A power supply system

Abstract

The embodiment of the present invention provides a power supply system, comprising: a power supply module, a conversion module, a control module and a driving module electrically connected in sequence; the power supply module provides a voltage signal to the conversion module; the conversion module generates a pulse signal according to the voltage signal, and generates a control signal according to the pulse signal; the control module controls the driving module to perform intermittent charging and discharging according to the control signal. The power supply system provided by the embodiment of the present invention generates a pulse signal through the conversion module after the power supply module provides a working voltage, and the control module controls the driving module to perform intermittent charging and discharging according to the pulse signal, thereby improving the stability of the power supply system.

Description

Technical Field

[0001] The invention relates to battery power supply circuit technology, and in particular to a power supply system. Background Art

[0002] For current FET driver technology, low-power FET drivers are either very expensive; or the voltage range is too narrow and not suitable for battery systems with slightly higher voltages; or the static power consumption is too high, and the comprehensive selection basically fails to meet the use requirements, especially for automotive-grade FET drivers. The current supply range generated by the pulse is too narrow, and only the highest string of cells can be used for power supply. The output voltage of the battery fluctuates greatly under various ambient temperatures and different power conditions. The FET is prone to low stability problems when the current generated by the pulse waveform fluctuates in a wide range of battery voltage. Summary of the invention

[0003] A charge pump driven power supply system provided in an embodiment of the present invention solves the problem of low stability of the power supply system in a low-voltage system of an electric vehicle in the prior art.

[0004] An embodiment of the present invention provides a charge pump driven power supply system, comprising: a power supply module, a conversion module, a control module and a driving module electrically connected in sequence;

[0005] The power supply module provides a voltage signal to the conversion module;

[0006] The conversion module generates a pulse signal according to the voltage signal, and generates a control signal according to the pulse signal;

[0007] The control module controls the driving module to perform intermittent charging and discharging according to the control signal.

[0008] The power supply module optionally includes a battery pack, which includes a plurality of electrically connected batteries, and the battery pack includes a first positive output terminal and a first negative output terminal formed by some batteries connected in series, the first positive output terminal is electrically connected to the first port of the conversion module, and the first negative output terminal is electrically connected to the second port of the control module.

[0009] Optionally, the battery pack further includes a second positive output terminal and a second negative output terminal formed by connecting all batteries in series;

[0010] The second positive output terminal and the second negative output terminal are used to provide a power interface for an external device.

[0011] Optionally, the conversion module includes a BMS, a charge pump and a voltage regulator;

[0012] The first input terminal of the BMS is electrically connected to the power module, the second input terminal of the BMS is electrically connected to the power module, and the output terminal of the BMS is electrically connected to the first input terminal of the charge pump;

[0013] The second input terminal of the charge pump is electrically connected to the second terminal of the voltage regulator, and the output terminal of the charge pump is electrically connected to the control module;

[0014] The first end of the voltage regulator is electrically connected to the power module.

[0015] Optionally, the control module includes a first resistor, a second field effect transistor, a third field effect transistor and a fourth field effect transistor;

[0016] The first end of the first resistor is electrically connected to the power module, and the second end of the first resistor is electrically connected to the first end of the fourth field effect transistor;

[0017] The second end of the fourth field effect tube is electrically connected to the first output end of the charge pump, and the third end of the fourth field effect tube is electrically connected to the power module;

[0018] The first end of the second field effect tube is electrically connected to the power module, the second end of the second field effect tube is electrically connected to the first end of the fourth field effect tube, and the third end of the second field effect tube is electrically connected to the first end of the third field effect tube;

[0019] The second end of the third field effect tube is electrically connected to the first end of the fourth field effect tube, and the third end of the third field effect tube is electrically connected to the power module.

[0020] Optionally, the second field effect transistor and the fourth field effect transistor are both NPN transistors or MOS transistors, and the third field effect transistor is a PNP transistor or MOS transistor.

[0021] Optionally, the driving module includes a first diode, a second diode, a first capacitor, a second capacitor and a first field effect transistor;

[0022] A first end of the first diode is electrically connected to the power module, and a second end of the first diode is electrically connected to a first end of the second diode;

[0023] The second end of the second diode is electrically connected to the first end of the second capacitor;

[0024] The second end of the second capacitor is electrically connected to the first end of the third field effect transistor;

[0025] A first end of the first capacitor is electrically connected to the conversion module, and a second end of the first capacitor is electrically connected to a first end of the second diode;

[0026] The second end of the third field effect transistor is electrically connected to the first end of the second capacitor, and the third end of the third field effect transistor is electrically connected to the power module.

