CN111786368A - Power-off protection circuit and electronic equipment - Google Patents
Power-off protection circuit and electronic equipment Download PDFInfo
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- CN111786368A CN111786368A CN202010670797.1A CN202010670797A CN111786368A CN 111786368 A CN111786368 A CN 111786368A CN 202010670797 A CN202010670797 A CN 202010670797A CN 111786368 A CN111786368 A CN 111786368A
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The application provides a power-off protection circuit and electronic equipment, this circuit includes a positive voltage discharge unit, and positive voltage discharge unit includes: the positive voltage access end is used for being connected with a positive voltage output end of the main power supply circuit; the first control signal access end is used for connecting a mark signal end of the main power circuit, the mark signal end is used for marking the working state of the main power circuit, the level of the mark signal end is high level when the main power circuit normally works, and the level of the mark signal end is low level when the main power circuit is powered off and does not work; and one part of the first switch devices in the first switch devices is connected with the positive voltage access end and one end of the first control signal access end, and the other part of the first switch devices in the first switch devices is connected with the positive voltage access end and the first control signal access end respectively, so that the protection of the main power circuit is realized when the main power circuit is not operated during power failure.
Description
Technical Field
The application relates to the field of circuits, in particular to a power-off protection circuit and electronic equipment.
Background
For some high-precision circuits, electric energy still exists in the circuit after the circuit is powered off, so that the circuit has an unstable condition, redundant electric energy needs to be released, the circuit is prevented from being damaged by high-voltage static electricity such as static electricity, lightning stroke and the like under the condition of power off, and a high-performance power-off protection circuit is lacked in the prior art.
The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, certain information may be included in the background that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The main objective of the present application is to provide a power-off protection circuit and an electronic device, so as to solve the problem that a high-performance power-off protection circuit is lacked in the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a power-off protection circuit including a positive voltage discharge unit including: the positive voltage access end is used for being connected with a positive voltage output end of the main power supply circuit; the first control signal access end is used for being connected with a mark signal end of the main power circuit, the mark signal end is used for marking the working state of the main power circuit, when the main power circuit normally works, the level of the mark signal end is high level, and when the main power circuit is powered off and does not work, the level of the mark signal end is low level; a plurality of first switching devices, a portion of the first switching devices of the plurality of first switching devices being connected to one of the positive voltage access terminal and the first control signal access terminal, another portion of the first switching devices of the plurality of first switching devices being connected to the positive voltage access terminal and the first control signal access terminal, respectively.
Further, the power-off protection circuit further includes a negative voltage discharge unit, and the negative voltage discharge unit includes: the negative voltage access end is used for connecting a negative voltage output end of the main power supply circuit; the second control signal access end is used for connecting the mark signal end; a plurality of second switching devices, a portion of the plurality of second switching devices being connected to one of the negative voltage input and the second control signal input, another portion of the plurality of second switching devices being connected to the negative voltage input and the first control signal input, respectively.
Further, the first switching device is a triode, the first switching device includes three devices, which are respectively a first NPN type triode, a second NPN type triode and a first PNP type triode, the positive voltage discharge unit further includes a first resistor module, a second resistor module, a third resistor module, a fourth resistor module and a voltage stabilizing diode, a first end of the first resistor module is connected to a first control signal access terminal, a second end of the first resistor module is connected to a base of the first NPN type triode, an emitter of the first NPN type triode is connected to a ground terminal, a collector of the first NPN type triode is connected to a first end of the second resistor module and a base of the second NPN type triode respectively, a second end of the second resistor module is connected to a positive power terminal, and an emitter of the second NPN type triode is connected to the ground terminal, the collecting electrode of second NPN type triode respectively with the first end of third resistance module with the base of first PNP type triode is connected, the second end of third resistance module with the positive voltage incoming end is connected, the projecting pole of first PNP type triode with the first end of fourth resistance module is connected, the second end of fourth resistance module with the positive voltage incoming end is connected, the collecting electrode of first PNP type triode with zener diode's negative pole is connected, zener diode's positive pole with the earthing terminal is connected.
