CN116915053B

CN116915053B - Load switching circuit, electric energy adjusting method and electric energy adjusting device

Info

Publication number: CN116915053B
Application number: CN202311170741.XA
Authority: CN
Inventors: 杨晓文; 张路; 薛少雄; 司磊磊; 石明磊; 王士晨; 霍冉; 刘小刚
Original assignee: Xi'an Megmeet Electrical Co ltd; Shenzhen Megmeet Electrical Co Ltd
Current assignee: Xi'an Megmeet Electrical Co ltd; Shenzhen Megmeet Electrical Co Ltd
Priority date: 2023-09-12
Filing date: 2023-09-12
Publication date: 2024-02-02
Anticipated expiration: 2043-09-12
Also published as: CN116915053A

Abstract

The application discloses a load switch circuit, electric energy regulation method and electric energy regulation equipment, this load switch circuit includes: the power supply input end is used for being coupled with an external first voltage source; the power supply output end is used for being coupled with an external load circuit; the output switch circuit is coupled between the power input end and the power output end; the adjusting circuit is coupled with the output switch circuit and the power supply output end to sample and obtain a voltage output signal on the power supply output end, and adjusts and sends a control signal to the output switch circuit in response to the frequency change of the voltage output signal, so that the output switch circuit adjusts the voltage output signal in response to the control signal, and the voltage output signal does not exceed a first set threshold value. By means of the method, the load switch circuit can limit the voltage output signal to the first set threshold value, so that damage to the load switch circuit caused by overvoltage and/or overcurrent which possibly occurs is avoided, and adverse effects on the load circuit are effectively avoided.

Description

Load switching circuit, electric energy adjusting method and electric energy adjusting device

Technical Field

The application relates to the technical field of power supplies, in particular to a load switch circuit, an electric energy adjusting method and electric energy adjusting equipment.

Background

In the application process of the power supply equipment, the power supply equipment is inevitably influenced by various reasons such as abnormal power supply voltage, complex electromagnetic environment, illegal operation of constructors, thunder and lightning weather and the like, and the conditions such as overvoltage, overcurrent or interference of signals occur at a power supply port, so that the power supply equipment is damaged, and the power supply to a load circuit is adversely affected, so that the operation reliability of the power supply equipment is reduced.

Disclosure of Invention

The technical problem that this application mainly solves is to provide a load switch circuit, electric energy regulation method and electric energy regulation equipment, can solve the power equipment among the prior art and inevitably can receive the influence of conditions such as excessive pressure, overcurrent, or signal receive interference, and lead to power equipment to damage to cause adverse effect to the power supply of load circuit, so that the lower problem of power equipment operational reliability.

In order to solve the technical problems, one technical scheme adopted by the application is as follows: there is provided a load switching circuit, wherein the load switching circuit includes: the power supply input end is used for being coupled with an external first voltage source; the power supply output end is used for being coupled with an external load circuit; the output switch circuit is coupled between the power input end and the power output end; the adjusting circuit is coupled with the output switch circuit and the power supply output end to sample and obtain a voltage output signal on the power supply output end, and adjusts and sends a control signal to the output switch circuit in response to the frequency change of the voltage output signal, so that the output switch circuit adjusts the voltage output signal in response to the control signal, and the voltage output signal does not exceed a first set threshold value.

The control signal corresponds to a pulse width modulation signal in a set starting time of a voltage output signal output by a power output end to a load circuit, the regulating circuit responds to the frequency variation amplitude of the voltage output signal in the set starting time at each set time interval to increase the duty ratio of the pulse width modulation signal, and the increasing amplitude of the increasing duty ratio is regulated according to a set function until the duty ratio is regulated to 100%.

The output switch circuit comprises a switch sub-circuit and an energy absorbing sub-circuit, wherein the switch sub-circuit is coupled with the power input end, the power output end and the energy absorbing sub-circuit, and receives a first voltage source transmitted by the power input end, a control signal transmitted by the adjusting circuit and a first feedback signal transmitted by the power output end, so that the first voltage source exceeding a second set threshold and/or part of the first feedback signal are transmitted to the energy absorbing sub-circuit, the first voltage source is adjusted in response to the control signal, and the adjusted first voltage source is provided for the power output end.

The output switch circuit further comprises a protection sub-circuit, and the protection sub-circuit is coupled between the switch sub-circuit and the regulating circuit to receive a part of the control signal sent by the switch sub-circuit exceeding a third set threshold.

The energy absorption sub-circuit comprises a first transient diode, a second transient diode, a third transient diode, a first resistor, a first capacitor and a second capacitor, and the protection sub-circuit comprises a second resistor, a protection diode and a third capacitor; the first end of the first switch tube is coupled with the first end of the second switch tube, the first end of the third switch tube, the first end of the first transient diode, the first end of the second transient diode, the first end of the first capacitor, the first end of the second resistor, the first end of the protection diode, the first end of the third capacitor and the power input end; the second end of the first switching tube is coupled with the second end of the second switching tube, the second end of the third switching tube, the second end of the first transient diode, the first end of the third transient diode and the power supply output end; the third end of the first switching tube is coupled with the third end of the second switching tube, the third end of the third switching tube, the second end of the second resistor, the second end of the protection diode, the second end of the third capacitor and the regulating circuit; the second end of the second transient diode is coupled to the first end of the first resistor, the second end of the first resistor is coupled to the second end of the second capacitor and the second end of the third transient diode, and the second end of the first capacitor is coupled to the first end of the second capacitor.

The power input end comprises a first power input end and a second power input end, the first power input end and the second power input end are respectively used for being coupled with a first end and a second end of a first voltage source, the power output end comprises a first power output end and a second power output end, the first power output end and the second power output end are respectively used for being coupled with a first end and a second end of a load circuit, and the output switch circuit is coupled between the second power input end and the second power output end; the load switch circuit further comprises a port decoupling circuit coupled between the output switch circuit and the second power output end to receive a second feedback signal sent by the second power output end and limit the second feedback signal within a fourth set threshold.

The load switch circuit further comprises a follow current circuit, and the follow current circuit is coupled between the first power supply output end and the port decoupling circuit; the follow current circuit receives a negative feedback signal in a matched manner with the port decoupling circuit when the load circuit inputs the negative feedback signal to the output end of the first power supply; or when the port decoupling circuit discharges energy, receiving the energy storage discharging current of the port decoupling circuit.

The first end of each freewheel diode is coupled between the output switch circuit and the port decoupling circuit, and the second end of each freewheel diode is coupled with the first power supply output end.

The load switch circuit further comprises a lightning protection circuit, wherein the lightning protection circuit is coupled between the first power output end and the second power output end, so as to receive a third feedback signal sent by the first power output end and/or the second power output end, and limit the third feedback signal within a fourth set threshold.

