Pre-driving chip, vehicle-mounted pre-driving system and vehicle

Abstract

The utility model discloses a pre-drive chip, a vehicle-mounted pre-drive system and a vehicle. The pre-drive chip comprises a charge pump circuit, and the charge pump circuit comprises a booster circuit which is connected with a power supply voltage and boosts the power supply voltage to obtain a first drive voltage; the first switching circuit is electrically connected with the booster circuit and is used for selectively outputting the first driving voltage; the comparison circuit is electrically connected with the first switching circuit; the voltage stabilizing capacitor is electrically connected with the first switching circuit; and the output terminal is electrically connected with the first switching circuit, the comparison circuit and the voltage stabilizing capacitor, and the comparison circuit compares the actual driving voltage of the output port with a reference voltage and controls the first switching circuit to be switched on and off based on a comparison result. In this way, high driving voltage can be achieved, and the stability of the driving voltage and the integration degree of the circuit are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a pre-drive chip, a vehicle-mounted pre-drive system and a vehicle. BACKGROUND

[0002] With the development of intelligent vehicles, the load on the vehicle is increasing, and the power is also increasing. Based on the increase of power consumption load and the demand for cost reduction and lightweight of power transmission wires, 48V systems are introduced into vehicle electronic and electrical systems. However, the current passenger car electronic and electrical systems are designed based on 12V, and there is no high-integration electronic and electrical system suitable for 48V load, especially for the pre-drive control system of the vehicle body large load. Therefore, it is an urgent technical problem to design a 48V pre-drive system. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a pre-drive chip, a vehicle-mounted pre-drive system and a vehicle to realize high driving voltage and improve the stability of the driving voltage and the integration of the circuit.

[0004] The present application provides a pre-drive chip. The pre-drive chip includes a charge pump circuit, which includes: a boost circuit connected to a power supply voltage and boosting the power supply voltage to obtain a first driving voltage; a first switch circuit electrically connected to the boost circuit for selectively outputting the first driving voltage; a comparison circuit electrically connected to the first switch circuit; a voltage stabilizing capacitor; and an output terminal electrically connected to the first switch circuit, the comparison circuit and the voltage stabilizing capacitor. The comparison circuit compares the actual driving voltage of the output terminal with a reference voltage and controls the first switch circuit based on the comparison result.

[0005] The present application provides a vehicle-mounted pre-drive system, which includes the above-mentioned pre-drive chip; and a peripheral switch circuit electrically connected to the first switch circuit and connected to the power supply voltage.

[0006] The present application provides a vehicle, which includes the above-mentioned vehicle-mounted pre-drive system.

[0007] The pre-driver chip provided by the application is provided with a charge pump circuit, a boosting circuit in the charge pump circuit can perform boosting processing on the power supply voltage to obtain a higher first driving voltage, a comparison circuit in the charge pump circuit compares the actual driving voltage of the output terminal with a reference voltage, controls the first switch circuit to be on or off based on the comparison result, and stabilizes the actual driving voltage through a voltage stabilizing capacitor, so that the actual driving voltage output by the output terminal can be maintained around the reference voltage. Therefore, the application can not only realize the pre-driving function of high driving voltage and large load, but also improve the stability of the actual driving voltage of the pre-driver chip, and the above circuits are all integrated in the pre-driver chip, so that the circuit integration can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0009] Figure 1 is a structural schematic diagram of an embodiment of the vehicle-mounted pre-driving system of the application;

[0010] Figure 2 is a specific circuit structure schematic diagram of the embodiment; Figure 1

[0011] Figure 3 is a circuit structure schematic diagram of the pre-driver chip of the application and the electrical signal running in the first state;

[0012] Figure 4 is a circuit structure schematic diagram of the pre-driver chip of the application and the electrical signal running in the second state;

[0013] Figure 5 is a circuit structure schematic diagram of the pre-driver chip of the application and the electrical signal running in the third state;

[0014] Figure 6 is a circuit structure schematic diagram of the pre-driver chip of the application and the electrical signal running in the fourth state;

