JP2020038139A - Control circuit, device, and battery voltage drop confirmation method by control circuit - Google Patents

Abstract

To provide a control circuit, a device, and a battery voltage drop confirmation method by the control circuit capable of detecting a voltage drop abnormality because of internal resistance of a battery by simple structure.SOLUTION: A control circuit 1 includes: a storage part 10 for previously storing a relationship between an allowable voltage drop ΔVt permissible as a voltage drop by internal resistance (r) of a battery B usable for driving a load, and an open voltage Vin1 of the battery B in an unloaded state; a calculation part 22 for calculating a difference between the open voltage Vin1 and a terminal voltage Vin2 of the battery B in a loaded state as an actual voltage drop ΔVn; a comparison part 23 for comparing the actual voltage drop ΔVn in the open voltage Vin1 calculated by the calculation part 22 with the allowable voltage drop ΔVt in the open voltage Vin1 stored in the storage part 10; and a warning part 24 for outputting a warning signal when the actual voltage drop ΔVn exceeds the allowable voltage drop ΔVt as a result of comparison of the comparison part 23.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a control circuit, an apparatus, and a method for checking a battery voltage drop by the control circuit.

  2. Description of the Related Art A control circuit that controls driving of an electromagnetic valve, a pump, and the like using a primary battery such as an alkaline dry battery as a power supply and an apparatus including the control circuit are known. In this device, when the battery voltage drops below a predetermined value due to the consumption of the battery, an alarm may be issued.

When the alkaline dry battery or the like is consumed, the internal resistance of the battery may increase even if the electromotive force is constant. The internal resistance of the battery is not specified in the specifications and varies depending on the manufacturer and type. If the current consumption of the device is large, the voltage drop increases due to the internal resistance of the battery and the load of the solenoid valve, pump, and the like. If the voltage becomes lower than the operating voltage of the device due to the voltage drop, the control circuit for controlling the driving of the load may operate abnormally.
To avoid abnormal operation, it is conceivable to increase the setting for sensing the decrease in battery voltage. However, this shortens the product life per battery and requires frequent battery replacement.

Therefore, it is known to detect a drop in battery voltage by focusing on the internal resistance of the battery (for example, Patent Document 1).
In the device of Patent Document 1, a step of measuring the internal resistance of the battery, a step of multiplying the measured internal resistance by a preset lower limit current to calculate a voltage drop of the battery due to the internal resistance, Obtaining a lower limit open voltage value of the battery capacity, creating a relation table between the open voltage value and the battery charge state, and obtaining the lower limit value based on the relation table between the open voltage value and the battery charge state. The step and the step of obtaining the battery health state value by the relational expression between the battery charge state and the lower limit value of the battery charge state make it possible to estimate the battery health state based on the internal resistance of the battery.

JP 2015-197435 A

However, in the device of Patent Literature 1, it is necessary to measure the internal resistance of the battery itself in order to estimate the health of the battery. Therefore, a mechanism for measurement is required, and the structure of the device is complicated. There is.
An object of the present invention is to provide a control circuit, a device, and a battery voltage drop confirming method using the control circuit, which can detect a voltage drop abnormality caused by the internal resistance of the battery with a simple structure.

  The control circuit of the present invention provides a relationship between an allowable voltage drop ΔVt that can be allowed as a voltage drop due to an internal resistance of a battery that can be used to drive a load, and an open-circuit voltage Vin1 of the battery in a state where the load is not applied. A storage unit that stores the open voltage Vin1 and the terminal voltage Vin2 of the battery in a state where the load is applied, as a real voltage drop ΔVn, and a calculation unit that calculates the difference. A comparison unit that compares the actual voltage drop ΔVn at the open voltage Vin1 with the allowable voltage drop ΔVt at the open voltage Vin1 stored in the storage unit, and as a result of comparison by the comparison unit, the actual voltage drop ΔVn An alarm unit that outputs an alarm signal when the voltage drop exceeds the voltage drop ΔVt.

