Power supply system and electronic device

Abstract

The utility model provides a power supply system and electronic equipment. The power supply system comprises a power supply control module, an over-current detection module, a low-voltage detection module, an AND gate logic module, a power supply module and a control unit. The power supply control module is respectively connected with the first resistor, the first NMOS tube, the second resistor, the gate logic module, the first NMOS tube and the second NMOS tube; the first NMOS tube is also respectively connected with the second NMOS tube and the power supply module; the power supply module is also connected with the control unit; the control unit is also connected with the over-current detection module and the low-voltage detection module; the second NMOS tube is also connected with the over-current detection resistor and the over-current detection module; the over-current detection resistor is also connected with the over-current detection module and the low-voltage detection module; the AND gate logic module is also connected with the over-current detection module and the low-voltage detection module; the power supply system provided by the utility model is high in safety performance, and various fault protection such as reverse connection, low voltage, overvoltage, overcurrent and the like of a device battery is realized; and the frequency of replacing the fuse after a fault occurs is reduced.

Description

Technical Field

[0001] The utility model relates to the field of electricity, in particular to a circuit protection technology after a power failure, in particular to a power supply system and an electronic device. Background Art

[0002] With the rapid development of electric vehicles, people are paying more and more attention to automotive electronic safety, and electric vehicle safety accidents are still worrying.

[0003] In the prior art, fuses are an effective means of protecting automotive electronic equipment after a fault occurs. However, fuses need to be replaced after they are activated, which is troublesome to operate. Moreover, a single automotive fuse cannot meet people's requirements for automotive electronic safety. Utility Model Content

[0004] The purpose of the utility model is to provide a power supply system and an electronic device, which are used to solve the problems pointed out in the above background technology.

[0005] In a first aspect, the utility model provides a power supply system, which is applied to electronic equipment, and the power supply system includes: a power supply control module, an overcurrent detection module, a low voltage detection module, an AND gate logic module, a power supply module and a control unit; wherein, the first end of the power supply control module is respectively connected to one end of a first resistor and a source of a first NMOS tube, and the first end of the power supply control module is also used to access the power supply provided by the device battery of the electronic equipment, the second end of the power supply control module is respectively connected to the other end of the first resistor and one end of a second resistor, the third end of the power supply control module is connected to the first end of the AND gate logic module, the fourth end of the power supply control module is connected to the gate of the first NMOS tube, and the fifth end of the power supply control module is connected to the gate of the second NMOS tube; the other end of the second resistor is connected to ground; the drain of the first NMOS tube is respectively connected to the drain of the second NMOS tube and one end of the power module; the other end of the power module is connected to the first end of the control unit; the second end of the control unit is connected to the first end of the overcurrent detection module, and the third end of the control unit is connected to the first end of the low voltage detection module; the source of the second NMOS tube is respectively connected to the first end of the overcurrent detection resistor and the second end of the overcurrent detection module; the second end of the overcurrent detection resistor is respectively connected to the third end of the overcurrent detection module and the second end of the low voltage detection module, and the second end of the overcurrent detection resistor is also used to connect the load; the second end of the AND gate logic module is connected to the fourth end of the overcurrent detection module, and the third end of the AND gate logic module is connected to the third end of the low voltage detection module.

[0006] In the utility model, a power supply system with higher safety performance is provided through the design of a power control module, an overcurrent detection module, a low voltage detection module, an AND gate logic module, a power supply module and a control unit. By applying the system to electronic equipment, multiple fault protections such as reverse connection of equipment batteries, low voltage, overvoltage, overcurrent, etc. are effectively realized; at the same time, the number of times for replacing fuses after a fault occurs in existing electronic equipment that relies on fuses for fault protection is reduced.

[0007] In an implementation of the first aspect, the overcurrent detection module includes: a seventh resistor, an eighth resistor, a first operational amplifier, a second operational amplifier and a built-in power supply; wherein, the negative input terminal of the first operational amplifier is connected to one end of the overcurrent detection resistor, the positive input terminal of the first operational amplifier is connected to the other end of the overcurrent detection resistor, and the output terminal of the first operational amplifier is connected to the negative input terminal of the second operational amplifier; the positive input terminal of the second operational amplifier is respectively connected to one end of the seventh resistor and one end of the eighth resistor, and the output terminal of the second operational amplifier is connected to the second end of the AND gate logic module; the other end of the seventh resistor is connected to the built-in power supply; the other end of the eighth resistor is used for grounding.

