KR20010112528A - Ground error detecting apparatus and method thereof - Google Patents

Abstract

A thin and light-weight compact information recorder/processor having a user identifying function and an equipment/system controller which can limit, control or manage the operation and functions of a system or equipment based on the information characteristic of the user after identifying the user by the user's fingerprint. The equipment/system controller is provided with a pressure- input thin fingerprint sensor, a memory for registering and storing users' fingerprints in advance, and a fingerprint correlating section which correlates newly input fingerprint data with the registered ones. Personal information characteristic of each user whose fingerprint data are registered is also stored in the memory. When the agreement between the newly input fingerprint data and the registered one is confirmed by the fingerprint correlation of the fingerprint correlating section, the operation and functions of the equipment or system are limited or controlled based on the personal information.

Description

Ground fault detection device and method of electronic product {GROUND ERROR DETECTING APPARATUS AND METHOD THEREOF}

The present invention relates to an apparatus and method for detecting a ground failure of an electronic product, and more particularly, a ground detector for detecting a ground state between a power input terminal and a load of an electronic product, and a waveform of a signal detected by the ground detector. The present invention relates to an apparatus and method for detecting a ground failure of an electronic product, comprising a control unit for advancing or blocking an operation of the electronic product.

Electrical appliances such as inverter air conditioners that use electricity must be grounded.

Conventionally, the ground rod is installed to prevent electric shock or lightning when installing the air conditioner. However, due to the lack of a space or a place to install the ground rod is often used without grounding, there was a lot of problems that can cause parts such as electric shock accident or lightning strike due to leakage current. The inverter air conditioner includes a carrier frequency in addition to the operating frequency to drive the compressor, which is charged with energy to the windings of the compressor during operation to generate a leakage current. This leakage current must exit along the ground wire, which, if not grounded, remains charged to the inverter air conditioner body. At this time, if the user comes into contact with the inverter air conditioner main body, an electric shock may be caused. In addition to inverter air conditioners, products that use capacitors also have the potential for an electric shock due to leakage current. In addition, as described above, if the electronic product capable of generating a leakage current is not grounded, there is a problem in that the product cannot be used due to component destruction during lightning strike.

The first object of the present invention for solving the above problems is to provide an apparatus and method for detecting a ground failure that can determine whether the ground before the use of electronic products.

It is a second object of the present invention to provide an apparatus and method for detecting a ground failure that can determine whether a ground line and a power line are misconnected before using an electronic product.

It is a third object of the present invention to provide an apparatus and method for detecting a ground failure that can prevent an electric shock accident caused by a leakage current caused by a ground failure when using an electronic product.

A fourth object of the present invention is to provide an apparatus and method for detecting a ground failure which can prevent component damage of an electronic product due to a lightning strike.

In order to achieve the above object, the ground fault detecting apparatus for an electronic product according to the present invention determines a ground detection unit for detecting a ground state between a power input terminal and a load of the electronic product, and determines a waveform of a signal detected by the ground detection unit. It is composed of a control unit for operating the product or block the normal operation.

The ground detector includes: a first photo coupler connected between one of the commercial power lines and the ground line and supplied with current from the controller; A second photo coupler connected between the other one of the commercial power lines and the ground line and supplied with current from the controller; A third photo coupler connected between an output terminal of the first and second photo couplers and a ground line to generate an output signal depending on whether the ground is connected; And a square wave converter converting the waveform of the current output from the output terminal of the third photo coupler into a square wave.

The square wave converter has a base terminal connected to the output terminal of the third photo coupler, a collector terminal connected to a transistor driving power supply through a pull-up resistor, and the emitter terminal has a grounded transistor.

Ground fault detection method according to a first embodiment of the present invention includes a ground determination step (S100) for determining whether the ground connection; And a ground connection error determination step S200 of determining whether the ground line is properly connected.

Determining whether the ground (S100) is a step of determining whether the power is turned on (S110); Outputting a ground check signal (S120); Determining whether the output signal Ro of the ground detector is a square wave (S130); And if the output signal Ro is not a square wave in step S130, determining and displaying the ground error (S180).

