A step-down power supply starting circuit and a patrol robot

Abstract

The application provides a step-down power supply starting circuit, which comprises a step-down power supply chip module, a current limiting module, an energy storage module, a hardware control module and a software control module. The hardware control module and the software control module are synchronously set, so that the software can still take over the control of the starting of the power supply starting circuit after the hardware control fails. The starting mode is flexible, and the circuit uses a power supply chip, so the price is low. The current limiting module and the energy storage module are added after the step-down voltage conversion module and before the load, the current required by the load is limited by the current limiting module, the hardware damage caused by overcurrent in the power-on moment is prevented, the rear stage of the step-down power supply starting circuit can start with the load, and the application occasions are wide.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic technology, and in particular to a step-down power supply starting circuit and a patrol robot. BACKGROUND

[0002] The existing step-down power supply starting circuit applied to a circuit board mainly adopts a step-down DCDC power supply module, which can directly start under the working condition of a large current load. Or, the step-down DCDC power supply module and a linear voltage regulator are combined to start the power supply first and then start the load, so that the load in the rear stage is normally powered on. However, the step-down DCDC power supply module can only be used in conventional application scenarios, and the use place is less.

[0003] However, the power supply starting circuit designed by using the step-down DCDC power supply module and controlled by pure hardware cannot continue to complete the starting of the power supply after the hardware soft starting circuit fails, and the starting mode is single. Moreover, the price of the DCDC power supply module is high, and the DCDC module can only be returned to the manufacturer for repair or directly replaced after being damaged. In addition, considering the heat dissipation problem, the DCDC power supply module needs to be integrated with a heat sink, thereby resulting in a large size of the DCDC power supply module. This is not conducive to the design of the circuit board card in some special occasions, such as the case where the circuit board card requires small and precise size. Moreover, the commonly integrated DCDC power supply module has a large design power, and the economy is poor for some low-voltage and large-current load conditions. The selection type is difficult, and the heat treatment problem needs to be considered. SUMMARY

[0004] The present application provides a step-down power supply starting circuit and a patrol robot to solve the problems of single starting mode, high implementation cost, large occupied space, and limited application scenarios of the existing power supply starting circuit based on the DCDC power supply module.

[0005] The present application is achieved by a step-down power supply starting circuit, which comprises a step-down power supply chip module, a current limiting module, an energy storage module, a hardware control module, and a software control module.

[0006] The input end of the step-down power supply chip module is connected to an input power supply as the input end of the step-down power supply starting circuit.

[0007] The output end of the step-down power supply chip module is connected to the input end of the current limiting module, the first end of the hardware control module, and the first end of the software control module.

[0008] The output end of the current limiting module is connected to the input end of the energy storage module.

[0009] The second end of the hardware control module is connected with an input power supply; the second end of the software control module is connected with a controller; the third end of the hardware control module, the third end of the software control module and the output end of the energy storage module are collectively used as an output end of the step-down power supply starting circuit;

[0010] The step-down power supply chip module is used for receiving a power supply voltage, performing step-down processing on the power supply voltage and obtaining a preset voltage signal.

[0011] The hardware control module is used for generating a starting signal according to the power supply voltage, forming a current loop under the starting signal and the voltage signal and providing a current to a subsequent load.

[0012] The software control module is used for receiving an opening and closing instruction from the controller, generating a starting signal according to the voltage signal under the opening and closing instruction, forming a current loop under the starting signal and the voltage signal and providing a current to a subsequent load.

[0013] The current limiting module is used for controlling a current signal to the subsequent load in a soft starting range of the step-down power supply chip module.

[0014] The energy storage module is used for storing an electric quantity and supplementing an electric quantity to a load when the current loop formed by the hardware control module cannot provide a preset electric quantity.

[0015] Optionally, the hardware control module comprises a hardware control unit and a first switch tube.

[0016] The input end of the hardware control unit is connected with an input power supply and the output end is connected with the control end of the first switch tube.

[0017] The input end of the first switch tube is connected with the output end of the step-down power supply chip module.

