CN217063269U - Electronic equipment interface reverse current protection circuit and electronic equipment - Google Patents
Electronic equipment interface reverse current protection circuit and electronic equipment Download PDFInfo
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- CN217063269U CN217063269U CN202220708395.0U CN202220708395U CN217063269U CN 217063269 U CN217063269 U CN 217063269U CN 202220708395 U CN202220708395 U CN 202220708395U CN 217063269 U CN217063269 U CN 217063269U
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Abstract
The invention relates to an electronic equipment interface reverse current protection circuit and electronic equipment, wherein the low-voltage power supply network protection circuit comprises a comparison module and a switch module; the comparison module is electrically connected with the switch module; the comparison module is connected with the target voltage signal and outputs a switch signal according to the target voltage signal, and the switch module controls the connection and disconnection of a connection circuit between the electronic equipment port and the target voltage output end according to the switch signal. Through the technical scheme, the situation that devices inside the electronic equipment are burnt down when reverse current appears at the interface of the electronic equipment is avoided, and the safety of the electronic equipment is improved.
Description
Technical Field
The present disclosure relates to the field of integrated circuit technologies, and in particular, to an electronic device interface reverse current protection circuit and an electronic device.
Background
The interface of the current electronic equipment is provided with a protection chip which can prevent the electronic equipment from being burnt when overcurrent occurs.
In the prior art, the overvoltage protection of the chip inside the electronic device is generally at 5.65V, that is, the overvoltage protection exceeds 5.65V, and then the protection can be triggered to avoid the occurrence of reverse current at the interface of the electronic device, and the reverse current caused by abnormal voltage lower than 5.65V cannot be protected, and the electronic device can be directly shut down after the protection is triggered, which is not beneficial to normal use of a user.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides an electronic device interface reverse current protection circuit and an electronic device, which avoid burning down devices inside the electronic device when a reverse current occurs at an electronic device interface, and improve the safety of the electronic device.
In a first aspect, an embodiment of the present disclosure provides an electronic device interface reverse current protection circuit, including:
a comparison module and a switch module;
the comparison module is electrically connected with the switch module;
the comparison module is connected with a target voltage signal and outputs a switch signal according to the target voltage signal, and the switch module controls the connection and disconnection of a connection circuit between the electronic equipment port and the target voltage output end according to the switch signal.
Optionally, the comparison module includes a comparator, the comparison module includes a target voltage input end, a reference voltage input end and a switch signal output end, the target voltage input end is connected to the target voltage signal, the reference voltage input end is connected to the reference voltage signal, and the output end is electrically connected to the switch module;
and the non-inverting input end of the comparator is used as the reference voltage input end, the inverting input end of the comparator is used as the target voltage input end, and the output end of the comparator is used as the switching signal output end.
Optionally, the switch module comprises: the switch module comprises a switch signal input end, a first communication end and a second communication end; the switching signal input end is electrically connected with the comparison module, the first communication end is electrically connected with the electronic equipment port, and the second communication end is electrically connected with the target voltage output end;
the control end of the first switch is used as the switch signal input end, the first end of the third switch is used as the first communication end, the second end of the third switch is used as the second communication end, the first end of the first switch is electrically connected with the control end of the second switch, the second end of the first switch is grounded, the first end of the second switch is electrically connected with the control end of the third switch, and the second end of the second switch is grounded.
Optionally, the electronic device interface reverse current protection circuit further includes:
the voltage division module comprises a first resistor and a second resistor, the voltage division module comprises a target signal input end and a target voltage output end, the target voltage output end is electrically connected with the comparison module, and the target signal input end is connected with the target voltage signal;
the first end of the first resistor is the target signal input end, the second end of the first resistor and the first end of the second resistor are used as the target voltage output end, and the second end of the second resistor is grounded.
Optionally, the electronic device interface reverse current protection circuit further includes: the hysteresis module comprises a third resistor and a fourth switch, the hysteresis module comprises a first hysteresis end and a second hysteresis end, the first hysteresis end is connected to the target voltage signal, and the second hysteresis end is electrically connected with the first node; the first node is a connection node of the comparison module and the switch module;
a first end of the third resistor is used as the first hysteresis end, and a control end of the fourth switch is used as the second hysteresis end; the second end of the third resistor is electrically connected with the first end of the fourth switch, and the second end of the fourth switch is grounded.
