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Step-down circuit and electronic equipment

A technology of step-down circuits and sub-circuits, applied in the field of electronics, can solve the problems of slow system response rate, automatic system shutdown, difficulty in supplying voltage for step-down circuits, etc., and achieve the effect of preventing high energy storage.

Active Publication Date: 2019-02-05
LENOVO (BEIJING) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There is a battery in the electronic device, and the power supply is powered on. Considering the impedance of the power supply line, the final input voltage to the system may be lower than the power supply voltage required by the system. This phenomenon may cause the system to automatically shut down
[0003] In the prior art, in order to solve the above problems, the minimum protection voltage of the battery will be increased, but in this case, when the battery power is low, the operating frequency of the system needs to be reduced to reduce the operating current, so as to ensure the voltage input to the system To meet the power supply voltage value required by the system, obviously this will lead to the sacrifice of system performance, such as the slowing down of the system response rate, etc.; and the step-down circuit in the prior art is difficult to provide a stable power supply voltage

Method used

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  • Step-down circuit and electronic equipment
  • Step-down circuit and electronic equipment
  • Step-down circuit and electronic equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, this embodiment provides a step-down circuit, including:

[0038] A comparison sub-circuit 110, configured to compare the input first voltage with a first preset voltage and output a comparison signal;

[0039] The first controlled switch 120 includes a control terminal, an input terminal, and an output terminal; the control terminal is connected to the output terminal of the comparison subcircuit, and is used to turn on or off the input terminal and the output terminal according to the comparison signal. a first connection between the output terminals; the first connection is connected to an input point of the first voltage;

[0040] The controller 130 is connected to the output terminal of the comparison sub-circuit 110, and is used to control the turn-on and turn-off of the second controlled switch 140 and the third controlled switch 150 according to the comparison signal; wherein, the second The input end of the controlled switch 140 is ...

Embodiment 2

[0050] Such as figure 1 As shown, this embodiment provides a step-down circuit, including:

[0051] A comparison sub-circuit 110, configured to compare the input first voltage with a first preset voltage and output a comparison signal;

[0052] The first controlled switch 120 includes a control terminal, an input terminal, and an output terminal; the control terminal is connected to the output terminal of the comparison subcircuit, and is used to turn on or off the input terminal and the output terminal according to the comparison signal. a first connection between the output terminals; the first connection is connected to an input point of the first voltage;

[0053] The controller 130 is connected to the output terminal of the comparison sub-circuit 110, and is used to control the turn-on and turn-off of the second controlled switch 140 and the third controlled switch 150 according to the comparison signal; wherein, the second The input end of the controlled switch 140 is ...

Embodiment 3

[0063] Such as figure 1 As shown, this embodiment provides a step-down circuit, including:

[0064] A comparison sub-circuit 110, configured to compare the input first voltage with a first preset voltage and output a comparison signal;

[0065] The first controlled switch 120 includes a control terminal, an input terminal, and an output terminal; the control terminal is connected to the output terminal of the comparison subcircuit, and is used to turn on or off the input terminal and the output terminal according to the comparison signal. a first connection between the output terminals; the first connection is connected to an input point of the first voltage;

[0066] The controller 130 is connected to the output terminal of the comparison sub-circuit 110, and is used to control the turn-on and turn-off of the second controlled switch 140 and the third controlled switch 150 according to the comparison signal; wherein, the second The input end of the controlled switch 140 is ...

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PUM

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Abstract

The embodiment of the invention provides a voltage-reduced circuit and an electronic device. The voltage-reduced circuit comprises: a comparison sub circuit configured to compare the inputted first voltage with a first presetting voltage and output comparison signals; a first controlled switch consisting of a control end, an input end and an output end, the control end being connected with the output end of the comparison sub circuit and being configured to conduct or disconnect the first connection between the input end and the output end, the first connection being connected with the input point of the first voltage; a controller configured to connect with the output end of the comparison sub circuit and control the conduction and disconnection of a second controlled switch and a third controlled switch according to the comparison signals, the input end of the second controlled switch being connected with the input point of the first voltage, the output end of the third controlled switched being connected with a voltage-reduced point; and an energy storage element configured to connect with the output end of the first controlled switch, the output end of the second controlled switch and the input end of the third controlled switch and receive the current generated by the first voltage effect from the output end of the first controlled switch and the second controlled switch, or perform discharging the voltage-reduced point through the third controlled switch.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a step-down circuit and electronic equipment. Background technique [0002] There is a battery in the electronic device, and the power supply is powered on. Considering the impedance of the power supply line, the final input voltage to the system may be lower than the power supply voltage required by the system. This phenomenon may cause the system to automatically shut down. [0003] In the prior art, in order to solve the above problems, the minimum protection voltage of the battery will be increased, but in this case, when the battery power is low, the operating frequency of the system needs to be reduced to reduce the operating current, so as to ensure the voltage input to the system Satisfying the power supply voltage value required by the system will obviously lead to the sacrifice of system performance, such as slowing down of the system response rate; and the step-dow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08
CPCH02M1/08
Inventor 莫志坚肖启华
Owner LENOVO (BEIJING) LTD