[0018] The output end of the first switch tube is used as an output end of the power supply starting circuit.

[0019] The hardware control unit is used for generating a starting signal of the first switch tube according to the power supply voltage.

[0020] The first switch tube is used for conducting when receiving the voltage signal output by the step-down power supply chip module and the starting signal and providing a large current loop to a subsequent load.

[0021] Optionally, the hardware control unit is composed of voltage dividing resistors connected in series.

[0022] Optionally, the software control module comprises a software control unit and a second switch tube.

[0023] The input end of the power supply of the software control unit and the input end of the second switch tube are connected to the output end of the step-down power supply chip module;

[0024] The signal input end of the software control unit is connected to the controller, and the signal output end is connected to the control end of the second switch tube;

[0025] The output end of the second switch tube serves as the output end of the power supply starting circuit;

[0026] The software control unit is used to receive an opening and closing instruction from the controller, and generate a starting signal of the second switch tube according to the voltage signal under the opening and closing instruction; the second switch tube is used to turn on when receiving the voltage signal and the starting signal, and provide a large current loop to the rear-stage load.

[0027] Optionally, the software control unit comprises an optoelectronic coupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a triode;

[0028] The first resistor and the second resistor are connected in series between the output end of the step-down power supply chip module and the fourth end of the optoelectronic coupler, and the series connection point serves as the signal output end of the software control unit and is connected to the control end of the second switch tube;

[0029] The third resistor is connected in series between the working voltage and the first end of the optoelectronic coupler;

[0030] The fourth resistor is connected in series between the controller and the base of the triode, and the fifth resistor is connected in series between the base and the emitter of the triode;

[0031] The collector of the triode is connected to the second end of the optoelectronic coupler;

[0032] The third end of the optoelectronic coupler is grounded.

[0033] Optionally, the step-down power supply chip module comprises a bypass capacitor module, a power supply chip circuit, a step-down circuit, and a decoupling capacitor module;

[0034] The input end of the bypass capacitor module and the input power supply positive end VIN of the power supply chip circuit are connected to the input power supply;

[0035] The output end of the power supply chip circuit is connected to the step-down circuit;

[0036] The output end of the step-down circuit is connected to the decoupling capacitor module;

[0037] The bypass capacitor module is used to lead noise in the input power supply to the ground;

[0038] The power supply chip circuit and the step-down circuit are used for receiving a power supply voltage, performing step-down processing on the power supply voltage, and obtaining a preset voltage signal.

[0039] The decoupling capacitor module is used for eliminating interference components in the voltage signal.

[0040] Optionally, the power supply chip circuit comprises a power supply chip, a first capacitor, a second capacitor, a third capacitor, a sixth resistor, and a seventh resistor.

[0041] The first capacitor is connected in series between a bias adjustment output end VCC of the power supply chip and a ground end GND.

[0042] The second capacitor is connected in series between a soft start end SS of the power supply chip and the ground end GND.

[0043] The third capacitor is connected in series between a ramp control signal end RAMP of the power supply chip and the ground end GND.

[0044] The sixth resistor is connected in series between an internal oscillator frequency setting end RT of the power supply chip and the ground end GND.

[0045] The seventh resistor is connected in series between a shutdown and low power consumption control end SD of the power supply chip and a working voltage 3.3V.

[0046] The step-down circuit comprises a fourth capacitor, an inductor, a diode, a fifth capacitor, a sixth capacitor, an eighth resistor, a ninth resistor, and a tenth resistor.

[0047] A first end of the fourth capacitor is connected to a bootstrap capacitor boost input end BST of the power supply chip.

[0048] A second end of the fourth capacitor, a first end of the inductor, and a negative electrode of the diode are commonly connected to a bootstrap capacitor pre-charge auxiliary end PRE and a switch node end SW of the power supply chip; and a second end of the inductor is connected to an output end of the power supply chip.

[0049] A positive electrode of the diode is connected to a current sensing end IS of the power supply chip.

[0050] The ninth resistor and the tenth resistor are connected in series between the output end of the power supply chip and the ground, and a series connection point is connected to a regulation feedback signal end FB of the power supply chip.

