Controllable power supply circuit with protection

Abstract

The utility model discloses a controllable power supply circuit with protection, which comprises a central control circuit, a first power supply circuit, a second power supply circuit and a voltage-stabilizing filtering time-delay circuit, the input ends of the first power supply circuit and the second power supply circuit are respectively connected with an external power supply, and the output end of the first power supply circuit is connected with the input end of the voltage-stabilizing filtering time-delay circuit. The first power supply circuit is used for reducing voltage input by an external power supply so that output voltage of the first power supply circuit is smaller than or equal to a voltage threshold value, and the voltage stabilization filtering time-delay circuit is used for carrying out voltage stabilization filtering on the voltage output by the first power supply circuit and outputting the voltage after time delay. The output end of the voltage-stabilizing filtering time-delay circuit serves as the output end of the controllable power supply circuit, the output end of the second power supply circuit is connected with the central control circuit, and the second power supply circuit is used for inputting specific voltage to the central control circuit after reducing the access voltage. According to the utility model, power supply can be controlled according to needs, the application scene is wider, and the user experience sensitivity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, in particular to a controllable power supply circuit with protection. Background Art

[0002] Some electronic devices or electronic components or circuits need power supply, but not necessarily continuous power supply. Instead, they need to be powered on after the trigger conditions are met, and the power supply is cut off if the trigger conditions are not met. In other words, a controllable power supply circuit is needed, so that the power receiving target can receive power as needed. Existing power supply circuits often provide continuous power supply and cannot provide power in a controllable manner. In addition, existing power supply circuits often do not have protection functions, do not have overvoltage protection, or require complex circuits to achieve overvoltage protection. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a controllable power supply circuit with protection, which can solve the problems described in the background technology.

[0004] The technical solution for achieving the purpose of the utility model is: a controllable power supply circuit with protection, including a central control circuit, a first power supply circuit, a second power supply circuit and a voltage stabilizing filter delay circuit, the input ends of the first power supply circuit and the second power supply circuit are respectively connected to an external power supply, the output end of the first power supply circuit is connected to the input end of the voltage stabilizing filter delay circuit, the first power supply circuit is used to step down the voltage input by the external power supply so that the output voltage of the first power supply circuit is ≤ the voltage threshold, the voltage stabilizing filter delay circuit is used to perform voltage stabilizing filtering on the voltage output by the first power supply circuit and output it after delay, the output end of the voltage stabilizing filter delay circuit serves as the output end of the controllable power supply circuit, and is used to supply power to the target, the output end of the second power supply circuit is connected to the central control circuit, and the second power supply circuit is used to step down the access voltage and input a specific voltage to the central control circuit to supply power to the central control circuit.

[0005] Further, the first power supply circuit includes a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C7, a capacitor C8, a resistor R1, a resistor R2, a resistor R5, a resistor R19, a diode D1, a light-emitting diode D2 and a buck chip U1, one end of the capacitor C3, one end of the resistor R2, an input pin VIN of the buck chip U1 and a power pin VCC are connected together and serve as an input end of the first power supply circuit, the other end of the capacitor C3 is grounded, the other end of the resistor R2 is respectively connected to the VOVP pin of the buck chip U1, one end of the resistor R5, one end of the capacitor C7, and one end of the capacitor C8, the other end of the resistor R5, The other end of capacitor C7 and the other end of capacitor C8 are grounded respectively, the enable pin EN of the buck chip U1 is connected to the central control circuit and one end of the resistor R19 respectively, the other end of the resistor R19 is grounded, the output pin VOUT of the buck chip U1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to one end of the capacitor C4, one end of the capacitor C5, and one end of the resistor R1 in sequence, and the commonly connected connection node serves as the output end of the first power supply circuit, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded, the other end of the resistor R1 is connected to the positive electrode of the light-emitting diode D2, and the negative electrode of the light-emitting diode D2 is grounded.