The regulating circuit comprises a current sampling sub-circuit and a control sub-circuit, wherein the current sampling sub-circuit is coupled between the power input end and the output switch circuit and is coupled with the control sub-circuit so as to sample a current input signal on the power input end, the current input signal is regulated to be a first voltage sampling signal and is sent to the control sub-circuit, and the control sub-circuit responds to the first voltage sampling signal to send a third control signal to the output switch circuit so as to control the output switch circuit to disconnect the power input end and the power output end.

The current sampling sub-circuit comprises a current pickup unit, a differential amplification unit and a first comparison unit, wherein the current pickup unit is coupled between a power input end and an output switch circuit and is coupled with the differential amplification unit; the current pickup unit samples a current input signal on the power input end, adjusts the current input signal into a first voltage signal and sends the first voltage signal to the differential amplification unit, so that the differential amplification unit adjusts the first voltage signal into a second voltage signal and sends the second voltage signal to the first end of the control sub-circuit and the first comparison unit, and therefore the first comparison unit compares the second voltage signal with the second voltage source to obtain a first voltage sampling signal and sends the first voltage sampling signal to the second end of the control sub-circuit.

The regulating circuit further comprises a voltage comparing sub-circuit, wherein the voltage comparing sub-circuit is coupled with the power output end, the first comparing unit, the control sub-circuit, an external third voltage source and an external fourth voltage source, so as to sample and obtain a voltage output signal on the power output end, and receives a first voltage sampling signal sent by the first comparing unit, so as to respectively compare the voltage output signal with the third voltage source and the fourth voltage source to obtain a third voltage signal and a fourth voltage signal, and perform first logic operation on the third voltage signal and the fourth voltage signal to obtain a second voltage sampling signal, so that the second voltage sampling signal is sent to a third end of the control sub-circuit, and performs second logic operation on the second voltage sampling signal and the first voltage sampling signal, so that the control sub-circuit responds to the first voltage sampling signal and/or the second voltage sampling signal to be a set level signal, and sends a third control signal to the output switch circuit.

The voltage comparison sub-circuit comprises a second comparison unit, a third comparison unit, a first logic unit, a second logic unit and a third logic unit, wherein the second comparison unit is coupled with the power output end, the third voltage source and the first logic unit; the second comparison unit samples to obtain a voltage output signal on the power supply output end so as to compare the voltage output signal with a third voltage source to obtain a third voltage signal, and the third comparison unit receives the voltage output signal sent by the second comparison unit so as to compare the voltage output signal with a fourth voltage source to obtain a fourth voltage signal; the first logic unit receives the third voltage signal sent by the second comparison unit, the second logic unit receives the fourth voltage signal sent by the third comparison unit, so that first logic operation is performed on the third voltage signal and the fourth voltage signal through the first logic unit and the second logic unit to obtain a second voltage sampling signal, and the second voltage sampling signal is sent to a third end of the control sub-circuit; the third logic unit receives the second voltage sampling signal sent by the second logic unit and the first voltage sampling signal sent by the first comparison unit, so as to perform second logic operation on the first voltage sampling signal and the second voltage sampling signal.

The regulating circuit further comprises a driving sub-circuit, wherein the driving sub-circuit is coupled with the control sub-circuit and the output switch circuit, so as to receive the control signal sent by the control sub-circuit, and send the control signal to the output switch circuit after power amplification regulation is carried out on the control signal.

In order to solve the technical problem, another technical scheme adopted by the application is as follows: there is provided a power conditioning method for use in a load switching circuit as claimed in any one of the preceding claims, the power conditioning method comprising: sampling to obtain a voltage output signal which is output to an external load circuit; the voltage output signal is adjusted in response to a frequency change of the voltage output signal such that the voltage output signal does not exceed a first set threshold.

In order to solve the technical problem, another technical scheme adopted by the application is as follows: providing a power conditioning device, wherein the power conditioning device comprises a power supply circuit and a load switching circuit which are coupled; wherein the load switching circuit is any one of the load switching circuits described above.

The beneficial effects of this application are: compared with the prior art, the power supply input end in the load switch circuit is used for being coupled with an external first voltage source so as to supply power to the external load circuit through the power supply output end, the output switch circuit is coupled between the power supply input end and the power supply output end, the adjusting circuit is coupled with the output switch circuit and the power supply output end so as to be used for sampling to obtain a voltage output signal on the power supply output end, and the adjusting circuit is used for adjusting and sending a control signal to the output switch circuit in response to the frequency change of the voltage output signal so that the output switch circuit responds to the control signal to adjust the voltage output signal, and therefore the voltage output signal does not exceed a first set threshold value, damage to the load switch circuit caused by the conditions of overvoltage and/or overcurrent and/or signal interference which can occur is avoided, adverse effects on the load circuit are effectively avoided, and the operation reliability of a corresponding power supply system is improved.

Drawings

For a clearer description of the technical solutions in the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

fig. 1 is a schematic diagram of a first embodiment of a load switching circuit of the present application;

FIG. 2 is a schematic diagram of a second embodiment of a load switching circuit of the present application;

FIG. 3 is a schematic diagram of an embodiment of an output switch circuit of the load switch circuit of FIG. 2;

fig. 4 is a schematic structural diagram of a third embodiment of the load switching circuit of the present application;

fig. 5 is a schematic diagram of a fourth embodiment of a load switching circuit of the present application;

fig. 6 is a schematic diagram of a fifth embodiment of a load switching circuit of the present application;

FIG. 7 is a schematic diagram of one embodiment of a sub-circuit of the load switch circuit portion of FIG. 6;

FIG. 8 is a schematic diagram of an embodiment of a current sampling sub-circuit in the load switch circuit of FIG. 6;

FIG. 9 is a schematic diagram of a control sub-circuit of the load switch circuit of FIG. 6;

FIG. 10 is a schematic diagram of a voltage comparison sub-circuit in the load switch circuit of FIG. 6;

FIG. 11 is a schematic diagram of a driving sub-circuit of the load switch circuit of FIG. 6;

FIG. 12 is a schematic flow chart of a first embodiment of the power conditioning method of the present application;

fig. 13 is a schematic structural view of an embodiment of the power conditioning apparatus of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms "first," "second," "third," and the like in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, back … …) in this embodiment are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

The present application will be described in detail with reference to the drawings and embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a load switching circuit of the present application. In the present embodiment, the load switching circuit 10 includes: a power supply input 11, a power supply output 12, an output switching circuit 13, and a regulating circuit 14.

The load switch circuit 10 provided in the present application is particularly applied to a power supply system, such as a power supply device of a communication device, and is particularly disposed between a power supply source and the load circuit 102 to provide isolation protection for load power supply. Of course, in other embodiments, the load switch circuit 10 may be applied to any other reasonable electronic device such as a charging device, and the present embodiment is not limited thereto.

Specifically, the power input terminal 11 is configured to be coupled to an external first voltage source 101, and the power output terminal 12 is configured to be coupled to an external load circuit 102, so that the power input terminal 11 is utilized to access the first voltage source 101 and provide the power to the load circuit 102 through the power output terminal 12, thereby realizing power supply to the load circuit 102.

