New energy automobile voltage monitoring circuit and vehicle

Abstract

The present disclosure provides a new energy automobile voltage monitoring circuit and a vehicle, and belongs to the technical field of automobile accessories. The new energy automobile voltage monitoring circuit comprises a voltage dividing circuit, a digital power supply, a threshold setting circuit and a comparator. The input end of the voltage dividing circuit is electrically connected with a first power supply, and the output end is electrically connected with the first end of the comparator. The input end of the threshold setting circuit is electrically connected with the digital power supply, and the output end is electrically connected with the second end of the comparator. The third end of the comparator is electrically connected with a DSP chip, the fourth end is electrically connected with the digital power supply, and the fifth end is grounded. The comparator is configured to output a high level at the third end when the output voltage of the voltage dividing circuit is greater than the output voltage of the threshold setting circuit. When the output voltage of the voltage dividing circuit is less than the output voltage of the threshold setting circuit, the third end outputs a low level. The voltage of the high level is less than or equal to the rated voltage of the DSP chip, which avoids the input voltage of the DSP chip exceeding the rated voltage and prolongs the service life of the DSP chip.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of automobile accessories, and in particular to a new energy automobile voltage monitoring circuit and vehicle. BACKGROUND

[0002] The low-voltage power supply on a new energy automobile generally starts the vehicle by a small battery, and the low-voltage power supply delivers voltage to a DSP (Digital Signal Processing) chip after passing through a voltage dividing circuit. The output voltage of the small battery is not a constant value, and is usually 9V-16V. Therefore, the input voltage of the DSP chip is also a range value. This easily causes the voltage delivered to the IO of the DSP chip after passing through the voltage converting circuit to be lower than the high-level threshold voltage or exceed the maximum allowed input voltage, resulting in the vehicle being unable to start or being unstable.

[0003] The commonly used solution is to simply divide the low-voltage power supply by resistance and then directly send it to the IO port of the DSP chip, by setting the minimum voltage of the low-voltage power supply to be greater than the high-level threshold of the DSP chip. For example, for a DSP chip with a 5V voltage platform, the IO port is divided by the low-voltage power supply of 9V under the premise that the high-level threshold is met. In this way, the voltage after the division of the 16V low-voltage power supply can still be greater than the high-level threshold. However, the maximum voltage of the low-voltage power supply may exceed the maximum allowed input voltage of the DSP chip, which will affect the service life, and long-term operation in this working state will damage the device, resulting in failure of the control system of the vehicle.

[0004] Therefore, how to avoid the input voltage of the DSP chip being higher than the rated voltage is a key problem to be solved. SUMMARY

[0005] The present disclosure provides a new energy automobile voltage monitoring circuit and vehicle, which can solve the technical problems in the related art. The technical solutions of the new energy automobile voltage monitoring circuit and vehicle are as follows.

[0006] In a first aspect, the present disclosure provides a new energy automobile voltage monitoring circuit, which comprises a voltage dividing circuit, a digital power supply, a threshold setting circuit and a comparator.

[0007] The input end of the voltage dividing circuit is electrically connected with a first power supply, and the output end is electrically connected with the first end of the comparator.

[0008] The input end of the threshold setting circuit is electrically connected with the digital power supply, and the output end is electrically connected with the second end of the comparator.

[0009] A third end of the comparator is configured to be electrically connected with a DSP (Digital Signal Processing) chip, a fourth end is electrically connected with the digital power supply, and a fifth end is grounded.

[0010] The comparator is configured to output a high level at the third end when the output voltage of the voltage dividing circuit is greater than the output voltage of the threshold setting circuit, and output a low level at the third end when the output voltage of the voltage dividing circuit is less than the output voltage of the threshold setting circuit, wherein the voltage of the high level is less than or equal to the rated voltage of the DSP chip.

[0011] In a possible implementation, the voltage value of the high level output by the comparator is equal to the rated voltage of the DSP chip.

[0012] The technical solution provided by the embodiments of the present disclosure can make the input voltage of the DSP chip always be the rated voltage of the DSP chip when the comparator outputs a high level, so that the DSP chip can be kept in an optimal running state and be more stable.

[0013] In a possible implementation, the voltage value of the second end is less than the rated voltage of the DSP chip.

[0014] The technical solution provided by the embodiments of the present disclosure can make the comparator output a high level when the output voltage of the voltage dividing circuit is less than the rated voltage of the chip, so as to drive the DSP chip.

