Rechargeable simulation battery and test circuit

Abstract

The utility model aims to provide the rechargeable simulation battery and the test circuit which are low in cost, ensure the precision and have the charging detection function at the same time, thereby solving the problem that the charging and discharging test cost of the simulation battery in a small-sized test system is too high. The rechargeable simulation battery comprises a synchronous BUCK unit, an output inductor, an output capacitor, a current-limiting resistor, a first feedback resistor and a second feedback resistor, one end of the current-limiting resistor is connected to an SW port of the synchronous BUCK unit through the output inductor, the synchronous BUCK unit comprises a synchronous field effect transistor connected with the SW port, constant output voltage is connected between the current-limiting resistor and the output inductor, and the output capacitor is connected with the synchronous field effect transistor. The output capacitor is connected with the output inductor, and an FB feedback port of the synchronous BUCK unit is connected with the first feedback resistor and the second feedback resistor; the test circuit is used for testing the rechargeable simulation battery module. The simulation battery is applied to the technical field of simulation batteries.

Description

Technical Field

[0001] The utility model is applied to the technical field of simulated batteries, and particularly relates to a rechargeable simulated battery and a test circuit. Background Art

[0002] A simulated battery can simulate the behavior of a battery and generate an output voltage and current similar to that of a battery. Different from a real battery, a simulated battery is usually composed of electronic components and circuits. By controlling and adjusting the parameters of these components and circuits, flexible control of the output voltage and current can be achieved to meet the power supply requirements in different scenarios. The output parameters of the simulated battery can be adjusted by adjusting the parameters of the circuit and components to achieve precise control of the output voltage and current. This adjustability makes the simulated battery very useful in some special applications. Compared with a real battery, a simulated battery can replace the electrochemical reaction by using electronic components and circuits, reducing the cost and being reusable.

[0003] However, it is difficult for existing simulated batteries to simulate all the characteristics of actual batteries. Usually, by adjusting the input voltage and controlling the output current with an electronic load, the current-voltage curve during battery discharge can be well simulated. But when it comes to battery charging, the simulated battery needs to be able to absorb the current injected from an external source, and relative to the discharging state, the measured current value is also in the opposite direction at this time. To achieve the charging function, additional circuits need to be added for assistance.

[0004] At the same time, after the charging function is realized, it also needs to be tested to ensure the accuracy of the charging function. The existing detection schemes for the functions of battery charging and discharging are usually based on an integrated BMS functional instrument. With this existing instrument, the charging and discharging processes of the simulated battery can also be realized, but its integration degree is too high, and it is a large instrument that cannot be applied to small test systems; moreover, its cost is relatively too high, and it is difficult to be widely used in low-cost miniaturized systems.

[0005] If a rechargeable simulated battery with a charging function and low cost can be provided, as well as a test circuit that can cooperate with this simulated battery to conduct charging function tests, then the difficulties in the charging and discharging tests of the simulated battery in small test systems can be well solved, and the test cost of small systems can be reduced. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a rechargeable simulated battery and a test circuit that are low in cost, ensure accuracy and have charging detection, so as to solve the problem of too high charging and discharging test costs of the simulated battery in small test systems.

[0007] The technical solution adopted by the present utility model is as follows: The rechargeable analog battery includes a synchronous BUCK unit, an output inductor L, an output capacitor Co, a current-limiting resistor Rs, a first feedback resistor R1, and a second feedback resistor R2. One end of the current-limiting resistor Rs is connected to the SW port of the synchronous BUCK unit through the output inductor L, and the other end of the current-limiting resistor Rs cooperates with an external constant-voltage charging power supply. The synchronous BUCK unit includes a synchronous field-effect transistor connected to the SW port. A constant output voltage Vo is connected between the current-limiting resistor Rs and the output inductor L. The output capacitor Co is connected to one end of the output inductor L close to the constant output voltage Vo. One end of the first feedback resistor R1 is connected between the constant output voltage Vo and the output capacitor Co, and the other end of the first feedback resistor R1 is connected to the FB feedback port of the synchronous BUCK unit and one end of the second feedback resistor R2, and the other end of the second feedback resistor R2 is grounded.

