Power supply main control board and power supply system

Abstract

The utility model discloses a power supply main control board and a power supply management system, and relates to the technical field of power supply control, the main control board comprises a first voltage unit, a power supply anode is connected with an input end of a step-down converter through a Schottky diode, an output end of the step-down converter is connected with an inductor, and stable voltage is output through a group of filter capacitors; a feedback pin of the step-down converter is connected to the resistance voltage division circuit and is used for adjusting the output voltage; a first enable signal is connected to the base electrode of the first transistor through the resistor; a collector electrode of the first transistor is connected to a grid electrode of the first field effect transistor through a resistor; the input end of the first voltage-stabilizing unit is connected with the output end of the first voltage unit; the first voltage unit receives output voltage of the first voltage unit and converts the output voltage into second voltage; the input end of the second voltage stabilizing unit is connected with the output end of the first voltage stabilizing unit, the second voltage is converted into the third voltage, various stable and reliable power supplies meeting different voltage requirements can be provided, and stable operation of equipment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to power control technical field especially relates to a power main control board and power system. BACKGROUND

[0002] In recent years, the portable energy storage power bank market presents a vigorous development trend. With the popularity of outdoor activities such as camping, hiking, and field photography, people's demand for reliable power supply in environments away from traditional power sources has grown rapidly. At the same time, in areas prone to natural disasters and areas with unstable power supply, portable energy storage power banks play an important role in ensuring basic living electricity and critical equipment operation as emergency backup power sources.

[0003] From a technical point of view, the performance of the power main control board, the core component of the portable energy storage power bank, is crucial. Traditional power management technology cannot meet the current diverse power needs. For example, modern electronic devices are diverse, including smartphones, tablets, drones, outdoor lighting devices, and portable radios, each with different requirements for input voltage, current, and power stability. This requires the power main control board to have flexible and precise voltage conversion and regulation capabilities to output multiple stable voltages such as 12V, 5V, and 3.3V to adapt to different devices.

[0004] In addition, to improve energy utilization efficiency and the safety of the power system, low dropout (LDO) voltage regulator technology is widely used in portable energy storage power banks. However, to adapt to more complex application scenarios, such as when the power bank powers devices like radios, not only must stable power supply be ensured, but also intelligent control of the power source must be implemented, including switching control, AC voltage conversion, and signal transmission and interaction. Therefore, developing a more comprehensive, higher-integrated, and more precise power main control board and power system is key to promoting the development of portable energy storage power banks and meeting users' diverse and personalized needs. Utility model content

[0005] The utility model aims at providing a kind of power main control board and power system, multiple function circuits are integrated in power main control board, and constitute power system, can provide multiple stable, reliable and adapt to different voltage demand power supply, ensure that equipment stable operation, it is convenient to apply in portable energy storage power bank and other equipment.

[0006] The utility model aims at using following technical scheme realization:

[0007] Firstly, the present application provides a kind of power main control board, comprising:

[0008] LDO power management module;The LDO power management module comprises:

[0009] The first voltage unit is connected to the input end of the voltage converter through a diode connected to the positive electrode of the power supply, and the output end of the voltage converter is connected to an inductor, and then a stable voltage is output through a set of filter capacitors; the feedback pin of the voltage converter is connected to a resistor voltage dividing circuit for adjusting the output voltage; the first enable signal is connected to the base of the first transistor through a resistor; the collector of the first transistor is connected to the gate of the first field effect transistor through a resistor;

[0010] The first voltage stabilizing unit is connected to the output end of the first voltage unit; receives the output voltage of the first voltage unit and converts it into a second voltage;

[0011] The second voltage stabilizing unit is connected to the output end of the first voltage stabilizing unit and converts the second voltage into a third voltage.

[0012] Preferably, the first voltage unit outputs a 12V voltage; the first voltage stabilizing unit outputs a 5V voltage; and the second voltage stabilizing unit outputs a 3.3V voltage.