[0051] One end of the eighth resistor is connected to an internal error amplifier output end COMP of the power supply chip, and the other end is connected to one end of the fifth capacitor.

[0052] The other end of the fifth capacitor is connected to the regulation feedback signal end FB of the power supply chip.

[0053] The sixth capacitor is connected in series between the internal error amplifier output terminal COMP and the regulation feedback signal terminal FB of the power supply chip.

[0054] Optionally, the current limiting module is composed of a plurality of current limiting resistors connected in parallel.

[0055] Optionally, the energy storage module is composed of a plurality of energy storage capacitors connected in parallel.

[0056] A patrol robot comprises the step-down power supply starting circuit.

[0057] The step-down power supply starting circuit provided by the present application can still take over the control of the starting of the power supply starting circuit through software after the hardware control fails, the starting mode is flexible, the circuit uses a power supply chip, and the price is low; and the current limiting module and the energy storage module are added before the load in the later stage of the step-down voltage conversion module, the current required by the load is limited by the current limiting module, hardware damage caused by overcurrent in the power-on instant is prevented, the later stage of the step-down power supply starting circuit can start with the load, and the working occasion is wide. BRIEF DESCRIPTION OF DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0059] Figure 1 is a schematic diagram of the step-down power supply starting circuit provided by an embodiment of the present application;

[0060] Figure 2 is a schematic diagram of the step-down power supply chip module provided by an embodiment of the present application;

[0061] Figure 3 is a schematic diagram of the hardware control module provided by an embodiment of the present application;

[0062] Figure 4 is a schematic diagram of the software control module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0064] The application provides a step-down power supply starting circuit, which combines software and hardware to realize starting of the power supply starting circuit, and can still take over control of starting of the power supply starting circuit through software after hardware failure; the circuit adopts a power supply chip instead of a DCDC power supply module which is a large integrated module, the power supply chip is lower in price than the DCDC power supply module, occupies a small space, does not affect the size requirement of a circuit board, and can adapt to more use scenarios; and a current limiting module and an energy storage module are added before a load in the later stage of a step-down voltage conversion module, the current limiting module is used to limit current required by the load, to prevent overcurrent from causing hardware damage in the power-on moment, so that the step-down power supply starting circuit can start with a load in the later stage, and is suitable for a wide range of working occasions.

[0065] Figure 1 A schematic diagram of a step-down power supply starting circuit is provided for the embodiment of the application. Figure 1 As shown in the figure, the step-down power supply starting circuit comprises a step-down power supply chip module 10, a current limiting module 20, an energy storage module 30, a hardware control module 40 and a software control module 50.

[0066] An input end of the step-down power supply chip module 10 is connected to an input power supply as an input end of the step-down power supply starting circuit.

[0067] An output end of the step-down power supply chip module 10 is connected to an input end of the current limiting module 20, a first end of the hardware control module 40 and a first end of the software control module 50.

[0068] An output end of the current limiting module 20 is connected to an input end of the energy storage module 30.

[0069] A second end of the hardware control module 40 is connected to an input power supply, a second end of the software control module 50 is connected to a controller, and a third end of the hardware control module 40, a third end of the software control module 50 and an output end of the energy storage module 30 are collectively used as an output end of the step-down power supply starting circuit.

[0070] The step-down power supply chip module 10 is used to receive a power supply voltage, perform step-down processing on the power supply voltage, and obtain a preset voltage signal.

[0071] The hardware control module 40 is used to generate a starting signal according to the power supply voltage, form a current loop under the starting signal and the voltage signal, and provide current to a load in the later stage.

[0072] The software control module 50 is used to receive an opening and closing instruction from the controller, generate a starting signal according to the voltage signal under the opening and closing instruction, form a current loop under the starting signal and the voltage signal, and provide current to a load in the later stage.

[0073] The current limiting module 20 is used to control the current signal to the subsequent load within the soft start range of the step-down power supply chip module.