[0015] In a possible implementation, the voltage value of the high level output by the comparator is equal to the voltage value output by the digital power supply.

[0016] In a possible implementation, the output voltage of the digital power supply is equal to the rated voltage of the DSP chip.

[0017] In a possible implementation, the voltage dividing circuit comprises a first resistor, a second resistor and a capacitor.

[0018] The first resistor and the second resistor are connected in series, and the capacitor and the second resistor are connected in parallel.

[0019] One end of the capacitor is electrically connected with the first end, and the other end is grounded.

[0020] In a possible implementation, the threshold setting circuit comprises a third resistor and a fourth resistor.

[0021] The digital power supply, the third resistor and the fourth resistor are connected in series.

[0022] One end of the fourth resistor is electrically connected with the second end, and the other end is grounded.

[0023] In a possible implementation, the resistance value of the third resistor is less than the resistance value of the fourth resistor.

[0024] In a possible implementation, the first end is a positive input end, and the second end is a negative input end.

[0025] In a possible implementation, the comparator includes a differential amplifier.

[0026] In a second aspect, the present disclosure provides a vehicle, the vehicle including a first power supply, a DSP chip, and the new energy vehicle voltage monitoring circuit according to any one of the first aspect.

[0027] The voltage dividing circuit of the new energy vehicle voltage monitoring circuit is electrically connected with the first power supply, and the third end of the comparator of the new energy vehicle voltage monitoring circuit is electrically connected with the DSP chip.

[0028] The technical solutions provided by the present disclosure have at least the following beneficial effects:

[0029] The present disclosure provides a new energy vehicle voltage monitoring circuit, in which a threshold setting circuit and a comparator are arranged. The voltage dividing circuit and the threshold setting circuit are electrically connected with the comparator, and the comparator compares the output voltage of the voltage dividing circuit with the output voltage of the threshold setting circuit. When the output voltage of the voltage dividing circuit is greater than the output voltage of the threshold setting circuit, the third end outputs a high level, and the voltage of the high level is less than or equal to the rated voltage of the DSP chip. When the output voltage of the voltage dividing circuit is less than the output voltage of the threshold setting circuit, the third end outputs a low level. In this way, the input voltage of the DSP chip can be prevented from exceeding the rated voltage, thereby prolonging the service life of the DSP chip.

[0030] In addition, even if the voltage output by the first power supply is a variable value, the voltage output by the voltage dividing circuit and the comparator is a fixed value, so that the input voltage of the DSP chip is relatively stable.

[0031] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure. In the drawings:

[0033] Figure 1 is a schematic diagram of a new energy vehicle monitoring circuit according to an embodiment of the present disclosure.

[0034] Figure 2 Figure 1 is a schematic diagram of a new energy vehicle monitoring circuit according to an embodiment of the present disclosure.

[0035] Legend:

[0036] 1, voltage dividing circuit, 11, first resistor, 12, second resistor, 13, capacitor;

[0037] 2, digital power supply;

[0038] 3, threshold setting circuit, 31, third resistor, 32, fourth resistor;

[0039] 4, comparator, 41, first end, 42, second end, 43, third end, 44, fourth end, 45, fifth end;

[0040] 100, first power supply;

[0041] 200, DSP chip.

[0042] The above figures have shown the specific embodiments of the present disclosure, which will be described in more detail hereinafter. These figures and textual descriptions are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be described in further detail below with reference to the accompanying drawings.

[0044] The terms used in the embodiments of the present disclosure are used only to explain embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, technical terms or scientific terms used herein have the same meaning as understood by those skilled in the art to which the present disclosure belongs. The terms "first", "second", "third", and the like used in the specification of the patent application and the claims of the present disclosure do not denote any sequence, quantity, or importance, but are used to distinguish different components. Similarly, "one" or "a" and the like do not denote a quantity limitation, but mean that at least one exists. "Include" or "contain" and the like mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0045] The low-voltage power supply on a new energy vehicle is generally started by a small battery, and the low-voltage power supply delivers voltage to a DSP (Digital Signal Processing) chip after passing through a voltage dividing circuit. The output voltage of the small battery is not a constant value, and is usually 9V-16V, so the input voltage of the DSP chip is also a range value. This easily causes the voltage delivered to the IO of the DSP chip after passing through the voltage conversion circuit to be lower than the high-level threshold voltage or exceed the maximum allowed input voltage, resulting in the vehicle being unable to start or being unstable.

