An automotive power module integrating a buck circuit and an LDO circuit and a method of using the same

Abstract

The application relates to an integrated BUCK circuit and LDO circuit automobile power module and a use method thereof, the integrated BUCK circuit and LDO circuit automobile power module comprising a battery management system (BMS), an LDO circuit for preventing the BMS from being disturbed and wrongly woken up, and a double BUCK circuit for alternately charging a storage battery; a control module of an automobile is connected with the BMS through the LDO circuit, the BMS is connected with a power battery, and the power battery is connected with the double BUCK circuit. The application adopts a low-cost LDO circuit, can wake up the power management system of the power battery, and has high reliability; two BUCK circuits are adopted to alternately charge the storage battery, and the structure is simple; compared with a traditional scheme, the service life of the storage battery can be effectively prolonged, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile power supply, and particularly relates to an automobile power supply module integrated with a BUCK circuit and an LDO circuit and a use method thereof. BACKGROUND

[0002] Currently, when the power battery of a new energy automobile charges the storage battery on the vehicle, a pulse charging method can be used for fast charging to quickly fill the storage battery with electricity, but this charging method not only reduces the service life of the battery when charging the storage battery, but also has a certain overcharging danger and low safety. SUMMARY

[0003] The application aims to provide an automobile power supply module integrated with a BUCK circuit and an LDO circuit and a use method thereof to solve the above problems.

[0004] The application achieves the above-mentioned purpose through the following technical solutions:

[0005] The automobile power supply module integrated with a BUCK circuit and an LDO circuit comprises a battery management system BMS, an LDO circuit for preventing the BMS from being disturbed and miswoken, and a double-BUCK circuit for alternately charging the storage battery; the control module of the automobile is connected with the battery management system BMS through the LDO circuit, the battery management system BMS is connected with the power battery, and the power battery is connected with the double-BUCK circuit.

[0006] As a further optimization scheme of the application, the LDO circuit comprises a voltage stabilizing chip U1, when it is needed to wake up the power battery to charge the storage battery, the control module outputs a wake-up instruction to the voltage stabilizing chip U1, the voltage stabilizing chip U1 outputs the wake-up instruction to the battery management system BMS, and the battery management system BMS wakes up the power battery to charge the storage battery after receiving the wake-up instruction.

[0007] As a further optimization scheme of the present application, the LDO circuit further comprises a fourth diode D4, a fifth diode D5, a fuse F1, a fifth capacitor C5, a fifth resistor R5, a sixth resistor R6 and a second capacitor C2, the VDD pin of the voltage stabilizing chip U1 is connected with the first end of the fuse F1, the first end of the fifth capacitor C5 and the first end of the fifth resistor R5, the second end of the fuse F1 is connected with the cathode of the fifth diode D5, the anode of the fifth diode D5 is connected with the control module and the cathode of the fourth diode D4, the anode of the fourth diode D4 is grounded, and the second end of the fifth capacitor C5 is grounded; the CE pin of the voltage stabilizing chip U1 is connected with the second end of the fifth resistor R5, the first end of the sixth resistor R6 and the first end of the second capacitor C2, the second end of the sixth resistor R6 and the second end of the second capacitor C2 are grounded; the Vout pin of the voltage stabilizing chip U1 is connected with the battery management system BMS; and the GND pin of the voltage stabilizing chip U1 is grounded.

[0008] As a further optimization scheme of the present application, the double BUCK circuit comprises a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a first switch tube MOS1, a second diode D2, a second switch tube MOS2, a fourth resistor R4, a second capacitor C2, a first inductor L1, a second inductor L2, a third capacitor C3, a third switch tube MOS3, a fourth switch tube MOS4, a third diode D3 and a fourth capacitor C4.

[0009] The first end of the first inductor L1 is connected with the first end of the fourth resistor R4 and the first end of the second capacitor C2, the second end of the first inductor L1 is connected with the battery, the first end of the second inductor L2 and the first end of the third capacitor C3, the second end of the fourth resistor R4 is connected with the drain of the first switch tube MOS1, the drain of the second switch tube MOS2 and the anode of the second diode D2, the cathode of the second diode is connected with the source of the first switch tube MOS1, the first end of the first capacitor C1, the first end of the second resistor R2 and the cathode of the first diode D1, the second end of the second resistor R2 is connected with the first end of the third resistor R3, and the anode of the first diode D1 is connected with the first end of the first resistor R1;

[0010] The second end of the second inductor L2 is connected with the drain of the fourth switch tube MOS4, the drain of the third switch tube MOS3 and the anode of the third diode D3, the cathode of the third diode D3 is connected with the source of the third switch tube MOS3 and the first end of the fourth capacitor C4; the second end of the fourth capacitor C4, the source of the fourth switch tube MOS4, the second end of the third capacitor C3, the second end of the second capacitor C2, the source of the second switch tube MOS2, the second end of the first capacitor C1, the second end of the third resistor R3 and the second end of the first resistor R1 are connected with each other and grounded.