Further, the second switching device is a triode, the second switching device includes two second PNP type triode, two third NPN type triode and two fourth NPN type triode, the negative voltage discharge unit further includes a fifth resistor module, a sixth resistor module, a seventh resistor module and an eighth resistor module, a first end of the fifth resistor module is connected to the second control signal access end, a second end of the fifth resistor module is connected to an emitter of the second PNP type triode, a base of the second PNP type triode is connected to a first end of the sixth resistor module, a collector of the fourth NPN type triode and a ground end, a collector of the second PNP type triode is connected to a first end of the seventh resistor module and a base of the third NPN type triode, and a second end of the seventh resistor module is connected to the negative voltage access end, an emitting electrode of the third NPN type triode is connected with the negative voltage access end, a collector electrode of the third NPN type triode is connected with a second end of the sixth resistance module and a base electrode of the fourth NPN type triode respectively, an emitting electrode of the fourth NPN type triode is connected with a first end of the eighth resistance module, and a second end of the eighth resistance module is connected with the negative voltage access end.
Further, the voltage accessed by the positive voltage access end is one of the following voltages: +16V, +12V, + 5V.
Further, the voltage that negative voltage incoming end inserts is one of following: -16V, -12V, -10V.
Further, the first resistance module includes one or more first resistances, the second resistance module includes one or more second resistances, the third resistance module includes one or more third resistances, and the fourth resistance module includes one or more fourth resistances.
Further, the fifth resistance module includes one or more fifth resistances, the sixth resistance module includes one or more sixth resistances, the seventh resistance module includes one or more seventh resistances, and the eighth resistance module includes one or more eighth resistances.
Further, the circuit network in which the positive voltage output is located comprises one or more inductive devices and one or more capacitive devices.
Further, the circuit network where the negative voltage output is located includes one or more inductive devices and one or more capacitive devices.
According to an aspect of the present application, there is provided an electronic device including a main power supply circuit and a power-off protection circuit, the power-off protection circuit being any one of the power-off protection circuits.
By applying the technical scheme, because part of the first switch devices are connected with one of the positive voltage access end and the first control signal access end, the other part of the first switch devices are respectively connected with the positive voltage access end and the first control signal access end, when the main power circuit is not operated when power is down, the level of the mark signal end is low level, the low level of the mark signal end enables the first switch device connected with the mark signal end to be switched on or switched off, and the switching-on of the first switch device connected with the positive voltage access end enables the circuit network where the positive voltage output end in the main power circuit is located to discharge through the first switch device, so that the electric energy stored in the energy storage element in the circuit network where the positive voltage output end is located is released at the moment of power-off of the main power circuit, the damage of the precision components by redundant electric energy is prevented, the protection of the precision components is realized, and the stability of the main power, the damage rate of the precision components is reduced, so that after-sale cost is reduced, and when the main power circuit works normally, the main power circuit is controlled to work normally by controlling the on or off of each second switching device.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 shows a schematic diagram of a power down protection circuit according to an embodiment of the present application;
FIG. 2 shows a schematic diagram of yet another outage protection circuit according to an embodiment of the present application; and
FIG. 3 shows a schematic diagram of a main power supply circuit according to an embodiment of the application;
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As described in the background of the invention, a high-performance power-off protection circuit is absent in the prior art, and in order to solve the problem of the absence of the high-performance power-off protection circuit, embodiments of the present application provide a power-off protection circuit and an electronic device.
According to an embodiment of the present application, there is provided a power-off protection circuit.
Fig. 1 is a schematic diagram of a power-off protection circuit according to an embodiment of the present application. As shown in fig. 1, the power-off protection circuit includes a positive voltage discharge unit, and the positive voltage discharge unit includes:
the positive voltage access end VIP is used for connecting a positive voltage output end of the main power supply circuit;
a first control signal input end CTL1, wherein the first control signal input end CTL1 is configured to be connected to a flag signal end of the main power circuit, the flag signal end is configured to flag an operating state of the main power circuit, a level of the flag signal end is a high level when the main power circuit operates normally, and the level of the flag signal end is a low level when the main power circuit does not operate due to power down;
a plurality of first switching devices, a portion of said first switching devices of said plurality of first switching devices being connected to one of said positive voltage terminal VIP and said first control signal terminal CTL1, another portion of said first switching devices of said plurality of first switching devices being connected to said positive voltage terminal VIP and said first control signal terminal CTL1, respectively.
