CN217769867U - Power supply circuit for restraining surge current and operation equipment - Google Patents
Power supply circuit for restraining surge current and operation equipment Download PDFInfo
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Abstract
The application provides a power supply circuit and operation equipment of suppression surge current includes: the power supply, the load incoming end and the switch module are connected in series. The control end of the switch module is used for accessing a first current regulation and control signal when the load access end accesses the load, the first current regulation and control signal is used for driving the switch module to be switched into a conducting state, and the power supply current of a power supply loop formed by the power supply, the load and the switch module is regulated to be smaller than or equal to a preset current threshold value. Through first current regulation and control signal, drive switch module switches into the conducting state, makes power supply loop switch on, and power supply begins to supply power for the load, prescribes a limit to the electric current size in the power supply loop simultaneously for supply current is less than or equal to predetermined current threshold, avoids appearing the surge, thereby protects equipment.
Description
Technical Field
The application relates to the field of circuits, in particular to a power supply circuit for restraining surge current and operation equipment.
Background
The latter load or output circuit of the power supply often has multiple capacitors connected in parallel, with a discharge capacitor in the power supply providing a low impedance when the battery is turned on, allowing a large current (i.e., surge current) to flow into the circuit as the capacitor charges from zero to a maximum. The inrush current may be up to 20 times the steady state current. Even if the inrush current lasts only about 10 milliseconds, 30 to 40 cycles are required to stabilize the current to a normal operating value. If the inrush current is not limited, it can damage equipment and cause other equipment powered by the same power source to fail, in addition to causing a voltage dip on the power line.
Therefore, how to achieve surge current suppression becomes a problem that those skilled in the art pay attention to.
SUMMERY OF THE UTILITY MODEL
An object of the present application is to provide a power supply circuit and an operating device that suppress an inrush current, so as to at least partially improve the above problems.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
in a first aspect, an embodiment of the present application provides a power supply circuit for suppressing an inrush current, where the power supply circuit includes: the power supply, the load access end and the switch module are connected in series;
the control end of the switch module is used for accessing a first current regulation and control signal when the load access end is accessed to a load, the first current regulation and control signal is used for driving the switch module to be switched into a conducting state, and the power supply current of a power supply loop formed by the power supply, the load and the switch module is regulated to be less than or equal to a preset current threshold value.
Optionally, the switch module includes at least one first switch tube, and when the number of the first switch tubes is greater than 1, all the first switch tubes are connected in parallel, wherein first poles of all the first switch tubes are connected to each other to form a first end of the switch module, second poles of all the first switch tubes are connected to each other to form a second end of the switch module, and third poles of all the first switch tubes are connected to each other to form a control end of the switch module;
when the number of the first switching tubes is equal to 1, a first pole of the first switching tube is used as a first end of the switching module, a second pole of the first switching tube is used as a second end of the switching module, and a third pole of the first switching tube is used as a control end of the switching module.
Optionally, the positive electrode of the power supply is connected to one end of the load access end, the other end of the load access end is connected to the first end of the switch module, and the second end of the switch module is grounded;
the first switch tube is an NPN triode, the first pole of the first switch tube is a collector, the second pole of the first switch tube is an emitter, and the third pole of the first switch tube is a base;
the first current regulation and control signal is used for regulating and controlling the base current of the first switching tube.
Optionally, a positive electrode of the power supply is connected to a first end of the switch module, a second end of the switch module is connected to one end of the load access end, and the other end of the load access end is grounded;
the first switch tube is a PNP triode, a first pole of the first switch tube is an emitting pole, a second pole of the first switch tube is a collector, and a third pole of the first switch tube is a base pole;
the first current regulation and control signal is used for regulating and controlling the base current of the first switching tube.
Optionally, the positive electrode of the power supply is connected to the first end of the switch module, the second end of the switch module is connected to one end of the load access end, and the other end of the load access end is grounded; the first switch tube is a PMOS tube, a first electrode of the first switch tube is a source electrode, a second electrode of the first switch tube is a drain electrode, and a third electrode of the first switch tube is a grid electrode;
the first current regulation and control signal is used for regulating and controlling the voltage difference between the grid electrode and the source electrode of the first switch tube.
