Battery voltage simulation circuit

Abstract

The utility model provides a battery voltage simulation circuit. The battery voltage simulation circuit comprises a power supply module; a plurality of first isolation switches through which a plurality of switching signals can be generated; the multi-path voltage division circuit is connected with the power supply module, and the resistance values of all the paths of voltage division circuits are different, so that shunt voltages of different gears are formed on the different paths of voltage division circuits; the gating chip is connected with the power supply module, the gating chip comprises a plurality of selection ends, a plurality of address ends and a voltage output end, the plurality of selection ends are connected with the plurality of first isolation switches in a one-to-one correspondence manner, and the plurality of address ends are connected with the plurality of voltage division circuits in a one-to-one correspondence manner; and the gating chip can select one of the corresponding multiple paths of voltage division circuits to the voltage output end based on the switching signal received by the selection end, so that the voltage output end can output a predetermined branch voltage of a predetermined gear to the battery management system. The battery voltage simulation circuit can save cost and realize miniaturization.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy automobile field, especially a battery 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, the existing battery voltage analog circuit has many problems in miniaturization and low cost. First of all, the existing circuit needs a large number of high-precision components such as digital-to-analog converters, reference power supplies, single-chip microcomputers, etc., which not only increases the complexity and cost of the circuit, but also increases the volume of the circuit, making it difficult to meet the miniaturization needs in the battery management system development and testing process. Secondly, the existing device is extremely expensive, usually more than 10,000 yuan per channel, and 100-channel testing equipment requires 1 million yuan. According to the general development process, 30 sets of equipment are needed, which requires 30 million yuan, causing great economic burden to enterprises. SUMMARY

[0004] In view of the above problems of the prior art, the purpose of the utility model is to provide a battery voltage analog circuit that can save cost and achieve miniaturization.

[0005] In order to solve the above problems, the utility model provides a battery voltage analog circuit, which comprises:

[0006] a power module;

[0007] a plurality of first disconnecting switches, which can generate a plurality of switching signals;

[0008] a plurality of multi-channel voltage dividing circuits, each channel of the voltage dividing circuit being connected to the power module, and each channel of the voltage dividing circuit having a different resistance value, thereby forming a voltage dividing circuit with different voltage levels on different channels of the voltage dividing circuit;

[0009] A gate chip is connected to the power module, the gate chip includes a plurality of selection terminals, a plurality of address terminals and a voltage output terminal, a plurality of the selection terminals are connected to a plurality of the first isolation switches one by one, a plurality of the address terminals are connected to a plurality of the voltage dividing circuits one by one, the gate chip can select one of a plurality of the voltage dividing circuits based on the switch signal received by the selection terminal to the voltage output terminal, so that the voltage output terminal outputs a predetermined voltage of a predetermined gear, and the voltage output terminal is used to connect a battery management system.

[0010] Further, the battery voltage analog circuit further comprises:

[0011] A reference power chip is arranged between the power module and a plurality of the voltage dividing circuits to provide a reference voltage for a plurality of the voltage dividing circuits.

[0012] Further, the battery voltage analog circuit further comprises:

[0013] A power amplification circuit is connected to the voltage output terminal of the gate chip, and the voltage output terminal is connected to the battery management system through the power amplification circuit.

[0014] Further, the power amplification circuit comprises:

[0015] A tracking type low voltage stabilizer comprises an input terminal, an adjustment terminal and an output terminal, the adjustment terminal of the tracking type low voltage stabilizer is connected to the voltage output terminal of the gate chip to track the predetermined voltage, the input terminal of the tracking type low voltage stabilizer is connected to the power module, and the output terminal of the tracking type low voltage stabilizer is used to connect the battery management system.

[0016] Further, the tracking type low voltage stabilizer has a current driving capability of 300mA.

[0017] Further, the battery voltage analog circuit further comprises:

[0018] A second isolation switch;

[0019] A triode, a base of the triode is connected to the second isolation switch, an emitter of the triode is connected between the power module and the input terminal of the tracking type low voltage stabilizer, and a collector of the triode is connected to an enable terminal of the tracking type low voltage stabilizer.

[0020] Further, the first isolation switch and / or the second isolation switch is an optocoupler chip.

