CN218678824U - Load activation circuit and power supply device - Google Patents

Abstract

The application provides a load activation circuit and power supply equipment, relates to power technical field. The load activation circuit is added with the activation circuit, the activation circuit can comprise a switch circuit, a voltage division circuit and a load enabling circuit, the switch circuit is conducted when a load is connected, so that the voltage division circuit divides voltage and activates the load enabling circuit, the load enabling circuit starts a control unit, the control unit can control the conduction of a main loop, the battery voltage of equipment flows through the main loop to supply power for the load, and the equipment after the load is connected is automatically started to supply power for the load; when the load is not connected, the switch circuit is not conducted, the load enabling circuit is not activated, the control unit does not work, the main loop is disconnected, and the equipment is in a shutdown state, so that the power consumption of the equipment when the load is not connected is avoided.

Description

Load activation circuit and power supply device

Technical Field

The utility model relates to a power technology field particularly, relates to a load activation circuit and power supply unit.

Background

At present, a traditional load activation circuit mainly comprises a switch control circuit and a main loop, and after a load is added into the circuit, an equipment switch needs to be manually turned on to activate the switch control circuit, so that the main loop is controlled by the switch control circuit to supply power to the load.

However, the above method needs to supply power to the load only when the device is first powered on, and the load can be normally used, so that the power consumption of the device for supplying power to the load is large, and the use of the load is limited.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a load activation circuit and power supply unit to not enough among the above-mentioned prior art to the load that exists among the solution prior art uses limitedly, the great problem of power supply unit power consumption.

In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:

in a first aspect, an embodiment of the present application provides a load activation circuit, including: the circuit comprises an activation circuit, a control unit and a main loop;

the control unit is respectively connected with the activation circuit and the main loop, and the main loop is also used for connecting a load;

the activation circuit is used for supplying power to the control unit after the main loop is connected to a load, so that the control unit controls the main loop to be conducted and supplies power to the load.

Optionally, a first end of the control unit is connected to a first end of the main loop, a second end of the control unit is connected to a second end of the activation circuit, the first end of the activation circuit is connected to a power supply, and the second end of the main loop is used for connecting to a load.

Optionally, the activation circuit comprises: a load enable circuit;

the load enable circuit is connected with the control unit, and the load enable circuit supplies power to the control unit in an enable state.

Optionally, the activation circuit comprises: the circuit comprises a switch circuit, a voltage division circuit and a load enabling circuit;

the first end of the switch circuit is connected with a power supply, and the second end of the switch circuit is connected with the voltage division circuit;

the first end of the load enabling circuit is connected with the voltage dividing circuit, the second end of the load enabling circuit is connected with the control unit, the load enabling circuit is used for supplying power to the control unit when a load is connected, and the control unit is used for controlling the conduction of the main loop and supplying power to the load.

Optionally, the switching circuit comprises an insulated gate field effect transistor, a first resistor; the voltage dividing circuit includes: a second resistor and a third resistor; the load enable circuit includes: an OR gate circuit, comprising a load power supply input and an output;

the source electrode of the insulated gate field effect transistor is connected with the power supply, the grid electrode of the insulated gate field effect transistor is connected with the second end of the first resistor, and the drain electrode of the insulated gate field effect transistor is connected with the first end of the second resistor;

the first end of the first resistor is connected with the power supply;

the second end of the second resistor is connected with the first end of the third resistor;

the second end of the third resistor is grounded;

and the load power supply input end of the OR gate circuit is connected to the second end of the second resistor, and the output end of the OR gate circuit is connected with the control unit.

Optionally, the switching circuit further comprises: a diode;

and the anode of the diode is connected with the second end of the first resistor, and the cathode of the diode is used for connecting the anode of a load.

Optionally, the switching circuit further comprises: a first voltage regulator tube; the first voltage-regulator tube is connected with the first resistor in parallel.

Optionally, the or gate circuit further includes: the input end of the switch power supply is used for being connected with the control switch or being connected with an external power supply.

Optionally, the load enable circuit further comprises: a voltage conversion unit;

the first end of the voltage conversion unit is connected with the output end of the OR gate circuit;

and the second end of the voltage conversion unit is connected with the control unit.

Optionally, the voltage divider circuit further comprises: a second voltage regulator tube;

and the first end of the second voltage-regulator tube is connected with the second end of the second resistor, and the second end of the second voltage-regulator tube is grounded.