[0046] The commonly used solution is to simply divide the low-voltage power supply by resistance and then directly send it to the IO port of the DSP chip, by setting the minimum voltage of the low-voltage power supply to be greater than the high-level threshold of the DSP chip. For example, for a 5V voltage platform DSP chip, the IO port is divided by the low-voltage power supply of 9V under the premise that the high-level threshold is met. In this way, the voltage after the division of the 16V low-voltage power supply can still be greater than the high-level threshold. However, the maximum voltage of the low-voltage power supply may exceed the maximum allowed input voltage of the DSP chip, which will affect the service life, and long-term operation in this state will damage the device, resulting in failure of the vehicle control system.

[0047] Therefore, how to avoid the input voltage of the DSP chip being higher than the rated voltage is a key problem to be solved.

[0048] In view of the above technical problems, the present embodiment provides a new energy automobile voltage monitoring circuit, which can avoid the input voltage of the DSP chip being too large. Next, the implementation of the new energy automobile voltage monitoring circuit is exemplarily described.

[0049] As shown in Figure 1 The new energy automobile voltage monitoring circuit includes a voltage dividing circuit 1, a digital power supply 2, a threshold setting circuit 3 and a comparator 4. The input end of the voltage dividing circuit 1 is electrically connected with a first power supply 100, and the output end is electrically connected with a first end 41 of the comparator 4. The input end of the threshold setting circuit 3 is electrically connected with the digital power supply 2, and the output end is electrically connected with a second end 42 of the comparator 4. A third end 43 of the comparator 4 is electrically connected with a DSP chip 200, a fourth end 44 is electrically connected with the digital power supply 2, and a fifth end 45 is grounded. The comparator 4 is configured to output a high level at the third end 43 when the output voltage of the voltage dividing circuit 1 is greater than the output voltage of the threshold setting circuit 3. The comparator 4 is configured to output a low level at the third end 43 when the output voltage of the voltage dividing circuit 1 is less than the output voltage of the threshold setting circuit 3. The voltage of the high level is less than or equal to the rated voltage of the DSP chip 200.

[0050] The output voltage of the first power supply 100 is a range value, such as 9V-16V.

[0051] The voltage of the first end 41 is the output voltage of the voltage dividing circuit 1, and the voltage value of the second end 42 is the output voltage of the threshold setting circuit 3. The output voltage of the threshold setting circuit 3 can be regarded as the reference voltage of the comparator 4. When the output voltage of the voltage dividing circuit 1 is equal to the output voltage of the threshold setting circuit 3, the third end 43 also outputs a high level.

[0052] The comparator 4 is a circuit device that compares the amplitudes of two analog input voltage or current signals and generates an output signal indicating whether one of the two analog input signals is greater than the amplitude of the other.

[0053] The rated voltage of the DSP chip 200 is less than the maximum allowable input voltage thereof.

[0054] The technical scheme provided by the embodiment of the present disclosure is that a threshold setting circuit 2 and a comparator 4 are arranged in the voltage monitoring circuit of the new energy automobile. The voltage dividing circuit 1 and the threshold setting circuit 3 are electrically connected with the comparator 4, and the comparator 4 compares the output voltage of the voltage dividing circuit 1 with the output voltage of the threshold setting circuit 3. When the output voltage of the voltage dividing circuit 1 is greater than the output voltage of the threshold setting circuit 3, the third terminal 43 outputs a high level, and the voltage of the high level is less than or equal to the rated voltage of the DSP chip. When the output voltage of the voltage dividing circuit 1 is less than the output voltage of the threshold setting circuit 3, the third terminal 43 outputs a low level. In this way, the input voltage of the DSP chip 200 can be prevented from exceeding the rated voltage, thereby prolonging the service life of the DSP chip 200. Even if the output voltage value of the first power supply 100 is large, the input voltage of the DSP chip 200 will not exceed the rated voltage.

[0055] In addition, even if the voltage output by the first power supply 100 is a variable value, the voltage output by the first power supply 100 after passing through the voltage dividing circuit 1 and the comparator 4 is a fixed value, thereby making the input voltage of the DSP chip 200 more stable.

[0056] In some examples, the voltage value of the high level output by the comparator 4 is equal to the rated voltage of the DSP chip 200.

