Electricity meter power supply chip conduction impedance and undervoltage and overvoltage test tool

Abstract

The utility model relates to the technical field of chip testing, and discloses an ammeter power supply chip conduction impedance and undervoltage and overvoltage testing tool comprising a PCB circuit board, an IC socket, a three-gear switch, a resistor element, a potentiometer and a capacitor element. The working voltage of the chip VCC is adjusted by adjusting the potentiometer, so that the chip can work normally, and chips with different VCC voltages can be met; vCC voltage is changed through the adjusting switch, and overvoltage and undervoltage testing of VCC is carried out; the chip CS is short-circuited to the ground through the adjusting switch to carry out on-resistance test; overvoltage and undervoltage are adjusted through the switch, undervoltage and overvoltage tests can be carried out in one step, and a potentiometer does not need to be continuously adjusted for testing.

Description

TECHNICAL FIELD

[0001] The utility model relates to chip test technical field more particularly to a kind of electric meter power chip conduction impedance and undervoltage and overvoltage test tool. BACKGROUND

[0002] Now the integration of power chip product is higher and higher, the electrical characteristics and reliability of chip must be accurately tested, some pins of chip have multiple functions, such as VCC power supply pin, it has overvoltage protection and undervoltage protection function, when testing the performance of chip, the starting voltage / overvoltage / undervoltage of VCC pin and the conduction impedance of built-in MOS are tested, conventional test is to make a power board, install a chip socket at the position of chip, install the tested chip on the socket, supply high-voltage alternating current to the power board, supply direct current at VCC position, adjust the voltage of direct current power supply to make VCC start normally and test undervoltage and overvoltage, this test method needs two sets of power supply, when chip is defective, it is good to damage direct current power supply when alternating current power supply is higher than direct current power supply voltage, after testing the undervoltage and overvoltage function of VCC, the tested chip is removed from the power board and installed on another small board, the CS resistor is short-circuited, a current-limiting direct current source is connected at SW end, and the voltage and current of SW pin are tested by oscilloscope at the same time, and the conduction impedance is obtained by voltage divided by current. This test needs multiple power supplies, the investment cost is large, the equipment needs to be converted multiple times during testing, the chip needs to be plugged in and out multiple times, and a large amount of manpower and equipment cost is invested during aging batch testing, which is time-consuming and labor-intensive.

[0003] Therefore, the utility model provides a kind of electric meter power chip conduction impedance and undervoltage and overvoltage test tool, the working voltage of chip VCC can be adjusted by adjusting potentiometer, so that the chip can work normally, and different VCC voltage chips can be met;VCC overvoltage and undervoltage test can be carried out by adjusting switch to change VCC voltage;Conduction resistance test can be carried out by adjusting switch to short-circuit chip CS to ground. UTILITY MODEL CONTENTS

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a kind of electric meter power chip conduction impedance and undervoltage and overvoltage test tool, only two direct current power supplies are needed, the circuit parameters are adjusted, the chip is powered at the same time, the working voltage of VCC can be adjusted by adjusting potentiometer, the voltage of VCC pin can be changed by adjusting rocker switch to start, overvoltage and undervoltage test, the conduction impedance of chip can be tested by adjusting another switch, only one insertion of chip is needed to test multiple performances of chip, it is economical and practical, can save manpower and equipment cost, is convenient to manage, improves work efficiency, to solve the problems existing in the above-mentioned background art.

[0005] The utility model provides the following technical scheme: an ammeter power supply chip conduction impedance and under -voltage and over -voltage test frock, including,

[0006] PCB circuit board, IC socket, three gear switch, resistance element, potentiometer and capacitor element are tested.

[0007] Preferably, the step of testing comprises:

[0008] Step S1: the connection of circuit board is carried out;

[0009] Step S2: VCC starting voltage test;

[0010] Step S3: overvoltage and under -voltage test;

[0011] Step S4: chip conduction impedance test.

