CN112147484A - Test system based on charging chip and charging test system - Google Patents

Test system based on charging chip and charging test system Download PDF

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Publication number
CN112147484A
CN112147484A CN202010884262.4A CN202010884262A CN112147484A CN 112147484 A CN112147484 A CN 112147484A CN 202010884262 A CN202010884262 A CN 202010884262A CN 112147484 A CN112147484 A CN 112147484A
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China
Prior art keywords
battery
circuit
charging
voltage
analog
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CN202010884262.4A
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Chinese (zh)
Inventor
黄贤超
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Zhuhai Amicro Semiconductor Co Ltd
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Zhuhai Amicro Semiconductor Co Ltd
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Priority to CN202010884262.4A priority Critical patent/CN112147484A/en
Publication of CN112147484A publication Critical patent/CN112147484A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2832Specific tests of electronic circuits not provided for elsewhere
    • G01R31/2834Automated test systems [ATE]; using microprocessors or computers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2851Testing of integrated circuits [IC]
    • G01R31/2894Aspects of quality control [QC]
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2851Testing of integrated circuits [IC]
    • G01R31/2896Testing of IC packages; Test features related to IC packages

Abstract

The invention discloses a test system based on a charging chip and a charging test system, wherein the test system based on the charging chip at least comprises an analog battery circuit and a battery charging current measuring circuit, but does not comprise a main controller and a charging management chip; the other test system based on the charging chip comprises a simulation battery circuit, an adjustable battery voltage circuit, a battery charging current measuring circuit and a main controller, but does not comprise a charging management chip; the charging test system based on the charging chip comprises an analog battery circuit, an adjustable battery voltage circuit, a battery charging current measuring circuit and a main controller. The invention does not need to consider the influence of the service life of the solid battery, ensures the test correctness and the test reliability of the charging management chip accessed by the test system, and has the advantages of simple test system, low test accessory cost and wide application range.

Description

Test system based on charging chip and charging test system
Technical Field
The invention belongs to the technical field of chip testing, and particularly relates to a testing system based on a charging chip and a charging testing system.
Background
After the lithium battery charging management chip performs final test (tests are performed on the packaged chip), a QC (quality control) test is generally required to be performed before the lithium battery charging management chip is delivered to a customer for use, so as to ensure that each charging index of the lithium battery charging management chip meets the application requirement. The current test schemes generally adopt a real lithium battery for detection, and have a defect that: after the lithium battery is charged for a plurality of times and is detected, voltage and electric quantity are changed, when the lithium battery is charged to a certain degree, charging detection can not be carried out, the battery needs to be replaced and checked, bad factors of a lead are increased, and testing correctness and reliability of the lithium charging management chip are affected.
Disclosure of Invention
The invention effectively solves the defects and realizes the automatic detection of the charging management chip by designing the charging circuit system of the simulation battery to replace a real lithium battery and combining the charging management chip with a test system for carrying out the simulation regulation test of constant current and constant voltage.
A charging chip based test system, the test system comprising: the device comprises an analog battery circuit and a battery charging current measuring circuit; the analog battery circuit at least comprises a power supply, a power supply port, a floating grounding end, a signal output end and a signal input end, wherein the signal input end of the analog battery circuit is used for receiving a battery voltage signal to be processed, and the power supply port of the analog battery circuit is connected to the power supply; the battery charging current measuring circuit at least comprises a positive battery input end, a negative battery input end, a first grounding end and a first communication interface, wherein the positive battery input end of the battery charging current measuring circuit is connected with the floating grounding end of the simulation battery circuit, the first grounding end of the battery charging current measuring circuit is grounded, the negative battery input end of the battery charging current measuring circuit is grounded, and the first communication interface of the battery charging current measuring circuit is used for transmitting a measuring signal of charging current to a controller outside the test system; the signal output end of the analog battery circuit and the positive battery input end of the battery charging current measuring circuit are used for being connected to a charging management chip outside the test system.
Compared with the prior art, the technical scheme has the advantages that the simulation battery circuit is used for replacing the battery, the real-time stable monitoring of the battery charging state can be carried out by combining the battery charging current measuring circuit, meanwhile, the test system consisting of the simulation battery circuit and the battery charging current measuring circuit can be applied to charging chip detection or other electrical tests on electronic products, the influence of the service life of the solid battery is not required to be considered, the test accuracy and the test reliability of a charging management chip connected to the test system are ensured, meanwhile, the test system is simple, the test accessory cost is low, and the application range is wide.
Furthermore, the test system also comprises an adjustable battery voltage circuit, wherein the adjustable battery voltage circuit at least comprises a second communication interface and a conversion output end; the second communication interface of the battery voltage adjustable circuit is used for receiving a voltage adjusting signal written by a controller outside the external test system; and the signal input end of the analog battery circuit is connected with the conversion output end of the adjustable battery voltage circuit. The technical scheme adjusts and controls the battery voltage input into the analog battery circuit in real time, realizes demonstration of analog battery charging processes (a constant-current charging process and a constant-voltage charging process), does not need to replace batteries, and reduces artificial failure factors of operators.
Furthermore, the analog battery circuit also comprises an amplifier, a first feedback resistor and a second feedback resistor, wherein the amplifier comprises a positive power supply end, a negative power supply end, a positive phase input end, an inverted phase input end and a voltage output end; the positive power end of the amplifier is connected with the power supply port of the analog battery circuit, the negative power end of the amplifier is connected with the floating grounding end of the analog battery circuit, the voltage output end of the amplifier is connected with the signal output end of the analog battery circuit, and the positive phase input end of the amplifier is connected with the signal input end of the analog battery circuit; one end of the first feedback resistor is connected with the voltage output end of the amplifier, the other end of the first feedback resistor is connected with the inverting input end of the amplifier, the inverting input end of the amplifier is connected with one end of the second feedback resistor, and the other end of the second feedback resistor is grounded. Therefore, the amplification processing of the voltage signal input into the analog battery circuit is controlled, so that the battery voltage range output by the analog battery circuit covers the voltage provided by the preset number of batteries.
