Soft start circuit
A technology of soft start circuit and output circuit, which is applied in the direction of circuit devices, battery circuit devices, collectors, etc., can solve the problems of high cost and complicated hardware control circuit, and achieve the effect of avoiding current shock
Active Publication Date: 2019-04-02
EAST GRP CO LTD
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Problems solved by technology
There are two commonly used rectification circuits: one is SCR rectification, that is, controllable rectification; the other is diode rectification, that is, uncontrollable rectification. , but the disadvantage is that the hardware control circuit is complicated, it needs to be isolated and driven, and the cost is high
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[0018] In order to facilitate the understanding of the present invention, the following will describe the present invention more fully. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.
[0020] see figure 1 and figure 2 , is the main power circuit of the soft start circuit in a preferred embodiment of the present invention, where the soft start circuit is used in a high-power chargin...
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The invention relates to a soft boot circuit. The soft boot circuit comprises a main control chip, a main power circuit, a driving signal output circuit, a driving signal output circuit and an interlock circuit of the main control chip, wherein the driving signal output circuit comprises a voltage reduction module, a voltage regulation module, a first comparator U1 and a first triode Q4, the voltage regulation module is connected with the voltage reduction module, and the first triode Q4 is connected with the first comparator U1; an collector electrode C of the first triode Q4 outputs a driving signal RLY_DRI; the interlock circuit comprises an RLY_DRI input end, a first voltage transformation module, a second comparator U2, a resistor R123 and a second triode Q5, the first voltage transformation module is connected with the RLY_DRI input end, the second comparator U2 is connected with the other end of the first voltage transformation module, the resistor R123 is connected with an output end of the second comparator U2, and the second triode Q5 is connected with the other end of the resistor R123; and an collector electrode C of the second triode Q5 is connected with a blocking pin of the main control chip. According to the soft boot circuit, by utilizing the driving signal output circuit and the interlock circuit, the current impact caused when power is off repeatedly in a short time and the soft boot circuit does not work is effectively avoided.
Description
technical field [0001] The invention relates to a high-power charging circuit, in particular to a soft start circuit. Background technique [0002] In high-power DC-DC chargers, if the main power supply is powered by the mains, then a rectifier circuit is required, and in order to ensure sufficient output power, the required bus filter capacitor has a large capacity, so that A soft-start circuit is required to charge the bus capacitors. There are two commonly used rectification circuits: one is SCR rectification, that is, controllable rectification; the other is diode rectification, that is, uncontrollable rectification. , but the disadvantage is that the hardware control circuit is complex and needs to be isolated and driven, and the cost is high. Although the diode rectifier circuit cannot realize the controllability and soft start of the bus voltage, it can also achieve the soft start of the bus voltage with a simple soft start circuit, and the hardware control circuit ...
Claims
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IPC IPC(8): H02J7/02
CPCH02J7/027
Inventor 裴少华汤奇
Owner EAST GRP CO LTD