CN216699817U - Power supply protection circuit and power supply equipment - Google Patents
Power supply protection circuit and power supply equipment Download PDFInfo
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- CN216699817U CN216699817U CN202120547792.XU CN202120547792U CN216699817U CN 216699817 U CN216699817 U CN 216699817U CN 202120547792 U CN202120547792 U CN 202120547792U CN 216699817 U CN216699817 U CN 216699817U
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- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
Abstract
The embodiment of the application discloses a power supply protection circuit and power supply equipment, when a power supply end of the power supply protection circuit is switched on, a switch module disconnects the power supply end and a direct charging loop of a protection capacitor, a voltage reduction module reduces voltage input to a slow charging module to a preset first charging voltage, controllable charging of the protection capacitor of the power supply protection circuit can be realized when the power supply is switched on, the charging current of the protection capacitor is controllable, and the service life of the protection capacitor is not influenced by large impact current; when the protection capacitor is frequently turned on and off, the voltage reduction module and the buffer module can be used for slowly charging the protection capacitor, so that the loss of the protection capacitor is low, the heating is low, and the fault is not easily caused.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a power supply protection circuit and power supply equipment.
Background
In order to prevent the impact of instantaneous large current, a switch is connected in series in an input loop, and a power resistor with a large volume is connected in parallel to the switch. The design can not provide protection when the input overvoltage exceeds the rated voltage of the input capacitor, and the input capacitor is easy to damage; when the power is turned on and off frequently or the power fails, the resistor connected in parallel with the switch is easy to generate heat and damage.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present application proposes a power protection circuit and a power supply apparatus.
The application provides a power supply protection circuit, which comprises a control module, a switch module, a voltage reduction module, a slow charging module, an auxiliary power supply module, a protection capacitor and a power supply end;
the first control end of the control module is connected with the control end of the switch module, the second control end of the control module is connected with the voltage reduction module, and the power supply end of the control module is connected with the power supply end of the auxiliary power supply module;
the control end of the slow charging module is connected with the control end of the voltage reducing module;
the first end of the slow charging module is connected with the anode of the power supply end, the first end of the switch module and the first sampling end of the control module, the second end of the switch module is respectively connected with the anode of the protection capacitor, the first sampling end of the auxiliary power supply module, the second sampling end of the control module and the second end of the slow charging module, and the cathode of the protection capacitor is respectively connected with the cathode of the power supply end, the second sampling end of the auxiliary power supply module, the anti-reverse end of the slow charging module and the ground; or the first end of the slow charging module is connected with the negative electrode of the power supply end, the first end of the switch module, the grounding end of the control module, the first sampling end of the auxiliary power supply module and the ground, the second end of the switch module is respectively connected with the negative electrode of the protection capacitor, the second sampling end of the control module and the second end of the slow charging module, and the positive electrode of the protection capacitor is respectively connected with the positive electrode of the power supply end, the second sampling end of the auxiliary power supply module, the anti-reverse end of the slow charging module and the first sampling end of the control module;
when the power supply end of the power supply protection circuit is switched on, the switch module cuts off the power supply end and a direct charging loop of the protection capacitor, and the voltage reduction module reduces the voltage input to the slow charging module to a preset first charging voltage;
and when the protection voltage at the two ends of the protection capacitor reaches a preset voltage threshold, the auxiliary power supply module converts the protection voltage into the working voltage of the control module.