[0013] Preferably, the first voltage stabilizing unit comprises a first chip, and the output voltage of the first voltage unit is connected to the input end of the first chip through a resistor and a filter capacitor in sequence, and the output end of the first chip outputs the second voltage through a filter capacitor.

[0014] Preferably, the second voltage stabilizing unit comprises a second chip, and the output voltage of the first voltage stabilizing unit is connected to the input end of the second chip through a resistor and a filter capacitor in sequence, and the output end of the second chip outputs the third voltage through a filter capacitor.

[0015] Preferably, the LDO power management module further comprises a first control circuit comprising a second transistor and a third transistor, the second enable signal is connected to the second transistor through a resistor to control the output of the second voltage; and the third enable signal is connected to the third transistor through a resistor to control the output of the third voltage.

[0016] Preferably, the LDO power management module further comprises a second control circuit comprising:

[0017] The fourth enable signal is connected to the base of the fourth transistor through a resistor, and the base of the fourth transistor is also connected to the ground through a resistor; the drain of the second field effect transistor is connected to the output voltage of the first voltage stabilizing unit, the source of the second field effect transistor is connected to the input end of the isolation power supply device, the collector of the fourth transistor is connected to the gate of the second field effect transistor, the OUT end of the isolation power supply device outputs a first alternating voltage, and the input and output ends of the isolation power supply device are respectively connected to the ground through capacitors.

[0018] Preferably, the LDO power management module further comprises a third control circuit comprising:

[0019] The output signal of the third voltage is used as input. The voltage after passing through the diode and resistor is connected to the control terminal of the reference source chip. The output terminal of the reference source chip is connected to a parallel capacitor for filtering.

[0020] Preferably, the power supply main control board further includes a radio power control module, the radio power control module including a fourth control circuit, comprising:

[0021] The positive terminal of the battery is connected to the source of the third field-effect transistor, and the voltage is divided by a voltage divider resistor; the fourth enable signal is connected to the base of the fifth transistor through a resistor, the emitter of the fifth transistor is grounded, and the collector of the fifth transistor is connected to the gate of the third field-effect transistor.

[0022] The output of the third field-effect transistor is filtered by a set of capacitors and then input to the input terminal of the power conversion chip. The output terminal of the power conversion chip is connected to an inductor and a filter capacitor, and then connected to a surface mount connector.

[0023] Preferably, the radio power control module further includes a transmission and interface circuit, comprising:

[0024] Multiple signals are input through a zero-resistance connector, through which they are transmitted to or received from external devices.

[0025] Secondly, this application provides a power supply system, including any of the power supply main control boards described in this application.

[0026] Compared with the prior art, the utility model discloses at least including: through the synergistic effect of first voltage unit, first voltage stabilizing unit and second voltage stabilizing unit, can output 12V, 5V, 3.3V etc. Variety stable voltage, satisfy the power supply demand of different electronic equipment diversification, can be widely adapted from the fan equipment of higher voltage requirement to the chip of voltage sensitivity different type load, the feedback pin connection resistance voltage dividing circuit of step-down converter, can accurately adjust output voltage, simultaneously multiple enable signal is connected to corresponding transistor respectively, realizes the accurate control of different voltage output, can open or close voltage output in time when needing, guarantees the normal operation of equipment again, and improved energy utilization efficiency. Second control circuit can utilize isolation power device and convert direct current voltage into first alternating voltage, widened the application scene of power main control board, makes it can supply power for some need ac power equipment. Third control circuit passes through reference source chip and filter capacitor, can output stable reference voltage, provides reliable reference voltage for other parts in circuit, helps to improve the stability and accuracy of whole circuit. The fourth control circuit in radio power control module can realize the switch control of radio power and voltage conversion and filtering, cooperates transmission and interface circuit, not only can for radio stable power supply, can also realize the signal transmission and interaction between external equipment, improves the power management and function support ability of specific equipment. Multiple function circuits are integrated in power main control board, and constitute power system, make the whole structure compact, reduced the complexity of external component, improved the reliability and stability of system, convenient in portable energy storage mobile power equipment and so on application. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the power main control board structure schematic diagram of the utility model embodiment.