Furthermore, the battery charging current measuring circuit also comprises a sampling resistor and an electric quantity monitoring chip, wherein the electric quantity monitoring chip comprises a positive analog input end, a negative analog input end, a second grounding end, a first serial data end and a first serial clock end; the positive analog input end of the electric quantity monitoring chip is connected with the positive battery input end of the battery charging current measuring circuit, the negative analog input end of the electric quantity monitoring chip is connected with the negative battery input end of the battery charging current measuring circuit, the first serial data end and the first serial clock end of the electric quantity monitoring chip are respectively connected with the matched first communication interface of the battery charging current measuring circuit, and the second grounding end of the electric quantity monitoring chip is grounded; the sampling resistor is connected between the positive battery input end of the battery charging current measuring circuit and the negative battery input end of the battery charging current measuring circuit and is used for sampling and detecting the charging current output by the charging management chip in a constant current charging mode and/or the charging voltage output by the charging management chip in a constant voltage charging mode. Whether the charging management chip is in a normal working state or not can be monitored by detecting the current flowing through the sampling resistor of the battery charging current measuring circuit, and the charging management chip with problems can be found in time.
Further, the adjustable battery voltage circuit includes a DAC converter including a reference power input terminal, a reference voltage output terminal, an analog voltage conversion output terminal, a third ground terminal, a second serial data terminal, and a second serial clock terminal; the analog voltage conversion output end of the DAC converter is connected with the conversion output end of the adjustable battery voltage circuit, the reference power supply input end of the DAC converter is connected with the reference voltage output end of the DAC converter, the second serial data end and the second serial clock end of the DAC converter are respectively connected with the second communication interface matched with the adjustable battery voltage circuit, and the third grounding end of the DAC converter is grounded. The technical scheme can convert the data commands transmitted by the serial data end and the serial clock end into decimal voltage signals, realize the configuration of the battery voltage which can be simulated by the simulated battery circuit, and facilitate the designer to configure the voltage value by adopting an automatic means.
Further, the DAC121C085 chip is adopted as the DAC converter, and the INA219 chip is adopted as the electric quantity monitoring chip. The hardware realization of the test system based on the charging chip is facilitated.
A charging chip based test system, the test system comprising: the device comprises an analog battery circuit, an adjustable battery voltage circuit, a battery charging current measuring circuit and a main controller; the adjustable battery voltage circuit at least comprises a second communication interface and a conversion output end, and the second communication interface of the adjustable battery voltage circuit is connected with a corresponding third communication interface arranged on the main controller; the analog battery circuit at least comprises a power supply source, a power supply port, a floating grounding end, a signal output end and a signal input end, wherein the signal input end of the analog battery circuit is connected with the conversion output end of the adjustable battery voltage circuit, and the power supply port of the analog battery circuit is connected with the power supply source; the battery charging current measuring circuit at least comprises a positive battery input end, a negative battery input end, a first grounding end and a first communication interface, wherein the positive battery input end of the battery charging current measuring circuit is connected with the floating grounding end of the analog battery circuit, the first grounding end of the battery charging current measuring circuit is grounded, the negative battery input end of the battery charging current measuring circuit is grounded, and the first communication interface of the battery charging current measuring circuit is connected with a corresponding third communication interface arranged on the main controller; the signal output end of the analog battery circuit and the positive battery input end of the battery charging current measuring circuit are used for being connected with a charging management chip outside the testing system so as to realize that the main controller regulates and monitors constant-current charging and/or the main controller regulates and monitors constant-voltage charging.
Compared with the prior art, the technical scheme combines the actual charging requirements of the charging management chip which needs to be accessed from the outside, uses the simulation substitution of batteries with different voltage specifications, uses the simulation battery circuit to substitute the batteries, combines the battery charging current measuring circuit and the adjustable battery voltage circuit to carry out real-time stable monitoring and feedback adjustment on the charging state of the batteries, adjusts a constant-voltage constant-current charging control mode compatible with the simulation battery circuit and simulates a constant-voltage constant-current charging stage of the batteries, does not need to consider the influence of the service life of the solid batteries, and ensures the testing correctness and the testing reliability of the charging management chip accessed by the testing system.
Furthermore, the analog battery circuit also comprises an amplifier, a first feedback resistor and a second feedback resistor, wherein the amplifier comprises a positive power supply end, a negative power supply end, a positive phase input end, an inverted phase input end and a voltage output end; the positive power end of the amplifier is connected with the power supply port of the analog battery circuit, the negative power end of the amplifier is connected with the floating grounding end of the analog battery circuit, the voltage output end of the amplifier is connected with the signal output end of the analog battery circuit, and the positive phase input end of the amplifier is connected with the signal input end of the analog battery circuit; one end of the first feedback resistor is connected with the voltage output end of the amplifier, the other end of the first feedback resistor is connected with the inverting input end of the amplifier, the inverting input end of the amplifier is connected with one end of the second feedback resistor, and the other end of the second feedback resistor is grounded. The technical scheme is that the combination of conventional materials such as an amplifier and a resistor is adopted to simulate the battery, the simulation is easy to realize, the voltage output by the amplifier can be used for simulating the working states (including constant-current charging and constant-voltage charging) under different charging voltages, and the simulation battery circuit can be designed according to the actual required voltage of the battery subsequently, so that the battery voltage output by the simulation battery circuit can cover the voltage provided by the batteries with the preset number.
Furthermore, the battery charging current measuring circuit also comprises a sampling resistor and an electric quantity monitoring chip, wherein the electric quantity monitoring chip comprises a positive analog input end, a negative analog input end, a second grounding end, a first serial data end and a first serial clock end; the positive analog input end of the electric quantity monitoring chip is connected with the positive battery input end of the battery charging current measuring circuit, the negative analog input end of the electric quantity monitoring chip is connected with the negative battery input end of the battery charging current measuring circuit, and the second grounding end of the electric quantity monitoring chip is grounded; the sampling resistor is connected between the positive battery input end of the battery charging current measuring circuit and the negative battery input end of the battery charging current measuring circuit and is used for sampling and detecting the charging current output by the charging management chip in a constant current charging mode and/or the charging voltage output by the charging management chip in a constant voltage charging mode; a first serial data end and a first serial clock end of the electric quantity monitoring chip are respectively connected with a matched first communication interface of the battery charging current measuring circuit and are used for supporting the main controller to read a test result obtained by detection of the battery charging current measuring circuit, and the test result comprises charging current of the charging management chip in a constant current charging mode and/or charging voltage of the charging management chip in a constant voltage charging mode; one end of the sampling resistor is connected with the negative power supply end of the amplifier, and the other end of the sampling resistor is grounded.
The technical scheme is suitable for monitoring the working state of the matched charging current under different voltage signals converted and output by the adjustable battery voltage circuit, so that the circuit is integrated to perform simulation demonstration of a constant current charging mode and/or a constant voltage charging mode, the main controller is enabled to monitor whether the charging management chip is in a normal working state or not, and the charging management chip with problems is discovered in time.
