Power supply circuit and power supply system
By designing voltage regulation modules and isolation modules in the power supply circuit, the problem of complex design and high cost in the existing power supply system that requires additional isolation power modules to be installed, achieving the effect of simplifying design and reducing costs.
Patent Information
- Application Number
- CN202421352582.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-05-20
- Estimated Expiration
- 2034-06-13
AI Technical Summary
Existing power supply systems require additional isolation power modules, resulting in complex design and high design costs.
A power supply circuit is designed, including a voltage regulation module and an isolation module, which converts the first voltage output by the battery into a second voltage and transmits the second voltage to the isolation module, which outputs the main supply voltage and the isolation voltage according to the second voltage.
By adding an isolation module, the main supply voltage and isolation voltage can be output according to the second voltage, avoiding the additional isolation power module, simplifying the design of the power supply system and reducing the design cost.
Smart Images
Figure CN222888014U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of power supply systems, and particularly relates to a power supply circuit and a power supply system. Background Art
[0002] In the existing power supply system, the power supply circuit uses a synchronous buck conversion chip and an inductor to convert the battery voltage into a preset voltage. One path passes through the main power supply module to supply power to the controller, and the other path outputs an isolated voltage through the isolated power supply module. Then, the isolated power supply module steps down the isolated voltage to supply power to the 485 / CAN (Controller Area Network) isolation circuit. However, such a design requires an additional isolated power supply module, resulting in a complex design of the power supply system and thus increasing the design cost of the power supply system. Summary of the Utility Model
[0003] The embodiments of this application provide a power supply circuit and a power supply system, which can solve the problem that the existing power supply system requires an additional isolated power supply module, resulting in a high design cost of the power supply system.
[0004] In a first aspect, the embodiments of this application provide a power supply circuit, including a voltage regulation module and an isolation module. The voltage regulation module is electrically connected to the isolation module. The voltage regulation module is used to be electrically connected to a battery, and the isolation module is used to be electrically connected to a main power supply module and an isolated power supply module respectively;
[0005] The voltage regulation module is used to convert a first voltage output by the battery into a second voltage and transmit the second voltage to the isolation module. The isolation module is used to output a main power supply voltage to the main power supply module according to the second voltage, and the isolation module is also used to output an isolated voltage to the isolated power supply module according to the second voltage.
[0006] In a possible implementation manner of the first aspect, the isolation module includes a transformer. A first end of a primary coil of the transformer is electrically connected to the voltage regulation module, a second end of the primary coil of the transformer is electrically connected to the voltage regulation module and the main power supply module respectively, a first end of a secondary coil of the transformer is used to be electrically connected to the isolated power supply module, and a second end of the secondary coil of the transformer is grounded.
[0007] In a possible implementation manner of the first aspect, the voltage regulation module includes a voltage regulation chip. A power supply terminal of the voltage regulation chip is electrically connected to the battery, a feedback terminal of the voltage regulation chip is electrically connected to a second end of the primary coil of the transformer, and an output terminal of the voltage regulation chip is electrically connected to a first end of the primary coil of the transformer.
[0008] In a possible implementation of the first aspect, the voltage regulation module further includes a voltage division unit. The first end of the voltage division unit is electrically connected to the second end of the primary coil of the transformer, and the second end of the voltage division unit is electrically connected to the feedback end of the voltage regulation chip;
[0009] The voltage division unit is used to divide the main supply voltage and transmit the divided voltage to the voltage regulation chip.
[0010] In a possible implementation of the first aspect, the voltage division unit includes a first resistor and a second resistor. The first end of the first resistor is electrically connected to the first end of the second resistor and the feedback end of the voltage regulation chip respectively. The second end of the first resistor is electrically connected to the second end of the primary coil of the transformer, and the second end of the second resistor is grounded.
[0011] In a possible implementation of the first aspect, the power supply circuit further includes a first filtering module and a second filtering module. The first filtering module is electrically connected to the isolation module and the main power supply module respectively, and the second filtering module is electrically connected to the isolation module and the isolated power supply module respectively;
[0012] The first filtering module is used to filter out high-frequency signals in the main supply voltage, and the second filtering module is used to filter out high-frequency signals in the isolated voltage.
[0013] In a possible implementation of the first aspect, the first filtering module includes a first capacitor and a second capacitor. The first ends of the first capacitor and the second capacitor are both electrically connected to the isolation module, and the second ends of the first capacitor and the second capacitor are both grounded.
[0014] In a possible implementation of the first aspect, the second filtering module includes a third capacitor, a fourth capacitor and a first diode. The anode of the first diode is electrically connected to the isolation module, and the second end of the first diode is electrically connected to the first end of the third capacitor, the second end of the fourth capacitor and the isolated power supply module respectively. The second ends of the third capacitor and the fourth capacitor are both grounded.
[0015] In a possible implementation of the first aspect, the power supply circuit further includes a second diode. The anode of the second diode is used to be electrically connected to the battery, and the cathode of the second diode is electrically connected to the voltage regulation module.
[0016] In a second aspect, an embodiment of the present application provides a power supply system, including a battery, a main power supply module, an isolated power supply module and the power supply circuit according to any one of the first aspect. The power supply circuit is electrically connected to the battery, the main power supply module and the isolated power supply module respectively.
[0017] The beneficial effects of the embodiments of the present application compared with the prior art are as follows:
[0018] The power supply circuit provided by the embodiments of the present application includes a voltage regulation module and an isolation module. The voltage regulation module is electrically connected to the battery, and can convert the first voltage output by the battery into a second voltage and transmit the second voltage to the isolation module. The isolation module can output a main power supply voltage to the main power supply module according to the second voltage, and the isolation module can also output an isolation voltage to the isolated power supply module according to the second voltage. It can be seen from this that the power supply circuit provided by the embodiments of the present application can output a main power supply voltage and an isolation voltage according to the second voltage by adding an isolation module. The main power supply module supplies power to the controller according to the main power supply voltage, and the isolated power supply module supplies power to the 485 / CAN isolation circuit according to the isolation voltage. Through such a design, the power supply circuit in the present application can output two different voltages, namely the main power supply voltage and the isolation voltage, according to the second voltage. In this way, an additional isolated power supply module does not need to be provided in the power supply system, thereby simplifying the design of the power supply system and reducing the design cost of the power supply system. Description of the Drawings
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0020] Figure 1 is a circuit connection schematic diagram of an existing power supply circuit;
[0021] Figure 2 is a principle block diagram of an existing power supply system;
[0022] Figure 3 is a principle block diagram of a power supply circuit provided by an embodiment of the present application;
[0023] Figure 4 is a circuit connection schematic diagram of a power supply circuit provided by an embodiment of the present application;
[0024] Figure 5 is a circuit connection schematic diagram of an existing isolated power supply module;
[0025] Figure 6 is a structural schematic diagram of an existing isolated power supply module;
[0026] Figure 7 is a principle block diagram of a power supply system provided by an embodiment of the present application;
[0027] Figure 8It is a schematic circuit connection diagram of the main power supply module provided by an embodiment of the present application;
[0028] Figure 9 It is a schematic circuit connection diagram of the isolated power supply module provided by an embodiment of the present application.
[0029] In the figure: 10, power supply circuit; 101, voltage regulation module; 1011, voltage division unit; 102, isolation module; 103, first filtering module; 104, second filtering module; 20, battery; 30, main power supply module; 40, isolated power supply module. Detailed implementation manners
[0030] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system architectures and technologies are presented to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.
[0031] It should be understood that when used in the specification and appended claims of the present application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.
[0032] It should also be understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0033] As used in the specification and appended claims of the present application, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if detecting [the described condition or event]" can be interpreted as meaning "once determined", "in response to determining", "once detecting [the described condition or event]", or "in response to detecting [the described condition or event]" depending on the context.
[0034] In addition, in the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.
[0035] References to "one embodiment" or "some embodiments" or the like described in the specification of this application mean that specific features, structures, or characteristics described in connection with that embodiment are included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc., which appear in different places in this specification, do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants mean "including but not limited to", unless otherwise specifically emphasized.