[0028] Figure 2 It is the first voltage unit structure schematic diagram of the utility model embodiment;

[0029] Figure 3 It is the first voltage stabilizing unit structure schematic diagram of the utility model embodiment;

[0030] Figure 4 It is the second voltage stabilizing unit structure schematic diagram of the utility model embodiment;

[0031] Figure 5 It is the first control circuit structure schematic diagram of the utility model embodiment;

[0032] Figure 6 It is the second control circuit structure schematic diagram of the utility model embodiment;

[0033] Figure 7 It is the third control circuit structure schematic diagram of the utility model embodiment;

[0034] Figure 8 is a fourth control circuit structure schematic diagram of an embodiment of the utility model;

[0035] Figure 9 is a transmission and interface circuit structure schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0036] Example implementations are now described with reference to the drawings. Example implementations can, however, be carried out in various ways, and should not be considered to be limited to those described herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. Identical reference numerals have been used, where possible, to designate corresponding elements throughout the figures, and a detailed description of the same will not be repeated.

[0037] It should be noted that the embodiments described below are exemplary only, and are used to explain the present application, and should not be understood as a limitation of the present application, and the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, the present application covers any alternative, modification, equivalent method and scheme within the spirit, principle and scope of the present application defined by the claims, and all other embodiments obtained by those skilled in the art without creative labor, which are within the scope of protection of the present application.

[0038] In the description of the present application, "first", "second", "third" and similar words do not represent any order, quantity or importance, but are used to distinguish different components. Similarly, "one" or "a" and similar words do not represent a quantity limit, but represent the existence of at least one. "Include" or "contain" and similar words mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect.

[0039] The words expressing position and direction described in the present application are explained by taking the drawings as an example, but changes can also be made as needed, and the changes made are all within the scope of protection of the present application.

[0040] Example 1: refer to the drawings Figures 1-4 A power supply main control board, comprising:

[0041] An LDO power management module; the LDO power management module comprises:

[0042] The first voltage unit is connected with the positive electrode of the power supply and the input end of the voltage converter through a Schottky diode, the output end of the voltage converter is connected with an inductor, and then a stable voltage is output through a group of filter capacitors; the feedback pin of the voltage converter is connected to a resistance voltage dividing circuit for adjusting the output voltage; the first enable signal is connected to the base of the first transistor through a resistance; the collector of the first transistor is connected to the gate of the first field effect transistor through a resistance;

[0043] The first voltage stabilizing unit is connected with the output end of the first voltage unit; receives the output voltage of the first voltage unit and converts it into a second voltage; a first chip U10 (MD7612C50-SOT223) is used to convert the output voltage of the first voltage unit into 5V (5V_LDO). The input +12V is first filtered through a resistance R116, and then filtered through capacitors C81 and C82 before entering the chip, and the output end is also filtered through capacitors C83 and C84 to ensure stable output.

[0044] The second voltage stabilizing unit is connected with the output end of the first voltage stabilizing unit and converts the second voltage into a third voltage; a second chip U11 (MD7612C33-SOT223) is used to convert the 5V output voltage of the first voltage stabilizing unit into 3.3V (A3.3V). The input LDO_IN is first filtered through a resistance R124, and then filtered through capacitors C86 and C87 before entering the chip, and the output end is filtered through C88, C89 and C85 to output stable 3.3V.