Optionally, the switch module further includes a second switch tube, and the second switch tube is connected in parallel with the first switch tube;
the control end of the second switch tube is used for accessing a state switching signal, and the state switching signal is used for driving the second switch tube to be conducted when the equivalent potential of the load is greater than or equal to a preset potential threshold value;
the control end of the first switch tube is also used for accessing a second current regulation and control signal, and the second current regulation and control signal is used for driving the first switch tube to be switched into a cut-off state when the second switch tube is switched on;
the maximum current allowed by the second switch tube is larger than the maximum current allowed by the first switch tube.
Optionally, the power supply circuit further includes a first controller and a second controller, a signal control end of the first controller is connected to a control end of the first switching tube, a signal control end of the second controller is connected to a control end of the second switching tube, the second controller has a detection end for detecting an equivalent potential of the load, and the first controller is in communication connection with the second controller;
the second controller outputs a state switching signal for controlling the second switching tube to be switched on or switched off through a signal control end;
the second controller is also used for transmitting the current state of the second switching tube to the first controller;
the first controller outputs the first current regulation signal or the second current regulation signal for controlling the on or off of the first switching tube through a signal control end.
Optionally, the power supply circuit further includes a third controller, where the third controller has a detection end for detecting an equivalent potential of the load, a first signal control end for accessing the control end of the first switching tube, and a second signal control end for accessing the control end of the second switching tube;
the third controller outputs a state switching signal for controlling the second switching tube to be switched on or switched off through the second signal control end;
the third controller outputs the first current regulation signal or the second current regulation signal for controlling the on/off of the first switching tube through the second signal control end.
Optionally, the power supply circuit further includes a third switching tube, and the third switching tube, the power supply, the load, and the switching module are connected in series to form a power supply loop.
In a second aspect, an embodiment of the present application provides a work apparatus including the power supply circuit described above.
Compared with the prior art, the power supply circuit and the operation equipment for restraining the surge current provided by the embodiment of the application comprise: the power supply, the load incoming end and the switch module are connected in series. The control end of the switch module is used for accessing a first current regulation and control signal when the load access end accesses the load, the first current regulation and control signal is used for driving the switch module to be switched into a conducting state, and the power supply current of a power supply loop formed by the power supply, the load and the switch module is regulated to be smaller than or equal to a preset current threshold value. Through first current regulation and control signal, drive switch module switches into the conducting state, makes power supply loop switch on, and power supply begins to supply power for the load, prescribes a limit to the electric current size in the power supply loop simultaneously for supply current is less than or equal to predetermined current threshold, avoids appearing the surge, thereby protects equipment.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic connection diagram of a switch module corresponding to fig. 1 according to an embodiment of the present disclosure;
fig. 4 is a schematic connection diagram of a switch module corresponding to fig. 2 according to an embodiment of the present disclosure;
fig. 5 is a schematic connection diagram of a switch module corresponding to fig. 1 according to an embodiment of the present disclosure;
fig. 6 is a schematic connection diagram of a switch module corresponding to fig. 2 according to an embodiment of the present disclosure;
FIG. 7 is a graph showing the voltage rise of the equivalent capacitance of the load according to the embodiment of the present application;
fig. 8 is a schematic diagram illustrating an amplification relationship of a transistor according to an embodiment of the present disclosure;
fig. 9 is a schematic connection diagram of a switch module corresponding to fig. 1 according to an embodiment of the present disclosure;
fig. 10 is a schematic connection diagram of a switch module corresponding to fig. 2 according to an embodiment of the present disclosure;
fig. 11 is a schematic connection diagram of a switch module corresponding to fig. 1 according to an embodiment of the present disclosure;
fig. 12 is a schematic connection diagram of a switch module corresponding to fig. 2 according to an embodiment of the present disclosure;
fig. 13 is a schematic connection diagram of a power supply circuit according to an embodiment of the present disclosure.
