Electronic ballast

Abstract

The invention discloses an electronic ballast used for ships. The electronic ballast comprises an electromagnetic interference and electromagnetic compatibility circuit, a full-bridge soft start rectification circuit, a power factor correction and boosting circuit, an inverter output circuit and a lamp tube, wherein all components are connected in sequence; an external two-phase 380-volt alternating current electric signal is input into the electromagnetic interference and electromagnetic compatibility circuit; the full-bridge soft start rectification circuit rectifies the two-phase 380-volt alternating current electric signal output by the electromagnetic interference and electromagnetic compatibility circuit into a direct current electric signal; the power factor correction and boostingcircuit is used for improving the power factor of an input power supply, and raising voltage on the inverter output circuit to a voltage value required by the inverter output circuit; the inverter output circuit generates lighting-on current required by the lamp tube to light on the lamp tube, and converts input direct current into sine wave alternating current. According to the electronic ballastused for ships, the power factor and working efficiency are improved, production cost is lowered, and volume occupied by a whole circuit is reduced, and the service life of the whole ballast is prolonged.

Description

technical field [0001] The invention relates to the field of power supply for medium and high pressure gas discharge lamps, in particular to an electronic ballast. Background technique [0002] In my country, the power frequency is 50Hz, such as figure 1 Shown is the output energy waveform diagram of the lamp tube under the traditional transformer control mode under the power frequency frequency, from which it is easy to find that in fact, the output energy of the UV lamp tube (ultraviolet lamp tube) under the traditional control mode is at a frequency of 50Hz. It fluctuates between zero and the maximum value, but the frequency is low and there is a certain stroboscopic phenomenon, and it is easy to affect the stability of power output with the fluctuation of grid voltage. [0003] In addition, most of the ballasts currently on the market use a simple 2-phase or 3-phase 380V direct rectification as the bus voltage. The power factor and voltage are low. The output stage of ...

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Problems solved by technology

[0002] In my country, the power frequency is 50Hz, such as figure 1 Shown is the output energy waveform diagram of the lamp tube under the traditional transformer control mode under the power frequency frequency, from which it is easy to find that in fact, the output energy of the UV lamp tube (ultraviolet lamp tube) under the traditional control mode is at a frequency of 50Hz. It fluctuates between zero and the maximum value, but the frequency is low and there is a certain stroboscopic phenomenon, and it is easy to affect the stability of power output with the fluctuation of grid voltage

[0003] In addition, most of the ballasts currently on the market use a simple 2-phase or 3-phase 380V direct rectification as the bus voltage. The power factor and voltage are low. The output stage of the transformer is boosted by a transformer. Because the bus voltage of this circuit structure is only 538V and fluctuates with the grid voltage, and the output is transmitted by a resonant circuit, the current of the resonant circuit is relatively large. Generally, only high-current IGBT modules can be used. drive

The price of IGBT modules is relatively expensive, and the switching frequency of IGBT is generally relatively low, so it is difficult to make the transformer volume of the output stage small

And because the switching frequency of IGBT mostly works in 10KHZ-20KHZ (the frequency range that can be heard by human ears), the output transformer will be accompanied by high-frequency noise. It is very difficult to eliminate this noise transformer, especially when the power is high. This problem is more prominent

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