[0015] Figure 7 is a voltage waveform schematic diagram corresponding to the embodiment and the Figure 3 embodiment; Figure 4

[0016] Figure 8 is a voltage waveform schematic diagram corresponding to the embodiment and the Figure 5 embodiment; Figure 6 DETAILED DESCRIPTION​​​

[0017] The application will be described in further detail below with reference to the drawings and embodiments. It is to be particularly pointed out that the following embodiments are only used to illustrate the application, but do not limit the scope of the application. Similarly, the following embodiments are only part of the embodiments of the application, but not all the embodiments of the application. All other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0018] In the description of the embodiments of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0019] In the embodiments of the application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0020] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0021] The application first proposes a pre-driving chip, such as Figure 1 and Figure 2As shown, the pre-driver chip 1 of the embodiment includes a charge pump circuit 10, which includes: a boost circuit 11, a comparison circuit 12, a first switch circuit 13, a voltage stabilizing capacitor C3, and an output terminal D; the boost circuit 11 is connected to a power supply voltage PVDD and boosts the power supply voltage PVDD to obtain a first driving voltage; the first switch circuit 13 is electrically connected to the boost circuit 11 and is used to selectively output the first driving voltage; the comparison circuit 12 is electrically connected to the first switch circuit 13; the output terminal D is electrically connected to the first switch circuit 13, the comparison circuit 12, and the voltage stabilizing capacitor C3, respectively; the comparison circuit 12 compares an actual driving voltage VCP of the output terminal D with a reference voltage VCP_REF and controls the first switch circuit 13 to be on or off based on the comparison result.

[0022] The pre-driver chip 1 of the embodiment is provided with the charge pump circuit 10, the boost circuit 11 in the charge pump circuit 10 can boost the power supply voltage PVDD to obtain a higher first driving voltage, and the comparison circuit 12 in the charge pump circuit 10 compares the actual driving voltage VCP of the output terminal D with the reference voltage VCP_REF and controls the first switch circuit 13 to be on or off based on the comparison result, so as to stabilize the actual driving voltage VCP by the voltage stabilizing capacitor C, and maintain the actual driving voltage VCP output by the output terminal D around the reference voltage VCP_REF. Therefore, the embodiment not only can realize the pre-driving function of high driving voltage and large load, but also can improve the stability of the actual driving voltage of the pre-driver chip 1, and the above circuits are all integrated in the pre-driver chip 1, so as to improve the circuit integration.

[0023] The output terminal C can be only a connection place or a section of wire after the connection place, and is not necessarily a physical terminal additionally provided on the wire.

[0024] In some embodiments, as Figure 2 As shown, when the actual driving voltage VCP output by the output terminal D is higher than the reference voltage VCP_REF, the comparison circuit 12 outputs a first level signal to control the first switch circuit 13 to be off, at this time, the first driving voltage provided by the boost circuit 11 is too high, the power supply of the boost circuit 11 is stopped, and the voltage stabilizing capacitor C3 is discharged to the output terminal D to improve the problem of the actual driving voltage VCP being too high; when the actual driving voltage VCP output by the output terminal D is lower than the reference voltage VCP_REF, the comparison circuit 12 outputs a second level signal to control the first switch circuit 13 to be closed, at this time, the boost circuit 11 supplies power to the output terminal D through the first switch circuit 13, and charges the voltage stabilizing capacitor C3.

[0025] In other embodiments, when the actual driving voltage VCP output by the output terminal D is lower than the reference voltage VCP REF, the comparison circuit 12 outputs a third level signal to control the first switch circuit 13 to be off, at this time, the first driving voltage provided by the boost circuit 11 is low, the boost circuit 11 stops supplying power, and the voltage stabilizing capacitor C3 discharges the output terminal D to improve the problem of the actual driving voltage VCP being low; when the actual driving voltage VCP output by the output terminal D is higher than the reference voltage VCP REF, the comparison circuit 12 outputs a fourth level signal to control the first switch circuit 13 to be closed, at this time, the boost circuit 11 supplies power to the output terminal D through the first switch circuit 13, and charges the voltage stabilizing capacitor C3.