In the scheme, because part of the first switch devices are connected with the positive voltage access end and one end of the first control signal access end, the other part of the first switch devices are respectively connected with the positive voltage access end and the first control signal access end, when the main power circuit is not operated after power failure, the level of the mark signal end is low level, the low level of the mark signal end enables the first switch device connected with the mark signal end to be switched on or switched off, and the switching on of the first switch device connected with the positive voltage access end enables the circuit network where the positive voltage output end in the main power circuit is located to discharge through the first switch device, so that the electric energy stored in the energy storage element in the circuit network where the positive voltage output end is located is released at the moment of power failure of the main power circuit, the precision components are prevented from being damaged by redundant electric energy, the protection of the precision components is realized, and the stability of the main power circuit, the damage rate of the precision components is reduced, so that after-sale cost is reduced, and when the main power circuit works normally, the main power circuit is controlled to work normally by controlling the on or off of each second switching device.
Specifically, the main circuit, which is the main power supply circuit, may be a high-precision circuit including a plurality of precision components.
It should be noted that the number and connection relationship of the first switching devices can be adjusted according to the voltage withstanding condition of the load in the main power supply circuit.
Fig. 2 is a schematic diagram of another power-off protection circuit according to an embodiment of the present application. As shown in fig. 2, the power-off protection circuit further includes a negative voltage discharging unit, where the negative voltage discharging unit includes a negative voltage input end VIF, a second control signal input end CTL2, and a plurality of second switching devices, and the negative voltage input end VIF is used for connecting to the negative voltage output end of the main power circuit; the second control signal access end CTL2 is used for connecting the flag signal end; some of the plurality of second switching devices are connected to one of the negative voltage input terminal VIF and the second control signal input terminal CTL2, and another of the plurality of second switching devices are connected to the negative voltage input terminal VIF and the first control signal input terminal CTL1, respectively. Because part of the second switch devices are connected with one end of the negative voltage access end VIF and the second control signal access end CTL2, the other part of the second switch devices are respectively connected with the negative voltage access end VIF and the first control signal access end CTL1, when the main power circuit is in power failure and does not work, the level of the mark signal end is low level, the low level of the mark signal end enables the second switch device connected with the mark signal end to be switched on or switched off, and the switching on of the second switch device connected with the negative voltage access end VIF enables the circuit network where the negative voltage output end in the main power circuit is located to discharge through the second switch device, so that the electric energy stored in the energy storage element in the circuit network where the negative voltage output end is located is released at the moment of power failure of the main power circuit, the damage of precision components by redundant electric energy is prevented, the protection of the precision components is realized, and the stability of the main power, the damage rate of the precision components is reduced, so that after-sale cost is reduced, and when the main power circuit works normally, the main power circuit is controlled to work normally by controlling the on or off of each second switching device.
It should be noted that the number and connection relationship of the second switching devices can be adjusted according to the voltage withstanding condition of the load in the main power supply circuit.
In another embodiment of the present application, the first switching device includes a MOS transistor or a BJT, and the second switching device includes a MOS transistor or a triode, but the first switching device may also be other devices that can perform a switching function.
In another embodiment of the present application, as shown in fig. 1, the first switching device is a transistor, the first switching device includes three first NPN transistors Q14, Q11 and Q8, the positive voltage discharging unit further includes a first resistor module R159, a second resistor module R157, a third resistor module R152, a fourth resistor module R153 and a zener diode D10, a first end of the first resistor module R159 is connected to a first control signal input terminal CTL1, a second end of the first resistor module R159 is connected to a base of the first NPN transistor Q14, an emitter of the first NPN transistor Q14 is connected to a ground terminal GND, a collector of the first NPN transistor Q14 is connected to a first end of the second resistor module R157 and a base of the second NPN transistor Q11, a second end of the second resistor module R157 is connected to a positive power terminal P5V, an emitter of the second NPN transistor Q11 is connected to the ground GND, a collector of the second NPN transistor Q11 is connected to a first terminal of the third resistor block R152 and a base of the first PNP transistor Q8, respectively, a second terminal of the third resistor block R152 is connected to the positive voltage input terminal VIP, an emitter of the first PNP transistor Q8 is connected to a first terminal of the fourth resistor block R153, a second terminal of the fourth resistor block R153 is connected to the positive voltage input terminal VIP, a collector of the first PNP transistor Q8 is connected to a negative terminal of the zener diode D10, a positive terminal of the zener diode D10 is connected to the ground GND, and when the main power supply circuit is powered off, the level of the flag signal terminal is low, the first NPN transistor Q14 is not turned on, and the base voltage of the second NPN transistor Q11 is high, the second NPN type triode Q11 is turned on, at this time, the base of the first PNP type triode Q8 is at a low level, the first PNP type triode Q8 is turned on, and the circuit network where the positive voltage output terminal is located is rapidly discharged through the fourth resistance module R153, at this time, the level of the positive voltage output terminal is pulled down, which reduces interference with precision components in the main power supply circuit, prevents the precision components from being damaged by surplus electric energy, realizes protection of the precision components and improves stability of the main power supply circuit, reduces damage rate of the precision components and lowers after-sales cost, when the main power supply circuit normally works, the level of the signal end is at a high level, the first NPN type triode Q14 is turned on, so that the base voltage of the second NPN type triode Q11 is at a low level, the second NPN type triode Q11 is not turned on, the base of the first PNP type triode Q8 is at a high level, the first PNP type triode Q8 is not turned on, the main power circuit is not discharged and works stably.