The ground connection error determination step (S200) may include comparing the high section (Rr) of the square wave at the time of normal ground with the high section of the output signal (Ro) when the output signal Ro is a square pie in step S130 (S140); In step S140, if the high section of the output signal Ro satisfies the high section range of the square wave at the normal ground, determining that the ground connection is normal and performing normal operation (S150); In the step S150, if the high section of the output signal Ro does not satisfy the high section of the square wave at the normal ground, determining whether the high section of the output signal Ro is greater than the high section of the square wave at the normal ground. (S160); In the step S160, if the high section of the output signal Ro is larger than the high section of the square wave at the normal ground, determining that the ground line and the power line are erroneously connected to each other to display a ground connection error and block normal operation. (S170); And in step S160, when the high section of the output signal Ro is smaller than the high section of the square wave at the normal ground, it is determined as a ground connection error to display a ground error and block normal operation (S180).

The ground fault detection method according to the second embodiment of the present invention includes a step (S300) of checking whether the first power line is grounded and a step (S400) of checking whether the second power line is grounded.

Determining whether or not the ground of the first power line (S300) is a power state determination step (S210) for determining whether the power is turned on; Outputting a high signal through the terminal A of the controller to operate the first photo coupler connected to the first power line when the power is turned on (S215); Detecting whether a square wave signal is input to the terminal C of the controller (S220); If the square wave signal is detected in step S220, it is determined whether the detected square wave signal satisfies a predetermined standard, and if the standard is satisfied, the method proceeds to a step of checking whether the second power line is grounded (S400) (S225); If the square wave signal is not detected in step S220, determining that the ground connection is bad, display a ground error and block the normal operation (S250); If the square wave signal detected in step S225 does not satisfy a predetermined standard, determining whether the detected square wave is larger than a predetermined range (S255); In step S255, if the detected square wave is larger than the predetermined range, determining that the power line and the ground line are incorrectly connected to display a power connection error and block normal operation (S260); If the square wave detected in step S255 is smaller than the predetermined range, it is configured to proceed to step S250.

The step of determining whether the second power line is grounded (S400) may include outputting a high signal through the terminal B of the controller to operate the second photo coupler connected to the second power line (S230); Detecting whether a square wave signal is input to the terminal C of the control unit (S235); If the square wave signal is detected in step S235, determining whether the detected square wave signal satisfies a predetermined standard (S240); If the square wave signal satisfies a predetermined standard in step S240, determining that the ground connection of the first and second power lines is normal, displaying normal ground connection, and then performing normal operation (S245); If the square wave signal is not detected in step S235, it is determined that the ground connection is defective to display a ground error and block the normal operation (S250); If the square wave signal detected in step S240 does not satisfy a predetermined standard, determining whether the detected square wave is larger than a predetermined range (S255); In step S255, if the detected square wave is larger than the predetermined range, determining that the power line and the ground line are incorrectly connected to display a power connection error and block normal operation (S260); If the square wave detected in step S255 is smaller than the predetermined range, it is configured to proceed to step S250.

According to the apparatus and method for detecting a ground failure of an electronic product according to the present invention, when the waveform of the signal detected at the terminal C of the controller is not a square wave, it is determined that it is not grounded to stop the operation of the electronic product, and If the waveform is a square wave, if it is not a square wave within a predetermined range, it is determined that the connection between the power line and the ground line is wrong, and cut off the normal operation of the electronic product. Accordingly, by preventing the product from operating in a state of poor grounding, it is possible to prevent electric shock accidents due to leakage current and component damage due to lightning.

1 is a schematic configuration diagram of a ground fault detection apparatus according to the present invention.

Figure 2 is a detailed circuit diagram of the ground detection unit according to the present invention.

3 is a signal waveform diagram at each point of the ground detector according to the present invention;

4 is a flowchart illustrating a ground fault detection method according to a first embodiment of the present invention.

5 is a flowchart illustrating a ground fault detection method according to a second embodiment of the present invention.