In the present invention, a load means a device that requires a large drive current.
In the present invention, a permissible voltage drop ΔVt that is permissible as a voltage drop due to the internal resistance of the battery is tabulated for each open voltage Vin1 and stored in the storage unit in advance. In the calculation unit, the open voltage Vin1 in a state where no load is applied to the battery actually used, that is, a state where the drive current is not supplied to the load, and a state where the load is applied, that is, the drive current is applied to the load. The difference from the supplied terminal voltage Vin2 is calculated as the actual voltage drop ΔVn. This actual voltage drop ΔVn is a voltage drop due to the actual internal resistance of the battery. The comparing unit compares the allowable voltage drop ΔVt at the open circuit voltage Vin1 with the actual voltage drop ΔVn based on the data from the storage unit and the data from the calculating unit. As a result, if ΔVt <ΔVn, the alarm unit Outputs an alarm signal. That is, when the actual voltage drop ΔVn is larger than the allowable voltage drop ΔVt, it is determined that the internal resistance of the battery has increased, and an alarm signal is output. As a result, abnormal operation of the control circuit due to an increase in the internal resistance of the battery can be avoided.
As described above, according to the present invention, it is not necessary to directly measure the internal resistance of the battery itself, and therefore, it is possible to detect a voltage drop abnormality due to the internal resistance of the battery with a simple structure.

In the control circuit of the present invention, the battery is preferably a primary battery.
In this configuration, since the battery is a primary battery such as a dry battery, it can be easily obtained. Therefore, when an alarm signal is output from the alarm unit as the internal resistance of the battery increases, the battery can be easily replaced.

An apparatus of the present invention includes the above-described control circuit, the load, and a case accommodating the control circuit, the load, and the battery.
According to the present invention, the same effects as described above can be obtained.

In the device of the present invention, it is preferable that the device includes an electromagnetic valve, and the load is the electromagnetic valve.
In this configuration, the difference between the terminal voltage Vin2 and the open-circuit voltage Vin1 when the solenoid valve is driven as a load is calculated as the actual voltage drop ΔVn. Here, since the drive voltage and the drive current when the solenoid valve is driven are stable, the measurement error of the terminal voltage Vin2 of the battery can be reduced. Therefore, abnormal operation due to an increase in the internal resistance of the battery can be reliably avoided.

The device of the present invention includes an elastic balloon having a restoring force, a flow path connected to the elastic balloon having the restoring force, and a pump for supplying air to the flow path, wherein the load is the pump. Is preferred.
In this configuration, the control circuit described above can be applied to a device having an elastic balloon, a flow path, and a pump, for example, a tongue pressure measuring device. Therefore, during the measurement of the tongue pressure, the occurrence of an abnormal operation due to an increase in the internal resistance of the battery prevents the measured value from showing an abnormal value or preventing the tongue pressure measurement from being stopped. it can.

The apparatus of the present invention includes a tank and a pressurizing pump that supplies a fluid to the tank,
Preferably, the load is the pressure pump.
With this configuration, the above-described control circuit can be applied to a device having a tank and a pressurizing pump, for example, a pressure generating device. Therefore, it is possible to prevent the occurrence of a pressure different from the set pressure value due to the occurrence of the abnormal operation due to the increase in the internal resistance of the battery.

The battery voltage drop confirming method by the control circuit of the present invention includes an allowable voltage drop ΔVt allowable as a voltage drop due to an internal resistance of a battery that can be used to drive a load, and a voltage drop of the battery in a state where the load is not applied. Storing in advance the relationship with the open-circuit voltage Vin1, and calculating the difference between the open-circuit voltage Vin1 and the terminal voltage Vin2 of the battery under a load as an actual voltage drop ΔVn. Comparing the actual voltage drop ΔVn at the open circuit voltage Vin1 with the stored allowable voltage drop ΔVt at the open circuit voltage Vin1, and as a result of the comparison, when the actual voltage drop ΔVn exceeds the allowable voltage drop ΔVt. Outputting an alarm signal.
According to the present invention, the same effects as described above can be obtained.