Optionally, the load activation circuit further comprises: a load;

and the third end of the main loop is connected with the power supply, the second end of the main loop is connected with the anode of the load, and the cathode of the load is grounded.

Optionally, the anode of the load is further connected to the cathode of the diode.

In a second aspect, an embodiment of the present application further provides a power supply device, including the load activation circuit described in the first aspect.

The beneficial effect of this application is:

the application provides a load activation circuit and power supply equipment, this load activation circuit includes: the circuit comprises an activation circuit, a control unit and a main loop; the control unit is respectively connected with the activation circuit and the main loop, and the main loop is also used for connecting a load; the activation circuit is used for supplying power to the control unit after the main loop is connected with the load, so that the control unit controls the main loop to be conducted and supplies power to the load. The load activation circuit is added with the activation circuit, so that after the load is connected into the main loop, the activation circuit can be triggered to supply power to the control unit, and the control unit can control the conduction of the main loop, so that the battery voltage of the equipment flows through the main loop to supply power to the load, and the equipment after the load is connected is automatically started to supply power to the load; when the load is not connected, the activation circuit is not activated, the control unit is not powered, the control unit does not work, the main loop is disconnected, and the equipment is in a shutdown state, so that the power consumption of the equipment when the load is not connected is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic diagram of a first load activation circuit according to an embodiment of the present application;

fig. 2 is a schematic diagram of a second load activation circuit according to an embodiment of the present application;

fig. 3 is a schematic diagram of a power supply apparatus according to an embodiment of the present application.

Icon: load activation circuit-100A; activation circuit-100; a control unit-200; main loop-300; power-VBAT; a switching circuit-10; a voltage divider circuit-20; a load enable circuit-30; an insulated gate field effect transistor-Q2; a first resistance-R1; a second resistance-R2; a third resistor-R3; load Power input terminal-Load Power; an output terminal-EN; a diode-D1; a first voltage regulator tube-Z1; the input end of the switching Power supply is MCU Power; a controller-MCU; load-Load; load positive-DC +; load negative-DC-.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 is a schematic diagram of a first load activation circuit according to an embodiment of the present application; as shown in fig. 1, the load activation circuit 100A may include: the circuit comprises an activation circuit 100, a control unit 200 and a main loop 300, wherein the control unit 200 is respectively connected with the activation circuit 100 and the main loop 300, and the main loop 300 can also be used for connecting a load.

The traditional load power supply mode can have two types: firstly, the load is supplied with power through the power supply equipment, and in the power supply mode, the power supply equipment needs to be manually controlled to be started, and the load can be supplied with power in the starting state of the power supply equipment. For example: the mobile phone is charged through the computer, the computer needs to be started first, and the mobile phone can be charged in the starting state.

And the second method comprises the following steps: the load is directly connected to a power supply, and the load is directly powered by the power supply, for example: the handset is plugged into the power supply through the charger.

The first method results in large power consumption of the power supply device, and cannot realize low-power-consumption power supply, while the second method is limited in power supply of the load, and cannot realize mobile power supply.

Optionally, the load activation circuit provided in this embodiment includes the activation circuit 100, the activation circuit 100 may be used to supply power to the control unit 200, and when the control unit 200 is powered, the main loop 300 may be controlled to be turned on, so that the battery voltage of the device may supply power to the load through the main loop 300.

In summary, the load activation circuit provided in this embodiment includes: the circuit comprises an activation circuit, a control unit and a main loop; the control unit is respectively connected with the activation circuit and the main loop, and the main loop is also used for connecting a load; the activation circuit is used for supplying power to the control unit after the main loop is connected with the load, so that the control unit controls the main loop to be conducted and supplies power to the load. The load activation circuit is added with the activation circuit, so that after the load is connected into the main loop, the activation circuit can be triggered to supply power to the control unit, and the control unit can control the conduction of the main loop, so that the battery voltage of the equipment flows through the main loop to supply power to the load, and the equipment after the load is connected is automatically started to supply power to the load; when the load is not connected, the activation circuit is not activated, the control unit is not powered, the control unit does not work, the main loop is disconnected, and the equipment is in a shutdown state, so that the power consumption of the equipment when the load is not connected is avoided.

Continuing with fig. 1, in an alternative embodiment, a first terminal of the control unit 200 is connected to a first terminal of the main loop 300, a second terminal of the control unit 200 is connected to a second terminal of the activation circuit 100, the first terminal of the activation circuit 100 is connected to the power source VBAT, and the second terminal of the main loop 300 is used for connecting to a load.

