be dissipated through the radiator, thereby ensuring the reliability of the product, and the radiator is set on one side along the width direction, thereby ensuring that the radiator has sufficient length, ensuring a certain heat dissipation area, and improving the heat dissipation effect.

[0008] Furthermore, the buck transformer is located in the center of the circuit board, the resonant transformer is located on one side of the buck transformer, the PFC transformer is located on one side of the buck transformer, the output transformer is located in front of the buck transformer, the heat sink is located behind the buck transformer, and the PFC transformer, buck transformer, and resonant transformer are arranged in the same straight line on the circuit board.

[0009] In the above arrangement, the PFC transformer, the buck transformer, and the resonant transformer are arranged in the same straight line on the circuit board, which can not only save the layout of the transformer on the circuit board, but also be conveniently and more likely to be arranged close to the heat sink, and the output transformer is arranged in front of the buck transformer, which can not only reduce the impact of the output transformer on the power supply, but also facilitate its connection with the power output port.

[0010] Furthermore, a temperature detector is fixed on the upper end surface of the circuit board. The temperature detector is located at one end of the circuit board and is arranged along the width direction of the circuit board. The temperature detector is arranged close to the lighting output end.

[0011] In the above arrangement, a temperature detector is provided at one end of the circuit board close to the lighting output end, so that the temperature detector can conveniently collect the temperature of the lighting output end and the transformer on the circuit board, thereby ensuring the stability and reliability of the circuit board.

[0012] Furthermore, the length of the heat sink is greater than the sum of the length of the resonant transformer, the length of the buck transformer, and the length of the PFC transformer.

[0013] The above arrangement enables the radiator to cover the transformers arranged horizontally, thereby ensuring the heat dissipation effect.

[0014] Furthermore, the circuit board, transformer, heat sink and temperature detector are all in the shape of a cuboid.

[0015] The above arrangement dissipates heat through a radiator, which is safe, reliable and has a long service life.

[0016] Furthermore, the power supply is transversely arranged at the other end of the circuit board and is located at an end of the heat sink away from the temperature detector.

[0017] The above arrangement sets the power supply at one end of the heat sink, which can facilitate circuit layout on the one hand and heat dissipation of the heat sink on the other hand.

[0018] Furthermore, a first capacitor is provided on the circuit board, and the first capacitor is provided between the power supply and the PFC transformer, one end of the first capacitor is respectively connected to one end of the power supply, and the other end of the first capacitor is connected to one end of the PFC transformer.

[0019] In the above configuration, the first capacitor filters the input power to ensure the stability of the voltage input to the PFC transformer.

[0020] Furthermore, a second capacitor is provided on the circuit board. The second capacitor is provided between the resonant transformer and the temperature sensor. One end of the second capacitor is connected to the other end of the resonant transformer, and the other end of the second capacitor is connected to the lighting output end.

[0021] The above arrangement ensures the stability of the lighting output terminal through the arrangement of the second capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a schematic diagram of the overall structure of an integrated electronic ballast with isolated low-voltage output.

[0023] Figure 2 The utility model is a top view of an integrated electronic ballast with isolated low-voltage output.

[0024] Figure 3The utility model is a circuit block diagram of an integrated electronic ballast with isolated low-voltage output.

[0025] 1—circuit board; 2—PFC transformer; 3—output transformer; 4—buck transformer; 5—resonant transformer; 6—heat sink; 7—temperature detector; 8—lighting output terminal; 9—power output port; 10—power input port; 11—first capacitor; 12—second capacitor; 13—power supply. DETAILED DESCRIPTION

[0026] like Figure 1-3 As shown, an integrated electronic ballast with isolated low-voltage output includes a circuit board 1, on which a power supply end and a lighting end are arranged, the power supply end includes a power supply 13 and a PFC transformer 2, an output transformer 3, and a power supply output port 9, the lighting end includes a buck transformer 4, a resonant transformer 5 and a lighting output port 8, the lighting end and the power supply end are arranged at intervals along the length direction of the circuit board, the power supply 13 is connected to one end of the PFC transformer 2, the other end of the PFC transformer 2 is connected to the output transformer 3 and one end of the buck transformer 4, the other end of the output transformer 3 is connected to the power output port 9, the other end of the buck transformer 4 is connected to one end of the resonant transformer 5, and the other end of the resonant transformer 5 is connected to the lighting output port 8, a heat sink 6 is arranged on one side of the circuit board along the width direction, the PFC transformer 2, the buck transformer 4, and the resonant transformer 5 are arranged at intervals along the length direction of the circuit board and are arranged close to the heat sink 6.

[0027] like Figure 1 and Figure 2 As shown, in this embodiment, the buck transformer 4 is located in the center of the circuit board, the resonant transformer 5 is located on one side of the buck transformer 4, the PFC transformer 2 is located on one side of the buck transformer 4, the output transformer 3 is located in front of the buck transformer 4, and the heat sink 6 is located behind the buck transformer 4. A first capacitor 11 is fixed on the outer surface of the upper end of the circuit board, and the first capacitor 11 is located on one side of the PFC transformer 2. A second capacitor 12 is fixed on the outer surface of the upper end of the circuit board, and the second capacitor 12 is located on one side of the resonant transformer 5. One end of the first capacitor 11 is respectively connected to one end of the power supply 13, and the other end of the first capacitor 11 is connected to one end of the PFC transformer 2, and one end of the second capacitor 12 is connected to the other end of the resonant transformer 5, and the other end of the second capacitor 12 is connected to the lighting output terminal 8.

