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Soft starting device

A soft start and transistor technology, which is applied in the direction of output power conversion devices, instruments, and adjustment of electrical variables, etc., can solve the problem of difficult control of the switching time point

Active Publication Date: 2009-09-02
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The soft start device proposed by the present invention adopts a soft switching circuit as the switching mechanism between the open loop and the closed loop mentioned in the prior art, and solves the problem that the switching time point is not easy to control in the traditional technology, so that the switching process Smooth and no surge

Method used

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Embodiment Construction

[0057] refer to Figure 2A , which is a schematic diagram of the first embodiment of the soft start device, including a current source 100, a first transistor 110, a second transistor 120, a first resistor 111, a second resistor 121, a third resistor 112, and a fourth resistor 124 , the first comparator 113 , the second comparator 125 , the first capacitor 122 and the reset switch 123 , their interconnection relationship is shown in the figure.

[0058]The working mode of this embodiment is that after the soft start, the first voltage controlling the first transistor 110 will gradually increase from the initial voltage value (relative zero voltage value), and the initial voltage value is smaller than the voltage value used to control the second transistor 120 (that is, the voltage value of the fixed bias voltage), but as the voltage value of the first voltage gradually increases, it will eventually be greater than the voltage value of the fixed bias voltage. Since the first t...

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Abstract

The invention discloses a soft starting device, which comprises a current source, a first transistor and a second transistor; wherein the first transistor is coupled with the current source and decides the conducted current magnitude of the first transistor according to a voltage, and the second transistor is also coupled with the current source and decides the conducted current magnitude of the second transistor according to a fixed bias voltage; wherein an initial voltage value of the initial voltage is less than the voltage value of the fixed bias voltage, but after the soft starting, the voltage value of the first voltage increases gradually until larger than the voltage value of the fixed bias voltage, thus leading the soft starting to be implemented smoothly.

Description

technical field [0001] The invention relates to a soft start device, in particular to a soft start device which has a smooth switching process without surge and can prolong the start time at the same time. Background technique [0002] Soft-start devices (soft-start) can be applied to a variety of circuits. In order to avoid damage to the circuit due to excessive inrush current or overshoot voltage at the initial stage of power on, and the circuit that requires the input power to rise slowly, a soft start device can be used. [0003] Take the switching regulator as an example for illustration. Switching regulators have better voltage conversion efficiency, so they are usually used to convert large dropout voltages and large load currents. However, the switching regulator may easily cause excessive inrush current or excessive voltage at the initial stage of power startup, which may cause damage to the circuit. Therefore, when starting up the power supply, it is necessary t...

Claims

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Application Information

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IPC IPC(8): H03K17/28H03K17/284H02M1/36G05F1/12
Inventor 李朝政王伟州
Owner REALTEK SEMICON CORP
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