[0074] The energy storage module 30 is used to store electric quantity and supplement the required electric quantity to the load when the current loop formed by the hardware control module cannot provide the preset electric quantity.

[0075] In the embodiment of the present application, the step-down power supply starting circuit includes hardware control and software control. The power supply voltage is received by the step-down power supply chip module, and a stable voltage signal is obtained by step-down processing the power supply voltage. The voltage signal is provided to the hardware control module 40 and the software control module 50. The hardware control module 40 generates a starting signal according to the power supply voltage, and a current loop is formed under the starting signal and the voltage signal. Large current can be output to the output end of the power supply starting circuit through the current loop, thereby realizing the starting of the power supply with large current load. The software control module 50 receives the opening and closing instruction from the controller. The opening and closing instruction is the closing instruction of the current loop. A starting signal is generated according to the voltage signal under the opening and closing instruction, and a current loop is formed under the starting signal. Large current can be output to the output end of the power supply starting circuit through the current loop, thereby realizing the starting of the power supply with large current load. In this embodiment, the starting of the power supply starting circuit is realized by combining software and hardware. After the hardware fails, the software can still take over the control of the starting of the power supply starting circuit. The circuit uses a power supply chip, and the price of the power supply chip is lower than that of the DCDC power supply module. The use of the high-integration and large-size DCDC power supply module is avoided. The circuit occupies a small space and does not affect the size requirement of the circuit board card, and can be applied to more scenes.

[0076] Further, in this embodiment, the function of the current limiting module 20 is to control the current value to the subsequent load within the soft start range, so as to ensure that the overcurrent mechanism of the step-down power supply chip module is not triggered. The function of the energy storage module 40 is to store electric quantity, so as to supplement the required electric quantity to the load when the current loop formed by the hardware control module cannot provide the preset electric quantity. By adding the current limiting module 30 and the energy storage module 40 after the step-down power supply chip module and before the load, the current required by the load is limited by the current limiting module 30, so as to prevent the hardware from being damaged due to overcurrent at the power-on moment. The subsequent stage of the step-down power supply starting circuit can start with load, and is suitable for a wide range of working occasions.

[0077] As an example, Figure 2 A schematic diagram of a step-down power supply chip module provided by another embodiment of the present application is shown in FIG. 2. Figure 2 As shown in FIG. 2, the step-down power supply chip module 10 includes a bypass capacitor module 11, a power supply chip circuit 12, a step-down circuit 13, and a decoupling capacitor module 14.

[0078] The input terminal of the bypass capacitor module 11 and the positive input power terminal VIN of the power chip circuit 12 are connected to the input power supply.

[0079] The output terminal of the power chip circuit 12 is connected to the step-down circuit 13;

[0080] The output terminal of the step-down circuit 13 is connected to the decoupling capacitor module 14;

[0081] The bypass capacitor module 11 is used to draw noise from the input power supply to ground.

[0082] The power chip circuit 12 and the step-down circuit 13 are used to receive the power supply voltage, step down the power supply voltage, and obtain a preset voltage signal.

[0083] The decoupling capacitor module 14 is used to remove interference components from the voltage signal.

[0084] In this embodiment, the bypass capacitor module 11 is located at the input terminal and consists of several filter capacitors connected in parallel. It is used to bypass additional noise from the input power supply and route it to ground. As a preferred example of the present invention, in... Figure 2 In the example shown, the bypass capacitor module 11 is composed of two filter capacitors connected in parallel.

[0085] The decoupling capacitor module 14 is located at the output terminal and consists of several filter capacitors connected in parallel. It is used to remove interference components from the output voltage signal and decouple it to ground. As a preferred example of the present invention, in... Figure 2 In the example shown, the decoupling capacitor module 14 is composed of four filter capacitors connected in parallel.

[0086] The power chip circuit 12 uses a power chip and is combined with a step-down circuit 13 to receive the power supply voltage and step down the power supply voltage to obtain a preset voltage signal.

[0087] As a preferred example of the present invention, such as Figure 2 As shown, the power chip circuit 12 includes a power chip U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a sixth resistor R6, and a seventh resistor R7.