[0006] Further, the voltage stabilizing filter delay circuit includes a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a light emitting diode D4, an inductor L2 and a voltage stabilizing chip U4, one end of the capacitor C21, one end of the capacitor C22, one end of the resistor R13, and an input pin VIN of the voltage stabilizing chip U4 are connected together and serve as the input end of the voltage stabilizing filter delay circuit, the other end of the capacitor C21 and the other end of the capacitor C22 are grounded respectively, one end of the resistor R13 is connected together with an enable pin EN of the voltage stabilizing chip U4 and connected in series with the capacitor C23 and then grounded, the ground pin GND of the voltage stabilizing chip U4 is grounded, the pin LX of the voltage stabilizing chip U4, one end of the capacitor C17 and one end of the inductor L2 are connected together, the other end of the capacitor C17 is connected to the voltage stabilizing chip U 4, the other end of the inductor L2 is connected to one end of the capacitor C18, one end of the capacitor C19, one end of the capacitor C20, one end of the resistor R14, one end of the resistor R15 and one end of the resistor R16 in sequence, and the commonly connected connection node serves as the output end of the voltage stabilizing filter delay circuit, the other end of the capacitor C18 and the other end of the capacitor C19 are grounded respectively, the other end of the capacitor C20 is connected to the pin FB / OUT of the voltage stabilizing chip and the first connection node respectively, the first connection node is a connection node where the other end of the resistor R14 is connected to one end of the resistor R17, the other end of the resistor R17 is grounded, the other end of the resistor R15 is connected to the positive electrode of the light emitting diode D4, the negative electrode of the light emitting diode D4 is grounded, the resistor R16 is connected in series with the resistor R18 and then grounded, and the connection node between the resistor R16 and the resistor R18 is defined as a second connection node, and the second connection node is connected to the central control circuit.

[0007] Further, the second power supply circuit includes a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a resistor R6, a resistor R9, a resistor R10, a resistor R12, an inductor L1 and a power management chip U2, one end of the capacitor C12, one end of the capacitor C13, one end of the resistor R6 and an input pin VIN of the power management chip U2 are connected together and serve as the input end of the second power supply circuit, the other end of the capacitor C12 and the other end of the capacitor C13 are grounded respectively, the other end of the resistor R6 and the enable pin EN of the power management chip U2 are connected and connected in series with the resistor R9 and then grounded, and the ground pin G of the power management chip U2 is connected. ND is grounded, pin FB of the power management chip U2 is connected to the third connection node, the third connection node is the connection node between the resistor R10 and the resistor R12, pin BOOT of the power management chip U2 is connected in series with capacitor C11 and then connected to the control pin of the power management chip U2, and are commonly connected to one end of the inductor L1, the other end of the inductor L1 is connected in sequence to one end of capacitor C14, one end of capacitor C15, and one end of resistor R10, and the commonly connected connection node serves as the output end of the second power supply circuit, the other end of capacitor C14 and the other end of capacitor C15 are grounded respectively, and the other end of resistor R10 is connected in series with resistor R12 and then grounded.

[0008] Furthermore, the central control circuit includes a processor U3, a capacitor C9, a capacitor C10, a capacitor C16, a resistor R7, a resistor R8 and a resistor R11. The pin LDO_CAP of the processor U3 is connected in series with the capacitor C9 and then grounded. The first power pin VDD of the processor U3 is respectively connected to one end of the capacitor C10 and the output end of the second power supply circuit. The data pin 4 of the processor U3 is connected in series with the resistor R7 and then connected to the second connection node of the voltage stabilizing filter delay circuit. The data pin 5 of the processor U3 is connected in series with the resistor R8 and then serves as the access end UART1_RXD. The data pin 6 of the processor U3 is connected in series with the resistor R11 and then serves as the sending end UART1_TXD. The access end UART1_RXD and the sending end UART1_TXD are connected to the external instruction operation end to receive the sent signal and upload the feedback signal. The second power pin AVDD of the processor U3 is respectively connected to one end of the capacitor C16 and the output end of the second power supply circuit. The other end of the capacitor C16 is grounded. The data pin 15 of the processor U3 is connected to the enable pin EN of the buck chip U1 in the first power supply circuit.

