High-voltage pre-charging circuit and vehicle

Abstract

The utility model discloses a high-voltage pre-charging circuit and a vehicle. The high-voltage pre-charging circuit comprises a pre-charging resistor; the pre-charging processing unit comprises a control module and a detection module coupled to the control module; wherein the control module comprises a control chip and a switch tube, and is used for controlling the on-off of the switch tube according to the pre-charging quantity value detected by the detection module; the detection module comprises a sampling resistor, at least one resistor connected in series and at least one capacitor connected in parallel; the pre-charging resistor, the control module and the detection module are connected in series. According to the high-voltage pre-charging circuit, the pre-charging processing unit is arranged in the high-voltage pre-charging circuit, and the on-off of the switch tube is determined based on the pre-charging quantity value detected by the detection module, so that the overheat loss of the pre-charging resistor caused by the change of voltage in the pre-charging process can be avoided, and the service life of the pre-charging resistor is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field, concretely is a kind of high voltage pre-charge circuit and vehicle. BACKGROUND

[0002] The pre-charge circuit can control and protect the current during the starting process of the battery system. For the pre-charge circuit, the pre-charge resistor is an important component in the circuit. The pre-charge resistor limits the current to enable the battery system to enter the working state. Since the voltage in the battery system changes, it causes the pre-charge resistor to heat up. Long-term heating affects the service life of the pre-charge resistor, which in turn affects the working reliability of the pre-charge circuit and the BDU (Battery Distribution Unit). SUMMARY

[0003] In view of the above defects of the prior art, the technical problem to be solved by the utility model is to protect the pre-charge resistor in the high-voltage pre-charge circuit and reduce the impact caused by its heat loss.

[0004] To solve at least one of the above technical problems, the utility model discloses a high-voltage pre-charge circuit and vehicle.

[0005] According to one aspect of the present disclosure, a high-voltage pre-charge circuit and vehicle are provided, comprising:

[0006] a pre-charge resistor;

[0007] a pre-charge processing unit, including a control module and a detection module coupled to the control module; wherein the control module includes a control chip and a switch tube, for controlling the on-off of the switch tube according to the pre-charge value detected by the detection module; the detection module includes a sampling resistor, at least one series resistor and at least one parallel capacitor;

[0008] The pre-charge resistor, the control module and the detection module are connected in series.

[0009] The utility model has the following advantages:

[0010] The utility model discloses a high voltage precharge circuit, including high voltage precharge circuit, precharge processing unit and control module, wherein, precharge processing unit is connected in high voltage precharge circuit, and precharge processing unit includes control module and the detection module that is coupled to control module, and control module includes switch tube and control chip, to make switch tube can be switched on or be turned off according to the control of control chip, thereby can control the precharge of high voltage precharge circuit and stop precharge, further, detection module includes sampling resistance, the resistance that is in series with sampling resistance and the capacitor that is parallel with sampling resistance, can determine precharge electric quantity value according to precharge time and precharge current, to make control chip can control the on-off of switch tube according to precharge electric quantity value, thereby avoid the precharge resistance overheating caused by voltage transformation, play the protection effect to precharge resistance, prolong the service life of precharge resistance, and improve the working reliability of high voltage precharge circuit. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme of the utility model, the following will be to or the drawings needed to be used in the prior art description are simply introduced, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0012] Figure 1 The circuit architecture diagram of the high voltage precharge circuit provided by the embodiment of the utility model is provided.

[0013] Figure 2 The circuit architecture diagram of the precharge processing unit provided by the embodiment of the utility model is provided.

[0014] Figure 3 The circuit connection principle diagram of the precharge processing unit provided by the embodiment of the utility model is provided.

[0015] Figure 4 The circuit connection principle diagram of the high voltage precharge circuit provided by the embodiment of the utility model is provided.