The output switch circuit 13 is correspondingly coupled between the power input terminal 11 and the power output terminal 12 to isolate the power input terminal 11 from the power output terminal 12, so that the electrical connection between the power input terminal 11 and the power output terminal 12 can be turned on or off when the output switch circuit 13 triggers on/off, so as to avoid the adverse effect of the first voltage source 101 and the load circuit 102 on each other.

Further, the adjusting circuit 14 is coupled to the output switch circuit 13 and the power output terminal 12, and is used for sampling a voltage output signal at the power output terminal 12, and the voltage output signal can be specifically understood as a power supply voltage signal outputted to the load switch circuit 102 by the load switch circuit 10 when the load switch circuit 102 is connected to the load switch circuit 10, and can be also understood as a voltage signal fed back to the power output terminal 12 by the load switch circuit 102 under the influence of an external interference signal or load instability.

When the voltage output signal is obtained by sampling, the adjusting circuit 14 sends a control signal to the output switch circuit 13, so as to adjust the on-off state of the output switch circuit 13 by using the control signal, and further adjust the voltage output signal output to the load circuit 102 by the power output end 12 through the output switch circuit 13; and the regulating circuit 14 is in particular also capable of regulating the control signal in response to a frequency variation of the voltage output signal such that the output switching circuit 13 limits the voltage output signal within the first set threshold value, i.e. even if the voltage output signal does not exceed the first set threshold value.

It will be appreciated that, in the case of switching in the load circuit 102, especially in the case of switching in a heavy load and/or a capacitive load, or in the case of receiving an impact current at the load end, such as a lightning current, or in the case of a circuit failure, the load switch circuit 10 will generally trigger an overvoltage and/or overcurrent and/or signal disturbance at the power output end 12, and will also generally represent an unstable change state of the frequency of the voltage output signal at the power output end 12, and in order to avoid that the feedback of the voltage output signal affects the normal operation of the system power supply including the first voltage source 101 for providing the power to the load switch circuit 10, it is necessary to timely disconnect the electrical connection between the power input end 11 and the power output end 12 through the output switch circuit 13, or adjust the ratio of the on-off time between the power input end 11 and the power output end 12, so as to reduce the voltage output signal as much as possible under the premise of ensuring the power supply safety, or normal power supply, so as to limit the voltage output signal within the first set threshold.

The first set threshold is a threshold voltage and a current value that do not affect normal operation of any other reasonable elements in the first voltage source 101, the output switch circuit 13 and the load switch circuit 10, and is specifically determined by an actual circuit configuration and an application scenario, which is not limited in this application.

It is noted that "coupled" as used herein is meant to include any means of direct or indirect connection. Thus, if a first circuit is coupled to a second circuit, it is intended that the first circuit be directly connected to the second circuit by an electrical connection or a signal connection such as wireless transmission, optical transmission, or the like, or be indirectly connected to the second circuit electrically or by other circuits or connection means.

In the above solution, the adjusting circuit 14 is configured to adjust the sending control signal to the output switch circuit 13 in response to the frequency change of the voltage output signal, so that the output switch circuit 13 adjusts the voltage output signal in response to the control signal, so that the voltage output signal does not exceed the first set threshold, and damage to the load switch circuit 10 caused by possible situations such as overvoltage and/or overcurrent and/or signal interference is avoided, thereby effectively avoiding adverse effects on the load circuit 102; and when the load switch circuit 10 fails, or the load circuit 102 feeds back the input fault current to the load switch circuit 10, the regulating circuit 14 can also control the output switch circuit 13 to disconnect the connection between the power input end 11 and the power output end 12 so as to effectively realize power-on buffering and input surge blocking, and meanwhile, when a later-stage circuit fails, the load switch circuit 10 can also be effectively separated so as to realize the function of fault isolation protection, thereby effectively improving the reliability of the system power operation including the first voltage source 101 for providing power for the load switch circuit 10.

In an embodiment, the control signal corresponds to a pulse width modulation signal in a set start time of the power output terminal 12 outputting the voltage output signal to the load circuit 102, that is, in a set start time of the load circuit 102 connected to the power output terminal 12, the control signal is specifically a pulse width modulation signal, and the adjusting circuit 14 is specifically configured to gradually increase a duty cycle of the pulse width modulation signal in response to a frequency variation amplitude of the voltage output signal in a set start time every interval for a set duration, and adjust an increase amplitude of the duty cycle according to a set function, that is, in a set duration every interval in the set start time, the increase amplitude of the duty cycle is specifically a set function with the frequency variation amplitude of the voltage output signal until the duty cycle is adjusted to be 100%.

It will be appreciated that to ensure that the voltage output signal is limited to the first set threshold, the soft start effect may be achieved by gradually increasing the duty cycle of the pwm signal during the set start time of the turn-on of the load circuit 102, and timely adjusting the increase of the duty cycle in response to the frequency change of the voltage output signal, so as to avoid the impact of the surge current on the power output 12 during the hard turn-on, and reduce the load on the power input 11.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of the load switching circuit of the present application. The load switching circuit in this embodiment is different from the first embodiment of the load switching circuit provided in this application in that the output switching circuit 23 in the load switching circuit 20 specifically further includes a switching sub-circuit 231 and an energy absorbing sub-circuit 232.

It will be appreciated that to ensure reliable triggering of the switching sub-circuit 231 and sensitivity of the triggering, the switching sub-circuit 231 typically has a safe threshold voltage, current, so that a corresponding energy absorbing sub-circuit 232 needs to be provided for the switching sub-circuit 231 to absorb the portion of the switching sub-circuit 231 that can withstand voltages and currents exceeding the safe threshold voltage.

Specifically, the switch sub-circuit 231 is coupled to the power input terminal 21, the power output terminal 22, and the energy absorbing sub-circuit 232; the switching sub-circuit 231 is specifically configured to receive the first voltage source 101 sent by the power input terminal 21, the control signal sent by the adjusting circuit 24, and the first feedback signal sent by the power output terminal 22, so as to send the first voltage source 101 and/or a portion of the first feedback signal exceeding the second set threshold to the energy absorbing sub-circuit 232, that is, when the power output terminal 22 suffers from overvoltage, such as lightning current or on-load surge current, the energy absorbing sub-circuit 232 can store energy for a portion exceeding the safe threshold voltage and current of the switching sub-circuit 231, so as to avoid damage to the switching sub-circuit 231.

And the switch sub-circuit 231 is further capable of triggering on or off in response to the control signal to regulate the first voltage source 101 to the power input terminal 21 and to provide the regulated first voltage source 101 to the power output terminal 22 for output to the load circuit 102.

Further, in an embodiment, the output switch circuit 23 specifically further includes a protection sub-circuit 233, where the protection sub-circuit 233 is coupled between the switch sub-circuit 231 and the adjusting circuit 24, and specifically coupled between the control terminal of the switch sub-circuit 231, such as the gate of the switch tube, and the adjusting circuit 24, for receiving a portion of the control signal sent by the switch sub-circuit 231 exceeding the third set threshold value, so as to protect the control terminal of the switch sub-circuit 231.