Optionally, the electronic device interface reverse current protection circuit further includes:
the target voltage control module is connected to the target voltage signal and electrically connected with the target voltage output end, and the target voltage control module is used for converting the voltage value of the target voltage signal into a power supply voltage value of the electronic equipment.
Optionally, the target voltage control module includes a control element, a fifth switch, a sixth switch, and an inductor;
the first end of the fifth switch is connected to the target voltage signal, the first control end of the control element is electrically connected with the control end of the fifth switch, the second control end of the control element is electrically connected with the control end of the sixth switch, the second end of the fifth switch and the first end of the sixth switch are electrically connected with the first end of the inductor, the second end of the sixth switch is grounded, and the second end of the inductor is electrically connected with the target voltage output end.
Optionally, the electronic device interface reverse current protection circuit further includes: the first end of the fourth resistor and the first end of the fifth resistor are electrically connected with the first pull-up voltage end, the second end of the fourth resistor is electrically connected with the control end of the first switch, the second end of the fifth resistor is electrically connected with the control end of the second switch, the first end of the sixth resistor is electrically connected with the second pull-up voltage end, and the second end of the sixth resistor is electrically connected with the control end of the third switch.
Optionally, the electronic device interface reverse current protection circuit further includes a first capacitor and a second capacitor, a first end of the first capacitor is connected to the target voltage signal, a second end of the first capacitor is grounded, a first end of the second capacitor is electrically connected to the target voltage output end, and a second end of the second capacitor is grounded.
In a second aspect, an embodiment of the present disclosure further provides an electronic device, including the electronic device interface reverse current protection circuit according to the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
this openly sets up electronic equipment interface reverse current protection circuit includes: a comparison module and a switch module; the comparison module is electrically connected with the switch module; the comparison module is connected with the target voltage signal and outputs a switch signal according to the target voltage signal, and the switch module controls the connection and disconnection of a connection circuit between the electronic equipment port and the target voltage output end according to the switch signal. Therefore, according to the electronic equipment, when the voltage of the electronic equipment port is higher than the voltage of the target voltage output end to generate reverse current, and the target voltage signal is greatly increased, the comparison module controls the switch module to timely cut off the connecting circuit between the electronic equipment port and the target voltage output end, so that devices inside the electronic equipment are prevented from being burnt, and the safety of the electronic equipment is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a reverse current protection circuit of an electronic device interface according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Fig. 1 is a schematic structural diagram of a reverse current protection circuit of an electronic device interface according to an embodiment of the present disclosure. As shown in fig. 1, the electronic device interface reverse current protection circuit includes a comparison module 1 and a switch module 2; the comparison module 1 is electrically connected with the switch module 2; the comparison module 1 is connected with the target voltage signal and outputs a switch signal according to the target voltage signal, and the switch module 2 controls the connection and disconnection of a connection line between the electronic equipment port E1 and the target voltage output end E2 according to the switch signal.
Specifically, as shown in fig. 1, the comparison module 1 may access a target voltage signal, the target voltage signal may be provided by a power adapter of the electronic device, the comparison module 1 accesses the target voltage signal and outputs a switch signal to the switch module 2, and the switch module 2 controls the connection line between the electronic device port E1 and the target voltage output end E2 to be switched on or off according to the switch signal.
Illustratively, when the voltage value of the target voltage signal is in a normal range, for example, the voltage V of the target voltage signal in The voltage is 20V, the switching signal output by the comparison module 1 to the switching control module is a high level signal, and the switching module 2 controls the connection line between the electronic device port E1 and the target voltage output end E2 to be conductive, that is, the target voltage can be output to the electronic device port E1; when the voltage of the electronic equipment port E1 is larger than the voltage of the target voltage output end E2, a reverse current is generated, and the voltage V of the target voltage signal is enabled to be in When the voltage value of the target voltage signal rises to be beyond the normal range, for example, the voltage value of the target voltage signal is raised to 30V, the comparison module 1 outputs a low-level switch signal to the switch control module, and the switch module 2 controls the connection line between the electronic device port E1 and the target voltage output end E2 to be disconnected, that is, the target voltage cannot be output to the electronic device port E1.
