TWI437492B - Battery simulator - Google Patents

Description

Battery simulator

The present invention relates to a battery simulation device, and more particularly to a battery simulation device having a simple structure.

Many large wattage power supplies (such as uninterruptible power systems and built-in backup battery power supplies) that use rechargeable batteries as the main or backup power supply must be used with the battery for long-term test before shipment. Whether the supplier can smoothly charge and discharge the rechargeable battery.

As shown in FIGS. 4A and 4B, the battery charge and discharge characteristic test is generally seen. When the battery is discharged, the battery voltage gradually decreases until the cutoff voltage is reached, and the discharge is stopped; when the battery is charged, the battery voltage gradually rises until the battery is charged. The float voltage is reached and the potential is maintained at this potential until the battery is fully charged; therefore, the charge and discharge time of the battery depends on the float voltage and the cutoff voltage. Excessive float voltage tends to cause overheating and overcharging of the battery. Battery life; on the contrary, too low cut-off voltage will cause a large increase in the next charging time, even when the cut-off voltage is lower than 0V, and the battery life is reduced due to the reverse charging phenomenon; Avoid high floating charge voltage and low cutoff voltage to avoid damage to the battery during testing.

The above test of charging and discharging characteristics using a solid battery has the following disadvantages:

1. The charge and discharge time is too long.

2. Overcharge or overdischarge is vulnerable to the battery.

3. The battery is bulky and difficult to replace if it is damaged due to test.

Based on the above problems, a battery charging and discharging simulator 50 has been developed. Referring to FIG. 5, it includes a DC power supply unit 51, an electronic analog load 52, and a main control unit 53. The DC power supply is provided. The unit 51 further includes a small-capacity battery 511 for providing the operating power of the DC power unit 51, and the electronic analog load 52 is connected to the output of the DC power unit 51 to the power input of the power supply 30, and the main control The device 53 is electrically connected to the DC power supply unit 51 and the electronic analog load 52 respectively, and the DC power supply unit 51 and the electronic analog load 52 are set according to the current connected power supply with the required specific rechargeable battery state, and the power supply 30 is simulated. The discharged and charged state of the rechargeable battery 511 is required.

Although the above battery charging and discharging simulator can simulate the charging and discharging characteristics of the rechargeable battery for the power supply, instead of the physical rechargeable battery for the test, the user must perform special software through the main control device to complete the setting and simulation, for the general user. In terms of its use, it is expensive to use and expensive to build, and it cannot be widely used. It is necessary to further improve it.

In view of the above disadvantages, the main object of the present invention is to provide a battery simulation device which does not require a built-in battery and has a simple structure.

The main technical means used to achieve the above purpose is that the battery simulation device comprises: an AC/DC conversion unit connected to an AC power source to convert AC power to DC power; and an adjustable DC conversion unit connected to the intersection a DC conversion unit includes a DC converter, an output capacitor, and a controller; wherein the DC converter is connected to an output end of the AC/DC conversion unit, and the AC/DC conversion unit output is changed by control of the controller The DC voltage is stored in the output capacitor; a programmable load is connected to the output power capacitor of the adjustable DC conversion unit to the DC power bus, and the DC power bus is connected to the DC power terminal of the external power supply. a control and communication unit electrically connected to the pulse width modulation input end of the controller of the adjustable DC conversion unit, and connected to the programmable load through a switch, and then connected to the DC bus to obtain the current Voltage value and current value; in addition, the control and communication unit includes a power supply connection Interface, and a computer communication interface for external computer connection; the above invention is mainly connected to an external computer by the control and communication unit, so the user can directly charge the battery according to the power supply of the machine to be tested. Select the corresponding battery charge and discharge simulation, select and transfer the charge and discharge simulation command to the control and communication unit through the external computer, and the control and communication unit controls the adjustable DC conversion unit and the programmable charge mode battery charge and discharge state. The external power supply is tested by the external power supply; in addition, since the power supply of the DC conversion unit of the present invention is provided by the AC/DC conversion unit, it is not necessary to provide a battery for power supply, and the overall architecture can be effectively reduced; It is not necessary to purchase expensive software for different power supplies. As long as the external computer is connected to the present invention, the appropriate battery charging and discharging simulation program can be selected to automatically complete the test program.

The second object of the present invention is to provide a battery simulation device that achieves energy-saving performance by energy feedback, and the program load is mainly a DC-to-AC converter, and is further connected to an input end of the AC/DC conversion unit; When the programmable load is started during the charging simulation, the current of the direct current drawn from the DC power bus can be converted into the current of the alternating current, and then fed back to the input end of the alternating current conversion unit as an alternating current, which is effective. Achieve energy efficiency.