FIG. 1 is a schematic diagram showing a tongue pressure measuring device according to a first embodiment of the present invention. FIG. 2 is a block diagram schematically showing an apparatus main body of the embodiment. The block diagram which shows the outline of the circuit structure of the gate valve of the said embodiment. 9 is a flowchart illustrating a process for confirming a decrease in battery voltage due to an increase in internal resistance. The figure which shows the relationship between allowable voltage drop (DELTA) Vt and open circuit voltage Vin1. FIG. 6 is a block diagram schematically showing a pressure generating device according to a second embodiment of the present invention.

[First Embodiment]
A first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a tongue pressure measuring device 100 of the present embodiment. The tongue pressure measuring device 100 is a device that can be driven by a battery, and is an example of the device of the present invention.
In FIG. 1, a tongue pressure measuring device 100 is a device for measuring a tongue pressure of a user, and includes a device main body 110 and an elastic balloon 120.
The elastic balloon 120 includes a balloon main body 121 and a tube 122. The balloon main body 121 has a restoring force, and can be inserted into the oral cavity. The tube 122 has a distal end connected to the balloon main body 121 and a proximal end connected to the apparatus main body 110 so that air discharged from the apparatus main body 110 can be introduced into the balloon main body 121.
The tongue pressure measuring device 100 is also used as a tongue pressure strengthening training device.

[Apparatus body]
FIG. 2 is a block diagram schematically showing the main body 110 of the apparatus.
1 and 2, the apparatus main body 110 includes a case 111, a display unit 112, an operation unit 113, a buzzer 114, a pressure sensor 115, a pump 116, a gate valve 117, an exhaust valve 118, and air. A flow path 119, a control circuit 1, and a drive circuit 30 are provided.

The case 111 is formed in a box shape. In the case 111, the display unit 112, the operation unit 113, the buzzer 114, the pressure sensor 115, the pump 116, the gate valve 117, the exhaust valve 118, the air flow path 119, the control circuit 1 and the like are housed, and in addition to these. A battery B that can be used to supply power is stored. In this embodiment, two dry batteries, which are temporary batteries, are stored as the batteries B.
In the case 111, the pressure sensor 115, the pump 116, the gate valve 117, and the exhaust valve 118 are connected by an air passage 119, and one end 119 A of the air passage 119 is connected to the tube 122. That is, the air passage 119 and the tube 122 constitute the passage of the present invention. The other end 119 </ b> B of the air passage 119 is open to the outside of the case 111.

The pressure sensor 115 is a pressure sensor that detects a change in air pressure due to deformation of the balloon main body 121 in a tongue pressure measuring step of measuring the tongue pressure of the user.
The pump 116 is connected to the balloon main body 121 via a tube 122 and an air flow path 119, and pressurizes the balloon main body 121 by supplying air to the tube 122 and the air flow path 119.

  The gate valve 117 is an electromagnetic valve for opening and closing the connection between the pump 116 and the balloon body 121. In the present embodiment, in the tongue pressure measurement step, the gate valve 117 is opened when the pump 116 is driven. Thereafter, the pump 116 is stopped, and the balloon body 121 is inserted into the oral cavity to reduce the tongue pressure. Closed when measuring. That is, the gate valve 117 is opened and closed in the tongue pressure measuring step.

  The exhaust valve 118 is an electromagnetic valve for opening and closing the connection between the outside of the case 111 and the balloon body 121. In the present embodiment, the exhaust valve 118 is opened when releasing the pressure inside the balloon main body 121 after measuring the tongue pressure. Thereby, the air supplied to the inside of the balloon main body 121 is discharged to the outside of the case 111 via the tube 122, the air flow path 119, and the exhaust valve 118. Therefore, when the tongue pressure measurement is not performed, the inside of the balloon main body 121 is at the atmospheric pressure.

The display unit 112 is a liquid crystal display (LCD) for digitally displaying the pressure value detected by the pressure sensor 115, and is electrically connected to the control circuit 1.
The operation unit 113 is for operating the control circuit 1. Two operation units 113 are arranged on the front side of the case 111, and are electrically connected to the control circuit 1, respectively. By operating the operation unit 113, the user can turn on the power of the tongue pressure measuring device 100 or start measuring the tongue pressure.
The buzzer 114 emits an alarm sound in response to an alarm signal output from the control circuit 1. Details of the output of the alarm signal by the control circuit 1 will be described later.

