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Power source detection circuit

A power detection and power supply technology, applied in logic circuits, electrical components, electronic switches, etc., can solve problems such as inability to apply power detection circuits, and achieve the effect of reducing circuit area, suppressing power consumption, and suppressing deterioration

Inactive Publication Date: 2013-02-13
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, the BT degradation countermeasure proposed in Patent Document 1 has the disadvantage that it cannot be applied to a power supply detection circuit that needs to be always in operation because it assumes that the circuit is in a non-operating state.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0055] figure 1 It is a circuit configuration diagram of the power detection circuit of this embodiment. In addition, figure 2 Is its waveform.

[0056] in figure 1 The power supply detection circuit includes: a power supply division circuit 101 for dividing the voltage of the power supply 100; a detection comparison circuit for comparing the output voltage 102 of the first power supply division circuit of the power supply division circuit 101 with the reference voltage 103 Circuit 104; a high-voltage side for comparing the second power-supply dividing circuit output voltage 106 of the power-supply dividing circuit 101, which is a higher voltage than the first power dividing circuit output voltage 102, and the reference voltage 103 Auxiliary comparison circuit 107; and for comparing the third power supply division circuit output voltage 108 of the power supply division circuit 101, which is lower than the first power supply division circuit output voltage 102, with the referen...

Embodiment approach 2

[0071] image 3 It is a circuit configuration diagram of the power detection circuit of this embodiment. In addition, Figure 4 Is its waveform.

[0072] in image 3 The power supply detection circuit includes: a power supply division circuit 101 for dividing the voltage of the power supply 100; a detection comparison circuit for comparing the output voltage 102 of the first power supply division circuit of the power supply division circuit 101 with the reference voltage 103 Circuit 104; and a high voltage for comparing the second power supply division circuit output voltage 106 of the power supply division circuit 101, which is higher than the first power supply division circuit output voltage 102, with the reference voltage 103 Side auxiliary comparison circuit 107.

[0073] In addition, the power supply detection circuit further includes: when the output of the high-voltage side auxiliary comparison circuit 107 is in an inactive state, the input of the detection comparison circ...

Embodiment approach 3

[0084] Figure 5 It is a circuit configuration diagram of the power detection circuit of this embodiment. In addition, Image 6 Is its waveform.

[0085] in Figure 5 The power supply detection circuit includes: a power supply division circuit 101 for dividing the voltage of the power supply 100; a detection comparison circuit for comparing the output voltage 102 of the first power supply division circuit of the power supply division circuit 101 with the reference voltage 103 Circuit 104; and a low voltage for comparing the second power supply division circuit output voltage 108 of the power supply division circuit 101, which is lower than the first power supply division circuit output voltage 102, with the reference voltage 103 Side auxiliary comparison circuit 109.

[0086] In addition, the power supply detection circuit further includes: when the output of the low-voltage side auxiliary comparison circuit 109 is in an active state, the input of the detection comparison circuit ...

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Abstract

In a power source detection circuit, a comparison circuit for detection (104) has inputted thereto an input signal (102) and a reference signal (103) by an input switching signal generating circuit (112) in order to compare both the input signal and the reference signal at nearly the switching time between the active mode and the inactive mode of the output. Meanwhile, the input voltage of comparison circuit when not in use (110) is inputted into the comparison circuit for detection (104) except at nearly the switching time, and the differential inputs are fixed to the same potential. Thus, the degradation over time of power source detection accuracy caused by BT degradation is effectively suppressed.

Description

Technical field [0001] The present invention relates to a power detection circuit that outputs a signal by detecting power. Background technique [0002] Generally, a power supply detection circuit that detects a power supply based on a predetermined voltage determined in advance is used as, for example, a reset signal generating circuit for an arithmetic circuit in a semiconductor integrated circuit. Generally, when the power supply voltage is below the predetermined voltage Vo, it is assumed that the power supply is not detected and the power supply detection signal is output, thereby stopping the arithmetic circuit. On the other hand, when the power supply voltage is higher than the predetermined voltage Vo, the power supply is set After being detected, the power supply detection signal is output, thereby operating the arithmetic circuit, and operating the semiconductor integrated circuit through these. [0003] Next, the configuration of the power detection circuit will be des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/00H03K17/14H03K17/30H03K17/687H03K19/0944
CPCH03K17/145H03K99/00H03K17/223
Inventor 近藤和広田中胜彦
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD