High-frequency alternating-current voltage analog circuit

Abstract

The utility model provides a high-frequency AC voltage analog circuit. The high-frequency AC voltage analog circuit comprises a power supply module; the signal generator is used for generating an initial alternating current voltage with a preset frequency; the signal isolator is connected with the power supply module and the signal generator, can output the initial alternating-current voltage as a first alternating-current voltage and a second alternating-current voltage of differential signals, and has an electrical isolation function; and the power operational amplifier is connected with the power supply module and the signal isolator and can amplify the first alternating voltage and the second alternating voltage and output a third alternating voltage, and the third alternating voltage is provided for a battery management system for testing. The high-frequency alternating-current voltage analog circuit can simulate high-frequency alternating-current voltage, is low in cost and achieves miniaturization.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy automobile field especially relates to a high -frequency alternating voltage analog circuit. BACKGROUND

[0002] In the field of new energy vehicles, the battery management system (BMS) plays a crucial role in the reliable operation and safety of the battery. It needs to monitor and manage the voltage, current, temperature and other parameters of the battery to achieve this goal. Among them, the battery voltage simulation device is an important device indispensable in the product development stage of the battery management system. It needs to provide high-precision battery voltage signals to comprehensively test and verify the voltage detection and equalization discharge functions of the battery management system.

[0003] However, due to the large variation of battery voltage under different working conditions, including the variation of alternating voltage, a high-frequency alternating voltage source capable of simulating these changes is needed to facilitate testing and verification of the performance of the battery management system in a laboratory environment.

[0004] The voltage simulation circuit in the prior art mainly uses a direct current voltage source to simulate the voltage variation of the battery by adjusting the set value of the output voltage. However, this scheme can only simulate the variation of direct current voltage and cannot simulate the variation of alternating voltage. Moreover, the frequency of the direct current voltage source is low and cannot meet the needs of high-frequency testing. SUMMARY

[0005] In view of the above problems of the prior art, the purpose of the utility model is to provide a high-frequency alternating voltage simulation circuit that can simulate high-frequency alternating voltage, has low cost and realizes miniaturization.

[0006] To solve the above problems, the utility model provides a high-frequency alternating voltage simulation circuit, which comprises:

[0007] a power module;

[0008] a signal generator for generating an initial alternating voltage of a predetermined frequency;

[0009] a signal isolator connected to the power module and the signal generator, capable of outputting the initial alternating voltage as a first alternating voltage and a second alternating voltage of differential signals, and having an electrical isolation function;

[0010] a power operational amplifier connected to the power module and the signal isolator, capable of amplifying the first alternating voltage and the second alternating voltage, and outputting a third alternating voltage, which is used to provide a battery management system for testing.

[0011] Further, the power module is capable of providing a first voltage and a second voltage, the signal isolator is an isolation operational amplifier, and the isolation operational amplifier comprises:

[0012] a signal input end connected to the signal generator to receive the initial AC voltage;

[0013] a primary-side power voltage end connected to the power module to receive the first voltage;

[0014] a secondary-side power voltage end connected to the power module to receive the second voltage;

[0015] a positive output end and a negative output end connected to the power operational amplifier to output the first AC voltage and the second AC voltage to the power operational amplifier.

[0016] Further, the power module is capable of providing a third voltage and a fourth voltage, the power operational amplifier comprises:

[0017] a positive power end connected to the power module to receive the third voltage;

[0018] a negative power end connected to the power module to receive the fourth voltage;

[0019] a first non-inverting input end connected to the positive output end of the isolation operational amplifier to receive the first AC voltage;

[0020] a first inverting input end connected to the negative output end of the isolation operational amplifier to receive the second AC voltage;

[0021] a voltage output end capable of outputting a third AC voltage, the voltage output end being used for connecting a battery management system.

[0022] Further, the high-frequency AC voltage analog circuit further comprises:

[0023] a first resistor connected between the positive output end of the isolation operational amplifier and the first non-inverting input end of the power operational amplifier;

[0024] a second resistor connected between the first inverting input end of the power operational amplifier and the voltage output end of the power operational amplifier.

[0025] Further, the first resistor comprises a first adjustable resistor, and / or the second resistor comprises a second adjustable resistor.

[0026] Further, the power module is capable of providing a fifth voltage, and the high-frequency alternating voltage analog circuit further comprises a first double-channel operational amplifier, the first double-channel operational amplifier comprising:

[0027] a second noninverting input end connected to the power module through a third resistor;

[0028] a second inverting input end and a first output end, the first output end connected to the second inverting input end, and the first output end further connected between a positive output end of the isolation operational amplifier and a first noninverting input end of the power operational amplifier.

[0029] Further, the third resistor comprises a third adjustable resistor.

[0030] Further, the power module is capable of providing a sixth voltage, and the high-frequency alternating voltage analog circuit further comprises a second double-channel operational amplifier, the second double-channel operational amplifier comprising:

[0031] a third noninverting input end connected to the power module through a fourth resistor to receive the sixth voltage;

[0032] a third inverting input end and a second output end, the second output end connected to the third inverting input end, and the second output end further connected between a negative output end of the isolation operational amplifier and a first inverting input end of the power operational amplifier.

[0033] Further, the power module comprises an isolation power supply, and the isolation power supply is capable of providing the first voltage and the second voltage.

[0034] Further, the high-frequency alternating voltage analog circuit comprises a plurality of high-frequency alternating voltage analog circuits connected in series.

[0035] Thanks to the above technical scheme, the utility model has the following beneficial effects:

[0036] According to the high-frequency alternating voltage analog circuit, the power module provides power required for the operation of the signal isolator and the power operational amplifier. The signal generator sends an initial alternating voltage of a predetermined frequency, and the signal isolator electrically isolates the initial alternating voltage and outputs a first alternating voltage and a second alternating voltage of a differential signal. The power operational amplifier amplifies the first alternating voltage and the second alternating voltage and outputs a third alternating voltage meeting the testing requirements of the battery management system. Thus, miniaturization can be realized at low cost, and the alternating voltage of the battery under different working conditions can be simulated with high precision, thereby providing a more realistic environment for the research and testing of the battery management system and meeting the requirements of high-frequency testing. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical scheme of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0038] Figure 1 is a circuit diagram of the high-frequency alternating voltage simulation circuit according to an embodiment of the present application;

[0039] Figure 2 is Figure 1 The circuit diagram of the power supply of the high-frequency alternating voltage simulation circuit of the embodiment.

[0040] Reference signs:

[0041] U301, isolation operational amplifier; U302, first isolated power supply; U303, second isolated power supply; U304, linear power supply; U304A, first dual-channel operational amplifier; U304B, second dual-channel operational amplifier; U305, power operational amplifier. DETAILED DESCRIPTION

[0042] In order to make the person skilled in the art better understand the present application scheme, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0043] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0044] Next, the high-frequency alternating voltage simulation circuit of the embodiment of the present application is described.

[0045] As Figure 1 and Figure 2As shown, the high-frequency alternating voltage simulation circuit of the embodiment of the utility model includes power module, signal generator, signal isolator and power operational amplifier U305.

[0046] Firstly, the power module is explained. The power module can provide power for other components.

[0047] Optionally, the power module can include isolated power supply and linear power supply U304.

[0048] As Figure 2 As shown, the power module includes three power supplies, the first power supply is the first isolated power supply U302 (positive power supply, providing +9V voltage), the second power supply is the second isolated power supply U303 (negative power supply, providing -3V voltage), and the third power supply is the linear power supply U304 (providing 5V voltage).

[0049] Next, the signal generator is explained. The signal generator is used to generate initial alternating voltage of predetermined frequency.

[0050] For example, the signal generator generates initial alternating voltage of 0-200KHZ, so that the high-frequency alternating voltage of the battery can be simulated, thereby providing a more realistic environment for the research and development and testing of the battery management system, and meeting the needs of high-frequency testing.

[0051] Next, the signal isolator is explained. The signal isolator is connected to the power module and the signal generator, and can output the initial alternating voltage as the first alternating voltage and the second alternating voltage of differential signal, and the signal isolator has electrical isolation function.

[0052] The power module connected to the signal isolator can provide the power required for the operation of the signal isolator.

[0053] The initial alternating voltage is output as the first alternating voltage and the second alternating voltage of differential signal, which can effectively improve the anti-interference ability, reduce electromagnetic radiation, and improve the signal integrity.

[0054] The high-frequency alternating voltage simulation circuit includes high-voltage side circuit (circuit for connecting with the battery management system) and low-voltage side circuit (circuit of low voltage at input end).

[0055] The signal isolator can isolate the low-voltage side circuit and the high-voltage side circuit, has higher safety, and has stronger anti-interference performance.

