A converter synchronous rectification driving circuit
A synchronous rectification and drive circuit technology, applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, instruments, etc., can solve problems such as coupling voltage spikes and hidden dangers of device reliability
Active Publication Date: 2017-03-22
SHENZHEN VMAX NEW ENERGY CO LTD
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Problems solved by technology
However, the driving signal originates from the transformer winding. When the switching device is turned off, the driving signal will inevitably be coupled with a voltage spike.
Although the existing patented circuit has clamped the drive level, using a signal coupled with a voltage spike to drive the MOSFET will still bring hidden dangers to the reliability of the device
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[0018] figure 1 It is a circuit diagram of clamping the freewheeling tube in the prior art, and the clamping circuit performs forward and reverse driving level clamping on the freewheeling tube Q4. Among them, the forward clamping is realized by the diode D1 and the N-channel MOSFET Q5. When the driving winding W3 is negative and positive, D1 is turned on. A fixed positive voltage Vp is applied to the gate of Q5. Due to the limitation of the conduction threshold level of the N-channel MOSFET, the source level of Q5 is always lower than the gate level when Q5 is turned on. Therefore, the source of Q5, that is, the gate level of Q4 is always clamped at a level lower than Vp, thereby protecting the gate of the freewheeling transistor Q4. As for Q4 negative drive level clamp, it is realized by P-channel MOSFET Q6. When the drive winding W3 is positive and negative, the gate level of Q6 is negative, which is lower than its source level (the gate of Q4 maintains a high level befor...
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The invention discloses a synchronization rectifier driving circuit of a convertor. The synchronization rectifier driving circuit of the convertor comprises a main transformer, the main transformer comprises a primary side winding (W1), a rectifier tube driving winding (W4), a secondary side power winding (W2), a follow current tube driving winding (W3), a rectifier tube (Q1) is serially connected with the secondary side power winding, the follow current tube is driven by the follow current tube driving winding, the grid of the rectifier tube is connected with the positive clamping circuit and the negative clamping circuit; an outer driving clamping circuit is provided, at the end of the switching period, the low level of the pulse signal is used for driving the negative clamping tube for discharging the power for the grid of the synchronous rectification MOSFET. The coupling voltage peak and the energy are small while the signal roots in control circuit main control IC, the hidden danger for damaging the MOSFET grid from the existing self-driving clamping circuit drive signal peak can be avoided and the stability and service life of the DC / DC convertor can be greatly improved.
Description
technical field [0001] The invention relates to a DC / DC converter, in particular to a synchronous rectification driving circuit of the DC / DC converter with good protection effect. Background technique [0002] Synchronous rectification is the key technology of low-voltage and high-current DC / DC converters. Compared with traditional Schottky rectification technology, synchronous rectification can greatly reduce losses and improve efficiency. There are two existing driving methods for synchronous rectification: one method is self-driving through the main transformer driving winding, that is, the main transformer provides both power conversion and driving signals; the other method is that the main transformer only provides power conversion, The drive signal is provided by a circuit other than the main transformer. The circuit using the winding self-driving method is relatively simple and does not require additional circuits, but the driving level varies greatly with the input / ...
Claims
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IPC IPC(8): H02M3/335H02M7/217
CPCY02B70/10
Inventor 徐鹏华曹云刘金云
Owner SHENZHEN VMAX NEW ENERGY CO LTD