Snubber circuit for DC-DC voltage converter
A DC voltage and converter technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and high-efficiency power electronic conversion, which can solve the problems of high manufacturing cost and expensive components.
Active Publication Date: 2014-02-05
ROBERT BOSCH GMBH
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Problems solved by technology
Inductive components such as snubber reactors, which are usually used in step-down converters, in particular are associated with high unit costs, since the components themselves are relatively expensive and also cause high manufacturing costs during installation
Method used
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Embodiment Construction
[0014] figure 1 A schematic diagram of a DC voltage converter 1 is shown. The direct voltage converter 1 comprises a transformer 2 with a primary-side winding 2 a and a secondary-side winding which is divided into two subsections 2 b and 2 c via a center tap. The transformer 2 can be designed, for example, to convert a high voltage into a low voltage and for example have a winding ratio between the primary-side and secondary-side windings higher than 1, in particular eg 10:1. The winding ratio of the two secondary-side winding sections 2b and 2c may not be equal to 1. In particular, this winding ratio can be 1, ie the two secondary-side winding sections 2b and 2c have the same number of windings.
[0015] In this case, the center tap is connected via a secondary-side inductance 3 to the first output connection 9 a. The two end-side taps of the respective secondary-side winding sections 2b and 2c are connected on the one hand to the two inputs of the synchronous rectifier c...
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The invention relates to a DC-DC voltage converter (1), having a transformer (2) having a primary winding (2a) and a secondary winding (2b, 2c) having a centre tap, an output inductor (3), which is connected to the centre tap and to a first output connection (9a), a synchronous rectifier circuit (4) having two synchronous rectifier switches (14a, 14b), each of which is connected to the terminal taps of the secondary winding (2b, 2c), and which are designed to produce a rectified output voltage on a second output connection (9b), and a snubber circuit (5) that is switched by means of the synchronous rectifier circuit (4). In this case, the snubber circuit has two diodes (16a, 16b), each of which is coupled to the terminal taps of the secondary winding (2b, 2c), a capacitor (6), which is coupled to the two diodes (16a, 16b) and which is designed to store resonant oscillation energy arising in the synchronous rectifier circuit (4), and a discharge circuit (7) comprising a series circuit containing a discharge switch (18) and a resistor (17), wherein the discharge circuit (7) is coupled between the first output connection (9a) and the capacitor and is designed to selectively feed back stored charge in the capacitor (6) to the first output connection (9a).
Description
technical field [0001] The invention relates to a snubber circuit for a DC voltage converter, in particular for a midpoint rectifier with synchronous rectification. Background technique [0002] Synchronous rectifier circuits are usually used for DC voltage conversion, for example for supplying the low-voltage on-board electrical system of the vehicle. Power semiconductor switches used for this purpose, for example MOSFETs, have precisely lower loss voltages than diodes at higher DC currents, so that the efficiency of the rectifier can be increased. Due to the output capacitance of the blocked semiconductor switches, in the case of electrically decoupled synchronous rectifiers, the phenomenon of “secondary ringing”, that is to say undesired oscillations of the current or voltage, can occur. In this case, a resonance occurs between the secondary-side stray inductance of the transformer with the secondary-side inductance and the output capacitance of the semiconductor switch....
Claims
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IPC IPC(8): H02M3/335H02M1/34
CPCH02M1/34Y02B70/1475Y02B70/1433H02M3/33592Y02B70/10H02M3/33507
Inventor S.科赫J.田
Owner ROBERT BOSCH GMBH