[0012] Preferably, the connection of circuit board in the step S1 is specifically as follows:

[0013] 50V DC voltage is added to frock board, V+ connects power supply anode, V- connects power supply cathode, power supply anode passes through antireflection diode D1, current-limiting resistance R5 and R6 and reaches the NC end of swing switch K3, the ON of swing switch K3 is connected to the negative pole of D1, COM foot is connected to the 2 foot of J1, the 1 foot of J1 is connected to the SW foot of chip, and the power supply is supplied through R7, R9, VR1 and VR2 after voltage division, passes through C2 filter, passes through R12 and is connected to the 5 foot of chip, and the 1 foot of chip passes through R1 and R2 and connects the negative pole of power supply, and is connected to the ON end of switch K2 together, and the COM end and NC end of switch K2 are connected to the negative pole of power supply, and the 2 foot and 3 foot are connected to the negative pole of power supply through resistance R3 and R4 respectively, and the 4 foot is connected to the negative pole of power supply through R8 or C1;The COM end of K1 is connected to R12 / C1 and the 1 foot of VR1, the ON end is connected to R7 and the 3 foot of VR1, and the NC end is connected to R9 and the 3 foot of VR2;The 1 foot and 2 foot of J1 are welded to a jumper wire, and the current probe is clamped.

[0014] Preferably, the specific mode of VCC starting voltage test in the step S2 is as follows:

[0015] Adjusting resistance R8 to 51K, setting 4-pin voltage to 2.5V, normal working voltage of the chip, adjusting R3 and R4 to 0R, setting 2-pin and 3-pin to ground, 1-pin to CS sampling resistance R1 and R2, R1 to 100R, R2 not connected, adjusting VR1 and VR2, setting 5-pin to 20V, normal working voltage of the chip, switch K1 to COM position, VCC normal voltage of the chip, K3 to NC position, driving output pin to power supply, K2 to NC position, sampling feedback resistance normal working, one voltage probe of the oscilloscope positive to 7-pin and 8-pin of the chip, negative to power supply V-, another voltage probe positive to 5-pin of the chip, negative to power supply V-, at this time, power supply is turned on, waveforms of the oscilloscope are observed, 7-pin and 8-pin of the chip have voltage waveform output, at the same time, VCC voltage of 5-pin of the chip also rises, when the first waveform of 7-pin and 8-pin is output, corresponding VCC voltage of 5-pin is the starting voltage of the chip, and the voltage value at this time is recorded.

[0016] Preferably, the specific way of overvoltage test in step S3 is:

[0017] Switch K1 to ON position, short-circuit VR1, upper voltage dividing resistance becomes smaller, resulting in VCC voltage of 5-pin rising, when the voltage exceeds VCC overvoltage protection voltage, the chip will be turned off, 7-pin and 8-pin have no waveform output, when 7-pin and 8-pin have no waveform, corresponding VCC voltage of 5-pin is the overvoltage of the chip, and the voltage at this time is recorded.

[0018] Preferably, the specific way of overvoltage test in step S3 is:

[0019] Switch K1 to NC position, short-circuit VR2, lower voltage dividing resistance becomes smaller, resulting in VCC voltage of 5-pin falling, when the voltage is lower than VCC under-voltage protection voltage, the chip will be turned off, 7-pin and 8-pin have no waveform output, when 7-pin and 8-pin have no waveform, corresponding VCC voltage of 5-pin is the under-voltage of the chip, and the voltage at this time is recorded.

[0020] Preferably, the specific way of overvoltage test in step S3 is:

[0021] Switch K1 is hit to COM position, 5 foot VCC voltage normal power supply, switch K2 is hit to ON end, short circuit 1 foot CS resistance, let the current through the chip can reach maximum, K3 is hit to COM foot, chip 7 foot and 8 foot disconnect resistance R5 and R6, at VD end again connect a DC source, set chip conduction impedance test condition 5V and 0.5A, first open the first DC power supply, let 5 foot VCC normal power supply, then open the DC power supply connected at VD, at this time, chip 7 foot and 8 foot will start output voltage waveform, current probe has current waveform simultaneously, read the average voltage value of the first voltage waveform and the current average value of the corresponding first current waveform, and the resistance value obtained by dividing the voltage value by the current value is the on-resistance value of the chip.

[0022] The technical effects and advantages of the utility model are as follows:

[0023] The utility model discloses a chip VCC working voltage is adjusted through the adjustment potentiometer, can make the chip work in normal work, can satisfy the chip of different VCC voltage, the overvoltage and undervoltage test of VCC are carried out through the adjustment switch, the on-resistance test is carried out through the adjustment switch and make the chip CS short circuit to the ground, the overvoltage and undervoltage voltage are adjusted through the switch, can be one-step to place and carry out the undervoltage and overvoltage test, do not need to test by adjusting the potentiometer ceaselessly, the utility model discloses a chip can be tested on-resistance through the adjustment switch, does not need to make the tooling additionally, does not need to plug in and plug out the chip for many times, can test the multiple characteristics of chip one-step to place, save the cost, improve work efficiency, the utility model discloses the volume is small, and the storage and management are convenient. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the whole structure schematic diagram of the utility model.

