JPH0518502U - Power control circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] With a simple configuration, it is possible to prevent the memory contents from being erased when the battery is replaced, and to prevent the clock from going wrong. [Structure] A switch that turns on and off when the battery cover is attached or detached is provided. When this switch is turned off, the power control unit 42
Disables operations other than memory and calendar clock / timer calendar clock functions.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply control circuit that controls the supply of power to each part in a device such as a blood pressure monitor that uses a battery as a power supply.

[0002]

[Prior Art]

 For devices that have a built-in memory such as a sphygmomanometer or a clock, as shown in the Japanese Utility Model Publication No. Sho 63-77010, a memory with a backup ( A RAM is provided, and at least the memory contents necessary for battery replacement are stored in a backup memory to prevent the memory contents from being erased, and the clock can be operated even when the battery is replaced. There are some that I did.

[0003]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional example, there is a problem that a memory and a battery for backing up this memory and the like are required, the configuration is complicated, and the cost is high. The present invention has been made in view of the above-mentioned points, and an object thereof is a power supply control which has a simple structure and can prevent the contents stored in the memory from being erased when the battery is replaced and prevent the clock from being out of order. To provide a circuit.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention requires a battery replacement detection means for detecting that the battery is replaced, and a minimum requirement such as a memory and a clock when the output of the battery replacement detection means is obtained. And a power supply control means for supplying power only to such circuits.

[0005]

[Action]

 Since the present invention has the above-mentioned configuration, only the minimum necessary circuit section can be operated at the time of battery replacement, and it is possible to prevent the memory contents from being erased and prevent the clock from going wrong even with a backup capacitor, for example. In this way, the structure is not complicated and the cost can be reduced.

[0006]

【Example】

 1 to 6 show an embodiment of the present invention. In the present embodiment, the present invention will be described by taking a blood pressure monitor as an example. As shown in FIG. 5, the sphygmomanometer measures the blood pressure by winding a cuff 6 connected to the sphygmomanometer main body 1 through an intake / exhaust pipe 5 around a blood pressure measurement site such as the upper arm. It is equipped with a display 4 that displays various types of information and a printer 3 that prints the measurement results.

In the sphygmomanometer of the present embodiment, the display unit 4 displays digital numbers of blood pressure values, level display of pressure values, WHO classification display of blood pressure values, various Japanese cautions, instruction displays, various unit displays. You can also display the dead battery. On the upper surface of the sphygmomanometer main body 1, a power switch SW ₁ , a start switch SW _{2 for} starting measurement, a previous measurement value and an average value between the previous time and this time are displayed on the display unit 4 Previous / average switch SW ₃ , memory switch SW ₄ that is operated to store the required data, pressurization value switching switch SW ₅ that sets the pressurization value at the start of measurement of the strip 6, measurement results, etc. on the printer 3. Various switches such as a print switch SW _{6 for} printing and a print selection switch SW ₇ for switching a printing method are provided.

This sphygmomanometer is provided with an openable / closable lid 2 attached to the sphygmomanometer body 1, and when the lid 2 is closed when not in use, the upper surface of the sphygmomanometer body 1 can be covered. It A storage recess 7 is provided on the lid 2 side of the sphygmomanometer main body 1, and the strip 6 and the intake / exhaust pipe 5 can be stored in the storage recess 7. On the back side of the sphygmomanometer body 1 is formed a battery housing 9 for housing a plurality of batteries 8 as shown in FIG. 6B, and the opening surface of the battery housing 9 is detachable. A battery cover 10 is attached. That is, this blood pressure monitor uses the battery 8 as a power source. However, by using the AC adapter 11 shown in FIG. 6 (c), it can also be used as a commercial power source.

As shown in FIG. 6 (a), the pressurizing pump 12 for sending air into the strip 6 is arranged in a portion facing the storage recess 7 for accommodating the strip 6, and the pressurizing pump 12 The air pipe 15 from is connected to the intake / exhaust pipe 5 via the insertion port 16. The pressurizing pump 12 is connected to a rapid exhaust pipe 17 and a constant velocity exhaust valve 14 through a branch pipe 13, and gradually exhausts the air in the strip 6 through the constant velocity exhaust valve 14 at the time of blood pressure measurement. The air in the strip 6 is rapidly exhausted from the rapid exhaust valve 17 at the end of the operation.