[0088] The first capacitor C1 is connected in series between the bias adjustment output terminal VCC of the power chip U1 and the ground terminal GND.

[0089] The second capacitor C2 is connected in series between the soft-start terminal SS and the ground terminal GND of the power chip U1;

[0090] The third capacitor C3 is connected in series between the ramp control signal end RAMP and the ground end GND of the power supply chip U1.

[0091] The sixth resistor R6 is connected in series between the internal oscillator frequency setting end RT and the ground end GND of the power supply chip U1.

[0092] The seventh resistor R7 is connected in series between the shutdown and low power consumption control end SD and the working voltage 3.3V of the power supply chip U1.

[0093] The step-down circuit 13 comprises a fourth capacitor C4, an inductor L, a diode D, a fifth capacitor C5, a sixth capacitor C6, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10.

[0094] The first end of the fourth capacitor C4 is connected to the bootstrap capacitor boost input end BST of the power supply chip U1.

[0095] The second end of the fourth capacitor C4, the first end of the inductor L, and the negative pole of the diode D are connected to the bootstrap capacitor pre-charge auxiliary end PRE and the switch node end SW of the power supply chip U1; the second end of the inductor L is connected to the output end OUT of the power supply chip U1.

[0096] The positive pole of the diode D is connected to the current sensing end IS of the power supply chip U1.

[0097] The ninth resistor R9 and the tenth resistor R10 are connected in series between the output end OUT of the power supply chip U1 and the ground, and the series connection point is connected to the regulation feedback signal end FB of the power supply chip U1.

[0098] One end of the eighth resistor R8 is connected to the internal error amplifier output end COMP of the power supply chip U1, and the other end is connected to one end of the fifth capacitor C5.

[0099] The other end of the fifth capacitor C5 is connected to the regulation feedback signal end FB of the power supply chip U1.

[0100] The sixth capacitor C6 is connected in series between the internal error amplifier output end COMP and the regulation feedback signal end FB of the power supply chip U1.

[0101] In the embodiment, the input power positive terminal VIN of the power supply chip U1 receives an input voltage, such as 48V input voltage, and outputs a 12V voltage signal after the power supply chip U1 and the step-down circuit 13. It should be understood that the input voltage 48V and the output voltage signal 12V are only a typical application example of the embodiment, and in other embodiments, the input voltage and the output voltage signal can be changed by replacing the power supply chip U1 and adjusting the feedback resistors in the step-down circuit 13, i.e., the ninth resistor R9 and the tenth resistor R10.

[0102] In the embodiment, if the instantaneous current value delivered is too large, the power supply chip U1 will start the protection mechanism, causing the entire step-down power supply starting circuit to be unavailable. In view of this, the current limiting module 20 is added in the embodiment, which controls the current value delivered by the front-stage power supply chip U1 and the step-down circuit 13 to the rear stage when the rear-stage load current instantaneously demands a large current, which generally occurs when a large load is started or the power of the rear-stage consumer suddenly increases. In the embodiment, the current limiting module 20 is composed of a plurality of current limiting resistors connected in parallel. As a preferred example of the present application, the current limiting module 20 is composed of four current limiting resistors connected in parallel, as shown in Figure 2 It should be understood that the number, resistance value, and package of the current limiting resistors are not limited, the number depends on the layout space and heat dissipation conditions, the resistance value depends on the current limiting value and the overcurrent condition, and the package depends on the overcurrent value and the power size.

[0103] Optionally, the energy storage module 30 is added in the embodiment, which is charged by the small current of the power supply chip U1 in the path of the front-stage step-down circuit without protection before the software control module 50 or the hardware control module 40 is turned on. When the path of one of the software control module 50 or the hardware control module 40 is turned on, the energy storage module 30 can act as a battery to relieve part of the pressure of the step-down circuit 13 outputting V_Output to the rear stage, so that the power required by the step-down circuit 13 is reduced, avoiding the power supply chip U1 triggering protection. In the embodiment, the energy storage module 30 is composed of a plurality of energy storage capacitors connected in parallel. As a preferred example of the present application, the energy storage module 30 is composed of six energy storage capacitors connected in parallel. It should be understood that the number and capacitance value of the energy storage capacitors are not limited, the number depends on the layout space and the power supply and timeliness requirements, and the capacitance value depends on the power supply amount.

