KR20020037562A - Measurement apparatus for static electricity - Google Patents

Abstract

PURPOSE: A static electricity measuring apparatus is provided, which improves the accuracy of a product by removing an error as to a voltage variation while measuring a static electricity using a rating power supply voltage of ±5V. CONSTITUTION: A switching part(20) is connected to an output port of a battery(10) and determines whether to supply a driving voltage to the whole system. Static electricity sensor part(30) measures the intensity of a static electricity and then integrates and amplifies the measured static electricity. A real value output part(40) converts the measured static electricity into a real value. A converter part(50) compares the real value with a reference voltage, and a reference voltage providing part(60) provides the reference voltage to the converter part. An oscillator circuit part(70) provides a specific oscillation frequency to the converter part. A display part(80) displays the intensity of the static electricity according to a signal from the converter part. And a voltage comparison circuit part(90) judges a low voltage state by comparing a voltage of the battery with the reference voltage, and then outputs a signal for the comparison result to be displayed on the display part.

Description

Static electricity measuring instrument {Measurement apparatus for static electricity}

The present invention relates to an electrostatic measuring device, and more particularly, by measuring and displaying the intensity of static electricity generated in each object in a production line of a laboratory, a laboratory, or a specific industry, a user can easily measure the intensity of static electricity in each object. The present invention relates to an electrostatic measuring device for identifying.

In general, static electricity refers to a charge that is charged on a stationary state or extremely slow in movement. When an object made of different materials comes into contact, charged particles such as electrons or ions move almost instantaneously in a contact interface. Then, when the objects are separated, most of the charge returns, but some remain on the surface of the object to become static.

As a unique physical phenomenon in the vicinity of the static electricity, when a charge is present, the electrostatic energy possessed by the charge is emitted to the surrounding space, so that an area where the action of static electricity is applied to the surrounding space, that is, an electric field is formed to attract or repel a minute object It will affect the surroundings. All such disasters caused by static electricity are troubles caused by these phenomena, and static electricity generated in industrial sites is harmful to human body, causing industrial equipment and products to be destroyed, fire explosion, electric shock, and dust adsorption. Damage and product reliability and productivity degradation. For example, when static electricity acts on a living body, an electric shock may occur, and when acting as heat, a fire and an explosion accident or destruction of a semiconductor device may occur, and when acting as an electromagnetic wave, noise may occur. )

Due to the above reasons, there is a need to measure static electricity and to remove the static electricity, and an electrostatic measuring apparatus has been proposed. The static electricity measuring device measures an intensity of static electricity charged in a certain charged material, and is classified into an analog method and a digital method.

1 is a circuit diagram showing the configuration of a static electricity measuring device according to the prior art.

Referring to FIG. 1, reference numeral 1 denotes an electrostatic sensor that is disposed to face an object to be measured, and measures an intensity of static electricity, and 2 denotes a value measured by the electrostatic sensor 1 as a first resistor R1. It represents the buffer that is received through the output value as the effective value, 3 represents a magnification adjuster for adjusting the measurement magnification by adjusting the strength of the driving power is connected to the battery power (Vcc), 4 is the user can confirm the measured results The indicator indicates a numerical value so that 5 represents an amplifier for amplifying the signal output from the buffer 2 to a desired size and providing the indicator 4 to the indicator 4, and 6 represents a plurality of resistors R2 and R3. The reference voltage providing unit for dividing the battery power supply (Vcc) through and providing the amplifier 5 as a reference voltage, 7 is provided to the amplifier 5 so as to check the voltage of the battery. Blocking the output signal of the buffer 2, and shows a switching unit connecting the battery power source (Vcc) to the amplification unit (5).

The multiplier 3 is composed of a plurality of resistors and switches, when the transfer contact of the switch is connected to the A terminal, the total resistance is the same as the fourth resistor (R4), the transfer contact is connected to the B terminal In this case, the total resistance becomes equal to the sum of the fourth resistor and the fifth resistor (R4 + R5), so that the magnification can be adjusted.