In the figure: 10-a power supply; 20-a switch module; 30-load.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
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. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; 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 application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
In one possible implementation, the inrush current may be suppressed by an NTC (thermistor) or cement resistor. However, under the condition that the secondary capacitor is large and the voltage is high (the surge current is large), the NTC can bear too small power, and the NTC fails due to over-power, so that the NTC is not suitable for the working condition; under the high-power working condition, the cement resistor is suitable, but the cement resistor is heavy, and is not suitable for use under the situation with high requirement on the weight.
In order to be able to be great in the latter stage electric capacity, under the great condition of inrush current, simplify the circuit, the scene demand is pressed close to better in the aspect of performance and weight, this application embodiment provides a power supply circuit who restraines inrush current, be applied to operation equipment, operation equipment can be movable platform terminal equipment or fixed station terminal equipment, movable platform terminal equipment can be unmanned aerial vehicle or other survey equipment, fixed station terminal equipment can be unmanned aerial vehicle stop station or fill electric pile.
Referring to fig. 1 and fig. 2, fig. 1 is one of connection schematic diagrams of a power supply circuit provided in an embodiment of the present application, and fig. 2 is one of connection schematic diagrams of the power supply circuit provided in the embodiment of the present application. As shown in fig. 1 and 2, the power supply circuit includes: the power supply system comprises a power supply 10, a load access end for accessing a load 30 and a switch module 20, wherein the power supply 10, the load access end and the switch module 20 are connected in series.
It should be understood that after the power supply circuit is connected to the load 30 through the load connection terminal, a power supply loop formed by the series connection may be, as shown in fig. 1, a power supply 10 → the load 30 → the switch module 20 → a ground, or may be, as shown in fig. 2, the power supply 10 → the switch module 20 → the load 30 → the ground, which is not limited herein.
The control end of the switch module 20 is configured to access a first current regulation signal, and the first current regulation signal is configured to drive the switch module 20 to switch to a conducting state, and adjust a supply current of a power supply loop formed by the power supply 10, the load 30, and the switch module 20 to be less than or equal to a preset current threshold.
It should be understood that, by the first current regulation and control signal, the driving switch module 20 is switched to the on state, so that the power supply loop is turned on, the power supply 10 starts to supply power to the load 30, and the current in the power supply loop is limited, so that the power supply current is less than or equal to the preset current threshold, and the occurrence of surge is avoided, thereby protecting the device.
Alternatively, the current threshold may be preset according to the characteristics of the load 30, for example, according to the capacitance of the equivalent capacitance of the load 30.
To sum up, the power supply circuit for suppressing surge current provided by the embodiment of the present application includes: the power supply system comprises a power supply 10, a load access end for accessing a load 30 and a switch module 20, wherein the power supply 10, the load access end and the switch module 20 are connected in series. The control end of the switch module 20 is configured to access a first current regulation signal when the load access end is connected to the load 30, and the first current regulation signal is configured to drive the switch module 20 to switch to a conduction state, and regulate a supply current of a power supply loop formed by the power supply 10, the load 30, and the switch module 20 to be less than or equal to a preset current threshold. Through the first current regulation and control signal, the driving switch module 20 is switched to a conducting state, so that the power supply loop is conducted, the power supply 10 starts to supply power to the load 30, and the current in the power supply loop is limited, so that the power supply current is less than or equal to a preset current threshold, and the occurrence of surge is avoided, thereby protecting the equipment.
On the basis of fig. 1, regarding the structure of the switch module 20, the embodiment of the present application further provides a possible implementation manner, please refer to fig. 3, fig. 5, fig. 4, and fig. 6, where fig. 3 is one of connection schematic diagrams of the switch module corresponding to fig. 1 provided in the embodiment of the present application, fig. 5 is one of connection schematic diagrams of the switch module corresponding to fig. 1 provided in the embodiment of the present application, fig. 4 is one of connection schematic diagrams of the switch module corresponding to fig. 2 provided in the embodiment of the present application, and fig. 6 is one of connection schematic diagrams of the switch module corresponding to fig. 2 provided in the embodiment of the present application.