[Control circuit]
The control circuit 1 is a circuit that controls operations of the display unit 112, the buzzer 114, the pressure sensor 115, the pump 116, the gate valve 117, the exhaust valve 118, and the like, and includes a storage unit 10 and a control unit 20.
The storage unit 10 stores various programs and various data for controlling the operation of the tongue pressure measuring device 100. As the various data, for example, an allowable voltage drop ΔVt that can be allowed as a voltage drop due to the internal resistance of the battery B, which will be described later, and the like are stored.

The control unit 20 is configured by a CPU (Central Processing Unit), and includes a drive control unit 21, a calculation unit 22, a comparison unit 23, an alarm unit 24, and a pressure measurement unit 25.
The drive control unit 21 outputs a drive signal for driving the pump 116, the gate valve 117, and the exhaust valve 118 by reading and executing various programs stored in the storage unit 10. The calculation unit 22 calculates the difference between the open-circuit voltage Vin1 and the terminal voltage Vin2 of the battery B as the actual voltage drop ΔVn. The comparison unit 23 compares the actual voltage drop ΔVn calculated by the calculation unit 22 with the allowable voltage drop ΔVt stored in the storage unit 10. The alarm unit 24 controls output of an alarm signal to the buzzer 114. The pressure measurement unit 25 receives a pressure value signal from the pressure sensor 115 and outputs a display signal corresponding to the input pressure value to the display unit 112.
Details of the function of the control unit 20 will be described later.

[Drive circuit]
FIG. 3 is a schematic diagram showing a circuit configuration of the drive circuit 30 of the gate valve 117.
As shown in FIG. 3, the gate valve 117 is electrically connected to the battery B, the drive circuit 30, and the control circuit 1. Further, the control circuit 1 is connected to the positive power supply VCC.
The drive circuit 30 of the gate valve 117 is a circuit for driving the gate valve 117, and includes a booster circuit 31 and a switch 32.
The booster circuit 31 is a circuit for boosting the terminal voltage Vin2 of the battery B and keeping the drive voltage Vc of the gate valve 117 constant. Thus, even when the terminal voltage Vin2 drops due to the consumption of the battery B, the drive voltage Vc and the drive current Ic of the gate valve 117 can be kept constant.

The switch 32 is a switch for opening and closing the drive circuit 30 of the gate valve 117. When a drive signal is input from the drive control unit 21, the drive circuit 30 is connected, and when the input of the drive signal is stopped, The drive circuit 30 is configured to be opened.
Here, in the present embodiment, the gate valve 117 is opened when the drive circuit 30 is connected, that is, when the drive current Ic is supplied, and when the drive circuit 30 is released, It is configured to be “closed” when the drive current Ic stops. Therefore, when a drive signal is input from the drive control unit 21 to the switch 32, the gate valve 117 is opened, and when the input of the drive signal is stopped, the gate valve 117 is closed.
In the present embodiment, the drive circuit 30 for the pump 116 and the exhaust valve 118 has the same configuration as the drive circuit 30 for the gate valve 117. Therefore, a detailed description is omitted.

[How to check voltage drop]
Next, a method of checking the battery voltage drop of the battery B by the control circuit 1 will be described.
FIG. 4 is a flowchart illustrating a process of confirming a voltage drop of the battery B.
As shown in FIGS. 2 to 4, the control unit 20 determines the open voltage Vin1 of the battery B in a state where power is not supplied to the pump 116, the gate valve 117, and the exhaust valve 118, that is, in a state where no load is applied. The measurement is performed, and the result is stored in the storage unit 10 (step S1).
In the present embodiment, the control unit 20 includes an A / D converter (not shown), and is configured to be able to measure the voltage of the battery B. However, the invention is not limited to this. For example, a voltmeter for measuring the voltage of the battery B may be separately provided, and the open voltage Vin1 may be measured by the voltmeter.

Next, the drive control unit 21 outputs a drive signal to the switch 32 to open the gate valve 117 (step S2).
Here, in the present embodiment, the process of step S2 is executed as one process of the tongue pressure measurement process by the tongue pressure measurement device 100, that is, the process of releasing the connection between the pump 116 and the balloon main body 121.

