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Power detection circuit

A technology of power detection and power supply, which is applied in the direction of logic circuits, electrical components, electronic switches, etc., can solve the problems that the power detection circuit cannot be applied, and achieve the effects of reducing circuit area, suppressing deterioration, and suppressing power consumption

Inactive Publication Date: 2015-07-29
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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Experimental program
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Effect test

Embodiment approach 1

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

[0056] exist figure 1 Among them, the power supply detection circuit includes: a power supply division circuit 101 for dividing the voltage of the power supply 100; circuit 104; a high voltage side for comparing the second power division circuit output voltage 106 of the power division circuit 101, which is a higher voltage than the first power division circuit output voltage 102, with the reference voltage 103 an auxiliary comparison circuit 107; and a circuit for comparing the output voltage 108 of the third power division circuit 101 of the power division circuit 101, which is a lower voltage than the output voltage 102 of the first power division circuit, with the reference voltage 103 The low voltage side assists the comparator circuit 109 .

[0057] and, figure 1 The power supply detection circuit further has: an input switc...

Embodiment approach 2

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

[0072] exist image 3 Among them, the power supply detection circuit includes: a power supply division circuit 101 for dividing the voltage of the power supply 100; circuit 104; and a high voltage for comparing the second power supply dividing circuit output voltage 106 of the power supply dividing circuit 101, which is a high voltage compared with the first power supply dividing circuit output voltage 102, with the reference voltage 103 side auxiliary comparator circuit 107.

[0073] Moreover, the power supply detection circuit further has the function of: when the output of the high-voltage side auxiliary comparison circuit 107 is in an inactive state, the input of the detection comparison circuit 104 is changed from the reference voltage 103 to the first 1 The combination of the output voltage 102 of the power division circuit is s...

Embodiment approach 3

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

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

[0086] Moreover, the power supply detection circuit further has: when the output of the low-voltage side auxiliary comparison circuit 109 is in an active state, the input of the detection comparison circuit 104 is changed from the reference voltage 103 to the first The combination of the output voltage 102 of the power division circuit is switched to the input switching circuit 111 of t...

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Abstract

In a power detector, a comparator for detection receives an input signal and a reference voltage, and compares the input signal to the reference voltage around the switching time of active and inactive states of the output of the comparator in accordance with an output of an input switching signal generator. Except for the switching time, an input voltage for non-use of the comparator is inputs to the comparator for detection, and the differential inputs are fixed to the same potential. Therefore, aging reduction in the accuracy of power detection caused by BT degradation is effectively mitigated.

Description

technical field [0001] The invention relates to a power detection circuit which outputs a signal by detecting power. Background technique [0002] Generally, a power detection circuit that detects power based on a predetermined voltage is used, for example, as a reset signal generating circuit for an arithmetic circuit in a semiconductor integrated circuit. Generally, when the power supply voltage is below the specified voltage Vo, it is assumed that the power supply is not detected and a power supply detection signal is output to stop the arithmetic circuit. On the other hand, when the power supply voltage is higher than the specified voltage Vo, it is assumed that the power supply has When detected, a power supply detection signal is output, thereby operating an arithmetic circuit, and through these, operating a semiconductor integrated circuit. [0003] Next, the configuration of the power detection circuit will be described. [0004] power detection circuits, such as ...

Claims

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Application Information

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