[0056] Next, the power operational amplifier U305 is explained. The power operational amplifier U305 is connected to the power module and the signal isolator, can amplify the first alternating voltage and the second alternating voltage, and output the third alternating voltage, which is used to provide for the battery management system for testing.

[0057] The power operational amplifier U305 can amplify the first alternating voltage and the second alternating voltage, and output a third alternating voltage meeting the test requirement of the battery management system.

[0058] The power module can provide power required by the signal isolator to operate.

[0059] The high-frequency alternating voltage simulation circuit can simulate the alternating voltage of the battery under different working conditions with high precision, and provide a more real environment for the research and test of the battery management system, and meet the requirement of high-frequency test.

[0060] In some embodiments of the utility model, the power module can provide a first voltage and a second voltage, and the signal isolator is an isolation operational amplifier U301. The isolation operational amplifier U301 comprises a signal input end, a primary side power voltage end, a secondary side power voltage end, a positive output end and a negative output end. The signal input end is connected to the signal generator to receive an initial alternating voltage. The primary side power voltage end is connected to the power module to receive the first voltage. The secondary side power voltage end is connected to the power module to receive the second voltage. The positive output end and the negative output end are connected to the power operational amplifier U305 to output the first alternating voltage and the second alternating voltage to the power operational amplifier U305.

[0061] Optionally, the isolation operational amplifier U301 is an ISO224BDWV type isolation operational amplifier U301, so that electrical isolation, noise suppression and signal integrity protection can be realized, and the safety, stability and reliability of the high-frequency alternating voltage simulation circuit are significantly improved.

[0062] As shown in FIG. 1 and FIG. 2, the signal input end (IN end) of the isolation operational amplifier U301 is connected to the signal generator (FG), and the positive output end (OUTP end) and the negative output end (OUTN end) are connected to the power operational amplifier U305, so as to convert the primary alternating voltage into the first alternating voltage and the second alternating voltage, and output the first alternating voltage and the second alternating voltage to the power operational amplifier U305. The power module provides the first voltage (+12V) to the primary side power voltage end (VDD1 end), and provides the second voltage (+5V) to the secondary side power voltage end (VDD2 end), so as to maintain the operation of the isolation operational amplifier. Figure 1 Figure 2 As shown in FIG. 1 and FIG. 2, the signal input end (IN end) of the isolation operational amplifier U301 is connected to the signal generator (FG), and the positive output end (OUTP end) and the negative output end (OUTN end) are connected to the power operational amplifier U305, so as to convert the primary alternating voltage into the first alternating voltage and the second alternating voltage, and output the first alternating voltage and the second alternating voltage to the power operational amplifier U305. The power module provides the first voltage (+12V) to the primary side power voltage end (VDD1 end), and provides the second voltage (+5V) to the secondary side power voltage end (VDD2 end), so as to maintain the operation of the isolation operational amplifier.​

[0063] In some embodiments of the utility model, power module can provide third voltage and fourth voltage. Power operational amplifier U305 includes positive power end, negative power end, first same phase input end, first reverse input end and voltage output end. Positive power end connects power module to receive third voltage. Negative power end connects power module to receive fourth voltage. First same phase input end connects the positive output end of isolation operational amplifier U301 to receive first alternating voltage. First reverse input end connects the negative output end of isolation operational amplifier U301 to receive second alternating voltage. Voltage output end can output third alternating voltage, and voltage output end is used to connect battery management system.

[0064] Optionally, power operational amplifier U305 is OPA551FA type power operational amplifier U305. Through OPA551FA type power operational amplifier U305, wide power voltage range can be had, so that relatively wide voltage range can be provided to battery management system for testing, wide temperature range is had, adaptation to various environments is had, and high common mode rejection ratio and high open loop gain are had.

[0065] As Figure 1 , Figure 2 (a) and Figure 2 (c) as shown in the figure, the positive power end (V+ end) and the negative power end (V- end) of power operational amplifier U305 connect power module, and the positive power end accesses the third voltage (+ 9V voltage) provided by the first isolated power supply U302 of power module, and the negative voltage end accesses the fourth voltage (- 3V voltage) provided by the second isolated power supply U303 of power module, so as to maintain the operation of power operational amplifier U305.

[0066] After receiving first alternating voltage through first positive input end (VIN+ end) and receiving second alternating voltage through first reverse input end (VIN- end) and amplifying, third alternating voltage meeting the test requirements of battery management system is output through voltage output end (VO end).