  In a state where the gate valve 117 is “open” in step S2, that is, in a state where the drive current Ic is supplied to the gate valve 117 and a load is applied to the battery B, the control unit 20 determines the terminal voltage of the battery B. Vin2 is measured, and the result is stored in the storage unit 10 (step S3). As a result, the open voltage Vin1 and the terminal voltage Vin2 of the battery B are stored in the storage unit 10. That is, the gate valve 117, which is an electromagnetic valve, is an example of the load of the present invention that requires the drive current Ic.

  Next, the drive control unit 21 stops outputting the drive signal to the switch 32, and “closes” the gate valve 117 (Step S4). Step S4 is executed as one step of the tongue pressure measurement step, similarly to step S2. That is, step S4 is executed as a step of “closing” the gate valve 117 to insert the balloon main body 121 into the oral cavity and measure the tongue pressure.

After step S4, the calculation unit 22 reads the open-circuit voltage Vin1 and the terminal voltage Vin2 stored in the storage unit 10, and calculates the difference between them as the actual voltage drop ΔVn (step S5). Here, the actual voltage drop ΔVn is a voltage drop due to the actual internal resistance r of the battery B.
Then, the comparison unit 23 compares the allowable voltage drop ΔVt corresponding to the open-circuit voltage Vin1 stored in the storage unit 10 with the allowable voltage drop ΔVt previously stored in the storage unit 10 and the open-circuit voltage as shown in FIG. Reference is made from a table indicating the relationship with Vin1 (step S6).

FIG. 5 is a diagram illustrating an example of a relationship between the allowable voltage drop ΔVt and the open circuit voltage Vin1 in the present embodiment.
Here, the internal resistance r of the battery B is represented by the following equation (1) from the open voltage Vin1, the terminal voltage Vin2 of the battery B, and the current consumption Iin when the gate valve 117 as a load is driven. Can be.

      r = (Vin1-Vin2) / Iin (1)

  The current consumption Iin when the gate valve 117 is driven is given by the following equation from the relationship of input power (current consumption Iin × terminal voltage Vin2) × efficiency u = output power (drive voltage Vc × drive current Ic) in the booster circuit 31. It can be obtained as in equation (2).

Iin × Vin2 × u = Vc × Ic
Iin = (Vc × Ic) / (u × Vin2) (2)

  Then, by expanding the above equations (1) and (2), the following equation (3) can be obtained.

r = (Vin1-Vin2) / ((Vc × Ic) / (u × Vin2))
ΔVt = r × ((Vc × Ic) / (u × Vin2)) (3)

Here, in the present embodiment, the efficiency u of the booster circuit 31 is, for example, 100%. The drive voltage Vc and the drive current Ic of the gate valve 117 are, for example, 2.9 V and 345 mA, respectively. Then, when the allowable maximum value of the internal resistance r is set to, for example, 1Ω, the allowable voltage drop ΔVt can be obtained from Expression (3). That is, the allowable voltage drop ΔVt can be obtained from the terminal voltage Vin2.
Here, when the open-circuit voltage Vin1 is a certain value, the terminal voltage Vin2 can be obtained from the equation (1). That is, the terminal voltage Vin2 is determined from the consumption current Iin. Then, the consumption current Iin can be obtained from Expression (2). That is, the consumption current Iin is determined from the terminal voltage Vin2. That is, when the terminal voltage Vin2 and the consumption current Iin determine the other value based on one value, the one value serving as the basis changes based on the determined other value. Therefore, in the present embodiment, the convergence values of the consumption current Iin and the terminal voltage Vin2 are obtained by repeatedly calculating the expressions (1) and (2). Then, based on the convergence value of the consumption current Iin and the terminal voltage Vin2, an allowable voltage drop ΔVt is obtained for each open voltage Vin1.
Then, the relationship between the open-circuit voltage Vin1 and the allowable voltage drop ΔVt is tabulated as shown in FIG. 5, for example, and stored in the storage unit 10 in advance. Note that the relationship between the open circuit voltage Vin1 and the allowable voltage drop ΔVt is not limited to a table as shown in FIG. 5 and stored in the storage unit 10 in advance. For example, an expression indicating the relationship between the open-circuit voltage Vin1 and the allowable voltage drop ΔVt may be stored in the storage unit 10 in advance.

