LLC converter digital soft start method

A soft start and converter technology, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electric variables, etc., can solve the problem that the inrush current cannot be limited within a certain range, and achieve control and reduce Effect of Inrush Current

Inactive Publication Date: 2016-04-20
GUANGDONG UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, using this soft start method cannot effectively limit the inrush current within a certain range

Method used

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  • LLC converter digital soft start method
  • LLC converter digital soft start method
  • LLC converter digital soft start method

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Experimental program
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Embodiment Construction

[0021] refer to figure 1 and figure 2 , a digital soft-start method for an LLC converter in a specific embodiment of the present invention includes three steps in sequence.

[0022] First, set the upper limit of the resonant inductor current I for initial soft start rh ( figure 2 shown in ①) and the lower limit-I rl ( figure 2 shown in ②). For different soft-start initial states, the upper and lower limits of the resonant inductor current are different. When the bus voltage V in When it is a stable value, adding a driving pulse requires I rh rl ; When the pulse drive is applied first, the bus voltage rises from zero, it needs to meet the I rh >I rl relation.

[0023] Then according to the design parameters of the circuit, by solving the differential equation, the switching time of each switching tube can be accurately calculated according to the following formula, namely

[0024] figure 1 Middle and upper pipe Q 1 The opening time satisfies the calculation fo...

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Abstract

The invention provides an LLC converter digital soft start method. The method sequentially includes the three steps of firstly, setting the upper limit value and the lower limit value of the current of a resonance inductor during initial soft start, and limiting the surge current during start within the range of stable work of a circuit; secondly, applying a drive pulse when the bus voltage Vin is a stable value, wherein the relation that Irh is smaller than Irl is met, the bus voltage rises from zero when the drive pulse is applied, and the relation that Irh is larger than Irl is met; thirdly, accurately calculating the switch-on and switch-off time of each switching tube by solving the differential equation according to design parameters of the circuit. By means of the method, the surge current of the resonance inductor during start can be limited within the range of the stable work of the circuit, and the surge current of the resonance inductor during start can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics and electric transmission, in particular to a digital soft-start method of an LLC converter used in DC / DC (direct current / direct current) conversion. Background technique [0002] As we all know, electric energy conversion, especially DC / DC (direct current / direct current) conversion technology is widely used in various electronic devices, such as PCs, cellular telephones and the like. This is because the various sub-circuits that make up these devices need to maintain normal operation at different voltage levels, and the DC / DC (direct current / direct current) converter is used to convert from DC power to the required voltage levels. . [0003] As a common linear regulator for DC / DC conversion, it often dissipates too much heat. Nowadays, LLC (inductance-capacitance-inductance) converter has been widely used because of its advantages of high efficiency, smooth waveform and high power den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/32H02M3/335
CPCH02M1/32H02M1/36H02M3/33569
Inventor 李志忠兰尚荣李优新李学易程昱刘东峰梁秀玲
Owner GUANGDONG UNIV OF TECH
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