[0021] Further, the voltage dividing circuit comprises:

[0022] An adjustable resistor, resistance of which is adjustable, the adjustable resistor comprising two fixed ends and an adjustable end, the voltage dividing circuit connecting the address end of the gating chip through the adjustable end of the adjustable resistor.

[0023] Further, the voltage dividing circuit further comprises:

[0024] A voltage dividing resistor, which is connected in series with the fixed end of the adjustable resistor.

[0025] Further, the power module is an isolated power supply.

[0026] Thanks to the above technical solution, the utility model has the following beneficial effects:

[0027] According to the battery voltage simulation circuit, the battery voltage simulation circuit forms multiple switch signals through multiple first isolation switches, the power module connects multiple voltage dividing circuits, different branch voltages are formed on different voltage dividing circuits, the multiple first isolation switches are connected to multiple selection ends of the gating chip respectively, the multiple voltage dividing circuits are connected to multiple address ends of the gating chip respectively, the on-off of the multiple first isolation switches is controlled to generate switch signals and input to the selection ends of the gating chip, and the gating chip selects one of the multiple voltage dividing circuits to the voltage output end based on the switch signals.

[0028] During the development and test of the battery management system, only specific voltage grades (for example, 1.5V, 2.5V, 3.6V, 5.0V, etc.) are needed for testing. The application deletes the traditional single-chip microcomputer and high-precision analog-digital conversion circuit and turns to a selection circuit with multiple voltage grades, greatly simplifies the number of components required by the circuit, reduces the complexity, thereby saves the cost, realizes miniaturization, and has high precision, high stability, high safety and strong anti-interference ability.

[0029] In addition, the battery voltage simulation circuit has high modularity, can conveniently connect multiple battery voltage simulation circuits in series, realizes function expansion, provides high-precision and high-stability voltage for the battery management system, and facilitates comprehensive test and verification of the battery management system. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0031] Figure 1It is a circuit diagram of a battery voltage simulation circuit according to an embodiment of the utility model.

[0032] Reference signs:

[0033] U301D, second isolating switch; U302, isolating power supply; U303, gating chip; U304, tracking type low voltage stabilizer; U305, reference power supply chip; Q301, triode. DETAILED DESCRIPTION

[0034] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0035] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model 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.

[0036] Next, the battery voltage simulation circuit of the embodiment of the utility model is described.

[0037] As Figure 1 Indicated, the battery voltage simulation circuit of the embodiment of the utility model includes: power module, a plurality of first isolating switch, a plurality of voltage divider circuit and gating chip U303.

[0038] First, the power module is described.

[0039] Optionally, the power module is an isolating power supply U302. Wherein, the isolating power supply U302 can be a power module with a transformer.

[0040] The whole voltage simulation circuit can be divided into low voltage side (external input low voltage) and high voltage side (circuit directly connected with battery management system).

[0041] The isolating power supply U302 of the application has a transformer, has electrical isolation effect, can convert the power supply of low voltage side into the power supply of high voltage side, improves safety, and can reduce the interference and noise to high voltage side and battery management system.

[0042] Next, the plurality of first disconnectors is described. The plurality of first disconnectors can generate a plurality of switch signals. Each first disconnector can generate a digital switch signal of 0 or 1.

[0043] The first disconnector can convert the switch signal of the low-voltage side into the switch signal of the high-voltage side, can reduce the interference and noise of the high-voltage side and the battery management system, and improve the safety.

[0044] As shown in Figure 1 There are three first disconnectors (U301A / U301B / U301C), so that eight switch signals (000 / 001 / 010 / 011 / 100 / 101 / 110 / 111) can be formed.

[0045] The number of first disconnectors is not limited above, and can also be four, five, etc., which should be understood within the scope of the present application.

[0046] Then, the multi-path voltage dividing circuit is described. The multi-path voltage dividing circuit is connected to the power module, and each path of the voltage dividing circuit has a different resistance value, so that different levels of branch voltages are formed on different paths of the voltage dividing circuit.

[0047] As shown in Figure 1 The voltage dividing circuit includes the following eight paths to form eight levels of branch voltages.

[0048] The first path of the voltage dividing circuit: directly outputs to form the first level of branch voltage.