6 is a comparison diagram of input waveforms of the control terminal C for determining a steady state and a ground error state;

* Explanation of symbols for the main parts of the drawings *

150: load 200: ground detection unit

220: control unit PL1, PL2: power line

GND: Ground PC1, PC2, PC3: Photo Coupler

R1, R2: resistor for current limiting of phototransistor

R3, R4: resistor for photodiode current limiting

R5: bias resistor of transistor

R6: pull up resistor

R7: Bias resistor for determining turn-on level of PC3

C1, C2, C3: noise control capacitor

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

1 is a schematic configuration diagram of a ground fault detection apparatus according to the present invention. As shown in FIG. 1, the ground fault detecting apparatus according to the present invention includes a ground detector 200 and a controller 220. The ground detector 200 detects a ground state between the power input lines PL1 and PL2 of the electronic product and the load 150. The controller 220 operates the electronic product in a normal state or generates an error signal according to the waveform of the signal detected by the ground detector 200 and stops the operation of the electronic product.

2 is a detailed circuit diagram of the ground detector according to the present invention. The ground detector 200 includes a first photo coupler PC1, a second photo coupler PC2, a third photo coupler PC3, and a square wave converter 240. The first photo coupler PC1 includes a first photo transistor PT1 and a first photo diode PD1. The collector terminal of the first photo transistor PT1 is connected to one of the commercial power lines PL1 (the first power line) through the first photo transistor current limiting resistor R1, and the emitter terminal is connected to the first diode D1. And the first noise control capacitor C1 to the ground line GND. The first photodiode PD1 is connected to the output terminal A of the controller 220 through the first photodiode current limiting resistor R3. The second photo coupler PC2 includes a second photo transistor PT2 and a second photo diode PD2. The emitter terminal of the second photo transistor PT2 is connected to another one of the commercial power lines (PL2: second power line) through the second photo transistor current limiting resistor R2, and the emitter terminal is connected to the second diode. It is connected to the ground line GND via the D2 and the first noise control capacitor C1. The second photodiode PD2 is connected to the output terminal B of the controller 220 through the second photodiode current limiting resistor R4. The third photodiode PC3 is composed of a third phototransistor PT3 and a third photodiode PD3. A bias resistor R7 for determining the turn on level of the third photo coupler PC3 is connected in parallel with the third photodiode PD3 and the first noise control capacitor C1. The anode terminal of the third photodiode PD3 is connected to the cathode terminal of the second diode D2, and the cathode terminal of the third photodiode PD3 is grounded. The collector terminal of the third photo transistor PT3 is connected to the square wave converter 240, and the emitter terminal of the third photo transistor PT3 is grounded. The third photo coupler PC3 generates an output signal depending on whether the ground is connected. The square wave converter 240 includes a transistor TR1. The base terminal of the transistor TR1 is connected to the output terminal of the third photo coupler PC3 and is connected to the collector terminal of the transistor TR1 through the bias resistor R5 of the transistor. The base terminal of the transistor TR1 is also grounded through the second noise controlling capacitor C2. The emitter terminal of transistor TR1 is grounded. The collector terminal of the transistor TR1 is connected to the transistor driving power supply of 5V through the pull-up resistor R6, and grounded through the third noise control capacitor C3. The collector terminal of the transistor TR1 is connected to the input terminal C of the control unit 220.