[0067] Moreover, power operational amplifier U305 can provide larger current driving capability (for example, 200mA continuous large current output), can more truly simulate the condition of battery, and has higher driving capability, does not need to be externally connected buffer circuit, and can simplify design.

[0068] Further, the high-frequency alternating voltage simulation circuit further comprises a first resistor and a second resistor. The first resistor is connected between the positive output end of the isolation operational amplifier U301 and the first same phase input end of the power operational amplifier U305. The second resistor is connected between the first reverse input end of the power operational amplifier U305 and the voltage output end of the power operational amplifier U305.

[0069] The amplification factor formula for the isolation operational amplifier U301 is as follows: A v =1+R f / R in Among them, R in The resistance of the first resistor is R. f It is the resistance of the second resistor, A. v It is the magnification factor.

[0070] For example, such as Figure 1 As shown, the first resistor is R306 and the second resistor is R307.

[0071] By setting or adjusting the resistance of the first and second resistors, different amplification factors can be achieved, thereby outputting different third AC voltages to meet the different testing requirements of the battery management system.

[0072] Optionally, the first resistor includes a first adjustable resistor, and / or the second resistor includes a second adjustable resistor.

[0073] The amplification factor can be easily adjusted by using the first adjustable resistor and / or the second adjustable resistor, increasing the timeliness and accuracy of the adjustment.

[0074] In some embodiments of this invention, the power supply module is capable of providing a fifth voltage. The high-frequency AC voltage analog circuit also includes a first dual-channel operational amplifier U304A, which includes a second non-inverting input, a second inverting input, and a first output. The second non-inverting input is connected to the power supply module via a third resistor. The first output is connected to the second inverting input and is also connected between the positive output of the isolation operational amplifier U301 and the first non-inverting input of the power operational amplifier U305.

[0075] Optionally, the first dual-channel operational amplifier U304A is a TSV912AID type dual-channel operational amplifier. This provides advantages including electrical isolation, high precision, wide input voltage range, high noise immunity, low power consumption, and a wide temperature range.

[0076] The first dual-channel operational amplifier U304A provides voltage bias and gain and bias compensation for the circuit between the positive output of the isolation operational amplifier U301 and the first non-inverting input of the power operational amplifier U305.

[0077] like Figure 1 and Figure 2 As shown in (b), the second non-inverting input terminal (terminal 3) is connected to the power supply module through the third resistor so that the fifth voltage (+5V voltage) is supplied by the linear power supply U304 of the power supply module.

[0078] The first output end (1 end) is connected with the second reverse input end (2 end), and the first output end (1 end) is also connected between the positive output end of the isolation operational amplifier U301 and the first non-inverting input end of the power operational amplifier U305.

[0079] Therefore, the first alternating voltage output by the positive output end of the isolation operational amplifier U301 can be compensated and corrected, and voltage bias, gain and bias compensation can be provided.

[0080] Further, the third resistor comprises a third adjustable resistor.

[0081] As shown in Figure 1 The third resistor (R302 / RV301 / R303) comprises a third adjustable resistor. The resistance of the third adjustable resistor can be adjusted conveniently, so that the first alternating voltage can be compensated and corrected more accurately and timely.

[0082] In some embodiments of the utility model, the power module can provide a sixth voltage. The high-frequency alternating voltage analog circuit further comprises a second dual-channel operational amplifier U304B, and the second dual-channel operational amplifier U304B comprises a third non-inverting input end, a third reverse input end and a second output end. The third non-inverting input end is connected with the power module through a fourth resistor to receive the sixth voltage. The second output end is connected with the third reverse input end, and the second output end is also connected between the negative output end of the isolation operational amplifier U301 and the first reverse input end of the power operational amplifier U305.

[0083] Optionally, the second dual-channel operational amplifier U304B is a TSV912AID type dual-channel operational amplifier. Therefore, the second dual-channel operational amplifier U304B has the advantages of electrical isolation, high precision, wide input voltage range, high anti-interference capability, low power consumption and wide temperature range.

[0084] As shown in Figure 1 and Figure 2 As shown in (b), the third non-inverting input end (3 end) is connected with the power module through a fourth resistor to be powered by the sixth voltage (+5V voltage) provided by the linear power supply U304 of the power module.

[0085] The second output end (1 end) is connected with the third reverse input end (2 end), and the second output end (1 end) is also connected between the negative output end of the isolation operational amplifier U301 and the first reverse input end of the power operational amplifier U305. Therefore, a voltage follower can be formed to realize high-precision buffering and impedance matching of signals.