Referring to FIG. 1 , a preferred embodiment of the battery simulator of the present invention includes: an AC/DC conversion unit 11 connected to an AC power source to convert AC power to DC power; and an adjustable DC conversion. The unit 12 is connected to the AC/DC converting unit 11 and includes a DC converter 121, an output capacitor 122 and a controller 123. The DC converter 121 is connected to the output of the AC/DC converting unit 11. Through the control of the controller 123, the AC/DC conversion unit 11 is changed to output a DC voltage and stored in the output capacitor 122. A programmable load 13 is connected to the output capacitor 122 of the adjustable DC conversion unit 12 to the DC. The power supply bus DC BUS is connected to the DC power supply end of the external power supply; a control and communication unit 14 is electrically connected to the pulse width of the controller 123 of the adjustable DC conversion unit 12 Modulating the input terminal, and connecting to the programmable load 13 through a switch 131, and then connecting the DC bus DC BUS to obtain the current voltage value and current value; The system control and communication unit 14 includes a power supply state for the interface connector 141, and a computer communications computer 20 for external connection interface 142.

The user directly selects the corresponding battery charge and discharge simulation according to the required rechargeable battery of the power supply 30 of the test machine, and selects and transmits the charge and discharge simulation command to the control and communication unit 14 through the external computer 20, and the control and communication is performed. The unit 14 controls the adjustable DC conversion unit 12 and the programmable battery 13 mode battery charging and discharging state, and allows the external power supply 30 to perform a test procedure; please refer to FIG. 2A and FIG. 2B for the battery simulation device 10 described above. Simulate the charging and discharging waveforms, which are further explained below.

When receiving the battery charging command from the charger 31 of the external power supply 30 through the computer communication interface 142 and receiving the charging analog control parameter of the external computer 20, the pulse width modulation signal is output to the controller 123 of the DC conversion unit 12, And then controlling the switch 131 to be turned on to start the programmable load 13, connecting the programmable load 13 to the DC power bus DC BUS, and controlling the programmable load 13 to be equivalent to a fixed load, and then controlling with time The output voltage of the DC conversion unit gradually rises, so that the analog power supply 30 charges the rechargeable battery; when the voltage rises to the floating charging voltage, the charger of the external power supply stops outputting the battery charging command after detecting; The load of the controllable load 13 is further reduced, so that the charging current of the DC power bus DC BUS is lowered, and the output voltage is maintained stable. Therefore, during the charging simulation process, the voltage and current of the DC power bus DC BUS must also be detected to calculate the total charging power.

When receiving the battery discharge command from the power supply 30 charger 31 and the discharge simulation control parameter input by the external computer 20 through the computer communication interface 142, firstly, the control switch 131 is not turned on, so that the programmable load 13 is self-contained. The DC power bus DC BUS is disconnected, and the pulse width modulation signal width of the controller 123 outputted to the DC conversion unit 12 is adjusted according to time, so that the output voltage of the DC conversion unit 12 gradually decreases, thereby simulating the AC power interruption. The power supply device 30 is discharged by the rechargeable battery. At this time, the power supply internal controller 32 controls the DC power conversion circuit 33 of the power supply to convert the voltage of the rechargeable battery and output it for power supply. The voltage and current of the DC power bus DC BUS are detected, and the total discharge power and the remaining power of the discharge battery currently set are calculated to determine whether the cutoff voltage is reached, and after the cutoff voltage is reached, the cutoff signal is output to the state interface 141. , the power supply 30 of the test machine is obtained, and the current battery simulation device 10 has been lower than the cutoff voltage; When the state interface 141 obtains the charger 31 of the power supply 30 to return the continuous discharge command, the overdischarge phenomenon is simulated until the calculated discharge power has reached the minimum amount.

Referring to FIG. 3, it is another preferred embodiment of the battery simulation device of the present invention. Most of the structures are substantially the same as those of the first preferred embodiment, but the programmable load of the embodiment is continuous current communication. The converter 13a is further connected to the input end of the AC/DC converting unit 11; thus, when the programmable load is enabled in the discharge simulation, the current of the DC current drawn from the DC power bus DC BUS can be converted into After the current of the alternating current is fed back to the input end of the direct current converting unit 12, the alternating current power source is used as a power supply for charging simulation, and the direct current power supply bus DC BUS is compared with FIG. 1 or when there is an analog load for analog charging. The extracted DC power is converted into heat energy consumption, which has better energy saving effect.