It is to be understood that the second set threshold and the third set threshold are specifically obtained by reasonably setting the safe threshold voltage and the safe threshold current of the switch sub-circuit 231, which is not limited in this application.

In another embodiment, the output switch circuit 23 may be replaced by a buck chip to achieve a corresponding function of the output switch circuit 23, which is not limited in this application.

With continued reference to fig. 3, fig. 3 is a schematic diagram illustrating an embodiment of an output switch circuit in the load switch circuit of fig. 2 of the present application.

In one embodiment, the switching sub-circuit 231 further includes a first switching tube Q1, a second switching tube Q2 and a third switching tube Q3, and the energy absorbing sub-circuit 232 further includes a first transient diode Dx1, a second transient diode Dx2, a third transient diode Dx3, a first resistor R1, a first capacitor C1 and a second capacitor C2, and the protection sub-circuit 233 further includes a second resistor R2, a protection diode Db1 and a third capacitor C3.

The first end of the first switching tube Q1 is coupled to the first end of the second switching tube Q2, the first end of the third switching tube Q3, the first end of the first transient diode Dx1, the first end of the second transient diode Dx2, the first end of the first capacitor C1, the first end of the second resistor R2, the first end of the protection diode Db1, the first end of the third capacitor C3, and the power input end 21; the second end of the first switching tube Q1 is coupled to the second end of the second switching tube Q2, the second end of the third switching tube Q3, the second end of the first transient diode Dx1, the first end of the third transient diode Dx3 and the power output end 22; the third terminal of the first switching tube Q1 is coupled to the third terminal of the second switching tube Q2, the third terminal of the third switching tube Q3, the second terminal of the second resistor R2, the second terminal of the protection diode Db1, the second terminal of the third capacitor C3, and the adjusting circuit 24; the second terminal of the second transient diode Dx2 is coupled to the first terminal of the first resistor R1, the second terminal of the first resistor R1 is coupled to the second terminal of the second capacitor C2 and the second terminal of the third transient diode Dx3, and the second terminal of the first capacitor C1 is coupled to the first terminal of the second capacitor C2.

It can be understood that the output switch circuit 23 specifically realizes the on-off function between the power input end 21 and the power output end 22 through the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3 correspondingly, and utilizes the first transient diode Dx1, the second transient diode Dx2, the third transient diode Dx3, the first resistor R1, the first capacitor C1 and the second capacitor C2 to absorb the first voltage source 101 and/or the first feedback signal which are sent to the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3 and exceed the second set threshold value so as to form protection for the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3; and the control ends of the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 can be protected by the second resistor R2, the protection diode Db1 and the third capacitor C3.

Optionally, the first switching tube Q1, the second switching tube Q2, and the third switching tube Q3 may specifically include any reasonable switching device such as a triode, a P-type thin film transistor, an N-type thin film transistor, and a field effect transistor, which is not limited in this application.

It should be noted that, when the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are transistors, the first end is a collector, the second end is an emitter, and the third end is a base; alternatively, the first end is an emitter, the second end is a collector, and the third end is a base. When the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are thin film transistors or field effect transistors, the first end is a drain electrode, the second end is a source electrode and the third end is a gate electrode; or the first end is a source electrode, the second end is a drain electrode, and the third end is a grid electrode.

When each switching transistor is a thin film transistor or a field effect transistor, a composite transistor or a single transistor may be used.

It should be understood that, in the present embodiment, the power input terminal 21, the power output terminal 22 and the adjusting circuit 24 are the same as the power input terminal 11, the power output terminal 12 and the adjusting circuit 14, respectively, and detailed descriptions thereof are omitted herein with reference to fig. 1.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a third embodiment of the load switching circuit of the present application. The load switch circuit in this embodiment is different from the first embodiment of the load switch circuit provided in this application in that the power input terminal 31 in the load switch circuit 30 specifically further includes a first power input terminal 311 and a second power input terminal 312, and the power output terminal 32 further includes a first power output terminal 321 and a second power output terminal 322.

It is understood that the first power input terminal 311 and the second power input terminal 312 are respectively coupled to the first end and the second end of the first voltage source 101, so that when the first voltage source 101 is a dc power source, the first power input terminal 311 and the second power input terminal 312 are respectively coupled to the positive pole and the negative pole of the first voltage source 101, or the negative pole and the positive pole of the first voltage source 101; similarly, the first power output 321 and the second power output 322 are respectively coupled to the first terminal and the second terminal of the load circuit 102, that is, the positive pole and the negative pole of the load circuit 102, or the negative pole and the positive pole of the load circuit 102.

The output switch circuit 33 is specifically coupled between the second power input terminal 312 and the second power output terminal 322.

In an embodiment, the load switch circuit 30 further includes a port decoupling circuit 35, and the port decoupling circuit 35 is coupled between the output switch circuit 33 and the second power output terminal 322, for receiving the second feedback signal sent by the second power output terminal 322 and limiting the second feedback signal to be within a fourth set threshold.

It should be noted that, the second feedback signal may be understood as an over-voltage and over-current signal fed back to the output switch circuit 33 by the second power output terminal 322 when the power output terminal 32 is struck by lightning or is turned on under load, so that when the port decoupling circuit 35 is coupled between the output switch circuit 33 and the second power output terminal 322, the port decoupling circuit 35 can be used to absorb the energy of the portion of the second feedback signal of the fourth set threshold, that is, the safety threshold, so as to protect the output switch circuit 33.

Alternatively, the port decoupling circuit 35 may be an inductive element, or a combination circuit of an inductance and any reasonable element such as a resistor and/or a capacitor, which is not limited in this application.

Further, in an embodiment, the load switch circuit 30 further includes a freewheel circuit 36, wherein the freewheel circuit 36 is coupled between the first power output terminal 321 and the port decoupling circuit 35, so that when the load circuit 102 inputs the negative feedback signal to the first power output terminal 321, the freewheel circuit 36 cooperates with the port decoupling circuit 35 to receive the negative feedback signal, that is, the freewheel circuit 36 is configured to provide a freewheel loop for the negative feedback signal, so as to prevent the negative feedback signal from flowing to the output switch circuit 33, and adversely affecting the output switch circuit 33.

And when the port decoupling circuit 35 discharges its stored energy, the freewheel circuit 36 is further configured to receive the stored energy discharge current of the port decoupling circuit 35, that is, to provide a freewheel circuit for the stored energy discharge of the port decoupling circuit 35.

It should be noted that the negative feedback signal may specifically correspond to a lightning strike overvoltage signal having a negative value, which is input to the load switch circuit 30 from the first power output end 321, and the energy storage and discharge of the port decoupling circuit 35 may specifically correspond to a discharging process performed during a set starting time of the load switch circuit 30 accessing the load circuit 102, in which the energy storage is performed on the on-load surge current, and the steady-state power supply is restored.