[0025] Figure 2 It is the circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0026] The technical scheme in the utility model will be described clearly and completely in combination with the drawings in the utility model, and in addition, the form of each structure recorded in the following implementation is only an example, and the power supply chip on-resistance and undervoltage and overvoltage test tool of the utility model is not limited to each structure recorded in the following implementation, all other implementation obtained by the ordinary skill in the art without making creative labor belongs to the range of protection of the utility model.

[0027] As Figure 1 The utility model discloses a kind of power supply chip on-resistance and undervoltage and overvoltage test tool of electric meter, including PCB circuit board, IC socket, three-gear switch, resistance element, potentiometer and capacitor element;Test steps include:

[0028] Step S1: connecting the circuit board;

[0029] Step S2: VCC starting voltage test;

[0030] Step S3: overvoltage and undervoltage test;

[0031] Step S4: chip conduction impedance test.

[0032] In this embodiment, it needs to be specifically pointed out that the connecting the circuit board in step S1 is specifically as follows:

[0033] A 50V DC voltage is applied to the tooling plate, V+ is connected to the positive pole of the power supply, V- is connected to the negative pole of the power supply, the positive pole of the power supply is connected to the NC end of the swing switch K3 through the anti-reverse diode D1, current limiting resistors R5 and R6, the ON of the swing switch K3 is connected to the negative pole of D1, the COM pin is connected to the 2 pin of J1, the 1 pin of J1 is connected to the SW pin of the chip, the DC power supply is supplied through R7, R9, VR1 and VR2 after being divided, then is filtered through C2, and is connected to the 5 pin of the chip through R12, the 1 pin of the chip is connected to the negative pole of the power supply through R1 and R2, and is connected to the ON end of the switch K2 at the same time, the COM end and the NC end of the switch K2 are connected together to the negative pole of the power supply, the 2 pin and the 3 pin are connected to the negative pole of the power supply through resistors R3 and R4 respectively, the 4 pin is connected to the negative pole of the power supply through R8 or C1. The COM end of K1 is connected to R12 / C1 and the 1 pin of VR1, the ON end is connected to R7 and the 3 pin of VR1, and the NC end is connected to R9 and the 3 pin of VR2. The 1 pin and the 2 pin of J1 are welded with a jumper wire, and a current probe is clamped.

[0034] In this embodiment, it needs to be specifically pointed out that the VCC starting voltage test in step S2 is specifically as follows:

[0035] Adjust the resistance R8 to 51K, set the 4 pin voltage to 2.5V, which is the normal working voltage of the chip, adjust R3 and R4 to 0R, set the 2 pin and the 3 pin to ground, the 1 pin is connected to the CS sampling resistors R1 and R2, R1 is 100R, R2 is not connected, adjust VR1 and VR2, set the 5 pin to 20V, which is the normal working voltage of the chip, turn K1 to the COM position to supply the chip with normal voltage, turn K3 to the NC position to drive the output pin to the power supply, and turn K2 to the NC position to make the sampling feedback resistor work normally. The positive pole of one voltage probe of the oscilloscope is connected to the 7 pin and the 8 pin of the chip, the negative pole is connected to the power supply V-, the positive pole of the other voltage probe is connected to the 5 pin of the chip, and the negative pole is connected to the power supply V-. At this time, the power supply is turned on, the waveform of the oscilloscope is observed, the 7 pin and the 8 pin of the chip will have voltage waveform output, and at the same time the VCC voltage of the 5 pin of the chip will also rise. When the first waveform output of the 7 pin and the 8 pin corresponds to the VCC voltage of the 5 pin, the VCC voltage is the starting voltage of the chip, and the voltage value at this time is recorded.

[0036] In this embodiment, it needs to be specifically pointed out that the specific way of overvoltage test in step S3 is:

[0037] The switch K1 is turned to the ON position, the VR1 is short-circuited, the upper voltage dividing resistor is reduced, the voltage of the 5th pin VCC is increased, when the voltage exceeds the overvoltage protection voltage of VCC, the chip will be turned off, there is no waveform output at the 7th pin and the 8th pin, when there is no waveform at the 7th pin and the 8th pin, the voltage of the 5th pin VCC corresponding to the chip overvoltage is observed, and the voltage at this time is recorded.