[0027] Optionally, the pulse signal is a high level signal or a low level signal.

[0028] Optionally, the conversion module is used to control the driving module to perform intermittent charging when the pulse signal is a high-level signal, and to control the driving module to perform intermittent discharging when the pulse signal is a low-level signal; the low-level signal is used to control the first capacitor to discharge and charge the second capacitor.

[0029] Optionally, the charge pump is used to generate a PWM waveform signal, and the PWM waveform signal is used to drive the control module.

[0030] The embodiment of the present invention provides a power supply system, comprising: a power supply module, a conversion module, a control module and a driving module electrically connected in sequence; the power supply module provides a voltage signal to the conversion module; the conversion module generates a pulse signal according to the voltage signal, and generates a control signal according to the pulse signal; the control module controls the driving module to perform intermittent charging and discharging according to the control signal. The power supply system provided by the embodiment of the present invention generates a pulse signal through the conversion module after the power supply module provides a working voltage, and the control module controls the driving module to perform intermittent charging and discharging according to the pulse signal, thereby improving the stability of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A module structure diagram of a power supply system provided by an embodiment of the present invention;

[0032] Figure 2 A circuit diagram of a power supply system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0034] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0035] Figure 1 A module structure diagram of a power supply system provided in an embodiment of the present invention, a power supply system provided in this embodiment includes: a power supply module 1, a conversion module 2, a control module 3 and a drive module 4 electrically connected in sequence; the power supply module 1 is used to provide a voltage signal to the conversion module 2; the conversion module 2 is used to generate a pulse signal according to the voltage signal, and generate a control signal according to the pulse signal; the control module 3 is used to control the drive module 4 to perform intermittent charging and discharging according to the control signal.

[0036] In this embodiment, MOSFET (field effect transistor) is usually used in the low-voltage system of electric vehicles to control the control system. The field effect transistor has excellent switching speed, can achieve multiple short-circuit protection, can continue to be used without maintenance after the external fault disappears, and has flexible charge and discharge direction control. The power module 1 is used to generate the power supply voltage and provide the converted voltage signal to the conversion module 2, wherein the power supply voltage is generally the battery voltage provided by the lithium battery. The conversion module 2 generates a pulse signal and a control signal according to the voltage signal, wherein the pulse signal is a discrete signal with various shapes. Compared with ordinary analog signals (such as sine waves), the waveforms are discontinuous on the Y axis (there is a clear interval between the waveforms), but it has a certain periodicity. It is characterized by it. The control module 3 controls the drive module 4 to perform intermittent charging and discharging according to the control signal.

[0037] The power supply system provided in this embodiment includes a power module, a conversion module, a control module and a driving module which are electrically connected in sequence; the power module provides a voltage signal to the conversion module; the conversion module generates a pulse signal according to the voltage signal, and generates a control signal according to the pulse signal; the control module controls the driving module to perform intermittent charging and discharging according to the control signal. In the above-mentioned power supply system, after the power module provides the working voltage, and generates a pulse signal through the conversion module, the control module controls the driving module to perform intermittent charging and discharging according to the pulse signal, thereby improving the working stability of the power supply system.

[0038] In another embodiment, optionally, the power supply module 1 includes a battery pack, the battery pack includes a plurality of electrically connected batteries, the battery pack includes a first positive output terminal and a first negative output terminal formed by connecting some batteries in series, the first positive output terminal is electrically connected to the first port of the conversion module, and the first negative output terminal is electrically connected to the second port of the control module.

[0039] In this embodiment, refer to Figure 2 , Figure 2 is the circuit diagram of a power supply system provided in this embodiment. In this embodiment, the battery pack includes a plurality of lithium batteries CELL1-CELLm connected in series. Specifically, the number of lithium batteries is not specifically limited in this embodiment. The connection of multiple lithium batteries in series includes a plurality of positive output terminals. Among them, the first positive output terminal is lithium batteries CELL1-CELLn-1, where 1 < n < m. The first positive output terminal can be adjusted adaptively according to the actual situation. Exemplarily, it can be the positive output terminal of two lithium batteries connected in series or the positive output terminal of three lithium batteries connected in series.

[0040] Optionally, the battery pack further includes a second positive output terminal and a second negative output terminal formed by connecting all the batteries in series.

[0041] In this embodiment, the second positive output terminal is the output positive electrode of all lithium batteries, and the second negative output terminal is the output negative electrode of all lithium batteries. The output voltage is connected to an external device connected to the field effect transistor drive system and provides power for the external device. Exemplarily, the external device can be multiple components of an electric vehicle, such as an instrument panel, etc.