[0008] In an implementation of the first aspect, the power supply system further includes: a boost module, a boost controller and a linear voltage regulation module; wherein, a first end of the linear voltage regulation module is connected to the other end of the power module, a second end of the linear voltage regulation module is connected to the fourth end of the control unit, and a third end of the linear voltage regulation module is connected to the first end of the boost controller; a second end of the boost controller is connected to the fifth end of the control unit, a third end of the boost controller is connected to the first end of the boost module, and a fourth end of the boost controller is connected to the second end of the boost module; a third end of the boost module is connected to the other end of the overcurrent detection resistor, and a fourth end of the boost module is connected to the fourth end of the linear voltage regulation module, and is used to jointly connect the load.

[0009] In this implementation, the voltage automatic adjustment function is realized through the design of the boost module, boost controller and linear voltage regulation module; when the device battery output voltage of the electronic device is unstable, the voltage output can be automatically adjusted or even cut off to protect the safety of the subsequent load; at the same time, due to the linear wide voltage output, the power supply system can be more adaptable to electronic devices with different voltage requirements.

[0010] In an implementation of the first aspect, the boost module includes: an inductor, a capacitor, a third NMOS tube and a fourth NMOS tube; wherein, one end of the inductor is connected to the other end of the overcurrent detection resistor, and the other end of the first inductor is respectively connected to the drain of the third NMOS tube and the source of the fourth NMOS tube; the gate of the third NMOS tube is connected to the fourth end of the boost controller, and the source of the third NMOS tube is grounded; the gate of the fourth NMOS tube is connected to the third end of the boost controller, the drain of the fourth NMOS tube is connected to one end of the capacitor, and is used to be connected to the load together with the fourth end of the linear voltage regulation module; the other end of the capacitor is grounded.

[0011] In an implementation of the first aspect, the linear voltage regulation module includes: a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; wherein one end of the third resistor is respectively connected to one end of the fourth resistor and the fourth end of the control unit, and the other end of the third resistor is respectively connected to one end of the fifth resistor, one end of the sixth resistor and the first end of the boost controller; the other end of the fourth resistor is connected to the other end of the power module; the other end of the fifth resistor is used for grounding; the other end of the sixth resistor is used for connecting to the load together with the fourth end of the boost module.

[0012] In an implementation manner of the first aspect, the power supply system further includes: a voltage dividing module; the voltage dividing module is connected to the control unit and the boost module respectively.

[0013] In an implementation manner of the first aspect, the power supply system further includes: a display module; and the display module is connected to the control unit.

[0014] In an implementation manner of the first aspect, the control unit adopts an MCU; and / or the power module adopts a 3.3V power module.

[0015] In a second aspect, the utility model provides an electronic device, comprising: a device battery and the above-mentioned power supply system; wherein the device battery is connected to the power supply system, and the device battery is used to provide power supply to the power supply system.

[0016] In an implementation manner of the second aspect, the electronic device further includes: a load; and the power supply system is connected to the load.

[0017] As described above, the power supply system and electronic equipment described in the utility model have the following beneficial effects:

[0018] (1) Compared with the prior art, the power supply system provided by the utility model realizes multiple fault protections for electronic equipment such as reverse connection of device battery, overvoltage, undervoltage, overcurrent, etc., thereby improving the safety of electronic equipment and effectively avoiding fires caused by faults.

[0019] (2) The utility model reduces the number of times fuses need to be replaced after a failure of an electronic device.

[0020] (3) When the output voltage of the device battery of the electronic device is unstable, the utility model can automatically adjust the voltage output or even cut off the voltage output, thereby effectively protecting the safety of the subsequent load.

[0021] (4) The utility model can output a linearly adjustable wide voltage, thereby adapting to devices with different voltage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic diagram of the structure of the power supply system described in an embodiment of the utility model.