2 and 3, the operation of the ground fault detection apparatus and the signal waveform at each point will be described. When the power of the electronic product is turned on, a high signal is output from the terminal A of the controller 220 to the first photodiode PD1 through the first photodiode current limiting resistor R3. The signal detected at the first waveform detection point P1 of FIG. 2 is a commercial AC power input through the first power line PL1 and the second power line PL2. The waveform of the signal detected at the first waveform detection point P1 of FIG. 2 is shown in P1 of FIG. 3, and the waveform of the signal output from the terminal A of the controller 220 is shown in A of FIG. 3. . When the first photodiode PD1 is turned on by the high signal output from the terminal A of the controller 220, the first photodiode PD1 emits light. The emitted light turns on the first photo transistor PT1. When the first photo transistor PT1 is turned on, the AC power input through the first power line PL1 is transferred to the first current limiting resistor R1, the first photo transistor PT1, and the first diode D1. Is approved. The waveform of the signal detected through the first diode D1 and detected at the second waveform detection point P2 is shown in the first half of P2 of FIG. 3. After the signal passing through the first diode D1 is removed by the first noise control capacitor C1, only a signal having a predetermined size or more is turned on by the turn-on level determining bias resistor R7, and then the third photodiode PD3. Is applied). At this time, the light emitted from the third photodiode PD3 turns on the third phototransistor PT3. When the third photo transistor PT3 is turned on, the transistor TR1 is turned on by a 5V transistor driving power supply. When the transistor TR1 becomes active, a square wave signal as shown in the first half of C of FIG. 3 is applied to the input terminal C of the controller 220.

Next, a high signal is output from the terminal B of the controller 220 to the second photodiode PD2 through the second photodiode current limiting resistor R4. In FIG. 3B, the waveform of the signal output from the terminal B of the controller 220 is illustrated. When the high signal output from the terminal B of the controller 220 is applied to the second photodiode PD2, the second photodiode PD2 emits light. The emitted light turns on the second photo transistor PT2. When the second photo transistor PT2 is turned on, the AC power input through the second power line PL2 includes the second photo transistor current limiting resistor R2, the second photo transistor PT2, and the second diode D2. Is applied. The waveform of the signal detected at the second waveform detection point P2 through the second diode D2 is shown in the second half of P2 in FIG. 3. After the signal passing through the second diode D2 is removed by the first noise control capacitor C1, only a signal having a predetermined size or more is turned on by the turn-on level determining bias resistor R7, and then the third photodiode PD3. Is applied). At this time, the light emitted from the third photodiode PD3 turns on the third phototransistor PT3. When the third photo transistor PT3 is turned on, the transistor TR1 is turned on by a 5V transistor driving power supply. When the transistor TR1 becomes active, a square wave signal as shown in the second half of C of FIG. 3 is applied to the input terminal C of the controller 220.

4 to 6, a ground fault detection method according to the first and second embodiments of the present invention will be described.

Ground fault detection method according to a first embodiment of the present invention includes a ground determination step (S100) for determining whether the ground connection; And a ground connection error determination step S200 of determining whether the ground line is properly connected.

In the step of determining whether the ground (S100), first, it is determined whether the power is turned on (S110). If the power is turned on in step S110, the control unit 220 outputs a ground check signal (A or B) (S120). When the output signal Ro is input from the ground detector 200 to the controller 220 by the ground check signal, the controller 220 determines whether the output signal Ro is a square wave (S130). If the output signal Ro is not a square wave in step S130, it is determined as a ground error and is displayed to block normal operation (S180).

In step S200, when the output signal Ro is a square pie in step S130, the high section of the output signal Ro is compared with the high section range Rr of the square wave at normal grounding (S140). If the high section of the output signal Ro satisfies the high section of the square wave at the normal ground in step S140, the control unit 220 determines that the ground connection is normal, and then operates normally. If the high section of the output signal Ro does not satisfy the high section of the square wave at the normal ground in step S150, it is determined whether the high section of the output signal Ro is greater than the high section of the square wave at the normal ground ( S160). If the high section of the output signal Ro is greater than the high section of the square wave at the normal ground in step S160, it is determined that the ground line and the power line are erroneously connected to each other, indicating a ground connection error and blocking normal operation ( S170). If the high section of the output signal Ro is smaller than the high section of the square wave at the normal ground in step S160, it is determined that the ground connection error indicates a ground error and blocks normal operation (S180).

The ground fault detection method of an electronic product according to the second embodiment of the present invention includes a step (S300) of checking whether the first power line is grounded and a step (S400) of checking whether the second power line is grounded.