[0042] Optionally, the conversion module 2 includes a BMS, a charge pump, and a voltage regulator; the first input terminal of the BMS is electrically connected to the power supply module 1, the second input terminal of the BMS is electrically connected to the power supply module 1, and the output terminal of the BMS is electrically connected to the first input terminal of the charge pump; the second input terminal of the charge pump is electrically connected to the second terminal of the voltage regulator, and the output terminal of the charge pump is electrically connected to the control module 3; the first terminal of the voltage regulator is electrically connected to the power supply module 1. The charge pump is used to generate a PWM waveform signal, and the PWM waveform signal is used to drive the control module.

[0043] In this embodiment, the battery management system is mainly for intelligent management and maintenance of each battery unit, to prevent overcharging and over-discharging of the battery, to extend the mission life of the battery, and to monitor the status of the battery. Generally, the battery management system includes a main control terminal, a server end, a mobile client terminal, and multiple BMS battery management system units, and the main control terminal and the mobile client terminal are connected to the server end; the BMS battery management system unit includes a BMS battery management system, a control module, a display module, a wireless communication module, an electrical device, a battery pack, and an acquisition module, which can realize real-time remote monitoring of the BMS battery management system without on-site detection, reducing the difficulty of battery pack maintenance, fully saving human resources, time and production costs, and can be widely used in the field of battery pack monitoring. Specifically, the first input terminal and the second input terminal of the BMS are respectively connected to the first port and the second port of the power module 1, wherein the first port is the second positive output terminal of the power module 1 in the above embodiment, and the second short circuit is the negative output terminal in the above embodiment.

[0044] In this embodiment, the model of the charge pump U1 is REG71055. Specifically, the charge pump is a DC-DC converter that uses a capacitor as an energy storage element and is mostly used to generate an output voltage greater than the input voltage, or to generate a negative output voltage. The working process of the charge pump is: first store energy, and then release the energy in a controlled manner to obtain the required output voltage. Exemplarily, the switching regulator boost pump uses an inductor to store energy, while the capacitive charge pump uses a capacitor to store energy. The voltage regulator LDO is a linear step-down voltage regulator. After the system is powered on, if the enable pin is at a high level, the circuit starts to start, the constant current source circuit provides bias for the entire circuit, the reference source voltage is quickly established, and the output continues to rise with the input. When the output is about to reach the specified value, the output feedback voltage obtained by the feedback network is also close to the reference voltage value. At this time, the error amplifier amplifies the small error signal between the output feedback voltage and the reference voltage, and then amplifies it to the output through the adjustment tube, thereby forming a negative feedback, ensuring that the output voltage is stable at the specified value. Similarly, if the input voltage changes or the output current changes, this closed loop will keep the output voltage unchanged. In this embodiment, the voltage regulator LDO stabilizes the high voltage after reducing it and provides stable and reliable power supply to the charge pump U1. Using the PWM generation of the charge pump U1, compared with the PWM output circuit built with other discrete devices, it can reduce power consumption and increase reliability. Compared with the voltage of a single string of batteries, multi-string battery power supply can provide a higher holding voltage to drive the MOSFET.

[0045] Optionally, the control module 3 includes a first resistor, a second field effect transistor, a third field effect transistor and a fourth field effect transistor; the first end of the first resistor is electrically connected to the power module 1, and the second end of the first resistor is electrically connected to the first end of the fourth field effect transistor; the second end of the fourth field effect transistor is electrically connected to the first output end of the charge pump, and the third end of the fourth field effect transistor is electrically connected to the power module 1; the first end of the second field effect transistor is electrically connected to the power module 1, the second end of the second field effect transistor is electrically connected to the first end of the fourth field effect transistor, and the third end of the second field effect transistor is electrically connected to the first end of the third field effect transistor; the second end of the third field effect transistor is electrically connected to the first end of the fourth field effect transistor, and the third end of the third field effect transistor is electrically connected to the power module 1.

[0046] In this embodiment, the control module 3 includes a resistor R1, a MOS transistor Q2, a MOS transistor Q3, and a MOS transistor Q4. Specifically, the first end of the resistor R1 is electrically connected to the power module 1, the second end of the resistor R1 is electrically connected to the first end of the MOS transistor Q4, the second end of the MOS transistor Q4 is electrically connected to the first output end of the charge pump U1, and the third end of the MOS transistor Q4 is electrically connected to the power module 1. The first end of the MOS transistor Q2 is electrically connected to the power module 1, the second end of the MOS transistor Q2 is electrically connected to the first end of the MOS transistor Q4, and the third end of the MOS transistor Q2 is electrically connected to the first end of the MOS transistor Q3; the second end of the MOS transistor Q3 is electrically connected to the first end of the MOS transistor Q4, and the third end of the MOS transistor Q3 is electrically connected to the power module 1.

