WO2019237367A1

WO2019237367A1 - Test circuit and test system

Info

Publication number: WO2019237367A1
Application number: PCT/CN2018/091694
Authority: WO
Inventors: 田晨
Original assignee: Oppo广东移动通信有限公司
Priority date: 2018-06-15
Filing date: 2018-06-15
Publication date: 2019-12-19

Abstract

A test circuit and a test system. The test circuit comprises an electronic load (20) and a capacitor module (30). The electronic load (20) comprises a first input end (201) and a second input end (202). The first input end (201) is used for connecting to a first output end (101) of a charging device (10). The second input end (202) is used for connecting to a second output end (102) of the charging device (10). The electronic load (20) is used for testing a pulse signal outputted by the charging device (10). The capacitor module (30) is provided between the first input end (201) and the second input end (202). When the voltage of the pulse signal outputted by the charging device (10) is lower than a first voltage threshold, the capacitor module (30) is used for supplying power to the charging device (10). When the electronic load (20) is used for testing the pulse signal outputted by the charging device (10) and when the voltage of the pulse signal is lower than the first voltage threshold, the capacitor module (30) can supply power to the charging device (10) so that the power to the charging device (10) is uninterrupted, thus allowing a test to be completed successfully.

Description

Test circuit and test system

Technical field

The present application relates to the field of test technology, and in particular, to a test circuit and a test system.

Background technique

With the development of network technology and the improvement of the intelligence of electronic devices, users can realize more and more functions through electronic devices, such as calling, chatting, and playing games. At the same time, the display of electronic devices is getting larger and larger, and the display effect is getting better and better. Users have been using electronic devices for longer and longer times. In order to make it easier for users to use electronic devices, the capacity of electronic device batteries is also getting larger and larger, and this brings about a problem, that is, the battery charging time of electronic devices. It's getting longer.

Users have been using charging devices (such as adapters) to charge electronic devices for longer and longer, and safety requirements for charging devices have also increased. Therefore, it is necessary to test the charging device for charging the electronic device to ensure the quality of the charging device.

Summary of the Invention

The embodiments of the present application provide a test circuit and a test system, which can make the process of testing the charging device uninterrupted.

An embodiment of the present application provides a test circuit, including:

The electronic load includes a first input terminal and a second input terminal. The first input terminal is used to connect a first output terminal of the charging device, and the second input terminal is used to connect a first input terminal of the charging device. Two output terminals, the electronic load is used to test the pulsation signal output by the charging device;

A capacitor module disposed between the first input terminal and the second input terminal, when the voltage of the pulse signal output by the charging device is lower than a first voltage threshold, the capacitor module For powering the charging device.

The embodiment of the present application further provides a test system, which includes:

Electronic load, the electronic load includes a first input terminal and a second input terminal, the first input terminal is used for connecting the first output terminal of the charging device, and the second input terminal is used for connecting the second output of the charging device Terminal, the electronic load is used to test the pulsation signal output by the charging device;

A charging device including a first output terminal and a second output terminal, and the charging device outputs a pulsation signal;

A testing device comprising an electronic load and a capacitor module;

The electronic load includes a first input terminal and a second input terminal, the first input terminal is connected to a first output terminal of the charging device, the second input terminal is connected to a second output terminal of the charging device, and the electronic load test A pulsation signal output by the charging device;

The capacitor module is disposed between the first input terminal and the second input terminal. When the voltage of the pulse signal output by the charging device is lower than a first voltage threshold, the capacitor module charges the battery. Device powered.

The test circuit provided in the embodiment of the present application includes an electronic load and a capacitor module. The electronic load is connected to a charging device, and the capacitor module is disposed between the first input terminal and the second input terminal of the electronic load. The electronic load is used to test the pulsation signal output by the charging device. When the voltage of the pulsation signal is lower than the first voltage threshold, the charging device will be powered off, causing the test to fail. At this time, the capacitor module can supply power to the charging device to Keep the charging device powered. When the voltage of the pulsation signal is higher than the first voltage threshold, the capacitor module is charged, and the electronic load tests the pulsation signal. In this way, when the charging device is tested on the production line, the battery without the electronic device can still be tested on the charging device. In addition, the capacitor module has the advantages of simple circuit, low cost, small size, and wide range of use, and has a small impact on the test. The electronic load can better test various parameters of the charging device, unlike the battery test, because the battery The state of the battery cannot be changed, and it is not possible to simulate various conditions (such as low battery, high battery, full battery) to test the charging device like an electronic load.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present application more clearly, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are just some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a test system provided by an embodiment of the present application.

FIG. 2 is another schematic structural diagram of a test system provided by an embodiment of the present application.

FIG. 3 is a first schematic diagram of a test circuit provided by an embodiment of the present application.

FIG. 4 is a second schematic diagram of a test circuit provided by an embodiment of the present application.

FIG. 5 is a third schematic diagram of a test circuit provided by an embodiment of the present application.

FIG. 6 is a fourth schematic diagram of a test circuit provided by an embodiment of the present application.

FIG. 7 is a fifth schematic diagram of a test circuit provided by an embodiment of the present application.

FIG. 8 is a schematic structural diagram of a charging device and an electronic device according to an embodiment of the present application.

FIG. 9 is a schematic flowchart of a test method provided in an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall into the protection scope of the present application.

In the description of this application, it should be understood that the terms “first” and “second” are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless it is specifically and specifically defined otherwise.

The embodiments of the present application provide a test circuit and a test system. Each will be described in detail below.

The functions of electronic devices such as smart phones are getting stronger and stronger, the display screen is getting bigger and larger, and users have been using electronic devices for longer and longer. In order to make it easier for users to use electronic devices, the battery capacity of electronic devices is also increasing. The bigger the battery takes longer to charge. In order to solve the problem that the charging time of the battery is too long, a fast charging (flash charging) technology has appeared, which can quickly charge the battery.

Please refer to FIG. 1, which is a schematic structural diagram of a test system provided by an embodiment of the present application. The charging device 10 of this embodiment includes a charging receiving end 1001, a voltage adjustment circuit 1002, and a central control module 1003.