In still another embodiment of the present invention, as shown in fig. 2, the second switching device is a triode, the second switching device includes two second PNP triode Q6, a third NPN triode Q12 and a fourth NPN triode Q9, the negative voltage discharging unit further includes a fifth resistor module R150, a sixth resistor module R156, a seventh resistor module R160 and an eighth resistor module R161, a first end of the fifth resistor module R150 is connected to the second control signal input terminal CTL2, a second end of the fifth resistor module R150 is connected to an emitter of the second PNP triode Q6, a base of the second PNP triode Q6 is connected to a first end of the sixth resistor module R156, a collector of the fourth NPN triode Q9 and a ground terminal GND, and a collector of the second PNP triode Q6 is connected to a first end of the seventh resistor module R160 and a base of the third NPN triode Q12, a second end of the seventh resistor module R160 is connected to the negative voltage input terminal VIF, an emitter of the third NPN transistor Q12 is connected to the negative voltage input terminal VIF, a collector of the third NPN transistor Q12 is connected to the second end of the sixth resistor module R156 and a base of the fourth NPN transistor Q9, an emitter of the fourth NPN transistor Q9 is connected to the first end of the eighth resistor module R161, a second end of the eighth resistor module R161 is connected to the negative voltage input terminal VIF, when the main power circuit is powered off and does not operate, a level of the flag signal terminal is low, the second PNP transistor Q6 is turned off, the third NPN transistor Q12 is turned off, a base voltage of the fourth NPN transistor Q9 is 0 (low level), and an emitter voltage is a negative voltage (e.g., -10V), so that the fourth NPN transistor Q9 is turned on, the circuit network where the negative voltage output end is located is discharged, and the negative voltage output end works in a stable state, so that electric energy stored in an energy storage element in the circuit network where the negative voltage output end is located is released at the moment of power failure of the main power circuit, the precision components are prevented from being damaged by redundant electric energy, the precision components are protected, the stability of the main power circuit is improved, the damage rate of the precision components is reduced, and the after-sales cost is reduced; when the main power circuit normally works, the level of the signal end is high level, the second PNP type triode Q6 is conducted, the base electrode of the third NPN type triode Q12 is high level at the moment, the third NPN type triode Q12 is conducted, therefore, the base electrode of the fourth NPN type triode Q9 is equal to the voltage of the emitter electrode, the fourth NPN type triode Q9 is turned off, the main power circuit is not discharged, and the main power circuit stably works.
In another embodiment of the present application, the voltage accessed by the positive voltage access terminal is one of the following voltages: +16V, +12V, +5V, of course, the voltage that positive voltage incoming end inserts may also be the positive voltage except +16V, +12V, + 5V.
In another embodiment of the present application, the voltage connected to the negative voltage input terminal is one of the following: the voltage connected to the negative voltage input end can be negative voltage except-16V, -12V, -10V, of course.
In yet another embodiment of the present application, the first resistor module includes one or more first resistors, the second resistor module includes one or more second resistors, the third resistor module includes one or more third resistors, the fourth resistor module includes one or more fourth resistors, the first resistors are connected in series, in parallel, or in series-parallel to form the first resistor module, the second resistors are connected in series, in parallel, or in series-parallel to form the second resistor module, the third resistors are connected in series, in parallel, or in series-parallel to form the third resistor module, and the fourth resistors are connected in series, in parallel, or in series-parallel to form the fourth resistor module.