[0026] The above two embodiments can be adjusted according to the working characteristics of the first switch circuit 13 and the electrical connection mechanism of the comparison circuit 12 to achieve the technical effects of the present application.

[0027] In some embodiments, the pre-drive chip 1 further comprises a power port 20 and an output port 30, the power port 20 is electrically connected with the boost circuit 11 for accessing the power voltage PVDD, and the power port 20 is further configured to be electrically connected with the peripheral switch circuit 2 of the pre-drive chip 1 to access the power voltage PVDD with the peripheral switch circuit 2; the output port 30 is electrically connected with the output terminal C; the output port 30 is configured to be electrically connected with the peripheral switch circuit 2 to drive the peripheral switch circuit 2 by the actual driving voltage VCP.

[0028] In this embodiment, the charge pump circuit 10, i.e., the boost circuit 11, the comparison circuit 12, the first switch circuit 13, the output terminal C, and the voltage stabilizing capacitor C are integrated in the pre-drive chip 1, and the power voltage PVDD is accessed through the power port 20. The power voltage PVDD is processed by the charge pump circuit 10 to obtain the actual driving voltage VCP maintained around the reference voltage VCP REF, and the actual driving voltage VCP is output through the output port 30 to provide a stable high driving voltage externally to realize large load driving.

[0029] In this embodiment, the boost circuit 11 and the peripheral switch circuit 2 of the pre-drive chip 1 access the power voltage PVDD, and the actual driving voltage VCP obtained by processing the power voltage PVDD by the boost circuit 11 of the pre-drive chip 1 can fluctuate with the fluctuation of the power voltage PVDD, and the actual driving voltage VCP is output to the peripheral switch circuit 2, so that the actual driving voltage VCP accessed by the peripheral switch circuit 2 and the power voltage PVDD have synchronous fluctuation, thereby improving the problem that the peripheral switch circuit 2 cannot work normally due to the fluctuation of the power voltage PVDD, and thus the reliability of the vehicle-mounted pre-drive system can be improved.

[0030] In some embodiments, the boost circuit 11 comprises: a first switch tube M1, a second switch tube M2, a first capacitor C1, a third switch tube M3, a fourth switch tube M4, a second capacitor C2, a fifth switch tube M5, and a sixth switch tube M6; wherein one communication end of the first switch tube M1 is used to access the power supply voltage PVDD; one communication end of the second switch tube M2 is electrically connected with the other communication end of the first switch tube M1, and the other communication end of the second switch tube M2 is electrically connected with the comparison circuit 12 and the boost circuit 11 as the output end of the boost circuit 11, and outputs the first driving voltage; one end of the first capacitor C1 is electrically connected with the other communication end of the first switch tube M1 and one communication end of the second switch tube M2, respectively; one communication end of the third switch tube M3 is used to access the power supply voltage PVDD, and the other communication end of the third switch tube M3 is electrically connected with the other end of the first capacitor C1; one communication end of the fourth switch tube M4 is electrically connected with the other end of the first capacitor C1 and the other communication end of the third switch tube M3, respectively, and the other communication end of the fourth switch tube M4 is grounded; one end of the second capacitor C2 is electrically connected with the other communication end of the second switch tube M1; one communication end of the fifth switch tube M5 is used to access the power supply voltage PVDD, and the other communication end of the fifth switch tube M5 is electrically connected with the other end of the second capacitor C2; one communication end of the sixth switch tube M6 is electrically connected with the other end of the second capacitor C2 and the other communication end of the fifth switch tube M5, respectively, and the other communication end of the sixth switch tube M6 is grounded.

[0031] The one communication end of the first switch tube M1, the one communication end of the third switch tube M3, and the one communication end of the fifth switch tube M5 are all electrically connected with the power supply port 20 to access the power supply voltage PVDD; and the number of ports of the pre-driving chip 1 can be reduced, the cost and structural complexity of the pre-driving chip 1 can be reduced, and the connection convenience of the pre-driving chip 1 and the power supply mechanism can be improved.

