CN-115740825-B - Infrared welding device and driving method of infrared welding lamp tube

Abstract

The embodiment of the invention discloses an infrared welding device and an infrared welding lamp tube driving method, wherein a switching device is arranged in the device to control the power conduction angle of an infrared welding lamp tube, a controller is configured to control the switching device to switch at a first frequency within a preset time period after the device is started, and to switch at a second frequency after the preset time period passes, wherein the first frequency is larger than the second frequency. Therefore, the starting current of the infrared welding lamp tube can be controlled within a small range at the initial stage of starting the device, so that the heating power of the infrared welding lamp tube is ensured, the cost is reduced, and the infrared welding lamp tube and the switching device are effectively protected.

Inventors

• YAN SHAOPENG
• MA TAO
• YU FENG
• FENG WEIYI

Assignees

• 宁波微鹅电子科技有限公司

Dates

Publication Date

20260508

Application Date

20221205

Claims (5)

1. 1. An infrared welding device, the device comprising: a rectifying circuit configured to convert an input alternating current into a direct current; An infrared welding lamp tube; A switching device connected in series with the infrared welding lamp tube at the output port of the rectifying circuit, and A controller configured to control the switching device to switch at a first frequency within a preset time period after power-on, the preset time period being determined by a time required for preheating the infrared welding lamp, and to control the switching device to switch at a second frequency after the preheating of the infrared welding lamp is completed; Wherein the first frequency is greater than the second frequency; wherein the controller is configured to control the conduction angle of each period of the switching device according to a power control signal after the preset period of time; The conduction angle is used for representing the proportion of the conduction time in each period or the duty ratio of the switch control signal, and the proportion or the duty ratio of the conduction time in each period is set according to the required current rising amplitude or the current value.
2. 2. The apparatus of claim 1, wherein the switching device is a metal oxide semiconductor transistor.
3. 3. The apparatus of claim 1, wherein the rectifying circuit is a bridge rectifying circuit.
4. 4. The apparatus of claim 1, wherein the apparatus further comprises: An inductance element connected in series with the switching device.
5. 5. An infrared welding lamp driving method for driving a switching device connected in series with an infrared welding lamp, the method comprising: Controlling the switching device to switch at a first frequency within a preset time period after power-on, wherein the preset time period is determined by the time required by preheating an infrared welding lamp tube; after the preheating of the infrared welding lamp tube is finished, controlling the switching device to switch at a second frequency; after the preset time period is over, controlling the conduction angle of each period of the switching device according to a power control signal; The first frequency is larger than the second frequency, the conduction angle is used for representing the proportion of the conduction time in each period or the duty ratio of the switch control signal, and the proportion or the duty ratio of the conduction time in each period is set according to the required current rising amplitude or the current value.

Description

Infrared welding device and driving method of infrared welding lamp tube Technical Field The invention relates to the technical field of electronic power, in particular to an infrared welding device and an infrared welding lamp tube driving method. Background With the increasing popularity of novel clean energy sources, solar photovoltaic panels are becoming popular, and the power output requirements of users on photovoltaic panel cells are becoming higher. Because the voltage and the power generated by each photovoltaic small panel battery piece are smaller and cannot meet the practical application, the battery pieces are required to be connected in series and parallel by welding the battery pieces, so that higher power output is realized. The welding battery piece generally uses an infrared welding lamp tube to radiate and heat. In the prior art, the heating power of an infrared welding lamp tube is regulated by controlling the conduction angle through a thyristor. The way to control the heating power is simple but the reliability of the driver power device and the infrared welded lamp is not satisfactory. As the impedance of filaments (such as iodine tungsten, quartz, carbon fiber and the like) of the infrared welding lamp tube mostly has a strong positive temperature coefficient, taking a quartz infrared welding lamp tube with the temperature of 25 ℃ as an example, the impedance is only 4-5 ohms when the temperature of the filaments is 25 ℃, but the impedance can reach 40-50 ohms when the power with the temperature of 1 kW. When the infrared welding lamp tube is started, the instantaneous current is large due to the low impedance of the filament, the instantaneous large current has great influence on the service life of the infrared welding lamp tube, and meanwhile, a power device with higher power level is required to be selected to drive the infrared welding lamp tube, so that the infrared welding lamp tube has larger volume and higher cost. Disclosure of Invention In view of the above, the embodiment of the invention provides an infrared welding device and an infrared welding lamp driving method, so as to effectively protect an infrared welding lamp and a driver power device at a lower cost while ensuring the heating power of the infrared welding lamp. In a first aspect, there is provided an infrared welding device, the device comprising: a rectifying circuit configured to convert an input alternating current into a direct current; An infrared welding lamp tube; A switching device connected in series with the infrared welding lamp tube at the output port of the rectifying circuit, and A controller configured to control the switching device to switch at a first frequency after start-up and to switch at a second frequency after the preheating of the infrared welding lamp is completed; Wherein the first frequency is greater than the second frequency. Optionally, the switching device is a metal oxide semiconductor transistor. Optionally, the rectifying circuit is a bridge rectifying circuit. Optionally, the apparatus further includes: An inductance element connected in series with the switching device. Optionally, the controller is configured to control the switching device to switch at a first frequency within a preset period of time after power-up, and to control the switching device to switch at a second frequency after the preset period of time has elapsed. Optionally, the controller is configured to control the conduction angle of each cycle of the switching tube device according to the power control signal after the preset period of time. In a second aspect, there is provided an infrared welding lamp driving method, the method comprising: controlling the switching device to switch at a first frequency after starting; after the preheating of the infrared welding lamp tube is finished, controlling the switching device to switch at a second frequency; Wherein the first frequency is greater than the second frequency. Optionally, after the starting, controlling the switching device to switch at the first frequency specifically includes: and controlling the switching device to switch at a first frequency within a preset time period after power-on. Optionally, the method further comprises: And after the preset time period, controlling the conduction angle of each period of the switching tube device according to a power control signal. The invention controls the power conduction angle of the infrared welding lamp tube by using the switching device, and configures the controller to control the switching device to switch at a first frequency in a preset time period after power-on, and to switch at a second frequency after the preset time period passes, wherein the first frequency is larger than the second frequency. Therefore, the starting current of the infrared welding lamp tube can be controlled in a small range at the initial stage of starting the device, and the power of the infrared welding lamp tube i