The embodiment of the disclosure is electrically connected with the switch module 2 by setting the comparison module 1, the comparison module 1 is used for accessing the target voltage signal and outputting the switch signal according to the target voltage signal, the switch module 2 controls the on-off of the connecting line between the electronic device port E1 and the target voltage output end E2 according to the switch signal, the voltage at the electronic device port E1 is higher than the voltage at the target voltage output end E2 so as to generate a reverse current, when the target voltage signal is greatly increased, the comparison module 1 controls the switch module 2 to timely cut off the connecting line between the electronic device port E1 and the target voltage output end E2, the internal devices of the electronic device are prevented from being burnt, and the safety of the electronic device is improved.
Optionally, as shown in fig. 1, the comparison module 1 includes a comparator 11, the comparison module 1 includes a target voltage input terminal a1, a reference voltage input terminal a2 and a switch signal output terminal A3, the target voltage input terminal a1 is connected to a target voltage signal, the reference voltage input terminal a2 is connected to a reference voltage signal, and the output terminal P1 is electrically connected to the switch module 2; the non-inverting input of the comparator 11 serves as the reference voltage input a2, the inverting input of the comparator 11 serves as the target voltage input a1, and the output P1 of the comparator 11 serves as the switching signal output A3.
Specifically, as shown in fig. 1, the comparing module 1 may be, for example, a comparator 11, an inverting input terminal of the comparator 11 is connected to the target voltage signal, a non-inverting input terminal of the comparator 11 is connected to the reference voltage signal, and an output terminal P1 of the comparator 11 may output the switching signal.
Illustratively, when the voltage value of the target voltage signal is, for example, 20V, and the voltage value of the reference voltage signal is, for example, 22V, the voltage value of the target voltage signal is smaller than the voltage value of the reference voltage signal, the switching signal output by the comparator 11 is a high level signal, and the switching module 2 controls conduction between the electronic device port E1 and the target voltage output terminal E2 according to the high level signal; when the voltage value of the target voltage signal is, for example, 24V, and the voltage value of the reference voltage signal is, for example, 22V, the voltage value of the target voltage signal is greater than the voltage value of the reference voltage signal, the switch signal output by the comparator 11 is a low level signal, and the switch module 2 controls the electronic device port E1 and the target voltage output end E2 to be disconnected according to the low level signal, that is, the electronic device and the device externally connected through the electronic device end are disconnected.
It should be noted that the voltage value of the reference voltage signal may be set according to an actual reverse current protection requirement of the electronic device, which is not limited in the embodiment of the present disclosure.
Alternatively, as shown in fig. 1, the switch module 2 includes: the switch module 2 comprises a first switch Q1, a second switch Q2 and a third switch Q3, and comprises a switch signal input end B1, a first communication end B2 and a second communication end B3; the switch signal input end B1 is electrically connected with the comparison module 1, the first connection end B2 is electrically connected with the electronic device port E1, and the second connection end B3 is electrically connected with the target voltage output end E2; the control terminal G1 of the first switch serves as a switch signal input terminal B1, the first terminal D3 of the third switch serves as a first connection terminal B2, the second terminal S3 of the third switch serves as a second connection terminal B3, the first terminal D1 of the first switch is electrically connected to the control terminal G2 of the second switch, the second terminal S1 of the first switch is grounded, the first terminal D2 of the second switch is electrically connected to the control terminal G3 of the third switch, and the second terminal S2 of the second switch is grounded.
Specifically, as shown in fig. 1, the first switch Q1, the second switch Q2, and the third switch Q3 may be mosfets, a gate of the mosfet may be used as the control terminal G1 of the first switch, a drain of the mosfet may be respectively used as the first terminal D1 of the first switch, a source of the mosfet is used as the second terminal S1 of the first switch, and the port settings of the second switch Q2 and the third switch Q3 may be set with reference to the first switch Q1, which is not described herein in detail in the embodiments of the present disclosure.