In yet another embodiment of the present application, the fifth resistor module includes one or more fifth resistors, the sixth resistor module includes one or more sixth resistors, the seventh resistor module includes one or more seventh resistors, the eighth resistor module includes one or more eighth resistors, the fifth resistors are connected in series, in parallel, or in series-parallel to form the fifth resistor module, the sixth resistors are connected in series, in parallel, or in series-parallel to form the sixth resistor module, the seventh resistors are connected in series, in parallel, or in series-parallel to form the seventh resistor module, and the eighth resistors are connected in series, in parallel, or in series-parallel to form the eighth resistor module.
In another embodiment of the present application, the circuit network where the positive voltage output terminal is located includes one or more inductive devices and one or more capacitive devices, the inductive devices include inductors, the capacitive devices include capacitors, both the inductors and the capacitors are energy storage elements, when the main power circuit is powered off, energy is often stored in the inductors and the capacitors, and the power-off protection circuit is used to release the stored energy, so as to prevent precision components in the main power circuit from being damaged due to discharge of the inductors or the capacitors.
In another embodiment of the present application, the circuit network where the negative voltage output terminal is located includes one or more inductive devices and one or more capacitive devices, where the inductive devices include inductors, the capacitive devices include capacitors, and both the inductors and the capacitors are energy storage elements, and when the main power circuit is powered off, energy is often stored in the inductors and the capacitors, and the power-off protection circuit is used to release the stored energy, so as to prevent precision components in the main power circuit from being damaged due to discharge of the inductors or the capacitors.
Another exemplary embodiment of the present application provides an electronic device, including a main power circuit and a power-off protection circuit, where the power-off protection circuit is any one of the power-off protection circuits described above, because a part of the first switch device is connected to one of the positive voltage input terminal and the first control signal input terminal, and another part of the first switch device is connected to the positive voltage input terminal and the first control signal input terminal, respectively, when the main power circuit does not work, the level of the flag signal terminal is low, the low level of the flag signal terminal turns on or off the first switch device connected to the flag signal terminal, and the turning on of the first switch device connected to the positive voltage input terminal causes the circuit network where the positive voltage output terminal is located in the main power circuit to discharge through the first switch device, thereby realizing that the electric energy stored in the energy storage element in the circuit network where the positive voltage output terminal is located at the moment of power-off of the main power circuit, the power-off protection circuit in the electronic equipment has the advantages that the precision components are prevented from being damaged by redundant electric energy, the protection of the precision components is realized, the stability of the main power circuit is improved, the damage rate of the precision components is reduced, the after-sales cost is reduced, when the main power circuit normally works, the normal work of the main power circuit is controlled by controlling the on-off of each second switch component, namely, the power-off protection circuit in the electronic equipment realizes the protection of the main power circuit.
In a specific embodiment of the present application, the main power circuit has three outputs, i.e. a first positive voltage output terminal VOFFSET (8.5V) and a negative voltage output terminal VRST (-10V), the second positive voltage output terminal VBIAS (16V), the main power circuit further includes a main power U38, the main power U38 includes a pin FB1 No. 1, a pin FB4 No. 2, a pin BASE No. 3, a pin VIN No. 4, a pin SW No. 5, a pin SW _1 No. 6, a pin PGND No. 7, a pin PGND No. 8, a pin SUP No. 9, a pin PG No. 10, a pin GND No. 11, a pin FB3 No. 12, a pin OUT3 No. 13, a pin C2 No. 14 +, a pin C2-/MODE No. 15, a pin C1+ No. 16, a pin C1+ No. 17, a pin DRV No. 18, a pin GND _1 No. 19, a pin REF No. 20, a pin 2 No. 21, a pin COMP No. 22, a pin ENR No. 23, a pin No. 24 and a pin EPAD No. 25; the circuit network where the first positive voltage output terminal VOFFSET is located includes a capacitor C224, a capacitor C223, a resistor R145, a resistor R143, a resistor R260, a capacitor C222, and a TEST48 (TEST point 48); the main power circuit further comprises a DMD _ PG terminal, a MOS transistor Q5, a DMD _ PWR _ EN _ IN terminal, a capacitor C220, an inductor L10, a diode D9, a DMD _ PWR _ EN terminal, a capacitor C221, a resistor R141, a resistor R144, a resistor R142, a capacitor C225, a capacitor C226, a capacitor C229, a capacitor C227, a capacitor C228, a capacitor C230, a capacitor C235, a diode DN1, a diode DN2, a resistor R146, a resistor R261 and a resistor R147, a circuit network where the negative voltage output end VRST is located comprises a TEST49 (TEST point 49), a capacitor C231 and a capacitor C232, a circuit network where the second positive voltage output end VBIAS is located comprises a TEST50 (TEST point 50), a capacitor C237, a capacitor C238, a resistor R148 and a resistor R149, the DMD _ PG terminal is connected with a No. 10 pin PG of the main power circuit U38, a TEST51 (TEST point 51) is connected with a connecting line between the DMD _ PG terminal and the No. PG terminal 10 pin, the IN is connected with the inductor Q5 and the MOS transistor Q10, inductor L10 is