[0023] Figure 2 Shown is a structural schematic diagram of the overcurrent detection module described in an embodiment of the utility model.

[0024] Figure 3 Shown is a structural schematic diagram of the low voltage detection module described in an embodiment of the utility model.

[0025] Figure 4 Shown is a schematic structural diagram of the boost module described in an embodiment of the utility model.

[0026] Figure 5 Shown is a structural schematic diagram of the linear voltage regulation module described in an embodiment of the utility model.

[0027] Figure 6 Shown is a schematic structural diagram of the voltage divider module described in an embodiment of the utility model.

[0028] Figure 7 Shown is a schematic structural diagram of an electronic device according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0031] It should be noted that fuses, as an effective means of protection after failure of existing automotive electronic equipment, can only play a protective role after a failure of automotive electronic equipment occurs, and cannot play a warning function before the electronic equipment fails; moreover, since different automotive products have different voltage requirements, a device that can output a linear wide voltage is also particularly important.

[0032] See also Figures 1 to 7 The following embodiments of the utility model provide a power supply system and an electronic device. Compared with the prior art, the power supply system provided by the utility model realizes multiple fault protections for the device battery reverse connection, overvoltage, undervoltage, overcurrent and the like of the electronic device, improves the safety of the electronic device, and effectively avoids fires caused by faults; the utility model reduces the number of times the fuse is replaced after a fault in the electronic device; the utility model can automatically adjust the voltage output or even cut off the voltage output when the device battery output voltage of the electronic device is unstable, thereby effectively protecting the safety of the subsequent load; the utility model can realize output linear adjustable wide voltage, thereby adapting to devices with different voltage requirements.

[0033] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] In one embodiment, the utility model provides a power supply system for use in electronic equipment.

[0035] It should be noted that the electronic equipment is not limited to automotive electronic equipment.

[0036] like Figure 1 As shown, in one embodiment, the power supply system includes: a power supply control module 1, an overcurrent detection module 2, a low voltage detection module 3, an AND gate logic module 4, a power supply module 5 and a control unit 6.

[0037] Specifically, the first end of the power control module 1 (corresponding to Figure 1 In the embodiment, the VIN pin of the power control module is respectively connected to one end of the first resistor R1 and the source of the first NMOS tube Q1. The first end of the power control module 1 is also used to access the power supply provided by the device battery of the electronic device (such as Figure 1 As shown, the power supply is a 12V voltage provided by a car battery), the second end of the power control module 1 (corresponding to Figure 1 The OV pin of the power control module is respectively connected to the other end of the first resistor R1 and one end of the second resistor R2, and the third end of the power control module 1 (corresponding to Figure 1 In the embodiment, the EN pin of the power control module) is connected to the first end of the AND gate logic module 4 (corresponding to Figure 1 The fourth end of the power control module 1 (corresponding to the Y pin of the middle gate logic module 4) is connected. Figure 1 The DGATE pin of the power control module) is connected to the gate of the first NMOS tube Q1, and the fifth terminal of the power control module 1 (corresponding to Figure 1 In the embodiment, the HGATE pin of the power control module is connected to the gate of the second NMOS tube Q2; the other end of the second resistor R2 is grounded; the drain of the first NMOS tube Q1 is respectively connected to the drain of the second NMOS tube Q2 and one end of the power module 5; the other end of the power module 5 is connected to the first end of the control unit 6; the second end of the control unit 6 is connected to the first end of the overcurrent detection module 2, and the third end of the control unit 6 is connected to the first end of the low voltage detection module 3; the source of the second NMOS tube Q2 is respectively connected to the first end of the overcurrent detection resistor R9 and the second end of the overcurrent detection module 2; the second end of the overcurrent detection resistor R9 is respectively connected to the third end of the overcurrent detection module 2 and the second end of the low voltage detection module 3, and the second end of the overcurrent detection resistor R9 is also used to connect the load; the second end of the AND gate logic module 4 is connected to the fourth end of the overcurrent detection module 2, and the third end of the AND gate logic module 4 is connected to the third end of the low voltage detection module 3.

[0038] In this embodiment, the power control module 1 includes a reference voltage inside.