The power protection circuit of the present application, the control module is configured to:
monitoring the difference value of the input voltage of the power supply end and the protection voltage at two ends of the protection capacitor;
when the difference value is larger than a preset first voltage difference value, the second control end outputs a first voltage reduction instruction to control the voltage reduction module to reduce the voltage input to the slow charging module to a preset second charging voltage;
when the difference value is smaller than a preset first voltage difference value, the first control end outputs a closing instruction to control the switch module to switch on the power supply end and a direct charging loop of the protection capacitor, and the second control end outputs a stopping instruction to control the voltage reduction module to stop working;
when the input voltage is greater than the rated voltage of the protection capacitor, the first control end outputs a first disconnection instruction to control the switch module to disconnect the power supply end and a direct charging loop and a rear-stage circuit of the protection capacitor, the second control end outputs a first voltage reduction instruction to control the voltage reduction module to reduce the voltage input to the slow charging module to a preset second charging voltage, so that the protection voltage at two ends of the capacitor is reduced to be lower than the rated voltage, and the rear-stage circuit is connected with the capacitor in parallel.
According to the power supply protection circuit, the buffer module comprises a switch tube, an anti-reverse unit, a follow current unit and a buffer unit;
the control end of slow filling module is connected the control end of step-down module includes: the control end of the switch tube is connected with the control end of the voltage reduction module;
the first end of slow charging module is connected the positive pole of power supply end the first end of switch module with control module's first sample end, switch module's second end is connected respectively protection electric capacity's positive pole the first sample end of supplementary power supply module the second sample end of control module with slow charging module's second end, protection electric capacity's negative pole is connected respectively the negative pole of power supply end the second sample end of supplementary power supply module the anti-back end of slow charging module and ground include:
the control end of the switch tube is connected with the voltage reduction module, the first end of the switch tube is connected with the anode of the power supply end, and the second end of the switch tube is connected with the input end of the reverse prevention unit;
the output end of the anti-reverse unit is respectively connected with the output end of the follow current unit and one end of the slow charging unit;
the other end of the slow charging unit is connected with the anode of the protection capacitor;
and the input end of the follow current unit is connected with the negative electrode of the power supply end.
The application power protection circuit, the switch tube includes one of NMOS pipe, relay and triode.
The power protection circuit, prevent that the unit includes at least one first diode, the positive pole of first diode is as prevent the input of the unit, the negative pole of first diode is as prevent the output of the unit of preventing.
The power protection circuit of this application, the freewheel unit includes at least one second diode, the positive pole of second diode is as the input of freewheel unit, the negative pole of second diode is as the output of freewheel unit.
The application discloses power protection circuit, the slow charging unit includes the inductance.
According to the power supply protection circuit, the buffer module comprises a switch tube, an anti-reverse unit, a follow current unit and a buffer unit;
the control end of slow filling module is connected the control end of step-down module includes: the control end of the switch tube is connected with the control end of the voltage reduction module;
the first end of slow charging module is connected the negative pole of power supply end the first end of switch module the earthing terminal of control module the first sample terminal of supplementary power module and ground, switch module's second end is connected respectively protection electric capacity's negative pole the second sample terminal of control module with slow charging module's second end, protection electric capacity's positive pole is connected respectively the positive pole of power supply end, supplementary power module's second sample terminal the anti-reverse end of slow charging module with control module's first sample terminal includes:
the first end of the switch tube is connected with the output end of the anti-reverse unit, and the second end of the switch tube is connected with the negative electrode of the power supply end;
the input end of the anti-reverse unit is respectively connected with the input end of the follow current unit and one end of the slow charging unit;
the other end of the slow charging unit is connected with the negative electrode of the protection capacitor;
and the output end of the follow current unit is connected with the anode of the power supply end.
When the switch tube comprises an NMOS tube, the reverse blocking prevention unit comprises a first diode, the freewheeling unit comprises a second diode, and the slow charging unit comprises an inductor:
the grid electrode of the NMOS tube is connected with the voltage reduction module, the drain electrode of the NMOS tube is connected with the cathode of the first diode, and the source electrode of the NMOS tube is connected with the cathode of the power supply end;
the anode of the first diode is respectively connected with the anode of the second diode and one end of the inductor;
the other end of the inductor is connected with the negative electrode of the protection capacitor;
and the cathode of the second diode is connected with the anode of the power supply end.
The application provides a power supply device, the power supply device comprises the power supply protection circuit.