Illustratively, when the switching signal is a high-level signal, the voltage of the high-level signal reaches the on voltage of the control terminal G1 of the first switch, the first switch Q1 is turned on, the voltage of the control terminal G2 of the second switch is pulled low, the second switch Q2 is turned off, the voltage of the control terminal G3 of the third switch is pulled high, the third switch Q3 is turned on, and at this time, the connection line between the electronic device port E1 and the target voltage output terminal E2 is turned on; when the switching signal is a low-level signal, the voltage of the low-level signal does not reach the on-voltage of the control terminal G1 of the first switch, the first switch Q1 is turned off, the voltage of the control terminal G2 of the second switch is pulled high and reaches the on-voltage of the control terminal G2 of the second switch, the voltage of the control terminal G3 of the third switch is pulled low, the third switch Q3 is turned off, and at this time, the connection line between the electronic device port E1 and the target voltage output terminal E2 is turned off.
Optionally, as shown in fig. 1, the electronic device interface reverse current protection circuit further includes: the voltage division module 3, the voltage division module 3 includes the first resistance R1 and second resistance R2, the voltage division module 3 includes target signal input end and target voltage output end, the target voltage output end is electrically connected with the comparison module 1, the target signal input end is connected to the target voltage signal; the first terminal H1 of the first resistor is used as a target signal input terminal, the second terminal H2 of the first resistor and the first terminal H3 of the second resistor are used as target voltage output terminals, and the second terminal H4 of the second resistor is grounded.
Specifically, as shown in fig. 1, since the voltage value of the target voltage signal is too high relative to the threshold voltage of the comparison module 1, in order to avoid damage of the too high voltage to the comparison module 1, the first resistor R1 and the second resistor R2 may be provided as the voltage dividing module 3 to lower the voltage value of the target voltage input to the comparison module 1. For example, when the voltage value of the target voltage signal connected to the target signal input end of the voltage dividing module 3 is, for example, 20V, and after the voltage is divided by the first resistor R1 and the second resistor R2, the target voltage output end of the voltage dividing module 3 may, for example, output the voltage value of the target voltage signal to the comparing module 1, which is, for example, 10V. It should be noted that, the resistances of the first resistor R1 and the second resistor R2 may be set according to the threshold voltage of the comparison module 1 and the usage of the electronic device, which is not limited in the embodiment of the present disclosure.
Optionally, as shown in fig. 1, the electronic device interface reverse current protection circuit further includes: the hysteresis module 4, wherein the hysteresis module 4 includes a third resistor R3 and a fourth switch Q4, the hysteresis module 4 includes a first hysteresis terminal and a second hysteresis terminal, the first hysteresis terminal is connected to the target voltage signal, and the second hysteresis terminal is electrically connected to the first node M1; the first node M1 is a connection node between the comparison module 1 and the switch module 2; the first end H5 of the third resistor serves as a first hysteresis end, and the control end G4 of the fourth switch serves as a second hysteresis end; the second terminal H6 of the third resistor is electrically connected to the first terminal D4 of the fourth switch, and the second terminal S4 of the fourth switch is grounded.
Specifically, as shown in fig. 1, when the voltage of the electronic device port E1 is higher than the voltage of the target voltage output terminal E2, so as to generate a reverse current, when the voltage of the target voltage signal connected to the first hysteresis terminal exceeds a normal value, the switching signal output by the comparison module 1 is a low level signal, the low level signal controls the fourth switch Q4 to be turned off, at this time, the third resistor R3 and the fourth switch Q4 do not divide the voltage of the connected target voltage signal any more, after the switching module 2 controls the connection line between the electronic device port E1 and the target voltage output terminal E2 to be turned off, the voltage of the target voltage signal connected to the first hysteresis terminal is a normal value, the switching signal output by the comparison module 1 is a high level signal, the high level signal controls the fourth switch Q4 to be turned on, and at this time, the third resistor R3 and the fourth switch Q4 divide the voltage of the connected target voltage signal.