As shown in fig. 3, 5, 4 and 6, the switch module 20 includes at least one first switch Q1, and when the number of the first switch Q1 is greater than 1, all the first switch Q1 are connected in parallel, wherein first poles of all the first switch Q1 are connected to each other to form a first end of the switch module 20, second poles of all the first switch Q1 are connected to each other to form a second end of the switch module 20, and third poles of all the first switch Q1 are connected to each other to form a control end of the switch module 20.
When the number of the first switching tubes Q1 is equal to 1, a first pole of the first switching tube Q1 serves as a first terminal of the switching module 20, a second pole of the first switching tube Q1 serves as a second terminal of the switching module 20, and a third pole of the first switching tube Q1 serves as a control terminal of the switching module 20.
Specifically, the first end of the switch module 20 may be a point a shown in the figure, the second end of the switch module 20 may be a point b shown in the figure, and the control end of the switch module 20 may be a point c shown in the figure.
It should be understood that after the power supply 10 (corresponding to the battery V1 in the figure) starts to supply power to the load 30, the voltage of the equivalent capacitor C1 of the load 30 rises, and the voltage between the first terminal and the second terminal of the switch module 20 falls, for example, the current remains unchanged, that is, the power of the switch module 20 starts to fall. Possibly, the power of the switch module 20 is at its maximum in the initial stage of the conduction of the supply circuit, and in order to ensure reliable operation of the switch module over a long period of time, a single switch tube with a higher power may be used, for example, the switch module in the initial stage of the conduction of the supply circuitThe power of the block 20 is P 0 The preset current threshold is 1A, the voltage of the power supply 10 is 50V 0 =50V × 1a =50w, and a switching tube with a rated power of P =100W can be selected as the switching module 20, as shown in fig. 5 and 6.
Optionally, a circuit design with a plurality of switching tubes connected in parallel may also be adopted to achieve the purpose of ensuring that the switching module can reliably operate for a long time. As shown in fig. 3 and 4, the plurality of first switching tubes Q1 are connected in parallel to relieve the power stress of the first switching tubes Q1.
Taking the number of the first switch tubes Q1 equal to 4 as an example, when the preset current threshold is 1A, the single current of each first switch tube Q1 is 0.25A, the voltage of the power supply 10 is 50V, and the power of the single first switch tube Q1 at the initial stage of the conduction of the power supply loop is P 1 ，P 1 =0.25a 50v =12.5w relative to P 0 =50V × 1a =50w, so as to reduce the power stress of the first switching tube Q1 and prolong the service life thereof.
The number of the first switching tubes Q1 shown in fig. 3 and 4 is equal to 3, but not limited thereto. In fig. 3, 5, 4 and 6, the first switching tube Q1 is shown as a transistor (NPN transistor or PNP transistor) as an example, but the first switching tube Q1 is not limited thereto, and the first switching tube Q1 may also be a MOS transistor (NMOS or PMOS) or an IGBT transistor.
Referring to fig. 7, fig. 7 is a rising curve of the voltage of the equivalent capacitor of the load 30 according to the embodiment of the present disclosure. It should be understood that the rising curve of the capacitor voltage is inversely followed by the falling curve of the voltage between the first terminal and the second terminal of the switch module 20.
In one possible implementation, as shown in fig. 1, the positive electrode of the power supply 10 is connected to one end of the load 30 (which may be understood as one end of the load incoming end), the other end of the load 30 (which may be understood as the other end of the load incoming end) is connected to the first end (a) of the switch module 20, and the second end (b) of the switch module 20 is grounded.