[0104] As an example, Figure 3 A schematic diagram of the hardware control module provided for another embodiment of the present application is shown in Figure 3 As shown in the figure, the hardware control module 40 includes a hardware control unit 41 and a first switch tube M1.

[0105] The input end of the hardware control unit 41 is connected with an input power supply, and the output end is connected with the control end G of the first switch tube M1;

[0106] The input end D of the first switch tube M1 is connected with the output end of the step-down power supply chip module 10;

[0107] The output end S of the first switch tube M1 is used as the output end of the power supply starting circuit;

[0108] The hardware control unit 41 is used for generating a starting signal of the first switch tube M1 according to the power supply voltage;

[0109] The first switch tube M1 is used for turning on when receiving the voltage signal output by the step-down power supply chip module 10 and the starting signal, and providing a large current loop to the rear-stage load.

[0110] Optionally, the hardware control unit 41 is composed of voltage dividing resistors connected in series.

[0111] In the embodiment, the power supply voltage can be, for example, 48V, and the first switch tube M1 can be an NMOS tube. The hardware control unit 41 is composed of two voltage dividing resistors connected in series. After the power supply voltage passes through the voltage dividing resistors of the hardware control unit 41, a voltage of 36V is output to control the G end of the first switch tube M1. After the power supply voltage passes through the step-down power supply chip module 10, a voltage of 12V is output to control the S end of the first switch tube M1. At this time, the first switch tube M1 turns on, and a large current can be output to the output end of the power supply starting circuit through the loop in which the first switch tube M1 is located, so that the power supply starting with a large current of the load is realized, and the application is suitable for a wide range of working occasions.

[0112] As an example, Figure 4 The schematic diagram of the software control module provided by another embodiment of the application is shown in the figure. Figure 4 As shown in the figure, the software control module 50 includes a software control unit 51 and a second switch tube M2;

[0113] The power supply input end of the software control unit 51 and the input end S of the second switch tube M2 are connected with the output end of the step-down power supply chip module 10;

[0114] The signal input end of the software control unit 51 is connected with a controller, and the signal output end is connected with the control end G of the second switch tube M2;

[0115] The output end D of the second switch tube M2 is used as the output end of the power supply starting circuit;

[0116] The software control unit 51 is configured to receive an opening and closing instruction from a controller, and generate an enabling signal of the second switch tube M2 according to the voltage signal under the opening and closing instruction; the second switch tube M2 is configured to be turned on when receiving the voltage signal and the enabling signal, and provide a large current loop to a rear-stage load.

[0117] Optionally, the software control unit 51 comprises an optoelectronic coupler U2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R6, and a triode TV.

[0118] The first resistor R1 and the second resistor R2 are connected in series between an output end of the step-down power supply chip module 10 and a fourth end of the optoelectronic coupler U2, and a series connection point is connected to a control end G of the second switch tube M2 as a signal output end of the software control unit 51.

[0119] The third resistor R3 is connected in series between a working voltage and a first end of the optoelectronic coupler U2.

[0120] The fourth resistor R4 is connected in series between a controller and a base of the triode TV, and the fifth resistor R5 is connected in series between the base and an emitter of the triode TV.

[0121] A collector of the triode TV is connected to a second end of the optoelectronic coupler U2.

[0122] A third end of the optoelectronic coupler U2 is grounded.

[0123] In the embodiment, the power supply voltage can be, for example, 48V, and the second switch tube M2 can be a PMOS tube. The power supply voltage is output as 12V after passing through the step-down power supply chip module 10, and controls an S end of the second switch tube M2; when the controller sends an opening and closing instruction to the optoelectronic coupler U2, the optoelectronic coupler U2 is closed, a loop in which the first resistor R1 and the second resistor R2 are located is turned on, 12V is divided to output 2V to control a G end of the second switch tube M2, at this time, the second switch tube M2 is turned on, and a large current can be output to an output end of the power supply starting circuit through a loop in which the second switch tube M2 is located, so that the power supply starting with a large current of a load is realized, and the application is suitable for a wide working occasion.