[0049] The second path of the voltage dividing circuit: includes a circuit of resistors (R312, RV301, R322, R326) to form the second level of branch voltage.

[0050] The third path of the voltage dividing circuit: includes a circuit of resistors (R313, RV302, R323, R327) to form the third level of branch voltage.

[0051] The fourth path of the voltage dividing circuit: includes a circuit of resistors (R314, RV303, R324, R328) to form the fourth level of branch voltage.

[0052] The fifth path of the voltage dividing circuit: includes a circuit of resistors (R315, RV304, R325, R329) to form the fifth level of branch voltage.

[0053] The sixth path of the voltage dividing circuit: includes a circuit of resistors (R316, RV305, R326, R330) to form the sixth level of branch voltage.

[0054] The seventh path of the voltage dividing circuit: includes a circuit of resistors (R317, RV306, R327, R331) to form the seventh level of branch voltage.

[0055] The 8th voltage divider circuit includes resistors (R318, RV307, R328, R332) to form the 8th voltage level.

[0056] The number of voltage divider circuits is not limited above; it can also be 16, 32, etc., and these should all be understood within the scope of this application.

[0057] Next, the gating chip U303 will be explained. The gating chip U303 is connected to the power module. The gating chip U303 includes multiple selection terminals, multiple address terminals, and a voltage output terminal. The multiple selection terminals are connected to multiple first isolating switches in a one-to-one correspondence, and the multiple address terminals are connected to multiple voltage divider circuits in a one-to-one correspondence. The gating chip U303 can select one of the corresponding multiple voltage divider circuits to the voltage output terminal based on the switch signals received by the selection terminals, so that the voltage output terminal outputs a predetermined branch voltage at a predetermined level. The voltage output terminal is used to connect to the battery management system.

[0058] like Figure 1 As shown, the strobe chip U303 (VCC terminal) is connected to the power supply. The strobe chip U303 has 3 selection terminals (S0 / S1 / S2). The strobe chip U303 has 8 address terminals (A0 / A1 / A2 / A3 / A4 / A5 / A6 / A7). The voltage output terminal of the strobe chip U303 is terminal A.

[0059] Controlling the on / off state of multiple first isolating switches generates switching signals, which are input to the selection terminal of the selection chip U303. The selection chip U303 selects one of the multiple voltage divider circuits to the voltage output terminal based on the switching signals. For example, if the switching signal is 001, then the second voltage divider circuit is selected to the voltage output terminal, that is, the voltage output terminal outputs the second level of the shunt voltage to the battery management circuit.

[0060] The number of selection and address terminals of the strobe chip U303 is not limited here. They can be matched according to the number of first isolating switches and the number of voltage divider circuits. All of these should be understood within the scope of this application.

[0061] The above battery voltage simulation circuit generates multiple switching signals through multiple first isolating switches. The power module is connected to a multi-channel voltage divider circuit, which generates different branch voltages on different voltage divider circuits. The multiple first isolating switches are respectively connected to multiple selection terminals of the gating chip U303, and the multi-channel voltage divider circuit is respectively connected to multiple address terminals of the gating chip U303. The switching signals generated by controlling the opening and closing of the multiple first isolating switches are input to the selection terminals of the gating chip U303. The gating chip U303 selects one of the multi-channel voltage divider circuits to the voltage output terminal based on the switching signals.

[0062] The applicant's analysis of the battery management system research and development testing process reveals that only specific voltage levels (e.g., 1.5V, 2.5V, 3.6V, 5.0V, etc.) are required for testing. This application eliminates the traditional microcontroller and high-precision analog-to-digital converter circuit, replacing them with a selection circuit that offers multiple voltage levels. This significantly simplifies the number of components required, reduces complexity, saves costs, achieves miniaturization, and provides high precision, stability, safety, and strong anti-interference capabilities.

[0063] Furthermore, the battery voltage simulation circuit of this application is highly modular, which can easily connect multiple battery voltage simulation circuits in series to achieve functional expansion and provide high-precision and high-stability voltage for the battery management system, so as to facilitate comprehensive testing and verification of the battery management system.