Further, the adjustable battery voltage circuit includes a DAC converter including a reference power input terminal, a reference voltage output terminal, an analog voltage conversion output terminal, a third ground terminal, a second serial data terminal, and a second serial clock terminal; the analog voltage conversion output end of the DAC converter is connected with the conversion output end of the adjustable battery voltage circuit, the reference power supply input end of the DAC converter is connected with the reference voltage output end of the DAC converter, the third grounding end of the adjustable battery voltage circuit is grounded, and the second serial data end and the second serial clock end of the DAC converter are respectively connected with the second communication interface matched with the adjustable battery voltage circuit and used for supporting the main controller to transmit an instruction signal corresponding to the voltage to be adjusted to the adjustable battery voltage circuit. According to the technical scheme, voltage regulation can be performed on the constant-current constant-voltage charging performance of the charging management chip to be tested, and intelligent control of the main controller is achieved.
Furthermore, the main controller is connected with a computer through a USB interface and used for displaying the test result of the battery charging current measuring circuit by running upper computer software of the computer and simulating and demonstrating the step state change of the simulated battery circuit in constant current charging and constant voltage charging according to the test result of the battery charging current measuring circuit.
A charging test system based on a charging chip comprises a charging management chip and the test system based on the charging chip, or comprises the charging management chip and the test system based on the charging chip; the charging management chip at least comprises a battery positive terminal, a battery negative terminal and a fourth grounding terminal, wherein the battery positive terminal of the charging management chip is connected with the signal output terminal of the analog battery circuit of the test system according to any one of claims 1 to 12, the floating grounding terminal of the analog battery circuit is connected with the battery negative terminal of the charging management chip, and the fourth grounding terminal of the charging management chip is grounded. According to the technical scheme, the influence of the service life of the solid battery does not need to be considered, and the test correctness and the test reliability of the charging management chip accessed by the test system are ensured.
Furthermore, the charging management chip internally comprises a constant current circuit and a constant voltage circuit; the constant current circuit is used for limiting the current flowing through the sampling resistor of the battery charging current measuring circuit to be kept at a constant current value so as to enter a constant current charging state; the constant voltage circuit is used for changing the current flowing through the sampling resistor according to the step-by-step increase adjustment of the analog battery voltage output by the analog battery circuit by the main controller of the test system, so that when the current flowing through the sampling resistor is a preset cut-off current, the voltage of the battery positive terminal of the charging management chip is kept at a constant voltage value to enter a constant voltage charging state; the preset cut-off current is a current supporting the full charge of the analog battery circuit and is also a current value at a boundary point of a constant-voltage charging state and a constant-current charging state; when the main controller of the test system reads and judges that the constant current value is in the current standard range and reads and judges that the constant voltage value is in the voltage standard range, the charging management chip is identified as a qualified charging chip. According to the technical scheme, after the charging management chip is connected into the test system, the constant-current charging function can be realized, and the constant-voltage full-charge function can be quickly detected.
Further, the charge management chip is a charge management chip suitable for a lithium battery, and the analog battery circuit is used for analog output of voltages of 1 to 4 lithium batteries. The charging detection is realized repeatedly without replacing the battery.
Drawings
Fig. 1 is a schematic circuit diagram of a charging chip-based test system according to an embodiment of the present invention (excluding a main controller and a charging management chip).
Fig. 2 is a circuit schematic diagram of a charging chip-based test system according to a second embodiment of the present invention (including a main controller but not including a charging management chip).
Fig. 3 is a schematic circuit diagram (including a main controller and a charging management chip) of a charging test system based on a charging chip according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1, a first embodiment of the present invention discloses a test system based on a charging chip, including: the device comprises an analog battery circuit and a battery charging current measuring circuit; the analog battery circuit at least includes a power supply, a power supply port, a floating ground, a signal output end and a signal input end, and it can be understood that the power supply port, the floating ground, the signal output end and the signal input end of the analog battery circuit, which are not shown in fig. 1, may be a wire or a solder joint in an actual test circuit, and are not necessarily a real hardware input/output interface; the signal input end of the analog battery circuit is used for receiving a battery voltage signal to be processed, and the power supply port of the analog battery circuit is connected to a power supply VCC. The battery charging current measuring circuit at least comprises a positive battery input end, a negative battery input end, a first ground end and a first communication interface, and it can be understood that a power supply port, a floating ground end, a signal output end and a signal input end of the battery charging current measuring circuit, which are not shown in fig. 1, may be a wire or a welding point in an actual test circuit, and are not necessarily a real hardware input/output interface; the positive battery input end of the battery charging current measuring circuit is connected with the floating ground end of the analog battery circuit, the first ground end of the battery charging current measuring circuit is grounded, the negative battery input end of the battery charging current measuring circuit is grounded, and the first communication interface of the battery charging current measuring circuit is used for transmitting a measuring signal of charging current to a controller outside the test system; wherein, the signal output end of the analog battery circuit and the positive battery input end of the battery charging current measuring circuit are used for accessing a charging management chip (not shown in fig. 1) outside the test system. Compared with the prior art, the embodiment uses the simulation battery circuit to replace the battery, can combine the battery charging current measuring circuit to carry out real-time stable monitoring on the battery charging state, can apply the test system formed by the simulation battery circuit and the battery charging current measuring circuit to charging chip detection or other electrical tests on electronic products, does not need to consider the influence of the service life of the solid battery, ensures the test accuracy and the test reliability of the charging management chip accessed by the test system, and has the advantages of simple test system, low test accessory cost and wide application range.
Preferably, as shown in fig. 1, the test system further includes an adjustable battery voltage circuit, where the adjustable battery voltage circuit includes at least a second communication interface and a conversion output terminal, and it is understood that the second communication interface and the conversion output terminal of the adjustable battery voltage circuit, which are not shown in fig. 1, may be a wire or a pad in the actual test circuit, and are not necessarily an actual hardware input/output interface; the second communication interface of the adjustable battery voltage circuit is used for receiving a voltage adjusting signal written by a controller outside the external test system, and the second communication interface can be an I2C communication interface and is used for receiving data and clock command signals; and the signal input end of the analog battery circuit is connected with the conversion output end of the adjustable battery voltage circuit and is used for receiving the voltage converted by the adjustable battery voltage circuit, and the voltage comes from the data command signal received by the communication interface. The battery voltage input into the analog battery circuit is regulated and controlled in real time, the demonstration of the analog battery charging process (constant-current charging process and constant-voltage charging process) is realized, the battery does not need to be replaced, and the artificial failure factor of an operator is reduced.
