Start-up holding circuit

Abstract

The utility model relates to the technical field of power supply stabilization, and discloses a startup maintenance circuit, which comprises a power supply input module, a maintenance power supply module and a startup trigger module which are electrically connected in sequence, the power supply input module is used for providing a stable direct current power supply, and the startup trigger module is used for starting the startup trigger module after receiving a startup signal. A control signal is generated to control and start the power supply maintaining module; and the power supply maintaining module is used for still providing a power supply for the load module to work after the starting-up signal disappears. According to the power-on maintaining circuit, the power-on trigger module generates the control signal to control and start the power supply maintaining module after receiving the power-on signal, and the power supply maintaining module can still provide a power supply for the load module to work after the power-on signal disappears, so that the power-on maintaining circuit is provided, stable power supply after equipment is powered on is realized, and the power supply reliability is improved. The operation stability of the equipment is improved; the whole circuit is simple and practical in design, is suitable for the field of various electronic devices, and has wide application prospects.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply stabilization, in particular to a power-on maintenance circuit. Background Art

[0002] In the prior art, in the field of electronic equipment, the power-on maintenance circuit is a key part to ensure the stable operation of the equipment. The traditional power-on maintenance circuit has many design deficiencies, such as unstable startup and unsustainable power supply, which affects the overall performance and stability of the equipment.

[0003] Therefore, how to provide a power-on maintenance circuit to provide a stable power supply to the device has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to provide a power-on maintenance circuit to provide a stable power supply to the equipment.

[0005] To this end, according to the first aspect, an embodiment of the utility model discloses a power-on maintenance circuit, comprising: a power input module, a maintenance power supply module and a power-on trigger module electrically connected in sequence, the power input module being used to provide a stable DC power supply, the power-on trigger module being used to generate a control signal to control the start-up of the maintenance power supply module after receiving a power-on signal; the maintenance power supply module being used to still provide power to the load module for operation after the power-on signal disappears.

[0006] The utility model is further configured as follows: the power input module includes an interface socket J1, a capacitor C1, a resistor R1 and a resistor R2, one end of the capacitor C1 is respectively connected to the VBUS3 pin and the VBUS4 pin of the interface socket J1, and the other end of the capacitor C1 is grounded DGND; one end of the capacitor R1 is connected to the CC1 pin of the interface socket J1, and the other end of the capacitor R1 is grounded DGND; one end of the capacitor R2 is connected to the CC2 pin of the interface socket J1, and the other end of the capacitor R2 is grounded DGND.

[0007] The utility model is further configured that the interface seat J1 is a USB power input terminal, and the interface seat J1 is used to obtain power through a USB interface.

[0008] The utility model is further configured that the maintenance power supply module includes a MOS tube Q1, a transistor Q2, a resistor R4, a resistor R6, a resistor R7, a resistor R3 and a connector PCB1;

[0009] Pin 1 of the MOS tube Q1 is connected to one end of the resistor R4 and pin 3 of the transistor Q2, pin 2 of the MOS tube Q1 is connected to the other end of the resistor R4, pin 3 of the MOS tube Q1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to pin 1 of the connector PCB1, and pin 2 of the connector PCB1 is grounded;

[0010] A pin 1 of the transistor Q2 is connected to one end of the resistor R7 , and the other end of the resistor R7 and a pin 2 of the transistor Q2 are both grounded DGND.

[0011] The utility model is further configured such that the power-on trigger module includes a switch S1, a capacitor C3, a resistor R5 and a resistor R4, wherein pin 1 of the switch S1 is connected to the maintenance power supply module, and pin 2 of the switch S1 is respectively connected to the resistor R5 and one end of the capacitor C3; one end of the resistor R4 is connected to the power input module, the other end of the resistor R4 is connected to the other end of the resistor R5, and the other end of the capacitor C3 is grounded.

[0012] The utility model is further configured that the load module includes a connector PCB2 and a load, one end of the load is connected to pin 1 of the connector PCB2, the other end of the load is grounded, and pin 2 of the PCB2 is grounded.

[0013] The utility model is further configured that the load is an LED, a heating wire, a music box, a buzzer, a screen, Bluetooth or WIFI.