[0008] As can be seen from the above solution, when the analog battery discharges, it is output by the constant output voltage Vo in cooperation with the output capacitor Co and the current-limiting resistor Rs. When charging, the external constant-voltage power supply is connected to the output end of the output capacitor Co through the current-limiting resistor Rs. When the voltage of the external constant-voltage power supply is higher than the constant output voltage Vo, an inrush current is formed, and the inrush current flows into the SW end of the synchronous BUCK unit. At this time, the synchronous field-effect transistor, the output inductor L, and the output capacitor Co inside the synchronous BUCK unit cooperate to form a boost boost circuit, thereby forming a stable controllable voltage and current analog charging circuit. Furthermore, an analog battery module with charge and discharge function simulation is provided in a small test system.

[0009] A preferred solution is that the synchronous BUCK includes two connected synchronous field-effect transistors, the SW port is connected between the synchronous field-effect transistors, one synchronous field-effect transistor is connected to the working voltage VIN, and the other synchronous field-effect transistor is grounded.

[0010] The test circuit is used to test the rechargeable analog battery. The test circuit includes a constant-voltage power supply PS and an electronic load E-Load. The positive pole of the constant-voltage power supply PS is connected to the end of the current-limiting resistor Rs far from the output inductor L, the negative pole of the constant-voltage power supply PS is grounded, and the positive pole of the electronic load E-Load is connected to the working voltage VIN input end of the synchronous BUCK unit.

[0011] As can be seen from the above solution, in order to ensure that the rechargeable analog battery can effectively simulate the charging state, it is necessary to verify this module. Through the cooperation of the constant voltage power supply PS and the electronic load E-Load, the charging action simulation of the rechargeable analog battery can be realized at low cost and quickly. During this process, the simulation effect of the rechargeable analog battery during charging is obtained by detecting the current and voltage data at various points in the module. Description of the Drawings

[0012] Figure 1 is the circuit schematic diagram of the rechargeable analog battery;

[0013] Figure 2 is the circuit schematic diagram when the test circuit cooperates with the rechargeable analog battery. Detailed Implementation Manner

[0014] As Figure 1 shown, in this embodiment, the rechargeable analog battery includes a synchronous BUCK unit, an output inductor L, an output capacitor Co, a current limiting resistor Rs, a first feedback resistor R1, and a second feedback resistor R2. One end of the current limiting resistor Rs is connected to the SW port of the synchronous BUCK unit through the output inductor L, and the other end of the current limiting resistor Rs cooperates with an external constant voltage charging power supply. The synchronous BUCK unit includes a synchronous field effect transistor connected to the SW port. A constant output voltage Vo is connected between the current limiting resistor Rs and the output inductor L. The output capacitor Co is connected to one end of the output inductor L close to the constant output voltage Vo. One end of the first feedback resistor R1 is connected between the constant output voltage Vo and the output capacitor Co, and the other end of the first feedback resistor R1 is connected to the FB feedback port of the synchronous BUCK unit and one end of the second feedback resistor R2, and the other end of the second feedback resistor R2 is grounded. The synchronous BUCK unit is connected to the output inductor L and the output capacitor Co, and a voltage feedback loop is formed after voltage division by the first feedback resistor R1 and the second feedback resistor R2 and introduced into the feedback terminal FB of the synchronous BUCK unit.

[0015] The synchronous BUCK unit is a switching regulator with the model number TPS543B20.

[0016] The synchronous BUCK unit includes two connected synchronous field effect transistors. The SW port is connected between the synchronous field effect transistors. One synchronous field effect transistor is connected to the working voltage VIN, and the other synchronous field effect transistor is grounded.

[0017] The charging principle of the rechargeable analog battery:

[0018] The external constant voltage power supply CV is connected to the output end of the output capacitor Co through the current limiting resistor Rs, and the voltage of the external constant voltage power supply must be higher than the constant output voltage Vo to generate the sink current. The sink current Ii flows into the SW end of the synchronous BUCK unit, and its current size is determined by the value of the current limiting resistor Rs and the voltage difference between the external constant voltage power supply CV and the constant output voltage Vo.