[0045] The specific working principle is as follows:

[0046] In the first voltage unit, the positive electrode of the battery (BAT+) is connected with an anti-reverse diode, i.e. a Schottky diode D6 (SS210), to prevent damage to the circuit when the power polarity is reversed. The voltage after D6 is connected to multiple filter capacitors, such as C78 (100μF / 35V) and C77 (100nF / 50V), to filter out high and low frequency noise and make the input voltage more stable; R117 mainly sets the chip enable state threshold between the EN pin of MK9019 chip and ground;

[0047] The stabilized voltage is input to the input end (VIN pin, pin 3) of the voltage converter chip U9 (MK9019SO8). The connections and functions of other pins of the chip include:

[0048] The GND pin (pins 1, 2, 8) is connected to ground to provide a reference potential for the chip.

[0049] The EN pin (pin 4) is an enable pin, which is connected to the pin through resistance R120 (200K) and R117 (2.2M) voltage division, and at the same time, a capacitor C80 (100nF / 50V) is connected to the ground, which is used to set the enable state of the chip and stabilize the voltage of the pin.

[0050] The RT pin (pin 7) is not connected (NC).

[0051] The BOOT pin (pin 6) is connected to the ground through a capacitor C73 (100nF / 50V), which is used to drive the external power tube.

[0052] The PG pin (pin 5) outputs a power good signal, and no other components are connected here.

[0053] The FB pin (feedback pin) is connected to a voltage division circuit composed of resistors R118 (510K1%) and R123 (56K1%), which samples and feeds back the output voltage to adjust the stable voltage output by the chip.

[0054] The switch signal output from the SW pin (pin 7) of the chip U9 is connected to an inductor L5 (22μH0630), and an LC filter circuit composed of capacitors C74 (100μF / 25V), C75 (100nF / 50V), and C76 (22μF / 25V) is used to convert the switch signal into a stable DC voltage, and output 12V_VDD.

[0055] In terms of voltage output and voltage division, after the +12V_VDD input is divided into two paths; one is directly used as +12V_FAN output to power the fan; the other is connected to a voltage division circuit composed of resistors R118 and R123, and a capacitor C79 is also connected to the middle node of R118 and R123 for feedback voltage filtering; the output voltage is fed back to the feedback pin (FB pin) of the step-down converter (U9) after voltage division, thereby adjusting the stability of the output voltage.

[0056] In the enable control and switch control part, the first enable signal (12V_EN) is connected to the base of the first transistor (Q16) through the resistor R122, and the emitter of Q16 is grounded. When 12V_EN is high, Q16 is turned on, causing the gate potential of the field effect transistor Q15 (3407SOT-23) to change, Q15 is turned on, and +12V_ON / OFF has voltage output; when 12V_EN is low, Q16 is cut off, Q15 is also cut off, and +12V_ON / OFF has no output. Among them, the first field effect transistor Q15 acts as a switching element, with its source connected to +12V input and its drain outputting the +12V_ON / OFF signal. Resistor R115 is connected between the gate and source of Q15, serving to stabilize the gate voltage; resistor R119 is connected between the gate of Q15 and the collector of transistor Q16. Q15 (3407SOT-23) and Q16 (7002SOT-23) are used to control the switching of the 12V output; R115 (51kΩ) and R119 (1kΩ) are used to set the gate voltage of Q15 and control the switching state of Q15; R122 (1kΩ): used to set the gate voltage of Q16 and control the switching state of Q16.

[0057] The first enable signal provides appropriate working conditions for Q16 through the enable pin and resistor R122 (1kΩ), which is used to set the gate voltage of Q16 and control the switching state of Q16; capacitor C80 serves to filter and stabilize, preventing the enable signal from being disturbed. In addition, one end of resistor R122 is connected to the first enable signal line near the base of Q16, and the other end is connected to the base of Q16, which is used to control the conduction and cutoff of Q16, and further controls the working state of the subsequent circuit such as Q15 through Q16, realizing the control of the entire circuit enablement.