[0011] As a further optimization scheme of the present application, the gates of the first switch tube MOS1, the second switch tube MOS2, the third switch tube MOS3 and the fourth switch tube MOS4 are connected with a single-chip microcomputer on the automobile for outputting PWM control.

[0012] A use method of the automobile power module integrating the BUCK circuit and the LDO circuit, comprising the following steps:

[0013] When it is needed to wake up the power battery to charge the storage battery, the control module outputs a wake-up instruction to the voltage stabilizing chip U1, the voltage stabilizing chip U1 outputs the wake-up instruction to the battery management system BMS, and the battery management system BMS wakes up the power battery to charge the storage battery after receiving the wake-up instruction, so that the battery management system BMS is prevented from being disturbed and falsely woken up.

[0014] When the power battery charges the storage battery, the single-chip microcomputer controls the first switch tube M1 and the fourth switch tube M4 to be turned on, and then charges the storage battery through the first inductor L1 and the second capacitor C2, after a preset time, the single-chip microcomputer controls the first switch tube M1 and the fourth switch tube M4 to be turned off, and simultaneously controls the second switch tube M2 and the third switch tube M3 to be turned on, and then charges the storage battery through the second inductor L2 and the third capacitor C3, so that the two BUCK circuits alternately charge the storage battery.

[0015] The present application has the advantages that:

[0016] The present application adopts the low-cost LDO circuit, wakes up the power management system of the power battery, and has high reliability; the two BUCK circuits are adopted to alternately charge the storage battery, and the structure is simple; compared with the traditional scheme, the service life of the storage battery can be effectively increased, and the safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the circuit diagram of the LDO circuit of the power module in the embodiment of the present application;

[0018] Figure 2 is the circuit diagram of the double BUCK circuit of the power module in the embodiment of the present application. DETAILED DESCRIPTION

[0019] The application will be further described in details below with reference to the drawings. It is necessary to point out that the following detailed description is only used to further illustrate the application and cannot be understood as limiting the protection scope of the application. The skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0020] An automobile power module integrating a BUCK circuit and an LDO circuit includes a battery management system (BMS), an LDO circuit for preventing the BMS from being disturbed and falsely woken up, and a double BUCK circuit for alternately charging a storage battery. A control module of an automobile is connected with the BMS through the LDO circuit, the BMS is connected with a power battery, and the power battery is connected with the double BUCK circuit. Specifically, the automobile power module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a first switch tube M1, a second switch tube M2, a third switch tube M3, a fourth switch tube M4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first inductor L1, a second inductor L2, and a fuse F1.

[0021] As shown in Figure 2 the double BUCK circuit includes the first diode D1, the first resistor R1, the second resistor R2, the third resistor R3, the first capacitor C1, a first switch tube MOS1, the second diode D2, a second switch tube MOS2, the fourth resistor R4, the second capacitor C2, the first inductor L1, the second inductor L2, the third capacitor C3, a third switch tube MOS3, a fourth switch tube MOS4, the third diode D3, and the fourth capacitor C4.

[0022] A first end of the first inductor L1 is connected with a first end of the fourth resistor R4 and a first end of the second capacitor C2, a second end of the first inductor L1 is connected with the storage battery, a first end of the second inductor L2, and a first end of the third capacitor C3, a second end of the fourth resistor R4 is connected with a drain of the first switch tube MOS1, a drain of the second switch tube MOS2, and an anode of the second diode D2, a cathode of the second diode is connected with a source of the first switch tube MOS1, a first end of the first capacitor C1, a first end of the second resistor R2, and a cathode of the first diode D1, a second end of the second resistor R2 is connected with a first end of the third resistor R3, and an anode of the first diode D1 is connected with a first end of the first resistor R1.