On the basis of fig. 1, regarding the selection of the first switch Q1, the embodiment of the present application further provides a possible implementation manner, as shown in fig. 3 and fig. 5, the first switch Q1 is an NPN triode, a first electrode of the first switch Q1 is a collector electrode, a second electrode of the first switch Q1 is an emitter electrode, and a third electrode of the first switch Q1 is a base electrode; the first current regulation signal is used for regulating and controlling the base current of the first switching tube Q1.
It should be understood that, depending on the characteristics of the transistor: the base current determines the collector current and the emitter current depending on the amplification factor (β), and thus determines the magnitude of the supply current in the supply loop.
The triode is used as a current limiting device, ic = beta Ib shows that Ic in the loop can be controlled by selecting a proper amplification factor and the corresponding Ib. The surge can be suppressed by controlling the current in the loop to charge the post-stage capacitor.
Referring to fig. 8, fig. 8 is a schematic diagram illustrating an amplification relationship of a transistor according to an embodiment of the present disclosure. When Ic is small, the magnification (h) FE ) Larger, with increasing Ic, the magnification (h) FE ) As well as changes.
On the basis of fig. 1, regarding the selection of the first switch Q1, the embodiment of the present application further provides a possible implementation manner, as shown in fig. 9, the first switch Q1 is an NMOS transistor, a first pole of the first switch Q1 is a drain, a second pole of the first switch Q1 is a source, and a third pole of the first switch Q1 is a gate; the first current regulation signal is used for regulating and controlling the voltage difference between the grid electrode and the source electrode of the first switch tube Q1.
It should be understood that for an NMOS transistor, the larger Vgs (voltage difference between gate and source), the stronger the electric field acting on the semiconductor surface, the more electrons are attracted to the surface of the P substrate, the thicker the conduction channel, the lower the channel resistance, i.e. the lower the equivalent resistance of the MOS transistor.
The first current regulation and control signal loaded by the grid electrode of the NMOS tube is a dynamically-changed voltage signal, vgs can be used for conducting the NMOS tube at the initial stage of conducting the power supply loop, but the equivalent resistance of the NMOS tube is large, so that the current in the power supply loop is limited, vds is gradually reduced along with the voltage rise at two ends of the load 30, vgs needs to be adjusted to be gradually increased at the moment, the equivalent resistance of the NMOS tube is gradually reduced, the power consumption is reduced, and the charging current is not too small.
It should be noted that, in fig. 9, the switch module 20 includes one NMOS transistor as an example, but not limited to this, the switch module 20 may include N NMOS transistors, where N is greater than or equal to 1, and specifically, reference may be made to fig. 3.
Referring to fig. 3, fig. 5 and fig. 9, in a possible implementation manner, the switch module 20 further includes a first resistor R1 and a second resistor R2, the first resistor R1 is disposed at the control end of the switch module 20, one end of the second resistor R2 is connected between the first resistor R1 and the third pole of the first switch Q1, and the other end of the second resistor R2 is connected to the second pole of the first switch Q1.
In one possible implementation, as shown in fig. 2, the positive electrode of the power supply 10 is connected to a first end of the switch module 20, a second end of the switch module 20 is connected to one end of the load 30 (which may be understood as one end of the load access terminal), and the other end of the load 30 (which may be understood as the other end of the load access terminal) is grounded.
On the basis of fig. 2, regarding the selection of the first switch Q1, the embodiment of the present application further provides a possible implementation manner, as shown in fig. 4 and fig. 6, the first switch Q1 is a PNP triode, a first electrode of the first switch Q1 is an emitter, a second electrode of the first switch Q1 is a collector, and a third electrode of the first switch Q1 is a base;
the first current regulation signal is used for regulating and controlling the base current of the first switching tube Q1.
It should be understood that according to the current amplification characteristic of the PNP transistor, the collector current of the PNP transistor is limited after the base current of the PNP transistor is determined, so that the supply current in the power supply loop is limited, and the occurrence of surge current is avoided.