[0028] The circuit board 1, transformer, heat sink 6, and temperature detector 7 are all in the shape of a cuboid. The temperature detector 7 can monitor the temperature of the circuit board and the transformer. The heat sink 6 is in the shape of a cuboid and is located behind the transformer. The length of the heat sink 6 is greater than the sum of the lengths of the PFC transformer 2, the buck transformer 4, and the resonant transformer 5, which can reduce the heat generated by the device and reduce energy consumption.

[0029] like Figure 2 As shown, the power supply end also includes a power input port 10, through which the power is input into the PFC transformer 2, and the buck transformer 4, the resonant transformer 5, the second capacitor 12 and the lighting output terminal 8 form a lighting end, and the power supply 13 is arranged horizontally at the other end of the circuit board and at the end of the heat sink 6 away from the temperature detector 7. The lighting output terminal 8 and the power output port 9 are respectively located on both sides of the circuit board and are far away from each other, so as to ensure that the regulated voltage and current are not disturbed and improve stability.

[0030] The output transformer 3 , the buck transformer 4 , the resonant transformer 5 , the PFC transformer 2 , the temperature detector 7 , the heat sink 6 , the first capacitor 11 , and the second capacitor 12 are all electrically connected to the power input terminal 10 .

[0031] In this embodiment, the PFC transformer 2, the buck transformer 4, and the resonant transformer 5 are existing transformers, and the output transformer is also an existing transformer, and the specific working principles thereof will not be described again.

[0032] The working principle of the utility model is as follows: the power supply reaches the first capacitor 11 through the power input terminal 10, and reaches the PFC transformer 2 through the first capacitor 11. The PFC transformer 2 mainly reduces harmonics to help meet the requirements of electromagnetic compatibility and avoid electromagnetic interference. Then it reaches the output transformer 3, which is mainly to prevent damage to user equipment caused by abnormal conditions such as overload and short circuit. Then it reaches the resonant transformer 5 through the output transformer 3 on the one hand, and the output transformer 3 outputs a stable low-voltage voltage signal to provide power to other devices on the other hand. The resonant transformer 5 is used to obtain a larger load current with a smaller excitation current. Then it reaches the buck transformer 4 through the resonant transformer 5. The buck transformer 4 mainly ensures the stability of the output voltage when the input voltage is adjusted within a larger range, and provides a stable output voltage. Then it reaches the lighting output terminal 8 through the second capacitor 12, completes the stable output, enhances the output reliability, and prolongs the service life.

Claims

1. An integrated electronic ballast with isolated low-voltage output, comprising a circuit board, a power supply terminal and a lighting terminal are provided on the circuit board, and is characterized in that: The power supply end includes a power supply and a PFC transformer, an output transformer, and a power output port. The lighting end includes a buck transformer, a resonant transformer, and a lighting output port. The lighting end and the power supply end are spaced apart along the length direction of the circuit board. The power supply is connected to one end of the PFC transformer, the other end of the PFC transformer is connected to the output transformer and one end of the buck transformer, the other end of the output transformer is connected to the power output port, the other end of the buck transformer is connected to one end of the resonant transformer, and the other end of the resonant transformer is connected to the lighting output port. A heat sink is provided on one side of the circuit board along the width direction. The PFC transformer, buck transformer, and resonant transformer are spaced apart on the circuit board along the length direction of the circuit board and are arranged close to the heat sink.

2. The integrated electronic ballast with isolated low-voltage output according to claim 1, characterized in that: The buck transformer is located in the center of the circuit board, the resonant transformer is located on one side of the buck transformer, the PFC transformer is located on one side of the buck transformer, the output transformer is located in front of the buck transformer, the heat sink is located behind the buck transformer, and the PFC transformer, buck transformer, and resonant transformer are arranged in the same straight line on the circuit board.

3. The integrated electronic ballast with isolated low-voltage output according to claim 1, characterized in that: A temperature detector is fixed on the upper end surface of the circuit board. The temperature detector is located at one end of the circuit board and is arranged along the width direction of the circuit board. The temperature detector is arranged close to the lighting output end.

4. The integrated electronic ballast with isolated low-voltage output according to claim 1, characterized in that: The length of the heat sink is greater than the sum of the length of the resonant transformer, the length of the buck transformer, and the length of the PFC transformer.

5. The integrated electronic ballast with isolated low-voltage output according to claim 1, characterized in that: The circuit board, transformer, radiator and temperature detector are all in the shape of rectangular parallelepiped.

6. The integrated electronic ballast with isolated low-voltage output according to claim 3, characterized in that: The power supply is transversely arranged at the other end of the circuit board and is located at an end of the heat sink away from the temperature detector.

7. The integrated electronic ballast with isolated low-voltage output according to claim 1, characterized in that: A first capacitor is arranged on the circuit board, and the first capacitor is arranged between the power supply and the PFC transformer. One end of the first capacitor is respectively connected to one end of the power supply, and the other end of the first capacitor is connected to one end of the PFC transformer.

8. The integrated electronic ballast with isolated low-voltage output according to claim 1, characterized in that: A second capacitor is also arranged on the circuit board. The second capacitor is arranged between the resonant transformer and the temperature sensor. One end of the second capacitor is connected to the other end of the resonant transformer, and the other end of the second capacitor is connected to the lighting output end.

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