[0009] Furthermore, an external power supply circuit is included, which includes a DC socket J1, a capacitor C1 and a capacitor C2. The DC socket J1 is used to connect to an external power supply. Pin 1 of the DC socket J1 is respectively connected to one end of the capacitor C1 and one end of the capacitor C2 and serves as the output of the external power supply circuit. The output end of the external power supply circuit is respectively connected to the input end of the first power supply circuit and the input end of the second power supply circuit. Pin 2 and pin 3 of the DC socket J1, the other end of the capacitor C1, and the other end of the capacitor C2 are connected and grounded together.

[0010] Furthermore, it also includes a switching circuit, which includes a resistor R3, a resistor R3, a capacitor C6, a diode D3 and a switch S1, one end of the resistor R4 is connected to the data pin 11 of the processor U3 in the central control circuit, the other end of the resistor R4 is respectively connected to one end of the capacitor C6, one end of the resistor R3, the cathode of the diode D3, and the contact 1 of the switch button S1, the other end of the capacitor C6 is grounded, the anode of the diode D3 is grounded, the other end of the diode D3 is connected to the output end of the second power supply circuit, and the contact 2 of the switch button S1 is grounded.

[0011] The beneficial effects of the utility model are as follows: the utility model can control whether to supply power to an external target as needed, thereby making the application scenarios of the controllable power supply circuit more extensive, improving the user experience sensitivity, and also has overvoltage protection, which can effectively prevent hazards such as burning caused by overvoltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a circuit diagram of the utility model;

[0013] Figure 2 is a circuit diagram of an external power supply circuit;

[0014] Figure 3 is a circuit diagram of a switch circuit;

[0015] Figure 4 is a circuit diagram of a first power supply circuit;

[0016] Figure 5 is a circuit schematic diagram of a second power supply circuit;

[0017] Figure 6 is a circuit diagram of a central control circuit;

[0018] Figure 7 This is the circuit diagram of the voltage stabilizing filter delay circuit. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific implementation schemes:

[0020] like Figure 1-Figure 7As shown, a controllable power supply circuit with protection includes a central control circuit, a first power supply circuit, a second power supply circuit and a voltage stabilizing filter delay circuit. The input ends of the first power supply circuit and the second power supply circuit are respectively connected to an external power supply to connect the external power supply to the controllable power supply circuit. The output end of the first power supply circuit is connected to the input end of the voltage stabilizing filter delay circuit. The first power supply circuit is used to step down the voltage input by the external power supply so that the output voltage of the first power supply circuit is ≤ the voltage threshold, thereby playing an overvoltage protection role. The voltage stabilizing filter delay circuit is used to perform voltage stabilizing filter on the voltage output by the first power supply circuit and output it after delay. The output end of the voltage stabilizing filter delay circuit serves as the output end of the controllable power supply circuit and is used to supply power to the target, for example, to supply power to the subsequent circuit or external device or external component. The output end of the second power supply circuit is connected to the central control circuit. The second power supply circuit is used to step down the access voltage and input a specific voltage to the central control circuit to supply power to the central control circuit.