[0064] In some embodiments of this invention, the battery voltage simulation circuit further includes a reference power supply chip U305. The reference power supply chip U305 is disposed between the power supply module and the multi-channel voltage divider circuit to provide a reference voltage to the multi-channel voltage divider circuit.

[0065] like Figure 1 As shown, the battery voltage simulation circuit also includes a reference power supply chip U305. The reference power supply chip U305 provides a reference voltage to the multi-channel voltage divider circuit. The reference power supply chip U305 can generate a stable reference voltage unaffected by temperature and input voltage fluctuations, which is used by the multi-channel voltage divider circuit. This improves the accuracy of the voltage output by the battery management system.

[0066] In some embodiments of this invention, the battery voltage simulation circuit further includes a power amplifier circuit. The power amplifier circuit is connected to the voltage output terminal of the gating chip U303, and the voltage output terminal is connected to the battery management system through the power amplifier circuit.

[0067] like Figure 1 As shown, the power amplifier circuit is connected to the voltage output terminal (A terminal) of the gating chip U303, and the power amplifier circuit is also connected to the battery management system.

[0068] The power amplifier circuit can be well integrated with the battery management system, providing the battery management system with a stable and accurate voltage.

[0069] Furthermore, the power amplifier circuit includes a tracking low-voltage regulator U304. The tracking low-voltage regulator U304 includes an input terminal, an adjustment terminal, and an output terminal. The adjustment terminal of the tracking low-voltage regulator U304 is connected to the voltage output terminal of the gating chip U303 to track a predetermined branch voltage. The input terminal of the tracking low-voltage regulator U304 is connected to the power module, and the output terminal of the tracking low-voltage regulator U304 is used to connect to the battery management system.

[0070] It should be noted that the tracking low voltage regulator U304 is only an optional example of the power amplification circuit, and the power amplification circuit can also be an operational amplifier, a power management circuit, etc., which should be understood to be within the scope of the present application.

[0071] As shown in Figure 1 The adjustment end (ADJ end) of the tracking low voltage regulator U304 is connected to the voltage output end (A end) of the gating chip U303, which tracks the predetermined shunt voltage and outputs the voltage to the battery management system. Thus, a stable predetermined shunt voltage can be input to the battery management system. The tracking low voltage regulator U304 can provide stable and mutually tracked voltage outputs to multiple voltage domains, ensuring that the voltage of each part of the battery voltage analog circuit changes synchronously, and avoiding performance problems or damage caused by voltage differences. The input end (IN end) of the tracking low voltage regulator U304 is connected to the power module to operate by power supply from the power module.

[0072] Further, the tracking low voltage regulator U304 has a current driving capability of 300mA.

[0073] The tracking low voltage regulator U304 can provide a current driving capability of 300mA, which can better simulate the current driving capability of an actual battery and match the battery management system, facilitating accurate testing by the battery management system.

[0074] In some embodiments of the present application, the battery voltage analog circuit further comprises a second isolation switch U301D and a triode. The base of the triode Q301 is connected to the second isolation switch U301D, the emitter of the triode Q301 is connected between the power module and the input end of the tracking low voltage regulator U304, and the collector of the triode Q301 is connected to the enable end (EN end) of the tracking low voltage regulator U304.

[0075] The second isolation switch U301D and the triode can control the on-off of the power supply module to the power module to the tracking low voltage regulator U304 and the operation of the tracking low voltage regulator U304, so as to control the on-off of the tracking low voltage regulator U304 to input the predetermined shunt voltage to the battery management system.

[0076] The second isolation switch U301D cooperates with the triode Q301 to control the on-off, which has strong advantages in efficiency, speed, life and automation, etc.

[0077] Further, the first isolation switch and / or the second isolation switch U301D is an optical coupling chip.

[0078] As shown in Figure 1As shown, 3 first disconnectors (U301A / U301B / U301C) and 1 second disconnector U301D are all optocoupler chips. The optocoupler chips can realize electrical isolation, have anti-interference, stable transmission and high-speed response characteristics, better realize generation and transmission of switch signals, and increase anti-interference of the battery simulation circuit.