Due to the voltage dividing function of the hysteresis module 4, the voltage value of the target voltage signal needs to be lower than that when the reverse current protection is triggered, so that the switch control signal output by the comparison module 1 controls the connection between the electronic device port E1 and the target voltage output end E2, for example, the voltage of the critical target voltage signal triggering the reverse current protection is, for example, 24V, at this time, the connection between the electronic device port E1 and the target voltage output end E2 is disconnected, and after the voltage division of the hysteresis module 4, the switch control signal output by the comparison module 1 can control the connection between the electronic device port E1 and the target voltage output end E2 after the voltage of the target voltage signal reaches 22V. Therefore, the voltage of the target voltage signal is divided by the hysteresis module 4, so that when the voltage of the electronic device port E1 is slightly higher than the voltage of the target voltage output end E2, the target voltage signal is slightly increased, the switching signal is in a state of frequent switching of a high level signal and a low level signal, namely, the switching module 2 is damaged due to the fact that the switching module 2 is in the edge of on/off, and the reliability of the electronic device interface reverse current protection circuit is improved.
Optionally, as shown in fig. 1, the electronic device interface reverse current protection circuit further includes: and the target voltage control module 5 is connected with the target voltage signal and electrically connected with the target voltage output end E2, and the target voltage control module 5 is used for converting the voltage value of the target voltage signal into a power supply voltage value of the electronic device.
Specifically, as shown in fig. 1, since the motherboard chip inside the electronic device also needs to be powered and the power supply voltage thereof is generally low, the target voltage control module 5 may be configured as a BUCK Converter (BUCK Converter) circuit, and the BUCK Converter is configured to convert a high dc voltage into a low dc voltage and supply power to the motherboard chip inside the electronic device, for example, 20V voltage of the target voltage signal may be converted into 5V voltage and output power from the target voltage output terminal E2.
Alternatively, as shown in fig. 1, the target voltage control module 5 includes a control element 51, a fifth switch Q5, a sixth switch Q6, and an inductor L; a first end D5 of the fifth switch is connected to a target voltage signal, a first control end G51 of the control element is electrically connected to a control end G5 of the fifth switch, a second control end G52 of the control element is electrically connected to a control end G6 of the sixth switch, a second end S5 of the fifth switch and a first end D6 of the sixth switch are both electrically connected to a first end J1 of the inductor, a second end S6 of the sixth switch is grounded, and a second end J2 of the inductor L is electrically connected to a target voltage output end E2.
Specifically, as shown in fig. 1, the first control terminal G51 of the control element is electrically connected to the control terminal G51 of the fifth switch to control the on and off of the fifth switch Q5, and the second control terminal G52 of the control element is electrically connected to the control terminal G6 of the sixth switch to control the on and off of the sixth switch Q6.
Illustratively, when the control element 51 controls the fifth switch Q5 to be turned on and the sixth switch Q6 to be turned off, the first terminal D5 of the fifth switch is connected to a target voltage signal, the target voltage signal may be output to the target voltage output terminal E2 through the inductor L, and the inductor L converts electric energy into magnetic energy for energy storage; when the control element 51 controls the sixth switch Q6 to turn on or off the fifth switch Q5, the inductor L is in a discharge state, and after the fifth switch Q5 and the sixth switch Q6 are turned on or off alternately, the target voltage control module 5 may convert the voltage of the accessed target voltage signal, for example, 20V, into 5V, and output the voltage to the target voltage output end E2. It should be noted that the principle of the BUCK voltage-reducing circuit is well known to those skilled in the art, and the embodiment of the present disclosure is not described herein again, and in addition, the frequency of the alternate on and off of the fifth switch Q5 and the sixth switch Q6 may be set according to the voltage-reducing requirement of the interface reverse current protection circuit of the electronic device, which is not limited in the embodiment of the present disclosure.
Optionally, as shown in fig. 1, the electronic device interface reverse current protection circuit further includes: a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, wherein a first end H7 of the fourth resistor and a first end H9 of the fifth resistor are electrically connected with the first pull-up voltage end F1, a second end H8 of the fourth resistor is electrically connected with the control end G1 of the first switch, a second end H10 of the fifth resistor is electrically connected with the control end G2 of the second switch, a first end H11 of the sixth resistor is electrically connected with the second pull-up voltage end F2, and a second end H12 of the sixth resistor is electrically connected with the control end G3 of the third switch.