[0047] Optionally, the second field effect transistor and the fourth field effect transistor are both NPN transistors, and the third field effect transistor is a PNP transistor.

[0048] In this embodiment, MOS transistor Q2 and MOS transistor Q4 are both NPN transistors. NPN transistors are composed of three semiconductors, including two N-type and one P-type semiconductors, with the P-type semiconductor in the middle and the two N-type semiconductors on both sides. The transistor is the most important device in the electronic circuit, and its main functions are current amplification and switching. The PNP transistor is a transistor composed of two P-type semiconductors with one N-type semiconductor in the middle, so it is called a PNP transistor. It can also be described as a transistor into which current flows from the emitter E.

[0049] Optionally, the driving module 4 includes a first diode, a second diode, a first capacitor, a second capacitor and a first field effect transistor;

[0050] A first end of the first diode is electrically connected to the power module 1, and a second end of the first diode is electrically connected to a first end of the second diode;

[0051] The second end of the second diode is electrically connected to the first end of the second capacitor;

[0052] The second end of the second capacitor is electrically connected to the first end of the third field effect transistor;

[0053] A first end of the first capacitor is electrically connected to the conversion module 2, and a second end of the first capacitor is electrically connected to a first end of the second diode;

[0054] The second end of the third field effect transistor is electrically connected to the first end of the second capacitor, and the third end of the third field effect transistor is electrically connected to the power module 1 .

[0055] In this embodiment, the driving module 4 includes a diode D1, a diode D2, a capacitor C1, a capacitor C2 and a MOS transistor Q1. The first end of the diode D1 is electrically connected to the power module 1, the second end of the diode D1 is electrically connected to the first end of the diode D2, and the second end of the diode D2 is electrically connected to the first end of the capacitor C2. The second end of the capacitor C2 is electrically connected to the first end of the MOS transistor Q3, the first end of the capacitor C1 is electrically connected to the conversion module 2, the second end of the capacitor C1 is electrically connected to the first end of the diode D2. The second end of the MOS transistor Q3 is electrically connected to the first end of the capacitor C2, and the third end of the MOS transistor Q3 is electrically connected to the power module 1.

[0056] Specifically, the voltage regulator LDO and the charge pump U1 are connected between CELLn and CELLm of the high-string battery, and the charge pump U1 is connected to the level conversion circuit composed of resistor R1, MOS tube Q2, MOS tube Q3, and MOS tube Q4. The voltage regulator LDO is used to adapt to different input voltage conditions, but the level conversion circuit (resistor R1, MOS tube Q2, MOS tube Q3, and MOS tube Q4) is also added to increase the maximum charging voltage of the carrying capacitor C1, and finally achieve the function of increasing the voltage of the holding capacitor C2. The battery management system BMS enables the charge pump U1 according to the battery status. At this time, the charge pump U1 starts to work, and its fourth pin outputs a PWM waveform. When the PWM waveform output by the charge pump U1 is a high level, MOS tube Q3 and MOS tube Q4 are closed, MOS tube Q2 is disconnected, and the capacitor C1 starts to charge, and is charged to When the PWM waveform output by the charge pump U1 is at a low level, the MOS tube Q2 is closed, the MOS tube Q4 and the MOS tube Q3 are disconnected, and the switching capacitor C1 charges the holding capacitor C2 after passing through the diode D2, and the charge of the capacitor C1 is transferred to the holding capacitor C2, and the maximum charging voltage of C2 reaches Vc2=Vc1-Vd2. Accordingly, the charge pump U1 repeatedly outputs high and low level signals, and the voltage of the holding capacitor C2 can be maintained at a relatively high and stable value, thereby achieving the effect of maintaining the high-side MOSFET Q1 closed. Since the charging voltage of the capacitor C1 uses the voltage of multiple strings of batteries, the capacitor C2 can be maintained at a relatively high voltage, and can reliably drive the field effect tube. Generally speaking, the battery voltage is about 2.5-4.2V, and the reliable driving voltage of the field effect tube requires 8-20V. Therefore, in this embodiment, it is preferred to use mn equal to 3 to 4 strings of batteries to more reliably drive the field effect tube.

[0057] Optionally, the pulse signal is a high level signal or a low level signal.