In the step S300 of determining whether the first power line is grounded, first, a power state determination step S210 of determining whether the power is turned on is performed. If the power is turned on in operation S210, the controller 220 outputs a high signal through the terminal A of the controller 220 to operate the first photo coupler PC1 connected to the first power line PL1. (S215). The predetermined signal is output from the ground detector 200 to the terminal C of the controller 220 by the signal output through the A terminal of the controller 220. The controller 220 detects whether a square wave signal is input to the terminal C (S220). When the square wave signal is detected in step S220, it is determined whether the detected square wave signal satisfies a predetermined standard, and when the standard is satisfied, the second power line ground check step S400 is performed (S225). However, if the square wave signal is not detected in step S220, it is determined that the ground connection is bad, the ground error is displayed and normal operation is blocked (S250). If the square wave signal detected in step S225 does not satisfy a predetermined standard, it is determined whether the detected square wave is larger than a predetermined range (S255). In step S255, if the detected square wave is larger than the predetermined range, it is determined that the power line and the ground line are incorrectly connected to display a power connection error and block normal operation (S260). If the square wave detected in step S255 is smaller than the predetermined range, the flow proceeds to step S250.

In operation S400 of determining whether the second power line is grounded, a high signal is transmitted to the ground detector 200 through the terminal B of the controller 220 to operate the second photo coupler PC2 connected to the second power line PL2. It outputs (S230). The controller 220 detects whether a square wave signal is input from the ground detector 200 to the terminal C of the controller 220 (S235). If the square wave signal is detected in step S235, it is determined whether the detected square wave signal satisfies a predetermined standard (S240). If the square wave signal satisfies a predetermined standard in step S240, it is determined that the ground connection of the first and second power lines is normal, the ground connection is normally displayed, and then normal operation is performed (S245). If the square wave signal is not detected in step S235, it is determined that the ground connection is bad, display a ground error and block the normal operation (S250). If the square wave signal detected in step S240 does not satisfy a predetermined standard, it is determined whether the detected square wave is larger than a predetermined range (S255). In operation S255, when the detected square wave is larger than the predetermined range, it is determined that the power line and the ground line are incorrectly connected to display a power connection error and block normal operation (S260). If the square wave detected in step S255 is smaller than the predetermined range, the flow proceeds to step S250.

In the ground fault detection method of the electronic products according to the first and second embodiments of the present invention, the normal waveform of the signal input to the terminal C of the controller 220 is illustrated in N of FIG. 6. If the power line and the ground line are misconnected, the high level section of the square wave appears longer than the normal waveform N, as shown in AN1 of FIG. 6. On the other hand, when the ground is unstable, as shown in AN2 of FIG. 6, the high level section of the square wave is shorter than that of the normal waveform N. FIG.

According to the apparatus and method for detecting a ground failure of an electronic product according to the present invention, when the waveform of the signal detected at the terminal C of the controller is not a square wave, it is determined that it is not grounded to stop the operation of the electronic product, and If the waveform is a square wave, it is determined that the power line and the ground line are incorrectly connected if the square wave is not within a predetermined range, thereby stopping the operation of the electronic product. Therefore, according to the ground fault detection apparatus and method of the present invention, first, it is possible to determine whether the ground before the use of electronic products. Second, it is possible to determine whether the ground line and the power line are incorrectly connected before using the electronic product. Third, it is possible to prevent an electric shock due to leakage current that may be caused by a poor grounding when using electronic products. Fourth, if the normal ground is not confirmed, it is possible to prevent the electronic device from being damaged by lightning strikes by not performing the normal operation.

In the above, certain preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. will be.

Claims (9)