On the basis of the first embodiment, as shown IN fig. 1, the analog battery circuit further includes an amplifier, a first feedback resistor R1 and a second feedback resistor R2, wherein the amplifier includes a positive power supply terminal V +, a negative power supply terminal V-, a positive input terminal IN +, an inverting input terminal IN-, and a voltage output terminal VO; the positive power source end V + of the amplifier is connected with the power supply port of the analog battery circuit, and can be regarded as the positive power source end V + of the amplifier is connected into a power supply VCC; the negative power supply end V-of the amplifier is connected with the floating grounding end of the analog battery circuit, and can be regarded as that the negative power supply end V-of the amplifier is connected with the positive battery input end of the battery charging current measuring circuit; the voltage output end VO of the amplifier is connected with the signal output end of the analog battery circuit; the signal input end of the analog battery circuit is connected with the conversion output end of the adjustable battery voltage circuit, the positive phase input end IN + of the amplifier is connected with the signal input end of the analog battery circuit, and the positive phase input end IN + of the amplifier can be regarded as being connected with the conversion output end of the adjustable battery voltage circuit and used for receiving the voltage VDACout output by the conversion output end of the adjustable battery voltage circuit; one end of the first feedback resistor R1 is connected with the voltage output end VO of the amplifier, the other end of the first feedback resistor R1 is connected with the inverting input end IN-of the amplifier, the inverting input end IN-of the amplifier is connected with one end of the second feedback resistor R2, and the other end of the second feedback resistor R2 is grounded. Therefore, the voltage at the voltage output terminal VO of the amplifier is (1 + R1/R2) × VDACout, and the amplification function of the analog battery circuit is realized, wherein R1/R2 is the amplification factor, and the present embodiment sets R1/R2 to 4. Therefore, the amplification processing of the voltage signal input into the analog battery circuit is controlled, so that the battery voltage range output by the analog battery circuit covers the voltage provided by the preset number of batteries.
On the basis of the first embodiment, as shown in fig. 1, the battery charging current measuring circuit further includes a sampling resistor R3 and a power monitoring chip, where the power monitoring chip includes a positive analog input terminal VIN +, a negative analog input terminal VIN-, a second ground terminal GND2, a first serial data terminal SDA1, and a first serial clock terminal SCL 1; the positive analog input end VIN + of the electric quantity monitoring chip is connected with the positive battery input end of the battery charging current measuring circuit, and can be regarded as the positive analog input end VIN + of the electric quantity monitoring chip is connected with the negative power supply end V-of the amplifier; the negative analog input end VIN-of the electric quantity monitoring chip is connected with the negative battery input end of the battery charging current measuring circuit and can be regarded as the negative analog input end VIN-of the electric quantity monitoring chip is grounded; a first serial data end SDA1 and a first serial clock end SCL1 of the electric quantity monitoring chip are respectively connected with a matched first communication interface of the battery charging current measuring circuit and are used for transmitting current and voltage information sampled by the sampling resistor R3 to a controller outside the testing system; the second ground terminal GND2 of the power monitoring chip is grounded; the sampling resistor R3 is connected between a positive battery input end VIN + of the battery charging current measuring circuit and a negative battery input end VIN-of the battery charging current measuring circuit, and is used for sampling and detecting the charging current output by the charging management chip in a constant current charging mode and/or the charging voltage output by the charging management chip in a constant voltage charging mode, which are accessed by the test system, and by detecting the current flowing through the sampling resistor of the battery charging current measuring circuit, whether the charging management chip is in a normal working state or not can be monitored, and the charging management chip with problems can be found in time.
On the basis of the first embodiment, the adjustable battery voltage circuit comprises a DAC converter, the DAC converter comprises a reference power supply input terminal VREF, a reference voltage output terminal VA, an analog voltage conversion output terminal VOUT, a third ground terminal GND3, a second serial data terminal SDA2 and a second serial clock terminal SCL 2; an analog voltage conversion output terminal VOUT of the DAC converter is connected to a conversion output terminal of the adjustable battery voltage circuit, which may be regarded as the analog voltage conversion output terminal VOUT of the DAC converter being connected to a positive input terminal IN + of the amplifier; the reference power supply input end VREF of the DAC converter is connected with the reference voltage output end VA of the DAC converter, and is used for taking the internal reference voltage of the DAC converter as the introduced reference power supply voltage, and the ideal reference voltage source is not influenced by power supply and temperature, so the connection relation can provide stable voltage for the DAC converter in the adjustable battery voltage circuit, and the precision and the stability are higher than those of a common power supply. The second serial data end SDA2 and the second serial clock end SCL2 of the DAC converter are respectively connected with a second communication interface matched with the adjustable battery voltage circuit, the second communication interface of the adjustable battery voltage circuit is used for receiving a voltage adjusting signal written by an external controller outside the test system, and a data command transmitted by the second serial data end SDA2 can be converted into a decimal voltage signal, so that the battery voltage which can be simulated by the simulated battery circuit can be configured, and a designer can conveniently configure the voltage value by adopting an automatic means. The third ground GND3 of the DAC converter is grounded.
Preferably, the DAC converter adopts a DAC121C085 chip with an I2C interface, and the electric quantity monitoring chip adopts an INA219 chip. The hardware realization of the test system based on the charging chip is facilitated. The controller MCU outside the test system writes data into the DAC converter of the adjustable battery voltage circuit through an I2C communication interface, the voltage output by the analog voltage conversion output end VOUT of the DAC converter is VDACout =4.096 xD/4096V, wherein D is decimal data written by the MCU, and the value range of D is 0-4095, so that the value range of VDACout voltage is 0-4.096V. IN order to meet the voltage requirement of the lithium batteries of 0 to 16.8V, the analog battery circuit needs to implement a certain amplification function, that is, the analog battery circuit amplifies the VDACout input by the non-inverting input terminal IN + of the amplifier according to a certain amplification factor, and since the present embodiment sets R1/R2 IN the analog battery circuit to 4, the analog battery circuit sets the voltage output terminal VO = 5 × VDACout of the amplifier, so that the voltage output by the signal output terminal of the analog battery circuit is between 0 and 20.48V, and the voltage requirement of 0 to 16.8V provided by 1 to 4 lithium batteries is met, thereby implementing the function of battery voltage regulation.