It will be appreciated that the freewheel circuit 36 may specifically clamp lightning strike overvoltages during lightning protection and may be multiplexed into a freewheel loop for the stored energy current during on-load starting.

Alternatively, the flywheel circuit 36 may be a flywheel diode, or any reasonable switching device such as a mosfet, a thyristor, etc., which is not limited in this application.

Optionally, the freewheel circuit 36 includes at least two freewheel diodes connected in parallel, and a first end of each freewheel diode is coupled between the output switch circuit 33 and the port decoupling circuit 35, and a second end of each freewheel diode is coupled to the first power output end 321, so as to achieve a better clamping effect on an overvoltage through a plurality of freewheel diodes connected in parallel, and provide freewheel loops for the energy storage discharge current more stably, where the number of freewheel diodes is determined specifically by practical application scenarios, and the application is not limited thereto.

In an embodiment, the load switch circuit 30 specifically further includes a lightning protection circuit 37, where the lightning protection circuit 37 is coupled between the first power output 321 and the second power output 322, and is configured to receive a third feedback signal sent by the first power output 321 and/or the second power output 322, and limit the third feedback signal to be within a fourth set threshold.

Similarly, the third feedback signal can be understood as an overvoltage and an overcurrent caused by the lightning strike or the on-load turn-on of the power output end 32, so that the first power output end 321 and/or the second power output end 322 feed back to the output switch circuit 33, and the lightning protection circuit 37 is utilized to implement the clamping function on the first link of the third feedback signal, so as to protect the output switch circuit 33.

It is understood that the first feedback signal, the second feedback signal and the third feedback signal may be specifically understood as the same feedback signal, or different feedback signals, which is not limited in this application.

Optionally, the lightning protection circuit 37 may be a lightning protection device, or any reasonable element or combination circuit such as a voltage regulator, a transient diode, a varistor, etc., which is not limited in this application.

Therefore, by adopting the lightning protection circuit 37, the lightning surge energy can be effectively absorbed, the post-stage circuit is protected, the port decoupling circuit 35 and the follow current circuit 36 are additionally arranged for the output switch circuit 33 so as to carry out voltage clamping absorption on the power output end 32 and carry out voltage clamping protection on the gate driving voltage of each switch tube, so that overvoltage damage of each switch tube when a loop is cut off is avoided, and the protection effect of the circuit and the reliability of a power supply system are further improved.

It should be understood that in the present embodiment, the output switch circuit 33 and the adjusting circuit 34 are the same as the output switch circuit 13 and the adjusting circuit 14, respectively, and detailed descriptions thereof are omitted herein with reference to fig. 1.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a load switching circuit according to a fourth embodiment of the present application. The load switch circuit in this embodiment is different from the first embodiment of the load switch circuit provided in this application in that the adjusting circuit 44 in the load switch circuit 40 specifically further includes a current sampling sub-circuit 441 and a control sub-circuit 442.

Specifically, the current sampling sub-circuit 441 is coupled between the power input terminal 41 and the output switch circuit 43, and is coupled to the control sub-circuit 442 for sampling a current input signal on the power input terminal 41, and adjusting the current input signal to a first voltage sampling signal for sending to the control sub-circuit 442.

And the control sub-circuit 442 can send a third control signal to the output switch circuit 43 in response to the first voltage sampling signal when the first voltage sampling signal is a set level signal, so as to trigger the output switch circuit 43 to be turned off by using the third control signal, so as to disconnect the power input terminal 41 from the power output terminal 42.

It can be understood that the set level signal may be a high level signal or a low level signal, and specifically corresponds to a level signal of the first voltage sampling signal that is sampled and converted by the current sampling sub-circuit 441 and represents the current fault state when the current input signal on the power input terminal 41 is in a fault state, for example, when the current input signal is an excessive current or a short-circuit current, so as to trigger the output switch circuit 43 to be turned off; and when the first voltage sampling signal is not the set level signal, the output switch circuit 43 is triggered to be turned on so as to perform normal power supply.

In another embodiment, the control sub-circuit 442 can also send the first voltage sampling signal or the current input signal sent by the current sampling sub-circuit 441 to a background computer or a display circuit in the load circuit 102 for displaying to a user for monitoring and operation by the user.

Optionally, the control sub-circuit 442 may specifically include one or more of an MCU (Micro Control Unit ) circuit, a CPU (Central Processing Unit, central processing unit), a single chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, discrete hardware, and any other reasonable circuit unit for forming a circuit having a program and a signal processing function, which is not limited in this application.

In an embodiment, the current sampling sub-circuit 441 further includes a current pickup unit 4411, a differential amplifying unit 4412, and a first comparing unit 4413, wherein the current pickup unit 4411 is coupled between the power input terminal 41 and the output switch circuit 43 and coupled to the differential amplifying unit 4412, the differential amplifying unit 4412 is coupled to the first comparing unit 4413 and the first terminal of the control sub-circuit 442, and the first comparing unit 4413 is coupled to an external second voltage source (not shown) and the second terminal of the control sub-circuit 442.

The current pick-up unit 4411 is specifically configured to sample and obtain a current input signal at the power input terminal 41, adjust the current input signal to a first voltage signal, and send the first voltage signal to the differential amplifying unit 4412, so that the differential amplifying unit 4412 adjusts the first voltage signal to a second voltage signal and sends the second voltage signal to the first terminal of the control sub-circuit 442, so that the control sub-circuit 442 is sent to a background computer or a display circuit in the load circuit 102, so as to display the current input signal to a user for monitoring and operation.

The differential amplifying unit 4412 is further configured to send a second voltage signal to the first comparing unit 4413, so that the first comparing unit 4413 compares the second voltage signal with a second voltage source to obtain a first voltage sampling signal, and sends the first voltage sampling signal to the second end of the control sub-circuit 442, so that the control sub-circuit 442 monitors the fault state of the load switch circuit 40 by using the first voltage sampling signal, and when the first voltage sampling signal is a set level signal, the output switch circuit 43 is triggered to be turned off, and when the first voltage sampling signal is not the set level signal, the output switch circuit 43 is triggered to be turned on, so as to perform fault load-off isolation or normal power supply.

Further, in an embodiment, the adjusting circuit 44 specifically further includes a voltage comparing sub-circuit 443, wherein the voltage comparing sub-circuit 443 is coupled to the power output terminal 42, the first comparing unit 4413, the control sub-circuit 442, and an external third voltage source (not shown) and a fourth voltage source (not shown) for sampling the voltage output signal at the power output terminal 42 and receiving the first voltage sampling signal sent by the first comparing unit 4413 in the current sampling sub-circuit 441.