[0032] In some embodiments, the pre-driving chip 1 can further be provided with a control port (not shown in the figure), and the control ends of the first switch tube M1, the second switch tube M2, the third switch tube M3, the fourth switch tube M4, the fifth switch tube M5, and the sixth switch tube M6 are electrically connected with the control port to obtain control signals from an external device, such as a vehicle-mounted controller, to realize the on-off of each switch.

[0033] In some embodiments, the pre-driving chip 1 can further be provided with a control port (not shown in the figure), and the pre-driving chip 1 can also be provided with a slave controller (not shown in the figure), which is electrically connected with the control port to obtain control signals from an external device, such as a vehicle-mounted controller; and the slave controller is also electrically connected with the control ends of the first switch tube M1, the second switch tube M2, the third switch tube M3, the fourth switch tube M4, the fifth switch tube M5, and the sixth switch tube M6 to transmit corresponding control signals to each switch tube to realize the on-off of each switch.

[0034] In other circuits, other circuit structures can be used instead of the above-mentioned boost circuit 11, such as the related circuits of charge pumps in the prior art.

[0035] In some embodiments, the comparison circuit 12 includes a comparator, a first input terminal of the comparator is electrically connected to the output terminal D, a second input terminal of the comparator is connected to the reference voltage VCP_REF, an output terminal of the comparator is electrically connected to the first switch circuit 13, and the actual driving voltage VCP output by the output terminal D is compared with the reference voltage VCP_REF, and a control signal VCOMP is output to the first switch circuit 13 based on the comparison result of the actual driving voltage VCP and the reference voltage VCP_REF to control the first switch circuit 13 to be on or off.

[0036] In this embodiment, the comparison circuit 12 is implemented by a comparator, the circuit structure is simple, the cost is low, the control logic is simple and accurate, the cost of the pre-driver chip 1 can be reduced, and the reliability of the pre-driver chip 1 can be improved.

[0037] The size of the reference voltage VCP_REF can be designed based on actual requirements, such as the required driving voltage of the load and the like.

[0038] In some embodiments, the first switch circuit 13 includes a seventh switch tube M7, a control terminal of the seventh switch tube M7 is electrically connected to the comparison circuit 12, one communication terminal of the seventh switch tube M7 is electrically connected to the boost circuit 11, and the other communication terminal of the seventh switch tube M7 is electrically connected to the output terminal D and the voltage stabilizing capacitor C.

[0039] In this embodiment, the first switch circuit 13 is implemented by the seventh switch tube M7, the on-off function of the first driving voltage can be realized, and the structural difficulty, cost and control of the first switch circuit 13 can be reduced, and the control reliability is high.

[0040] In some embodiments, as shown in Figures 2 to 6 , the first switch tube M1, the second switch tube M2, the third switch tube M3, the fifth switch tube M5 and the seventh switch tube M7 are NMOS tubes, the fourth switch tube M4 and the sixth switch tube M6 are PMOS tubes, and the circuit connection structures of the switch tubes are shown in Figures 2 to 6 . The first input terminal of the comparator, i.e. the negative input terminal, is electrically connected to the connection point between the seventh switch tube M7, the voltage stabilizing capacitor C and the output terminal D, the second input terminal of the comparator, i.e. the positive input terminal, is connected to the reference voltage VCP_REF, and the output terminal of the comparator is electrically connected to the control terminal of the seventh switch tube M7.

[0041] Of course, in other embodiments, other switch tubes can be used instead of the above-mentioned MOS tubes, and the types and circuit connection structures of the above-mentioned switch tubes can be adjusted, as long as the corresponding functions of the above-mentioned circuits can be realized.