[0036] As Figure 1 and Figure 2 shown, in the existing power supply system, the power supply circuit uses a synchronous buck conversion chip U1 and an inductor L1 to convert the battery voltage into a preset voltage (such as 5V). One path passes through the main power supply module to supply power to the controller, and the other path outputs an isolated voltage (isolated 5V) through the isolated power supply module, and then the isolated power supply module steps down the isolated voltage to supply power to the 485 / CAN isolation circuit. However, such a design requires an additional isolated power supply module, resulting in a complex design of the power supply system and thus increasing the design cost of the power supply system. Among them, the main power supply module can be an LDO (Low Dropout Regulator) main power supply module, and the isolated power supply module can be an LDO isolated power supply module.
[0037] Based on the above problems, the power supply circuit provided in the embodiments of this application includes a voltage regulation module and an isolation module. The voltage regulation module is electrically connected to the battery, can convert the first voltage output by the battery into a second voltage, and transmit the second voltage to the isolation module. The isolation module can output a main power supply voltage to the main power supply module according to the second voltage, and the isolation module can also output an isolated voltage to the isolated power supply module according to the second voltage. It can be seen from this that the power supply circuit provided in the embodiments of this application can output a main power supply voltage and an isolated voltage according to the second voltage by adding an isolation module. The main power supply module supplies power to the controller according to the main power supply voltage, and the isolated power supply module supplies power to the 485 / CAN isolation circuit according to the isolated voltage. Through such a design, the power supply circuit in this application can output two different voltages, namely the main power supply voltage and the isolated voltage, according to the second voltage. In this way, an additional isolated power supply module can be omitted in the power supply system, thereby simplifying the design of the power supply system and reducing the design cost of the power supply system.
[0038] In order to illustrate the technical solutions described in this application, the following will be described through specific embodiments.
[0039] Figure 3 shows a schematic block diagram of a power supply circuit 10 provided in an embodiment of this application. Refer toFigure 3 As shown, the power supply circuit 10 includes a voltage regulation module 101 and an isolation module 102. The voltage regulation module 101 is electrically connected to the isolation module 102. The voltage regulation module 101 is used to be electrically connected to the battery 20, and the isolation module 102 is used to be electrically connected to the main power supply module 30 and the isolated power supply module 40 respectively.
[0040] Specifically, the voltage regulation module 101 is electrically connected to the battery 20, which can convert the first voltage output by the battery 20 into a second voltage and transmit the second voltage to the isolation module 102. The isolation module 102 can output a main power supply voltage to the main power supply module 30 according to the second voltage, and the isolation module 102 can also output an isolated voltage to the isolated power supply module 40 according to the second voltage. It can be seen from this that in the power supply circuit 10 provided by the embodiment of the present application, by adding the isolation module 102, the main power supply voltage and the isolated voltage can be output according to the second voltage. The main power supply module 30 powers the controller according to the main power supply voltage, and the isolated power supply module 40 powers the 485 / CAN isolation circuit according to the isolated voltage. Through such a design, the power supply circuit 10 in the present application can output two different voltages, namely the main power supply voltage and the isolated voltage, according to the second voltage. In this way, there is no need to additionally set an isolated power supply module in the power supply system, thereby simplifying the design of the power supply system and reducing the design cost of the power supply system.
[0041] In an embodiment of the present application, as Figure 4 shown, the isolation module 102 includes a transformer T1. The first end of the primary coil of the transformer T1 is electrically connected to the voltage regulation module 101, the second end of the primary coil of the transformer T1 is electrically connected to the voltage regulation module 101 and the main power supply module 30 respectively, the first end of the secondary coil of the transformer T1 is used to be electrically connected to the isolated power supply module 40, and the second end of the secondary coil of the transformer T1 is grounded.