The voltage comparison sub-circuit 443 specifically compares the voltage output signal with a third voltage source to obtain a third voltage signal, and compares the voltage output signal with a fourth voltage source to obtain a fourth voltage signal, and then performs a first logic operation on the third voltage signal and the fourth voltage signal to obtain a second voltage sampling signal, so as to send the second voltage sampling signal to a third terminal of the control sub-circuit 442, so that the control sub-circuit 442 can monitor the operation state of the load switch circuit 40 based on the second voltage sampling signal, and send a third control signal to the output switch circuit 43 to trigger the output switch circuit 43 to turn off when the second voltage sampling signal is determined to be a set level signal, and trigger the output switch circuit 43 to turn on when the first voltage sampling signal is not the set level signal, so as to perform fault load-off isolation or normal power supply.

In another embodiment, the voltage comparison sub-circuit 443 may further perform a second logic operation with the first voltage sampling signal when obtaining the second voltage sampling signal, so that the control sub-circuit 442 responds to the first voltage sampling signal and/or the second voltage sampling signal as the set level signal, that is, when at least one of the first voltage sampling signal and the second voltage sampling signal generates the set level signal, sends a third control signal to the output switch circuit 43 to trigger the output switch circuit 43 to be turned on.

The third voltage source and the fourth voltage source can be understood as providing terminals of different level signals, for example, the third level signal and the fourth level signal respectively correspond to each other, and the voltage of the third level signal is greater than that of the fourth level signal; the first logic operation may specifically correspond to that when the voltage output signal is greater than the third level signal or less than the fourth level signal, the second voltage sampling signal obtained by the operation is a set level signal; when the voltage output signal is not greater than the third level signal and not less than the fourth level signal, the calculated second voltage sampling signal is not a set level signal, so that the control sub-circuit 442 can monitor the state of the load switch circuit 40 according to whether the second voltage sampling signal is a set level signal, so as to determine whether to trigger the output switch circuit 43 to be turned off.

The second logic operation may specifically correspond to a logical AND, i.e. an AND gate operation; the control sub-circuit 442 may specifically perform the second logic operation by itself or by the and gate operation unit in the voltage comparison sub-circuit 443 when receiving the first voltage sampling signal sent by the current sampling sub-circuit 441 and the second voltage sampling signal sent by the voltage comparison sub-circuit 443.

Further, in an embodiment, the voltage comparison sub-circuit 443 specifically further includes a second comparison unit 4431, a third comparison unit 4432, a first logic unit 4433, a second logic unit 4434 and a third logic unit 4435, the second comparison unit 4431 is coupled to the power output end 42, the third voltage source and the first logic unit 4433, the third comparison unit 4432 is coupled to the second comparison unit 4431, the fourth voltage source and the second logic unit 4434, the first logic unit 4433 is coupled to the second logic unit 4434, the third logic unit 4435 and the third end of the control sub-circuit 442, and the third logic unit 4435 is coupled to the first comparison unit 4413.

The second comparing unit 4431 is configured to sample the voltage output signal at the power output terminal 42 to compare the voltage output signal with a third voltage source to obtain a third voltage signal, and the third comparing unit 4432 is configured to receive the voltage output signal sent by the second comparing unit 4431 to compare the voltage output signal with a fourth voltage source to obtain a fourth voltage signal.

The first logic unit 4433 receives the third voltage signal sent by the second comparing unit 4431, the second logic unit 4434 receives the fourth voltage signal sent by the third comparing unit 4432, so that the first logic unit 4433 and the second logic unit 4434 can perform a first logic operation on the third voltage signal and the fourth voltage signal to obtain a second voltage sampling signal, and send the second voltage sampling signal to the third terminal of the control sub-circuit 442.

The third logic unit 4435 is configured to receive the second voltage sampling signal sent by the second logic unit 4434 and the first voltage sampling signal sent by the first comparison unit 4413, so as to perform a second logic operation on the first voltage sampling signal and the second voltage sampling signal.

In an embodiment, the adjusting circuit 44 specifically further includes a driving sub-circuit 444, and the driving sub-circuit 444 is coupled to the control sub-circuit 442 and the output switch circuit 43, so as to receive the control signal sent by the control sub-circuit 442, perform power amplification adjustment on the control signal, and send the control signal to the output switch circuit 43.

It will be appreciated that, to ensure that the control sub-circuit 442 corresponds to the control signal sent to the output switch circuit 43, the output switch circuit 43 can be effectively triggered to operate, and a power amplifier is usually required to amplify the control signal to meet the requirement of the driving signal.

It should be understood that, in the present embodiment, the power input terminal 41, the power output terminal 42 and the output switch circuit 43 are respectively connected to the power input terminal 11, the power output terminal 12 and the output switch circuit 13, and detailed descriptions thereof are omitted herein with reference to fig. 1.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a fifth embodiment of the load switching circuit of the present application.

It is understood that in the present embodiment, the load switch circuit 50 may specifically include a power supply input terminal 51, a power supply output terminal 52, an output switch circuit 53, a regulating circuit 54, a port decoupling circuit 55, a freewheel circuit 56, and a lightning protection circuit 57; the power input terminal 51 specifically further includes a first power input terminal 511 and a second power input terminal 512, the power output terminal 52 specifically further includes a first power output terminal 521 and a second power output terminal 522, the output switch circuit 53 specifically further includes a switch sub-circuit 531, an energy absorbing sub-circuit 532, and a protection sub-circuit 533, the adjusting circuit 54 specifically further includes a current sampling sub-circuit 541, a control sub-circuit 542, a voltage comparing sub-circuit 543, and a driving sub-circuit 544, the current sampling sub-circuit 541 specifically further includes a current pickup unit 5411, a differential amplifying unit 5412, and a first comparing unit 5413, and the voltage comparing sub-circuit 543 specifically further includes a second comparing unit 5431, a third comparing unit 5432, a first logic unit 5433, a second logic unit 5434, and a third logic unit 5435.

It should be noted that, in the present embodiment, each sub-circuit unit in the load switch circuit 50 is identical to each sub-circuit unit with the same name as that in fig. 1-5 and the corresponding connection relationship and function, and detailed descriptions are omitted herein with reference to fig. 1-5 and related text.

Correspondingly, the lightning protection principle of the load switch circuit 50 is that when the second power output end 522 bears a forward lightning strike, the port voltage is clamped under a certain voltage under the action of the lightning protection circuit 57 and the port decoupling circuit 55, and after the second voltage sampling signal is obtained by the voltage comparison sub-circuit 543, the output switch circuit 53 is triggered to be turned off, so that the surge lightning pulse current passes through the port decoupling circuit 55 and the follow current circuit 56, and the impact on the output switch circuit 53 and the power input end 51 is avoided.

When the second power output terminal 522 receives a negative lightning strike, the lightning protection circuit 57 will trigger the action, clamp the port voltage within a certain voltage under the cooperation of the port decoupling circuit 55 and the follow current circuit 56, and trigger the voltage comparison sub-circuit 543 to turn off the output switch circuit 53 in real time, and make the corresponding pulse current pass through the follow current circuit 56, thereby protecting the output switch unit and the power input terminal 51 from being damaged by impact.

