TWI404961B - Device for testing charge function of electronic products - Google Patents

Abstract

The present invention relates to a device for testing charge function of electronic products including a first switch, a second switch, and a reset chip. The first switch is provided for switching the output voltage and generating sounds. The second switch is electrically connected with the first switch to get a charging voltage. The second switch is electrically connected with a electronic product for charging the electronic product and getting a voltage value from a battery port of the electronic product. The reset chip is electrically connected with the second switch for getting a voltage value from battery port of the electronic products. The reset chip is electrically connected with the first switch for judging whether or not send a reset signal to the first switch to trigger it switching the charge voltage and generating sounds.

Description

Electronic product charging function test device

The invention relates to an electronic product charging function testing device, in particular to an electronic product charging function testing device with an overvoltage protection function.

With the rapid development of technology, more and more electronic products appear in people's daily lives, such as mobile phones, PDA (Personal Digital Assistant), laptops, etc., which have become important communication and entertainment in people's lives. tool. At present, most of the electronic products have a charging function, and the electronic products need to undergo a charging test before leaving the factory to check whether the charging function of the product is normal.

However, the conventional electronic product charging function test device usually does not have an overvoltage protection function, and the electronic product is easily damaged or destroyed during the test.

In view of this, it is necessary to provide an electronic product charging function testing device with overvoltage protection function.

An electronic product charging function testing device includes a first switching device, a second switching device and a reset chip, and the first switch is switched The second switch switching device is electrically connected to the first switch switching device to obtain a charging voltage, and the second switch switching device is electrically connected to the electronic product to charge the electronic product and acquire the electronic device. a voltage value of the battery port of the product; the input end of the reset chip is electrically connected to the second switch switching device to obtain a voltage value of the battery port of the electronic product, and the reset end of the reset chip is electrically connected to the first switch switching device, And determining, according to the voltage value of the battery port of the obtained electronic product, whether a reset signal is generated to the first switch switching device to trigger the first switch switching device to switch the charging voltage and emit a prompt tone.

Compared with the prior art, the electronic product charging function testing device can test whether the charging function of the electronic product is normal, and when the battery port voltage value of the electronic product reaches the overvoltage protection value, a reset signal is triggered by resetting the wafer. The first switch switching device switches the charging voltage and emits a prompt tone to implement overvoltage protection of the electronic product during the test.

100‧‧‧Electronic product charging function test device

10‧‧‧First switch switching device

11‧‧‧First relay

111‧‧‧Second COMMON pin

112‧‧‧Second NC pin

113‧‧‧Second NO pin

114‧‧‧First NO pin

115‧‧‧First NC pin

116‧‧‧First COMMON pin

12‧‧‧ First Triode

R1‧‧‧first resistance

R2‧‧‧second resistance

R3‧‧‧ third resistor

123‧‧‧First control terminal

20‧‧‧Second switchgear

21‧‧‧Second relay

211‧‧‧First COMMON pin

212‧‧‧Second NO pin

213‧‧‧First NO pin

214‧‧‧Second COMMON pin

22‧‧‧Second triode

R4‧‧‧fourth resistor

23‧‧‧second control terminal

30‧‧‧Charge and discharge circuit

C‧‧‧ capacitor

R5‧‧‧ fifth resistor

40‧‧‧Reset wafer

50‧‧‧Control unit

60‧‧‧Electronic products

61‧‧‧Battery port

62‧‧‧Charging port

1 is a functional block diagram of a preferred embodiment of an electronic product charging function testing device of the present invention for testing an electronic product.

2 is a partial circuit diagram of a preferred embodiment of the electronic product charging function testing device of the present invention.

The invention discloses an electronic product charging function testing device, which can be used for performing a charging function test on an electronic product having a charging port and a battery port, such as a mobile phone, a PDA, a notebook computer, and the like.