Optionally, the activation circuit 100 may include a load enable circuit, the load enable circuit is connected to the control unit 200, and when the load is connected to the main circuit 300, the load enable circuit may be enabled to activate to supply power to the control unit 200, and the control unit 200 controls the main circuit 300 to be turned on to supply power to the load.

Continuing with FIG. 1, in one implementable manner, the activation circuit 100 can comprise: a switching circuit 10, a voltage divider circuit 20, and a load enable circuit 30.

A first terminal of the switch circuit 10 is connected to the power source VBAT, and a second terminal of the switch circuit 10 is connected to the voltage dividing circuit 20.

The power source may refer to a battery voltage, i.e. a battery voltage of a power supply device comprising the load activation circuit. The switching circuit 10 has a switching function and is switchable between on and off.

A first end of the load enable circuit 30 is connected to the voltage dividing circuit 20, a second end of the load enable circuit 30 is connected to the control unit 200, the load enable circuit 30 is configured to supply power to the control unit 200 when a load is connected, and the control unit 200 is configured to control the main loop 300 to be turned on and supply power to the load.

The load enable circuit 30 may function as a driving control unit 200, and the control unit 200 may be driven to start or stop by level shifting at an input terminal of the load enable circuit 30.

When the load is not connected to the primary circuit 300, the load enable circuit 30 may output a low level, at this time, power is not supplied to the control unit 200, the control unit 200 does not operate, the primary circuit 300 is cut off, and when the load is connected to the primary circuit 300, the load enable circuit 30 may output a high level, power is supplied to the control unit 200, the control unit 200 operates, and the battery power is switched back to the primary circuit 300, so that the battery power may supply power to the load connected to the end of the primary circuit 300 through the primary circuit 300.

The load activation circuit is added with the activation circuit, the activation circuit can comprise a switch circuit, a voltage division circuit and a load enabling circuit, the switch circuit is conducted when a load is connected, so that the voltage division circuit divides voltage and activates the load enabling circuit, the load enabling circuit starts a control unit, the control unit can control the conduction of a main loop, the battery voltage of equipment flows through the main loop to supply power for the load, and the equipment after the load is connected is automatically started to supply power for the load; when the load is not connected, the switch circuit is not conducted, the load enabling circuit is not activated, the control unit does not work, the main loop is disconnected, and the equipment is in a shutdown state, so that the power consumption of the equipment when the load is not connected is avoided.

Of course, the specific structure of the activation circuit given above is only one possible structure that can implement the working principle of the circuit, and in practical application, the activation circuit may have other structures as well, and the working principle of the circuit can be implemented.

Fig. 2 is a schematic diagram of a second load activation circuit according to an embodiment of the present application; as shown in fig. 2, the switching circuit 10 includes an insulated gate field effect transistor Q2, a first resistor R1; the voltage dividing circuit 20 includes: a second resistor R2 and a third resistor R3; the load enable circuit 30 includes: the OR gate circuit comprises a Load Power input end Load Power and an output end EN.

The source electrode of the insulated gate field effect transistor Q2 is connected with a power supply, the grid electrode of the insulated gate field effect transistor Q2 is connected with the second end of the first resistor R1, and the drain electrode of the insulated gate field effect transistor Q2 is connected with the first end of the second resistor R2.

The insulated gate field effect transistor Q2 in the scheme can be a Pmos insulated gate field effect transistor, and for the Pmos insulated gate field effect transistor, when the voltage difference Vgs between the grid g and the source s is smaller than Vgs (th), the insulated gate field effect transistor is turned on, otherwise, the insulated gate field effect transistor is turned on. Where Vgs (th) may refer to the tube turn-on voltage of Pmos igbt, it is noted that Vgs (th) of Pmos igbt is a negative number.

Of course, for different types of insulated gate fets, the conduction conditions may differ.

The first end of the first resistor R1 is connected with a power supply; the second end of the second resistor R2 is connected with the first end of the third resistor R3; the second end of the third resistor R3 is grounded.

When the load is not applied, the two ends of the first resistor R1 are at the same potential, and the source and the gate of the insulated gate field-effect transistor Q2 are also at the same potential, so that the difference Vgs between the voltages of the gate and the source is 0, and 0 is greater than all negative numbers, that is, vgs does not satisfy the condition of being less than Vgs (th), and at this time, the insulated gate field-effect transistor Q2 is not turned on.