The charging receiving end 1001 is configured to receive AC mains power. The input terminal of the voltage adjustment circuit 1002 is connected to the charging receiving terminal 1001, the output terminal of the voltage adjustment circuit 1002 is connected to the electronic load 20, and the voltage adjustment circuit 1002 is used to adjust the AC mains to output the voltage of the pulsating waveform, and The waveform voltage is directly applied to the electronic load 20. The central control module 1003 is configured to control the voltage adjustment circuit to adjust the output voltage and / or current of the voltage adjustment circuit in response to the test demand of the electronic load 20.

Please refer to FIG. 2 and FIG. 3. FIG. 2 is another schematic structural diagram of a test system provided by an embodiment of the present application, and FIG. 3 is a first schematic diagram of a test circuit provided by an embodiment of the present application. The charging device 10 may include a first rectifying unit 101, a switching unit 102, a transformer 103, a second rectifying unit 104, a first charging interface 105, a sampling unit 106, and a control unit 107.

The first rectifying unit 101 rectifies an input alternating current (commercial power, such as AC220V) to output a voltage of a first pulsating waveform, such as a hoe wave voltage. The first rectifying unit 101 may be a full-bridge rectifier circuit composed of four diodes. The switching unit 102 is configured to modulate the voltage of the first pulsating waveform according to the control signal. The switching unit 102 may be composed of a MOS tube, and performs PWM (Pulse Width Modulation) control on the MOS tube to modulate the hob wave voltage. Chopper modulation.

In some embodiments, the transformer 103 may include a primary winding and a secondary winding, one end of the primary winding is connected to the first output terminal of the first rectifying unit 101, the second output terminal of the first rectifying unit 101 is grounded, and the other of the primary winding is One end is connected to the switching unit 102 (for example, if the switching unit 102 is a MOS tube, then the other end of the primary winding is connected to the drain of the MOS tube). The transformer 103 is used to adjust the voltage of the first pulse waveform after modulation. Outputs the voltage of the second pulsating waveform. Among them, the transformer 103 is a high-frequency transformer, and its working frequency may be 50KHz-2MHz. The high-frequency transformer couples the voltage of the modulated first pulse waveform to the secondary, and the secondary winding outputs the voltage. In the embodiment of the present application, a high-frequency transformer is used. Compared with a low-frequency transformer (a low-frequency transformer is also referred to as a power-frequency transformer), the high-frequency transformer is mainly used to refer to the frequency of a commercial power source, such as 50Hz or 60Hz AC The small size makes it possible to reduce the size of the charging device 10.

The second rectifying unit 104 is connected to the secondary winding of the transformer 103. The second rectifying unit 104 is configured to rectify the voltage of the second pulsating waveform to output the voltage of the third pulsating waveform. Wherein, the second rectifying unit 104 may include a diode or a MOS tube, which can implement secondary synchronous rectification, so that the third pulsating waveform is synchronized with the modulated first pulsating waveform. It should be noted that the third pulsating waveform and the modulated The first pulsation waveform remains synchronized, specifically, the phase of the third pulsation waveform is consistent with the phase of the modulated first pulsation waveform, and the amplitude of the third pulsation waveform and the amplitude of the first pulsation waveform after modulation remain the same. Consistent. The first charging interface 105 is connected to the second rectification unit 104, and the sampling unit 106 is configured to sample the voltage and / or current on the primary winding, that is, to sample the voltage of the modulated first pulse waveform, so as to achieve primary sampling. The control unit 107 is respectively connected to the sampling unit 106 and the switching unit 102. The control unit 107 outputs a control signal to the switching unit 102, and calculates a voltage corresponding to the output of the second rectification unit according to the voltage value and / or the current value sampled by the sampling unit 106. The voltage sampling value and / or current sampling value, that is, the calculated voltage sampling value and / or current sampling value correspond to the output of the second rectifier unit, are the output voltage and / or output current of the charging device, and are based on the voltage sampling value and / Or the current sampling value adjusts the duty cycle of the control signal, so that the voltage of the third pulsating waveform output by the second rectifying unit 104 can meet the charging requirement. The pulsating output voltage and / or current directly fast-charges the battery. Among them, the magnitude of the output voltage and / or output current of the third pulsating waveform is periodically changed. Compared with the traditional constant voltage and constant current, it can reduce the lithium precipitation of the lithium battery, improve the battery life, and reduce the charging. The probability and strength of the arcing of the contacts of the interface improve the life of the charging interface, as well as reduce the polarization effect of the battery, increase the charging speed, reduce the heating of the battery, and ensure the safety and reliability of the terminal when charging. In addition, because the power adapter outputs a voltage with a pulsating waveform, there is no need to set an electrolytic capacitor in the charging device (power adapter), which can not only simplify and miniaturize the charging device (power adapter), but also greatly reduce costs.

When the charging device is tested on the production line, the embodiment of the present application uses an electronic load to test the charging device. The electronic load is a device that consumes electrical energy by controlling the internal power (MOSFET) or the conduction of the transistor (the amount of the duty cycle) and relying on the power dissipated by the power tube. It can accurately detect the load voltage, precisely adjust the load current, and at the same time, it can realize an analog load short circuit.

Electronic load has perfect protection function. Protection functions include internal (electronic load) protection and external (device under test) protection. Internal protection includes: over voltage protection, over current protection, over power protection, voltage reverse and over temperature protection. External protection includes: overcurrent protection, overpower protection, load voltage and low voltage protection.

Since the electronic load can provide a powerful test environment to meet different external requirements, it is very suitable for testing charging devices, especially for production line testing. It can provide various test environments to test the various performances of the charging device. The electronic load may include at least one of four functions: constant current, constant voltage, constant resistance, and constant power.

Please refer to FIG. 4, which is a second schematic diagram of a test circuit provided by an embodiment of the present application. The test circuit includes an electronic load 20 and a capacitor module 30.

The electronic load 20 includes a first input terminal 201 and a second input terminal 202. The first input terminal 201 is used to connect the first output terminal 101 of the charging device 10, and the second input terminal 202 is used to connect The second output terminal 102 of the charging device 10 is used for testing the pulse signal output by the charging device. The first input terminal 201 is used for transmitting electrical signals, and the second input terminal 202 is grounded.