As shown in fig. 2, a second embodiment of the present invention discloses another testing system based on a charging chip, which includes: the device comprises an analog battery circuit, an adjustable battery voltage circuit, a battery charging current measuring circuit and a main controller; the adjustable battery voltage circuit at least includes a communication interface and a conversion output terminal, and it can be understood that the second communication interface and the conversion output terminal of the adjustable battery voltage circuit not shown in fig. 2 may be a wire or a solder joint in an actual test circuit, and are not necessarily a real hardware input/output interface; the second communication interface of the circuit capable of adjusting the battery voltage is connected with a corresponding third communication interface arranged on the main controller; the second communication interface of the adjustable battery voltage circuit is used for receiving voltage adjustment signals written by a controller outside the test system, and the second communication interface can be an I2C communication interface and is used for receiving data and clock command signals. The analog battery circuit at least includes a power supply, a power supply port, a floating ground, a signal output end and a signal input end, and it can be understood that the power supply port, the floating ground, the signal output end and the signal input end of the analog battery circuit, which are not shown in fig. 2, may be a wire or a welding point in an actual test circuit, and are not necessarily a real hardware input/output interface; the signal input end of the analog battery circuit is connected with the conversion output end of the adjustable battery voltage circuit, and the power supply port of the analog battery circuit is connected with a power supply VCC. The battery charging current measuring circuit at least comprises a positive battery input end, a negative battery input end, a first ground end and a first communication interface, and it can be understood that a power supply port, a floating ground end, a signal output end and a signal input end of the battery charging current measuring circuit, which are not shown in fig. 2, may be a wire or a welding point in an actual test circuit, and are not necessarily a real hardware input/output interface; the positive battery input end of the battery charging current measuring circuit is connected with the floating grounding end of the analog battery circuit, the first grounding end of the battery charging current measuring circuit is grounded, the negative battery input end of the battery charging current measuring circuit is grounded, the first communication interface of the battery charging current measuring circuit is connected with the corresponding third communication interface arranged on the main controller, the first communication interface of the battery charging current measuring circuit is used for transmitting a charging current measuring signal to the main controller, the signal output end of the analog battery circuit and the positive battery input end of the battery charging current measuring circuit are used for being connected with a charging management chip outside the test system so as to realize that the main controller regulates and monitors constant-current charging and/or the main controller regulates and monitors constant-voltage charging (not shown in fig. 2). Compared with the prior art, the present embodiment uses simulation substitution of batteries with different voltage specifications in combination with actual charging requirements of a charging management chip to be accessed externally, uses a simulation battery circuit to substitute the battery, and performs real-time stable monitoring and feedback adjustment of the battery charging state in combination with the battery charging current measuring circuit and the adjustable battery voltage circuit, so as to adjust a constant-voltage constant-current charging control mode compatible with the simulation battery circuit and simulate a battery constant-voltage constant-current charging stage, without considering the influence of the service life of an entity battery, and ensure the testing accuracy and the testing reliability of the charging management chip accessed by the testing system.
IN the second embodiment, as shown IN fig. 2, the analog battery circuit further includes an amplifier, a first feedback resistor R1 and a second feedback resistor R2, wherein the amplifier includes a positive power supply terminal V +, a negative power supply terminal V-, a positive input terminal IN +, an inverting input terminal IN-, and a voltage output terminal VO; the positive power source end V + of the amplifier is connected with the power supply port of the analog battery circuit, and can be regarded as the positive power source end V + of the amplifier is connected into a power supply VCC; the negative power supply end V-of the amplifier is connected with the floating grounding end of the analog battery circuit, and can be regarded as that the negative power supply end V-of the amplifier is connected with the positive battery input end of the battery charging current measuring circuit; the voltage output end VO of the amplifier is connected with the signal output end of the analog battery circuit; the signal input end of the analog battery circuit is connected with the conversion output end of the adjustable battery voltage circuit, the positive phase input end IN + of the amplifier is connected with the signal input end of the analog battery circuit, and the positive phase input end IN + of the amplifier can be regarded as being connected with the conversion output end of the adjustable battery voltage circuit and used for receiving the voltage VDACout output by the conversion output end of the adjustable battery voltage circuit; one end of the first feedback resistor R1 is connected with the voltage output end VO of the amplifier, the other end of the first feedback resistor R1 is connected with the inverting input end IN-of the amplifier, the inverting input end IN-of the amplifier is connected with one end of the second feedback resistor R2, and the other end of the second feedback resistor R2 is grounded. Therefore, the voltage at the voltage output terminal VO of the amplifier is (1 + R1/R2) × VDACout, and the amplification function of the analog battery circuit is realized, wherein R1/R2 is the amplification factor, and the present embodiment sets R1/R2 to 4. Therefore, the amplification processing of the voltage signal input into the analog battery circuit is controlled, so that the battery voltage range output by the analog battery circuit covers the voltage provided by the preset number of batteries.
In a second embodiment, as shown in fig. 2, the battery charging current measuring circuit further includes a sampling resistor R3 and a power monitoring chip, where the power monitoring chip includes a positive analog input terminal VIN +, a negative analog input terminal VIN-, a second ground terminal GND2, a first serial data terminal SDA1, and a first serial clock terminal SCL 1; the positive analog input end VIN + of the electric quantity monitoring chip is connected with the positive battery input end of the battery charging current measuring circuit, and can be regarded as the positive analog input end VIN + of the electric quantity monitoring chip is connected with the negative power supply end V-of the amplifier; the negative analog input end VIN-of the electric quantity monitoring chip is connected with the negative battery input end of the battery charging current measuring circuit and can be regarded as the negative analog input end VIN-of the electric quantity monitoring chip is grounded; the first serial data end SDA1 and the first serial clock end SCL1 of the electric quantity monitoring chip are respectively connected with a matched first communication interface of the battery charging current measuring circuit, the first serial data end SDA1 of the electric quantity monitoring chip is connected with the third serial data end SDA3 of the main controller, the first serial clock end SCL1 of the electric quantity monitoring chip is connected with the third serial clock end SCL3 of the main controller, the electric quantity monitoring chip is used for transmitting current voltage information sampled by the sampling resistor R3 to the main controller, and the main controller is supported to read a test result obtained by the battery charging current measuring circuit, and the test result comprises the charging current of a charging management chip outside the test system in a constant current charging mode and/or the charging voltage of the charging management chip in a constant voltage charging mode; the second ground terminal GND2 of the power monitoring chip is grounded; the sampling resistor R3 is connected between a positive battery input end VIN + of the battery charging current measuring circuit and a negative battery input end VIN-of the battery charging current measuring circuit, and is used for sampling and detecting the charging current output by the charging management chip in a constant current charging mode and/or the charging voltage output by the charging management chip in a constant voltage charging mode, which are accessed by the test system, and by detecting the current flowing through the sampling resistor of the battery charging current measuring circuit, whether the charging management chip is in a normal working state or not can be monitored, and the charging management chip with problems can be found in time. One end of the sampling resistor R3 is connected with the negative power supply end V-of the amplifier, and the other end of the sampling resistor R3 is grounded. The embodiment is suitable for monitoring the working state of the matched charging current under different voltage signals converted and output by the adjustable battery voltage circuit, so that the circuit is integrated to perform simulation demonstration of a constant current charging mode and/or a constant voltage charging mode, the main controller is enabled to monitor whether the charging management chip is in a normal working state or not, and the charging management chip with problems is discovered in time.