[0039] Specifically, by comparing the reference voltage with the voltage input to the second end of the power control module 1 , overvoltage protection for the device battery is achieved.

[0040] In one embodiment, the reference voltage is 1.25V.

[0041] like Figure 1 As shown, in one embodiment, the power control module 1 adopts the LM7481 chip.

[0042] like Figure 1 As shown, the 12V power supply provided by the car battery is input to the VIN pin of the power control module 1. When the car battery is reversed, the VIN of the power control module 1 has no high voltage, the power control module 1 does not work, the DGATE and HGATE of the power control module 1 both output low levels, Q1 and Q2 are turned off, and the entire power system has no power, thereby realizing battery reverse connection protection.

[0043] When the car battery input voltage is higher than 20V, the OV voltage of the power control module 1 is:

[0044] OV voltage = input voltage × R2 / (R2+R1).

[0045] In one embodiment, the input voltage is 20V, R2 is 1KΩ, and R1 is 15KΩ, then the OV voltage calculated by the above formula is 1.25V.

[0046] When the OV voltage is greater than the 1.25V reference voltage inside the power control module 1, the HGATE of the power control module 1 outputs a low level, Q2 is turned off, and the DGATE of the power control module 1 outputs a high level, Q1 is turned on normally, and the control unit 6 works normally at this time, but the load voltage has no output, thereby realizing overvoltage protection of the car battery.

[0047] When the car battery voltage is normally input at 12V, the VIN of the power control module 1 is powered on normally, the OV pin input voltage of the power control module 1 is lower than 1.25V, the DGATE and HGATE pins of the power control module 1 both output high levels, Q1 and Q2 are normally turned on, and the power flows through the overcurrent detection resistor R9 and is input into the subsequent circuit.

[0048] It should be noted that the overcurrent detection module 2 sets the overcurrent parameter by detecting the voltage value on the overcurrent detection resistor R9. In the non-action state (when the overcurrent protection action is not triggered), the output is a high level. When the current flowing through the overcurrent detection resistor R9 is greater than the set overcurrent parameter, the overcurrent detection module 2 outputs a low level to the second end of the AND gate logic module 4 (corresponding to Figure 1 A pin of the middle gate logic module 4).

[0049] like Figure 1 and Figure 2 As shown, in one embodiment, the overcurrent detection module 2 includes: a seventh resistor R7, an eighth resistor R8, a first operational amplifier AMP1, a second operational amplifier AMP2 and a built-in power supply.

[0050] Specifically, the negative input terminal of the first operational amplifier AMP1 is connected to one end of the overcurrent detection resistor R9, the positive input terminal of the first operational amplifier AMP1 is connected to the other end of the overcurrent detection resistor R9, the output terminal of the first operational amplifier AMP1 is connected to the negative input terminal of the second operational amplifier AMP2; the positive input terminal of the second operational amplifier AMP2 is respectively connected to one end of the seventh resistor R7 and one end of the eighth resistor R8, the output terminal OUT of the second operational amplifier AMP2 is connected to the second end (corresponding to the positive input terminal of the AND gate logic module 4) of the AND gate logic module 4. Figure 1The other end of the seventh resistor R7 is connected to the built-in power supply; the other end of the eighth resistor R8 is used for grounding.

[0051] It should be noted that the output terminal OUT of the second operational amplifier AMP2 is also connected to the second terminal of the control unit 6 , that is, the first terminal of the overcurrent detection module 2 and the fourth terminal of the overcurrent detection module 2 are the same terminal.

[0052] The working principle of the overcurrent detection module 2 is further explained below through specific embodiments.

[0053] like Figure 2 As shown, in one embodiment, R9=0.001Ω, R7=1kΩ, R8 is an adjustable resistor, the built-in power supply is 5V, and the gain of the first operational amplifier AMP1 is Gain=20.

[0054] Assuming that the overcurrent protection is set to 64A, the voltage VSENS of R9 when overcurrent occurs is VSENS=0.001×64=0.064V.

[0055] The voltage at the output terminal of the first operational amplifier AMP1 is: VSENS×Gain=0.064×20=1.28V.