On the basis of fig. 2, regarding the selection of the first switch Q1, the embodiment of the present application further provides a possible implementation manner, as shown in fig. 10, the first switch Q1 is a PMOS transistor, the first pole of the first switch Q1 is a source electrode, the second pole of the first switch Q1 is a drain electrode, and the third pole of the first switch Q1 is a gate electrode.
The first current regulation signal is used for regulating and controlling the voltage difference between the grid electrode and the source electrode of the first switch tube Q1.
It should be understood that the more negative Vgs (larger absolute value) of the PMOS transistor, the smaller the on-resistance of the channel, i.e. the smaller the equivalent resistance, the larger the value of the current. Therefore, in the power supply process, the equivalent resistance of the PMOS tube can be flexibly controlled through the first current regulation and control signal, so that the current in the power supply loop can be limited.
Specifically, when the voltage difference between the grid electrode and the source electrode of the PMOS tube changes, the equivalent resistance of the PMOS tube changes, so that a large resistance and a small current are kept at the initial stage of conduction, and subsequently, the absolute value of Vgs is gradually increased along with the charging of a load, the resistance is gradually reduced, the current is kept stable, and surge current cannot occur.
It should be noted that, in fig. 10, the switch module 20 is shown to include one PMOS transistor as an example, but the switch module 20 is not limited to this, and the switch module 20 may include N PMOS transistors, where N is greater than or equal to 1, and refer to fig. 4 specifically.
In order to meet the requirement of a large current application, the embodiment of the present application further provides a possible implementation manner, please refer to fig. 11 and 12, the switch module 20 further includes a second switch tube Q2, and the second switch tube Q2 is connected in parallel with the first switch tube Q1. Optionally, a first pole of the second switch Q2 is connected to the first pole of the first switch Q1, a second pole of the second switch Q2 is connected to the second pole of the first switch Q1, and a control end of the second switch Q2 is configured to access the state switching signal. The state switching signal is used for driving the second switch tube Q2 to be turned on when the equivalent potential of the load 30 is greater than or equal to a preset potential threshold.
The control end of the first switch tube Q1 is also used for accessing a second current regulation signal, and the second current regulation signal is used for driving the first switch tube Q1 to be switched to a cut-off state when the second switch tube Q2 is switched on.
The maximum current allowed by the second switch tube Q2 is greater than the maximum current allowed by the first switch tube Q1. The phrase may also be understood that, when there are a plurality of first switching tubes Q1, the maximum current allowed by the second switching tube Q2 is greater than the sum of the maximum currents allowed by all the first switching tubes Q1.
It should be understood that when the first switch Q1 is a triode, the second switch Q2 may be a MOS transistor, for example, if the first switch Q1 is an NPN triode, the second switch Q2 is an NMOS transistor; if the first switch tube Q1 is a PNP triode, the second switch tube Q2 is a PMOS tube.
Specifically, in the initial stage of power supply, the equivalent potential of the load 30 (the voltage value of the equivalent capacitor C1 of the load 30) is 0, in order to avoid the occurrence of inrush current, power may be supplied through the first switch tube Q1 first, the magnitude of the power supply current is limited, after the equivalent capacitor C1 reaches a certain charging proportion, for example, when saturated or half-saturated, the second switch tube Q2 may be switched on, and after the second switch tube Q2 is switched on, the second current regulation signal may be input to the control end of the first switch tube Q1, so that the first switch tube Q1 is switched to the cut-off state, thereby the magnitude of the power supply current in the power supply loop may be increased, and on the premise that the inrush current can be suppressed, the large current requirement may also be satisfied.
In some embodiments, the signals received by the control terminal of the first switching tube Q1 and the control terminal of the second switching tube Q2 may be provided by different controllers, for example, the control terminal of the first switching tube Q1 is connected to the signal control terminal of the first controller, so that the first controller may output a first current regulation signal or a second current regulation signal for controlling the conduction or the interruption of the first switching tube through the signal control terminal; similarly, the control end of the second switch tube Q2 is connected to the signal control end of the second controller, so that the second controller can output a state switching signal for controlling the on or off of the second switch tube Q2 through the signal control end. The second controller may have a detection end for detecting the equivalent potential of the load 30, so that the second controller may control the second switching tube Q2 to be turned on or off through the equivalent potential detected by the detection end; the first controller can be in communication connection with the second controller, so that the first controller can know the current state of the second switching tube Q2 through the second controller, and can determine whether the second switching tube Q2 is in a conducting state or a cut-off state, and further control the first switching tube Q1 to be conducted or cut off.
