TW201823746A - Detection device - Google Patents

Abstract

A detection device includes a first sensing resistor and a detection circuit. The first sensing resistor has a first terminal and a second terminal. The first terminal of the first sensing resistor is electrically connected to a power supply module. The second terminal of the first sensing resistor is electrically connected to a first load end of equipment under test. The detection circuit is configured to detect a potential difference between the first terminal and the second terminal of the first sensing resistor. The potential difference is configured to be compared to a predetermined value to generate a detection result. The detection device controls a first switching circuit according to the detection result so that the power supply module supplies a first supplying voltage to the first load end through the first switching circuit.

Description

Testing device

The present invention relates to a detecting device, and more particularly to a detecting device applied to a device to be tested.

With the development of the technology industry, each industry has its own machine equipment to produce its own products. However, before the receiving equipment is officially operated, the equipment usually needs to go through a test procedure to avoid damage to the equipment of the machine due to abnormalities in the internal circuit of the equipment (such as short circuit). Traditionally, the use of manual methods to detect machine equipment has been time consuming and the accuracy has to be improved. In order to improve the accuracy and convenience of the machine equipment detection, it is urgent to introduce an automated method to detect the machine equipment.

The invention provides a detecting device, which can automatically detect whether a short circuit occurs in a device to be tested, and then determine whether the power supply makes the device to be tested operate.

According to an embodiment of the invention, a detecting device includes a first sensing resistor and a detecting circuit. The first sensing resistor has a first end and a second end. The first end of the first sensing resistor is electrically connected to the power supply module, and the second end of the first sensing resistor is electrically connected to the first load end of the device to be tested. The detecting circuit is electrically connected to the power supply module, the device to be tested and the first sensing resistor. The detecting circuit is configured to detect a potential difference between the first end and the second end of the first sensing resistor. The potential difference is used to compare with a preset value to generate a detection result. The detecting device controls the first switching circuit according to the detection result, so that the first power supply voltage provided by the power supply module is transmitted to the first load end through the first switching circuit.

According to another embodiment of the present invention, a detecting apparatus includes a power supply module, a first sensing resistor, and a detecting circuit. The power supply module is configured to provide a first supply voltage. The first sensing resistor has a first end and a second end, and the first end of the first sensing resistor is electrically connected to the power supply module. The second end of the first sensing resistor is electrically connected to the first load end of the device to be tested. The detecting circuit is electrically connected to the power supply module, the device to be tested and the first sensing resistor. The detecting circuit is configured to detect a potential difference between the first end and the second end of the first sensing resistor, and the potential difference is used to compare with a preset value to generate a detection result. The detecting device controls the first switching circuit according to the detection result, so that the first power supply voltage provided by the power supply module is transmitted to the first load end through the first switching circuit.

In summary, the detection device provided by the present invention can detect the potential difference between the two ends of the sensing resistor, and compare with a preset value to generate a detection result, and determine whether the device under test is short-circuited according to the detection result. And controlling the first switching circuit, so that the first power supply voltage provided by the power supply module is transmitted to the first load end through the first switching circuit.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Referring to FIG. 1 and FIG. 2 together, FIG. 1 is a functional block diagram of a detecting apparatus according to an embodiment of the present invention. FIG. 2 is a circuit diagram of a detecting apparatus according to an embodiment of the invention. As shown in FIG. 1 and FIG. 2, the detection system 1 includes a power supply module 10, a device under test 12, a first switching circuit 14, and a detecting device 16. The detecting device 16 includes a first sensing resistor R1 and a detecting circuit 163. The first sensing resistor R1 has a first end and a second end. The first end is electrically connected to the power supply module 10, and the second end is electrically connected to the first load end 121 of the device under test 12. In one example, the power supply module 10 is a general power supply for supplying power and can have a current limiting function to prevent the back end circuit from being damaged due to excessive current supplied. The detecting circuit 163 is electrically connected to the power supply module 10, the device under test 12 and the first sensing resistor R1. The detecting circuit 163 is configured to detect a potential difference between the first end and the second end of the first sensing resistor R1. The potential difference is used to compare with a preset value to generate a detection result. In one example, the detection device 16 is actually a detection aid for detecting if the device under test 12 is shorted. In another example, the detecting device 16 is an integrated detecting device, that is, a detecting device including the power supply module 10, and can be used as a power supply for detecting whether the device under test 12 is short-circuited.