Specifically, as shown in fig. 1, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 may be, for example, pull-up resistors, and for example, when the comparison module 1 outputs a high-level signal, and the voltage of the high-level signal does not reach the voltage of the control terminal G1 of the first switch, the pull-up action of the fourth resistor R4 is used to make the high-level signal reach the voltage of the control terminal G1 of the first switch, so as to turn on the first switch Q1.
When the comparison module 1 outputs a low level signal, the first switch Q1 is turned off, the control terminal G2 of the second switch is electrically connected to the second terminal H10 of the fifth resistor, and the voltage of the control terminal G2 of the second switch reaches the on-voltage by using the pull-up action of the fifth resistor R5, so that the second switch Q2 is turned on, and after the second switch Q2 is turned on, the voltage of the control terminal G3 of the third switch is pulled down, so that the third switch Q3 is turned off. When the comparing module 1 outputs a low level signal, the first switch Q1 is turned on, the voltage at the control terminal G2 of the second switch is pulled low, the second switch Q2 is turned off, the control terminal G3 of the third switch is electrically connected to the second terminal H12 of the sixth resistor, and the voltage at the control terminal G3 of the third switch reaches the on-voltage by the pull-up action of the sixth resistor R6, so that the third switch Q3 is turned on. It should be noted that, the resistances of the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 may be set according to the on-voltage of the control terminal G1 of the first switch and the voltage value of the level signal output by the comparing module 1, which is not limited in the embodiment of the disclosure.
Optionally, as shown in fig. 1, the electronic device interface reverse current protection circuit further includes a first capacitor C1 and a second capacitor C2, a first end I1 of the first capacitor is connected to the target voltage signal, a second end I2 of the first capacitor is connected to ground, a first end I3 of the second capacitor is electrically connected to the target voltage output end E2, and a second end I4 of the second capacitor is connected to ground.
Specifically, as shown in fig. 1, abnormal electrical signals such as high-frequency signals or noise signals may exist in the target voltage signal, and if the abnormal electrical signals output the target voltage output end E2, power supply output of a subsequent circuit may be interfered. In addition, the first end I3 of the second capacitor is electrically connected with the target voltage output end E2, the second end I4 of the second capacitor is grounded, and the second capacitor C2 is used to filter the high-frequency signal or the clutter signal in the voltage signal output by the target voltage output end E2, so that the stability of supplying power to the motherboard chip by the target voltage output end E2 is improved.
The embodiment of the disclosure generates reverse current when the voltage of the electronic device port is higher than the voltage of the target voltage output end, so that the target voltage signal is greatly increased, the comparison module controls the switch module to timely cut off the connecting circuit between the electronic device port and the target voltage output end, the electronic device cannot be directly shut down, the devices inside the electronic device are prevented from being burnt, and the safety of the electronic device is improved. In addition, the detection of the target voltage signal is used for replacing the detection of the voltage signal of the target voltage output end, the problem that false triggering is easily caused due to the fact that the difference value of the voltage signal of the target voltage output end is small is solved, and the accuracy of protecting the electronic equipment is improved.
The embodiment of the present disclosure further provides an electronic device, where the electronic device includes the electronic device interface reverse current protection circuit according to the embodiment, so that the electronic device provided in the embodiment of the present disclosure has the beneficial effects described in the embodiment. In addition, the electronic device described in the embodiment of the present disclosure may be a computer, a mobile phone, or the like, which is not specifically limited in this embodiment of the present disclosure.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be 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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An electronic device interface reverse current protection circuit, comprising:
the device comprises a comparison module and a switch module;
the comparison module is electrically connected with the switch module;
the comparison module is connected to a target voltage signal and outputs a switch signal according to the target voltage signal, and the switch module controls the connection and disconnection of a connecting line between the electronic equipment port and the target voltage output end according to the switch signal.