The capacitor module 30 is disposed between the first input terminal 201 and the second input terminal 202. When the voltage of the pulse signal output by the charging device 10 is lower than the first voltage threshold, the capacitor module 30 is used for To power the charging device 10.

When the charging device 10 is tested, because the charging device 10 outputs a pulsation signal, that is, the charging device 10 outputs the third pulsating waveform described above. The voltage of the pulsation signal is fluctuating, that is, the pulsation signal includes a peak voltage value (maximum voltage value) and a valley voltage value (minimum voltage value). The voltage of the pulsation signal fluctuates between the peak voltage value and the valley voltage value. . When the charging device 10 directly charges the battery of the electronic device, if the voltage in the pulsation signal is lower than a certain value (such as when the voltage of the pulsation signal is lower than 2.8V), the voltage of the pulsation signal will be back-injected by the battery voltage. Therefore, the charging device 10 is continuously powered. When the voltage of the pulsation signal is higher than a certain value (such as when the voltage of the pulsation signal is higher than 2.8V), the pulsation signal charges the battery.

However, in the production line test, if the battery is used for testing, it cannot accurately simulate the various states of the battery for testing, such as low battery, medium power, high power, full power, etc., only one kind of battery can be tested. The test results cannot meet the needs. Or you need to replace multiple batteries with different power, increase the operation steps, tedious operation, and easy to mix up, causing test failure, need to re-test, low efficiency and error-prone. In addition, during the test process, the batteries with different power levels constantly change their power levels, which need to be periodically checked and discharged, which is inconvenient to use. For a large number of charging devices 10 to be tested on a production line, the above problems are difficult to solve, which seriously affects efficiency. Therefore, the electronic load 20 needs to be used for testing, and the electronic load 20 is used to simulate various states of the battery, so that it can be tested smoothly, quickly and completely.

Using the electronic load 20 test, the inventor found during actual testing that when the pulsating signal voltage output by the charging device 10 is lower than the first voltage threshold (such as 2.8V), the charging device 10 is powered off, so that the normal test cannot be performed. Specifically, because the input of the charging device 10 is AC power, and the charging device 10 directly charges the battery, when the AC power is low voltage, multiple components inside the charging device 10 cannot supply power, which in turn causes multiple components inside the charging device 10 to fail. Work, causing the charging device to fail to work properly. After a long period of research and a large number of experiments, the inventor has added a capacitor module 30 between the first input terminal 201 and the second input terminal 202 of the electronic load 20 to solve the problem. When the voltage of the pulsation signal output by the charging device 10 is lower than the first voltage threshold, the capacitor module 30 is used to supply power to the charging device 10 so that multiple components inside the charging device 10 continue to work.

Specifically, when the voltage of the pulsation signal output by the charging device 10 is higher than or equal to the first voltage threshold, the pulsation signal output by the charging device 10 charges the capacitor module 30, and the pulsation pulse is also input to the electronic load 20 for testing. Then, when the voltage of the pulsation signal output by the charging device 10 is lower than the first voltage threshold, the voltage of the capacitor module 30 is higher than the voltage of the pulsation signal, and the capacitor module 30 supplies power to the charging device 10.

It should be noted that a detection module can be integrated in the electronic load 20, and the detection module can detect the current, voltage, etc. of the electric signal input to the electronic load 20.

In some embodiments, the capacitor module 30 may include only one capacitor. One end of the capacitor is connected to the first input terminal 201 of the electronic load 20, and the other end of the capacitor is connected to the second input terminal 202 of the electronic load 20.

Please refer to FIG. 5, which is a third schematic diagram of a test circuit provided by an embodiment of the present application. In some embodiments, the capacitor module 30 may include at least two capacitors connected in parallel, one end of the at least two parallel capacitors is connected to the first input terminal 201 of the electronic load 20, and the other end of the at least two parallel capacitors is connected The second input terminal 202 of the electronic load 20. The capacitance of the capacitor module 30 can be achieved by combining two or more capacitors in parallel.

In some embodiments, the capacitance of the capacitor module is greater than 100 uF. The capacitor module needs to supply power to the charging device. Therefore, the electronic module needs a larger capacitance value. The capacitance value of the capacitor module can also be other values, such as 500uF, 800uF, 1000uF, 1500uF, 2000uF, and so on.

Please refer to FIG. 6, which is a fourth schematic diagram of a test circuit provided by an embodiment of the present application. The test circuit further includes a communication module 60 including a first communication port, the first communication port is used to connect with a second communication port of the charging device 10, and the communication module 60 is used to communicate with the The charging device 10 performs two-way communication, and the communication module detects a communication function of the charging device

The communication module 60 can be used to detect the communication function of the charging device 10. For example, the communication module 60 can first send a sending message to the charging device 10, and then receive the return information returned by it. Then, it is detected whether the transmitted information and the returned information match, thereby detecting whether the communication function of the charging device 10 is normal.

In some embodiments, the capacitor may be a variable capacitor. By changing the capacitance value of the capacitor to test with different charging devices 10, different charging modules of the charging device 10 can also be used. The charging mode includes a fast charging module and a normal charging mode. The charging mode may also include a constant current charging mode, a constant voltage charging model, a small current charging mode, a high current charging mode, and the like.

Wherein, when the charging device charges the battery of the electronic device, the supported charging modes may include a normal charging mode and a fast charging mode. The charging speed in the fast charging mode is greater than the charging speed in the normal charging mode (for example, the charging current in the fast charging mode is greater than the charging current in the normal charging mode). Generally speaking, the normal charging mode can be understood as a charging mode with a rated output voltage of 5V and a rated output current of 2.5A or less. In addition, in the normal charging mode, D + and D- in the data pin of the output port of the charging device can be short-circuited. . The fast charging mode in the embodiment of the present application is different. In the fast charging mode of the embodiment of the present application, the charging device can use D + and D- in the data line to communicate with the electronic device to implement data exchange, that is, the charging device and the electronic device. Fast charging instructions can be sent to each other: the charging device sends a fast charging inquiry instruction to the electronic device, and after receiving the fast charging response instruction of the electronic device, according to the response instruction of the electronic device, the charging device obtains the status information of the electronic device and turns on Fast charging mode. The charging current in the fast charging mode can be greater than 2.5A, for example, it can reach 4.5A or even more. However, the embodiment of the present application does not specifically limit the normal charging mode. As long as the charging device supports two charging modes, the charging speed (or current) of one charging mode is higher than the charging speed of the other charging mode, the charging speed is slower. The charging mode can be understood as a normal charging mode. Relative to the charging power, the charging power in the fast charging mode can be greater than or equal to 15W. During the test, the communication module can simulate the sending and receiving of instructions by the electronic device. The communication module simulates the communication between the electronic device and the charging device, and is used to test whether the voltage and current of the charging device in the fast charging module and the normal charging mode are qualified.