Specifically, as shown in FIG. 2, the power supply module 10 provides a voltage for testing (for example, 3 volts) to the first sensing resistor R1 and the first load terminal 121. At this time, the first sensing resistor R1 generates a voltage across the pole, that is, the potential difference between the two ends. It should be noted that the voltage should not be too large to prevent the device under test 12 from being damaged. The detecting circuit 163 is configured to measure the potential difference across the first sensing resistor R1. When the detecting circuit 163 measures the potential difference between the first sensing resistor R1, the value of the potential difference is further compared with a preset value, thereby obtaining a detection result. The detecting device 16 further controls the first switching circuit 14 according to the detection result, so that the first power supply voltage provided by the power supply module 20 is transmitted to the first load terminal 121 through the first switching circuit 14.

In an embodiment, as shown in FIG. 1, the detecting device 16 further includes a processing circuit 161. The processing circuit 161 is electrically connected to the detecting circuit 163, and the processing circuit 161 stores the preset value. In practice, the processing circuit 161 can be a programmable chip with a storage function. The processing circuit 161 is configured to compare the preset value with a potential difference between the first end and the second end of the first sensing resistor R1 to generate a detection result. In an embodiment, the power supply module 10 further provides a second supply voltage, and the second supply voltage is greater than the first supply voltage. In more detail, in this embodiment, the first supply voltage is used to detect whether the device under test 12 can operate normally. The second supply voltage is used to provide an operating voltage for the device under test 12 to operate. The detecting device 16 controls the second switching circuit 15 according to the detection result, so that the second power supply voltage provided by the power supply module 10 is transmitted to the first load terminal 121 through the second switching circuit 15.

In an embodiment. When the detection result is that the potential difference between the first end and the second end of the first sensing resistor R1 is less than the preset value and is less than the first threshold, the processing circuit 161 determines that the device under test 12 is abnormal. status. Specifically, when the potential difference between the first sensing resistor R1 is less than the preset value and less than the first threshold, it indicates that the first load terminal 121 of the device under test 12 has a short circuit. At this time, if the detecting device 16 controls the second switching circuit 15 so that the larger second power supply voltage is transmitted to the first load terminal 121 through the second switching circuit 15, the short-circuited device under test 12 may receive the second power supply voltage. And cause damage. In a practical example, assume that the preset value is 2.5 volts and the first threshold is 0.12 volts. The potential difference between the first sensing resistor R1 detected by the detecting circuit 163 is about 0.1 volt and the value is close to 0 volt. At this time, the processing circuit 161 determines that the first load terminal 121 of the device under test 12 is short-circuited. When the device under test 12 receives only a small first supply voltage for testing, a larger second supply voltage is not provided to the device under test 12 to prevent the device under test 12 from being damaged.

In another embodiment, when the detection result is that the difference between the potential difference between the first end and the second end of the first sensing resistor R1 and the preset value is less than the second threshold, then The processing circuit 161 determines that the device under test 12 is in a normal state. More specifically, when the potential difference between the first sensing resistor R1 is close to the preset value, it indicates that the first load terminal 121 of the device under test 12 does not have a short circuit, and the device under test 12 can operate normally. . At this time, the detecting device 16 controls the second switching circuit 15 so that the larger second power supply voltage is transmitted to the first load terminal 121 through the second switching circuit 15, thereby allowing the device under test 12 to start operating. In a practical example, assume that the preset value is 2 volts and the second threshold is 0.6 volts. The potential difference between the first sensing resistor detected by the detecting circuit 163 is 1.5 volts. The difference between the potential difference across the first sense resistor and the predetermined value is 0.5 volts, which is less than the second threshold value (0.6 volts), which represents that the potential difference across the first sense resistor R1 is close to the predetermined Set the value. At this time, the processing circuit 161 determines that the device under test 12 is not short-circuited and can operate normally. The detecting means 16 controls the second switching circuit 15 to cause the second supply voltage to be transmitted to the first load terminal 121 through the second switching circuit 15. When the device under test 12 receives the second supply voltage from the first load terminal 121, the formal operation can be started.

In one embodiment, as shown in FIG. 2, the detecting circuit 163 includes an arithmetic unit 1630 electrically connected to the resistors R2 and R3 and the capacitor C1 and the operating voltage terminal VD. The operator 1630 has a first input end and a second input end, and is electrically connected to two end points of the first sensing resistor R1. The potential across the first sense resistor R1 passes through the operator 1630, which in turn outputs a signal to the processing circuit 161. The processing circuit 161 compares the signal with the stored preset value to determine whether the first load terminal 121 of the device under test 12 is short-circuited. The device under test 12 of the foregoing embodiment includes only the first load terminal 121. However, in other embodiments, the device under test 12 includes a plurality of load terminals.