Referring to FIG. 1, a preferred embodiment of the electronic product charging function testing device of the present invention is used to test whether the charging function of an electronic product 60 is normal. The electronic product charging function testing device 100 includes a first switching device 10, a second switching device 20, a charging and discharging circuit 30, a reset wafer 40, and a control unit 50. The first switch switching device 10 is electrically connected to the second switch switching device 20 . The second switch switching device 20 is electrically connected to one end of the reset wafer 40 via the charge and discharge circuit 30 , and the other end of the reset wafer 40 is electrically connected to the first switch switching device 10 . The control unit 50 is electrically connected to the second switch switching device 20. The electronic product 60 includes a battery port 61 and a charging port 62. The battery port 61 is electrically connected to the control unit 50 and the second switch switching device 20, and the charging port 62 is electrically connected to the second switch switching device 20.

Referring to FIG. 2, the first switch switching device 10 is configured to switch the charging voltage of the electronic product 60 and emit a prompt tone when the test is successful. The first switch switching device 10 includes a first relay 11, a first resistor R1, a second resistor R2, a first transistor 12, a third resistor R3, and a first control terminal 123. The first relay 11 includes a V _CC pin, a GND pin, a first COMMON pin 116, a second COMMON pin 111, a first NC pin 115, a second NC pin 112, and a first A first NO pin 114 and a second NO pin 113. The V _CC pin of the first relay 11 is used to access an operating voltage, which is electrically connected to the first COMMON pin 116. The GND pin of the first relay 11 is electrically connected to the collector of the first transistor 12. The second COMMON pin 111 is used to be electrically connected to the second switching device 20. The first NC pin 115 is electrically connected to the second NC pin 112. The first resistor R1 and the second resistor R2 are connected in series between the first NO pin 114 of the first relay 11 and the ground. A node X is disposed between the first resistor R1 and the second resistor R2, and the node X is electrically connected to the second NO pin 113 of the first relay 11. The base of the first transistor 12 is electrically connected to the third resistor R3, and the emitter is grounded. The other end of the third resistor R3 is a first control terminal 123 electrically connected to the reset wafer 40 for receiving a reset signal from the reset wafer 40.

The first relay 11 has a first operating mode and a second operating mode, and performs switching of the operating mode according to the reset signal received by the first control terminal 123. When the first relay 11 is in the first working mode, the first COMMON pin 116 is turned on with the first NC pin 115, the second COMMON pin 111 is turned on with the second NC pin 112, and the current is led by the first COMMON. The pin 116 flows to the first NC pin 115 and then flows through the second NC pin 112 to the second COMMON pin 111. At this time, the output voltage of the second COMMON pin 111 is the operating voltage.

When the first control terminal 123 of the first switch switching device 10 inputs a reset signal, the first relay 11 switches to the second working mode and emits a beep. At this time, the first COMMON pin 116 is disconnected from the first pin NC115 and is turned on with the first NO pin 114; the second COMMON pin 111 is disconnected from the second NC pin 112, and the second NO is cited. The pin 113 is turned on; the current flows from the first COMMON pin 116 to the first NO pin 114, and then flows through the second NO pin 113 to the second COMMON pin 111. Due to the voltage division of the first resistor R1 and the second resistor R2, the output voltage of the second COMMON pin 111 of the first relay 11 is converted into the voltage across the second resistor R2, and the first resistor R1 and the first resistor can be controlled. The ratio R1/R2 of the two resistors R2 adjusts the output voltage of the second COMMON pin 111. When the first relay 11 is in the second mode of operation, its second COMMON pin The output voltage of 111 is lower than the overvoltage protection value of the electronic product 60.

The second switch switching device 20 is for electrically connecting to the electronic product 60 to charge the electronic product 60 and to obtain the battery voltage of the battery port 61 of the electronic product 60. The second switch switching device 20 includes a second relay 21, a second transistor 22, a fourth resistor R4 and a second control terminal 23. The second relay 21 includes a V _CC pin, a GND pin, a first COMMON pin 211, a second COMMON pin 214, a first NO pin 213, and a second NO pin 212. The V _CC pin of the second relay 21 is used to access an operating voltage. The GND pin of the second relay 21 is electrically connected to the emitter of the second transistor 22. The first COMMON pin 116 is used to connect the battery port 61 of the electronic product. The second COMMON pin 214 is electrically connected to the second COMMON pin 111 of the first relay 11. The first NO pin 213 is used to connect the charging port 62 of the electronic product 60. The base of the second transistor 22 is electrically connected to one end of the fourth resistor R4, and the emitter is grounded. The other end of the fourth resistor R4 is the second control terminal 23. The second control terminal 23 is used to connect to the control unit 50 to receive the control signal sent by the control unit 50 to control the start or stop of the test.