[0042] Specifically, the voltage regulation module 101, the primary coil of the transformer T1 and the main power supply module 30 form a power supply loop, and the voltage regulation module 101 outputs the main power supply voltage to the main power supply module 30 through the primary coil of the transformer T1. At this time, since current passes through the primary coil of the transformer T1, it generates a magnetic field in the coil. The magnetic field induces an electromotive force in the secondary coil of the transformer T1. Therefore, the secondary coil of the transformer T1 will couple out an isolated voltage.
[0043] It should be noted that the circuit connection schematic diagram of the isolated power supply module in the existing power supply system is as Figure 5 shown, and the structural schematic diagram of the isolated power supply module in the existing power supply system is as Figure 6 shown. Figure 6 In (a) is the front view of the isolated power supply module, Figure 6Figure (b) is the bottom view of the isolated power supply module. Among them, 1, 2, 3, and 4 are the four pins of the isolated power supply module. Pin 1 is GND, pin 2 is Vin, pin 3 is 0V, and pin 4 is +V 0 , Figure 6 Figure (c) shows the relative positional relationship of the four pins, and the distance between adjacent two pins is 2.54 mm. Figure 6 The dimension unit in this figure is mm. The tolerance of the terminal cross-section is ±0.1 [±0.004], and the tolerance without marking is ±0.25 [±0.010]. The isolated power supply module is generally plastic encapsulated, with a circuit board inside, assembled with the main board, and cannot be surface-mounted, but needs to be soldered later. In this application, the transformer T1 is used as the isolation module 102. The transformer T1 is made of ferrite material, can be surface-mounted and assembled, without manual soldering, which is convenient for the assembly of the whole board.
[0044] In an embodiment of the present application, as Figure 4 shown, the voltage regulation module 101 includes a voltage regulation chip U1. The power supply terminal of the voltage regulation chip U1 is electrically connected to the battery 20. The feedback terminal of the voltage regulation chip U1 is electrically connected to the second end of the primary coil of the transformer T1. The output terminal of the voltage regulation chip U1 is electrically connected to the first end of the primary coil of the transformer T1.
[0045] Specifically, pin 1 of the voltage regulation chip U1 is the GND grounding pin for grounding. Pin 2 of the voltage regulation chip U1 is the IN power input pin for electrically connecting to the battery 20 and can receive the first voltage output by the battery 20. Pin 3 of the voltage regulation chip U1 is the EN enable pin for controlling the working state of the voltage regulation chip U1. Pin 4 of the voltage regulation chip U1 is the RON conduction resistance R3 pin of the switching transistor for setting the conduction resistance value of the switching transistor inside the chip, which affects the frequency and efficiency of the switching operation. Pin 5 of the voltage regulation chip U1 is the FB feedback pin for receiving the feedback signal from the second end of the primary coil of the transformer T1 to adjust the output voltage of the voltage regulation chip U1. Pin 6 of the voltage regulation chip U1 is the PG power good pin for indicating whether the power output is stable and normal, and is also used for the reset function of the voltage regulation chip U1. Pin 7 of the voltage regulation chip U1 is the BS start pin for providing a start voltage to help the voltage regulation chip U1 establish a working state in the initial stage. Pin 8 of the voltage regulation chip U1 is the LX output pin connected to the first end of the primary coil of the transformer T1 for the transmission of voltage conversion. Pin 9 of the voltage regulation chip U1 is the GND2 grounding pin for grounding.
[0046] Exemplarily, the model of the voltage regulation chip U1 can be selected as SY8501FCC, which is used in DC-DC converters or switch-mode power supplies (SMPS). SY8501FCC is a monolithic buck switch regulator based on constant on-time control for fast transient response. It operates within an input voltage range of 6V to 100V and can provide a continuous output current of 0.6A integrated MOSFET. The constant on-time control mode provides tight load transient response and cycle-by-cycle current limiting. In light load conditions, it operates at low frequencies to maintain high efficiency, while in continuous current mode to achieve frequency-sensitive applications. Combining with the transformer T1 can output an isolated voltage of 5V.