According to the power supply protection circuit, when the power supply end of the power supply protection circuit is switched on, the switch module disconnects the power supply end and the direct charging loop of the protection capacitor, the voltage input into the slow charging module is reduced to the preset first charging voltage by the voltage reduction module, the protection capacitor of the power supply protection circuit can be controllably charged when the power supply is switched on, the charging current of the protection capacitor is controllable, and the service life of the protection capacitor cannot be influenced by large impact current; when the machine is frequently turned on and off, the voltage reduction module and the slow charging module can be used for slowly charging the protection capacitor, so that the loss of the protection capacitor is low, the heating is low, and the fault is not easily caused.
Drawings
In order to more clearly explain the technical solutions of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and 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 of protection of the present application. Like components are numbered similarly in the various figures.
Fig. 1 shows a schematic structural diagram of a power protection circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another power protection circuit proposed in the embodiment of the present application;
fig. 3 is a schematic structural diagram illustrating a buffer module in a power protection circuit according to an embodiment of the present disclosure;
fig. 4 shows a schematic circuit diagram of a power protection circuit according to an embodiment of the present application.
Description of the main element symbols:
10-a control module; 20-a switch module; 30-a voltage reduction module; 40-a buffer module; 50-auxiliary power supply module.
Detailed Description
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 only a part of the embodiments of the present application, and not all of the 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 of the present application without making any creative effort, shall fall within the protection scope of the present application.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present application, are intended to indicate only specific features, numerals, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the presence of or adding to one or more other features, numerals, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present application belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments.
The method and the device can be used for pre-charging the protection capacitor in the power supply protection circuit of the electric equipment when the electric equipment is started, and can also realize overvoltage protection on the protection capacitor, and the protection capacitor is disconnected with the input bus when overvoltage occurs, so that the protection capacitor in the power supply protection circuit and a rear-stage electric load are effectively protected; the power supply protection circuit works in the on-off state of the electric equipment, has low loss, and does not generate heat to damage the power supply of the electric equipment even if the electric equipment is frequently turned on and turned off; the power supply protection circuit has an accurate current limiting circuit, and even if a power supply fails, the power supply cannot be damaged; in addition, the power supply protection circuit does not need a high-power resistor, so that the size is small, and the power density of a power supply is favorably improved.
Example 1
One embodiment of the present application provides a power protection circuit, as shown in fig. 1, including a control module 10, a switch module 20, a voltage reduction module 30, a buffer module 40, an auxiliary power supply module 50, a protection capacitor, and a power supply terminal.
The control module 10, the switch module 20, the voltage reduction module 30, the slow charging module 40, the auxiliary power supply module 50, the protection capacitor and the power supply end of the power protection circuit relate to two connection relations.
Exemplarily, in a first connection relationship as shown in fig. 1, a first control terminal Cc1 of the control module 10 is connected to the control terminal Kc1 of the switch module 20, a second control terminal Cc2 of the control module 10 is connected to the voltage-reducing module 30, and a power supply terminal of the control module 10 is connected to a power supply terminal of the auxiliary power supply module 50; the control end Hc1 of the buffer module 40 is connected with the control end Jc1 of the voltage reduction module 30; the first end H1 of the slow charging module 40 is connected to the positive electrode of the power supply terminal, the first end K1 of the switch module 20 and the first sampling terminal of the control module 10, the second end K2 of the switch module 20 is connected to the positive electrode of the protection capacitor, the first sampling terminal of the auxiliary power supply module 50, the second sampling terminal of the control module 10 and the second end H2 of the slow charging module 40 respectively, and the negative electrode of the protection capacitor is connected to the negative electrode of the power supply terminal, the second sampling terminal of the auxiliary power supply module 50, the anti-reverse terminal Hf of the slow charging module 40 and the ground respectively.