[0079] In some embodiments of the utility model, the voltage dividing circuit package can be an adjustable resistor. The resistance of the adjustable resistor can be adjusted. The adjustable resistor comprises two fixed ends and an adjustable end. The voltage dividing circuit is connected to the address end of the gating chip U303 through the adjustable end of the adjustable resistor.

[0080] As shown in the figure, Figure 1 The voltage dividing circuit package comprises adjustable resistors (RV301 / RV302 / RV303 / RV304 / RV305 / RV306 / RV307). The adjustable resistors can realize compensation, adjustment and calibration of the branch voltage output by the voltage dividing circuit.

[0081] Further, the voltage dividing circuit further comprises voltage dividing resistors. The voltage dividing resistors are connected in series with the fixed ends of the adjustable resistors.

[0082] As shown in the figure, Figure 1 For example, in the second voltage dividing circuit, the voltage dividing resistors (R312 / R322 / R326) and the adjustable resistors (RV301) cooperate with each other to form the branch voltage.

[0083] The voltage dividing resistors realize the preliminary branch voltage of the branch voltage. The adjustable resistors accurately adjust the preliminary branch voltage, so that the high-precision branch voltage can be generated.

[0084] The above is only the preferred embodiment of the utility model, and does not limit the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery voltage analog circuit, characterized by, The battery voltage analog circuit comprises: a power module; a plurality of first isolation switches through which a plurality of switch signals can be generated; a plurality of voltage dividing circuits connected to the power module, each of the voltage dividing circuits having a different resistance value, so that different voltage dividing circuits form different voltage dividing voltages; a gating chip connected to the power module, the gating chip comprising a plurality of selection terminals, a plurality of address terminals and a voltage output terminal, the plurality of selection terminals being connected to the plurality of first isolation switches one by one, the plurality of address terminals being connected to the plurality of voltage dividing circuits one by one, the gating chip being capable of selecting one of the plurality of voltage dividing circuits based on the switch signals received by the selection terminals and outputting a predetermined voltage dividing voltage of a predetermined voltage dividing circuit to the voltage output terminal, the voltage output terminal being used to connect to a battery management system.

2. The battery voltage analog circuit according to claim 1, characterized by, The battery voltage analog circuit further comprises: a reference power chip arranged between the power module and the plurality of voltage dividing circuits to provide a reference voltage to the plurality of voltage dividing circuits.

3. The battery voltage analog circuit of claim 1, wherein, The battery voltage analog circuit further comprises: a power amplifier circuit connected to the voltage output terminal of the gating chip, the voltage output terminal being connected to the battery management system through the power amplifier circuit.

4. The battery voltage analog circuit of claim 3, wherein, The power amplifier circuit comprises: a tracking low voltage regulator comprising an input terminal, an adjustment terminal and an output terminal, the adjustment terminal of the tracking low voltage regulator being connected to the voltage output terminal of the gating chip to track the predetermined voltage dividing voltage, the input terminal of the tracking low voltage regulator being connected to the power module, and the output terminal of the tracking low voltage regulator being used to connect to the battery management system.

5. The battery voltage analog circuit of claim 4, wherein, The tracking low voltage regulator has a current driving capability of 300 mA.

6. The battery voltage analog circuit of claim 4, wherein, The battery voltage analog circuit further comprises: a second isolation switch; a transistor, the base of the transistor being connected to the second isolation switch, the emitter of the transistor being connected between the power module and the input terminal of the tracking low voltage regulator, and the collector of the transistor being connected to the enable terminal of the tracking low voltage regulator.

7. The battery voltage analog circuit of claim 6, wherein, The first isolation switch and / or the second isolation switch is an optocoupler chip.

8. The battery voltage analog circuit of claim 1, wherein, The voltage dividing circuit comprises: an adjustable resistor, the resistance of the adjustable resistor being adjustable, the adjustable resistor comprising two fixed terminals and an adjustable terminal, the voltage dividing circuit being connected to the address terminal of the gating chip through the adjustable terminal of the adjustable resistor.

9. The battery voltage analog circuit of claim 8, wherein, The voltage dividing circuit further comprises: a voltage dividing resistor connected in series with the fixed terminal of the adjustable resistor.

10. The battery voltage analog circuit of claim 1, wherein, The power module is an isolated power supply.

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