[0058] The input higher voltage is converted to a stable 12V output voltage by the first voltage unit, and the output of the 12V power supply is controlled by Q15. The buck converter controls the charging and discharging process of inductance and capacitance by adjusting the switching frequency and duty cycle, thereby realizing voltage conversion and stabilization. Q15 is used to control the switching of the 12V output, realizing flexible management of the power supply.

[0059] The first voltage stabilizing unit uses chip U10 (MD7612C50-SOT223), with its input end connected to the +12V voltage output by the first voltage unit. The input +12V first passes through resistor R116, then through capacitors C81, C82, etc. for filtering before entering chip U10. Chip U10 converts the input voltage to 5V (5V_LDO), and at the output end there are also capacitors C83, C84 for filtering to ensure the stability of the output 5V voltage, providing a stable power supply for circuit modules that require a 5V power supply.

[0060] The second voltage stabilizing power supply input end is connected with the 5V voltage output by the first voltage stabilizing unit, and a second chip U11 (MD7612C33-SOT223) is used. The input 5V (LDO IN) is first filtered by the resistor R124, and then enters the chip U11 through the capacitors C86 and C87, and the chip U11 converts the 5V voltage into 3.3V (A3.3V). The output end is filtered by C88, C89 and C85, and then outputs a stable 3.3V voltage, which is used to supply power for the circuit elements or modules with a power supply requirement of 3.3V.

[0061] Embodiment 2: refer to the attached Figures 1-7 , in addition to including all the structures of embodiment 1, the LDO power management module further comprises:

[0062] The first control circuit comprises a second transistor Q17, a third transistor Q18 and a fourth transistor Q19. The second enable signal is connected to the second transistor Q17 through a resistor, and controls the output of the 5.0V voltage (the second voltage). Specifically, the 5.0V voltage is connected to Q17 through the resistor R125, the gate of Q17 is connected to the ground through the resistor R126, and the drain outputs the 5.0V / ON signal. The third enable signal (3.3V_EN) is connected to the third transistor Q18 through a resistor, and controls the output of the 3.3V voltage (the third voltage). The A3.3V voltage is connected to the source of Q18, the gate of Q18 is connected to the enable signal and the resistor R128, the drain outputs the 3.3V / ON signal, and the drain is connected to the base of Q19 through the resistor R127. The emitter of Q19 is connected to the ground, and the collector of Q19 is connected to the drain of Q17, to cooperatively control the voltage output.

[0063] The second control circuit comprises: the fourth enable signal (5V_AC_EN) is connected to the base of the transistor Q9 (2N7002) through the resistor R208, and the base of Q9 is also connected to the ground through R210. The drain of the field effect transistor Q8 (SIE3407) is connected to 5.0V, the source is connected to the VIN end of the isolation power module U14 (B0505S-1W), and the collector of Q9 is connected to the gate of Q8. The OUT end of U14 outputs +5V_AC, and the input and output ends are connected to the capacitors C120 and C121 to the ground, respectively.

[0064] The third control circuit comprises: the output signal of the third voltage as the input, the voltage after the diode and the resistor is connected to the control end of the reference source chip, and the output end of the reference source chip is connected to the parallel capacitors for filtering.

[0065] The working principle of the first control circuit is as follows:

[0066] The NPN type transistors (Q17 and Q18) are used in the first control circuit to control the enable of the power supply.

[0067] The second enable signal (5.0V / ON) is connected to the base of the second transistor (Q17) through a resistor (R126) to control the output of the 5V power supply. The 5.0V power supply is connected to the gate of Q17 through R125 resistor. When the 5.0V / ON signal is high, the gate voltage of Q17 is lowered, making it conductive, thereby controlling the load or circuit connected between the collector and the emitter. Allow current to flow to 5.0V_ON, enable 5V power supply. C90 capacitor is used for filtering to reduce voltage ripple.

