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Power supply restarting method and circuit

A power restart and circuit technology, applied in the power supply field, can solve the problems of high restart power consumption, repeated action of the power tube, prolonging the duration of the power tube, etc. The effect of restarts

Pending Publication Date: 2018-08-21
SHAANXI REACTOR MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, in order to overcome the shortcomings of repeated actions of the power tube and high power consumption when the power is restarted in the prior art, the present invention increases the time used for each restart by setting a threshold, and prolongs the duration of the power tube being in the non-working state , so as to reduce the number of power restarts, reduce restart power consumption and reduce the value of external capacitors

Method used

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  • Power supply restarting method and circuit
  • Power supply restarting method and circuit
  • Power supply restarting method and circuit

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Embodiment Construction

[0024] Below in conjunction with specific embodiment and attached Figure 1-4 Provide a specific description of the present disclosure;

[0025] The invention provides a power restart method, the principle of which is as follows: figure 2 As shown, set two voltage thresholds——Vth1 and Vth2, where the two voltage thresholds, the turn-on voltage Uvlo_off and the undervoltage protection voltage Uvlo_on satisfy Uvlo_off>Vth1>Vth2>Uvlo_on; in a restart, in the original restart period An extended period Treset is added; in the extended period, the sampling voltage V1 is set to be kept between Vth1 and Vth2, and the enable signal EN remains invalid, thereby prolonging each restart time, reducing the number of restarts and reducing power consumption.

[0026] In a specific embodiment, when the sampling voltage V1 rises to the threshold Vth1 for the first time, the increase of the extended period Treset starts.

[0027] Further, the extended period Treset is N cycles, where N is a p...

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Abstract

The invention relates to a power supply restarting method and a circuit. By setting a threshold value, Vcc voltage is maintained within a certain value range, so that the time for restarting a power supply each time is prolonged, correspondingly the frequency of restarting the power supply is decreased, the duration of a power tube in a non-operating state is prolonged, and the restarting power consumption and the value of an external capacitor are effectively decreased.

Description

technical field [0001] The invention belongs to the field of power supplies, in particular to a method and circuit for restarting a power supply. technical background [0002] In the control circuit or control circuit chip, the circuit may be restarted due to various reasons, so it will have a restart function when designing the circuit or chip. For example, in the circuit design of switching power supply, when the sampling voltage V1 of the power supply Vcc drops to under When the protection voltage Uvlo_on is lowered, the power supply is recharged to the turn-on voltage Uvlo_off, and the enable signal EN is output to complete a restart. [0003] figure 1 It is the sequence diagram when the power supply is restarted in the prior art: in the time period t11, when the V1 voltage is lower than the turn-on voltage Uvlo_off, the power supply enters the protection state, the external capacitor is discharged, and the Vcc voltage drops. At this time, the enable terminal is valid a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 杨世红熊平
Owner SHAANXI REACTOR MICROELECTRONICS
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