[0042] In some embodiments, such as Figure 3 As shown, in the first state of the pre-driver chip 1, the first switch M1 is turned off, the second switch M2 is turned on, the third switch M3 is turned on, the fourth switch M4 is turned off, the fifth switch M5 is turned off, and the sixth switch M6 is turned on. The voltages corresponding to detection points CP1L, CP1H, CP2L, and CP2H are as follows: Figure 7 As shown, where, Figure 7 In the spectrum, band PHASE1 corresponds to the first state, and the voltage at detection point CP2H is twice the power supply voltage PVDD. For example... Figure 4 As shown, in the second state of the pre-driver chip 1, the first switch M1 is closed, the second switch M2 is turned off, the third switch M3 is turned off, the fourth switch M4 is closed, the fifth switch M5 is closed, and the sixth switch M6 is turned off. The voltages corresponding to the detection points CP1L, CP1H, CP2L, and CP2H are as follows: Figure 7 As shown, where, Figure 7 In the second state, band PHASE2 corresponds to the detection point CP2H, where the voltage is three times the power supply voltage PVDD. When the actual drive voltage VCP is lower than the reference voltage VCP_REF, the pre-drive chip 1 operates in the second state. The comparator outputs a high level to the seventh switch M7, controlling it to close and output the first drive voltage. This causes the output terminal D to output the actual drive signal VCP and charge the voltage regulator capacitor C3. When the actual drive voltage VCP is higher than the reference voltage VCP_REF, the pre-drive chip 1 operates in the first state. The comparator outputs a low level or no signal to the seventh switch M7, controlling it to turn off and discharge the voltage regulator capacitor C3 to the output terminal D.

[0043] In some embodiments, such as Figure 5 As shown, in the third state of the pre-driver chip 1, the first switch M1 is closed, the second switch M2 is closed, the third switch M3 is turned off, the fourth switch M4 is turned off, the fifth switch M5 is turned off, and the sixth switch M6 is closed. The voltages corresponding to the detection points CP1L, CP1H, CP2L, and CP2H are as follows: Figure 8 As shown, where, Figure 8 In the spectrum, band PHASE1 corresponds to the third state, and the voltage at detection point CP2H is the power supply voltage PVDD. For example... Figure 6 As shown, in the fourth state of the pre-driver chip 1, the first switch M1 is turned off, the second switch M2 is turned off, the third switch M3 is turned off, the fourth switch M4 is turned off, the fifth switch M5 is closed, and the sixth switch M6 is turned off. The voltages corresponding to detection points CP1L, CP1H, CP2L, and CP2H are as follows: Figure 8 As shown, where, Figure 8The wave band PHASE2 in the table corresponds to the fourth state, and the voltage of the detection point CP2H is 2 times of the power supply voltage PVDD. When the actual driving voltage VCP is lower than the reference voltage VCP_REF, the pre-driver chip 1 is controlled to work in the fourth state, the comparator outputs a high level to the seventh switch tube M7 to control the seventh switch tube M7 to be closed to output the first driving voltage, so that the output terminal D outputs the actual driving signal VCP and charges the voltage stabilizing capacitor C3. When the actual driving voltage VCP is higher than the reference voltage VCP_REF, the pre-driver chip 1 is controlled to work in the third state, the comparator outputs a low level or no signal to the seventh switch tube M7 to control the seventh switch tube M7 to be turned off to discharge the output terminal D through the voltage stabilizing capacitor C3.

[0044] In some embodiments, the voltage stabilizing capacitor C3 is electrically connected with the output terminal D and the first switch circuit 13, and the other end is electrically connected with the power supply port 20 to access the power supply voltage PVDD. In this way, the charging time of the voltage stabilizing capacitor C3 can be shortened or its capacity can be reduced.

[0045] In some embodiments, the pre-driver chip 1 further comprises a second switch circuit 131 electrically connected between the output terminal D and the output port 30 for controlling the on-off of the electrical path between the output terminal D and the output port 30.

[0046] The control end of the switch circuit 131 can be electrically connected with the vehicle-mounted controller or the slave controller to control whether the pre-driver chip 1 outputs the actual driving voltage VCP, so as to improve the safety and control flexibility of the pre-drive system and save energy consumption.