A printed circuit board 18 on which a circuit section described later is mounted is arranged on these members. It should be noted that the various switches SW described above are provided on the printed circuit board 18.₁~ SW₇ In addition to the date and time setting switch SW₈Change switch SW for changing the timer time etc. ₉ , Paper feed switch SW_TenEtc. are also mounted, and a pressure detector 19 composed of a semiconductor pressure sensor for detecting the pressurization state of the strip 6 is also mounted.

As shown in FIGS. 1 and 2, the circuit of this embodiment is an A / D converter circuit for A / D converting the output of the pressure detector 19 for detecting the pressurization state of the strip 6. From the output of the part 21, the pressurizing pump drive circuit part 22 that drives the pressurizing pump 12, the quick exhaust valve drive circuit part 23 that drives the quick exhaust valve 17, and the output of the A / D converter circuit part 21 A power supply for each part is created from the power supplied from the battery 8 and the control circuit part 24 consisting of a microcomputer that performs various judgment operations such as judgment of the minimum blood pressure and controls the operation of the drive circuits 22 and 23. And a power supply circuit section 27 that supplies the power.

In the case of the present embodiment, since the semiconductor pressure sensor 19a is used as the pressure detector 19, a constant current generating circuit 25a for supplying a constant current to the pressure sensor 19a is provided. The constant current generating circuit 25 constitutes a pressure detecting circuit section 25. Here, the pressure sensor 19a generates a DC voltage proportional to the pressure.

Further, the A / D converter circuit unit 21 includes a differential amplifier circuit 21a that performs amplification adjustment of the output voltage of the pressure sensor 19a, and an A / D converter 21b that converts this differential amplified output into a digital value. It is composed of. The pressurizing pump 12 comprises a pump 12a and a motor 12b for driving the pump 12a. The pressurizing pump drive circuit section 22 for controlling the drive of the motor 12b is composed of a transistor switch circuit 22a. The exhaust valve 17 is composed of an air valve 17a and an electromagnet 17b for controlling the opening / closing of the air valve 17a, and the quick exhaust valve drive circuit section 23 is composed of a transistor switch circuit 23a.

The power supply circuit unit 27 boosts the voltage of the battery 8 by a DC-DC converter and, at the same time, makes it a constant voltage by a regulator and supplies it to each unit, and according to the operating state of the power switch SW _1. It is composed of an "on / off" circuit 27b for controlling the supply of the voltage of the battery 8 to the power supply circuit 27a. The control circuit unit 24 counts and converts the number of pulses into a pressure value, a counting / converting unit 31, a pulse wave extracting unit 32 that extracts a pulse wave component from the output of the counting / converting unit 31, and a pulse interval A pulse interval extraction unit 33 that performs extraction, an absolute pressure extraction unit 34 that extracts an absolute pressure component from the output of the counting / converting unit 31, and a calendar clock / timer 35 that measures the date and time and counts a fixed time. , Automatic measurement control unit 36 that performs arithmetic processing for automatic measurement, storage of measurement date and time (including month), determination processing of systolic blood pressure and diastolic blood pressure and storage of the determination result, determination of pulse rate and the determination result Determination / storing unit 37 for storing the data, a printer control unit 38 for controlling the printer 3 via the printer drive circuit unit 28, a display control unit 39 for controlling the display of the display unit 4, and a monitor sound from the buzzer 26. Emits a caution sound A signal generating section 40 for, are constituted by an A / D converter control unit 4 1 provide control signals for generating a gate period Me other measured in A / D converter 21b.