[0068] The third enable signal (3.3V_EN) is connected to the base of the third transistor (Q18) through a resistor (R128) to control the output of the 3.3V power supply; when the 3.3V_EN signal is high, Q18 is turned on, allowing current to flow, thereby controlling the load or circuit connected between the collector and the emitter. Q19 is a PNP transistor that acts as a switch in the circuit to control the output of the power supply. The base of Q19 is connected to the collector of Q18 through R127, and when Q18 is turned on, the base voltage of Q19 is lowered, making Q19 conductive, thereby allowing current to flow to 3.3V_EN, fully enabling the 3.3V power supply.

[0069] The main control circuit board (such as MCU) can enable or disable these power supplies through control signals to achieve power management.

[0070] The working principle of the second control circuit is as follows:

[0071] The enable signal 5V_AC_EN is connected to the base of transistor Q9 (2N7002) through resistor R208, and the Q9 base is also connected to ground through resistor R210. When 5V_AC_EN is high, current flows through R208 to the base of Q9, making Q9 conductive; when it is low, Q9 is cut off.

[0072] When transistor Q9 is turned on, it will pull down the gate potential of field effect transistor Q8 (SIE3407). The 5.0V voltage is connected to the drain of Q8 through resistor R207, and the source is connected to the input end VIN of isolation power supply module U14 (B0505S-1W). When Q9 is turned on and the gate potential of Q8 is pulled down, Q8 is turned on, and 5.0V voltage can be supplied to the input end of U14; if Q9 is cut off, Q8 is also cut off, and 5.0V cannot reach U14.

[0073] The isolation power module U14 (B0505S-1W) converts the input 5.0V voltage to output +5V_AC voltage. The capacitor C120 (10uF / 25V) is connected between the input pin VIN of U14 and the ground, for filtering the high-frequency noise of the input voltage; the capacitor C121 (10uF / 25V) is connected between the output pin OUT of U14 and the ground (GND_AC), for filtering the output voltage to ensure the stability of the output voltage.

[0074] The working principle of the third control circuit is as follows:

[0075] The input part: 3.3V / ON signal as input, first through diode D7 (1N5819), which prevents the reverse flow of voltage and protects the rear-end circuit. Then connect the resistor R130 (100R), which plays a current limiting role to avoid damage to the circuit components caused by excessive current.

[0076] The voltage after R130 is connected to the control end of TL431, and TL431 will output a stable voltage of 2.5V according to the characteristics of the internal circuit.

[0077] The filter part: capacitors C91 (2.2uF / 25V) and C92 (100nF / 50V) are connected in parallel between the 2.5V output end and the ground, which plays a filtering role to remove high-frequency and low-frequency noise in the output voltage, making the output reference voltage VREF+ more stable and smooth.

[0078] The positive electrode of the battery is connected to the source electrode of the third field effect transistor Q39 (PED3008MA), which is divided by R197 and R198; the fourth enable signal FM_EN is connected to the base electrode of the fifth transistor Q44 (2N7002) through resistor R199, the emitter electrode of Q44 is connected to the ground, and the collector electrode is connected to the gate electrode of Q39. The output of Q39 is filtered by C108, C114 and C111, and then input to the Vin end of the power conversion chip U7 (TMI2282L). The pins of U7 are connected to the corresponding resistors and other components according to the setting, and then FM5.0V Audio is output through the SMD connector CON6 after being filtered by L10, C115 and C118.

[0079] Example 3: refer to the attached Figures 1-9 , in addition to including the structure of example 1 or example 2, it also includes a radio power control module, the radio power control module includes a fourth control circuit and a transmission and interface circuit;

[0080] The fourth control circuit includes:

[0081] The positive pole of the battery is connected to the source of the third field effect transistor Q39 (PED3008MA), and is divided by resistors R197 (51K) and R198 (20K); the fourth enable signal FM_EN is connected to the base of the fifth transistor Q44 (2N7002) through resistor R199, the emitter of Q44 is connected to ground, and the collector is connected to the gate of Q39; the output of Q39 is filtered by a group of capacitors C108, C114, and C111, and then input to the Vin terminal of the power conversion chip U7 (TMI2282L); the output terminal of U7 is connected to inductor L10 and filter capacitors C115 and C118, and then connected to the 2-pin horizontal surface mount connector CON6 with a PH2.0mm pitch.

