Soft-start circuit and method for DC high-power power supply
A soft-start circuit and high-power technology, which is applied in battery circuit devices, electric vehicles, circuit devices, etc., can solve problems such as high temperature and sparks, large current surges, and quantitative control of power-on parameters of difficult circuits, so as to prevent damage effect
Active Publication Date: 2021-11-26
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology
[0003] However, when the power supply circuit is powered on, it is easy to generate large current surges, high temperatures and sparks instantaneously, posing threats to terminal blocks, equipment and personal safety
[0004] It is difficult to quantitatively control the power-on parameters of the circuit in the traditional soft-start circuit. While realizing soft-start, it can fully protect the power-on circuit itself
Method used
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[0021] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] The DC high-power power supply soft-start circuit of the present invention, such as figure 1 As shown, it includes an isolated DC-DC circuit, a constant current circuit, a full judgment module and a switch lock circuit. When powered on, the isolated DC-DC circuit generates an isolated DC voltage, which controls the constant current circuit to charge the rear end with a constant current; the full judging module identifies whether it is full, and when it is fully charged, the switch is turned on to lock the module, and the input power and The post-stage power supply is directly connected. At this point, the soft start power-on function is completed.
[0023] Such as figure 2 Shown is the change graph of power-on voltage V. at t 0 Power on at any time, at this time the constant current module starts to charge the rea...
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The invention discloses a DC high-power power supply soft-start circuit and method, comprising an isolated DC-DC circuit, a constant-current charging circuit, a full-fill judging module and a switch locking circuit. When powering on, the isolated DC voltage is generated by DC‑DC, which controls the constant current circuit to charge the rear end with constant current; the full judgment module identifies whether it is full, and when it is fully charged, the switch is turned on to lock the module, and the input power and the rear end The power supply is connected directly. At this point, the soft start power-on function is completed. Compared with the existing technology, this method uses the power tube protection circuit to realize the constant current charging of the back-end circuit. On the one hand, the charging parameters can be adjusted, and on the other hand, the power tube can be effectively protected to prevent excessive current under high voltage from causing Damage; the circuit turns on the switch lock function after the rear end is fully charged, and will not generate a transient high current impact at the moment of the switch.
Description
technical field [0001] The invention relates to a soft start circuit, in particular to a soft start circuit and method for a DC high-power power supply. Background technique [0002] In high-power amplifiers, many large-capacity capacitors are often installed on the power supply near the power tube. On the one hand, this can reduce the internal resistance of the power supply, reduce the power supply ripple, and stabilize the power supply voltage. On the other hand, it can also provide sufficient energy for the power tube to ensure dynamics. [0003] However, when the power supply circuit is powered on, it is easy to generate large current surges, high temperatures and sparks instantaneously, posing threats to terminal blocks, equipment and personal safety. [0004] Traditional soft-start circuits are difficult to quantitatively control the power-on parameters of the circuit. While realizing soft-start, the power-on circuit itself is fully protected. Contents of the invent...
Claims
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IPC IPC(8): H02M1/36H02M1/32H02J7/00
CPCH02M1/36H02M1/32H02J7/00712Y02B70/10
Inventor 何呈王彪芮超群朱柏宇
Owner JIANGSU UNIV OF SCI & TECH