[0056] The positive voltage V+ of the second operational amplifier AMP2 = 5×R8 / (R7+R8) = 5×R8 / (1+R8);

[0057] Let V+ = 1.28V, and we can calculate that R8 = 330Ω.

[0058] When V+>the negative voltage V- of the second operational amplifier AMP2, the output terminal OUT of the second operational amplifier AMP2 outputs a low level, triggering the overcurrent protection action; when V+<V-, OUT outputs a high level, and the overcurrent protection action is not triggered.

[0059] like Figure 1 and Figure 3 As shown, in one embodiment, the low voltage detection module 3 includes: a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a third operational amplifier AMP3, and the low voltage detection module 3 also includes a built-in power supply.

[0060] like Figure 3 As shown, in one embodiment, the built-in power supply of the low voltage detection module 3 is also 5V.

[0061] Specifically, one end of the tenth resistor R10 is connected to the other end of the overcurrent detection resistor R9, and the other end of the tenth resistor R10 is respectively connected to one end of the eleventh resistor R11 and the positive input end of the third operational amplifier AMP3; the other end of the eleventh resistor R11 is grounded; the negative input end of the third operational amplifier AMP3 is respectively connected to one end of the twelfth resistor R12 and one end of the thirteenth resistor R13; the output end OUT of the third operational amplifier AMP3 is connected to the third end (corresponding to the third end) of the AND gate logic module 4 Figure 1 The other end of the twelfth resistor R12 is connected to the built-in power supply of 5V; the other end of the thirteenth resistor R13 is grounded.

[0062] It should be noted that the output terminal OUT of the third operational amplifier AMP3 is also connected to the third terminal of the control unit 6 , that is, the first terminal of the low voltage detection module 3 and the third terminal of the low voltage detection module 3 are the same terminal.

[0063] The working principle of the low voltage detection module 3 is further explained below through specific embodiments.

[0064] like Figure 3 As shown, in one embodiment, R10 = 4.7KΩ, R11 = 1KΩ, R12 = 1KΩ, and R13 is an adjustable resistor.

[0065] Assuming that the low voltage 5.4V protection action is set, the positive voltage V+ of the third operational amplifier AMP3 = 5.4×R11 / (R11+R10) = 5.4×1 / (11+4.7) = 0.947V.

[0066] The negative-stage voltage V- of the third operational amplifier AMP3 is 5×R13 / (R13+R12)=5×R13 / (R13+1).

[0067] Let V-=V+=0.947V, and by calculation we can get R13=220Ω.

[0068] Set R13 = 220Ω. When V->V+, the output terminal OUT of the third operational amplifier AMP3 outputs a low level, triggering the low voltage protection action; when V-<V+, OUT outputs a high level, and the low voltage protection action is not triggered.

[0069] It should be noted that the low voltage detection module 3 outputs a high level when not in action (when the low voltage protection action is not triggered); when the low voltage detection module 3 detects that the voltage is lower than 5.4v, it outputs a low level to the B pin of the AND gate logic module 4.

[0070] It should be noted that when any of the two pins A and B of the AND gate logic module 4 is low, the Y pin will output a low level to the EN pin of the power control module 1. At this time, the power control module 1 cannot work, Q1 and Q2 are both turned off, and the control unit 6 works normally because the body diode of Q1 is turned on (always in the on state, and a small current can flow from the source of Q1 to the drain), and the load voltage has no output, thereby achieving over-current and under-voltage protection.

[0071] In one embodiment, the control unit 6 is an MCU.

[0072] like Figure 1 As shown, in one embodiment, the control unit 6 uses an STM32 chip.

[0073] In one embodiment, the power module 5 is a 3.3V power module.

[0074] It should be noted that, in this embodiment, the input voltage of the power module 5 is a wide voltage range of 3.3V-20V, and the output voltage is 3.3V, which is supplied to the subsequent circuit.

[0075] like Figure 1 As shown, in one embodiment, the power supply system further includes: a boost module 7 , a boost controller 8 and a linear voltage regulation module 9 .