Exemplarily, in the second connection relationship, as shown in fig. 2, the first control terminal Cc1 of the control module 10 is connected to the control terminal Kc1 of the switch module 20, the second control terminal Cc2 of the control module 10 is connected to the voltage-reducing module 30, and the power supply terminal of the control module 10 is connected to the power supply terminal of the auxiliary power supply module 50; the control end Hc1 of the buffer module 40 is connected with the control end Jc1 of the voltage reduction module 30; the first end H1 of the slow charging module 40 is connected to the negative electrode of the power supply terminal, the first end K1 of the switch module 20, the ground terminal of the control module 10, the first sampling terminal of the auxiliary power supply module 50 and the ground, the second end K2 of the switch module 20 is connected to the negative electrode of the protection capacitor, the second sampling terminal of the control module 10 and the second end H2 of the slow charging module 40 respectively, and the positive electrode of the protection capacitor is connected to the positive electrode of the power supply terminal, the second sampling terminal of the auxiliary power supply module 50, the anti-reverse terminal Hf of the slow charging module 40 and the first sampling terminal of the control module 10 respectively.
It can be understood that, when the power supply end of the power supply protection circuit is switched on, the switch module 20 is switched off the power supply end and the direct charging loop of the protection capacitor, the voltage reduction module 30 will input to the voltage of the slow charging module 40 is reduced to the preset first charging voltage, so that the slow charging module 40 utilizes the first charging voltage to indirectly and slowly charge the protection capacitor, thereby ensuring that the protection capacitor of the power supply protection circuit is not damaged even if the power supply end is connected to a power failure, and realizing the power utilization safety.
It is understood that when the protection voltage across the protection capacitor reaches a predetermined voltage threshold, the auxiliary power supply module 50 converts the protection voltage into an operating voltage of the control module 10 to drive the control module 10.
Further, the control module 10 may be configured to monitor an input voltage of the power supply terminal and a protection voltage across the protection capacitor; when the input voltage is greater than the rated voltage of the protection capacitor, the first control end outputs a first turn-off instruction to control the switch module 20 to turn off the direct charging loop and the subsequent circuit of the power supply end and the protection capacitor, and the second control end outputs a first step-down instruction to control the step-down module 30 to reduce the voltage input to the buffer module 40 to a predetermined second charging voltage, so that the protection voltage across the capacitor is reduced to be lower than the rated voltage.
It is understood that the latter circuit is connected in parallel with the protection capacitor. The auxiliary power supply module 50 may be used to convert the voltage across the capacitor into the working voltage of the control module 10, and when the control module 10 detects that the input voltage is recovered to normal, the buffer circuit in which the buffer module 40 is located is restarted to perform current-limiting charging on the protection capacitor, so that the power supply recovers to normal operation. The process can effectively protect the protective capacitor and the subsequent circuit when the input voltage is over-voltage.
Further, the control module 10 may be configured to monitor a difference between an input voltage of the power supply terminal and a protection voltage across the protection capacitor; when the difference value is greater than a preset first voltage difference value, the second control end outputs a first voltage reduction instruction to control the voltage reduction module 30 to reduce the voltage input to the slow charging module 40 to a preset second charging voltage, so that the slow charging module 40 indirectly and slowly charges the protection capacitor by using the second charging voltage;
further, when the difference value is smaller than a preset first voltage difference value, the first control end outputs a closing instruction to control the switch module 20 to switch on the power supply end and the direct charging loop of the protection capacitor, and the second control end outputs a stopping instruction to control the voltage reducing module 30 to stop working, so as to directly charge the protection capacitor by using the input voltage. Furthermore, the protection capacitor can be charged quickly, so that the impedance of the power supply protection circuit is reduced, and a circuit at the rear stage connected in parallel with the protection capacitor can work normally.
Further, the control module 10 may be further configured to, when the input voltage is higher than the rated voltage of the protection capacitor, output a first disconnection instruction by the first control end to control the switch module 20 to disconnect the direct charging circuit between the power supply end and the protection capacitor, and output a second disconnection instruction by the second control end to control the voltage reduction module 30 to disconnect the slow charging circuit where the slow charging module 40 is located.