[0021] The first power supply circuit includes capacitor C3, capacitor C4, capacitor C5, capacitor C7, capacitor C8, resistor R1, resistor R2, resistor R5, resistor R19, diode D1, light emitting diode D2 and buck chip U1, one end of capacitor C3, one end of resistor R2, input pin VIN and power pin VCC of buck chip U1 are connected together and serve as the input end of the first power supply circuit, the other end of capacitor C3 is grounded, the other end of resistor R2 is respectively connected to VOVP pin of buck chip U1, one end of resistor R5, one end of capacitor C7 and one end of capacitor C8, the other end of resistor R5, the other end of capacitor C7 and the other end of capacitor C8 are respectively grounded. Enable pin EN of buck chip U1 is respectively connected to central control circuit and one end of resistor R19, and the other end of resistor R19 is grounded. The output pin VOUT of the step-down chip U1 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to one end of the capacitor C4, one end of the capacitor C5, and one end of the resistor R1 in sequence, and the commonly connected connection node serves as the output end of the first power supply circuit, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded, the other end of the resistor R1 is connected to the anode of the light-emitting diode D2, and the cathode of the light-emitting diode D2 is grounded.

[0022] The voltage stabilizing filter delay circuit includes capacitor C17, capacitor C18, capacitor C19, capacitor C20, capacitor C21, capacitor C22, capacitor C23, resistor R13, resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, light emitting diode D4, inductor L2 and voltage stabilizing chip U4. One end of capacitor C21, one end of capacitor C22, one end of resistor R13 and input pin VIN of voltage stabilizing chip U4 are connected together and serve as the input end of the voltage stabilizing filter delay circuit, the other end of capacitor C21 and the other end of capacitor C22 are grounded respectively, one end of resistor R13 is connected together with enable pin EN of voltage stabilizing chip U4 and connected in series with capacitor C23 and then grounded. The ground pin GND of voltage stabilizing chip U4 is grounded. The pin LX of the voltage stabilizing chip U4, one end of the capacitor C17 and one end of the inductor L2 are connected together, the other end of the capacitor C17 is connected to the pin BS of the voltage stabilizing chip U4, the other end of the inductor L2 is connected to one end of the capacitor C18, one end of the capacitor C19, one end of the capacitor C20, one end of the resistor R14, one end of the resistor R15 and one end of the resistor R16 in sequence, and the commonly connected connection node is used as the output end of the voltage stabilizing filter delay circuit. The other end of the capacitor C18 and the other end of the capacitor C19 are grounded respectively. The other end of the capacitor C20 is connected to the pin FB / OUT of the voltage stabilizing chip and the first connection node respectively, the first connection node is the connection node where the other end of the resistor R14 is connected to one end of the resistor R17, the other end of the resistor R17 is grounded, the other end of the resistor R15 is connected to the positive electrode of the light emitting diode D4, the negative electrode of the light emitting diode D4 is grounded, the resistor R16 is connected in series with the resistor R18 and then grounded, and the connection node between the resistor R16 and the resistor R18 is defined as the second connection node, and the second connection node is connected to the central control circuit.

[0023] The second power supply circuit includes capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15, resistor R6, resistor R9, resistor R10, resistor R12, inductor L1 and power management chip U2, one end of capacitor C12, one end of capacitor C13, one end of resistor R6 and input pin VIN of power management chip U2 are connected together and serve as the input end of the second power supply circuit, the other end of capacitor C12 and the other end of capacitor C13 are grounded respectively, the other end of resistor R6 and enable pin EN of power management chip U2 are connected and connected in series with resistor R9 and then grounded. The ground pin GND of power management chip U2 is grounded, and the pin FB of power management chip U2 is connected to the third connection node, which is the connection node between resistor R10 and resistor R12. The pin BOOT of the power management chip U2 is connected in series with the capacitor C11 and then connected to the control pin (i.e., the pin SW) of the power management chip U2, and is commonly connected to one end of the inductor L1. The other end of the inductor L1 is sequentially connected to one end of the capacitor C14, one end of the capacitor C15, and one end of the resistor R10, and the commonly connected connection node serves as the output end of the second power supply circuit. The other end of the capacitor C14 and the other end of the capacitor C15 are grounded respectively, and the other end of the resistor R10 is connected in series with the resistor R12 and then grounded.