[0058] Optionally, the conversion module 2 is used to control the driving module 4 to perform intermittent charging when the pulse signal is a high-level signal, and to control the driving module 4 to perform intermittent discharging when the pulse signal is a low-level signal.

[0059] Optionally, the low-level signal is used to control the first capacitor to discharge and to charge the second capacitor.

[0060] In this embodiment, the pulse signal is a discrete signal with various shapes. Compared with ordinary analog signals (such as sine waves), the waveforms are discontinuous on the Y axis (there are obvious intervals between waveforms), but it has a certain periodicity. The control module 3 controls the output module 3 through the pulse signal to control the output module 3 to perform intermittent charging and discharging.

[0061] The power supply system provided in this embodiment includes a power module, a conversion module, a control module and a driving module which are electrically connected in sequence; the power module provides a voltage signal to the conversion module; the conversion module generates a pulse signal according to the voltage signal, and generates a control signal according to the pulse signal; the control module controls the driving module to perform intermittent charging and discharging according to the control signal. In the above-mentioned power supply system, after the power module provides the working voltage, and generates a pulse signal through the conversion module, the control module controls the driving module to perform intermittent charging and discharging according to the pulse signal, thereby improving the working stability of the power supply system.

[0062] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power supply system, characterized in that: include: A power module, a conversion module, a control module and a drive module electrically connected in sequence; The power supply module provides a voltage signal to the conversion module; The conversion module generates a pulse signal according to the voltage signal, and generates a control signal according to the pulse signal, and the conversion module includes a BMS, a charge pump and a voltage regulator; the first input end of the BMS is electrically connected to the power module, the second input end of the BMS is electrically connected to the power module, and the output end of the BMS is electrically connected to the first input end of the charge pump; the second input end of the charge pump is electrically connected to the second end of the voltage regulator, and the output end of the charge pump is electrically connected to the control module; the first end of the voltage regulator is electrically connected to the power module; The control module controls the driving module to perform intermittent charging and discharging according to the control signal, and the control module includes a first resistor, a second field effect transistor, a third field effect transistor and a fourth field effect transistor; the first end of the first resistor is electrically connected to the power module, and the second end of the first resistor is electrically connected to the first end of the fourth field effect transistor; the second end of the fourth field effect transistor is electrically connected to the first output end of the charge pump, and the third end of the fourth field effect transistor is electrically connected to the power module; the first end of the second field effect transistor is electrically connected to the power module, the second end of the second field effect transistor is electrically connected to the first end of the fourth field effect transistor, and the third end of the second field effect transistor is electrically connected to the first end of the third field effect transistor; the second end of the third field effect transistor is electrically connected to the first end of the fourth field effect transistor, and the third end of the third field effect transistor is electrically connected to the power module.

2. The system according to claim 1, characterized in that The power module includes a battery pack, which includes a plurality of electrically connected batteries. The battery pack includes a first positive output terminal and a first negative output terminal formed by some batteries connected in series, the first positive output terminal is electrically connected to the first port of the conversion module, and the first negative output terminal is electrically connected to the second port of the control module.

3. The system according to claim 2, characterized in that The battery pack also includes a second positive output terminal and a second negative output terminal formed by connecting all batteries in series; The second positive output terminal and the second negative output terminal are used to provide a power interface for an external device.

4. The system according to claim 1, characterized in that The second field effect transistor and the fourth field effect transistor are both NPN transistors or MOS transistors, and the third field effect transistor is a PNP transistor or MOS transistor.

5. The system according to claim 4, characterized in that The driving module includes a first diode, a second diode, a first capacitor, a second capacitor and a first field effect transistor; A first end of the first diode is electrically connected to the power module, and a second end of the first diode is electrically connected to a first end of the second diode; The second end of the second diode is electrically connected to the first end of the second capacitor; The second end of the second capacitor is electrically connected to the first end of the third field effect transistor; A first end of the first capacitor is electrically connected to the conversion module, and a second end of the first capacitor is electrically connected to a first end of the second diode; The second end of the third field effect transistor is electrically connected to the first end of the second capacitor, and the third end of the third field effect transistor is electrically connected to the power module.

6. The system according to claim 5, characterized in that The pulse signal is a high level signal or a low level signal.

7. The system according to claim 6, characterized in that The conversion module is used to control the driving module to perform intermittent charging when the pulse signal is a high-level signal, and to control the driving module to perform intermittent discharging when the pulse signal is a low-level signal; the low-level signal is used to control the first capacitor to discharge and charge the second capacitor.

8. The system according to claim 7, characterized in that The charge pump is used to generate a PWM waveform signal, and the PWM waveform signal is used to drive the control module.

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