It can be understood that when the input voltage is higher than the rated voltage of the protection capacitor, the direct charging loop and the buffer charging loop are disconnected to perform overvoltage protection on the protection capacitor. Further, it should be understood that the rated voltage across the protection capacitor can be used to power the auxiliary power supply module 50, so that the auxiliary power supply module 50 can provide an operating voltage for the control module 10 to drive the control module 10, and ensure that the control module 10 is always in an operating state. When the control module 10 monitors that the input voltage of the power supply end returns to normal, the voltage reduction module 30 is controlled to switch on the slow charging module 40, the slow charging circuit where the slow charging module 40 is located is used for carrying out current-limiting charging on the protection capacitor until the difference value between the input voltage of the power supply end and the protection voltage at the two ends of the protection capacitor is smaller than a preset first voltage difference value, and then the switch module 20 is switched on to directly charge the protection capacitor by using the power supply end until the power supply returns to normal operation. The process can realize overvoltage protection and protect a later-stage power utilization circuit when overvoltage is input. It can be understood that the power utilization circuit and the protection capacitor of the later stage are connected in parallel.
It is understood that the voltage-reducing module 30 includes a power terminal and a ground terminal, the power terminal of the voltage-reducing module 30 is connected to the power supply terminal, and the ground terminal of the voltage-reducing module 30 is grounded.
In the power protection circuit disclosed in this embodiment, when the power supply end of the power protection circuit is connected, the switch module 20 disconnects the direct charging loop between the power supply end and the protection capacitor, and the voltage reduction module 30 reduces the voltage input to the slow charging module 40 to a predetermined first charging voltage, so that the protection capacitor of the power protection circuit can be controllably charged when the power supply is connected, the charging current of the protection capacitor is controllable, and the service life of the protection capacitor is not affected by a large impact current; when the power supply is turned on or off frequently, the voltage reduction module 30 and the buffer module 40 can be used for slowly charging the protection capacitor, so that the loss of the protection capacitor is low, the heating is low, and the fault is not easy to cause.
Example 2
One embodiment of the present application provides a buffer module 40 of a power protection circuit, as shown in fig. 3, including a switch tube, an anti-reverse unit, a freewheeling unit, and a buffer unit.
Exemplarily, the connection between the control terminal Hc1 of the buffering module 40 and the control terminal Jc1 of the voltage decreasing module 30 corresponds to the first connection relationship in the present application, and includes: the control end of the switch tube is connected with the control end Jc1 of the voltage reduction module 30. The first end H1 of the slow charging module 40 is connected to the positive electrode of the power supply terminal, the first end K1 of the switch module 20 and the first sampling terminal of the control module 10, the second end K2 of the switch module 20 is connected to the positive electrode of the protection capacitor, the first sampling terminal of the auxiliary power supply module 50, the second sampling terminal of the control module 10 and the second end H2 of the slow charging module 40, respectively, the negative electrode of the protection capacitor is connected to the negative electrode of the power supply terminal, the second sampling terminal of the auxiliary power supply module 50, the anti-reverse terminal Hf of the slow charging module 40 and the ground, respectively, and the method includes: the control end of the switch tube is connected with the voltage reduction module 30, the first end of the switch tube is connected with the anode of the power supply end, and the second end of the switch tube is connected with the input end of the anti-reverse unit; the output end of the anti-reverse unit is respectively connected with the output end of the follow current unit and one end of the slow charging unit; the other end of the slow charging unit is connected with the anode of the protection capacitor; and the input end of the follow current unit is connected with the negative electrode of the power supply end.
Further, as shown in fig. 4, the switching tube includes one of an NMOS tube, a relay and a transistor. When the switch tube is an NMOS tube, the grid electrode of the NMOS tube is used as the control end of the switch tube, the drain electrode of the NMOS tube is used as the first end of the switch tube, and the source electrode of the NMOS tube is used as the second end of the switch tube.