In addition, the switching unit 7 is composed of a switching element, when the transfer contact is connected to the X terminal, the output signal of the buffer 2 is input to the amplifier 5, the transfer contact is the Y terminal When connected to the battery unit (Vcc) is connected to the amplifier 5 to check the voltage of the battery.

In the prior art configuration, the battery power source (Vcc) uses 9 V. When the battery power source (Vcc) is discharged and the voltage is changed according to the usage period of the electrostatic measuring device, the measured value of the measured value is changed. This causes a problem that the reliability of the measurement results is degraded.

In addition, since the voltage Vcc of the battery power source is displayed on the indicator 4 as a guide, it is difficult for general users to understand the replacement time of the battery, which makes the use of the static electricity measuring device inconvenient.

In addition, since the magnification is adjusted using a resistor and the voltage of the battery is changed according to the discharge, a zero point is changed every measurement, which causes a problem of lowering the reliability of the electrostatic measuring device system.

In addition, in the electrostatic measuring apparatus using the conventional rotating sector method, since the motor must be driven, the power consumption increases and the weight of the product increases.

The present invention has been made to solve the above problems, an object of the present invention is to provide an electrostatic measuring device that can improve the precision of the product by removing the error of the voltage change during the measurement of static electricity using a rated power of ± 5V To provide.

In addition, another object of the present invention is to automatically adjust the zero point during the measurement of static electricity, and to output all the signals detected by the sensor to the RMS (RMS) value by providing accurate measurement value to the user to improve the reliability of the measurement results It is to provide an electrostatic measuring device that can be improved.

In addition, another object of the present invention is to provide an electrostatic measuring device that can improve the user's convenience by accurately indicating the time of replacement of the battery by displaying the status of the battery voltage on the display means and warning the user of the precise measurement range. have.

In addition, another object of the present invention is that all functions are controlled according to the user's button selection, so that the measurement of the electrostatic data is made only when the measurement button is pressed to increase the convenience of use and to reduce the consumption of the battery To provide a device.

1 is a view showing a circuit configuration of a static electricity measuring device according to the prior art

2 is a block diagram showing a schematic configuration of an electrostatic measuring device according to the present invention

3 is a circuit diagram of a digital static electricity measuring device according to a preferred embodiment of the present invention.

4 is a circuit diagram of an analog static electricity measuring device according to an embodiment of the present invention.

5 (A), (B) is a view showing the appearance of the digital and analog electrostatic measuring apparatus according to the present invention

<Description of Symbols for Main Parts of Drawings>

10: battery power 20: switching unit

21: POWER switch 22: TEST switch

23 range switch 30 static electricity sensor

31 sensor 32 capacitor

33: reset switch 40: effective value output unit

41: buffer 42,43: operational amplifier

44: switch for adjusting the amplification degree 50: converter unit

60: reference voltage providing unit 70: oscillation circuit unit

80: display unit 81: power LED

82: battery LED 90: voltage comparison circuit

According to a feature of the present invention for achieving the above object, it is disposed so as to face the object to be measured, the electrostatic sensor unit for measuring and integrating and amplifying the intensity of static electricity, and inputs the value measured in the electrostatic sensor unit An effective value output unit for receiving and converting an effective value into an output value, a converter unit operating according to a specific oscillation frequency and comparing the effective value output from the effective value output unit with a reference voltage and outputting a resultant signal; A reference voltage providing unit providing an oscillation unit, an oscillation circuit unit providing a specific oscillation frequency to the converter unit, and a display for displaying the intensity of static electricity in digital or analog values according to a signal output from the converter unit. And the low voltage state is determined by comparing the voltage of the battery with the reference voltage. Provided is an electrostatic measuring device comprising a voltage comparison circuit for outputting a signal to be displayed on the display unit.