In the second embodiment, as shown in fig. 2, the adjustable battery voltage circuit includes a DAC converter, the DAC converter includes a reference power input terminal VREF, a reference voltage output terminal VA, an analog voltage conversion output terminal VOUT, a third ground terminal GND3, a second serial data terminal SDA2, and a second serial clock terminal SCL 2; an analog voltage conversion output terminal VOUT of the DAC converter is connected to a conversion output terminal of the adjustable battery voltage circuit, which may be regarded as the analog voltage conversion output terminal VOUT of the DAC converter being connected to a positive input terminal IN + of the amplifier; the reference power supply input end VREF of the DAC converter is connected with the reference voltage output end VA of the DAC converter, and is used for taking the internal reference voltage of the DAC converter as the introduced reference power supply voltage, and the ideal reference voltage source is not influenced by power supply and temperature, so the connection relation can provide stable voltage for the DAC converter in the adjustable battery voltage circuit, and the precision and the stability are higher than those of a common power supply. The second serial data end SDA2 and the second serial clock end SCL2 of the DAC converter are respectively connected with the matched second communication interface of the adjustable battery voltage circuit, the second serial data end SDA2 of the DAC converter is connected with the third serial data end SDA3 of the master controller, the second serial clock end SCL2 of the DAC converter is connected with the third serial clock end SCL3 of the master controller, used for supporting the main controller to transmit an instruction signal corresponding to the voltage to be regulated to the adjustable battery voltage circuit, the voltage regulating circuit is used for receiving a voltage regulating signal written by a controller outside the test system, and can convert data commands transmitted by the second serial data end SDA2 and the second serial clock end SCL2 into decimal voltage signals, so that the battery voltage which can be simulated by the simulated battery circuit can be configured, and a designer can conveniently configure the voltage value by adopting an automatic means. The third ground GND3 of the DAC converter is grounded. The embodiment can adjust the voltage aiming at the constant-current and constant-voltage charging performance of the charging management chip to be tested, so as to realize the intelligent control of the main controller.
On the basis of the second embodiment, the main controller is further connected with a computer through a USB interface, and is configured to display a test result of the battery charging current measuring circuit by running upper computer software of the computer, and simulate and demonstrate a step state change of the simulated battery circuit in constant current charging and constant voltage charging according to the test result of the battery charging current measuring circuit, where the test result of the battery charging current measuring circuit is obtained by reading a serial data end SDA of the main controller and is displayed on a UI interface of the upper computer.
Preferably, the DAC converter adopts a DAC121C085 chip, and the electric quantity monitoring chip adopts an INA219 chip. The hardware realization of the test system based on the charging chip is facilitated. The controller (MCU) outside the test system writes data into a DAC converter of the adjustable battery voltage circuit through an I2C communication interface, the voltage output by the analog voltage conversion output end VOUT of the DAC converter is VDACout =4.096 x D/4096V, D is decimal data written by the MCU, and the value range of D is 0-4095, so that the value range of VDACout voltage is 0-4.096V. IN order to meet the voltage requirement of the lithium battery of 0-16.8V, the analog battery circuit needs to implement a certain amplification function, that is, the analog battery circuit amplifies the VDACout input by the non-inverting input terminal IN + of the amplifier according to a certain amplification factor, and since the present embodiment sets R1/R2 IN the analog battery circuit to 4, the analog battery circuit sets the voltage output terminal VO = 5 × VDACout of the amplifier, so that the voltage output by the signal output terminal of the analog battery circuit is between 0 and 20.48V, and the voltage requirement of 0 to 16.8V provided by 1 to 4 lithium batteries is met, thereby implementing the function of battery voltage regulation.
As shown in fig. 3, a third embodiment of the present invention discloses a charging test system based on a charging chip, where the charging test system includes a charging management chip and the testing system based on the charging chip described in the first embodiment, or the charging test system includes the charging management chip and the testing system based on the charging chip described in the second embodiment; as shown in fig. 3, the charge management chip at least includes a battery positive terminal BAT +, a battery negative terminal BAT —, and a fourth ground terminal GND 4; the battery positive terminal BAT + of the charge management chip is connected with the signal output terminal of the analog battery circuit in the foregoing embodiment, that is, the battery positive terminal BAT + of the charge management chip is connected with the voltage output terminal VO of the amplifier, and is configured to receive the analog battery voltage VBat output by the analog battery circuit; the floating ground terminal of the analog battery circuit is connected with the battery negative terminal BAT-of the charging management chip, the fourth ground terminal GND4 of the charging management chip is grounded, the battery negative terminal BAT-of the charging management chip is grounded through the sampling resistor R3 to form a current loop, so that the function of constant current charging is realized, specifically, the charging current flows from the charging management chip to the analog battery circuit and then flows back to the battery negative terminal BAT-of the charging management chip from the floating ground terminal of the analog battery circuit, and the sampling resistor R3 is also connected between the battery negative terminal BAT-of the charging management chip and the fourth ground terminal GND4 of the charging management chip to form a current loop, so that the function of constant current charging is realized. The charging management chip controls the analog battery circuit to enter a constant-voltage charging mode by adjusting the analog battery voltage output by the analog battery circuit in a stepped manner according to the adjustable battery voltage circuit; according to the technical scheme, the influence of the service life of the solid battery does not need to be considered, and the test correctness and the test reliability of the charging management chip accessed by the test system are ensured.