[0076] Specifically, the first end of the linear voltage regulating module 9 is connected to the other end of the power module 5, and the second end of the linear voltage regulating module 9 is connected to the fourth end of the control unit 6 (corresponding to Figure 1 The control unit 6 outputs the Duty pin), the third end of the linear voltage regulation module 9 is connected to the first end of the boost controller 8 (corresponding to Figure 1 The second end of the boost controller 8 is connected to the fifth end of the control unit 6, and the third end of the boost controller 8 (corresponding to the FB pin of the boost controller 8) is connected; the second end of the boost controller 8 is connected to the fifth end of the control unit 6, and the third end of the boost controller 8 (corresponding to the Figure 1 In the embodiment, the TG pin of the boost controller 8 is connected to the first end of the boost module 7, and the fourth end of the boost controller 8 (corresponding to Figure 1 In the embodiment, the BG pin of the boost controller 8 is connected to the second end of the boost module 7; the third end of the boost module 7 is connected to the other end of the overcurrent detection resistor R9, and the fourth end of the boost module 7 is connected to the fourth end of the linear voltage regulation module 9, and is used to jointly connect the load.

[0077] like Figure 1 As shown, in one embodiment, the boost controller 8 uses the LTC3787 chip.

[0078] Boost controller 8, BG, TG are output signals, output 350K duty ratio adjustable square wave, control the charging energy storage and boost output switching of boost module 7, FB is voltage feedback signal, FB internal fixed voltage is 1.2V, the boosted output voltage is fed back to FB pin after resistor voltage division, and the desired output voltage value can be adjusted by adjusting the feedback resistance value (corresponding to the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 in the linear voltage regulation module).

[0079] like Figure 1 and Figure 4 As shown, in one embodiment, the boost module 7 includes: an inductor L, a capacitor C, a third NMOS transistor Q3 and a fourth NMOS transistor Q4.

[0080] Specifically, one end of the inductor L is connected to the other end of the overcurrent detection resistor R9, and the other end of the first inductor L is respectively connected to the drain of the third NMOS tube Q3 and the source of the fourth NMOS tube Q4; the gate of the third NMOS tube Q3 is connected to the fourth end BG of the boost controller 8, and the source of the third NMOS tube Q3 is grounded; the gate of the fourth NMOS tube Q4 is connected to the third end TG of the boost controller 8, the drain of the fourth NMOS tube Q4 is connected to one end of the capacitor C, and is used to be connected to the load together with the fourth end of the linear voltage regulation module 9; the other end of the capacitor C is grounded.

[0081] It should be noted that if Figure 4 As shown, for the boost module 7, its input voltage is a 12V car battery; when BG is high, TG is low, then Q3 is turned on, Q4 is turned off, and the 12V voltage charges L; when L is fully charged, BG is low, TG is high, then Q3 is turned off, Q4 is turned on, and the 12V car battery supplies power to the subsequent stage C, while the electric energy stored in L is superimposed and output to the subsequent stage, and the boost is completed.

[0082] BG and TG are 350K square waves with adjustable duty cycle. When BG is high, TG is low, and when BG1 is low, TG is high. The 350K operating frequency can ensure that L charging is not saturated.

[0083] like Figure 1 and Figure 5 As shown, in one embodiment, the linear voltage regulating module 9 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6.

[0084] Specifically, one end of the third resistor R3 is connected to one end of the fourth resistor R4 and the fourth end (output Duty) of the control unit 6, and the other end of the third resistor R3 is connected to one end of the fifth resistor R5, one end of the sixth resistor R6 and the first end of the boost controller 8 (corresponding to Figure 5 , VFB = 1.2V); the other end of the fourth resistor R4 is connected to the other end of the power module 5 (corresponding to Figure 5 , connected to 3.3V); the other end of the fifth resistor R5 is used for grounding; the other end of the sixth resistor R6 (corresponding to Figure 5 In the figure, VBOOST) is used to be connected to the load together with the fourth end of the boost module 7.

[0085] It should be noted that, for the linear voltage regulation module 9, Duty is an adjustable square wave output by the control unit 6, different duty ratios correspond to different energies, and the duty ratio is linearly adjustable, so the VBOOST output voltage is linearly adjustable.

