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Power supply circuit, switching power supply and its control circuit and control method

A technology of power supply and control method, which is applied in the direction of control/adjustment system, instrument, electrical components, etc., and can solve the problems of increased manufacturing cost, increased manufacturing cost, and small range

Active Publication Date: 2016-01-20
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Adding a diode increases the manufacturing cost
[0006] (2) Between the time points t2' and t4', the output voltage Vo3 is still greater than the output voltage Vo2, but the amplitude is small, but it may still cause operation errors on the load circuit
[0007] (3) The forward voltage of diode D1 should be as small as possible, so choosing a diode with this very small forward voltage will increase a lot of manufacturing costs

Method used

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  • Power supply circuit, switching power supply and its control circuit and control method
  • Power supply circuit, switching power supply and its control circuit and control method
  • Power supply circuit, switching power supply and its control circuit and control method

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Embodiment Construction

[0060] see image 3 , showing the first embodiment of the present invention. This embodiment shows an application architecture utilizing the present invention, but the present invention is not limited to be applied to this architecture. Such as image 3 As shown, in the example application framework, the power supply circuit 20 is used to convert the input voltage Vin into a plurality of output voltages Vo1, Vo2, and Vo3, wherein the input voltage Vin is, for example but not limited to, 12V, and the output voltages Vo1, Vo2 and Vo3 are, for example but not limited to, 12V, 5V, and 3.3V. The power supply circuit 20 includes a filter circuit 12 , a switching power supply 24 , and a switching power supply 26 . Wherein, the filter circuit 12 converts the input voltage Vin into an output voltage Vo1 without stepping down after filtering; the switching power supply 24 and the switching power supply 26 respectively convert the input voltage Vin into output voltages Vo2 and Vo3. I...

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Abstract

The invention provides a switch-type power supply unit. An error amplifying circuit of a control circuit of the switch-type power supply unit compares a feedback signal related to an output voltage with a reference signal so as to regulate the feedback signal to the level of the reference signal through the circuit feedback equilibrium mechanism. When the switch-type power supply unit enters a shutdown program, the reference signal decreases gradually to enable the output voltage to decrease to a shutdown critical value.

Description

technical field [0001] The present invention relates to a switchable power supply and its control method, in particular to a switchable power supply which reduces the output voltage to a shutdown critical value according to the input voltage when the switchable power supply enters the shutdown program and the its control method. Background technique [0002] Figure 1A Shows the schematic diagram of the existing power supply circuit. Such as Figure 1A As shown, the power supply circuit 1 includes a filter circuit 12 and two sets of synchronous step-down switching power supplies 14 and 16, which are used to filter and convert the input voltage Vin (for example, 12V) to Vo1 (for example, 12V), respectively. Vo2 (for example, 5V), and Vo3 (for example, 3.3V). see Figure 1B , showing the signal waveforms of the input voltage Vin and the output voltages Vo1, Vo2, and Vo3 when the power supply circuit 1 enters the shutdown procedure. The so-called shutdown procedure means th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M3/158
Inventor 陈裕昌赖昌纪
Owner RICHTEK TECH