At this time, according to an additional feature of the present invention, the battery power is connected only to the output terminal of the battery power is turned on / off according to the user's operation to determine the operation of the system including the operation of the electrostatic sensor unit only when the static electricity is measured It is preferably configured to further include a switching unit to be supplied.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

2 is a block diagram showing a schematic configuration of an electrostatic measuring device according to the present invention, Figure 3 is a diagram showing a circuit configuration of the digital electrostatic measuring device according to the present invention.

2 and 3, reference numeral 10 denotes a battery power source, 20 denotes a switching unit connected to an output terminal of the battery power source 10 to determine whether to supply a driving voltage to the entire system, and 30 Denotes an electrostatic sensor unit which is disposed to face an object to be measured and integrates and amplifies by measuring the intensity of static electricity. Indicates an output part.

Further, reference numeral 50 denotes a converter unit operating according to a specific oscillation frequency and comparing the effective value output from the effective value output unit 40 with a reference voltage and outputting a resultant signal, and 60 denotes the reference to the converter unit 50. The reference voltage providing unit provides a voltage, 70 represents an oscillation circuit unit providing a specific oscillation frequency to the converter unit 50, and 80 represents a user of the strength of static electricity in accordance with a signal output from the converter unit 50. Indicates a display unit that displays digital or analog figures so that you can check.

Also, reference numeral 90 denotes a voltage comparison circuit unit for comparing the voltage of the battery power supply 10 with a reference voltage to determine a low voltage state and outputting a signal so that the result is displayed on the display unit 80.

In the above configuration, the power supply voltage for supplying the driving voltage to the system is automatically adjusted to zero during the test operation even when the output voltage is reduced by using a rated voltage of ± 5V so that accurate measurement is possible. It was. In addition, the switching unit 20 is turned on / off according to a user's operation to determine the driving of the system including the operation of the electrostatic sensor unit 30 so that the battery power supply 10 is supplied only during the electrostatic measurement. do.

In addition, since the capacitor 32 is connected in series to the sensor 31 in the electrostatic sensor unit 30, the voltage of the capacitor 32 varies according to the strength of the static electricity detected by the sensor 31, and the voltage is changed. Will print. At this time, the reset switch 33 is connected to the capacitor 32 in parallel to perform a function of completely discharging the capacitor 32 to reset while the system is not operated. In addition, the sensor 31 used in the above uses a charging plate sensor method, so that the measured value can be accurately read by charging and discharging of the charging plate. In addition, it is designed to measure the width of 50mm * 20mm in height to measure DC static electricity, and by using a flat plate electrostatic generator is calibrated to ensure maximum precision.

In addition, the effective value output unit 40 adjusts the amplification degree of the buffer 41, the two stage operational amplifiers 42 and 43, and the operational amplifier 42 of the previous stage, and the amplification degree adjustment switch to make the output voltage to the desired voltage value. And 44.

In the configuration of FIG. 3, an example of the digital static electricity measuring device has been described, but the present invention can be applied to an analog static electricity measuring device.

5 (A) and (B) are views showing the appearance of the digital and analog electrostatic measuring apparatus according to the present invention.

First, referring to FIG. 5A, in the digital static electricity measuring device, the switching unit 20 includes a power switch 21 for determining whether a driving voltage is supplied and a test for determining the start of static electricity measurement. (TEST) switch 22, and the display unit 80 includes a liquid crystal panel to display the strength of static electricity as a digital signal, that is, a number. In this case, not only the intensity of static electricity but also whether the battery power supply 10 and the power supply of the battery power 10 are displayed on the liquid crystal panel as numbers or letters.

Meanwhile, referring to FIG. 5B, in the analog electrostatic measuring apparatus, the switching unit 20 includes a power switch 21 for determining whether a driving voltage is supplied and a test for determining the start of static electricity measurement. And a (TEST) switch 22, and further comprising a range switch 23 for determining a measurement range. In addition, the display unit 80 includes an indicator hand and a display panel to determine the amount of rotation according to the measured intensity of static electricity in order to display the strength of the static electricity as an analog signal, and to indicate whether the battery power supply 10 is supplied. Power LED 81 and a battery LED 82, which is lit when the voltage of the battery power supply 10 falls below a reference value and informs the user when to replace the battery. .