[0024] The central control circuit includes a processor U3, a capacitor C9, a capacitor C10, a capacitor C16, a resistor R7, a resistor R8 and a resistor R11, a pin LDO_CAP of the processor U3 is connected in series with the capacitor C9 and then grounded, a first power pin VDD of the processor U3 is connected to one end of the capacitor C10 and the output end of the second power supply circuit respectively, a data pin 4 (pin PB.14 in the figure) of the processor U3 is connected in series with the resistor R7 and then connected to the second connection node of the voltage stabilizing filter delay circuit. The data pin 5 (pin PB.13 in the figure) of the processor U3 is connected in series with the resistor R8 and then used as the access terminal UART1_RXD, the data pin 6 (pin PB.12 in the figure) of the processor U3 is connected in series with the resistor R11 and then used as the transmitting terminal UART1_TXD, the access terminal UART1_RXD and the transmitting terminal UART1_TXD are connected to the external instruction operation terminal to receive the signal sent and upload the relevant feedback signal. The second power pin AVDD of the processor U3 is connected in series with one end of the capacitor C16 and the output end of the second power supply circuit respectively, and the other end of the capacitor C16 is grounded. The data pin 15 (pin PA.2 in the figure) of the processor U3 is connected to the enable pin EN of the buck chip U1 in the first power supply circuit.

[0025] In an optional embodiment, an external power supply circuit is also included, which includes a DC socket J1, a capacitor C1 and a capacitor C2. The DC socket J1 is used to connect to an external power supply to access the external power supply. Pin 1 of the DC socket J1 is respectively connected to one end of the capacitor C1 and one end of the capacitor C2 and together serve as the output of the external power supply circuit. The output end of the external power supply circuit is respectively connected to the input end of the first power supply circuit and the input end of the second power supply circuit. Pin 2, pin 3 of the DC socket J1, the other end of the capacitor C1, and the other end of the capacitor C2 are connected and grounded together.

[0026] In an optional embodiment, a switching circuit is also included, which includes a resistor R3, a resistor R3, a capacitor C6, a diode D3 and a switch S1. One end of the resistor R4 is connected to the data pin 11 (pin PB.2 in the figure) of the processor U3 in the central control circuit, and the other end of the resistor R4 is respectively connected to one end of the capacitor C6, one end of the resistor R3, the cathode of the diode D3, and the contact 1 of the switch button S1. The other end of the capacitor C6 is grounded, the anode of the diode D3 is grounded, the other end of the diode D3 is connected to the output end of the second power supply circuit, and the contact 2 of the switch button S1 is grounded.

[0027] Working principle: When the first power supply circuit and the second power supply circuit are connected to the external power supply directly or through the external power supply circuit, the buck chip U1 and the power management chip U2 both have voltage input and can start working normally. Due to the effect of resistor R19, the enable pin EN on the buck chip U1 is in the enable-off state, so there is no voltage output at the output end of the first power supply circuit, and thus the voltage stabilizing filter delay circuit also has no voltage output, that is, the controllable power supply circuit has no voltage output. The enable pin EN on the power management chip U2 provides an enabling condition due to the voltage divider network composed of resistors R6 and R9. The enable pin EN on the power management chip U2 is in the enabled state, and there is voltage output at the output end of the second power supply circuit, so that the processor U3 of the central control circuit can be powered, and the processor U3 can work normally.

[0028] The data pin 11 of the processor U3 reads the control signal directly or through the switching circuit, and converts it into a control level according to the control signal. The control level is output to the enable pin EN of the buck chip U1 in the first power supply circuit through the data pin 15 of the processor U3, thereby controlling the state of the enable pin EN of the buck chip U1, which includes turning the enable pin EN on and off, thereby controlling the first power supply circuit to be powered on or off, that is, whether there is a voltage output, so that the voltage stabilizing filter delay circuit has a voltage output, so as to control whether the controllable power supply circuit supplies power according to demand.