Of course, in other embodiments, the signals received by the control terminal of the first switch tube Q1 and the control terminal of the second switch tube Q2 may also be provided by the same third controller, and the third controller has a detection terminal for detecting the equivalent potential of the load 30, a first signal control terminal for receiving the control terminal of the first switch tube Q1, and a second signal control terminal for receiving the control terminal of the second switch tube Q2.
Based on this, the control end of the first switch tube Q1 and the control end of the second switch tube Q2 are respectively connected with the two signal control ends of the third controller.
Therefore, the third controller can control the second switching tube Q2 to be turned on or off through the equivalent potential detected by the detection end, for example, when the detected equivalent potential is greater than or equal to a preset potential threshold, a state switching signal is input to the control end of the second switching tube Q2 to turn on the second switching tube Q2, and then a second current regulation and control signal is input to the control end of the first switching tube Q1 to turn off the first switching tube Q1.
The detection method of the equivalent potential and the signal providing method of the control terminals of the first switch tube Q1 and the second switch tube Q2 are not limited to the above embodiments.
Referring to fig. 13, in order to reduce the possibility of the power supply loop being turned on by mistake, the embodiment of the present application further provides a possible implementation manner, as shown in fig. 13, the power supply circuit further includes a third switching tube Q3, and the third switching tube Q3, the power supply 10, the load 30, and the switch module 20 are connected in series to form the power supply loop.
Optionally, the third switching tube Q3 may be disposed between the power supply 10 and the switching module 20, and the circuit is protected by disposing the third switching tube Q2, so as to prevent the switching module 20 from being triggered by mistake, which results in the conduction of the power supply loop.
In a possible implementation, a current limiting resistor R3 may also be provided between the power supply 10 and the load 30.
It should be noted that the power supply 10 in the embodiment of the present application is not limited to a battery, and may be a dc power supply module. The load 30 is not limited to a specific actuator, such as a motor, but may be a battery to be charged.
The embodiment of the application also provides the working equipment, and the working equipment comprises the power supply circuit.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A power supply circuit that suppresses an inrush current, the power supply circuit comprising: the power supply, the load access end and the switch module are connected in series;
the control end of the switch module is used for accessing a first current regulation and control signal when the load access end accesses a load, the first current regulation and control signal is used for driving the switch module to be switched into a conducting state, and the power supply current of a power supply loop formed by the power supply, the load and the switch module is regulated to be smaller than or equal to a preset current threshold value.
2. The inrush current suppression power supply circuit of claim 1, wherein the switching module comprises at least one first switching tube, and when the number of the first switching tubes is greater than 1, all the first switching tubes are connected in parallel, wherein first poles of all the first switching tubes are connected to each other to form a first end of the switching module, second poles of all the first switching tubes are connected to each other to form a second end of the switching module, and third poles of all the first switching tubes are connected to each other to form a control end of the switching module;
when the number of the first switching tubes is equal to 1, a first pole of the first switching tube is used as a first end of the switching module, a second pole of the first switching tube is used as a second end of the switching module, and a third pole of the first switching tube is used as a control end of the switching module.
3. The inrush current suppressing power supply circuit according to claim 2, wherein a positive electrode of the power supply is connected to one end of the load connection terminal, the other end of the load connection terminal is connected to a first end of the switch module, and a second end of the switch module is grounded;
the first switch tube is an NPN triode, a first electrode of the first switch tube is a collector electrode, a second electrode of the first switch tube is an emitter electrode, and a third electrode of the first switch tube is a base electrode;
the first current regulation and control signal is used for regulating and controlling the base current of the first switching tube.