[0016] Figure 5 The schematic diagram of the high voltage precharge circuit provided by the embodiment of the utility model is provided. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiment of the present specification will be described clearly and completely in the following by combining the drawings in the embodiment of the present specification, obviously, the described embodiment is only a part of the embodiment of the present specification, not all the embodiments. Based on the embodiment in the present specification, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] It should be noted that the terms "first", "second", and the like in the description and in the claims of the utility model and the above-mentioned 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, for example, a process, method, system, product or server including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0019] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the drawings represent functionally the same or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0020] The word "exemplary" is used herein in the sense of being an example, illustration, or illustration. Any embodiment described herein as "exemplary" is not necessarily construed as being superior to or better than other embodiments.

[0021] The term "and / or" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the term "at least one" herein means any one of the plurality or any combination of at least two of the plurality, for example, including at least one of A, B and C can mean including any one or more elements selected from the set consisting of A, B and C.

[0022] In addition, in order to better illustrate the present disclosure, a large number of specific details are given in the specific embodiments below. Those skilled in the art should understand that without certain specific details, the present disclosure can also be implemented. In some examples, methods, means, elements and circuits well known to those skilled in the art are not described in detail, in order to highlight the main idea of the present disclosure.

[0023] Figure 1 A circuit architecture diagram of a high-voltage pre-charge circuit provided by the utility model embodiment, please refer to Figure 1 A high-voltage pre-charge circuit and a vehicle can include:

[0024] The pre-charge resistor R1 is a ceramic resistor, and the resistance value of the pre-charge resistor R1 ranges from 10Ω to 250Ω.

[0025] The pre-charging processing unit comprises a control module and a detection module coupled to the control module; wherein the control module comprises a control chip U1 and a control switch K1 for controlling the on-off of the switch tube Q1 according to the pre-charging value detected by the detection module; the detection module comprises a sampling resistor R2, at least one series resistor and at least one parallel capacitor.

[0026] The pre-charging resistor R1, the control module and the detection module are connected in series.

[0027] In a specific embodiment, the pre-charging resistor R1 can be a ceramic resistor, which has the characteristics of light weight, so as to reduce the weight of the high-voltage pre-charging circuit, and has the characteristics of high stability and high temperature resistance, so that the high-voltage pre-charging circuit can still work normally under high temperature conditions, reduces the resistance value change caused by time change, thereby ensuring the working stability and reliability of the high-voltage pre-charging circuit. For the pre-charging resistor R1, the size of the pre-charging current value in the high-voltage pre-charging circuit can be limited by adjusting its resistance value, and the resistance value range can be 10Ω-250Ω. The specific resistance value can be adaptively adjusted according to different pre-charging conditions and pre-charging parameters. The greater the resistance value of the pre-charging resistor R1, the shorter the pre-charging time. In the utility model, the resistance value of the pre-charging resistor R1 is preferably 50Ω.

[0028] In a specific embodiment, the pre-charging processing unit can comprise a control module and a detection module coupled to the control module, and the control module comprises a control chip U1 and a switch tube Q1, so that the working state of the high-voltage pre-charging circuit is controlled by controlling the on-off state of the switch tube Q1 by the control module, that is, the pre-charging or stop pre-charging of the high-voltage pre-charging circuit is realized by controlling the conduction or turn-off of the switch tube Q1.

[0029] Figure 2 The circuit architecture diagram of the pre-charging processing unit provided by the utility model embodiment, Figure 3 The circuit connection principle diagram of the pre-charging processing unit provided by the utility model embodiment; please refer to Figures 2-3 :

[0030] For the connection between the control chip U1 and the switch tube Q1, as Figure 2 shown, the control chip U1 has a first end, a second end and a third end;

[0031] The switch tube Q1 comprises at least one triode, has a first end, a second end and a third end, wherein the first end is coupled to the pre-charging resistor R1, and the second end is coupled to the first end of the control chip U1. The switch tube Q1 further comprises a diode connected in parallel with the triode.