After the load is connected, the first resistor R1 and the load both play a role in voltage division, the voltage of the battery flows from the first end of the first resistor R1 to the second end, and the voltage of the second end of the first resistor R1 is smaller than that of the first end, so that the voltage of the grid electrode of the insulated gate field effect transistor Q2 is smaller than that of the source electrode, at the moment, the difference Vgs between the voltages of the grid electrode and the source electrode is negative, and the resistance value of the first resistor R1 can be set according to requirements.

The Load Power input terminal Load Power of the or gate is connected to the second terminal of the second resistor R2, and the output terminal EN of the or gate is connected to the control unit 200.

Optionally, when the Load is not connected, since the insulated gate fet Q2 is not turned on, the Load Power input terminal Load Power is pulled to ground by the third resistor R3, and the level of the Load Power input terminal Load Power is pulled low to a low level, at this time, when the or gate circuit has only one input terminal, that is, the Load Power input terminal Load Power, then the output terminal EN outputs a low level, then the Load enable circuit 30 does not supply Power to the control unit 200, the control unit 200 does not operate, and the main circuit 300 does not supply Power to the Load.

After the Load is connected, because the insulated gate field effect transistor Q2 is turned on, the second resistor R2 and the third resistor R3 divide the voltage, the level of the Load Power at the input end of the Load Power supply is pulled high to a high level, at this time, the Load enable circuit 30 is enabled, the output end EN outputs the high level, the Load enable circuit 30 supplies Power to the control unit 200, the control unit 200 operates, and the main control loop 300 supplies Power to the Load.

It should be noted that the resistances of the first resistor R1, the second resistor R2, and the third resistor R3 can be flexibly set according to the circuit design requirement.

As further shown in fig. 2, the switching circuit 10 further includes: a diode D1; the anode of the diode D1 is connected to the second end of the first resistor R1, and the cathode of the diode D1 is used to connect the anode of the load.

The diode D1 is used for preventing current from flowing backwards, and ensuring that the current flows to a load through the first resistor R1 after flowing out of a power supply so as to ensure that the voltage difference between the grid electrode and the source electrode of the insulated gate field effect transistor Q2 meets the condition, and the insulated gate field effect transistor Q2 can be conducted to work when the load is connected.

If there is no diode D1, when the load is connected to a device such as a charger, current will flow back from the load to the power supply in the reverse direction, the gate voltage of the insulated gate fet Q2 is greater than the source voltage, the insulated gate fet Q2 is not turned on, and the load enable circuit 30 cannot be driven to control the main circuit 300 to supply power to the load through the control unit 200.

As further shown in fig. 2, the switching circuit 10 further includes: a first voltage regulator tube Z1; the first voltage regulator tube Z1 is connected with the first resistor R1 in parallel.

Optionally, the first voltage regulator tube Z1 is used for protecting the insulated gate field effect tube Q2, so as to stabilize the battery voltage within a preset voltage range and prevent a pulse from impacting the circuit.

Continuing with FIG. 2, the OR gate further comprises: the input end of the switching Power supply MCU Power is used for being connected with the control switch or an external Power supply.

In an implementation manner, the or gate circuit may further include a switching Power supply input MCU Power, which may be controlled by a switch or a button, or may be connected to an external Power supply. When the load is accessed and Power is required to be supplied to the load, a user can manually open the switch, so that the Power of the switching Power supply input end MCU is pulled high to be a high level, or after the Power of the switching Power supply input end MCU is accessed into an external Power supply, the Power of the switching Power supply input end MCU is pulled high to be the high level. When the MCU Power at the input end of the switching Power supply is at a high level, the output end EN of the load enable circuit 30 is enabled, and the control unit 200 operates to control the main circuit 300 to supply Power to the load.

The method can reserve the traditional mode of starting up the Power supply equipment to supply Power to the load or directly connect the load into the Power supply by setting the MCU Power at the input end of the switching Power supply for the OR gate circuit; the core of the scheme can be realized by setting the Load Power input end, namely, the Load is connected into a mode of automatically starting the Power supply equipment to supply Power for the Load.

No matter the input terminal Load Power or the input terminal MCU Power, if only one input terminal is at high level, the output terminal EN of the or gate circuit will output high level to supply Power to the control unit 200.