[0082] The transmission and interface circuit includes: a plurality of signals are input to the connector through zero resistance resistors, and the signals are transmitted to external devices or received from external devices through the connector.

[0083] The working principle of the fourth control circuit is:

[0084] It includes: input and enable control part:

[0085] Power input: the positive pole of the battery (BAT) is connected to the source of the third field effect transistor Q39 (PED3008MA). At the same time, BAT is divided by resistors R197 and R198 to provide a reference voltage for subsequent control.

[0086] Enable control: the enable signal FM_EN is connected to the base of the fifth transistor Q44 (2N7002) through resistor R199, the emitter of Q44 is connected to ground, and the collector is connected to the gate of Q39; when FM_EN is high, Q44 is turned on, so that Q39 is turned on, and the battery voltage is transmitted to the back; when FM_EN is low, Q44 is cut off, Q39 is also cut off, and the battery voltage transmission is cut off.

[0087] Power conversion part:

[0088] Input filtering: the voltage after Q39 is first connected to a group of capacitors (C108, C114, C111) for filtering, to filter out high and low frequency noise and make the voltage input to the conversion chip more stable.

[0089] Conversion chip: the filtered voltage is connected to the input terminal Vin (pin 4) of the power conversion chip U7 (TMI2282L). Other pins of the chip also have corresponding connections:

[0090] FSW pin (pin 2) is connected to resistors R56 and R169, which is used to set the switching frequency and other parameters;

[0091] ISET pin (pin 3) can be used to set the current limit, etc., by connecting a resistor for parameter setting;

[0092] GND pin (pin 3, 7) is grounded, providing a reference potential for the chip;

[0093] SW pin (pin 5, 6) is a switch output pin, connected to an external inductor L10, for implementing voltage conversion;

[0094] FB pin (pin 1) is connected to a feedback resistor network (R47, R182), which samples the output voltage and feeds it back to adjust the output of the chip to stabilize the output voltage.

[0095] Output filtering and connection part:

[0096] Output filtering: the voltage after the inductor L10 from the SW pin of U7 is further filtered by a set of capacitors (C115, C118, C116, C134) to remove ripple and output a stable 5V audio power supply (FM5.0V Audio).

[0097] External connection: the final stable 5V audio power supply is output through the connector CON6 (PH2.0mm2 pin) to supply power to external audio devices, etc.

[0098] The working principle of the transmission and interface circuit is:

[0099] Multiple signals are input to the connector through zero-value resistors, and the signals are transmitted to external devices or received from external devices through the connector. There are four signals, AM / FM ST, MUTE, AM / FM SCL, and AM / FM SDA. These signals are transmitted to the connector CON7 pins 1-4 after passing through resistors R110, R214, R215, and R218 (all with a resistance of 0R, mainly for identification or reservation). CON7 is a ZHL1.5mm pitch 5-pin vertical connector, with pin 5 grounded. Through this connector, the four signals can be transmitted to external devices or received from external devices.

[0100] Example 4 provides a power management system, including the power master board of any one of examples 1-3,

[0101] The main control board has a perfect LDO power management module, which can realize a series of functions such as anti-reverse connection of power input, multi-stage voltage conversion and voltage stabilization, and accurate control of each output voltage. At the same time, it also covers a variety of signal transmission and interface circuits, which can effectively realize the interactive communication with external equipment. With such a main control board, the power supply system can provide stable, reliable and adaptive power supply for various electronic devices with different voltage requirements, meet various application scenarios, and ensure stable operation of the device.