[0032] The control chip U1 is used to receive the pre-charge trigger signal transmitted by the outside before the high-voltage pre-charge circuit works, and control the on-off of the switch tube Q1 in response to the pre-charge trigger signal, or receive the pre-charge current value transmitted by the detection module when the high-voltage pre-charge circuit works, and control the on-off of the switch tube Q1 based on the pre-charge current threshold and / or the pre-charge time. Through the control of the switch tube Q1 by the control chip U1, the control of the high-voltage pre-charge circuit is realized, which avoids the overheat of the specific pre-charge resistor R1 caused by the too long pre-charge time or the too large pre-charge current, realizes the protection of the pre-charge resistor R1 and other elements in the circuit, prolongs the service life, and improves the reliability and safety of the pre-charge process.

[0033] Specifically, the control chip U1 has at least three terminals, i.e. a first terminal, a second terminal and a third terminal. The first terminal is coupled to the switch tube Q1 to control the on-off state of the switch tube Q1. The second terminal and the third terminal are respectively coupled to the detection module to receive the pre-charge current value transmitted by the detection module and electrically isolate the detection module from the high-voltage circuit.

[0034] The switch tube Q1 can be composed of a triode or a triode cooperating with a diode. The switch tube Q1 has a first terminal, a second terminal and a third terminal. The first terminal is coupled to the pre-charge resistor R1. The second terminal is coupled to the first terminal of the control chip U1, so that the switch tube Q1 is turned on or turned off in response to the control of the control chip U1, thereby turning on or turning off the current transmission in the high-voltage pre-charge circuit to make the high-voltage pre-charge circuit execute pre-charge or pause pre-charge.

[0035] In addition, the pre-charge processing unit can further include a detection module coupled to the control module. The detection module can include a sampling resistor R2, at least one series resistor and at least one parallel capacitor. The at least one series resistor can be a delay resistor R3, and the at least one parallel capacitor can be a delay capacitor C2.

[0036] For the connection of each element in the detection module, as shown in Figure 2 The sampling resistor R2 has a first terminal and a second terminal.

[0037] The delay capacitor C2 has a first terminal and a second terminal. The first terminal is coupled to the second terminal of the control chip U1, and the second terminal is coupled to the third terminal of the control chip U1.

[0038] The delay resistor R3 has a first terminal and a second terminal. The first terminal is coupled to the second terminal of the control chip U1, and the second terminal is coupled to the first terminal of the sampling resistor R2.

[0039] The first end of the sampling resistor R2 is coupled to the third end of the switch tube Q1, and the second end of the sampling resistor R2 is coupled to the third end of the control chip U1; the resistance value of the sampling resistor R2 ranges from 100mΩ to 500mΩ, and the resistance value of the sampling resistor R2 is preferably 100mΩ.

[0040] Specifically, the sampling resistor R2 can be used to determine the pre-charge current value in the high-voltage pre-charge circuit; the delay resistor R3 can be used to determine the length of the delay time, and the delay resistor R3 can be used to control the pre-charge speed of the to-be-pre-charged capacitor C1; when the switch tube Q1 is closed, the delay resistor R3 starts to work, and the resistance value of the delay resistor R3 can range from kΩ to several kΩ, and the resistance value of the delay resistor R3 can determine the length of the delay time.

[0041] The capacitance value of the delay capacitor C2 can range from μF to several μF, and the delay resistor R3 is used to cooperate with the delay capacitor C2 to control the pre-charge time of the pre-charge process, and then the pre-charge current value and the pre-charge time can be used to determine whether the switch tube Q1 needs to be turned off; for example, when the pre-charge current value reaches 20A and / or the pre-charge time reaches 20ms, it can be considered that the switch tube Q1 needs to be turned off.

[0042] In the detection module, the sampling resistor R2 is used to determine the pre-charge current value of the pre-charge process, the delay capacitor C2 and the delay resistor R3 are used to cooperate with each other to control the pre-charge time of the pre-charge process, the product of the pre-charge current value and the pre-charge time can be used to determine the pre-charge capacity value in the pre-charge process, and then when the pre-charge capacity value is greater than the preset capacity value corresponding to the to-be-pre-charged capacitor C1, or the pre-charge current value is greater than the preset capacity value, or the pre-charge time is greater than the preset time, the control module can be used to control the switch tube Q1 to be turned off, and then the pre-charge process of the high-voltage pre-charge circuit can be stopped, so that the overheating and other losses of various elements caused by the excessively large current value or the excessively long pre-charge time can be avoided, the various elements can be protected, and the service life of the various elements can be prolonged.