Please refer to FIG. 3. FIG. 3 is a circuit diagram of a detecting apparatus according to an embodiment of the invention. Compared with the foregoing embodiment, in this embodiment, the device under test 12 further includes a second sensing resistor R4 having a first end and a second end. The first end of the second sensing resistor R4 is electrically connected to the power supply module 10, and the second end is electrically connected to the second load end 123 of the device under test 12. In this embodiment, the detecting circuit 163 is configured to respectively detect a potential difference between the first end and the second end of the first sensing resistor R1 and the second sensing resistor R4, and measure the measured difference. The two potential differences are respectively compared with the preset values to generate a detection result. The detecting device 16 controls the first switching circuit according to the detection result, so that the first power supply voltage provided by the power supply module 10 is transmitted to the first load terminal 121 and the second load terminal 123 through the first switching circuit.

In the embodiment of FIG. 3, the power supply module 10 further provides a second supply voltage. The second supply voltage is greater than the first supply voltage. The detecting device 16 controls the second switching circuit 15 according to the detection result, so that the second power supply voltage provided by the power supply module 10 is transmitted to the first load terminal 121 and the second load terminal 123 through the second switching circuit 15. When the potential difference between the first end and the second end of at least one of the first sensing resistor R1 and the second sensing resistor R2 is less than a preset value and less than the first threshold, the detecting device 16 enables the power supply mode The first supply voltage provided by the group 10 is transmitted to the first load terminal 121 and the second load terminal 123 through the first switching circuit. In another example, when the difference between the potential difference between the first end and the second end of the first sensing resistor R1 and the preset value is less than the second threshold, and the second sensing resistor R4 When the difference between the potential difference between the first end and the second end and the preset value is also less than the second threshold value, the detecting device 16 causes the second power supply voltage provided by the power supply module 10 to pass through the second The switching circuit 15 is transmitted to the first load terminal 121 and the second load terminal 123. In more detail, in the embodiment of FIG. 3, the potential difference between the first end and the second end of at least one of the first sensing resistor R1 and the second sensing resistor R4 is less than a preset value and less than the first When a threshold value (assuming 0.1 volt) is used, the potential difference is close to 0 volt, which means that at least one of the first load terminal 121 and the second load terminal 123 is abnormal (short circuit). The device under test 12 receives only a small first supply voltage and does not receive a larger second supply voltage to prevent the device under test 12 from being damaged due to a short circuit. Conversely, when the potential difference between the first end and the second end of the first sensing resistor R1 and the potential difference between the first end and the second end of the second sensing resistor R4 are respectively between the preset values When the difference is less than the second threshold (assuming 0.5 volts), the potential difference between the first sensing resistor R1 and the second sensing resistor R4 is close to a preset value, that is, the device under test 12 There is no short circuit condition. At this time, the first load terminal 121 and the second load terminal 123 of the device under test 12 receive the second supply voltage and start to operate.

Please refer to FIG. 4. FIG. 4 is a circuit diagram of an over-temperature protection circuit according to an embodiment of the invention. In this embodiment, as shown in FIG. 4, the switching circuit 14 includes an arithmetic circuit 141 and a control module 143. The control module 143 is electrically connected to the detection circuit 163. The arithmetic circuit 141 supplies the control voltage Vc to the control module 143 according to the input voltage VIN and the reference voltage Vref. The control module 143 causes the detection circuit 163 to selectively receive the first supply voltage according to the control voltage Vc. The arithmetic circuit 141 includes an arithmetic unit 1410, resistors R10 and R11, and capacitors C2 and C3, and the control module 143 includes an electric group R12-R14 and a transistor T3. In this embodiment, the detecting device 16 further includes the over-temperature protection circuit 165 of FIG. The temperature protection circuit 165 has a thermal module 1650 electrically connected to the arithmetic circuit 141. The thermal module 1650 includes thermistors R7, R9, and transistors T1, T2. The thermistors R7 and R9 have a first end and a second end, respectively. The first ends of the thermistors R7 and R9 are electrically connected to the ground GND. In this embodiment, the thermistors R7 and R9 are adjacent to the detecting circuit 163. The impedance values of the thermistors R7 and R9 vary with the temperature of the detecting circuit 163.