When the second control terminal 23 receives a test start control signal, the second relay 21 is activated, and the second COMMON pin 214 is turned on with the first NO pin 213, and the first COMMON pin 211 and the second NO pin are turned on. 212 is turned on, and the electronic products start to charge. The charging current flows from the first COMMON pin 211 of the first relay 11 to the second COMMON pin 214 of the second relay 21, and then flows to the first NO pin 213 of the second relay 21 to enter the charging port 62 of the electronic product. The charging current flows to the battery port 61 via the charging circuit of the electronic product 60, and then flows through the second relay. The first COMMON pin 211 of the appliance 21 eventually flows to the second NO pin 212 of the second relay 21. That is, the output voltage of the first COMMON pin 211 of the first relay 11 is the charging voltage of the charging port 62 of the electronic product 60; the output voltage of the second NO pin 212 of the second relay 21 is the battery port 61 of the electronic product 60. The voltage.

The charge and discharge circuit 30 is for taking the battery voltage of the electronic product 60 and protecting the reset wafer 40 during the voltage change of the battery port 61 thereof. The charge and discharge circuit 30 includes a capacitor C in parallel and a fifth resistor R5. The capacitor C and the fifth resistor R5 are grounded. The charge and discharge circuit 30 is electrically connected to the second NO pin 212 of the second relay 21 of the second switch switching device 20. After the second switch switching device 20 is started in the test, the voltage of the second NO pin 212 is applied. On the capacitor C, that is, the voltage of the second NO pin 212 is equal to the voltage of the battery port 61 of the electronic product 60, and the capacitor C is charged and discharged as the voltage of the electronic product battery port 61 changes.

The reset wafer 40 includes an input terminal V _DD , a reset terminal RESET and a ground terminal GND . The input terminal V _{DD of} the reset wafer 40 is electrically connected to the second switch switching device 20 , and the reset terminal RESET is electrically connected to the first control terminal 123 of the first switch switching device 10 . The reset wafer 40 has a threshold voltage that is lower than the overvoltage protection value of the electronic product 60. In the present embodiment, the threshold voltage of the reset wafer 40 is 4V. When the input voltage of the input terminal V _DD of the reset chip 40 is greater than the threshold voltage of 4V, the reset terminal RESET sends a reset signal to the first switch switching device 10 to trigger the first switch switching device 10 to switch to the second working mode, so that the first The output voltage of the switching device 10 is switched below the overvoltage protection value of the electronic product 60 to avoid damage to the electronic product 60 due to overvoltage charging. In this embodiment, the reset signal is a high level reset signal.

The control unit 50 is electrically connected to the second control terminal 23 of the second switching device 20 and the battery port 61 of the electronic product 60. The control unit 50 is a control device such as a computer or a single chip microcomputer, and is configured to input a test start control signal or a test stop control signal to the second control terminal 23 to control the start or stop of the test, and to determine the electronic product 60. Whether the charging function is normal. In this embodiment, the test start control signal is a high level control signal, and the test stop control signal is a low level control signal.

For testing, 11 of the first relay and the second relay pins V _CC V 21 of the access pin is a _CC operating voltage, the battery terminals 60, 61 electrically connected to the electronic products of the second relay 21 of the first lead COMMON The pin 211 and the control unit 50, the charging port 62 is electrically connected to the first NO pin 213 of the second relay 21.