In the third embodiment, the charging management chip internally includes a constant current circuit and a constant voltage circuit; the constant current circuit is used for limiting the current flowing through the sampling resistor of the battery charging current measuring circuit to be kept at a constant current value so as to enter a constant current charging state; after the electric quantity monitoring chip detects the voltage at two ends of the sampling resistor R3, the voltage is converted and stored in a register through an internal ADC (analog to digital converter) converter, the main controller reads the register through an I2C interface (a third serial data end SDA 3), then the current flowing through the sampling resistor R3 is calculated through shift conversion (the high four-digit binary number and the low eight-digit binary number read by the I2C interface are converted), namely the charging current of the battery is identified, and then whether the charging management chip is a qualified chip is defined by judging whether the charging current of the battery is in a current standard range. The constant voltage circuit is used for changing the current flowing through the sampling resistor according to the step-by-step increase adjustment of the analog battery voltage output by the analog battery circuit by the main controller of the test system, so that when the current flowing through the sampling resistor is a preset cut-off current, the voltage of the battery positive terminal of the charging management chip is kept at a constant voltage value to enter a constant voltage charging state; specifically, the main controller changes the value written into the DAC converter of the adjustable battery voltage circuit step by step, namely, the voltage signal input into the second serial data end SDA2 of the DAC converter is increased by one step at a time, after the step voltage is increased by one time, the current Isample flowing through two ends of the sampling resistor R3 is measured by the battery charging current measuring circuit, when the Isample is equal to the preset cut-off current Ioff, the Constant voltage charging is indicated to be fully charged, and the Constant voltage value VBat _ Constant is recorded, and the main controller determines whether the charging management chip is a qualified chip or not by judging whether the VBat _ Constant is in a standard voltage range or not. This preset cutoff current is the current that supports full charge of the analog battery circuit, and is also the current value at the demarcation point between the constant voltage state of charge and the constant current state of charge. Therefore, in the third embodiment, when the main controller of the test system reads and judges that the constant current value is in the current standard range and reads and judges that the constant voltage value is in the voltage standard range, the charging management chip is identified as a qualified charging chip. In this embodiment, after the charging management chip is connected to the test system, a constant-current charging function can be realized, and a constant-voltage full-charge function can be quickly detected.
Preferably, the charge management chip is a charge management chip suitable for lithium batteries, and the analog battery circuit is used for analog output of voltages of 1 to 4 lithium batteries. The charging detection is realized repeatedly without replacing the battery.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (15)

1. A charging chip based test system, comprising: the device comprises an analog battery circuit and a battery charging current measuring circuit;
the analog battery circuit at least comprises a power supply, a power supply port, a floating grounding end, a signal output end and a signal input end, wherein the signal input end of the analog battery circuit is used for receiving a battery voltage signal to be processed, and the power supply port of the analog battery circuit is connected to the power supply;
the battery charging current measuring circuit at least comprises a positive battery input end, a negative battery input end, a first grounding end and a first communication interface, wherein the positive battery input end of the battery charging current measuring circuit is connected with the floating grounding end of the simulation battery circuit, the first grounding end of the battery charging current measuring circuit is grounded, the negative battery input end of the battery charging current measuring circuit is grounded, and the first communication interface of the battery charging current measuring circuit is used for transmitting a measuring signal of charging current to a controller outside the test system;
the signal output end of the analog battery circuit and the positive battery input end of the battery charging current measuring circuit are used for being connected to a charging management chip outside the test system.
2. The test system of claim 1, further comprising an adjustable battery voltage circuit, the adjustable battery voltage circuit comprising at least a second communication interface and a switching output;
the second communication interface of the battery voltage adjustable circuit is used for receiving a voltage adjusting signal written by a controller outside the external test system;
and the signal input end of the analog battery circuit is connected with the conversion output end of the adjustable battery voltage circuit.
3. The test system of claim 1 or 2, wherein the analog battery circuit further comprises an amplifier, a first feedback resistor and a second feedback resistor, the amplifier comprising a positive power supply terminal, a negative power supply terminal, a positive phase input terminal, an inverting input terminal and a voltage output terminal;
the positive power end of the amplifier is connected with the power supply port of the analog battery circuit, the negative power end of the amplifier is connected with the floating grounding end of the analog battery circuit, the voltage output end of the amplifier is connected with the signal output end of the analog battery circuit, and the positive phase input end of the amplifier is connected with the signal input end of the analog battery circuit;
one end of the first feedback resistor is connected with the voltage output end of the amplifier, the other end of the first feedback resistor is connected with the inverting input end of the amplifier, the inverting input end of the amplifier is connected with one end of the second feedback resistor, and the other end of the second feedback resistor is grounded.
4. The test system of claim 3, wherein the battery charging current measuring circuit further comprises a sampling resistor and a power monitoring chip, the power monitoring chip comprising a positive analog input terminal, a negative analog input terminal, a second ground terminal, a first serial data terminal (SDA 1) and a first serial clock terminal (SCL 1);
the positive analog input end of the electric quantity monitoring chip is connected with the positive battery input end of the battery charging current measuring circuit, the negative analog input end of the electric quantity monitoring chip is connected with the negative battery input end of the battery charging current measuring circuit, the first serial data end (SDA 1) and the first serial clock end (SCL 1) of the electric quantity monitoring chip are respectively connected with the matched first communication interface of the battery charging current measuring circuit, and the second grounding end of the electric quantity monitoring chip is grounded;
the sampling resistor is connected between the positive battery input end of the battery charging current measuring circuit and the negative battery input end of the battery charging current measuring circuit and is used for sampling and detecting the charging current output by the charging management chip in a constant current charging mode and/or the charging voltage output by the charging management chip in a constant voltage charging mode.
5. The test system of claim 4, wherein the adjustable battery voltage circuit comprises a DAC converter having a reference power input, a reference voltage output, an analog voltage conversion output, a third ground, a second serial data terminal (SDA 2), and a second serial clock terminal (SCL 2);
the analog voltage conversion output end of the DAC converter is connected with the conversion output end of the adjustable battery voltage circuit, the reference power supply input end of the DAC converter is connected with the reference voltage output end of the DAC converter, the second serial data end (SDA 2) and the second serial clock end (SCL 2) of the DAC converter are respectively connected with the matched second communication interface of the adjustable battery voltage circuit, and the third grounding end of the DAC converter is grounded.
6. The test system of claim 5, wherein the DAC converter employs a DAC121C085 chip, and the power monitoring chip employs an INA219 chip.