Returning to FIG. 4, after step S6, the comparison unit 23 determines whether the actual voltage drop ΔVn calculated in step S5 is larger than the allowable voltage drop ΔVt referred to in step S6 (step S7). ).
If No is determined in the step S7, the process is terminated as it is.

  On the other hand, if Yes is determined in step S7, the alarm unit 24 outputs an alarm signal to the buzzer 114 (step S8). As a result, the buzzer 114 emits an alarm sound, and the user recognizes that the actual voltage drop ΔVn exceeds the allowable voltage drop ΔVt, that is, the battery B has deteriorated due to an increase in internal resistance. be able to. Therefore, the user can replace the battery B at this stage, so that an abnormal operation due to an increase in the internal resistance r of the battery B can be avoided.

[Effects of First Embodiment]
As described above, the first embodiment has the following advantages.
(1) A permissible voltage drop ΔVt that is permissible as a voltage drop due to the internal resistance r of the battery B is tabulated for each open voltage Vin1 and stored in the storage unit 10 of the control circuit 1 in advance. The calculation unit 22 calculates a difference between the open voltage Vin1 of the battery B actually used when no load is applied and the terminal voltage Vin2 of the battery B loaded with the gate valve 117 as the actual voltage drop ΔVn. . The comparison unit 23 compares the allowable voltage drop ΔVt at the open voltage Vin1 with the actual voltage drop ΔVn based on the data from the storage unit 10 and the data from the calculation unit 22, and as a result, ΔVt <ΔVn If there is, the alarm unit 24 outputs an alarm signal to the buzzer 114 to generate an alarm sound. Thereby, an abnormal operation due to an increase in the internal resistance r of the battery B can be avoided. As described above, in the present embodiment, the abnormality of the voltage drop due to the internal resistance r of the battery B can be detected with a simple structure without directly measuring the internal resistance r of the battery B itself.

(2) Since the battery B is composed of two dry batteries, it can be easily obtained. Therefore, when an alarm signal is output from the alarm unit 24 with an increase in the internal resistance r of the battery B, the battery B can be easily replaced.

(3) The tongue pressure measuring device 100 includes the control circuit 1, loads such as the pump 116, the gate valve 117, and the exhaust valve 118, and a case 111 that accommodates these loads, the control circuit 1, and the battery B. Further, the tongue pressure measuring device 100 includes an elastic balloon 120 having a restoring force, a tube 122 connected to the elastic balloon 120, and an air flow path 119. Therefore, during the measurement of the tongue pressure, the occurrence of an abnormal operation due to the increase in the internal resistance r of the battery B prevents the measured value from showing an abnormal value or preventing the measurement of the tongue pressure from being stopped. be able to.

(4) Further, the terminal voltage Vin2 when the gate valve 117, which is an electromagnetic valve, is driven as a load is measured, and the difference between the terminal voltage Vin2 and the open-circuit voltage Vin1 is calculated as the actual voltage drop ΔVn. Here, the gate valve 117, which is an electromagnetic valve, has a stable drive voltage Vc and a stable drive current Ic, so that a measurement error of the terminal voltage Vin2 of the battery B can be reduced. Therefore, an abnormal operation accompanying an increase in the internal resistance r of the battery B can be reliably avoided.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings.
The device of the second embodiment is different from the first embodiment in that it is a pressure generating device including a tank and a pressure pump.