Referring to the operation of the electrostatic measuring device according to the present invention having the configuration as described above are as follows. In this case, the following description will be given taking the case of digital as an example.

First, the user decides to supply the driving voltage by turning on the power switch 21, and immediately after the display unit 80 is turned on and the system is initialized, the user The start of the electrostatic measurement is determined by checking the power supply state and turning on the TEST switch 22. In this case, the user preferably maintains the sensor unit 30 at a distance of 50 cm (1 inch) to the electrical charge to be measured, and then turns on the test switch 22. The reason for this is that when the distance between the sensor unit 30 is far from the charged member, the measured value of static electricity decreases, and when the distance is close, the sensor may be destroyed due to static electricity.

The operation of the electrostatic sensor unit 30 is started by the above operation, and the voltage value charged and output to the capacitor 32 varies according to the strength of the static electricity sensed by the sensor 31. The voltage value output from the electrostatic sensor unit 30 is converted into an effective value while passing through the buffer 41 of the effective value output unit 40 and the operational amplifiers 42 and 43 of the second stage, and converted into the effective value to the converter unit 50. Is entered.

The converter unit 50 operates according to a specific oscillation frequency provided by the oscillation circuit unit 70, and compares an effective value output from the effective value output unit 40 with a reference voltage provided from the reference voltage providing unit 60. As a result, the result signal is output to the display unit 80. In this case, the display unit 80 displays a digital value so that the user can check the strength of the static electricity.

During the above operation, the voltage comparison circuit unit 90 continuously checks the output voltage of the battery power source 10 and compares it with a reference voltage to determine a low voltage state, and when the result is a low voltage, the display unit 80 It will output a signal to be displayed at.

Since the zero point of the driving voltage used in the system during the above operation uses zero voltage GND as zero point, the same zero point is continuously maintained even when the battery is used and the voltage is lowered. That is, in the present invention, when the test switch 22 is turned off, the zero point is automatically adjusted, so that accurate measurement is possible every time the static electricity is measured.

While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

As described above, the electrostatic measuring apparatus of the present invention eliminates an error of voltage change when measuring static electricity by using a rated power supply, outputs all signals detected by the sensor as RMS values, and measures static electricity. By automatically adjusting the zero point, the reliability of the measurement result can be improved, and the measurement range is ± 199.9kV, which has a wide measurement range, thereby improving the reproducibility and stability of the displayed value.

In addition, by displaying the status of the battery voltage on the display means to accurately inform the user when to replace the battery, by measuring the electrostatic data only when the measurement button is pressed to increase the ease of use and reduce the battery consumption It is effective to be.

In addition, in the present invention, since the motor is not required by using the charging plate sensor method, the power consumption can be reduced, and the product can be made smaller and lighter.

Claims (2)

An electrostatic sensor unit arranged to face the object to be measured and integrated and amplified by measuring the intensity of the static electricity, an effective value output unit which receives the value measured by the electrostatic sensor unit, converts it into an effective value, and outputs a specific oscillation; A converter unit operating according to a frequency and comparing the rms value output from the rms output unit with a reference voltage and outputting a resultant signal; a reference voltage providing unit providing a reference voltage to the converter unit; An oscillation circuit unit providing an oscillation frequency, a display unit displaying digital or analog values so that the user can check the strength of static electricity according to the signal output from the converter unit, and comparing the battery voltage with a reference voltage The voltage ratio for outputting the signal so as to determine and display the result on the display unit. Static electricity measuring device, characterized in that comprises a circuit. The method of claim 1, And a switching unit connected to an output terminal of the battery power to be turned on / off according to a user's operation to determine the driving of the system including the operation of the electrostatic sensor unit so that the battery power is supplied only during the static measurement. Electrostatic measuring device characterized in that.