Then, the test start control command is input through the operation control unit 50, and the control unit 50 sends a high level control signal to the second control terminal 23 of the second switch switching device 20, and the second transistor 22 is turned on, and the current passes through the second third. After the pole tube 22 is enlarged, the second relay 21 is driven to start, and the electronic product 60 starts to be charged. The charging current flows to the second NC pin 112 via the first COMMON pin 116 of the first relay 11, the first NC pin 115, and finally flows to the second relay 21 via the second COMMON pin 111 of the first relay 11. The second COMMON pin 214 enters the charging port 62 of the electronic product 60 via the first NO pin 213 of the second relay 21, and flows to the battery port 61 via the charging circuit of the electronic product 60 to charge the battery of the electronic product 60, and finally Flowing to the second NO pin 212 of the second relay 21 for acquisition The voltage of the battery port 61 of the electronic product 60. During the charging process, communication between the control unit 50 and the electronic product 60 is performed, and the control unit 50 sends a command to the electronic product 60 to inquire about the charging current value of its charging port 62. If the electronic product 60 has the function of reporting the charging current value, that is, the electronic product 60 can report the charging current value to the control unit 50, and after receiving the charging current value reported by the electronic product 60, the control unit 50 determines the electronic product 60 based on the charging current value. Whether the charging is successful. If it is determined that the charging of the electronic product 60 is unsuccessful, it indicates that the charging function of the electronic product 60 is abnormal. At this time, the control unit 50 generates a test stop control signal, and transmits the test stop control signal to the second control terminal 23 to stop. test. If it is judged that the electronic product 60 is successfully charged, as the electronic product 60 is continuously charged, the voltage of the battery port 61 is continuously increased. When the voltage of the battery port 61 exceeds the threshold voltage of the reset wafer 40, the reset wafer 40 generates a reset signal and transmits the reset signal to the first switch switching device 10. At this time, the first switch switching device 10 switches to the second operation mode, and the output voltage thereof is switched to the overvoltage protection value of the electronic product 60, and a prompt tone is issued to indicate that the electronic product 60 is successfully charged, that is, the charging function of the electronic product 60 is normal. . At this time, the tester can input the stop test command by operating the control unit 50 to stop the test.

When the functional electronic product 60 having the reported charging current value causes the return charging current value to expire due to an abnormality, or the electronic product 60 does not have the function of returning the charging current value, if the charging function of the electronic product 60 is normal, the electronic product 60 continuously When it is charged, the voltage of its battery port 61 is constantly increasing. When the voltage of the battery port 61 exceeds the threshold voltage of the reset wafer 40, the reset wafer 40 generates a high level reset signal and transmits the high level reset signal to the first switch switching device 10. . At this time, the first switch switching device 10 is switched to the second operation mode, and the input voltage of the first switch switching device 10 is switched to the overvoltage protection value of the electronic product 60, and a prompt tone is issued to indicate that the electronic product 60 is successfully charged, that is, the electronic The charging function of the product 60 is normal. At this time, the tester can stop the test by operating the control unit 50.

In the above process, if the charging function of the electronic product 60 is not normal, the charging current cannot flow to the battery port 61, and the input voltage of the resetting chip 40 does not exceed its threshold voltage, which does not generate a reset signal to the first switching device 10. Therefore, there is no prompt tone during the test.

It can be understood that the first transistor 12 and the second transistor 22 can be other amplifier components, such as a field effect transistor.

It can be understood that the charge and discharge circuit 30 can be omitted, that is, the reset terminal RESET of the reset wafer 40 is electrically connected to the second NO pin 212 of the second switch switching device 20.

The electronic product charging function testing device 100 controls the start and stop of the test by the control unit 50, and realizes switching of the charging voltage by using the switching switching characteristics of the first relay 11 and the second relay 21 and the reset action of the reset wafer 40, and the charging is successful. The prompt function and stabilize the charging voltage below the overvoltage protection value of the electronic product to prevent the electronic product from being damaged or destroyed during the test.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art can assist in the present invention. Equivalent modifications or variations made by the spirit of the Ming Dynasty shall be covered by the following patent application.