In some embodiments, the test circuit further includes a communication module 60 including a first communication port, and the first communication port is used to connect with the second communication port of the charging device 10;

The communication module 60 is configured to send control information, and the control information is used to control the charging device 10 to change an output electric signal;

The electronic load 20 includes a detection module, and the detection module is configured to detect a changed output electrical signal of the charging device 10.

The communication module 60 of the test circuit first sends a control message to the charging device 10, and then the electronic load 20 detects the output signal of the charging device 10, and then checks whether the voltage or current or frequency of the output signal of the charging device 10 matches the control information, thereby detecting Whether the communication function of the charging device 10 is normal or not, the performance of the charging device 10 is also detected. For example, the control information includes changing the voltage of the output signal, changing the peak value of the output voltage from 5V to 12V, the electronic load 20 detects the peak voltage of the output signal of the charging device 10, and if the peak voltage of the output signal changes from 5V to 12V, it indicates that charging The communication function of the device 10 is normal, and various parameters such as current, average voltage, frequency, etc. can be detected when the peak voltage of the output signal is 12V.

The electronic load is connected to a control computer, which controls the impedance and other parameters of the electronic load, and simultaneously obtains information such as voltage, current and frequency output by the electronic load detection and charging device. The control computer is also connected to a communication module. The control computer can simulate electronic equipment and send different control information to the charging device through the communication module. The control information can be information such as the battery value, temperature, and voltage of the analog electronic device, and is used to detect the reaction of the charging device to the low, medium, high, and full battery conditions, such as low battery Charging for small current, fast charging for medium power, constant current charging for high power, no charging at full power, etc. Among them, the low power can be less than 10% of the total power, the middle power is 10% -70% of the total power, the high power is 70% -98% of the total power, and the full power is 98% -100% of the total power. It can also be used to detect the response of the charging device to the low and high temperature of the battery, such as fast charging at low and high temperatures, intermittent charging at high temperatures, and so on. Among them, the low temperature and the high temperature differ depending on the type of the battery.

The control information may also be a voltage value, a current value, etc. required by the analog battery. Used to detect the response of the charging device to the voltage value required by the battery. If the battery needs to be 5V and the input voltage before the charging device is 9V, the charging device needs to reduce the output voltage of the pulsation signal to 5V.

After receiving the control information, the charging device changes the output pulsation signal according to the control information. The electronic load detects the pulsation information after changing the output, and obtains at least one of the test voltage value, the test current value, and the test frequency value from the pulsation information. The control computer obtains the reference voltage value and reference corresponding to the control information according to the pre-stored corresponding information. At least one of the current value and the reference frequency value, and then compare the test voltage value with the reference voltage value, the test current value with the reference current value, the test frequency value with the reference frequency value, and if the comparison result is within the range, such as both If the difference is within 5%, the charging device is determined to be qualified, otherwise the charging device is determined to be unqualified. Therefore, different performances such as whether the normal charging of the charging device is qualified, whether the fast charging is qualified, whether the over-voltage protection is qualified, and whether the over-current protection is qualified are tested.

Please refer to FIG. 7, which is a fifth schematic diagram of a test circuit provided by an embodiment of the present application. In some embodiments, the test circuit further includes a switch tube 40, and a communication module R1 and a second resistor R2 connected in series. The communication module R1 and the second resistor R2 connected in series are disposed on the first input terminal 201 and Between the second input terminal 202, a control terminal of the switch tube 40 is connected between the communication module R1 and the second resistor R2, and an input terminal of the switch tube 40 is used to connect the charging device 10 A second output terminal 102, the output of the switching tube 40 is connected to the second input terminal 202 of the electronic load 20, and the switching tube 40 is configured to switch the charging device 10 when the output voltage of the charging device 10 is greater than a second voltage threshold; An input terminal of the switch tube 40 is in communication with an output terminal of the switch tube 40.

A capacitor module 30 having a larger capacitance value may be connected between the first input terminal 201 and the second input terminal 202 of the electronic load 20 as a load to simulate a battery. Since the capacitor module 30 is in a short-circuit state with respect to the charging device 10, the charging device 10 can fully output the capacitor module 30 before it can stably output. However, when the electronic load 20 is tested in the constant current and constant resistance mode, if it is powered on with a load, that is, the electronic load 20 is connected to the power test, it will cause the electricity output from the charging device 10 to the capacitor module 30 to be full, resulting in charging. The device 10 has not been in a normal state. At this time, a switch tube 40 is further provided on the test circuit. After the capacitor module 30 is fully charged, the switch tube 40 is turned on and the electronic load 20 can draw current. With this switching tube 40, even if the device is powered on, the charging device 10 will first fully charge the capacitor module 30, and the charging device 10 will stabilize before drawing current to ensure that all modes of the production line can be tested.

Among them, by setting the ratio of the first electron and the second resistor R2, it can be set when the voltage at the output terminal of the charging device 10 reaches (for example, when 5V is reached) the switching tube 40 is turned on, thereby ensuring the capacitor module After 30 is full, the electronic load 20 can draw current.

The switching tube 40 may be a field effect transistor or a triode, which is not limited herein.

Please continue to refer to FIG. 4. In some embodiments, the test system includes an electronic load 20 and a capacitor module 30.