Specifically, the thermistors R7 and R9 are a type of sensor resistor having different impedance values at different temperatures. In this embodiment, the thermistors R7 and R9 are disposed adjacent to the detecting circuit 163 for sensing the temperature generated when the detecting circuit 163 operates. When the temperature of the detecting circuit 163 rises, the resistance values of the thermistors R7 and R9 also decrease. On the contrary, when the temperature of the detecting circuit 163 is lowered, the resistance values of the thermistors R7 and R9 also rise.

The transistors T1 and T2 respectively have a main control end, a first end and a second end. The main terminals of the transistors T1 and T2 are electrically connected to the second ends of the thermistors R7 and R9, respectively, and are electrically connected to the working voltage terminals Vs through the resistors R6 and R8, respectively. The first end of the transistor T1 is electrically connected to the operation circuit 141, and is electrically connected to the operating voltage terminal Vs through the resistor R5. The second end of the transistor T1 is electrically connected to the first end of the transistor T2. The second end of the transistor T2 is electrically connected to the ground GND. The transistors T1 and T2 selectively turn on the current path of the operating voltage terminal Vs and the ground GND according to respective impedance values, thereby generating an input voltage VIN.

More specifically, when the temperature of the detecting circuit 163 starts to rise during the operation, the impedance values of the thermistors R7 and R9 decrease due to the temperature increase of the detecting circuit 163, and the transistors T1 and T2 The partial pressure of the master will also decrease. When the temperature of the detecting circuit 163 is too high, the voltage dividing causes the transistors T1 and T2 to not conduct the current path of the working voltage terminal Vs and the ground GND, so that the voltage supplied from the operating voltage terminal Vs flows into the arithmetic circuit 141. . At this time, the potential of the input voltage VIN is higher than the potential of the reference voltage Vref, and the control voltage Vc output from the arithmetic circuit 141 is high. The voltage received by the main control terminal of the transistor T3 in the control module 143 via the resistor R12 is also high. At this time, the transistor T3 is turned on, and the first supply voltage provided by the power supply module 10 is not It is input to the detection circuit 163, but flows directly into the ground GND. In this way, the detecting circuit 163 stops receiving the first supply voltage, and the circuit is not damaged due to excessive temperature due to continued operation, thereby achieving the effect of the protection detecting circuit.

In summary, in the operation of the detecting device provided by the present invention, the detecting circuit can detect the potential difference across the sensing resistor and compare it with a preset value to obtain the detection result, and according to the detection. As a result, it is determined whether the device under test is short-circuited, and the first switching circuit is controlled, so that the first supply voltage provided by the power supply module is transmitted to the first load end through the first switching circuit. Thereby, the detecting device of the invention can shorten the time for manually detecting the device to be tested, and reduce the loss caused by the artificial misjudgment. It can avoid the short circuit and cause the equipment to burn out, and improve the detection accuracy and improve the product quality.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1‧‧‧Detection system

10‧‧‧Power supply module

12‧‧‧Device under test

121‧‧‧First load end

123‧‧‧second load end

14‧‧‧First switching circuit

141‧‧‧Operating circuit

143‧‧‧Control Module

15‧‧‧Second switching circuit

16‧‧‧Detection device

161‧‧‧Processing Circuit

163‧‧‧Detection circuit

1630‧‧‧Operator

Vref‧‧‧reference voltage

VIN‧‧‧ input voltage

C1~C3‧‧‧ capacitor

R1‧‧‧First sense resistor

R4‧‧‧second sense resistor

R2, R3, R5, R6, R8, R10~R14‧‧‧ resistance

R7, R9‧‧‧ thermistor

T1~T3‧‧‧O crystal

Vs, VD‧‧‧ working voltage terminal

GND‧‧‧ ground terminal

1 is a functional block diagram of a detecting apparatus according to an embodiment of the present invention. FIG. 2 is a circuit diagram of a detecting apparatus according to an embodiment of the invention. FIG. 3 is a circuit diagram of a detecting apparatus according to an embodiment of the invention. FIG. 4 is a circuit diagram of an over-temperature protection circuit according to an embodiment of the invention.

