Voltage-frequency conversion circuit and blood pressure measurement apparatus provided with same

A frequency conversion circuit, voltage technology, applied in the direction of electric pulse generator circuit, diagnostic recording/measurement, logic circuit pulse generation, etc., can solve the problems of increased cost and high cost

CN102334292AActive Publication Date: 2012-01-25OMRON HEALTHCARE CO LTD
2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-01-25

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A resistor (16) is provided between an input terminal and a node (N0). A switch (15) is provided between the node (N0) and a ground voltage (GND) and closes according to the voltage level of the node (NC). A resistor (13) is provided between the nodes (N0, NA). A resistor (12) is provided between the node (NA) and one side of the input node of an NOR circuit (11A). A capacitor (14) is connected between the nodes (NA, NC). The input node of the NOR circuit (11A) is connected through the resistor (12) between the node (NA) and the ground voltage (GND). The input node of the NOR circuit (11B) is connected to the output node of the NOR circuit (11A) and to the ground voltage (GND). The input node of the NOR circuit (11C) is connected to the node (NC) and the ground voltage (GND).
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a voltage / frequency conversion circuit, in particular to an RC oscillator circuit. Background technique

[0002] Conventionally, when measuring analog quantities such as voltage, current, and electrostatic capacitance, a method of converting an analog value into a digital value (A / D conversion) has been used. There are various methods such as integral type, sequential comparison type, and ΔΣ type, and the conversion method optimal for the target analog quantity is selected. Also, ICs (Integrated Circuits) integrating these circuits have been commercialized by various companies.

[0003] However, these ICs are expensive and must be controlled by software.

[0004] In addition, if the accuracy is increased in order to perform high-precision measurement, there is a problem of increasing the corresponding cost.

[0005] In practical terms, it is the frequency that can achieve the most reliable and high-precision measurem...

Examples

Embodiment Construction

[0032] Embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code|symbol is attached|subjected to the same or equivalent part in a figure, and the description is not repeated.

[0033]

[0034] First, the appearance and structure of a blood pressure measurement device (hereinafter referred to as "sphygmomanometer") 1 according to an embodiment of the present invention will be described.

[0035] (about appearance)

[0036] use figure 1 , the sphygmomanometer 1 according to the embodiment of the present invention will be described.

[0037] refer to figure 1 , the sphygmomanometer 1 has a main body 10 and a cuff 20 that can be wound around the wrist of a person to be measured. The main body 10 is attached to a cuff 20 . On the surface of the main body unit 10 are arranged, for example, a display unit 40 made of liquid crystal or the like, and an operation unit 41 for receiving instructions from a user (typi...