A kind of slow start circuit, controller and power supply equipment
A slow-start circuit and start-up control technology, applied in the field of circuits, can solve the problems of poor current sharing effect of MOSFETs, inability to share currents, and inability of MOSFETs to be directly connected in parallel for capacity expansion.
Active Publication Date: 2021-10-26
HUAWEI TECH CO LTD
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Problems solved by technology
Due to individual differences in the parameters of each MOSFET (such as turn-on voltage, transconductance, and resistance), the parallel MOSFET current sharing effect is very poor, and it cannot share current at all under extreme conditions. In the case of uneven current sharing, it may exceed the MOSFET. Safe operation area (SOA) capabilities
Therefore, in this kind of slow-start circuit with MOSFET as the core component, MOSFETs cannot be directly connected in parallel to expand capacity. With the increase of power supply, this kind of slow-start circuit with MOSFET as the core component cannot meet the needs of high-power evolution
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[0022] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.
[0023] The terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprisin...
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The present application discloses a slow start circuit, a controller and a power supply device. The slow start circuit includes: at least two slow start units and a controller, and the slow start unit includes a first operational amplifier, a first MOSFET and a first detector The non-inverting input of the first operational amplifier is connected to the controller, the inverting input is connected to the first end of the first current-sensing element, and the output is connected to the gate of the first MOSFET. The source of the first MOSFET is connected to the first end of the first current detection element, and the drain is connected to the load device. The negative pole of the input power supply is connected to the second terminal of the first current-sensing element, and the positive pole is connected to the load device; the controller is used to provide the same voltage signal to the first operational amplifier, so that the current of the first MOSFET is the same, regardless of the parameters of the MOSFET influences. When the power of the power supply is increased and parallel expansion is required, it can meet the needs of high-power evolution.
Description
technical field [0001] The present application relates to the field of circuits, in particular to a slow start circuit, a controller and power supply equipment. Background technique [0002] In the communication system, there are capacitances in some load devices. When this kind of load devices are powered on, the capacitors in the load devices are prone to short circuit. Once a short circuit occurs, the current in the power supply circuit will instantly form a peak value, which may cause the front circuit Overload restart may even cause damage to devices on the power supply circuit. Therefore, it is necessary to add a slow start circuit on the power supply circuit. [0003] A commonly used slow start circuit may use a metal oxide semiconductor field effect transistor (MOSFET) as a core component. When the load device is connected to the power supply circuit, the load device is connected in series with the MOSFET. The voltage drop across the source and drain of the MOSFET...
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IPC IPC(8): H02M1/36H02M1/34H02M1/08
CPCH02M1/08H02M1/34H02M1/36
Inventor 张玉超满延杰
Owner HUAWEI TECH CO LTD