Multi-group output voltage-reduction conversion device having power-off protection function
A conversion device, a step-down technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as the failure of the computer system to shut down normally, the failure to shut down normally, and the timing error of the computer system.
Inactive Publication Date: 2013-03-27
DELTA ELECTRONICS INC
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Problems solved by technology
However, due to the natural characteristics of the step-down converter, the roles played by the input terminal and the output terminal will be reversed when the power is turned off, so that the original buck converter becomes a boost converter. converter, causing the output voltage that was originally input to bounce up
In this case, the abnormal output voltage will cause an error in the timing required by the computer system, making the computer system unable to shut down normally
[0003] Therefore, how to design a multi-output step-down conversion device with shutdown protection under the use of multiple output power supplies provided by the power supply. When the multi-output step-down conversion device is shut down, it can effectively eliminate The problem that the main output voltage of the multi-group output step-down conversion device bounces up and solve the situation that cannot be shut down normally is a major problem that the applicant of the present invention wants to overcome and solve.
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[0035] Relevant technical content and detailed description of the present invention, cooperate accompanying drawing to illustrate as follows:
[0036] See Figure 1A and Figure 1B , respectively are the circuit diagram of the first embodiment of the multi-output step-down conversion device with shutdown protection of the present invention and the shutdown timing diagram of the multi-output step-down conversion device of the first embodiment. The multi-output step-down conversion device includes a main step-down converter 80 and at least one auxiliary step-down converter for providing multiple sets of output power. In this embodiment, two sets of auxiliary step-down converters are taken as an example for illustration. That is, the multi-set output step-down conversion device includes a first auxiliary step-down converter 10 and a second auxiliary step-down converter 20 . The main buck converter 80 has a main output terminal Vo1 for providing a main output voltage (not shown)...
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The invention discloses a multi-group output voltage-reduction conversion device having a power-off protection function. The multi-group output voltage-reduction conversion device comprises a main voltage-reduction converter and at least one auxiliary voltage-reduction converter which are used for providing a plurality of groups of output power, and an abnormal voltage signal generation unit. When the multi-group output voltage-reduction conversion device is switched off, the abnormal voltage signal generation unit generates a control signal pair for controlling a switching element of the voltage-reduction conversion device so as to release energy stored in the auxiliary voltage-reduction converter from an internal path of the auxiliary voltage-reduction converter or a path provided by an external operating load of the auxiliary voltage-reduction converter, and prevent the stored energy from returning to the main voltage-reduction converter and raising a main output voltage.
Description
technical field [0001] The invention relates to a step-down conversion device, in particular to a multi-output step-down conversion device with shutdown protection. Background technique [0002] In the computer system application technology, due to the load requirements of the computer system, there is usually not only a single set of output. Therefore, in order to provide multiple sets of output power, the power supply usually uses a step-down converter to drop the original single set of output voltage. For the required voltage value, in order to achieve the requirements of multiple sets of output. When the power supply provides multiple sets of stable outputs and cooperates with the timing actions that meet the requirements of the motherboard, the computer system can operate normally. However, due to the natural characteristics of the step-down converter, the roles played by the input terminal and the output terminal will be reversed when the power is turned off, so that ...
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IPC IPC(8): H02M1/32
Inventor 罗正益林国荣
Owner DELTA ELECTRONICS INC