[0047] In some embodiments, as shown in Figure 2 The peripheral switch circuit 2 can be a half-bridge driving circuit, comprising a switch tube M12 arranged in the upper bridge arm and a switch tube M13 arranged in the lower bridge arm; the second switch circuit 131 comprises two sub-switch circuits 131 arranged one by one with the switch tube M12 and the switch tube M13 respectively; one end of one sub-switch circuit 131 accesses the actual driving voltage VCP, and the other end is connected with the control end of the switch tube M12; one end of the other sub-switch circuit 131 accesses the actual driving voltage VCP, and the other end is connected with the control end of the switch tube M13; one communication end of the switch tube M12 accesses the power supply voltage PVDD, the other communication end is connected with one communication end of the switch tube M13, the other communication end of the switch tube M13 is grounded, and the connection point between the switch tube M12 and the switch tube M13 can be used as a signal output end of the entire vehicle-mounted pre-drive system.

[0048] In some embodiments, the switch tube M12 and the switch tube M13 are both NMOS tubes, the sub-switch circuit 131 is composed of two PMOS tubes arranged in series, the switch tube M12 and the switch tube M13 are arranged in series, the drain of the switch tube M12 is connected to the power supply voltage PVDD, and the source of the switch tube M13 is grounded; in the sub-switch circuit 131 corresponding to the switch tube M12, the drain of one PMOS tube is connected to the actual driving voltage VCP, the source of the PMOS tube is connected to the gate of the switch tube M12, and the source of the other PMOS tube is connected to the source of the switch tube M12; in the sub-switch circuit 131 corresponding to the switch tube M13, the drain of one PMOS tube is connected to the actual driving voltage VCP, the source of the PMOS tube is connected to the gate of the switch tube M13, and the source of the other PMOS tube is connected to the source of the switch tube M13. The gate of the PMOS tube can be electrically connected to the vehicle-mounted controller or the slave controller.

[0049] In other embodiments, the structure of the peripheral switch circuit 2 described above can be adjusted, for example, a full-bridge structure can be used, and the structure of the switch circuit 131 or the number of the switch circuit 131 can be adjusted accordingly.

[0050] In some embodiments, the power supply voltage is 48V, and the reference voltage VCP_REF can be about 11V higher than the power supply voltage.

[0051] The application further provides a vehicle-mounted pre-drive system, which comprises the pre-drive chip 1 and the peripheral switch circuit 2 of the above-described embodiments, the peripheral switch circuit 2 is connected to the output port 30 of the pre-drive chip 1 to be electrically connected to the output terminal D in the pre-drive chip 1, and both are connected to the power supply voltage PVDD.

[0052] The pre-drive chip 1 and the peripheral switch circuit 2 of the embodiment are both connected to the power supply voltage PVDD, and the driving voltage VCP obtained by processing the power supply voltage PVDD by the pre-drive chip 1 can fluctuate with the power supply voltage PVDD, and the driving voltage VCP is output to the peripheral switch circuit 2, so that the actual driving voltage VCP connected to the peripheral switch circuit 2 and the power supply voltage PVDD have synchronous fluctuations, thereby improving the problem that the peripheral switch circuit 2 cannot work normally due to fluctuations in the power supply voltage PVDD, and thus the reliability of the vehicle-mounted pre-drive system can be improved.

[0053] The vehicle-mounted pre-drive system of the embodiment is a pre-drive system for driving a vehicle-mounted 48V load. It supports direct power supply of the vehicle-mounted 48V system (the load can reach 75V voltage), can improve the integration level and reduce the cost, and supports a wide voltage range without the need for an additional boost constant voltage circuit.

[0054] The power supply voltage PVDD can be obtained from a vehicle-mounted battery or a battery management system.

[0055] The application further provides a vehicle comprising the vehicle pre-driving system.

[0056] The above merely illustrates the embodiments of the application, and is not intended to limit the patent scope of the application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, which is based on the content of the specification and drawings of the application, is also included in the patent protection scope of the application.