100‧‧‧Electronic product charging function test device

10‧‧‧First switch switching device

20‧‧‧Second switchgear

30‧‧‧Charge and discharge circuit

40‧‧‧Reset wafer

50‧‧‧Control unit

60‧‧‧Electronic products

61‧‧‧Battery port

62‧‧‧Charging port

23‧‧‧First control terminal

123‧‧‧Second console

211‧‧‧First COMMON pin

213‧‧‧First NO pin

Claims (10)

An electronic product charging function testing device for performing charging function testing on an electronic product having a charging port and a battery port, wherein the electronic product charging function testing device comprises a first switching device and a second switching device And a resetting chip; the first switch switching device is configured to output a charging voltage and emit a prompt tone; the second switch switching device is electrically connected to the first switch switching device to obtain a charging voltage, and the second switch switching device and the electronic product Electrically connecting to charge the electronic product and obtain a voltage value of the battery port of the electronic product; the input end of the reset chip is electrically connected to the second switch switching device to obtain a voltage value of the battery port of the electronic product; and the reset end of the reset chip Electrically connecting with the first switch switching device, and determining, according to the voltage value of the battery port of the obtained electronic product, whether a reset signal is generated to the first switch switching device to trigger the first switch switching device to switch the charging voltage and emit a prompt tone . The electronic product charging function testing device of claim 1, wherein the first switching device comprises a first relay, a first resistor and a second resistor, the first relay comprising a V _CC pin a GND pin, a first COMMON pin, a second COMMON pin, a first NC pin, a second NC pin, a first NO pin, and a second NO pin; _{The CC} pin is used to connect to the working voltage, and is electrically connected to the first COMMON pin, the GND pin is used for accessing a control signal; the second COMMON pin is electrically connected to the second switch switching device, first The NC pin is electrically connected to the second NC pin, the first resistor and the second resistor are connected in series between the first NO pin of the first relay and the ground; and a first resistor and the second resistor are disposed between the first resistor and the second resistor a node electrically connected to the second NO pin of the first relay. The electronic product charging function testing device of claim 2, wherein the first relay comprises a first control end, and the first relay has a first working mode and a second working mode, which may be according to the first The reset signal received by a control terminal is switched between the first working mode and the second working mode. The electronic product charging function testing device according to claim 3, wherein when the first relay is in the first working mode, the first COMMON pin is turned on with the first NC pin, and the second COMMON pin is connected to the second The NC pin is turned on, and the output voltage is the working voltage; when the first relay is in the second working mode, the first COMMON pin is turned on with the first NO pin, and the second COMMON pin is turned on with the second NO pin, and the output voltage is The voltage across the second resistor. The electronic product charging function testing device of claim 4, wherein the first switching device further comprises a first amplifying device and a third resistor; the third resistor is connected to the first amplifying device at one end, and One end is a first control end, and the first control end is electrically connected to the reset end of the reset chip, and is configured to receive a reset signal to trigger the first switch switching device to switch the charging voltage and emit a prompt tone, the first amplifier component and the first The GND pin of the relay is electrically connected, and the first amplifying device amplifies the control signal and outputs the signal. The electronic product charging function testing device of claim 1, wherein the second switching device comprises a second relay, the second relay comprising a V _CC pin, a GND pin, and a first COMMON a pin, a second COMMON pin, a first NO pin, and a second NO pin; the V _CC pin is used to access an operating voltage, and the GND pin is used to access a control signal, the first COMMON The pin is used to connect the battery port of the electronic product, the first NO pin is used to connect the charging port of the electronic product, and the second COMMON pin is electrically connected to the second COMMON pin of the first relay. The electronic product charging function testing device of claim 6, wherein the second switching device further comprises a second amplifying device and a fourth resistor, the fourth resistor being connected to the second amplifying device at one end, and One end is a second control end, and the control end is configured to receive a control signal; the second amplifying device is electrically connected to a GND pin of the second relay, and the second amplifying device amplifies the control signal and outputs the signal. The electronic product charging function testing device according to claim 1, wherein the reset wafer has a threshold voltage lower than an overvoltage protection value of the electronic product, and when an input voltage of the input terminal of the reset chip is greater than a threshold voltage, The reset terminal sends a reset signal to the first switch switching device. The electronic product charging function testing device according to claim 1, further comprising a control unit electrically connected to the second switch switching device and the battery port of the electronic product, wherein the control unit is used for The two switch switching device inputs a test start control signal or a test stop control signal to control the start or stop of the test, and is used to determine whether the electronic product charging function is normal. The electronic product charging function testing device of claim 1, further comprising a charging and discharging circuit, the charging and discharging circuit comprising a capacitor connected in parallel and a fifth resistor, the charging and discharging circuit being grounded, one end and the first Two relays are electrically connected.