7. A charging chip based test system, comprising: the device comprises an analog battery circuit, an adjustable battery voltage circuit, a battery charging current measuring circuit and a main controller;
the adjustable battery voltage circuit at least comprises a second communication interface and a conversion output end, and the second communication interface of the adjustable battery voltage circuit is connected with a corresponding third communication interface arranged on the main controller;
the analog battery circuit at least comprises a power supply source, a power supply port, a floating grounding end, a signal output end and a signal input end, wherein the signal input end of the analog battery circuit is connected with the conversion output end of the adjustable battery voltage circuit, and the power supply port of the analog battery circuit is connected with the power supply source;
the battery charging current measuring circuit at least comprises a positive battery input end, a negative battery input end, a first grounding end and a first communication interface, wherein the positive battery input end of the battery charging current measuring circuit is connected with the floating grounding end of the analog battery circuit, the first grounding end of the battery charging current measuring circuit is grounded, the negative battery input end of the battery charging current measuring circuit is grounded, and the first communication interface of the battery charging current measuring circuit is connected with a corresponding third communication interface arranged on the main controller;
the signal output end of the analog battery circuit and the positive battery input end of the battery charging current measuring circuit are used for being connected with a charging management chip outside the testing system so as to realize that the main controller regulates and monitors constant-current charging and/or the main controller regulates and monitors constant-voltage charging.
8. The test system of claim 7, wherein the analog battery circuit further comprises an amplifier, a first feedback resistor, and a second feedback resistor, the amplifier comprising a positive power supply terminal, a negative power supply terminal, a positive phase input terminal, an inverted phase input terminal, and a voltage output terminal;
the positive power end of the amplifier is connected with the power supply port of the analog battery circuit, the negative power end of the amplifier is connected with the floating grounding end of the analog battery circuit, the voltage output end of the amplifier is connected with the signal output end of the analog battery circuit, and the positive phase input end of the amplifier is connected with the signal input end of the analog battery circuit;
one end of the first feedback resistor is connected with the voltage output end of the amplifier, the other end of the first feedback resistor is connected with the inverting input end of the amplifier, the inverting input end of the amplifier is connected with one end of the second feedback resistor, and the other end of the second feedback resistor is grounded.
9. The test system of claim 8, wherein the battery charging current measuring circuit further comprises a sampling resistor and a power monitoring chip, the power monitoring chip comprising a positive analog input terminal, a negative analog input terminal, a second ground terminal, a first serial data terminal (SDA 1), and a first serial clock terminal (SCL 1);
the positive analog input end of the electric quantity monitoring chip is connected with the positive battery input end of the battery charging current measuring circuit, the negative analog input end of the electric quantity monitoring chip is connected with the negative battery input end of the battery charging current measuring circuit, and the second grounding end of the electric quantity monitoring chip is grounded;
the sampling resistor is connected between the positive battery input end of the battery charging current measuring circuit and the negative battery input end of the battery charging current measuring circuit and is used for sampling and detecting the charging current output by the charging management chip in a constant current charging mode and/or the charging voltage output by the charging management chip in a constant voltage charging mode;
a first serial data end (SDA 1) and a first serial clock end (SCL 1) of the electric quantity monitoring chip are respectively connected with a first communication interface matched with the battery charging current measuring circuit, and are used for supporting the main controller to read a test result obtained by the battery charging current measuring circuit, wherein the test result comprises the charging current of the charging management chip in a constant current charging mode and/or the charging voltage of the charging management chip in a constant voltage charging mode;
one end of the sampling resistor is connected with the negative power supply end of the amplifier, and the other end of the sampling resistor is grounded.
10. The test system of claim 8 or 9, wherein the adjustable battery voltage circuit comprises a DAC converter including a reference power input, a reference voltage output, an analog voltage conversion output, a third ground, a second serial data terminal (SDA 2), and a second serial clock terminal (SCL 2);
the analog voltage conversion output end of the DAC converter is connected with the conversion output end of the adjustable battery voltage circuit, the reference power supply input end of the DAC converter is connected with the reference voltage output end of the DAC converter, the third grounding end of the adjustable battery voltage circuit is grounded, and the second serial data end (SDA 2) and the second serial clock end (SCL 2) of the DAC converter are respectively connected with the matched second communication interface of the adjustable battery voltage circuit and used for supporting the main controller to transmit an instruction signal corresponding to the voltage to be adjusted to the adjustable battery voltage circuit.
11. The test system of claim 10, wherein the DAC converter is implemented by a DAC121C085 chip, and the power monitoring chip is implemented by an INA219 chip.
12. The test system of claim 10, wherein the main controller is connected to a computer through a USB interface, and is configured to display a test result of the battery charging current measurement circuit by running a host computer software of the computer, and simulate and demonstrate a step state change of the simulated battery circuit in constant current charging and constant voltage charging according to the test result of the battery charging current measurement circuit.
13. A charging chip based charging test system, characterized in that the charging test system comprises a charging management chip and the charging chip based test system of any one of claims 1 to 6, or the charging test system comprises a charging management chip and the charging chip based test system of any one of claims 7 to 12;
the charging management chip at least comprises a battery positive terminal, a battery negative terminal and a fourth grounding terminal, wherein the battery positive terminal of the charging management chip is connected with the signal output terminal of the analog battery circuit of the test system according to any one of claims 1 to 12, the floating grounding terminal of the analog battery circuit is connected with the battery negative terminal of the charging management chip, and the fourth grounding terminal of the charging management chip is grounded.
14. The charging test system according to claim 13, wherein the charging management chip internally includes a constant current circuit and a constant voltage circuit;
the constant current circuit is used for limiting the current flowing through the sampling resistor of the battery charging current measuring circuit to be kept at a constant current value so as to enter a constant current charging state;
the constant voltage circuit is used for changing the current flowing through the sampling resistor according to the step-by-step increase adjustment of the analog battery voltage output by the analog battery circuit by the main controller of the test system, so that when the current flowing through the sampling resistor is a preset cut-off current, the voltage of the battery positive terminal of the charging management chip is kept at a constant voltage value to enter a constant voltage charging state; the preset cut-off current is a current supporting the full charge of the analog battery circuit and is also a current value at a boundary point of a constant-voltage charging state and a constant-current charging state;
when the main controller of the test system reads and judges that the constant current value is in the current standard range and reads and judges that the constant voltage value is in the voltage standard range, the charging management chip is identified as a qualified charging chip.
15. The charging test system of claim 13, wherein the charging management chip is a charging management chip for a lithium battery, and the analog battery circuit is configured to output a voltage of 1 to 4 lithium batteries in an analog manner.
CN202010884262.4A 2020-08-28 2020-08-28 Test system based on charging chip and charging test system Pending CN112147484A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113740716A (en) * 2021-11-08 2021-12-03 深圳英集芯科技股份有限公司 Charging chip test system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113740716A (en) * 2021-11-08 2021-12-03 深圳英集芯科技股份有限公司 Charging chip test system and method

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