The electronic load 20 includes a first input terminal 201 and a second input terminal 202. The first input terminal 201 is used to connect the first output terminal 101 of the charging device 10, and the second input terminal 202 is used to connect the charging device. A second output terminal 102 of 10;

The capacitor module 30 is disposed between the first input terminal 201 and the second input terminal 202. When the voltage of the pulse signal output by the charging device 10 is lower than a first voltage threshold, the capacitor module 30 30 is used to power the charging device 10.

In some embodiments, the capacitor module includes a capacitor, a first terminal of the capacitor is directly connected to the first input terminal, and a second terminal of the capacitor is directly connected to the second output terminal.

A capacitor can be set directly between the first input terminal and the second input terminal of the electronic load. The capacitor has a large capacitance value, such as 100uF, 1000uF, etc., where the capacitor includes two pins, and the two pins are respectively It is directly connected to the first input terminal and the second output terminal. Two pins can also be connected to the first input terminal and the second output terminal through a wire. No additional substrate etc. are required.

In some embodiments, the capacitor module includes at least two capacitors connected in parallel, a first terminal of the two parallel capacitors is directly connected to the first input terminal, and a second terminal of the two parallel capacitors Directly connected to the second output terminal.

One end of each parallel capacitor is connected together, and the first input terminal is directly connected. The other end of each parallel capacitor is connected together, and the second input terminal is directly connected. Among them, the direct connection may be directly connected with a capacitor pin, or the capacitor pin may be connected through a wire.

In some embodiments, the detection device further includes a substrate, the capacitor module is disposed on the substrate, the substrate is provided with a first connection port and a second connection port, and the capacitor module is disposed on the substrate. Between the first connection port and the second connection port, the first connection port is used to connect a charging device, and the second connection port is connected to an electronic load.

The capacitor module is arranged on the substrate, and the substrate can carry the capacitor module well, and is not easy to be lost and damaged. The substrate may be a circuit board, and a pad is provided on the circuit board. The pad is used for welding the capacitor, the first connection port and the second connection port in the capacitor module. The circuit board is further provided with a connection capacitor, a first connection port, and a first connection port. The wiring of the connection port and the second connection port, which is a printed wire on a circuit board.

In some embodiments, the substrate is further provided with a switch tube, and a first resistor and a second resistor connected in series. The first resistor and the second resistor connected in series are disposed on the first input terminal and the second input. The control terminal of the switch tube is connected between the first resistor and the second resistor. The input terminal of the switch tube is used to connect the second output terminal of the charging device. The output terminal is connected to the second input terminal of the electronic load, and the switch tube is configured to connect the input terminal of the switch tube with the output terminal of the switch tube when the output voltage of the charging device is greater than a second voltage threshold. The elements in this embodiment are connected by printed wires on the substrate.

Please continue to refer to FIG. 4. In some embodiments, the test system includes a charging device 10 and a test device.

The charging device 10 includes a first output terminal 101 and a second output terminal 102. The charging device 10 outputs a pulsation signal.

The test device includes an electronic load 20 and a capacitor module 30.

The electronic load 20 includes a first input terminal 201 and a second input terminal 202. The first input terminal 201 is connected to the first output terminal 101 of the charging device, and the second input terminal 202 is connected to the second output of the charging device 10. At terminal 102, the electronic load tests the pulsation signal output by the charging device.

The capacitor module 30 is disposed between the first input terminal 201 and the second input terminal 202. When the voltage of the pulse signal output by the charging device 10 is lower than a first voltage threshold, the capacitor module 30 30 supplies power to the charging device 20.

The charging device 10 may be the charging device in the foregoing embodiment.

In some embodiments, the test device further includes a communication module. The control unit is connected to the first charging port, and the control unit is further configured to communicate with the communication module through the first charging port to obtain sending information of the communication module.

Specifically, the charging device and the electronic device may be connected through a universal serial bus (Universal Serial Bus, USB) interface. The USB interface may be a common USB interface, a microUSB interface, or a Type-C interface. The data pin in the USB interface is used for two-way communication between the charging device and the electronic device. The data pin may be a D + line and / or a D- line in the USB interface. The so-called two-way communication may refer to both the charging device and the electronic device. Interact with information.

Wherein, the charging device performs two-way communication with the electronic device through a data pin in the USB interface, so as to determine to use the fast charging mode to charge the electronic device.

In some embodiments, the control unit is further configured to adjust a duty cycle of the control signal according to the transmission information of the communication module and the electrical signal sampling value.

The electrical signal sampling value includes one or two of a voltage sampling value and a current sampling value.

It should be noted that the voltage of the third pulsating waveform meets the test requirements, which may mean that the voltage and current of the third pulsating waveform need to meet the charging voltage and charging current when the battery is charged. That is, the control unit 107 obtains the voltage and / or current output by the charging device according to the sampled voltage value and / or current value of the primary side, and then adjusts a control signal such as PWM according to the voltage and / or current output by the charging device. The duty cycle of the signal adjusts the output of the second rectification unit in real time to achieve closed-loop adjustment control, so that the voltage of the third pulsating waveform can meet the charging requirements of the electronic device, and the battery can be charged safely and reliably.

It can be understood that when adjusting the duty cycle of the PWM signal, an adjustment instruction may be generated according to a voltage sampling value, a current sampling value, or a voltage sampling value and a current sampling value. Translate

Therefore, in the embodiment of the present application, by controlling the switching unit 102, the chopped wave voltage, which is the voltage of the first ripple waveform after full-bridge rectification, is directly subjected to PWM chopping modulation and sent to the high-frequency transformer. The primary is coupled to the secondary, and then reduced to a gimmicky wave voltage / current after synchronous rectification, which is directly sent to the battery to achieve fast charging of the battery. Among them, the voltage amplitude of the hoe wave can be adjusted by the duty cycle of the PWM signal, so that the output of the charging device can meet the charging demand of the battery. It can be known that the charging device in the embodiment of the present application eliminates the primary and secondary electrolytic capacitors and directly charges the battery by using a hoe wave voltage, thereby reducing the size of the charging device, miniaturizing the charging device, and greatly reducing the charging device. cost.

In some embodiments, the first charging port further includes a second communication port, and the second communication port is configured to communicate with the communication module.