[0086] I1=(VBOOST-VFB) / R6;

[0087] I2=(3.3×Duty-VFB) / R3;

[0088] IFB=VFB / R5;

[0089] I1+I2=IFB;

[0090] VBOOST=R6×I1+VFB=R6×(IFB-I2)+VFB=R6×{VFB / R5-(3.3×Duty-VFB) / R3}+VFB.

[0091] like Figure 1 As shown, in one embodiment, the power supply system further includes: a display module 10 ; the display module 10 is connected to the control unit 6 .

[0092] It should be noted that the display module 10 can be used to display various fault information, input and output voltage values, and display the current output voltage value, linearly regulated output voltage, etc.

[0093] In one embodiment, the display module 10 is a touch display.

[0094] like Figure 1 As shown, in one embodiment, the power supply system further includes: a voltage dividing module 11; the voltage dividing module 11 is connected to the control unit 6 and the boosting module 7 respectively.

[0095] It should be noted that, through the voltage dividing module 11 , the divided voltage is supplied to the control unit 6 , so that the control unit 6 knows what the boosted voltage is, and can then display the boosted voltage on the display module 10 .

[0096] In addition, the control unit 6 adjusts the voltage by adjusting the Duty. If the voltage is not divided by the voltage dividing module 11, the control unit 6 cannot withstand a very high voltage.

[0097] like Figure 6 As shown, in one embodiment, the voltage dividing module 11 includes a fourteenth resistor R14, a fifteenth resistor R15 and a sixteenth resistor R16.

[0098] Specifically, one end of the fourteenth resistor R14 is connected to the fourth end of the boost module 7, the other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is respectively connected to one end of the sixteenth resistor R16 and the sixth end of the control unit 6; the other end of the sixteenth resistor R16 is grounded.

[0099] It should be noted that the voltage division ratio of the voltage division module 11 can be adjusted by adjusting the resistance values ​​of the fourteenth resistor R14 , the fifteenth resistor R15 and the sixteenth resistor R16 .

[0100] Such as Figure 6 As shown, in one embodiment, R14 = 200Ω, R15 = 6.8KΩ, R16 = 1KΩ, then

[0101] VOUT=VIN×R16 / (R14+R15+R16)=VIN×1 / 8,

[0102] That is, the voltage dividing module 11 realizes a 1 / 8 voltage dividing function.

[0103] like Figure 7 As shown, in one embodiment, the utility model further provides an electronic device, which includes: a device battery 71 and the above-mentioned power supply system 72.

[0104] Specifically, the device battery 71 is connected to the power system 72 , and the device battery 71 is used to provide power supply to the power system 72 .

[0105] In one embodiment, the electronic device further includes: a load 73 .

[0106] Specifically, the power supply system 72 is connected to the load 73 .

[0107] It should be noted that the working principle of the power supply system 72 applied to the electronic device can be referred to the above introduction to the power supply system, so it will not be described in detail here.

[0108] In one embodiment, the electronic device is an automotive electronic device.

[0109] It should be noted that by applying the above-mentioned power supply system to automotive electronic equipment, the safety of automotive electronic equipment is improved, and fires caused by short circuits and damage to automotive electronic equipment are effectively prevented; the replacement of damaged automotive fuses caused by automotive electronic equipment failures or reverse battery connection is reduced; and the automatic overvoltage adjustment function is realized, and by outputting a linear wide voltage, it can meet the needs of more products.

[0110] The descriptions of the processes or structures corresponding to the above-mentioned figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.

[0111] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A power supply system, applied to electronic equipment, characterized in that: The power supply system includes: a power supply control module, an overcurrent detection module, a low voltage detection module, an AND gate logic module, a power supply module and a control unit; wherein, The first end of the power control module is connected to one end of the first resistor and the source of the first NMOS tube respectively, the first end of the power control module is also used to access the power supply provided by the device battery of the electronic device, the second end of the power control module is connected to the other end of the first resistor and one end of the second resistor respectively, the third end of the power control module is connected to the first end of the AND gate logic module, the fourth end of the power control module is connected to the gate of the first NMOS tube, and the fifth end of the power control module is connected to the gate of the second NMOS tube; The other end of the second resistor is grounded; The drain of the first NMOS tube is connected to the drain of the second NMOS tube and one end of the power module respectively; The other end of the power module is connected to the first end of the control unit; The second end of the control unit is connected to the first end of the overcurrent detection module, and the third end of the control unit is connected to the first end of the low voltage detection module; The source of the second NMOS tube is respectively connected to the first end of the overcurrent detection resistor and the second end of the overcurrent detection module; The second end of the overcurrent detection resistor is connected to the third end of the overcurrent detection module and the second end of the low voltage detection module respectively, and the second end of the overcurrent detection resistor is also used to connect to a load; The second end of the AND gate logic module is connected to the fourth end of the overcurrent detection module, and the third end of the AND gate logic module is connected to the third end of the low voltage detection module.