[0086] Therefore, the second alternating voltage output by the negative output end of the isolation operational amplifier U301 can be compensated and corrected, and voltage bias, gain and bias compensation can be provided.

[0087] In some embodiments of the utility model, high frequency alternating voltage analog circuit includes a plurality, a plurality of high frequency alternating voltage analog circuit series connection.

[0088] Therefore, high frequency alternating voltage analog circuit modularization can be realized, voltage simulation of single battery is realized, a plurality of modules are connected in series to provide a plurality of voltages for the battery management system, and more extensive test requirements of the battery management system are met.

[0089] The above are only the preferred embodiments of the utility model, and are not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A high frequency alternating voltage analog circuit, characterized by, The high-frequency alternating voltage analog circuit comprises: a power module; a signal generator, configured to generate an initial alternating voltage of a predetermined frequency; a signal isolator, connected to the power module and the signal generator, and capable of outputting the initial alternating voltage as a first alternating voltage and a second alternating voltage of a differential signal, the signal isolator having an electrical isolation function; a power operational amplifier, connected to the power module and the signal isolator, and capable of amplifying the first alternating voltage and the second alternating voltage to output a third alternating voltage, the third alternating voltage being configured to be provided to a battery management system for testing.

2. The high-frequency ac voltage analog circuit according to claim 1, characterized in that The power module is capable of providing a first voltage and a second voltage, the signal isolator is an isolation operational amplifier, and the isolation operational amplifier comprises: a signal input end, connected to the signal generator to receive the initial alternating voltage; a primary side power voltage end, connected to the power module to receive the first voltage; a secondary side power voltage end, connected to the power module to receive the second voltage; a positive output end and a negative output end, connected to the power operational amplifier to output the first alternating voltage and the second alternating voltage to the power operational amplifier.

3. The high-frequency ac voltage analog circuit according to claim 2, characterized in that The power module is capable of providing a third voltage and a fourth voltage, and the power operational amplifier comprises: a positive power end, connected to the power module to receive the third voltage; a negative power end, connected to the power module to receive the fourth voltage; a first non-inverting input end, connected to the positive output end of the isolation operational amplifier to receive the first alternating voltage; a first inverting input end, connected to the negative output end of the isolation operational amplifier to receive the second alternating voltage; a voltage output end, capable of outputting a third alternating voltage, and configured to be connected to a battery management system.

4. The high-frequency ac voltage analog circuit according to claim 3, characterized in that The high-frequency alternating voltage analog circuit further comprises: a first resistor, connected between the positive output end of the isolation operational amplifier and the first non-inverting input end of the power operational amplifier; a second resistor, connected between the first inverting input end of the power operational amplifier and the voltage output end of the power operational amplifier.

5. The high-frequency ac voltage analog circuit according to claim 4, characterized in that The first resistor comprises a first adjustable resistor, and / or the second resistor comprises a second adjustable resistor.

6. The high-frequency ac voltage analog circuit according to claim 2, characterized in that The power module is capable of providing a fifth voltage, and the high-frequency alternating voltage analog circuit further comprises a first dual-channel operational amplifier, which comprises: a second non-inverting input end, connected to the power module through a third resistor; a second inverting input end and a first output end, the first output end being connected to the second inverting input end, and the first output end also being connected between the positive output end of the isolation operational amplifier and the first non-inverting input end of the power operational amplifier.

7. The high-frequency ac voltage analog circuit according to claim 6, characterized in that The third resistor comprises a third adjustable resistor.

8. The high-frequency ac voltage analog circuit according to claim 7, characterized in that The power module is capable of providing a sixth voltage, and the high-frequency alternating voltage analog circuit further comprises a second double-channel operational amplifier, the second double-channel operational amplifier comprising: a third non-inverting input end connected to the power module through a fourth resistor to receive the sixth voltage; a third inverting input end and a second output end, the second output end being connected to the third inverting input end, and the second output end being further connected between a negative output end of the isolation operational amplifier and a first inverting input end of the power operational amplifier.

9. The high-frequency ac voltage analog circuit according to claim 2, characterized in that The power module comprises an isolation power supply, and the isolation power supply is capable of providing the first voltage and the second voltage.

10. The high-frequency ac voltage analog circuit according to claim 1, characterized in that The high-frequency alternating voltage analog circuit comprises a plurality of high-frequency alternating voltage analog circuits connected in series.

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