The first charging port of the charging device integrates both charging and communication functions.

In some embodiments, the control unit communicates with the communication module through the first charging port to determine a charging mode, wherein the charging mode includes a fast charging mode and a normal charging mode.

In some embodiments, the charging device may use any one of a flyback switching power supply, a forward switching power supply, a push-pull switching power supply, a half-bridge switching power supply, and a full-bridge switching power supply to output a voltage of a pulsating waveform. .

Please refer to FIG. 8, which is a schematic structural diagram of a charging device and an electronic device according to an embodiment of the present application. The electronic device 50 includes a fifth charging interface 501 and a battery 502. The fifth charging interface 501 is connected to the battery 502. When the fifth charging interface 501 is connected to the first charging interface 105, the fifth charging interface 501 changes the third pulse waveform. The voltage is applied to the battery 502 to charge the battery 502.

In some embodiments, the test device includes an electronic load, a communication module, and a control computer. The electronic load is connected to the control computer. The communication module is also connected to the control computer. The control computer can control the electronic load or communicate with the charging device through the communication module. The fast charge process can include five stages:

Phase 1:

After the electronic device (or test device) is connected to the power supply device, the electronic device (or test device) can detect the type of the power supply device through the data pins D + and D-. When it is detected that the power supply device is a charging device, the electronic device The current drawn by the device (or test device) may be greater than a preset current threshold I2 (for example, it may be 1A). When the charging device detects that the output current of the charging device is greater than or equal to I2 within a preset time period (for example, it may be continuous T1 time), the charging device considers that the electronic device (or test device) has completed the type identification of the power supply device, and the charging The device initiates a handshake communication with the electronic device, and the charging device sends an instruction 1 to ask the electronic device (or the test device) whether the fast charging mode (or flash charging) is turned on.

When the charging device receives a response instruction from the electronic device (or testing device) indicating that the electronic device (or testing device) does not agree to enable the fast charging mode, the output current of the charging device is detected again. When the output current of the charging device is at a preset When the continuous time (for example, continuous T1 time) is still greater than or equal to I2, a request is initiated again to ask the electronic device (or test device) whether to enable the fast charging mode, and the above steps of stage 1 are repeated until the electronic device (or test device) ) The answer agrees to start the fast charging mode, or the output current of the charging device no longer meets the condition greater than or equal to I2.

When the electronic device agrees to start the fast charge mode, the fast charge charging process starts, and the fast charge communication process enters the second phase.

Phase 2:

The gimmick voltage output by the charging device may include multiple gears. The charging device sends an instruction to the electronic device (or testing device) 2 to inquire whether the output voltage of the charging device of the electronic device (or testing device) matches the current voltage of the battery (or is it appropriate, That is, whether it is suitable as the charging voltage in the fast charging mode), that is, whether it meets the charging requirements. The test device simulates the condition of the battery at different voltages.

The electronic device (or test device) responds that the output voltage of the charging device is high or low or matches. If the charging device receives feedback from the electronic device (or test device) about the high or low output voltage of the charging device, it controls The unit adjusts the output voltage of the charging device by one division by adjusting the duty cycle of the PWM signal, and sends a command 2 to the electronic device (or test device) again, and asks again whether the output voltage of the charging device of the electronic device (or test device) is match.

Repeat the above step 2 until the electronic device (or test device) responds that the output voltage of the charging device is in a matching range, and then enter the third phase.

Phase 3:

When the charging device receives feedback from the electronic device (or testing device) that the output voltage of the charging device matches, the charging device sends an instruction 3 to the electronic device (or testing device) to inquire about the maximum charging currently supported by the electronic device (or testing device). Current, the electronic device (or test device) responds to the maximum charging current value that the charging device currently supports, and enters the fourth stage.

Phase 4:

After the charging device receives feedback from the electronic device (or testing device) for the currently supported maximum charging current value, the charging device can set its output current reference value, and the control unit adjusts the duty cycle of the PWM signal according to the current reference value to make charging The output current of the device meets the charging current requirements of the electronic equipment (or test device), that is, it enters the constant current phase. The constant current phase here means that the peak value or average value of the output current of the charging device remains basically unchanged (that is, the peak value of the output current or The average value has a small change range, such as a change in the peak value of the output current or 5% of the average value), that is, the current peak value of the third pulse waveform remains constant in each cycle.

Phase 5:

When entering the stage of constant current change, the charging device sends a command 4 at intervals to query the current voltage of the electronic device battery. The electronic device can feedback the current voltage of the electronic device battery to the charging device. The charging device can The current voltage feedback determines whether the USB contact, that is, the contact between the first charging interface and the second charging interface is good, and whether the current charging current value of the electronic device needs to be reduced. When the charging device determines that the USB connection is bad, it sends command 5 and then resets to re-enter stage 1. The test device simulates the situation of the electronic equipment battery in this state.

When entering the stage of constant current change, the charging device sends a command 4 at intervals to query the current voltage of the electronic device battery. The electronic device can feedback the current voltage of the electronic device battery to the charging device. The charging device can The current voltage feedback determines whether the USB contact, that is, the contact between the first charging interface and the second charging interface is good, and whether the current charging current value of the electronic device needs to be reduced. When the charging device judges that the USB connection is bad, it sends command 5 and then resets to re-enter stage 1. The test device simulates the situation of the electronic equipment battery in this state.

During the test, the test device simulates the testing of electronic equipment at various stages. Specifically, the electronic load simulates the voltage, current, and impedance of the battery of the electronic device at different stages. The communication module simulates the information sent by the battery of the electronic device at different stages. The information transmitted and received by the communication module and the voltage detected by the electronic load. , Current and other signals to determine whether each function of the charging device is normal.

Optionally, in some embodiments, in phase 1, when the electronic device (or test device) responds to instruction 1, the data corresponding to the instruction 1 may be accompanied by data (or path impedance data) of the electronic device (or test device). Information), electronic device (or test device) path impedance data can be used to determine whether the USB contact is good at stage 5.

Optionally, in some embodiments, in phase 2, the time from when the electronic device (or test device) agrees to start the fast charging mode to when the charging device adjusts the voltage to a suitable value can be controlled within a certain range, the time Outside the predetermined range, the electronic device (or test device) may determine that the request is abnormal and perform a quick reset.