In summary, the present invention is mainly connected directly to an external computer by the control and communication unit, so the user can directly select the corresponding battery charge and discharge simulation program and parameters according to the rechargeable battery required by the power supply of the test machine. Floating charge voltage, cutoff voltage, voltage rise slope, voltage drop slope, etc.), after selection, the charge and discharge analog command is transmitted to the control and communication unit through an external computer, and the battery simulation is automatically performed for the electric equipment to perform the test procedure; Therefore, it is not necessary for the user to purchase expensive software for different power supply devices. As long as the external computer is connected with the present invention, the appropriate battery charging and discharging simulation program can be selected to automatically complete the test program; Since the power supply of the DC conversion unit of the present invention is provided by the AC/DC conversion unit, it is not necessary to provide a battery for power supply, and the overall structure can be effectively reduced, and the power supply is subjected to overcharge and overdischarge tests, and there is no such thing. Damage to the physical battery.

10. . . Battery simulator

11. . . AC/DC converter unit

12. . . Adjustable DC conversion unit

12a. . . DC to AC converter

121. . . DC converter

122. . . Output capacitor

123. . . Controller

13. . . Programmable load

131. . . switch

14. . . Control and communication unit

141. . . Status interface

142. . . Computer communication interface

20. . . computer

30. . . Power Supplier

31. . . charger

32. . . Controller

33. . . DC power conversion circuit

50. . . Battery charge and discharge simulator

51. . . DC power unit

511. . . battery

52. . . Electronic analog load

53. . . Master control unit

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a functional block diagram of a preferred embodiment of a battery simulation device of the present invention.

2A and 2B are diagrams showing simulated charging and discharging waveforms of the battery simulation device of the present invention.

Figure 3 is a functional block diagram of another preferred embodiment of the battery simulation device of the present invention.

4A and 4B are waveform diagrams of battery charge and discharge characteristics generally seen.

Figure 5 is a functional block diagram of a preferred embodiment of an existing battery simulation device.

10. . . Battery simulator

11. . . AC/DC converter unit

12. . . Adjustable DC conversion unit

121. . . DC converter

122. . . Output capacitor

123. . . Controller

13. . . Programmable load

131. . . switch

14. . . Control and communication unit

141. . . Status interface

142. . . Computer communication interface

20. . . computer

30. . . Power Supplier

31. . . charger

32. . . Controller

33. . . DC power conversion circuit

Claims (4)

A battery simulation device includes: an AC/DC conversion unit connected to an AC power source to convert AC power to DC power; an adjustable DC conversion unit connected to the AC/DC conversion unit and including a DC converter An output capacitor and a controller; wherein the DC converter is connected to the output end of the AC/DC conversion unit, and the DC voltage of the AC/DC conversion unit is changed and stored in the output capacitor through control of the controller; The stylized load is connected to the DC power supply busbar of the adjustable DC conversion unit, and the DC power supply bus is connected to the DC power supply end of the external power supply; a control and communication unit is electrically connected And the pulse width modulation input end of the controller of the adjustable DC conversion unit is connected to the programmable load through a switch, and then connected to the DC bus to obtain the current voltage value and current value; The control and communication unit includes a status interface for the power supply connection, and the control and communication unit It includes a connection for an external PC computer communication interface. The battery simulation device of claim 1, wherein the programmable load is a DC-to-AC converter and is further connected to an input of the AC/DC conversion unit. The battery simulation device according to claim 1 or 2, wherein the control and communication unit is a built-in charging and discharging simulation program, wherein: when receiving an incoming battery charging analog command from an external computer, the output pulse width modulation Signal to the controller of the DC conversion unit, and then control the switch to turn on to start the programmable load, connect the load to the DC power bus, and control the programmable load equivalent to a fixed load, and then control over time The output voltage of the DC conversion unit gradually rises until the voltage rises to the floating charging voltage; after that, the load of controlling the programmable load becomes smaller, so that the charging current of the DC power busbar decreases, and the output voltage remains stable; and during this period, It is also necessary to detect the voltage and current of the DC power bus and calculate the total charge; when receiving the battery discharge analog command from the external computer, the control switch is not turned on, so that the programmable load is disconnected from the DC power bus. And adjusting the pulse width modulation signal width of the controller outputted to the DC conversion unit according to time increase, so that the DC conversion The output voltage of the unit gradually decreases. At the same time, by detecting the voltage and current of the DC power bus, the total discharge capacity and the remaining capacity of the discharge battery currently set are calculated to determine whether the cutoff voltage is reached, and after the cutoff voltage is reached. That is, the output cutoff signal is sent to the state interface, so that the power supply of the test machine has obtained the current battery simulation device has been lower than the cutoff voltage. For example, in the battery simulation device described in claim 3, the control and communication unit receives the status interface return command simultaneously in the execution of the discharge simulation program, and still receives the continuous discharge command after determining that the cutoff voltage is reached. The over-discharge phenomenon is simulated until the discharge power has reached the minimum charge, and the discharge simulation program is terminated.