[0057] For example, the rated voltage of the DSP chip 200 is 5V, and when the output voltage of the voltage dividing circuit 1 is greater than the output voltage of the threshold setting circuit 3, that is, the output voltage of the voltage dividing circuit 1 is greater than the reference voltage of the comparator 4. At this time, the comparator 4 outputs a high level, and the voltage value of the high level is 5V. In this way, when the comparator 4 outputs a high level, the input voltage of the DSP chip 200 can always be the rated voltage, thereby making the DSP chip maintain the best running state and making the DSP chip 200 more stable.

[0058] Of course, in other examples, the voltage value of the high level output by the comparator 4 can also be less than the rated voltage of the DSP chip 200.

[0059] For example, the rated voltage of the DSP chip 200 is 5V, and when the output voltage of the voltage dividing circuit 1 is greater than the output voltage of the threshold setting circuit 3, that is, the output voltage of the voltage dividing circuit 1 is greater than the reference voltage of the comparator 4. At this time, the comparator 4 outputs a high level, and the voltage value of the high level is 4.5V. In this way, the input voltage of the DSP chip 200 can be prevented from exceeding the rated voltage, thereby prolonging the service life of the DSP chip 200.

[0060] It should be noted that the voltage value of the output voltage of the third terminal 43 of the comparator 4 is not specifically limited in the embodiment of the present disclosure, and the output voltage of the third terminal 43 of the comparator 4 can be set according to the rated voltage of the DSP chip 200.

[0061] In some examples, the voltage value of the second terminal 42 is less than the rated voltage of the DSP chip 200, i.e. the reference voltage of the comparator 4 is less than the rated voltage of the DSP chip 200. The reference voltage of the comparator 4 can be set as the driving voltage of the DSP chip 200, i.e. the output voltage of the threshold setting circuit 3 is set as the driving voltage of the DSP chip 200. When the output voltage of the voltage dividing circuit 1 reaches the driving voltage of the DSP chip 200, the comparator 4 outputs high level.

[0062] For example, the rated voltage of the DSP chip 200 is 5V and the driving voltage is 3V, the output voltage of the threshold setting circuit 3 can be set as 3V. When the output voltage of the voltage dividing circuit 1 is greater than 3V, it indicates that the output voltage of the voltage dividing circuit 1 can drive the DSP chip 200, at this time the comparator 4 outputs high level, thereby driving the DSP chip 200 to send control signals to the automobile. When the output voltage of the voltage dividing circuit 1 is less than 3V, it indicates that the output voltage of the voltage dividing circuit 1 cannot drive the DSP chip 200, at this time the comparator 4 outputs low level, at this time the DSP chip 200 cannot send control signals to the automobile.

[0063] It should be noted that when the output voltage of the voltage dividing circuit 1 is greater than the output voltage of the threshold setting circuit 3, the output voltage of the third terminal 43 of the comparator 4 is a fixed value regardless of the output voltage of the voltage dividing circuit 1.

[0064] If the voltage value of the second terminal 42 is set too high, the DSP chip 200 can only work when the output voltage of the voltage dividing circuit 1 is high. However, the output voltage of the voltage dividing circuit 1 is related to the output voltage of the first power supply 100, if the output voltage of the first power supply 100 is small, it will cause the output voltage of the voltage dividing circuit 1 cannot reach the voltage value of the second terminal 42, thereby cannot drive the DSP chip 200.

[0065] In some examples, the voltage value of the high level output by the comparator 4 is equal to the output voltage of the digital power supply 2.

[0066] In some examples, the output voltage of the digital power supply 2 is equal to the rated voltage of the DSP chip 200. The voltage value of the high level output by the comparator 4 is determined by the digital power supply 2, therefore setting the output voltage of the digital power supply 2 equal to the rated voltage of the DSP chip 200 can make the voltage value of the high level output by the comparator 4 equal to the driving voltage of the DSP chip 200.

[0067] In some examples, as Figure 2As shown, the voltage divider circuit 1 includes a first resistor 11, a second resistor 12, and a capacitor 13. The first resistor 11 and the second resistor 12 are connected in series, and the capacitor 13 is connected in parallel with the second resistor 12. One end of the capacitor 13 is electrically connected to the first terminal 41, and the other end is grounded. The capacitor 13 is used to filter the AC current to prevent the AC current from interfering with the voltage monitoring circuit.

[0068] The voltage at the first terminal 41 is equal to the voltage across the second resistor 12. The output voltage of the voltage divider circuit 1 is related to the resistance values ​​of the first resistor 11 and the second resistor 12. If the voltage of the first power supply 100 is relatively large, while the rated voltage and drive voltage of the DSP chip 200 are relatively small, the resistance value of the first resistor 11 can be set to be greater than the resistance value of the second resistor 12.