[0102] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model. The ordinary skilled in the art can change, modify, replace and modify the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model, and all these changes should belong to the protection scope of the utility model claim.

Claims

1. A power master board, characterized by, Comprising: LDO power management module; The LDO power management module comprises: The first voltage unit, the positive electrode of the power supply is connected with the input end of the voltage converter through a diode, the output end of the voltage converter is connected with the inductor, and then the stable voltage is output after passing through a group of filter capacitors; the feedback pin of the voltage converter is connected to the resistance voltage dividing circuit for adjusting the output voltage; the first enable signal is connected to the base of the first transistor through a resistor; the collector of the first transistor is connected to the gate of the first field effect transistor through a resistor; The first voltage stabilizing unit, the input end of the first voltage stabilizing unit is connected with the output end of the first voltage unit; the output voltage of the first voltage unit is received and converted into the second voltage; The second voltage stabilizing unit, the input end of the second voltage stabilizing unit is connected with the output end of the first voltage stabilizing unit, and the second voltage is converted into the third voltage.

2. The power master according to claim 1, wherein, The first voltage unit outputs 12v voltage; the first voltage stabilizing unit outputs 5V voltage; and the second voltage stabilizing unit outputs 3.3V voltage.

3. The power master according to claim 1, wherein, The first voltage stabilizing unit comprises a first chip, the output voltage of the first voltage unit is connected with a resistor and a filter capacitor in sequence, and then connected with the input end of the first chip, and the output end of the first chip is connected with a filter capacitor to output the second voltage.

4. The power master according to claim 1, wherein, The second voltage stabilizing unit comprises a second chip, the output voltage of the first voltage stabilizing unit is connected with a resistor and a filter capacitor in sequence, and then connected with the input end of the second chip, and the output end of the second chip is connected with a filter capacitor to output the third voltage.

5. The power master according to claim 1, wherein, The LDO power management module further comprises a first control circuit comprising a second transistor and a third transistor, the second enable signal is connected to the second transistor through a resistor to control the output of the second voltage; and the third enable signal is connected to the third transistor through a resistor to control the output of the third voltage.

6. The power master according to claim 1, wherein, The LDO power management module further comprises a second control circuit comprising: The fourth enable signal is connected to the base of the fourth transistor through a resistor, and the base of the fourth transistor is also connected to the ground through a resistor; the drain of the second field effect transistor is connected with the output voltage of the first voltage stabilizing unit, the source of the second field effect transistor is connected with the input end of the isolation power supply device, the collector of the fourth transistor is connected with the gate of the second field effect transistor, the OUT end of the isolation power supply device outputs the first alternating voltage, and the input and output ends of the isolation power supply device are respectively connected to the ground through capacitors.

7. The power master according to claim 1, wherein, The LDO power management module further comprises a third control circuit comprising: The output signal of the third voltage is connected to the control end of the reference source chip after passing through a diode and a resistor, and the output end of the reference source chip is connected with a capacitor in parallel for filtering.

8. The power master according to claim 1, wherein, The power main control board further comprises a radio power control module, and the radio power control module comprises a fourth control circuit comprising: The positive electrode of the battery is connected with the source of the third field effect transistor, and the voltage is divided through a voltage dividing resistor; the fourth enable signal is connected to the base of the fifth transistor through a resistor, the emitter of the fifth transistor is connected to the ground, and the collector of the fifth transistor is connected with the gate of the third field effect transistor; The output of the third field effect transistor is input to the input end of the power conversion chip after being filtered through a group of capacitors, and the output end of the power conversion chip is connected with an inductor and a filter capacitor, and then connected with a patch connector.

9. The power master according to claim 8, wherein, The radio power control module further comprises a transmission and interface circuit comprising: The multi-channel signals are input to the connector through zero resistance resistors, and the signals are transmitted to external devices through the connector or received from the external devices.

10. A power supply system characterized by comprising: Comprising: The power master board according to any one of claims 1-9.

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