Referring to fig. 7-11, fig. 7 is a schematic diagram of an embodiment of a sub-circuit of the load switch circuit portion in fig. 6, fig. 8 is a schematic diagram of an embodiment of a current sampling sub-circuit in the load switch circuit in fig. 6, fig. 9 is a schematic diagram of an embodiment of a control sub-circuit in the load switch circuit in fig. 6, fig. 10 is a schematic diagram of an embodiment of a voltage comparison sub-circuit in the load switch circuit in fig. 6, and fig. 11 is a schematic diagram of an embodiment of a driving sub-circuit in the load switch circuit in fig. 6.

In a specific embodiment, the load switching circuit 50 specifically includes: a first switching tube Q1, a second switching tube Q2 and a third switching tube Q3, a first transient diode Dx1, a second transient diode Dx2 and a third transient diode Dx3, a protection diode Db1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, and a twenty-sixth resistor R26, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, a thirty-first capacitor C30, a thirty-first capacitor C31, a thirty-second capacitor C32, a thirty-third capacitor C33, a thirty-fourth capacitor C34, a thirty-fifth capacitor C35, a thirty-sixth capacitor C36, a thirty-seventh capacitor C37, a thirty-eighth capacitor C39 and a thirty-eighth capacitor C40, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the seventh diode D7, the eighth diode D8, the ninth diode D9, the tenth diode D10, the eleventh diode D11, the twelfth diode D12 and the thirteenth diode D13, the first inductor L1 and the second inductor L2, the operational amplifier YF1, the first comparator BJ1, the second comparator BJ2 and the third comparator BJ3, the lightning protection device BL, the control chip U1 and the driving chip U2 are respectively included in each sub-circuit and unit in fig. 6, specifically please refer to fig. 6-11, and the connection relations of the corresponding components are also shown in fig. 6-11, which are not repeated here.

It will be appreciated that the load switch circuit 50 receives the positive electrode 0V and the negative electrode-48V of the first voltage source by the first power input terminal 511 and the second power input terminal 512, and provides the positive electrode 0V and the negative electrode-48V to the first terminal vout+ and the second terminal Vout-of the load circuit through the first power output terminal 521 and the second power output terminal 522 after passing through the output switch circuit 53, so as to sample the current and the voltage input by the first voltage source and/or the current and the voltage fed back by the load circuit at the regulating circuit 54 based on the current sampling sub-circuit 541 and the voltage comparing sub-circuit 543, and regulate the switch state of the output switch circuit 53, so as to limit the voltage output signal provided to the load circuit within the first set threshold, thereby avoiding damage to the load switch circuit caused by possible overvoltage and/or overcurrent, and effectively avoiding adverse effects on the load circuit.

Wherein the current sampling sub-circuit 541 specifically obtains a first voltage sampling signal by using a first voltage source having a level of-48V and a second voltage source having a level of 3.3V; and the voltage comparing sub-circuit 543 obtains a second voltage sampling signal by using a third voltage source having a level of 2.6V and a fourth voltage source having a level of 1.4V, so that the control sub-circuit 542 adjusts the switching state of the output switching circuit 53 based on the first voltage sampling signal and the second voltage sampling signal.

Referring to fig. 12, fig. 12 is a schematic flow chart of a first embodiment of the power adjustment method of the present application. Specifically, the method may include the steps of:

s61: sampling to obtain a voltage output signal which is output to an external load circuit.

It can be understood that the power regulation method in this embodiment is specifically a method that, when the load switch circuit receives an external first voltage source, the first voltage source is regulated to provide the external load circuit with the regulated first voltage source. The load switch circuit comprises a power input end, a power output end, an output switch circuit and a regulating circuit, wherein the power input end is used for being coupled with an external first voltage source, the power output end is used for being coupled with an external load circuit, the output switch circuit is coupled between the power input end and the power output end, and the regulating circuit is coupled with the output switch circuit and the power output end.

Specifically, the regulating circuit is used for sampling to obtain a voltage output signal on the power supply output terminal.

S62: the voltage output signal is adjusted in response to a frequency change of the voltage output signal such that the voltage output signal does not exceed a first set threshold.

Further, the regulation circuit regulates the transmission of the control signal to the output switching circuit in response to a frequency change of the voltage output signal, so that the output switching circuit regulates the voltage output signal in response to the control signal so that the voltage output signal does not exceed the first set threshold.

It should be noted that, the load switch circuit described in this embodiment is the load switch circuit 10, the load switch circuit 20, the load switch circuit 30, the load switch circuit 40 or the load switch circuit 50 described in any one of the above embodiments, and based on this, the power adjustment method may specifically implement any other reasonable method, and detailed descriptions thereof will be omitted herein with reference to fig. 1-11 and related text.

Referring to fig. 13, fig. 13 is a schematic structural diagram of an embodiment of the power conditioning apparatus of the present application. In this embodiment, the power conditioning device 70 includes a power supply circuit 71 and a load switching circuit 72 coupled together.

Alternatively, the power conditioning device 70 may be specifically a power supply device of a communication device, such as a communication power supply device, a communication base station device, or any reasonable electronic device such as a charging device, which is not limited in this application.

It should be noted that the load switch circuit 72 in this embodiment is 10, the load switch circuit 20, the load switch circuit 30, the load switch circuit 40 or the load switch circuit 50 in any of the above embodiments, and detailed descriptions thereof will be omitted herein with reference to fig. 1-11 and related text.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims

1. A load switching circuit, the load switching circuit comprising:

the power supply input end is used for being coupled with an external first voltage source;

the power supply output end is used for being coupled with an external load circuit;

an output switching circuit coupled between the power input and the power output;

the adjusting circuit is coupled with the output switching circuit and the power supply output end to sample and obtain a voltage output signal on the power supply output end, and adjusts and sends a control signal to the output switching circuit in response to the frequency change of the voltage output signal so that the output switching circuit adjusts the voltage output signal in response to the control signal, and therefore the voltage output signal does not exceed a first set threshold value; the control signal corresponds to a pulse width modulation signal in a set starting time of the power output end outputting the voltage output signal to the load circuit, the regulating circuit responds to the frequency change amplitude of the voltage output signal in the set starting time at each interval for a set duration to increase the duty ratio of the pulse width modulation signal, and the increase amplitude of the duty ratio is adjusted and increased according to a set function until the duty ratio is adjusted to be 100%.

2. The load switching circuit according to claim 1, wherein,

the output switch circuit comprises a switch sub-circuit and an energy absorption sub-circuit, wherein the switch sub-circuit is coupled with the power input end, the power output end and the energy absorption sub-circuit, and receives the first voltage source transmitted by the power input end, the control signal transmitted by the regulating circuit and the first feedback signal transmitted by the power output end, so as to transmit the first voltage source exceeding a second set threshold and/or part of the first feedback signal to the energy absorption sub-circuit, regulate the first voltage source in response to the control signal and provide the regulated first voltage source to the power output end.