2. The electronic device interface reverse current protection circuit of claim 1, wherein the comparison module comprises a comparator, the comparison module comprises a target voltage input terminal, a reference voltage input terminal and a switch signal output terminal, the target voltage input terminal is connected to the target voltage signal, the reference voltage input terminal is connected to the reference voltage signal, and the output terminal is electrically connected to the switch module;
and the non-inverting input end of the comparator is used as the reference voltage input end, the inverting input end of the comparator is used as the target voltage input end, and the output end of the comparator is used as the switching signal output end.
3. The electronic device interface reverse current protection circuit of claim 1, wherein the switch module comprises: the switch module comprises a switch signal input end, a first communication end and a second communication end; the switching signal input end is electrically connected with the comparison module, the first communication end is electrically connected with the electronic equipment port, and the second communication end is electrically connected with the target voltage output end;
the control end of the first switch is used as the switch signal input end, the first end of the third switch is used as the first communication end, the second end of the third switch is used as the second communication end, the first end of the first switch is electrically connected with the control end of the second switch, the second end of the first switch is grounded, the first end of the second switch is electrically connected with the control end of the third switch, and the second end of the second switch is grounded.
4. The electronic device interface reverse current protection circuit of claim 1, further comprising:
the voltage division module comprises a first resistor and a second resistor, the voltage division module comprises a target signal input end and a target voltage output end, the target voltage output end is electrically connected with the comparison module, and the target signal input end is connected with the target voltage signal;
the first end of the first resistor is used as the target signal input end, the second end of the first resistor and the first end of the second resistor are used as the target voltage output end, and the second end of the second resistor is grounded.
5. The electronic device interface reverse current protection circuit of claim 1, further comprising:
the hysteresis module comprises a third resistor and a fourth switch, the hysteresis module comprises a first hysteresis end and a second hysteresis end, the first hysteresis end is connected to the target voltage signal, and the second hysteresis end is electrically connected with the first node; the first node is a connection node of the comparison module and the switch module;
a first end of the third resistor is used as the first hysteresis end, and a control end of the fourth switch is used as the second hysteresis end; the second end of the third resistor is electrically connected with the first end of the fourth switch, and the second end of the fourth switch is grounded.
6. The electronic device interface reverse current protection circuit of claim 1, further comprising:
the target voltage control module is connected with the target voltage signal and is electrically connected with the target voltage output end, and the target voltage control module is used for converting the voltage value of the target voltage signal into the power supply voltage value of the electronic equipment.
7. The electronic device interface reverse current protection circuit of claim 6, wherein the target voltage control module comprises a control element, a fifth switch, a sixth switch, and an inductor;
the first end of the fifth switch is connected to the target voltage signal, the first control end of the control element is electrically connected with the control end of the fifth switch, the second control end of the control element is electrically connected with the control end of the sixth switch, the second end of the fifth switch and the first end of the sixth switch are electrically connected with the first end of the inductor, the second end of the sixth switch is grounded, and the second end of the inductor is electrically connected with the target voltage output end.
8. The electronic device interface reverse current protection circuit of claim 3, further comprising: the first end of the fourth resistor and the first end of the fifth resistor are electrically connected with the first pull-up voltage end, the second end of the fourth resistor is electrically connected with the control end of the first switch, the second end of the fifth resistor is electrically connected with the control end of the second switch, the first end of the sixth resistor is electrically connected with the second pull-up voltage end, and the second end of the sixth resistor is electrically connected with the control end of the third switch.
9. The electronic device interface reverse current protection circuit of claim 1, further comprising a first capacitor and a second capacitor, wherein a first terminal of the first capacitor is connected to the target voltage signal, a second terminal of the first capacitor is connected to ground, a first terminal of the second capacitor is electrically connected to the target voltage output terminal, and a second terminal of the second capacitor is connected to ground.
10. An electronic device comprising the electronic device interface reverse current protection circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708395.0U CN217063269U (en) | 2022-03-24 | 2022-03-24 | Electronic equipment interface reverse current protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708395.0U CN217063269U (en) | 2022-03-24 | 2022-03-24 | Electronic equipment interface reverse current protection circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN217063269U true CN217063269U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220708395.0U Active CN217063269U (en) | 2022-03-24 | 2022-03-24 | Electronic equipment interface reverse current protection circuit and electronic equipment |
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| Country | Link |
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| CN (1) | CN217063269U (en) |
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