Ground fault detection unit for detecting the ground state between the power input terminal and the load of the electronic product and a control unit for stopping the operation of the product by determining the waveform of the signal detected by the ground detection unit Detection device. The method of claim 1, wherein the ground detection unit A first photo coupler connected between one of the commercial power lines and the ground line and supplied with a current from the controller; A second photo coupler connected between the other one of the commercial power lines and the ground line and supplied with current from the controller; A third photo coupler connected between an output terminal of the first and second photo couplers and a ground line to generate an output signal depending on whether the ground is connected; And And a square wave converter configured to convert a waveform of a current output from an output terminal of the third photo coupler into a square wave. The method of claim 2, wherein the square wave converter is characterized in that the base terminal is connected to the output terminal of the third photo coupler, the collector terminal is connected to the voltage supply through the pull-up resistor, the emitter terminal comprises a grounded transistor Ground fault detection device for electronic products. Determining whether the ground is connected to ground (S100); And The ground fault detection method of the electronic product, characterized in that it comprises a ground connection error determination step (S200) for determining whether the ground line is correctly connected. The method of claim 4, wherein the grounding determination step (S100) Determining whether the power is on (S110); Outputting a ground check signal (S120); Determining whether the output signal Ro of the ground detector is a square wave (S130); And If the output signal (Ro) is not a square wave in the step S130 and determined to display a ground error and block the normal operation (S180), characterized in that the fault configuration of the electronic product. The method of claim 5, wherein the ground connection error determination step (S200) If the output signal Ro is a square pie in step S130, comparing the high section of the output signal Ro with the high section range Rr of the square wave at the normal ground (S140); In step S140, if the high section of the output signal Ro satisfies the high section range of the square wave at the normal ground, determining that the ground connection is normal and performing normal operation (S150); In the step S150, if the high section of the output signal Ro does not satisfy the high section of the square wave at the normal ground, determining whether the high section of the output signal Ro is greater than the high section of the square wave at the normal ground. (S160); In the step S160, if the high section of the output signal Ro is larger than the high section of the square wave at the normal ground, determining that the ground line and the power line are erroneously connected to each other to display a ground connection error and block normal operation. (S170); And When the high section of the output signal (Ro) is smaller than the high section of the square wave at the normal ground in step S160, it is determined by the ground connection error to display the ground error and characterized in that it comprises a step of blocking the normal operation (S180) Ground fault detection method of an electronic product. Checking whether the first power line is grounded (S300); And Checking whether or not the ground of the second power line (S400) comprises a ground fault detection method of an electronic product. The method of claim 7, wherein the determining whether the first power line is grounded (S300) A power state determination step of determining whether the power is turned on (S210); Outputting a high signal through the terminal A of the controller to operate the first photo coupler connected to the first power line when the power is turned on (S215); Detecting whether a square wave signal is input to the terminal C of the controller (S220); If the square wave signal is detected in step S220, it is determined whether the detected square wave signal satisfies a predetermined standard, and if the standard is satisfied, the method proceeds to a step of checking whether the second power line is grounded (S400) (S225); If the square wave signal is not detected in step S220, determining that the ground connection is bad, display a ground error and block the normal operation (S250); If the square wave signal detected in step S225 does not satisfy a predetermined standard, determining whether the detected square wave is larger than a predetermined range (S255); In step S255, if the detected square wave is larger than the predetermined range, determining that the power line and the ground line are incorrectly connected to display a power connection error and block normal operation (S260); If the square wave detected in step S255 is smaller than the predetermined range, the ground fault detection method of the electronic product, characterized in that proceeds to step S250. The method of claim 8, wherein the determining whether the second power line is grounded (S400) Outputting a high signal through the terminal B of the controller to operate the second photo coupler connected to the second power line (S230); Detecting whether a square wave signal is input to the terminal C of the control unit (S235); If the square wave signal is detected in step S235, determining whether the detected square wave signal satisfies a predetermined standard (S240); If the square wave signal satisfies a predetermined standard in step S240, determining that the ground connection of the first and second power lines is normal, displaying the ground connection normal, and then performing normal operation (S245); If the square wave signal is not detected in step S235, it is determined that the ground connection is defective to display a ground error and to block the normal operation (S250); If the square wave signal detected in step S240 does not satisfy a predetermined standard, determining whether the detected square wave is larger than a predetermined range (S255); In step S255, if the detected square wave is larger than the predetermined range, determining that the power line and the ground line are incorrectly connected to display a power connection error and block normal operation (S260); If the square wave detected in step S255 is smaller than the predetermined range, the ground fault detection method of the electronic product, characterized in that proceeds to step S250.