connected to pin VIN No. 4 of main power U38, the positive electrode of diode D9 is connected to pin SW _1 No. 6 of main power U38, the negative electrode of diode D9 is connected to MOS transistor Q5, the DMD _ PWR _ EN terminal is connected to pin EN No. 24, the connection mode of each device in the main power circuit is specifically shown in 3, the DMD _ PWR _ EN terminal connected to pin EN No. 24 is the flag signal terminal of the main power circuit, when the circuit is actually operated, the DMD _ PWR _ EN terminal is connected to CTL1 of the first control signal in fig. 1, the DMD _ PWR _ EN terminal is connected to second control signal input terminal 2 in fig. 2, the first positive voltage output terminal VOFFSET is connected to positive voltage input terminal VIP in fig. 1, the second positive voltage output terminal VBIAS is connected to positive voltage input terminal VIP in fig. 1, the negative voltage output terminal VRST is connected to negative voltage input terminal in fig. 2, and the negative voltage circuit is connected to the positive voltage output unit and the main power unit corresponding to the main power discharge unit, when the main power circuit is powered off, discharge of positive voltage and negative voltage is realized, precise components are protected from being damaged, a new circuit consisting of the main power circuit and the power-off protection circuit is only provided with a plurality of simple electronic components on the basis of the main power circuit, the stability of the main power circuit is improved, the complexity of the circuit is not obviously improved, the increase of the stability of the main power circuit reduces the occurrence of component damage conditions in the main power circuit caused by space interference (high-voltage static electricity, lightning stroke and the like), the competitiveness of the circuit is increased, and the practical engineering application value is higher.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
1) the power-off protection circuit comprises a main power circuit, a first switch device, a second switch device, a marking signal end, a first switch device, a second switch device, a positive voltage input end, a first control signal input end, a second control signal input end, a first switch device, a second switch device, a first switch device and a second switch device, wherein the first switch device is connected with the positive voltage input end and the second control signal input end respectively, when the main power circuit does not work due to power failure, the level of the marking signal end is low level, the first switch device connected with the marking signal end is switched on or switched off due to the low level of the marking signal end, and the circuit network where the positive voltage output end is located in the main power circuit discharges through the first switch device, so that electric energy stored in an energy storage element in the circuit network where the positive voltage output end is located is released at the moment of power failure of the main power circuit, the damage of precise components due to redundant, the damage rate of the precision components is reduced, so that after-sale cost is reduced, and when the main power circuit works normally, the main power circuit is controlled to work normally by controlling the on or off of each second switching device.
2) The electronic equipment comprises a main power circuit, a positive voltage input end, a first control signal input end, a second control signal input end, a first switch device, a second switch device, a marking signal end, a first switch device and a second switch device, wherein the first switch device is connected with the positive voltage input end and the first control signal input end, the other part of the first switch device is respectively connected with the positive voltage input end and the first control signal input end, when the main power circuit is not operated due to power failure, the level of the marking signal end is low level, the first switch device connected with the marking signal end is switched on or switched off due to the low level of the marking signal end, and the circuit network where the positive voltage output end is located in the main power circuit discharges through the first switch device, so that the electric energy stored in an energy storage element in the circuit network where the positive voltage output end is located is released at the moment of power failure of the main power circuit, the damage of precise, the damage rate of the precision components is reduced, so that after-sale cost is reduced, when the main power circuit works normally, the main power circuit is controlled to work normally by controlling the on or off of the second switching devices, namely, the power-off protection circuit in the electronic equipment realizes protection of the main power 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.
Claims (11)
1. A power-off protection circuit comprising a positive voltage discharge unit, said positive voltage discharge unit comprising:
the positive voltage access end is used for being connected with a positive voltage output end of the main power supply circuit;
the first control signal access end is used for being connected with a mark signal end of the main power circuit, the mark signal end is used for marking the working state of the main power circuit, when the main power circuit normally works, the level of the mark signal end is high level, and when the main power circuit is powered off and does not work, the level of the mark signal end is low level;
a plurality of first switching devices, a portion of the first switching devices of the plurality of first switching devices being connected to one of the positive voltage access terminal and the first control signal access terminal, another portion of the first switching devices of the plurality of first switching devices being connected to the positive voltage access terminal and the first control signal access terminal, respectively.