[0023] The second end of the second inductor L2 is connected with the drain of the fourth switch tube MOS4, the drain of the third switch tube MOS3 and the anode of the third diode D3, the cathode of the third diode D3 is connected with the source of the third switch tube MOS3 and the first end of the fourth capacitor C4; the second end of the fourth capacitor C4, the source of the fourth switch tube MOS4, the second end of the third capacitor C3, the second end of the second capacitor C2, the source of the second switch tube MOS2, the second end of the first capacitor C1, the second end of the third resistor R3 and the second end of the first resistor R1 are connected with each other and grounded.

[0024] Wherein the gate of the first switch tube M1 to the fourth switch tube M4 is connected with the single-chip microcomputer, and PWM control is realized, when the power battery needs to charge the storage battery, the single-chip microcomputer controls the first switch tube M1 and the fourth switch tube M4 to be turned on, and then the first inductor L1 and the second capacitor C2 (the first BUCK circuit) are used to charge the storage battery, after a period of time, the single-chip microcomputer controls the first switch tube M1 and the fourth switch tube M4 to be turned off, and simultaneously controls the second switch tube M2 and the third switch tube M3 to be turned on, and then the second inductor L2 and the third capacitor C3 (the second BUCK circuit) are used to charge the storage battery.

[0025] Compared with the existing charging by pulse mode, the first BUCK circuit and the second BUCK circuit can be alternately charged by the single-chip microcomputer PWM control, and the service life is improved.

[0026] As shown in Figure 1 The LDO circuit includes a voltage stabilizing chip U1, a fourth diode D4, a fifth diode D5, a fuse F1, a fifth capacitor C5, a fifth resistor R5, a sixth resistor R6 and a second capacitor C2, the VDD pin of the voltage stabilizing chip U1 is connected with the first end of the fuse F1, the first end of the fifth capacitor C5 and the first end of the fifth resistor R5, the second end of the fuse F1 is connected with the cathode of the fifth diode D5, the anode of the fifth diode D5 is connected with the control module and the cathode of the fourth diode D4, the anode of the fourth diode D4 is grounded, and the second end of the fifth capacitor C5 is grounded; the CE pin of the voltage stabilizing chip U1 is connected with the second end of the fifth resistor R5, the first end of the sixth resistor R6 and the first end of the second capacitor C2, the second end of the sixth resistor R6 and the second end of the second capacitor C2 are grounded; the Vout pin of the voltage stabilizing chip U1 is connected with the battery management system BMS; and the GND pin of the voltage stabilizing chip U1 is grounded.

[0027] When the power battery needs to be woken up to charge the storage battery, the control module outputs a wake-up instruction to the voltage stabilizing chip U1, the voltage stabilizing chip U1 outputs a wake-up signal to the BMS, and the BMS wakes up the power battery to charge the storage battery after receiving the wake-up signal.

[0028] A use method of an automobile power module integrating a BUCK circuit and an LDO circuit, comprising the following steps:

[0029] When the power battery needs to be woken up to charge the storage battery, the control module outputs a wake-up instruction to the voltage stabilizing chip U1, the voltage stabilizing chip U1 outputs a wake-up signal to the BMS, and the BMS wakes up the power battery to charge the storage battery after receiving the wake-up signal.

[0030] When the power battery charges the storage battery, the single-chip microcomputer controls the first switch tube M1 and the fourth switch tube M4 to be turned on, and then charges the storage battery through the first inductor L1 and the second capacitor C2; after a preset time, the single-chip microcomputer controls the first switch tube M1 and the fourth switch tube M4 to be turned off, and controls the second switch tube M2 and the third switch tube M3 to be turned on at the same time, and then charges the storage battery through the second inductor L2 and the third capacitor C3, so as to realize the alternation of the two BUCK circuits to charge the storage battery.