4. The inrush current suppression power supply circuit of claim 2, wherein a positive terminal of the power supply is connected to a first terminal of the switch module, a second terminal of the switch module is connected to one terminal of the load access terminal, and the other terminal of the load access terminal is grounded;
the first switch tube is a PNP triode, a first pole of the first switch tube is an emitting pole, a second pole of the first switch tube is a collector, and a third pole of the first switch tube is a base pole;
the first current regulation and control signal is used for regulating and controlling the base current of the first switching tube.
5. The inrush current suppression power supply circuit according to claim 2, wherein a positive electrode of the power supply is connected to a first end of the switch module, a second end of the switch module is connected to one end of the load connection terminal, and the other end of the load connection terminal is grounded; the first switch tube is a PMOS tube, a first electrode of the first switch tube is a source electrode, a second electrode of the first switch tube is a drain electrode, and a third electrode of the first switch tube is a grid electrode;
the first current regulation and control signal is used for regulating and controlling the voltage difference between the grid electrode and the source electrode of the first switch tube.
6. The inrush current suppression power supply circuit of claim 2, wherein the switching module further comprises a second switching tube connected in parallel with the first switching tube;
the control end of the second switch tube is used for accessing a state switching signal, and the state switching signal is used for driving the second switch tube to be conducted when the equivalent potential of the load is greater than or equal to a preset potential threshold value;
the control end of the first switch tube is also used for accessing a second current regulation and control signal, and the second current regulation and control signal is used for driving the first switch tube to be switched into a cut-off state when the second switch tube is switched on;
the maximum current allowed by the second switch tube is larger than the maximum current allowed by the first switch tube.
7. The inrush current suppression power supply circuit according to claim 6, further comprising a first controller and a second controller, wherein a signal control terminal of the first controller is connected to the control terminal of the first switching tube, a signal control terminal of the second controller is connected to the control terminal of the second switching tube, the second controller has a detection terminal for detecting an equivalent potential of the load, and the first controller is communicatively connected to the second controller;
the second controller outputs a state switching signal for controlling the second switching tube to be switched on or switched off through a signal control end;
the second controller is also used for transmitting the current state of the second switching tube to the first controller;
the first controller outputs the first current regulation signal or the second current regulation signal for controlling the on or off of the first switching tube through a signal control end.
8. The inrush current suppression power supply circuit of claim 6, further comprising a third controller having a detection terminal for detecting an equivalent potential of the load, a first signal control terminal for connecting to the control terminal of the first switching tube, and a second signal control terminal for connecting to the control terminal of the second switching tube;
the third controller outputs a state switching signal for controlling the second switching tube to be switched on or switched off through the second signal control end;
the third controller outputs the first current regulation signal or the second current regulation signal for controlling the conduction or the cut-off of the first switching tube through the second signal control end.
9. The inrush current suppressing power supply circuit as claimed in claim 6, wherein the power supply circuit further comprises a third switching tube, and the third switching tube, the power supply source, the load and the switching module are connected in series to form a power supply loop.
10. A working device characterized by comprising the power supply circuit of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221574235.8U CN217769867U (en) | 2022-06-21 | 2022-06-21 | Power supply circuit for restraining surge current and operation equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221574235.8U CN217769867U (en) | 2022-06-21 | 2022-06-21 | Power supply circuit for restraining surge current and operation equipment |
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| CN217769867U true CN217769867U (en) | 2022-11-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117728544A (en) * | 2024-02-07 | 2024-03-19 | 液流储能科技有限公司 | Direct current converging circuit and method for liquid flow energy storage new energy battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117728544A (en) * | 2024-02-07 | 2024-03-19 | 液流储能科技有限公司 | Direct current converging circuit and method for liquid flow energy storage new energy battery |
| CN117728544B (en) * | 2024-02-07 | 2024-05-14 | 液流储能科技有限公司 | Direct current converging circuit and method for liquid flow energy storage new energy battery |
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