Furthermore, the anti-reverse unit comprises at least one first diode, an anode of the first diode is used as an input end of the anti-reverse unit, and a cathode of the first diode is used as an output end of the anti-reverse unit.
Further, the freewheel unit includes at least one second diode, an anode of the second diode is used as an input end of the freewheel unit, and a cathode of the second diode is used as an output end of the freewheel unit.
Further, the buffer unit includes an inductor.
It can be understood that when an abrupt voltage is generated across the inductor, other elements may be damaged, and the current may change more smoothly when the voltage changes by using the diode of the freewheeling unit, so as to avoid damage to other elements.
Example 3
One embodiment of the present application provides a buffer module 40 of a power protection circuit, as shown in fig. 2, the buffer module 40 includes a switch tube, an anti-reverse unit, a freewheeling unit, and a buffer unit.
Exemplarily, the connection between the control terminal Hc1 of the buffering module 40 and the control terminal Jc1 of the voltage decreasing module 30 corresponds to the second connection relationship in the present application, and includes: the control end of the switch tube is connected with the control end Jc1 of the voltage reduction module 30; the first end H1 of the slow charging module 40 is connected to the negative electrode of the power supply terminal, the first end K1 of the switch module 20, the ground terminal of the control module 10, the first sampling terminal of the auxiliary power supply module 50 and the ground, the second end K2 of the switch module 20 is connected to the negative electrode of the protection capacitor, the second sampling terminal of the control module 10 and the second end H2 of the slow charging module 40, respectively, the positive electrode of the protection capacitor is connected to the positive electrode of the power supply terminal, the second sampling terminal of the auxiliary power supply module 50, the anti-reverse terminal Hf of the slow charging module 40 and the first sampling terminal of the control module 10, and the method includes: the first end of the switch tube is connected with the output end of the anti-reverse unit, and the second end of the switch tube is connected with the negative electrode of the power supply end; the input end of the anti-reverse unit is respectively connected with the input end of the follow current unit and one end of the slow charging unit; the other end of the slow charging unit is connected with the negative electrode of the protection capacitor; and the output end of the follow current unit is connected with the anode of the power supply end.
When the switch tube comprises an NMOS tube, the anti-reverse unit comprises a first diode, the free-wheeling unit comprises a second diode and the slow-charging unit comprises an inductor:
the grid electrode of the NMOS tube is connected with the voltage reduction module 30, the drain electrode of the NMOS tube is connected with the cathode of the first diode, and the source electrode of the NMOS tube is connected with the cathode of the power supply end; the anode of the first diode is respectively connected with the anode of the second diode and one end of the inductor; the other end of the inductor is connected with the negative electrode of the protection capacitor; and the cathode of the second diode is connected with the anode of the power supply end.
It is to be understood that the present application relates to a power supply apparatus comprising a power supply protection circuit as described herein.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (9)
1. A power supply protection circuit is characterized by comprising a control module, a switch module, a voltage reduction module, a slow charging module, an auxiliary power supply module, a protection capacitor and a power supply end;
the first control end of the control module is connected with the control end of the switch module, the second control end of the control module is connected with the voltage reduction module, and the power supply end of the control module is connected with the power supply end of the auxiliary power supply module;
the control end of the slow charging module is connected with the control end of the voltage reducing module;
the first end of the slow charging module is connected with the anode of the power supply end, the first end of the switch module and the first sampling end of the control module, the second end of the switch module is respectively connected with the anode of the protection capacitor, the first sampling end of the auxiliary power supply module, the second sampling end of the control module and the second end of the slow charging module, and the cathode of the protection capacitor is respectively connected with the cathode of the power supply end, the second sampling end of the auxiliary power supply module, the anti-reverse end of the slow charging module and the ground; or, the first end of slow charging module is connected the negative pole of power supply end the first end of switch module the earthing terminal of control module the first sample terminal of supplementary power module and ground, the second end of switch module is connected respectively the negative pole of protection electric capacity the second sample terminal of control module with the second end of slow charging module, the positive pole of protection electric capacity is connected respectively the positive pole of power supply end the second sample terminal of supplementary power module the anti-reverse end of slow charging module with the first sample terminal of control module.