[0038] In this embodiment, it needs to be specifically pointed out that the specific way of overvoltage test in step S3 is:

[0039] The switch K1 is turned to the NC position, the VR2 is short-circuited, the lower voltage dividing resistor is reduced, the voltage of the 5th pin VCC is reduced, when the voltage is lower than the overvoltage protection voltage of VCC, the chip will be turned off, there is no waveform output at the 7th pin and the 8th pin, when there is no waveform at the 7th pin and the 8th pin, the voltage of the 5th pin VCC corresponding to the chip overvoltage is observed, and the voltage at this time is recorded.

[0040] In this embodiment, it needs to be specifically pointed out that the specific way of overvoltage test in step S3 is:

[0041] The switch K1 is turned to the COM position, the 5th pin VCC voltage is normally powered, the switch K2 is turned to the ON end, the 1st pin CS resistor is short-circuited, the current flowing through the chip can reach the maximum, K3 is turned to the COM pin, the chip 7th pin and 8th pin are disconnected from the resistors R5 and R6, a direct current source is connected at the VD end, the chip conduction impedance test conditions of 5V and 0.5A are set, the first direct current source is turned on to normally power the 5th pin VCC, and then the direct current source connected at the VD end is turned on, at this time, the chip 7th pin and 8th pin will start to output voltage waveform, and there is a current waveform on the current probe, the average voltage value of the first voltage waveform and the average current value of the corresponding first current waveform are read, and the resistance value obtained by dividing the voltage value by the current value is the conduction resistance value of the chip.

[0042] In this embodiment, it needs to be specifically pointed out that in the chip pin, the 1st pin is the CS function, the circuit sampling feedback; the 2nd pin is the BR detection function; the 3rd pin is the GND function; the 4th pin is the FB function, the voltage sampling feedback; the 5th pin is the VCC function, the chip is powered, and there is an overvoltage and overvoltage protection function; the 6th pin is NC, empty pin, no function; the 7th pin and the 8th pin are SW pins, which output driving waveform.

[0043] The utility model discloses, need concrete explanation only two direct current power supply, adjusts circuit parameter, and gives the chip power supply time, gives VCC power supply simultaneously, can adjust the working voltage of VCC through the adjustment of potentiometer, through the adjustment of the swing head switch, can change the voltage of VCC pin and start / overvoltage / undervoltage test, through the adjustment of another switch, can test the on impedance of chip, only needs to insert the chip once to test the multiple performance of chip, and the economy is practical, can save manpower and equipment cost, and the management is convenient, improves work efficiency, can test multiple functions of chip once installation, simple structure, practicality is strong, and the management is convenient, can save cost and improve work efficiency.

[0044] The utility model discloses VCC power supply voltage can adjust voltage through potentiometer, can test the chip of different VCC voltage with practicality;The utility model discloses through the switch adjustment overvoltage and undervoltage voltage, can be one step to place and carry out undervoltage and overvoltage test, need not stop adjusting potentiometer and test;The utility model discloses through the adjustment switch, can test on impedance, need not make another tooling, need not insert the chip for many times, one step to place and test multiple characteristics of chip, save cost, improve work efficiency;The utility model discloses small, and the management is convenient with the storage.

[0045] Finally: the above-mentioned only for the preferred embodiment of the utility model has, and does not limit the utility model, any modification, equivalent replacement, improvement etc. that is made within the spirit and principles of the utility model, should include in the protection scope of the utility model.

[0046] The above-mentioned, only for the specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled in the art person in the technical range of the present application, can easily think of the change or replacement, all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be the protection scope of the claim.

Claims

1. A testing fixture for the conduction impedance, undervoltage, and overvoltage of a power meter chip, characterized in that: Comprise: PCB circuit board, IC socket, three-gear switch, resistance element, potentiometer and capacitor element; And test.

2. The power supply chip on-off impedance, under-voltage and over-voltage test tool for an electric meter according to claim 1, characterized in that: The steps of the test include: Step S1: connecting the circuit board; Step S2: VCC starting voltage test; Step S3: overvoltage and undervoltage test; Step S4: chip conduction impedance test.