As further shown in fig. 2, the load enable circuit 30 further includes: a voltage conversion unit DCDC; the first end of the voltage conversion unit DCDC is connected with the output end of the OR gate circuit; a second terminal of the voltage conversion unit DCDC is connected to the control unit 200.

Alternatively, the voltage conversion unit DCDC refers to a direct current-direct current conversion circuit, and the voltage conversion unit DCDC may convert the battery voltage into a voltage usable by the control unit 200.

In addition, the control unit 200 in this embodiment may be, for example: a controller MCU (Micro controller Unit).

As shown in fig. 2, the voltage divider circuit 20 may further include: a second voltage regulator tube Z2; the first end of the second voltage-regulator tube Z2 is connected with the second end of the second resistor R2, and the second end of the second voltage-regulator tube Z2 is grounded.

Similar to the first regulator tube Z1, the second regulator tube Z2 is used to protect the load enable circuit 30, so as to stabilize the voltage in the circuit within a preset voltage range, and prevent the impact of pulses on the circuit.

As shown in fig. 2, the load activation circuit may further include: loading Load; the third end of the Main Loop 300 (Main Loop) is connected with a power supply VBAT, the second end of the Main Loop 300 is connected with the anode (DC +) of a Load, and the cathode (DC-) of the Load is grounded; the anode of the Load is also connected to the cathode of the diode D1.

It should be noted that the power source VBAT connected to the second end of the main loop 300 is the same power source as the power source 400 connected to the first end of the switch circuit 10, i.e. the power source 400 can be switched between the activation circuit 100 and the main loop 300. After the activation circuit 100 activates the control unit 200, the control unit 200 turns on the main circuit 300, and the power supply 400 is switched from the activation circuit 100 to the main circuit 300 to supply power to the Load.

Next, the operation principle of the load activation circuit of this embodiment will be explained as a whole:

when the Load is not connected, the circuit on the right side of the diode D1 is disconnected, the voltages at the two ends of the first resistor R1 are equal, the voltages at the source and the gate of the insulated gate field effect transistor Q2 are also equal, then Vgs =0, and Vgs (TH) is a negative number, 0 is greater than all negative numbers, that is, vgs > Vgs (TH), the insulated gate field effect transistor Q2 is not conducted, the Load Power input end Load Power is pulled to the ground by the resistor R3, that is, pulled down to a low level, at this time, if the switch Power input end MCU Power is not started, the switch Power input end MCU Power is also at a low level, then the output end EN is not enabled, the voltage conversion unit DCDC does not work, the control unit MCU does not work, so that the Main Loop 300 (Main Loop) maintains a cut-off state, the Load activation circuit is in a non-working state, that is, the Power supply equipment for supplying Power to the Load is in a shutdown state.

After the Load is connected, the first resistor R1, the diode D1 and the Load divide voltage, the source voltage of the insulated gate field effect transistor Q2 is larger than the grid voltage, vgs is smaller than Vgs (TH), the insulated gate field effect transistor Q2 is conducted, at the moment, the second resistor R2 and the third resistor R3 divide voltage, the voltage of the Load Power input end Load Power is pulled high by the second resistor R2, the Load Power input end Load Power is at a high level, the output end EN enables activation, the switching Power input end MCU Power outputs the high level to enable the voltage conversion unit DCDC to maintain the working state, and then the Control unit MCU controls CHG/DSG _ Control to open the switching Main Loop (Main _ Loop) to supply Power to the Load.

It is noted that in the load activation circuit shown in fig. 2, some circuits are connected by dashed lines, and the dashed lines mean that some circuit elements are omitted here, for example: the control unit MCU and the Main Loop are connected by a dotted line only for indicating that the control unit MCU can control the Main Loop, but the control unit MCU and the Main Loop are not directly connected and can be connected by other elements, only the concerned part is displayed here, and the display of the core invention point of the scheme is not influenced.

In summary, the load activation circuit provided in this embodiment includes: the circuit comprises an activation circuit, a control unit and a main loop; the control unit is respectively connected with the activation circuit and the main loop, and the main loop is also used for connecting a load; the activation circuit is used for supplying power to the control unit after the main loop is connected with the load, so that the control unit controls the main loop to be conducted and supplies power to the load. The load activation circuit is added with the activation circuit, so that after the load is connected into the main loop, the activation circuit can be triggered to supply power to the control unit, and the control unit can control the conduction of the main loop, so that the battery voltage of the equipment flows through the main loop to supply power to the load, and the equipment after the load is connected is automatically started to supply power to the load; when the load is not accessed, the activation circuit is not activated, the control unit is not powered, the control unit does not work, the main loop is disconnected, and the equipment is in a shutdown state, so that the power consumption of the equipment when the load is not accessed is avoided.