[0124] The application provides a step-down power supply starting circuit, which is realized by combining software and hardware to start the power supply circuit, and when the hardware control fails, the software control can continue to realize the starting of the power supply circuit, the software and hardware control do not interfere with each other, the starting mode is rich, and the working occasion is wide. The hardware control adopts NMOS, the body diode of the NMOS cannot be turned on at the power-on moment, and can prevent a large current from passing through the body diode; the power supply chip is combined, the volume is smaller than that of the prior art DCDC power supply module, the circuit board card space is small, the design of the circuit board card is not affected, and the power supply chip is lower in price than the DCDC power supply module, and in the aspect of maintenance cost, the power supply starting circuit designed by using the power supply chip is lower than the power supply starting circuit designed by using the DCDC power supply module. Further, the application adds a current limiting module and an energy storage module to the rear stage of the power supply chip and the step-down circuit and the front stage of the load, the current limiting module is used to limit the current required by the load, the current to the rear load is controlled, and a large current loop is formed by the PMOS and the NMOS, so that the load can be started after the power supply is completely started.

[0125] The application also provides a patrol robot, which comprises the step-down power supply starting circuit.

[0126] The above-described embodiments are only used to illustrate the technical solutions of the application, rather than limit them; although the application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; the modification or replacement does not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the application, and should be included in the protection scope of the application.

Claims

1. A step-down power supply starting circuit, characterized by comprising: The step-down power supply starting circuit comprises a step-down power supply chip module, a current limiting module, an energy storage module, a hardware control module and a software control module. An input end of the step-down power supply chip module is connected to an input power supply as an input end of the step-down power supply starting circuit. Output ends of the step-down power supply chip module are respectively connected to an input end of the current limiting module, a first end of the hardware control module and a first end of the software control module. An output end of the current limiting module is connected to an input end of the energy storage module. A second end of the hardware control module is connected to an input power supply, a second end of the software control module is connected to a controller, and a third end of the hardware control module, a third end of the software control module and an output end of the energy storage module are collectively used as an output end of the step-down power supply starting circuit. The step-down power supply chip module is used to receive a power supply voltage, perform step-down processing on the power supply voltage and obtain a preset voltage signal. The hardware control module is used to generate a starting signal according to the power supply voltage, form a current loop under the starting signal and the voltage signal and provide a current to a subsequent load. The software control module is used to receive an opening and closing instruction from a controller, generate a starting signal according to the voltage signal under the opening and closing instruction, form a current loop under the starting signal and the voltage signal and provide a current to a subsequent load. The current limiting module is used to control a current signal to the subsequent load within a soft starting range of the step-down power supply chip module. The energy storage module is used to store an electric quantity and supplement an electric quantity to a load when a current loop formed by the hardware control module cannot provide a preset electric quantity.

2. The start-up circuit for a step-down power supply according to claim 1, wherein The hardware control module comprises a hardware control unit and a first switch tube. An input end of the hardware control unit is connected to an input power supply, and an output end of the hardware control unit is connected to a control end of the first switch tube. An input end of the first switch tube is connected to an output end of the step-down power supply chip module. An output end of the first switch tube is used as an output end of the step-down power supply starting circuit. The hardware control unit is used to generate a starting signal of the first switch tube according to the power supply voltage. The first switch tube is used to be turned on when receiving the voltage signal output by the step-down power supply chip module and the starting signal, and provide a large current loop to a subsequent load.

3. The step-down power supply starting circuit according to claim 2, wherein The hardware control unit is composed of voltage dividing resistors connected in series.