FIG. 6 is a block diagram schematically illustrating the pressure generating device 200. The pressure generating device 200 is a device for generating a desired pressure, and is used to verify the accuracy of a pressure gauge. The pressure generating device 200 is a device that can be driven by a battery, and is an example of the device of the present invention.
6, a pressure generating device 200 includes a case 211, a display unit 212, an operation unit 213, a buzzer 214, a pressure sensor 215, a tank 216, and a pressurizing pump 217 for supplying a fluid to the tank 216. , An adjustment valve 218, an exhaust valve 219, an air flow path 220, a control circuit 1A, and a drive circuit 30A. In the case 211, the pressure sensor 215, the tank 216, the pressurizing pump 217, the regulating valve 218, and the exhaust valve 219 are connected by an air flow path 220. One end 220A of the air passage 220 is connected to a device for introducing air pressurized to an arbitrary pressure, and the other end 220B is open to the outside of the case 211.
The case 211 houses the display unit 212, the operation unit 213, the buzzer 214, the pressure sensor 215, the pressurizing pump 217, the regulating valve 218, the exhaust valve 219, and the battery B1 for supplying power to the control circuit 1A. ing. In the present embodiment, as in the first embodiment described above, the battery B1 is formed of a primary dry battery.
In addition, among the above, the configuration other than the control circuit 1A is the same as the configuration of the known pressure generating device, and the description thereof will be omitted.

[Control circuit]
The control circuit 1A is a circuit for controlling operations of the display unit 212, the buzzer 214, the pressure sensor 215, the pressurizing pump 217, the adjusting valve 218, the exhaust valve 219, and the like, and includes a storage unit 10A and a control unit 20A.
The storage unit 10A stores various programs and various data for controlling the operation of the pressure generating device 200. As the various data, similarly to the above-described first embodiment, an allowable voltage drop ΔVt that is allowable as a voltage drop due to the internal resistance of the battery B1 and the like are stored.

The control unit 20A is configured by a CPU (Central Processing Unit), and includes a drive control unit 21A, a calculation unit 22A, a comparison unit 23A, an alarm unit 24A, and a pressure setting unit 26.
The drive control unit 21A outputs a drive signal for driving the pressurizing pump 217, the adjustment valve 218, and the exhaust valve 219 by reading and executing various programs stored in the storage unit 10A.
The pressure setting unit 26 sets a pressure value generated by the pressure generating device 200. Based on the pressure value set by the pressure setting unit 26, the drive control unit 21A outputs a drive signal to the pressure pump 217 and the adjustment valve 218. The pressure setting control by the drive control unit 21A and the pressure setting unit 26 is the same as the control of a known pressure generating device.

  The functions of the calculation unit 22A, the comparison unit 23A, and the alarm unit 24A are the same as those in the first embodiment. That is, the calculation unit 22A calculates the difference between the open-circuit voltage Vin1 and the terminal voltage Vin2 of the battery B1 as the actual voltage drop ΔVn. In the present embodiment, the calculation unit 22A calculates the difference between the open-circuit voltage Vin1 of the battery B1 and the terminal voltage Vin2 in a state where a load is applied by the pressurizing pump 217. That is, in the present embodiment, the pressurizing pump 217 is an example of a load that requires a large driving current. The comparison unit 23A compares the actual voltage drop ΔVn calculated by the calculation unit 22A with the allowable voltage drop ΔVt stored in the storage unit 10A. The alarm unit 24A controls output of an alarm signal to the buzzer 214. Accordingly, when the comparing unit 23A determines that the actual voltage drop ΔVn calculated by the calculating unit 22A exceeds the allowable voltage drop ΔVt due to an increase in the internal resistance r of the battery B1, the alarm unit 24A sends an alarm signal to the buzzer 214. Output. Therefore, an abnormal operation due to the increase in the internal resistance r of the battery B1 can be avoided.

[Effect of Second Embodiment]
As described above, the second embodiment has the following advantages.
(5) The pressure generating device 200 includes a storage unit 10A and a control unit 20A, like the tongue pressure measurement device 100 according to the first embodiment described above, and the control unit 20A includes a calculation unit 22A, a comparison unit 23A, An alarm unit 24A is provided. Therefore, it is possible to prevent the occurrence of a pressure different from the set pressure value due to the abnormal operation due to the increase in the internal resistance of the battery B1.

[Modification]
It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.
In the first embodiment, the calculation unit 22 measures the terminal voltage Vin2 when the gate valve 117 is driven, and calculates the difference between the terminal voltage Vin2 and the open voltage Vin1 as the actual voltage drop ΔVn. , But is not limited to this. For example, the actual voltage drop ΔVn may be calculated by measuring the terminal voltage Vin2 when the pump 116 or the exhaust valve 118 is driven.