[0029] Among them, the control signal can be a state coding signal of the switch button S1 or an infrared signal. The infrared signal is directly connected to the data pin 17 (PA.0 in the figure) of the processor U3 and input to the processor U3, that is, the data pin 17 of the processor U3 in the figure serves as the pin STATUC_LED for receiving the infrared signal.

[0030] In the first power supply circuit, capacitor C3 is an input filter capacitor, which can improve the anti-interference ability of pin VIIN and pin VCC of the buck chip U1. Resistors R2 and R5 form a voltage divider network, which can provide overvoltage protection. Its output voltage is used as the voltage threshold VIN_OVP, and satisfies the following relationship: VIN_OVP = 1.2*(1+R2+R5). If the divided voltage on pin 1 of the buck chip U1 exceeds the voltage threshold, the MOS tube inside the buck chip U1 is in the cut-off state, so that pin 3 of the buck chip U1 has no voltage output, thereby realizing the overvoltage protection function. Capacitors C7 and C8 play an anti-shake role to prevent interference from external high-frequency clutter.

[0031] In the second power supply circuit, the external power supply is input to pin 3 of the power management chip U2, and resistors R6 and R9 form a voltage divider network to meet the enable requirement of pin 5 of the power management chip U2. Capacitors C12 and C13 are input filter capacitors to improve the anti-interference ability of the relevant pins of the power management chip U2. Capacitor C11, inductor L1, capacitors C14 and C15 form an output voltage stabilization filter circuit, and resistors R10 and R12 form a voltage divider network to provide real-time voltage feedback for the power management chip U2, so that the power management chip U2 outputs a stable voltage.

[0032] In the voltage stabilizing filter delay circuit, pin 5 of the voltage stabilizing chip U4 is connected to the output end of the first power supply circuit, so that the voltage stabilizing chip U4 is controlled by the step-down chip U1 of the first power supply circuit. Capacitors C21 and C22 are input filter capacitors to improve the anti-interference ability of the relevant pins of the voltage stabilizing chip U4. Resistor R13 and capacitor C23 form a switch delay circuit to delay the output of the voltage stabilizing chip U4 and provide enabling conditions at the same time. Capacitor C17, inductor L2, capacitors C18, C19, and C20 form an output voltage stabilizing filter circuit, and resistors R14 and R17 form a voltage divider network to provide real-time voltage feedback for the voltage stabilizing chip U4, so that the voltage stabilizing chip U4 outputs a stable voltage. Resistor R15 and light-emitting diode D4 are used as indicators to indicate whether power is supplied to the external target. Resistor R16 and resistor R18 form a voltage divider network to provide real-time voltage feedback for the processor U3, so that the processor U3 knows whether the target is powered on normally.

[0033] The utility model can control whether to supply power to an external target as needed, thereby making the application scenarios of the controllable power supply circuit wider and improving the user experience sensitivity. It also has overvoltage protection, which can effectively prevent hazards such as burning caused by overvoltage.

[0034] The embodiment disclosed in this specification is only an example of the unilateral features of the utility model, and the protection scope of the utility model is not limited to this embodiment. Any other functionally equivalent embodiments fall within the protection scope of the utility model. For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. A controllable power supply circuit with protection, It is characterized in that It includes a central control circuit, a first power supply circuit, a second power supply circuit and a voltage stabilizing filter delay circuit. The input ends of the first power supply circuit and the second power supply circuit are respectively connected to an external power supply, and the output end of the first power supply circuit is connected to the input end of the voltage stabilizing filter delay circuit. The first power supply circuit is used to step down the voltage input by the external power supply so that the output voltage of the first power supply circuit is ≤ the voltage threshold. The voltage stabilizing filter delay circuit is used to perform voltage stabilizing filtering on the voltage output by the first power supply circuit and output it after delay. The output end of the voltage stabilizing filter delay circuit serves as the output end of the controllable power supply circuit and is used to supply power to the target. The output end of the second power supply circuit is connected to the central control circuit. The second power supply circuit is used to step down the access voltage and then input a specific voltage to the central control circuit to supply power to the central control circuit.

