Self-adaptive adjustable delay circuit for soft-switch ZVT (zero voltage transformation) converter
A delay circuit and converter technology, applied in the direction of converting AC power input to DC power output, electrical components, climate sustainability, etc., can solve problems such as effective duty cycle loss, current conditioning circuit bias, noise interference, etc. , to achieve the effect of reducing electromagnetic interference, reducing switching loss, and optimizing the operating environment
Active Publication Date: 2014-09-03
SHANDONG UNIV
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Problems solved by technology
If a fixed delay time is used, when the load current is small, the main switch will quickly reach the zero voltage state within the delay time, but it will not be turned on until the delay time is up, which may result in a loss of effective duty cycle; while the load current is large When the coupling inductor current rises to the load current and the time to start resonance is too long, the time for the main switch to reach zero voltage is prolonged, which is longer than the fixed delay time. When the delay time is up and the main switch is turned on due to the voltage at both ends Has not resonated to zero, so ZVS cannot be achieved
In order to solve the above problems, it is proposed to change the fixed delay to adjustable delay control. The basic idea is to adjust the delay time according to the magnitude and direction of the load current, but it is difficult to judge the magnitude and direction of the load current at the zero crossing point. And there are noise interference and bias problems of the current conditioning circuit
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[0028] The present invention is described in detail below in conjunction with accompanying drawing:
[0029] In this application, the soft-switching ZVT converter takes the coupled inductor soft-switching ZVT inverter as an example, and its one-bridge topology is as follows figure 1 shown. figure 1 Middle S 1 , S 2 Respectively for the upper and lower main switches of the same bridge; S x1 , S x2 S respectively 1 , S 2 Auxiliary switch; T r1 , T r2 For the two coupled inductors, L m1 , L r1 Respectively T r1 The magnetizing inductance and leakage inductance, L m2 , L r2 Respectively T r2 The excitation inductance and leakage inductance; C 1 、C 2 is the resonant capacitance; D x1 -D x6 for the auxiliary diode. Both the main switch and the auxiliary switch use IGBT tubes. and figure 1 The same two sets of topologies can constitute a single-phase H-bridge soft-switching ZVT inverter, in which the midpoint of the main switching bridge is filtered by an LC low-p...
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The invention discloses a self-adaptive adjustable delay circuit for a soft-switch ZVT (zero voltage transformation) converter. The soft-switch ZVT converter is characterized in that an auxiliary switch is introduced in a main circuit, the auxiliary switch is conducted before the conduction of the corresponding main switch, and the starting time of the resonance oscillation is controlled through the auxiliary switch. The self-adaptive adjustable delay circuit comprises a main switch zero-pass detection circuit which is used for detecting a voltage zero-pass point of a main switch of the converter and a main-auxiliary switch logic control circuit which is used for automatically adjusting the delay time between the auxiliary switch and the main switch of the converter; the main-auxiliary switch logic control circuit is used for enabling the main switch to be switched on according to the zero-pass point of the main switch detected by the main switch zero-pass detection circuit at the moment when voltage of the main switch is reduced to zero. The delay time between the auxiliary switch and the main switch is automatically adjusted, so that the main switch is switched on just at the moment when the voltage of the main switch is reduced to zero, the self-adaptive control of the zero voltage switch is realized, and the high-efficiency operation of the soft switch in the full-load variation range of the converter can be realized.
Description
technical field [0001] The invention relates to an adaptive adjustable delay circuit for a soft-switching ZVT converter, in particular to an adaptive adjustable delay circuit for a bridge-type soft-switching ZVT inverter. Background technique [0002] High power density and small size and light weight are one of the development trends of power electronic converters, and high frequency is an inevitable choice to achieve this goal. Traditional hard switching leads to high switching loss and high voltage and current stress with the increase of switching frequency, which reduces the efficiency and reliability of the converter, thus limiting the miniaturization and weight reduction of the converter. The soft switching technology introduces a resonant circuit and controls the switching process of the switching device to make it switch in a state of zero voltage or zero current, thereby significantly reducing or even eliminating switching losses. Therefore, soft switching technolo...
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IPC IPC(8): H02M7/5395
CPCY02B70/1491Y02B70/10
Inventor王玉斌董彦彦林意斐封波
OwnerSHANDONG UNIV