[0047] It should be noted that the voltage regulation chip U1 is internally provided with a controller and a switch. The controller is used to control the opening and closing of the switch inside the voltage regulation chip U1 through PWM signals to achieve voltage conversion, and the switch is used to control the flow of current. Specifically, when the controller sends a high-level PWM signal, the switch conducts, and the current can flow through the primary winding; when the controller sends a low-level PWM signal, the switch turns off, and the current stops flowing. By adjusting the frequency and duty cycle of the PWM signal, the magnitude of the output voltage (the second voltage) can be controlled. This switching control method can improve the efficiency and stability of the power supply while reducing electromagnetic interference.
[0048] In an embodiment of the present application, as Figure 4 shown, the voltage regulation module 101 further includes a voltage division unit 1011. The first end of the voltage division unit 1011 is electrically connected to the second end of the primary coil of the transformer T1, and the second end of the voltage division unit 1011 is electrically connected to the feedback end of the voltage regulation chip U1.
[0049] Specifically, the voltage division unit 1011 is connected between the second end of the primary coil of the transformer T1 and the FB feedback pin of the voltage regulation chip U1, which can divide the main supply voltage output from the second end of the primary coil of the transformer T1 and transmit the divided voltage to the FB feedback pin of the voltage regulation chip U1. The controller inside the voltage regulation chip U1 detects the voltage output by the voltage division unit 1011 and compares it with the reference voltage, and adjusts the duty cycle of the PWM signal through closed-loop control, thereby precisely controlling the stability of the main supply voltage at the second end of the primary coil of the transformer T1.
[0050] In an embodiment of the present application, as Figure 4 shown, the voltage division unit 1011 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the feedback end of the voltage regulation chip U1 respectively. The second end of the first resistor R1 is electrically connected to the second end of the primary coil of the transformer T1, and the second end of the second resistor R2 is grounded.
[0051] Specifically, the first resistor R1 and the second resistor R2 are both used for voltage division and transmit the divided voltage to the FB feedback pin of the voltage regulation chip U1. The controller inside the voltage regulation chip U1 detects the voltage output by the voltage division unit 1011, compares it with the reference voltage, and adjusts the duty cycle of the PWM signal through closed-loop control, thereby precisely controlling the stability of the main supply voltage at the second end of the primary coil of the transformer T1.
[0052] In an embodiment of the present application, as Figure 4 shown, the power supply circuit 10 further includes a first filtering module 103 and a second filtering module 104. The first filtering module 103 is electrically connected to the isolation module 102 and the main power supply module 30 respectively, and the second filtering module 104 is electrically connected to the isolation module 102 and the isolated power supply module 40 respectively.
[0053] Specifically, the first filtering module 103 is connected between the isolation module 102 and the main power supply module 30, and is mainly used to filter out high-frequency signals in the main supply voltage. By filtering out these high-frequency noise signals, the first filtering module 103 helps protect the electronic device from interference and improves the stability and reliability of the power supply circuit 10. The second filtering module 104 is connected between the isolation module 102 and the isolated power supply module 40, and is mainly used to filter out high-frequency signals in the isolated voltage. By filtering out these high-frequency noise signals, the second filtering module 104 can ensure the normal operation of the power supply circuit 10.
[0054] In an embodiment of the present application, as Figure 4 shown, the first filtering module 103 includes a first capacitor C1 and a second capacitor C2. The first ends of the first capacitor C1 and the second capacitor C2 are both electrically connected to the isolation module 102, and the second ends of the first capacitor C1 and the second capacitor C2 are both grounded.
[0055] Specifically, both the first capacitor C1 and the second capacitor C2 have the function of passing high-frequency signals and blocking low-frequency signals, and can filter out high-frequency signals in the main supply voltage. By filtering out these high-frequency noise signals, it helps protect the electronic device from interference and improves the stability and reliability of the power supply circuit 10. As Figure 4 shown, the first filtering module 103 may further include a fifth capacitor C5 and a sixth capacitor C6. The functions of the fifth capacitor C5 and the sixth capacitor C6 are the same as those of the first capacitor C1 and the second capacitor C2.