[0069] It should be noted that when setting the first resistor 11 and the second resistor 12, it should be ensured that when the voltage of the first power supply 100 is at its minimum value, the output voltage of the voltage divider circuit 1 can reach the driving voltage of the DSP chip 200. For example, if the driving voltage of the DSP chip 200 is 3V and the minimum voltage of the first power supply 100 is 9V, then it should be ensured that the output voltage of the voltage divider circuit 1 is greater than 3V after the 9V voltage passes through it. That is, the voltage across the second resistor 12 should be greater than 3V. This ensures that the first power supply 100 can always drive the DSP chip 200. Calculations show that the resistance ratio of the first resistor 11 and the second resistor 12 should be 2:1. For example, the resistance of the first resistor 11 is 40KΩ and the resistance of the second resistor 12 is 20KΩ.

[0070] In some examples, such as Figure 2 As shown, the threshold setting circuit 3 includes a third resistor 31 and a fourth resistor 32. The digital power supply 2, the third resistor 31, and the fourth resistor 32 are connected in series. One end of the fourth resistor 32 is electrically connected to the second terminal 42, and the other end is grounded. The voltage at the second terminal 42 is equal to the voltage across the fourth resistor 32.

[0071] In some examples, the resistance value of the third resistor 31 is less than the resistance value of the fourth resistor 32.

[0072] Understandably, the resistance values ​​of the third resistor 31 and the fourth resistor 32 can be set according to the driving voltage and rated voltage of the DSP chip 200 and the voltage of the digital power supply 2. If the rated voltage of the DSP chip 200 and the voltage of the digital power supply need to be the same, and the driving voltage of the DSP chip 200 is relatively large, then the resistance value of the fourth resistor 32 should be set to be greater than the resistance value of the third resistor 31.

[0073] For example, the voltage of the digital power supply 2 is 5V, the driving voltage of the DSP chip 200 is 3V, and the voltage of the second end 42 of the comparator 4 is set to 3V. The voltage across the fourth resistor 32 should also be 3V, and the resistance ratio of the fourth resistor 32 to the third resistor 31 should be 3:2 (for example, the fourth resistor 32 is 30KΩ, and the third resistor 31 is 20KΩ).

[0074] If the driving voltage of the DSP chip 200 is smaller, the resistance of the fourth resistor 32 is set to be smaller than the resistance of the third resistor 31.

[0075] For example, the voltage of the digital power supply 2 is 5V, the driving voltage of the DSP chip 200 is 2V, and the voltage of the second end 42 of the comparator 4 is set to 2V. The voltage across the fourth resistor 32 should also be 2V, and the resistance ratio of the fourth resistor 32 to the third resistor 31 should be 2:3 (for example, the fourth resistor 32 is 20KΩ, and the third resistor 31 is 30KΩ).

[0076] In some examples, the first end 41 is a positive input end, and the second end 42 is a negative input end. According to the working principle of the comparator 4, when the voltage of the positive input end is higher than the voltage of the negative input end, the comparator 4 outputs a high level. When the voltage of the positive input end is lower than the voltage of the negative input end, the comparator 4 outputs a low level.

[0077] In some examples, the comparator 4 can include a differential amplifier.

[0078] Next, the working process of the new energy vehicle voltage monitoring circuit is exemplarily described.

[0079] When the first power supply 100 supplies power to the voltage dividing circuit 1, the voltage dividing circuit 1 inputs the voltage to the first end 41 of the comparator 4, so that the voltage of the first end 41 is equal to the voltage across the second resistor 12. At the same time, the digital power supply 2 supplies power to the threshold setting circuit 3, and the threshold setting circuit 3 inputs the voltage to the second end 42 of the comparator 4, so that the voltage of the second end 42 is equal to the voltage across the fourth resistor 32.

[0080] Then, the comparator 4 compares the voltage of the first end 41 with the voltage of the second end 42. If the voltage of the first end 41 is greater than the voltage of the second end 42, the third end 43 of the comparator 4 outputs a high level to the DSP chip 200, and the voltage of the high level is the rated voltage of the DSP chip 200. If the voltage of the first end 41 is less than the voltage of the second end 42, the third end 43 of the comparator 4 outputs a low level to the DSP chip 200, and the voltage of the low level is 0V.