[0031] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. An automotive power module integrating a BUCK circuit and an LDO circuit, characterized by, The application relates to a battery management system (BMS) and an LDO circuit for preventing the BMS from being disturbed and falsely woken up, and a double-BUCK circuit for alternately charging a storage battery; a control module of a vehicle is connected with the BMS through the LDO circuit, the BMS is connected with a power battery, and the power battery is connected with the double-BUCK circuit. The double-BUCK circuit comprises a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a first switch tube MOS1, a second diode D2, a second switch tube MOS2, a fourth resistor R4, a second capacitor C2, a first inductor L1, a second inductor L2, a third capacitor C3, a third switch tube MOS3, a fourth switch tube MOS4, a third diode D3 and a fourth capacitor C4. A first end of the first inductor L1 is connected with a first end of the fourth resistor R4 and a first end of the second capacitor C2, a second end of the first inductor L1 is connected with the storage battery, a first end of the second inductor L2 and a first end of the third capacitor C3, a second end of the fourth resistor R4 is connected with a drain of the first switch tube MOS1, a drain of the second switch tube MOS2 and an anode of the second diode D2, a cathode of the second diode is connected with a source of the first switch tube MOS1, a first end of the first capacitor C1, a first end of the second resistor R2 and a cathode of the first diode D1, a second end of the second resistor R2 is connected with a first end of the third resistor R3, and an anode of the first diode D1 is connected with a first end of the first resistor R1. A second end of the second inductor L2 is connected with a drain of the fourth switch tube MOS4, a drain of the third switch tube MOS3 and an anode of the third diode D3, a cathode of the third diode D3 is connected with a source of the third switch tube MOS3 and a first end of the fourth capacitor C4, a second end of the fourth capacitor C4, a source of the fourth switch tube MOS4, a second end of the third capacitor C3, a second end of the second capacitor C2, a source of the second switch tube MOS2, a second end of the first capacitor C1, a second end of the third resistor R3 and a second end of the first resistor R1 are connected with each other and grounded.

2. The automobile power module integrated with BUCK circuit and LDO circuit according to claim 1, characterized in that, The LDO circuit comprises a voltage stabilizing chip U1, when it is needed to wake up the power battery to charge the storage battery, the control module outputs a wake-up instruction to the voltage stabilizing chip U1, the voltage stabilizing chip U1 outputs the wake-up instruction to the BMS, and the BMS wakes up the power battery to charge the storage battery after receiving the wake-up instruction.

3. The automotive power module integrating a BUCK circuit and an LDO circuit according to claim 2, characterized in that, The LDO circuit further comprises a fourth diode D4, a fifth diode D5, a fuse F1, a fifth capacitor C5, a fifth resistor R5, a sixth resistor R6 and a second capacitor C2, the VDD pin of the voltage stabilizing chip U1 is connected with the first end of the fuse F1, the first end of the fifth capacitor C5 and the first end of the fifth resistor R5, the second end of the fuse F1 is connected with the cathode of the fifth diode D5, the anode of the fifth diode D5 is connected with the control module and the cathode of the fourth diode D4, the anode of the fourth diode D4 is grounded, and the second end of the fifth capacitor C5 is grounded; the CE pin of the voltage stabilizing chip U1 is connected with the second end of the fifth resistor R5, the first end of the sixth resistor R6 and the first end of the second capacitor C2, the second end of the sixth resistor R6 and the second end of the second capacitor C2 are grounded; the Vout pin of the voltage stabilizing chip U1 is connected with the battery management system BMS; and the GND pin of the voltage stabilizing chip U1 is grounded.

4. The automotive power module integrating a BUCK circuit and an LDO circuit according to claim 1, characterized in that, The gates of the first switch tube MOS1, the second switch tube MOS2, the third switch tube MOS3 and the fourth switch tube MOS4 are connected with a single-chip microcomputer for outputting PWM control on the automobile.

5. A method of using an automotive power supply module integrating a BUCK circuit and an LDO circuit according to any one of claims 1 to 4, characterized in that, The method comprises the following steps: When it is needed to wake up the power battery to charge the storage battery, the control module outputs a wake-up instruction to the voltage stabilizing chip U1, the voltage stabilizing chip U1 outputs the wake-up instruction to the battery management system BMS, and the battery management system BMS wakes up the power battery to charge the storage battery after receiving the wake-up instruction, so as to prevent the battery management system BMS from being disturbed and mistakenly woken up; When the power battery charges the storage battery, the single-chip microcomputer controls the first switch tube M1 and the fourth switch tube M4 to be turned on, so as to charge the storage battery through the first inductor L1 and the second capacitor C2, after a preset time, the single-chip microcomputer controls the first switch tube M1 and the fourth switch tube M4 to be turned off, and simultaneously controls the second switch tube M2 and the third switch tube M3 to be turned on, so as to charge the storage battery through the second inductor L2 and the third capacitor C3, and the two BUCK circuits are alternately used to charge the storage battery.

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