[0019] At this time, the synchronous field effect tube inside the synchronous BUCK unit, the output inductor L and the output capacitor Co form a boost circuit, and the current flows from the SW end of the synchronous BUCK unit to its input end. Therefore, relative to the external constant voltage power supply CV, the current injected by it is absorbed by the rechargeable simulation battery. The size of the input current Ii can also be controlled by a constant current source circuit, thereby forming a stable controllable voltage and current simulation charging circuit.

[0020] like Figure 2 As shown, the test circuit is used to test the rechargeable simulated battery, and the test circuit includes a constant voltage power supply PS and an electronic load E-Load, the positive electrode of the constant voltage power supply PS is connected to the end of the current limiting resistor Rs away from the output inductor L, the negative electrode of the constant voltage power supply PS is grounded, and the positive electrode of the electronic load E-Load is connected to the working voltage VIN input end of the synchronous BUCK unit. The constant voltage power supply PS has a constant current characteristic.

[0021] The test principle of the test circuit is:

[0022] By connecting the constant voltage power supply PS to the output end of the rechargeable simulated battery, that is, one end of the current limiting resistor Rs and the constant voltage power supply PS, and connecting an electronic load E-Load to the input end of the rechargeable simulated battery, the energy injected into the output end is absorbed.

[0023] The constant output voltage Vo of the rechargeable simulated battery is lower than the voltage set by the constant voltage power supply PS, and the rechargeable simulated battery is in a charging state. The input current Iload set by the electronic load E-Load is greater than the sum of the current Ii injected by the constant voltage power supply PS and the circuit static input current Ia, that is, Iload ≥ Ii+Ia.

[0024] Before the test begins, the input current of the electronic load E-Load is set, the rechargeable simulated battery is started, and finally the constant voltage power supply PS is turned on to inject current, thereby ensuring stable operation of the system.

[0025] When the current of the electronic load E-Load is not set or the set current is less than the sum of the input current Ii and the static current Ia, the rechargeable analog battery circuit will be damaged. Before starting the constant voltage power supply PS, it is necessary to ensure that the rechargeable analog battery is in a stable output state. The input current in an unstable state will also cause damage to the rechargeable analog battery. During operation, the constant current value of the constant voltage power supply PS is adjusted to determine the magnitude of the input current. The adjustment of the constant current value shall not be greater than the difference between the set value of the electronic load E-Load and the static current, otherwise it is likely to cause the failure protection of the rechargeable analog battery.

[0026] Although the embodiments of the present invention are described with actual solutions, they do not constitute a limitation to the meaning of the present invention. For those skilled in the art, the modifications to its implementation solutions according to this specification and the combinations with other solutions are obvious.

Claims

1. A rechargeable analog battery, characterized in that: It includes a synchronous BUCK unit, an output inductor L, an output capacitor Co, a current-limiting resistor Rs, a first feedback resistor R1, and a second feedback resistor R2. One end of the current-limiting resistor Rs is connected to the SW port of the synchronous BUCK unit through the output inductor L, and the other end of the current-limiting resistor Rs cooperates with an external constant-voltage charging power supply. The synchronous BUCK unit includes a synchronous field-effect transistor connected to the SW port. A constant output voltage Vo is connected between the current-limiting resistor Rs and the output inductor L. The output capacitor Co is connected to the end of the output inductor L close to the constant output voltage Vo. One end of the first feedback resistor R1 is connected between the constant output voltage Vo and the output capacitor Co, the other end of the first feedback resistor R1 is connected to the FB feedback port of the synchronous BUCK unit and one end of the second feedback resistor R2, and the other end of the second feedback resistor R2 is grounded.

2. The rechargeable analog battery according to claim 1, characterized in that: The synchronous BUCK unit includes two connected synchronous field-effect transistors. The SW port is connected between the synchronous field-effect transistors. One of the synchronous field-effect transistors is connected to the working voltage VIN, and the other synchronous field-effect transistor is grounded.

3. A test circuit, which is used to test a rechargeable analog battery as described in claim 1, is characterized in that: The test circuit includes a constant-voltage power supply PS and an electronic load E-Load. The positive pole of the constant-voltage power supply PS is connected to the end of the current-limiting resistor Rs far from the output inductor L, the negative pole of the constant-voltage power supply PS is grounded, and the positive pole of the electronic load E-Load is connected to the working voltage VIN input terminal of the synchronous BUCK unit.

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