Fig. 3 is a schematic diagram of a power supply apparatus according to an embodiment of the present disclosure, and as shown in fig. 3, the power supply apparatus may include the load activation circuit 100A in the above embodiment.

Optionally, power supply unit can be portable power source equipment, and similar treasured that charges also can be outdoor power supply unit, and traditional treasured that charges is in standby state when the load does not insert the charging, and power continuously consumes, continuously consumes power.

By the load activation mode of the method, the power supply equipment can be kept in the shutdown state when the load is not accessed, power consumption is avoided, and when the load is accessed, the power supply equipment can be triggered to be automatically started to supply power to the load.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A load activation circuit, comprising: the circuit comprises an activation circuit, a control unit and a main loop;

the control unit is respectively connected with the activation circuit and the main loop, and the main loop is also used for connecting a load;

the activation circuit is used for supplying power to the control unit after the main loop is connected to a load, so that the control unit controls the main loop to be conducted and supplies power to the load.

2. The load activation circuit of claim 1, wherein a first terminal of the control unit is coupled to a first terminal of the main loop, a second terminal of the control unit is coupled to a second terminal of the activation circuit, the first terminal of the activation circuit is coupled to a power source, and the second terminal of the main loop is configured to couple to a load.

3. The load activation circuit of claim 1, wherein the activation circuit comprises: a load enable circuit;

the load enable circuit is connected with the control unit, and the load enable circuit supplies power to the control unit in an enable state.

4. The load activation circuit of claim 1, wherein the activation circuit comprises: the circuit comprises a switch circuit, a voltage division circuit and a load enabling circuit;

the first end of the switch circuit is connected with a power supply, and the second end of the switch circuit is connected with the voltage division circuit;

the first end of the load enabling circuit is connected with the voltage dividing circuit, and the second end of the load enabling circuit is connected with the control unit.

5. The load activation circuit of claim 4, wherein the switching circuit comprises an insulated gate field effect transistor, a first resistor; the voltage dividing circuit includes: a second resistor and a third resistor; the load enable circuit includes: the OR gate circuit comprises a load power supply input end and an output end;

the source electrode of the insulated gate field effect transistor is connected with the power supply, the grid electrode of the insulated gate field effect transistor is connected with the second end of the first resistor, and the drain electrode of the insulated gate field effect transistor is connected with the first end of the second resistor;

the first end of the first resistor is connected with the power supply;

the second end of the second resistor is connected with the first end of the third resistor;

the second end of the third resistor is grounded;

and the load power supply input end of the OR gate circuit is connected to the second end of the second resistor, and the output end of the OR gate circuit is connected with the control unit.

6. The load activation circuit of claim 5, wherein the switching circuit further comprises: a diode;

and the anode of the diode is connected with the second end of the first resistor, and the cathode of the diode is used for connecting the anode of a load.

7. The load activation circuit of claim 5, wherein the switching circuit further comprises: a first voltage regulator tube; the first voltage-regulator tube is connected with the first resistor in parallel.

8. The load activation circuit of claim 5, wherein the OR gate further comprises: the input end of the switch power supply is used for being connected with the control switch or being connected with an external power supply.

9. The load activation circuit of claim 5, wherein the load enable circuit further comprises: a voltage conversion unit;

the first end of the voltage conversion unit is connected with the output end of the OR gate circuit;

and the second end of the voltage conversion unit is connected with the control unit.

10. The load activation circuit of claim 5, wherein the voltage divider circuit further comprises: a second voltage regulator tube;

and the first end of the second voltage-regulator tube is connected with the second end of the second resistor, and the second end of the second voltage-regulator tube is grounded.

11. The load activation circuit of claim 6, further comprising: a load;

and the third end of the main loop is connected with the power supply, the second end of the main loop is connected with the anode of the load, and the cathode of the load is grounded.

12. The load activation circuit of claim 11, wherein the positive pole of the load is further connected to the negative pole of the diode.

13. A power supply device comprising a load activation circuit as claimed in any one of claims 1 to 12.

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