2. The controllable power supply circuit with protection according to claim 1, It is characterized in that The first power supply circuit includes capacitor C3, capacitor C4, capacitor C5, capacitor C7, capacitor C8, resistor R1, resistor R2, resistor R5, resistor R19, diode D1, light emitting diode D2 and buck chip U1, one end of capacitor C3, one end of resistor R2, input pin VIN and power pin VCC of buck chip U1 are connected together and serve as the input end of the first power supply circuit, the other end of capacitor C3 is grounded, the other end of resistor R2 is respectively connected to VOVP pin of buck chip U1, one end of resistor R5, one end of capacitor C7 and one end of capacitor C8, the other end of resistor R5, capacitor C The other end of capacitor C7 and the other end of capacitor C8 are grounded respectively, the enable pin EN of the buck chip U1 is connected to the central control circuit and one end of resistor R19 respectively, the other end of resistor R19 is grounded, the output pin VOUT of the buck chip U1 is connected to the anode of diode D1, the cathode of diode D1 is connected to one end of capacitor C4, one end of capacitor C5 and one end of resistor R1 in sequence, and the commonly connected connection node serves as the output end of the first power supply circuit, the other end of capacitor C4 and the other end of capacitor C5 are grounded, the other end of resistor R1 is connected to the anode of light-emitting diode D2, and the cathode of light-emitting diode D2 is grounded.

3. The controllable power supply circuit with protection according to claim 2, It is characterized in that The voltage stabilizing filter delay circuit includes capacitor C17, capacitor C18, capacitor C19, capacitor C20, capacitor C21, capacitor C22, capacitor C23, resistor R13, resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, light emitting diode D4, inductor L2 and voltage stabilizing chip U4, one end of capacitor C21, one end of capacitor C22, one end of resistor R13 and input pin VIN of voltage stabilizing chip U4 are connected together and serve as the input end of the voltage stabilizing filter delay circuit, the other end of capacitor C21 and the other end of capacitor C22 are grounded respectively, one end of resistor R13 is connected together with enable pin EN of voltage stabilizing chip U4 and connected in series with capacitor C23 and then grounded, the ground pin GND of voltage stabilizing chip U4 is grounded, pin LX of voltage stabilizing chip U4, one end of capacitor C17 and one end of inductor L2 are connected together, the other end of capacitor C17 is connected to the enable pin EN of voltage stabilizing chip U4 and connected in series with capacitor C23 and then grounded, the ground pin GND of voltage stabilizing chip U4 is grounded, pin LX of voltage stabilizing chip U4, one end of capacitor C17 and one end of inductor L2 are connected together, the other end of capacitor C17 is connected to the enable pin EN of voltage stabilizing chip U4 and connected in series with capacitor C23 and then grounded. Pin BS is connected, the other end of the inductor L2 is connected to one end of the capacitor C18, one end of the capacitor C19, one end of the capacitor C20, one end of the resistor R14, one end of the resistor R15 and one end of the resistor R16 in sequence, and the commonly connected connection node serves as the output end of the voltage stabilizing filter delay circuit, the other end of the capacitor C18 and the other end of the capacitor C19 are grounded respectively, the other end of the capacitor C20 is respectively connected to the pin FB / OUT of the voltage stabilizing chip and the first connection node, the first connection node is the connection node where the other end of the resistor R14 is connected to one end of the resistor R17, the other end of the resistor R17 is grounded, the other end of the resistor R15 is connected to the positive electrode of the light-emitting diode D4, the negative electrode of the light-emitting diode D4 is grounded, the resistor R16 is connected in series with the resistor R18 and then grounded, and the connection node between the resistor R16 and the resistor R18 is defined as a second connection node, and the second connection node is connected to the central control circuit.