Optionally, in some embodiments, in phase 2, when the output voltage of the charging device is adjusted to be higher than ΔV (ΔV is about 200-500mV) compared to the current voltage of the battery, the electronic device (or test device) Feedback is given to the charging device as to whether the output voltage of the charging device is appropriate / matched. Among them, when the electronic device (or the testing device) gives feedback to the charging device about the output voltage of the charging device being inappropriate (that is, high or low), the control unit 107 adjusts the duty cycle of the PWM signal according to the voltage sampling value. To adjust the output voltage of the charging device.

Optionally, in some embodiments, in stage 4, the speed of adjusting the size of the output current value of the charging device can be controlled within a certain range, so as to avoid the abnormal interruption of fast charging caused by the adjustment speed being too fast.

Optionally, in some embodiments, in stage 5, the variation range of the magnitude of the output current value of the charging device can be controlled within 5%, that is, it can be regarded as a constant current stage.

Optionally, in some embodiments, in stage 5, the charging device monitors the charging circuit impedance in real time, that is, the entire charging circuit impedance is monitored by measuring the output voltage of the charging device, the current charging current, and the read battery voltage of the electronic device. When the impedance of the charging circuit is measured> the path impedance of the electronic device + the impedance of the fast charge data line, it can be considered that the USB contact is bad, and the fast charge reset is performed.

Optionally, in some embodiments, after the fast charging mode is enabled, the communication time interval between the charging device and the electronic device (or the testing device) may be controlled within a certain range to avoid a fast charging reset.

Optionally, in some embodiments, the stopping of the fast charging mode (or the fast charging process) can be divided into two types: restorable stop and non-recoverable stop:

For example, when the electronic device (or test device) detects that the battery is full or the USB connection is bad, the fast charge stops and resets, and enters phase 1, the electronic device (or test device) does not agree to start the fast charge mode, and the fast charge communication process does not enter Phase 2. The fast charging process stopped at this time may be an irrecoverable stop.

As another example, when there is an abnormal communication between the electronic device (or test device) and the charging device, the fast charge stops and resets to enter phase 1. After meeting the requirements of phase 1, the electronic device (or test device) agrees to start the fast charge mode. To resume the fast charging and charging process, the fast charging process stopped at this time may be a recoverable stop.

For another example, when the electronic device (or the testing device) detects that the battery is abnormal, the fast charging stops and resets to enter the phase 1. After entering the phase 1, the electronic device (or the testing device) does not agree to start the fast charging mode. Until the battery returns to normal and meets the requirements of stage 1, the electronic device (or test device) agrees to start fast charging to resume the fast charging process, and the fast charging process stopped at this time may be a recoverable stop.

It should be noted that the above communication steps or operations are just examples. For example, in phase 1, after the electronic device (or test device) is connected to the charging device, the electronic device (or test device) and the charging device are connected. The handshake communication can also be initiated by the electronic device (or test device), that is, the electronic device (or test device) sends an instruction 1 to ask the charging device whether the fast charging mode (or flash charging) is turned on. When the electronic device (or test device) When the response command from the charging device is received to instruct the charging device to agree to start the fast charging mode, the fast charging process is started.

Please refer to FIG. 9, which is a schematic flowchart of a test method provided by an embodiment of the present application. The test method is based on the test circuit in the above embodiment, and the test method may specifically include:

101. Connect a first input terminal of an electronic load to a first output terminal of a charging device, and a second input terminal of an electronic load to a second output terminal of a charging device.

102. The capacitor module is disposed between the first input terminal and the second input terminal.

103. The electronic device is used to test the pulsation signal output by the charging device. When the voltage of the pulsation signal output by the charging device is lower than the first voltage threshold, the capacitor module supplies power to the charging device.

In some embodiments, the test method may further include: sending control information to the charging device, the control information is used to control the charging device to change the output electrical signal; using an electronic load to obtain the changed output electrical signal of the charging device; detecting the change according to the control information Whether the subsequent output electrical signal is qualified.

Specifically, the electronic load is connected to a control computer, which controls parameters such as the impedance of the electronic load, and simultaneously acquires information such as voltage, current, and frequency output by the electronic load detection and charging device. The control computer is also connected to a communication module. The control computer can simulate electronic equipment and send different control information to the charging device through the communication module. The control information can be information such as the battery value, temperature, and voltage of the analog electronic device, and is used to detect the reaction of the charging device to the low, medium, high, and full battery conditions, such as low battery Charging for small current, fast charging for medium power, constant current charging for high power, no charging at full power, etc. Among them, the low power can be less than 10% of the total power, the middle power is 10% -70% of the total power, the high power is 70% -98% of the total power, and the full power is 98% -100% of the total power. It can also be used to detect the response of the charging device to the low and high temperature of the battery, such as fast charging at low and high temperatures, intermittent charging at high temperatures, and so on. Among them, the low temperature and the high temperature differ depending on the type of the battery.

In the above embodiment, the charging device may be one of a power adapter, a power bank, and a charging base. The electronic device may be a smart phone, a tablet computer, a notebook computer, a VR device, and the like.

In the above embodiments, the description of each embodiment has its own emphasis. For a part that is not described in detail in one embodiment, reference may be made to related descriptions in other embodiments.

The test circuit and test system provided in the embodiments of the present application have been described in detail above. Specific examples are used herein to explain the principle and implementation of the present application. The descriptions of the above embodiments are only used to help understand the application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation and the scope of application. In summary, the content of this description should not be understood as a limitation on the present application.