[0056] Exemplarily, the number of capacitors in the first filtering module 103 is not limited. Designers can select the number of capacitors in the first filtering module 103 according to the actual situation. Designers can also select the capacitance value of the capacitors in the first filtering module 103 according to the actual situation. For example, a capacitor with a large capacitance value can be selected to replace the first capacitor C1, the second capacitor C2, the fifth capacitor C5, and the sixth capacitor C6. Alternatively, multiple capacitors with small capacitance values and low costs can be selected to replace the first capacitor C1, the second capacitor C2, the fifth capacitor C5, and the sixth capacitor C6.
[0057] In an embodiment of the present application, as Figure 4 shown, the second filtering module 104 includes a third capacitor C3, a fourth capacitor C4, and a first diode D1. The anode of the first diode D1 is electrically connected to the isolation module 102. The second end of the first diode D1 is respectively electrically connected to the first end of the third capacitor C3, the second end of the fourth capacitor C4, and the isolation power supply module 40. The second ends of the third capacitor C3 and the fourth capacitor C4 are both grounded.
[0058] Specifically, the first diode D1 is used for rectification. Both the third capacitor C3 and the fourth capacitor C4 have the function of passing high-frequency signals and blocking low-frequency signals, and can filter out high-frequency signals in the isolation voltage. By filtering out these high-frequency noise signals, the normal operation of the power supply circuit 10 can be ensured. As Figure 4 shown, the second filtering module 104 may further include a seventh capacitor C7. The function of the seventh capacitor C7 is the same as that of the third capacitor C3 and the fourth capacitor C4.
[0059] Exemplarily, the number of capacitors in the second filtering module 104 is not limited. Designers can select the number of capacitors in the second filtering module 104 according to the actual situation. Designers can also select the capacitance value of the capacitors in the second filtering module 104 according to the actual situation. For example, a capacitor with a large capacitance value can be selected to replace the third capacitor C3, the fourth capacitor C4, and the seventh capacitor C7. Alternatively, multiple capacitors with small capacitance values and low costs can be selected to replace the third capacitor C3, the fourth capacitor C4, and the seventh capacitor C7.
[0060] In an embodiment of the present application, as Figure 4 shown, the power supply circuit 10 further includes a second diode D2. The anode of the second diode D2 is used to be electrically connected to the battery 20, and the cathode of the second diode D2 is electrically connected to the voltage regulation module 101.
[0061] Specifically, the second diode D2 is used to prevent reverse connection. If the battery 20 is connected incorrectly, the second diode D2 can prevent the current from flowing in the reverse direction, protecting the voltage regulation chip U1 and the subsequent circuit from being damaged by the reverse voltage.
[0062] As Figure 7As shown in the figure, the present application also discloses a power supply system, which includes a battery 20, a main power supply module 30, an isolated power supply module 40, and the above-mentioned power supply circuit 10. The power supply circuit 10 is electrically connected to the battery 20, the main power supply module 30, and the isolated power supply module 40 respectively. By adopting the above-mentioned power supply circuit 10 in the power supply system, it is possible to avoid additionally setting up an isolated power supply module, thereby simplifying the design of the power supply system and reducing the design cost of the power supply system. Among them, the circuit connection schematic diagram of the main power supply module 30 is as Figure 8 shown, and the circuit connection schematic diagram of the isolation module 102 is as Figure 9 shown.
[0063] In an embodiment of the present application, as Figure 8 shown, the power supply system further includes a controller, a voltage and current acquisition chip, a current detection circuit, a discharge MOS switch group, a charging MOS switch group, and a 485 / CAN isolation circuit. Among them, the voltage and current acquisition chip can monitor the voltage and current status of the power supply system in real time, and convert the detected analog signal into a digital signal for the controller to process. The controller can be a CPU processor, which is used to communicate with the voltage and current acquisition chip through I2C. The controller receives data from the voltage and current acquisition chip and the current detection circuit, and makes corresponding control decisions based on these data. The current detection circuit is used to monitor the current flowing through the discharge MOS switch group and the charging MOS switch group. The discharge MOS switch group is responsible for transferring the electrical energy of the battery 20 to the load in the power supply system. The charging MOS switch group is responsible for controlling the charging process of the battery 20 in the power supply system. The 485 / CAN isolation circuit is used to realize the communication between the power supply system and other electronic systems.