4. The controllable power supply circuit with protection according to claim 3, It is characterized in that The second power supply circuit includes a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a resistor R6, a resistor R9, a resistor R10, a resistor R12, an inductor L1 and a power management chip U2. One end of the capacitor C12, one end of the capacitor C13, one end of the resistor R6 and an input pin VIN of the power management chip U2 are connected together and serve as the input end of the second power supply circuit. The other end of the capacitor C12 and the other end of the capacitor C13 are grounded respectively. The other end of the resistor R6 and an enable pin EN of the power management chip U2 are connected and connected in series with a resistor R9 and then grounded. The ground pin GND of the power management chip U2 is connected Grounded, pin FB of the power management chip U2 is connected to the third connection node, the third connection node is the connection node between the resistor R10 and the resistor R12, pin BOOT of the power management chip U2 is connected in series with the capacitor C11 and then connected to the control pin of the power management chip U2, and are commonly connected to one end of the inductor L1, the other end of the inductor L1 is sequentially connected to one end of the capacitor C14, one end of the capacitor C15, and one end of the resistor R10, and the commonly connected connection node serves as the output end of the second power supply circuit, the other end of the capacitor C14 and the other end of the capacitor C15 are grounded respectively, and the other end of the resistor R10 is connected in series with the resistor R12 and then grounded.

5. The controllable power supply circuit with protection according to claim 4, It is characterized in that The central control circuit includes a processor U3, a capacitor C9, a capacitor C10, a capacitor C16, a resistor R7, a resistor R8 and a resistor R11. The pin LDO_CAP of the processor U3 is connected in series with the capacitor C9 and then grounded. The first power pin VDD of the processor U3 is respectively connected to one end of the capacitor C10 and the output end of the second power supply circuit. The data pin 4 of the processor U3 is connected in series with the resistor R7 and then connected to the second connection node of the voltage stabilizing filter delay circuit. The data pin 5 of the processor U3 is connected in series with the resistor R8 and then serves as the access terminal UART1_RXD. The data pin 6 of the processor U3 is connected in series with the resistor R11 and then serves as the sending terminal UART1_TXD. The access terminal UART1_RXD and the sending terminal UART1_TXD are connected to the external instruction operation terminal to receive the sent signal and upload the feedback signal. The second power pin AVDD of the processor U3 is respectively connected to one end of the capacitor C16 and the output end of the second power supply circuit. The other end of the capacitor C16 is grounded. The data pin 15 of the processor U3 is connected to the enable pin EN of the buck chip U1 in the first power supply circuit.

6. The controllable power supply circuit with protection according to claim 5, It is characterized in that It also includes an external power supply circuit, which includes a DC socket J1, a capacitor C1 and a capacitor C2. The DC socket J1 is used to connect to an external power supply. Pin 1 of the DC socket J1 is respectively connected to one end of the capacitor C1 and one end of the capacitor C2 and serves as the output of the external power supply circuit. The output end of the external power supply circuit is respectively connected to the input end of the first power supply circuit and the input end of the second power supply circuit. Pin 2 and pin 3 of the DC socket J1, the other end of the capacitor C1, and the other end of the capacitor C2 are connected and grounded together.

7. The controllable power supply circuit with protection according to claim 5, It is characterized in that It also includes a switching circuit, which includes a resistor R3, a resistor R3, a capacitor C6, a diode D3 and a switch S1. One end of the resistor R4 is connected to the data pin 11 of the processor U3 in the central control circuit, and the other end of the resistor R4 is respectively connected to one end of the capacitor C6, one end of the resistor R3, the cathode of the diode D3, and the contact 1 of the switch button S1. The other end of the capacitor C6 is grounded, the anode of the diode D3 is grounded, the other end of the diode D3 is connected to the output end of the second power supply circuit, and the contact 2 of the switch button S1 is grounded.

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