[0081] The embodiment of the present disclosure further provides a vehicle, which comprises the first power supply 100, the DSP chip 200 and the new energy automobile voltage monitoring circuit.

[0082] The first power supply 100 is a small battery in the vehicle, and the voltage value of the first power supply 100 can be 9V-16V. The voltage output by the first power supply 100 is a variable value.

[0083] The DSP chip 200 can control the components such as the light, the electric seat and the windscreen wiper in the vehicle.

[0084] The technical scheme provided by the embodiment of the present disclosure is that the new energy automobile voltage monitoring circuit is arranged in the vehicle. The threshold setting circuit 3 and the comparator 4 are arranged in the new energy automobile voltage monitoring circuit. The voltage output by the first power supply 100 is a variable value.

[0085] In addition, even if the voltage output by the first power supply 100 is a variable value, the voltage output by the first power supply 100 is a fixed value after passing through the voltage dividing circuit 1 and the comparator 4, so that the input voltage of the DSP chip 200 is relatively stable.

[0086] The above description is only optional embodiments of the present disclosure, and is not used to limit the present disclosure. Any modification, equivalent replacement, improvement and the like made within the principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A new energy vehicle voltage monitoring circuit, characterized in that, The new energy vehicle voltage monitoring circuit comprises a voltage dividing circuit (1), a digital power supply (2), a threshold setting circuit (3) and a comparator (4); The input end of the voltage dividing circuit (1) is electrically connected with the first power supply (100), and the output end is electrically connected with the first end (41) of the comparator (4); The input end of the threshold setting circuit (3) is electrically connected with the digital power supply (2), and the output end is electrically connected with the second end (42) of the comparator (4); The third end (43) of the comparator (4) is electrically connected with the digital signal processor (DSP) chip (200), the fourth end (44) is electrically connected with the digital power supply (2), and the fifth end (45) is grounded; The comparator (4) is configured to output a high level at the third end (43) when the output voltage of the voltage dividing circuit (1) is greater than the output voltage of the threshold setting circuit (3), and output a low level at the third end (43) when the output voltage of the voltage dividing circuit (1) is less than the output voltage of the threshold setting circuit (3), wherein the voltage of the high level is less than or equal to the rated voltage of the DSP chip (200). 2.The new energy automobile voltage monitoring circuit according to claim 1, characterized in that, The voltage value of the high level output by the comparator (4) is equal to the rated voltage of the DSP chip (200). 3.The new energy automobile voltage monitoring circuit according to claim 1, characterized in that, The voltage value of the second end (42) is less than the rated voltage of the DSP chip (200).

4. The new energy vehicle voltage monitoring circuit according to claim 1, characterized in that, The voltage value of the high level output by the comparator (4) is equal to the output voltage of the digital power supply (2).

5. The new energy vehicle voltage monitoring circuit according to claim 1, characterized in that, The output voltage of the digital power supply (2) is equal to the rated voltage of the DSP chip (200).

6. The new energy vehicle voltage monitoring circuit according to claim 1, characterized in that, The voltage dividing circuit (1) comprises a first resistor (11), a second resistor (12) and a capacitor (13); The first resistor (11) is connected in series with the second resistor (12), and the capacitor (13) is connected in parallel with the second resistor (12); One end of the capacitor (13) is electrically connected with the first end (41), and the other end is grounded.

7. The new energy vehicle voltage monitoring circuit according to claim 1, characterized in that, The threshold setting circuit (3) comprises a third resistor (31) and a fourth resistor (32); The digital power supply (2), the third resistor (31) and the fourth resistor (32) are connected in series; One end of the fourth resistor (32) is electrically connected with the second end (42), and the other end is grounded. 8.The new energy vehicle voltage monitoring circuit according to claim 7, characterized in that, The resistance value of the third resistor (31) is less than the resistance value of the fourth resistor (32). 9.The new energy vehicle voltage monitoring circuit according to claim 1, characterized in that, The first end (41) is a positive input end, and the second end (42) is a negative input end.

10. A vehicle characterized by comprising: The vehicle comprises a first power supply (100), a DSP chip (200) and a new energy vehicle voltage monitoring circuit according to any one of claims 1-9; The voltage dividing circuit (1) of the new energy vehicle voltage monitoring circuit is electrically connected with the first power supply (100), and the third end (43) of the comparator (4) of the voltage monitoring circuit is electrically connected with the DSP chip (200).

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