Claims

1. A pre-driver chip, characterized by, The pre-driver chip comprises a charge pump circuit, and the charge pump circuit comprises: a boost circuit connected to a power supply voltage and boosting the power supply voltage to obtain a first driving voltage; a first switch circuit electrically connected to the boost circuit and used for selectively outputting the first driving voltage; a comparison circuit electrically connected to the first switch circuit; a voltage stabilizing capacitor; an output terminal electrically connected to the first switch circuit, the comparison circuit and the voltage stabilizing capacitor, the comparison circuit comparing an actual driving voltage of the output terminal with a reference voltage and controlling the first switch circuit to be on or off based on a comparison result.

2. The pre-driver chip of claim 1, wherein, The pre-driver chip further comprises a power supply port and an output port, the power supply port is electrically connected to the boost circuit and used for connecting to the power supply voltage, and the power supply port is further configured to be electrically connected to a peripheral switch circuit of the pre-driver chip to connect to the power supply voltage with the peripheral switch circuit; the output port is electrically connected to the output terminal; the output port is configured to be electrically connected to the peripheral switch circuit to drive the peripheral switch circuit by the actual driving voltage.

3. The pre-driver chip of claim 1, wherein, The boost circuit comprises: a first switch tube, one communication end of the first switch tube is used for connecting to the power supply voltage; a second switch tube, one communication end of the second switch tube is electrically connected to the other communication end of the first switch tube, and the other communication end of the second switch tube is used as an output end of the boost circuit to output the first driving voltage; a first capacitor, one end of the first capacitor is electrically connected to the other communication end of the first switch tube and one communication end of the second switch tube respectively; a third switch tube, one communication end of the third switch tube is used for connecting to the power supply voltage, and the other communication end of the third switch tube is electrically connected to the other end of the first capacitor; a fourth switch tube, one communication end of the fourth switch tube is electrically connected to the other end of the first capacitor and the other communication end of the third switch tube respectively, and the other communication end of the fourth switch tube is grounded; a second capacitor, one end of the second capacitor is electrically connected to the other communication end of the second switch tube; a fifth switch tube, one communication end of the fifth switch tube is used for connecting to the power supply voltage, and the other communication end of the fifth switch tube is electrically connected to the other end of the second capacitor; a sixth switch tube, one communication end of the sixth switch tube is electrically connected to the other end of the second capacitor and the other communication end of the fifth switch tube respectively, and the other communication end of the sixth switch tube is grounded.

4. The pre-driver chip of claim 1, wherein, The comparison circuit comprises: a comparator, a first input end of the comparator is electrically connected to the output terminal, a second input end of the comparator is connected to the reference voltage, an output end of the comparator is electrically connected to the first switch circuit, and the comparator compares the actual driving voltage of the output terminal with the reference voltage and controls the first switch circuit to be on or off based on a comparison result.

5. The pre-driver chip of claim 1, wherein, The first switch circuit comprises: a seventh switch tube, a control end of the seventh switch tube is electrically connected to the comparison circuit, one communication end of the seventh switch tube is electrically connected to the boost circuit, and the other communication end of the seventh switch tube is electrically connected to the output terminal and the voltage stabilizing capacitor.

6. The pre-driver chip of claim 2, wherein, The pre-drive chip further comprises: A second switch circuit electrically connected between the output terminal and the output port, for controlling the on-off of the electrical path between the output terminal and the output port.

7. The pre-driver chip of claim 2, wherein, One end of the voltage stabilizing capacitor is electrically connected with the output terminal and the first switch circuit, and the other end is electrically connected with the power port.

8. The pre-driver chip of claim 1, wherein, The power voltage is 48v.

9. A vehicle-mounted pre-drive system, characterized by, The pre-drive chip comprises: The pre-drive chip of any one of claims 1 to 7; A peripheral switch circuit electrically connected with the output terminal, and both connected with the voltage boosting circuit to the power voltage.

10. A vehicle characterized by comprising: The vehicle-mounted pre-drive system of claim 8 or 9.

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