[0043] Figure 4 A circuit connection principle diagram of the high-voltage pre-charge circuit is provided for the embodiments of the utility model; Figure 5 A schematic diagram of the high-voltage pre-charge circuit is provided for the embodiments of the utility model, please refer to Figures 4-5 :

[0044] The high-voltage pre-charge circuit further comprises an anti-reverse device, and the anti-reverse device can be an anti-reverse diode D1.

[0045] The anti-reverse device has a first end and a second end, wherein the first end is coupled to the positive end of the high-voltage power supply BT2, and the second end is coupled to the first end of the pre-charge resistor R1.

[0046] In one specific embodiment, the first end of the anti-reverse diode D1 is coupled to the positive end of the high-voltage power supply BT2, and the second end is coupled to the first end of the pre-charge resistor R1. Due to the working principle based on the characteristics of the semiconductor PN junction, the anti-reverse diode D1 can be used to prevent the current in the high-voltage pre-charge circuit from flowing in the reverse direction. Thus, the other elements in the high-voltage pre-charge circuit are protected from damage caused by reverse current.

[0047] By setting the anti-reverse diode D1 in the high-voltage pre-charge circuit, the current passing through the high-voltage pre-charge circuit is unidirectional, avoiding the reverse flow of current in the high-voltage pre-charge circuit, which causes the wear of each element in the high-voltage pre-charge circuit. Thus, the service life of each element is prolonged, and the reliability of the high-voltage pre-charge circuit is ensured.

[0048] In addition, as shown in Figure 1 or Figures 4-5 The high-voltage pre-charge circuit further comprises:

[0049] The high-voltage power supply BT2 has a positive end and a negative end;

[0050] The to-be-pre-charged capacitor C1 has a first end and a second end, wherein the first end is coupled to the pre-charge processing unit, and the second end is coupled to the negative end of the high-voltage power supply BT2; the capacitance value of the to-be-pre-charged capacitor C1 ranges from 10 μF to 1000 μF.

[0051] In one specific embodiment, the high-voltage power supply BT2 includes a positive end and a negative end, the positive end is coupled to the pre-charge resistor R1, and the anti-reverse diode D1 can be arranged on the connection path between the two. The high-voltage power supply BT2 is used to provide the required high voltage for the high-voltage pre-charge circuit, which serves as the energy source in the high-voltage pre-charge circuit and can provide the required power for the high-voltage pre-charge circuit and other electronic elements. The voltage value of the high-voltage power supply BT2 can range from 400v to 800v, and preferably the voltage value of the high-voltage power supply BT2 can be 800v.

[0052] The to-be-pre-charged capacitor C1 includes a first end and a second end, the first end is coupled to the pre-charge processing unit to realize and control the pre-charging of the to-be-pre-charged capacitor C1, and the second end is coupled to the negative end of the high-voltage power supply BT2. The to-be-pre-charged capacitor C1 can correspond to the capacitance value of the whole vehicle, and the parameter range can be 10 μF to 1000 μF.

[0053] For a high-voltage pre-charge circuit, a high-voltage power supply BT2, a pre-charge resistor R1, a capacitor C1 to be pre-charged, an anti-reverse diode D1 coupled between the pre-charge resistor R1 and the high-voltage power supply BT2, and a pre-charge processing unit for controlling the pre-charge process can be included; the pre-charge processing unit can include a detection module and a control module, the control module including a switch tube Q1 and a control chip U1, and the control of the switch tube Q1 by the control chip U1 can control the pre-charge process; the detection module includes a sampling resistor R2, a delay resistor R3 and a delay capacitor C2, the pre-charge time is determined by the delay capacitor C2 and the delay resistor R3, and the pre-charge current value in the high-voltage pre-charge circuit can be determined by the sampling resistor R2, so that the pre-charge processing unit can determine whether the switch tube Q1 needs to be turned off according to the pre-charge time and the pre-charge current value, thereby avoiding overheating of the pre-charge resistor R1 and protecting the pre-charge resistor R1.