[0014] The utility model has the following beneficial effects: after receiving the power-on signal, the power-on trigger module generates a control signal to control the start-up maintenance power supply module, and after the power-on signal disappears, the maintenance power supply module can still provide power to the load module for operation, thereby providing a power-on maintenance circuit, realizing a stable power supply after the device is turned on, and improving the operating stability of the device; the overall circuit design is simple and practical, suitable for various electronic equipment fields, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a structural block diagram of a power-on maintenance circuit disclosed in this embodiment;

[0017] Figure 2 It is a circuit schematic diagram of a power input module in a power-on maintenance circuit disclosed in this embodiment;

[0018] Figure 3 It is a circuit schematic diagram of a power supply maintenance module and a power-on trigger module in a power-on maintenance circuit disclosed in this embodiment;

[0019] Figure 4 This is a circuit schematic diagram of a load module in a power-on maintenance circuit disclosed in this embodiment. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] The utility model embodiment discloses a power-on maintenance circuit, such as Figure 1-4As shown, it includes: a power input module, a maintenance power supply module and a power-on trigger module which are electrically connected in sequence, the power input module is used to provide a stable DC power supply, the power-on trigger module is used to generate a control signal to control the start-up of the maintenance power supply module after receiving a power-on signal; the maintenance power supply module is used to provide power to the load module for operation after the power-on signal disappears.

[0025] It should be noted that after receiving the power-on signal, the power-on trigger module generates a control signal to start the maintenance power supply module. After the power-on signal disappears, the maintenance power supply module can still provide power to the load module for operation, thereby providing a power-on maintenance circuit, realizing a stable power supply after the equipment is turned on, and improving the operating stability of the equipment; the overall circuit design is simple and practical, suitable for various electronic equipment fields, and has broad application prospects.

[0026] like Figure 1 and Figure 2 As shown, the power input module includes an interface socket J1, a capacitor C1, a resistor R1 and a resistor R2, one end of the capacitor C1 is respectively connected to the VBUS3 pin and the VBUS4 pin of the interface socket J1, and the other end of the capacitor C1 is grounded DGND; one end of the capacitor R1 is connected to the CC1 pin of the interface socket J1, and the other end of the capacitor R1 is grounded DGND; one end of the capacitor R2 is connected to the CC2 pin of the interface socket J1, and the other end of the capacitor R2 is grounded DGND.

[0027] like Figure 1 and Figure 2 As shown, the interface socket J1 is a USB power input terminal, and the interface socket J1 is used to obtain power through the USB interface.

[0028] like Figure 1 and Figure 3 As shown, the maintenance power supply module includes a MOS tube Q1, a transistor Q2, a resistor R4, a resistor R6, a resistor R7, a resistor R3 and a connector PCB1;

[0029] Pin 1 of the MOS tube Q1 is connected to one end of the resistor R4 and pin 3 of the transistor Q2, pin 2 of the MOS tube Q1 is connected to the other end of the resistor R4, pin 3 of the MOS tube Q1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to pin 1 of the connector PCB1, and pin 2 of the connector PCB1 is grounded;

[0030] A pin 1 of the transistor Q2 is connected to one end of the resistor R7 , and the other end of the resistor R7 and a pin 2 of the transistor Q2 are both grounded to DGND.

[0031] like Figure 1 and Figure 3As shown, the power-on trigger module includes a switch S1, a capacitor C3, a resistor R5, and a resistor R4. Pin 1 of the switch S1 is connected to the power supply module, and pin 2 of the switch S1 is connected to the resistor R5 and one end of the capacitor C3 respectively; one end of the resistor R4 is connected to the power input module, and the other end of the resistor R4 is connected to the other end of the resistor R5, and the other end of the capacitor C3 is grounded. In the specific implementation process, one end of the resistor R4 is connected to the VBUS end of the interface socket J1, and pin 1 of the switch S1 is connected to pin 1 of the transistor Q2, the resistor R6, and one end of the resistor R7 respectively.

[0032] like Figure 1 and Figure 4 As shown, the load module includes a connector PCB2 and a load, one end of the load is connected to pin 1 of the connector PCB2, the other end of the load is grounded, and pin 2 of the PCB2 is grounded.

[0033] like Figure 1 and Figure 4 As shown, the load is LED, heating wire, music box, buzzer, screen, Bluetooth or WIFI.

[0034] In the specific implementation process, the boot process:

[0035] (a) When the power input module is connected to the circuit, the voltage is simultaneously sent to the source and gate of the MOS tube Q1, that is, the left and lower electrodes of the MOS tube Q1 in the figure. At this time, because the working conditions of the tube are not met, the tube is currently in a cut-off state, and there is no voltage at the connector PCB1 point.

