Handheld device and power circuit thereof

A technology of power supply circuit and power management unit, which is applied in the direction of battery circuit device, circuit device, emergency power supply arrangement, etc., and can solve problems such as high cost and failure to start the handheld device normally

Inactive Publication Date: 2014-06-18
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the large current exceeds the maximum current allowed by the PMU, the PMU will start the undervoltage protection mode, so that the handheld device cannot be turned on normally
Therefore, it is generally necessary to use a PMU with a larger maximum current allowed to pass. Of course, the cost of the PMU with a larger maximum current allowed to pass is also higher.

Method used

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  • Handheld device and power circuit thereof

Examples

Experimental program
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Embodiment Construction

[0013] Please refer to figure 1 The preferred embodiment of the handheld device 100 of the present invention includes a power circuit 10 and a backlight driving unit 20. The power circuit 10 supplies power to the backlight driving unit 20. In this embodiment, the handheld device 100 may be a mobile phone or a personal digital assistant (PAD). The power supply circuit 10 also supplies power to other components in the handheld device 100 to maintain the normal operation of the handheld device 100.

[0014] The power supply circuit 10 includes a PMU (power management unit, power management unit) 12, a battery BAT, a comparator U, a capacitor C, two MOS transistors Q1 and Q2 as electronic switches, and six resistors R1-R6. The PMU 12 includes a first input pin I1, a second input pin I2, and an output pin IPSOUT. The first input pin I1 is used to connect to a charging device 30. The second input pin I2 is connected to the anode of the battery BAT. The negative electrode of the bat...

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PUM

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Abstract

The invention relates to a handheld device, comprising a power circuit and a backlight drive unit. The power circuit comprises a power management unit, a comparator, a first electronic switch, a second electronic switch and a battery. When the voltage of an output terminal of the second electronic switch is smaller than the voltage of the battery, the first electronic switch is conducted; the second electronic switch is cut off; and the battery supplies power to the backlight drive unit. When the voltage of the output terminal of the second electronic switch is equal to the voltage of the battery, the first electronic switch is cut off; the second electronic switch is conducted; and the battery management unit supplies power to the backlight drive unit. The handheld device can effectively prevent conditions that the power management unit enters into a low-voltage protection mode when the backlight drive unit generates large current, and further causes handheld device from normal starting, from happening. The invention provides a power supply circuit.

Description

Technical field [0001] The invention relates to a handheld device and a power circuit of the handheld device. Background technique [0002] Most handheld devices (such as mobile phones) use a PMU (power management unit, power management unit) for power supply. After the handheld device is turned on, the PMU can meet the power demand of the handheld device. However, when the handheld device is turned on, the backlight drive unit of the handheld device generates a large current. When the large current exceeds the maximum current allowed by the PMU, the PMU starts the undervoltage protection mode, so that the handheld device cannot be turned on normally. Therefore, it is generally necessary to use a PMU with a larger maximum allowable current. Of course, the cost of the PMU with a larger allowable maximum current is also higher. Summary of the invention [0003] In view of the foregoing, it is necessary to provide a power supply circuit that can prevent the power management unit f...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02J9/04H02M3/155
Inventor 周海清
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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