2. The power supply system according to claim 1, characterized in that: The overcurrent detection module includes: a seventh resistor, an eighth resistor, a first operational amplifier, a second operational amplifier and a built-in power supply; wherein, The negative input terminal of the first operational amplifier is connected to one end of the overcurrent detection resistor, the positive input terminal of the first operational amplifier is connected to the other end of the overcurrent detection resistor, and the output terminal of the first operational amplifier is connected to the negative input terminal of the second operational amplifier; The positive input terminal of the second operational amplifier is connected to one end of the seventh resistor and one end of the eighth resistor respectively, and the output terminal of the second operational amplifier is connected to the second end of the AND gate logic module; The other end of the seventh resistor is connected to the built-in power supply; The other end of the eighth resistor is grounded.

3. The power supply system according to claim 1 or 2, characterized in that: The power supply system further includes: a boost module, a boost controller and a linear voltage regulation module; wherein, The first end of the linear voltage regulating module is connected to the other end of the power module, the second end of the linear voltage regulating module is connected to the fourth end of the control unit, and the third end of the linear voltage regulating module is connected to the first end of the boost controller; The second end of the boost controller is connected to the fifth end of the control unit, the third end of the boost controller is connected to the first end of the boost module, and the fourth end of the boost controller is connected to the second end of the boost module; The third end of the boost module is connected to the other end of the overcurrent detection resistor, and the fourth end of the boost module is connected to the fourth end of the linear voltage regulation module, and is used to be commonly connected to the load.

4. The power supply system according to claim 3, characterized in that: The boost module includes: an inductor, a capacitor, a third NMOS transistor and a fourth NMOS transistor; wherein, One end of the inductor is connected to the other end of the overcurrent detection resistor, and the other end of the inductor is connected to the drain of the third NMOS tube and the source of the fourth NMOS tube respectively; The gate of the third NMOS tube is connected to the fourth end of the boost controller, and the source of the third NMOS tube is grounded; The gate of the fourth NMOS tube is connected to the third end of the boost controller, the drain of the fourth NMOS tube is connected to one end of the capacitor, and is used to be connected to the load together with the fourth end of the linear voltage regulation module; The other end of the capacitor is grounded.

5. The power supply system according to claim 3, characterized in that: The linear voltage regulating module includes: a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; wherein, One end of the third resistor is respectively connected to one end of the fourth resistor and the fourth end of the control unit, and the other end of the third resistor is respectively connected to one end of the fifth resistor, one end of the sixth resistor and the first end of the boost controller; The other end of the fourth resistor is connected to the other end of the power module; The other end of the fifth resistor is used for grounding; The other end of the sixth resistor is used to be connected to the load together with the fourth end of the boost module.

6. The power supply system according to claim 3, characterized in that: The power supply system further comprises: a voltage dividing module; the voltage dividing module is connected to the control unit and the voltage boosting module respectively.

7. The power supply system according to claim 1, characterized in that: The power supply system further includes: a display module; the display module is connected to the control unit.

8. The power supply system according to claim 1, characterized in that: The control unit adopts MCU; and / or the power module adopts a 3.3V power module.

9. An electronic device, characterized in that: The electronic device comprises: a device battery and a power supply system as claimed in any one of claims 1 to 8; wherein: The device battery is connected to the power supply system, and the device battery is used to provide power supply to the power supply system.

10. The electronic device according to claim 9, characterized in that: The electronic device further includes: a load; and the power supply system is connected to the load.

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