Claims

A test circuit including:

The electronic load includes a first input terminal and a second input terminal. The first input terminal is used to connect a first output terminal of the charging device, and the second input terminal is used to connect a first input terminal of the charging device. Two output terminals, the electronic load is used to test the pulsation signal output by the charging device;

A capacitor module disposed between the first input terminal and the second input terminal, when the voltage of the pulse signal output by the charging device is lower than a first voltage threshold, the capacitor module For powering the charging device.
The test circuit according to claim 1, wherein the capacitor module includes at least two capacitors connected in parallel.
The test circuit according to claim 1, wherein the capacitance module includes a variable capacitor.
The test circuit according to claim 1, wherein a capacitance value of the capacitor module is greater than 100 uF.
The test circuit according to claim 1, wherein the test circuit further comprises a communication module, the communication module including a first communication port, the first communication port for connecting with a second communication port of the charging device The communication module is configured to perform bidirectional communication with the charging device, and the communication module detects a communication function of the charging device.
The test circuit according to claim 1, wherein the test circuit further comprises a communication module, the communication module including a first communication port, the first communication port for connecting with a second communication port of the charging device ;

The communication module is configured to send control information, and the control information is used to control the charging device to change an output electric signal;

The electronic load includes a detection module, and the detection module is configured to detect whether the changed output electric signal of the charging device is qualified according to control information.
The test circuit according to claim 1, wherein:

The test circuit further includes a switch tube, and a first resistor and a second resistor connected in series. The first resistor and the second resistor connected in series are disposed between the first input terminal and the second input terminal. The control terminal of the switch tube is connected between the first resistor and the second resistor, the input terminal of the switch tube is used to connect the second output terminal of the charging device, and the output terminal of the switch tube is connected to the The second input terminal of the electronic load, the switch tube is used for connecting the input terminal of the switch tube with the output terminal of the switch tube when the output voltage of the charging device is greater than a second voltage threshold.
A test system including:

Electronic load, the electronic load includes a first input terminal and a second input terminal, the first input terminal is used for connecting the first output terminal of the charging device, and the second input terminal is used for connecting the second output of the charging device Terminal, the electronic load is used to test the pulsation signal output by the charging device;

A capacitor module disposed between the first input terminal and the second input terminal, when the voltage of the pulse signal output by the charging device is lower than a first voltage threshold, the capacitor module For powering the charging device.
The test system according to claim 8, wherein:

The capacitor module includes a capacitor, a first terminal of the capacitor is directly connected to the first input terminal, and a second terminal of the capacitor is directly connected to the second output terminal.
The test system according to claim 8, wherein:

The capacitor module includes at least two capacitors connected in parallel, a first terminal of the two parallel capacitors is directly connected to the first input terminal, and a second terminal of the two parallel capacitors is directly connected to the second capacitor. Output.
The test system according to claim 8, wherein:

The detection device further includes a substrate, the capacitor module is disposed on the substrate, the substrate is provided with a first connection port and a second connection port, and the capacitor module is disposed on the first connection port and Between the second connection ports, the first connection port is used to connect a charging device, and the second connection port is connected to an electronic load.
The test system according to claim 11, wherein:

The substrate is further provided with a switch tube, and a first resistor and a second resistor connected in series. The first resistor and the second resistor connected in series are disposed between the first input terminal and the second input terminal. The control terminal of the switch tube is connected between the first resistor and the second resistor. The input terminal of the switch tube is used to connect the second output terminal of the charging device. The output terminal of the switch tube is connected to the The second input terminal of the electronic load, and the switch tube is configured to connect the input terminal of the switch tube with the output terminal of the switch tube when the output voltage of the charging device is greater than a second voltage threshold.
A test system including:

A charging device including a first output terminal and a second output terminal, and the charging device outputs a pulsation signal;

A testing device comprising an electronic load and a capacitor module;

The electronic load includes a first input terminal and a second input terminal, the first input terminal is connected to a first output terminal of the charging device, the second input terminal is connected to a second output terminal of the charging device, and the electronic load test A pulsation signal output by the charging device;

The capacitor module is disposed between the first input terminal and the second input terminal. When the voltage of the pulse signal output by the charging device is lower than a first voltage threshold, the capacitor module charges the battery. Device powered.
The test system according to claim 13, wherein the charging device further comprises:

A first rectifying unit configured to rectify an input alternating current to output a voltage of a first pulsating waveform;

A switching unit configured to modulate the voltage of the first pulsating waveform according to a control signal;

A transformer including a primary winding and a secondary winding, and the transformer is configured to output a voltage of a second pulsating waveform according to the modulated voltage of the first pulsating waveform;

A second rectifying unit, the second rectifying unit is connected to the secondary winding, and the second rectifying unit is configured to rectify the voltage of the second pulse waveform to output a voltage of the third pulse waveform;

A first charging port, the first charging port including the first output terminal and the second output terminal, and loading the voltage of the third pulse waveform to the electronic load through the first charging port;

A sampling unit, configured to sample an electrical signal on the primary winding;

A control unit that is respectively connected to the sampling unit and the switching unit, the control unit outputs the control signal to the switching unit, and calculates An electrical signal sampling value corresponding to the output of the second rectifying unit, and adjusting a duty cycle of the control signal according to the electrical signal sampling value, so that the voltage of the third pulsating waveform meets the electronic load's Testing requirements.
The test system according to claim 14, wherein the test device further comprises a communication module;

The control unit is connected to the first charging port, and the control unit is further configured to communicate with the communication module through the first charging port to obtain sending information of the communication module.
The test system according to claim 15, wherein the control unit is further configured to adjust a duty ratio of the control signal according to the transmission information of the communication module and the electrical signal sampling value.
The test system according to claim 14, wherein the first charging port further comprises a second communication port, and the second communication port is used to communicate with the communication module.
The test system according to claim 14, wherein the control unit communicates with the communication module through the first charging port to determine a charging mode, wherein the charging mode includes a fast charging mode and a normal charging mode.
A testing method, comprising: connecting a first input terminal of an electronic load to a first output terminal of a charging device, and connecting a second input terminal of the electronic load to a second output terminal of the charging device;

Placing a capacitor module between the first input terminal and the second input terminal;

The electronic load is used to test the pulsation signal output by the charging device. When the voltage of the pulsation signal output by the charging device is lower than a first voltage threshold, the capacitor module supplies power to the charging device.
The test method according to claim 19, further comprising:

Sending control information to the charging device, where the control information is used to control the charging device to change an output electric signal;

Using the electronic load to obtain the changed output electrical signal of the charging device;

Detecting whether the changed output electric signal is qualified according to the control information.