2. The power protection circuit according to claim 1, wherein the buffer module comprises a switch tube, an anti-reverse unit, a freewheeling unit and a buffer unit;
the control end of the switch tube is used as the control end of the slow charging module and is connected with the control end of the voltage reducing module;
the control end of the switch tube is connected with the voltage reduction module, the first end of the switch tube is used as the first end of the slow charging module and is connected with the anode of the power supply end, and the second end of the switch tube is connected with the input end of the reverse prevention unit;
the output end of the anti-reverse unit is respectively connected with the output end of the follow current unit and one end of the slow charging unit;
the other end of the slow charging unit is used as a second end of the slow charging module and is connected with the anode of the protection capacitor;
the input end of the follow current unit is used as an anti-reverse end of the slow charging module and is connected with the negative electrode of the power supply end.
3. The power protection circuit of claim 2, wherein the switching tube comprises one of an NMOS tube, a relay, and a triode.
4. The power protection circuit according to claim 2, wherein the anti-reverse unit comprises at least one first diode, an anode of the first diode is used as an input terminal of the anti-reverse unit, and a cathode of the first diode is used as an output terminal of the anti-reverse unit.
5. The power protection circuit according to claim 2, wherein the freewheeling unit comprises at least one second diode, an anode of the second diode being an input terminal of the freewheeling unit, and a cathode of the second diode being an output terminal of the freewheeling unit.
6. The power protection circuit of claim 2, wherein the buffer unit comprises an inductor.
7. The power protection circuit according to claim 1, wherein the buffer module comprises a switch tube, an anti-reverse unit, a freewheeling unit and a buffer unit;
the control end of the switch tube is used as the control end of the slow charging module and is connected with the control end of the voltage reducing module;
the first end of the switch tube is connected with the output end of the anti-reverse unit, and the second end of the switch tube is used as the first end of the slow charging module and connected with the negative electrode of the power supply end;
the input end of the anti-reverse unit is respectively connected with the input end of the follow current unit and one end of the slow charging unit;
the other end of the slow charging unit is used as a second end of the slow charging module and is connected with the negative electrode of the protection capacitor;
the output end of the follow current unit is used as the reverse connection prevention end of the slow charging module and is connected with the anode of the power supply end.
8. The power protection circuit of claim 7, wherein when the switch tube comprises an NMOS tube, the reverse-blocking prevention unit comprises a first diode, the free-wheeling unit comprises a second diode, and the buffer unit comprises an inductor:
the grid electrode of the NMOS tube is connected with the voltage reduction module, the drain electrode of the NMOS tube is connected with the cathode of the first diode, and the source electrode of the NMOS tube is connected with the cathode of the power supply end;
the anode of the first diode is respectively connected with the anode of the second diode and one end of the inductor;
the other end of the inductor is connected with the negative electrode of the protection capacitor;
and the cathode of the second diode is connected with the anode of the power supply end.
9. A power supply device characterized in that it comprises a power supply protection circuit as claimed in any one of claims 1 to 8.
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| CN202120547792.XU CN216699817U (en) | 2021-03-16 | 2021-03-16 | Power supply protection circuit and power supply equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134292A (en) * | 2023-10-26 | 2023-11-28 | 深圳清大电子科技有限公司 | Safety protection circuit of display screen |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134292A (en) * | 2023-10-26 | 2023-11-28 | 深圳清大电子科技有限公司 | Safety protection circuit of display screen |
| CN117134292B (en) * | 2023-10-26 | 2024-01-23 | 深圳清大电子科技有限公司 | Safety protection circuit of display screen |
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