4. The step-down power supply starting circuit according to claim 1, wherein The software control module comprises a software control unit and a second switch tube. An input end of the software control unit and an input end of the second switch tube are connected to an output end of the step-down power supply chip module. A signal input end of the software control unit is connected to a controller, and a signal output end of the software control unit is connected to a control end of the second switch tube. An output end of the second switch tube is used as an output end of the step-down power supply starting circuit. The software control unit is used to receive an opening and closing instruction from a controller, generate a starting signal of the second switch tube according to the voltage signal under the opening and closing instruction, and the second switch tube is used to be turned on when receiving the voltage signal and the starting signal, and provide a large current loop to a subsequent load.

5. The step-down power supply starting circuit according to claim 4, wherein The software control unit comprises a photoelectric coupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a triode; The first resistor and the second resistor are connected in series between the output end of the step-down power supply chip module and the fourth end of the photoelectric coupler, and the connection point is connected to the control end of the second switch tube as the signal output end of the software control unit; The third resistor is connected in series between the working voltage and the first end of the photoelectric coupler; The fourth resistor is connected in series between the controller and the base of the triode, and the fifth resistor is connected in series between the base and the emitter of the triode; The collector of the triode is connected to the second end of the photoelectric coupler; The third end of the photoelectric coupler is grounded.

6. The step-down power supply starting circuit according to any one of claims 1 to 5, wherein The step-down power supply chip module comprises a bypass capacitor module, a power supply chip circuit, a step-down circuit and a decoupling capacitor module; The input end of the bypass capacitor module is connected to the input power supply positive end of the power supply chip circuit; The output end of the power supply chip circuit is connected to the step-down circuit; The output end of the step-down circuit is connected to the decoupling capacitor module; The bypass capacitor module is used to lead the noise in the input power supply to the ground; The power supply chip circuit and the step-down circuit are used to receive a power supply voltage, perform step-down processing on the power supply voltage, and obtain a preset voltage signal; The decoupling capacitor module is used to eliminate the interference components in the voltage signal.

7. The step-down power supply starting circuit according to claim 6, wherein The power supply chip circuit comprises a power supply chip, a first capacitor, a second capacitor, a third capacitor, a sixth resistor and a seventh resistor; The first capacitor is connected in series between the bias adjustment output end of the power supply chip and the ground end GND; The second capacitor is connected in series between the soft start end of the power supply chip and the ground end GND; The third capacitor is connected in series between the ramp control signal end of the power supply chip and the ground end GND; The sixth resistor is connected in series between the internal oscillator frequency setting end of the power supply chip and the ground end GND; The seventh resistor is connected in series between the shutdown and low power consumption control end of the power supply chip and the working voltage 3.3V; The step-down circuit comprises a fourth capacitor, an inductor, a diode, a fifth capacitor, a sixth capacitor, an eighth resistor, a ninth resistor and a tenth resistor; The first end of the fourth capacitor is connected to the bootstrap capacitor boost input end of the power supply chip; The second end of the fourth capacitor, the first end of the inductor and the negative electrode of the diode are commonly connected to the bootstrap capacitor precharge auxiliary end and the switch node end of the power supply chip; the second end of the inductor is connected to the output end of the power supply chip; The positive electrode of the diode is connected to the current sensing end of the power supply chip; The ninth resistor and the tenth resistor are connected in series between the output end of the power supply chip and the ground, and the connection point is connected to the adjustment feedback signal end of the power supply chip; One end of the eighth resistor is connected to the internal error amplifier output end of the power supply chip, and the other end is connected to one end of the fifth capacitor; The other end of the fifth capacitor is connected to the adjustment feedback signal end of the power supply chip; The sixth capacitor is connected in series between the internal error amplifier output end and the adjustment feedback signal end of the power supply chip.

8. The step-down power supply starting circuit according to any one of claims 1 to 5, wherein The current limiting module is composed of a plurality of current limiting resistors connected in parallel.

9. The step-down power supply starting circuit according to any one of claims 1 to 5, wherein The energy storage module is composed of several energy storage capacitors connected in parallel.

10. A patrol robot, characterized in that it comprises a step-down power start-up circuit according to any one of claims 1 to 9.

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