3. The power supply chip on-off impedance, under-voltage and over-voltage test tool for an electric meter according to claim 2, characterized in that: The specific way of connecting the circuit board in step S1 is: A 50V DC voltage is applied to the tooling plate, V+ is connected to the positive pole of the power supply, V- is connected to the negative pole of the power supply, the positive pole of the power supply is connected to the NC end of the swing switch K3 through the anti-reverse diode D1, current limiting resistors R5 and R6, the ON of the swing switch K3 is connected to the negative pole of D1, the COM pin is connected to the 2 pin of J1, the 1 pin of J1 is connected to the SW pin of the chip, the DC power supply is supplied through R7, R9, VR1 and VR2 after voltage division, then filtered through C2, and connected to the 5 pin of the chip through R12, the 1 pin of the chip is connected to the negative pole of the power supply through R1 and R2, and connected to the ON end of the switch K2 at the same time, the COM end and the NC end of the switch K2 are connected together to the negative pole of the power supply, the 2 pin and the 3 pin are connected to the negative pole of the power supply through resistors R3 and R4 respectively, and the 4 pin is connected to the negative pole of the power supply through R8 or C1; the COM end of K1 is connected to R12 / C1 and the 1 pin of VR1, the ON end is connected to R7 and the 3 pin of VR1, and the NC end is connected to R9 and the 3 pin of VR2; the 1 pin and the 2 pin of J1 are welded with a jumper wire, and a current probe is clamped.

4. The power supply chip on-off impedance, under-voltage and over-voltage test tool for an electric meter according to claim 3, characterized in that: The specific way of VCC starting voltage test in step S2 is: Adjust the resistance R8 to 51K, set the 4 pin voltage to 2.5V, the normal working voltage of the chip, adjust R3 and R4 to 0R, set the 2 pin and the 3 pin to ground, the 1 pin is connected to the sampling resistors R1 and R2, R1 is 100R, R2 is not connected, adjust VR1 and VR2, set the 5 pin to 20V, the normal working voltage of the chip, switch K1 to COM position, let the chip VCC normal voltage power supply, K3 to NC position, drive output pin connected to the power supply, K2 to NC position, let the sampling feedback resistor work normally, one voltage probe of the oscilloscope is connected to the 7 pin and the 8 pin of the chip, the negative pole is connected to the power supply V-, the other voltage probe is connected to the 5 pin of the chip, the negative pole is connected to the power supply V-, at this time the power supply is turned on, observe the oscilloscope waveform, the 7 pin and the 8 pin of the chip will have voltage waveform output, at the same time the VCC voltage of the 5 pin of the chip will also rise, when the first waveform output of the 7 pin and the 8 pin corresponds to the VCC voltage of the 5 pin, it is the starting voltage of the chip, record the voltage value at this time.

5. The power supply chip on-off impedance and under-voltage and over-voltage test tool for an electric meter according to claim 4, characterized in that: The specific way of overvoltage test in step S3 is: Switch K1 to ON position, short circuit VR1, the upper voltage dividing resistor will become smaller, causing the 5 pin VCC voltage to rise, when the voltage exceeds the VCC overvoltage protection voltage, the chip will shut down the output, there is no waveform output at the 7 pin and the 8 pin, observe the oscilloscope, when there is no waveform at the 7 pin and the 8 pin, the corresponding 5 pin VCC voltage is the overvoltage of the chip, record the voltage at this time.

6. The power supply chip on-off impedance and under-voltage and over-voltage test tool for an electric meter according to claim 5, characterized in that: The specific way of undervoltage test in step S3 is: The switch K1 is set to NC position, short circuit VR2, the lower voltage dividing resistor will be smaller, resulting in 5 pin VCC voltage will be reduced, when the voltage low voltage VCC undervoltage protection voltage, the chip will shut off output, 7 feet and 8 feet no waveform output, observation oscilloscope, 7 feet and 8 feet no waveform when the corresponding 5 feet VCC voltage is the chip undervoltage voltage, record the voltage at this time.

7. The power supply chip on-off impedance and under-voltage and over-voltage test tool for an electric meter according to claim 6, characterized in that: The specific way of the chip conduction impedance test in the step S4 is: The switch K1 is set to COM position, 5 feet VCC voltage normal power supply, switch K2 is set to ON end, short circuit 1 feet CS resistor, let the current through the chip can reach the maximum, K3 is set to COM feet, chip 7 feet and 8 feet break resistor R5 and R6, in VD end again connect a DC source, set chip conduction impedance test condition 5V and 0.5A, first open the first DC power supply, let 5 feet VCC normal power supply, then open the DC power supply connected at VD, at this time, chip 7 feet and 8 feet will start output voltage waveform, current probe on the current waveform at the same time, read the first voltage waveform average voltage value and the corresponding first current waveform current average value, voltage value divided by current value is the chip conduction resistance value.

Images