Claims (10)

A detecting device includes: a first sensing resistor having a first end and a second end, the first end of the first sensing resistor being electrically connected to a power supply module, the first sensing resistor The second end is electrically connected to a first load end of the device to be tested; and a detecting circuit is electrically connected to the power supply module, the device to be tested and the first sensing resistor, and the detecting circuit And detecting a potential difference between the first end and the second end of the first sensing resistor for comparing with a preset value to generate a detection result, and the detecting device is configured according to the detection result And controlling a first switching circuit, so that a first power supply voltage provided by the power supply module is transmitted to the first load end through the first switching circuit. A detecting device includes: a power supply module for providing a first power supply voltage; a first sensing resistor having a first end and a second end, the first end of the first sensing resistor Electrically connecting the power supply module, the second end of the first sensing resistor is electrically connected to a first load end of the device to be tested, and a detecting circuit electrically connected to the power supply module The detecting device is configured to detect a potential difference between the first end and the second end of the first sensing resistor for comparing with a preset value, To generate a detection result, the detecting device controls a first switching circuit according to the detection result, so that the first power supply voltage provided by the power supply module is transmitted to the first load terminal through the first switching circuit. The detecting device of claim 1 or claim 2, further comprising a processing circuit electrically connected to the detecting circuit, wherein the processing circuit stores the preset value, and the processing circuit is configured to use the preset value according to the preset value a potential difference between the first end and the second end of the first sensing resistor to generate the detection result. The detecting device of claim 3, wherein the power supply module further provides a second power supply voltage, the second power supply voltage is greater than the first power supply voltage, and the detecting device controls a second switch according to the detection result. The circuit transmits the second supply voltage provided by the power supply module to the first load end through the second switching circuit. The detecting device of claim 4, wherein the detection result is that the potential difference between the first end and the second end of the first sensing resistor is less than the preset value and less than a first threshold The processing circuit determines that the device under test is in an abnormal state, and the detecting device transmits the first power supply voltage provided by the power supply module to the first load terminal through the first switching circuit. The detecting device of claim 4, wherein the difference between the potential difference between the first end and the second end of the first sensing resistor and the preset value is less than one The processing circuit determines that the device under test is in a normal state, and the detecting device transmits the second power supply voltage provided by the power supply module to the first load terminal through the second switching circuit. The detecting device of claim 3, further comprising a second sensing resistor having a first end and a second end, the first end of the second sensing resistor being electrically connected to the power supply module, The second end of the second sensing resistor is electrically connected to a second load end of the device under test, and the detecting circuit is further configured to detect the first end and the second end of the second sensing resistor The potential difference between the two is used to generate the detection result, and the detecting device controls the first switching circuit to enable the first power supply provided by the power supply module according to the detection result. The voltage is transmitted to the first load terminal and the second load terminal through the first switching circuit. The detecting device of claim 7, wherein the power supply module further provides a second power supply voltage, the second power supply voltage is greater than the first power supply voltage, and the detecting device controls a second switch according to the detection result. The circuit transmits the second supply voltage provided by the power supply module to the first load end and the second load end through the second switching circuit. The detecting device of claim 8, wherein the potential difference between the first end and the second end of the at least one of the first sensing resistor and the second sensing resistor is less than the detection result When the preset value is less than a first threshold, the processing circuit determines that the device under test is in an abnormal state, and the detecting device transmits the first power supply voltage provided by the power supply module to the first switching circuit to the The first load end and the second load end, when the detection result is that the difference between the potential difference between the first end and the second end of the first sensing resistor and the preset value is less than one The processing circuit determines that the test is to be performed when the difference between the potential difference between the first end and the second end of the second sense resistor and the preset value is less than the second threshold value The device is in a normal state, and the detecting device transmits the second power supply voltage provided by the power supply module to the first load end and the second load end through the second switching circuit. The detection device of claim 1 or claim 2, wherein the first switching circuit comprises an operation circuit and a control module, the control module is electrically connected to the detection circuit, and the operation circuit is based on an input voltage a reference voltage, providing a control voltage to the control module, the control module selectively causing the detection circuit to receive the first supply voltage according to the control voltage, the detection device further comprising an over-temperature protection circuit, including a thermal module electrically connected to the computing circuit, the thermal module comprising: at least one thermistor having a first end and a second end, the first end of the at least one thermistor Connecting a grounding end, the at least one thermistor is adjacent to the detecting circuit, and an impedance value of the at least one thermistor varies with the temperature of the detecting circuit; and at least one transistor has a master The first end and the second end, the main end of the at least one transistor is electrically connected to the second end of the at least one thermistor, and the first end of the at least one transistor is electrically connected The arithmetic circuit and a working electric End, the second end electrically connected to the ground terminal, the at least one transistor according to the impedance value selectively conducting current path of the operating voltage terminal and the ground terminal, the input voltage to generate the data.