[0064] Since the processing and functions implemented by the power supply system in this embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing power supply circuit, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments, and details will not be repeated here.
[0065] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.
Claims
1. A power supply circuit, characterized in that: It includes a voltage regulating module and an isolation module, the voltage regulating module is electrically connected to the isolation module, the voltage regulating module is used to be electrically connected to the battery, and the isolation module is used to be electrically connected to the main power supply module and the isolation power supply module respectively; The voltage regulating module is used to convert the first voltage output by the battery into a second voltage and transmit the second voltage to the isolation module. The isolation module is used to output the main power supply voltage to the main power supply module according to the second voltage. The isolation module is also used to output the isolation voltage to the isolation power supply module according to the second voltage.
2. The power supply circuit according to claim 1, characterized in that: The isolation module includes a transformer, a first end of the primary coil of the transformer is electrically connected to the voltage regulation module, a second end of the primary coil of the transformer is electrically connected to the voltage regulation module and the main power supply module respectively, a first end of the secondary coil of the transformer is used to be electrically connected to the isolation power supply module, and a second end of the secondary coil of the transformer is grounded.
3. The power supply circuit according to claim 2, characterized in that: The voltage regulating module includes a voltage regulating chip, a power supply end of the voltage regulating chip is electrically connected to the battery, a feedback end of the voltage regulating chip is electrically connected to the second end of the primary coil of the transformer, and an output end of the voltage regulating chip is electrically connected to the first end of the primary coil of the transformer.
4. The power supply circuit according to claim 3, characterized in that: The voltage regulating module further comprises a voltage dividing unit, a first end of the voltage dividing unit is electrically connected to the second end of the primary coil of the transformer, and a second end of the voltage dividing unit is electrically connected to the feedback end of the voltage regulating chip; The voltage dividing unit is used to divide the main power supply voltage and transmit the divided voltage to the voltage regulating chip.
5. The power supply circuit according to claim 4, characterized in that: The voltage dividing unit includes a first resistor and a second resistor, the first end of the first resistor is electrically connected to the first end of the second resistor and the feedback end of the voltage regulating chip respectively, the second end of the first resistor is electrically connected to the second end of the primary coil of the transformer, and the second end of the second resistor is grounded.
6. The power supply circuit according to any one of claims 1 to 5, characterized in that: The power supply circuit further includes a first filter module and a second filter module, the first filter module is electrically connected to the isolation module and the main power supply module respectively, and the second filter module is electrically connected to the isolation module and the isolation power supply module respectively; The first filtering module is used to filter out high-frequency signals in the main power supply voltage, and the second filtering module is used to filter out high-frequency signals in the isolation voltage.
7. The power supply circuit according to claim 6, characterized in that: The first filtering module includes a first capacitor and a second capacitor. The first end of the first capacitor and the first end of the second capacitor are both electrically connected to the isolation module, and the second end of the first capacitor and the second end of the second capacitor are both grounded.
8. The power supply circuit according to claim 6, characterized in that: The second filtering module includes a third capacitor, a fourth capacitor and a first diode, the anode of the first diode is electrically connected to the isolation module, the second end of the first diode is electrically connected to the first end of the third capacitor, the second end of the fourth capacitor and the isolation power supply module, respectively, and the second end of the third capacitor and the second end of the fourth capacitor are both grounded.
9. The power supply circuit according to any one of claims 1 to 5, characterized in that: The power supply circuit also includes a second diode, an anode of the second diode is used to be electrically connected to a battery, and a cathode of the second diode is electrically connected to the voltage regulation module.
10. A power supply system, characterized in that: It comprises a battery, a main power supply module, an isolated power supply module and a power supply circuit according to any one of claims 1 to 9, wherein the power supply circuit is electrically connected to the battery, the main power supply module and the isolated power supply module respectively.