[0054] In addition, the utility model also provides a vehicle, including high-voltage pre-charge circuit as described above, or including the battery distribution unit for high-voltage pre-charge circuit as described above.

[0055] According to the above embodiment of the utility model, in the high-voltage pre-charge circuit, the pre-charge processing unit is connected, the pre-charge processing unit includes the control module and the detection module coupled to the control module, the control module includes the switch tube and the control chip, so that the switch tube can be turned on or turned off according to the control of the control chip, thereby the pre-charge and the stop pre-charge of the high-voltage pre-charge circuit can be controlled;Further, the detection module includes the sampling resistor, the resistor in series with the sampling resistor and the capacitor in parallel with the sampling resistor, the pre-charge current value can be determined according to the pre-charge time and the pre-charge current, so that the control chip can control the on-off of the switch tube according to the pre-charge current value, thereby avoiding the overheating of the pre-charge resistor caused by voltage conversion, protecting the pre-charge resistor, prolonging the service life of the pre-charge resistor and improving the working reliability of the high-voltage pre-charge circuit.

[0056] It should be noted that: the above has described various embodiments of the present disclosure, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles, practical applications or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A high voltage pre-charge circuit, characterized by, The high-voltage pre-charge circuit comprises: a pre-charge resistor; a pre-charge processing unit comprising a control module and a detection module coupled to the control module; wherein the control module comprises a control chip and a switch tube, and is configured to control the on-off of the switch tube according to a pre-charge value detected by the detection module; the detection module comprises a sampling resistor, at least one series resistor and at least one parallel capacitor; the pre-charge resistor, the control module and the detection module are connected in series.

2. A high voltage pre-charge circuit as claimed in claim 1, characterized in that, In the control module, the control chip has a first end, a second end and a third end; the switch tube comprises at least one triode and has a first end, a second end and a third end, wherein the first end is coupled to the pre-charge resistor, and the second end is coupled to the first end of the control chip.

3. A high voltage pre-charge circuit as claimed in claim 2, characterized in that The switch tube further comprises a diode connected in parallel with the triode.

4. A high voltage pre-charge circuit as claimed in claim 2, wherein, The sampling resistor has a first end and a second end, and the detection module further comprises: a delay capacitor having a first end and a second end, wherein the first end is coupled to the second end of the control chip, and the second end is coupled to the third end of the control chip; a delay resistor having a first end and a second end, wherein the first end is coupled to the second end of the control chip, and the second end is coupled to the first end of the sampling resistor; the first end of the sampling resistor is coupled to the third end of the switch tube, and the second end of the sampling resistor is coupled to the third end of the control chip.

5. A high voltage pre-charge circuit as claimed in claim 1, wherein, The high-voltage pre-charge circuit further comprises: a high-voltage power supply having a positive end and a negative end; a capacitor to be pre-charged having a first end and a second end, wherein the first end is coupled to the pre-charge processing unit, and the second end is coupled to the negative end of the high-voltage power supply.

6. A high voltage pre-charge circuit as claimed in claim 1, wherein, The pre-charge resistor is a ceramic resistor, and the resistance value of the pre-charge resistor ranges from 10Ω to 250Ω.

7. A high voltage pre-charge circuit as claimed in claim 5, wherein, The high-voltage pre-charge circuit further comprises an anti-reverse diode; the anti-reverse diode has a first end and a second end, wherein the first end is coupled to the positive end of the high-voltage power supply, and the second end is coupled to the first end of the pre-charge resistor.

8. The high voltage pre-charge circuit of claim 1, wherein, The resistance value of the sampling resistor ranges from 100mΩ to 500mΩ.

9. A high voltage pre-charge circuit as claimed in claim 5, wherein, The capacitance value of the capacitor to be pre-charged ranges from 10μF to 1000μF.

10. A vehicle comprising the high-voltage pre-charge circuit according to any one of claims 1-9.

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