3. The load switching circuit according to claim 2, wherein,

the output switch circuit further comprises a protection sub-circuit coupled between the switch sub-circuit and the regulating circuit to receive a portion of the control signal sent by the switch sub-circuit exceeding a third set threshold.

4. The load switching circuit according to claim 3, wherein,

The energy absorption sub-circuit comprises a first transient diode, a second transient diode, a third transient diode, a first resistor, a first capacitor and a second capacitor, and the protection sub-circuit comprises a second resistor, a protection diode and a third capacitor;

wherein a first end of the first switching tube is coupled to a first end of the second switching tube, a first end of the third switching tube, a first end of the first transient diode, a first end of the second transient diode, a first end of the first capacitor, a first end of the second resistor, a first end of the protection diode, a first end of the third capacitor, and the power input end; the second end of the first switching tube is coupled with the second end of the second switching tube, the second end of the third switching tube, the second end of the first transient diode, the first end of the third transient diode and the power supply output end; the third end of the first switching tube is coupled with the third end of the second switching tube, the third end of the third switching tube, the second end of the second resistor, the second end of the protection diode, the second end of the third capacitor and the regulating circuit; the second end of the second transient diode is coupled to the first end of the first resistor, the second end of the first resistor is coupled to the second end of the second capacitor and the second end of the third transient diode, and the second end of the first capacitor is coupled to the first end of the second capacitor.

5. The load switching circuit according to claim 1, wherein,

the power input end comprises a first power input end and a second power input end, the first power input end and the second power input end are respectively used for being coupled with a first end and a second end of the first voltage source, the power output end comprises a first power output end and a second power output end, the first power output end and the second power output end are respectively used for being coupled with a first end and a second end of the load circuit, and the output switch circuit is coupled between the second power input end and the second power output end;

the load switch circuit further comprises a port decoupling circuit coupled between the output switch circuit and the second power supply output end to receive a second feedback signal sent by the second power supply output end and limit the second feedback signal within a fourth set threshold.

6. The load switching circuit according to claim 5, wherein,

the load switch circuit further comprises a freewheel circuit coupled between the first power supply output and the port decoupling circuit;

The follow current circuit is matched with the port decoupling circuit to receive the negative feedback signal when the load circuit inputs the negative feedback signal to the first power supply output end; or when the port decoupling circuit performs energy storage discharge, receiving the energy storage discharge current of the port decoupling circuit.

7. The load switching circuit according to claim 6, wherein,

the freewheel circuit comprises at least two freewheel diodes connected in parallel, a first end of each freewheel diode is coupled between the output switch circuit and the port decoupling circuit, and a second end of each freewheel diode is coupled with the first power supply output end.

8. The load switching circuit according to claim 7, wherein,

9. The load switching circuit according to claim 1, wherein,

The regulating circuit comprises a current sampling sub-circuit and a control sub-circuit, wherein the current sampling sub-circuit is coupled between the power input end and the output switch circuit and is coupled with the control sub-circuit so as to sample and obtain a current input signal on the power input end, and the current input signal is regulated to be a first voltage sampling signal and sent to the control sub-circuit, so that the control sub-circuit responds to the first voltage sampling signal to be a set level signal and sends a third control signal to the output switch circuit so as to control the output switch circuit to disconnect the connection between the power input end and the power output end.

10. The load switching circuit according to claim 9, wherein,

the current sampling sub-circuit comprises a current pickup unit, a differential amplifying unit and a first comparing unit, wherein the current pickup unit is coupled between the power input end and the output switch circuit and is coupled with the differential amplifying unit, the differential amplifying unit is coupled with the first comparing unit and the first end of the control sub-circuit, and the first comparing unit is coupled with an external second voltage source and the second end of the control sub-circuit;

The current pickup unit samples a current input signal on the power input end, adjusts the current input signal into a first voltage signal and sends the first voltage signal to the differential amplification unit, so that the differential amplification unit adjusts the first voltage signal into a second voltage signal and sends the second voltage signal to the first end of the control sub-circuit and the first comparison unit, and the first comparison unit compares the second voltage signal with the second voltage source to obtain a first voltage sampling signal and sends the first voltage sampling signal to the second end of the control sub-circuit.

11. The load switching circuit according to claim 10, wherein,

the regulating circuit further comprises a voltage comparison sub-circuit, wherein the voltage comparison sub-circuit is coupled with the power output end, the first comparison unit, the control sub-circuit and an external third voltage source and a fourth voltage source to sample and obtain a voltage output signal on the power output end, and receives the first voltage sampling signal sent by the first comparison unit, so that the voltage output signal is respectively compared with the third voltage source and the fourth voltage source to obtain a third voltage signal and a fourth voltage signal, and the third voltage signal and the fourth voltage signal are subjected to first logic operation to obtain a second voltage sampling signal, so that the second voltage sampling signal is sent to a third end of the control sub-circuit, and is subjected to second logic operation with the first voltage sampling signal, so that the control sub-circuit responds to the first voltage sampling signal and/or the second voltage sampling signal to be the set level signal, and sends the third control signal to the output switch circuit.

12. The load switching circuit according to claim 11, wherein,

the voltage comparison sub-circuit comprises a second comparison unit, a third comparison unit, a first logic unit, a second logic unit and a third logic unit, wherein the second comparison unit is coupled with the power output end, the third voltage source and the first logic unit, the third comparison unit is coupled with the second comparison unit, the fourth voltage source and the second logic unit, the first logic unit is coupled with the second logic unit, the third logic unit and the third end of the control sub-circuit, and the third logic unit is coupled with the first comparison unit;

the second comparing unit samples the voltage output signal at the power output end to compare the voltage output signal with the third voltage source to obtain a third voltage signal, and the third comparing unit receives the voltage output signal sent by the second comparing unit to compare the voltage output signal with the fourth voltage source to obtain a fourth voltage signal; the first logic unit receives the third voltage signal sent by the second comparing unit, the second logic unit receives the fourth voltage signal sent by the third comparing unit, so that the first logic unit and the second logic unit perform the first logic operation on the third voltage signal and the fourth voltage signal to obtain the second voltage sampling signal, and the second voltage sampling signal is sent to a third end of the control sub-circuit; the third logic unit receives the second voltage sampling signal sent by the second logic unit and the first voltage sampling signal sent by the first comparison unit, so as to perform a second logic operation on the first voltage sampling signal and the second voltage sampling signal.

13. The load switching circuit according to claim 9, wherein,

14. A method of power conditioning for use in the load switching circuit of any one of claims 1 to 13, the method comprising:

sampling to obtain a voltage output signal which is output to an external load circuit;

the voltage output signal is adjusted in response to a frequency change of the voltage output signal such that the voltage output signal does not exceed a first set threshold.

15. A power conditioning device comprising a power circuit and a load switching circuit coupled together;

wherein the load switching circuit is a load switching circuit according to any one of claims 1-13.