[0036] (b) At this time, the power-on trigger module is already changing quietly. The current will pass through resistors R4 and R5, and then charge capacitor C3. However, this time can be adjusted by adjusting the capacity of resistor R5 / capacitor C3. When capacitor C3 has been fully charged, there is a high level at both ends of capacitor C3. When the switch S1 button is pressed, capacitor C3 will use the BE junction discharge loop of transistor Q2, and the voltage will make transistor Q2 turn on instantly. Then, the gate of MOS tube Q1 will be quickly pulled to about 0V, that is, a low level, by transistor Q2, and then because MOS tube Q1 has reached the conduction condition, there will be an output at connector PCB1.

[0037] (c) After the switch S1 is released, it will continue to remain in the on state. When there is voltage at the connector PCB1 point, this voltage will continue to drive the transistor Q2 to turn on after being divided by the resistor R6 / resistor R7. Then, when the transistor Q2 is turned on, it can continue to drive the MOS tube Q1 to turn on, and then maintain the state of the circuit.

[0038] Shutdown process: When you need to shut down, press switch S1, and the low-level voltage on capacitor C3 pulls down the base voltage of transistor Q2, turning off transistor Q2. In this way, the G pole of MOS tube Q1 returns to a high level, and the voltage between MOS tube GS can no longer maintain the conduction of MOS tube Q1, so MOS tube Q1 is also turned off, cutting off the power supply path, and the circuit is shut down.

[0039] Working principle: After receiving the power-on signal, the power-on trigger module generates a control signal to start the maintenance power supply module. After the power-on signal disappears, the maintenance power supply module can still provide power to the load module for operation, thereby providing a power-on maintenance circuit, realizing a stable power supply after the equipment is turned on, and improving the operating stability of the equipment; the overall circuit design is simple and practical, suitable for various electronic equipment fields, and has broad application prospects.

[0040] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A power-on maintenance circuit, characterized in that: include: A power input module, a maintenance power supply module and a power-on trigger module electrically connected in sequence, wherein the power input module is used to provide a stable DC power supply, and the power-on trigger module is used to generate a control signal to control the start-up of the maintenance power supply module after receiving a power-on signal; and the maintenance power supply module is used to provide power to the load module for operation after the power-on signal disappears; The power-on trigger module includes a switch S1, a capacitor C3, a resistor R5 and a resistor R4, wherein pin 1 of the switch S1 is connected to the maintenance power supply module, and pin 2 of the switch S1 is respectively connected to the resistor R5 and one end of the capacitor C3; one end of the resistor R4 is connected to the power input module, the other end of the resistor R4 is connected to the other end of the resistor R5, and the other end of the capacitor C3 is grounded.

2. The power-on maintenance circuit according to claim 1, characterized in that: The power input module includes an interface socket J1, a capacitor C1, a resistor R1 and a resistor R2, one end of the capacitor C1 is respectively connected to the VBUS3 pin and the VBUS4 pin of the interface socket J1, and the other end of the capacitor C1 is grounded DGND; one end of the capacitor R1 is connected to the CC1 pin of the interface socket J1, and the other end of the capacitor R1 is grounded DGND; one end of the capacitor R2 is connected to the CC2 pin of the interface socket J1, and the other end of the capacitor R2 is grounded DGND.

3. The power-on maintenance circuit according to claim 2, characterized in that: The interface socket J1 is a USB power input terminal, and the interface socket J1 is used to obtain power through a USB interface.

4. The power-on maintenance circuit according to claim 1, characterized in that: The maintenance power supply module includes a MOS tube Q1, a transistor Q2, a resistor R4, a resistor R6, a resistor R7, a resistor R3 and a connector PCB1; Pin 1 of the MOS tube Q1 is connected to one end of the resistor R4 and pin 3 of the transistor Q2, pin 2 of the MOS tube Q1 is connected to the other end of the resistor R4, pin 3 of the MOS tube Q1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to pin 1 of the connector PCB1, and pin 2 of the connector PCB1 is grounded; A pin 1 of the transistor Q2 is connected to one end of the resistor R7 , and the other end of the resistor R7 and a pin 2 of the transistor Q2 are both grounded DGND.

5. The power-on maintenance circuit according to claim 1, characterized in that: The load module includes a connector PCB2 and a load, one end of the load is connected to pin 1 of the connector PCB2, the other end of the load is grounded, and pin 2 of the PCB2 is grounded.

6. The power-on maintenance circuit according to claim 5, characterized in that: The load is an LED, a heating wire, a music box, a buzzer, a screen, Bluetooth or WIFI.

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