The control circuit section 24 of this embodiment is composed of a one-chip microcomputer 24a and a memory 24b, as shown in FIG. Further, the display control unit 39 includes a character display unit 39a for performing display control necessary for automatic measurement, a pressure display unit 39b for controlling display of pressure data related to maximum and minimum blood pressures, and pulse data related display. It is composed of a pulse display unit 39c for controlling and a display switching unit 39d for switching and outputting the outputs of these respective display units 39a to 39c. Thus, for example, pressing the previous / average switch SW ₃ once displays the previous measured value, and pressing it twice displays the previous and current average values. Further, the monitor sound emitted from the buzzer 26 is output in synchronization with the pulse wave, and the caution sound is emitted at the end of measurement or exhaustion completion at the time of abnormality determination. By the way, in the present embodiment, in addition to the above configuration, a battery replacement detection unit 43 that detects that the battery 8 is replaced, and when the output of the battery replacement detection unit 43 is obtained, It is provided with a power supply control means for supplying power only to circuits that require a limit.

In this embodiment, as the battery replacement detection unit 43, a switch S ₁ shown in FIG. 3 which is turned on / off by attaching / detaching the battery cover 10 is used. 4A shows a state in which the battery cover 10 is attached to the battery housing portion 9, and FIG. 4B shows a state in which the battery cover 10 is removed from the battery housing portion 9. That is, since the battery cover 10 is always removed when the battery 8 is replaced, it is possible to detect that the battery 8 is replaced by detecting this.

Note that the battery replacement detection unit 43 does not necessarily have to have the above-described configuration. For example, it is necessary to provide a fixing member for fixing the battery 8 and remove the fixing member when replacing the battery 8. If so, it is possible to detect that the battery 8 is replaced in the same manner as in the above case. When the output of the battery replacement detection unit 43 is obtained, a power supply control unit that supplies power only to the memory 24b and the clock (calendar clock / counter 35) is connected to the power control unit 42 of the control circuit unit 24. The function is performed by the backup capacitor C ₁ provided in the power supply circuit section 27 shown in FIG.

That is, in the present embodiment, when the output of the battery replacement detection unit 43 is obtained, the power supply control circuit 42 performs operation control so that only the memory 24b and the calendar clock function of the calendar clock / counter 35 are activated. To do. By doing so, the power consumption when replacing the battery can be extremely reduced, and the power can be continuously supplied for a comparatively long time only by the backup capacitor C ₁ . Therefore, the stored contents of the memory 24b will not be erased and the clock will not go wrong. Moreover, since only the backup capacitor C _{1 is} added to the structure originally provided as a sphygmomanometer, the structure is not complicated and the cost can be reduced.

In the above-mentioned case, the control circuit section 24 so far adopted the method of performing the operation stop control by software, but in the power supply circuit section 27, only the one-chip microcomputer 24a and the memory 24b are used. The first power supply path for supplying power to the first power supply path and the second power supply path for supplying power to other components are separated, and the first power supply path is output when the output of the battery replacement detection unit 43 is obtained. A hard method of supplying power only from the supply path may be adopted.

[0020]

[Effect of the device]

 As described above, the present invention includes only the battery replacement detection means for detecting the replacement of the battery and the minimum necessary circuit such as a memory or a clock when the output of the battery replacement detection means is obtained. Since it is equipped with a power supply control means that supplies power, only the minimum necessary circuit section can be operated when replacing the battery, and for example, even with a backup capacitor, it is possible to prevent the memory contents from being erased and to prevent the clock from going wrong. It is possible to prevent it, and since it does not require a battery for backup, a memory for temporary storage, etc., it has an advantage that the configuration is not complicated and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention.

FIG. 2 is a specific circuit diagram of the above.

FIG. 3 is an explanatory diagram showing a specific configuration of a battery replacement detection unit.

FIG. 4 is an explanatory diagram of a battery replacement detection operation.

FIG. 5 is a perspective view showing an appearance of a sphygmomanometer.

6A to 6C are a plan view with a part of the sphygmomanometer broken, a cross-sectional view, and a perspective view showing an AC adapter used therein.

[Explanation of symbols]

42 Power supply control unit 43 Battery replacement detection unit S ₁ switch C ₁ capacitor

Claims (1)

[Scope of utility model registration request] 1. A battery replacement detecting means for detecting replacement of a battery, and when the output of the battery replacement detecting means is obtained, power is supplied only to a minimum necessary circuit such as a memory or a clock. A power supply control circuit comprising a power supply control means.