  In the first embodiment, the open-circuit voltage Vin1 and the terminal voltage Vin2 are measured when the gate valve 117 is opened and closed in one step of the tongue pressure measuring step. However, the present invention is not limited to this. For example, apart from tongue pressure measurement, a program for confirming the voltage drop of the battery may be stored in the storage unit in advance, and the open voltage Vin1 and the terminal voltage Vin2 may be measured by executing the program. Good.

  In each of the above embodiments, the batteries B and B1 are composed of primary batteries, but are not limited thereto. For example, the battery may be a secondary battery, as long as the terminal voltage decreases as the internal resistance increases.

  In each of the above embodiments, the alarm units 24 and 24A output an alarm signal to the buzzers 114 and 214, but the present invention is not limited to this. For example, the alarm unit may output an alarm signal to the display unit and display an alarm on the display unit, or the alarm unit may output an alarm signal to both the buzzer and the display unit. Good.

  In each of the above embodiments, the tongue pressure measuring device 100 and the pressure generating device 200 have been described as devices, but the present invention is not limited thereto. For example, the device may be an ultrasonic flowmeter having a vibrator as a load, or any device that drives a load with a battery.

  1, 1A control circuit, 10, 10A storage unit, 20, 20A control unit, 21, 21A drive control unit, 22, 22A calculation unit, 23, 23A comparison unit, 24, 24A alarm unit, 25: pressure measuring unit, 26: pressure setting unit, 30, 30A: driving circuit, 31: boosting circuit, 32: switch, 100: tongue pressure measuring device, 110: device body, 111: case, 112: display unit, 113 ... Operation unit, 114 buzzer, 115 pressure sensor, 116 pump, 117 valve (load), 118 exhaust valve, 119 air channel, 120 elastic balloon, 121 balloon body, 122 tube 200 pressure generator, 211 case, 212 display unit, 213 operation unit, 214 buzzer, 215 pressure sensor, 216 tank, 217 pressure pump (load), 218 Seiben, 219 ... exhaust valves, 220 ... air flow channel, B, B1 ... battery.

Claims (7)

A storage unit that stores in advance a relationship between an allowable voltage drop ΔVt that can be allowed as a voltage drop due to an internal resistance of a battery that can be used to drive a load, and an open circuit voltage Vin1 of the battery in a state where the load is not applied. ,
A calculating unit that calculates a difference between the open-circuit voltage Vin1 and a terminal voltage Vin2 of the battery under the load as an actual voltage drop ΔVn;
A comparing unit that compares the actual voltage drop ΔVn at the open voltage Vin1 calculated by the calculating unit with the allowable voltage drop ΔVt at the open voltage Vin1 stored in the storage unit;
A control unit that outputs a warning signal when the actual voltage drop ΔVn exceeds the allowable voltage drop ΔVt as a result of the comparison by the comparison unit. The control circuit according to claim 1,
The control circuit, wherein the battery is a primary battery. A control circuit according to claim 1 or 2,
Said load;
An apparatus comprising: the control circuit; a case accommodating the load and the battery; The device according to claim 3,
Equipped with a solenoid valve,
The device wherein the load is the solenoid valve. In the device according to claim 3 or 4,
An elastic balloon having a restoring force;
A flow path connected to an elastic balloon having a restoring force,
A pump for supplying air to the flow path,
The device wherein the load is the pump. In the device according to claim 3 or 4,
Tank and
A pressure pump that supplies fluid to the tank,
The device wherein the load is the pressurized pump. Preliminarily storing a relationship between an allowable voltage drop ΔVt allowable as a voltage drop due to an internal resistance of a battery that can be used to drive a load, and an open-circuit voltage Vin1 of the battery in a state where the load is not applied;
Calculating a difference between the open-circuit voltage Vin1 and a terminal voltage Vin2 of the battery under the load as an actual voltage drop ΔVn;
Comparing the calculated actual voltage drop ΔVn at the open circuit voltage Vin1 with the stored allowable voltage drop ΔVt at the open circuit voltage Vin1;
Outputting a warning signal when the actual voltage drop ΔVn exceeds the allowable voltage drop ΔVt as a result of the comparison.

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