2. The power-off protection circuit of claim 1, further comprising a negative voltage discharge unit, the negative voltage discharge unit comprising:
the negative voltage access end is used for connecting a negative voltage output end of the main power supply circuit;
the second control signal access end is used for connecting the mark signal end;
a plurality of second switching devices, a portion of the plurality of second switching devices being connected to one of the negative voltage input and the second control signal input, another portion of the plurality of second switching devices being connected to the negative voltage input and the first control signal input, respectively.
3. The power failure protection circuit of claim 1, wherein the first switching device is a triode, the first switching device comprises three first NPN type triodes, the first NPN type triode and the first PNP type triode, the positive voltage discharging unit further comprises a first resistor module, a second resistor module, a third resistor module, a fourth resistor module and a voltage stabilizing diode, a first end of the first resistor module is connected to the first control signal input terminal, a second end of the first resistor module is connected to the base of the first NPN type triode, an emitter of the first NPN type triode is connected to the ground terminal, a collector of the first NPN type triode is connected to the first end of the second resistor module and the base of the second NPN type triode, respectively, a second end of the second resistor module is connected to the positive power source terminal, the emitting electrode of the second NPN type triode is connected with the grounding terminal, the collecting electrode of the second NPN type triode is respectively connected with the first end of the third resistor module and the base electrode of the first PNP type triode, the second end of the third resistor module is connected with the positive voltage access end, the emitting electrode of the first PNP type triode is connected with the first end of the fourth resistor module, the second end of the fourth resistor module is connected with the positive voltage access end, the collecting electrode of the first PNP type triode is connected with the negative electrode of the voltage stabilizing diode, and the positive electrode of the voltage stabilizing diode is connected with the grounding terminal.
4. The power failure protection circuit of claim 2, wherein the second switching device is a triode, the second switching device comprises two second PNP type triode, two third NPN type triode and one fourth NPN type triode, the negative voltage discharge unit further comprises a fifth resistor module, a sixth resistor module, a seventh resistor module and an eighth resistor module, a first end of the fifth resistor module is connected with the second control signal access terminal, a second end of the fifth resistor module is connected with an emitter of the second PNP type triode, a base of the second PNP type triode is connected with a first end of the sixth resistor module, a collector of the fourth NPN type triode and a ground terminal, a collector of the second PNP type triode is connected with a first end of the seventh resistor module and a base of the third NPN type triode respectively, the second end of the seventh resistor module is connected with the negative voltage access end, the emitter of the third NPN type triode is connected with the negative voltage access end, the collector of the third NPN type triode is connected with the second end of the sixth resistor module and the base of the fourth NPN type triode respectively, the emitter of the fourth NPN type triode is connected with the first end of the eighth resistor module, and the second end of the eighth resistor module is connected with the negative voltage access end.
5. The power-off protection circuit according to claim 1 or 3, wherein the voltage accessed by the positive voltage access terminal is one of the following: +16V, +12V, + 5V.
6. The power-off protection circuit of claim 2 or 4, wherein the voltage applied to the negative voltage input terminal is one of: -16V, -12V, -10V.
7. The outage protection circuit of claim 3, wherein the first resistance module comprises one or more first resistances, the second resistance module comprises one or more second resistances, the third resistance module comprises one or more third resistances, and the fourth resistance module comprises one or more fourth resistances.
8. The outage protection circuit of claim 4, wherein the fifth resistance module includes one or more fifth resistances, the sixth resistance module includes one or more sixth resistances, the seventh resistance module includes one or more seventh resistances, and the eighth resistance module includes one or more eighth resistances.
9. A power-down protection circuit according to claim 1 or claim 3, wherein the circuit network in which the positive voltage output is located comprises one or more inductive devices and one or more capacitive devices.
10. The circuit of claim 2 or 4, wherein the circuit network at which the negative voltage output is located comprises one or more inductive devices and one or more capacitive devices.
11. An electronic device comprising a main power supply circuit and a power-off protection circuit, the power-off protection circuit being as claimed in any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010670797.1A CN111786368A (en) | 2020-07-13 | 2020-07-13 | Power-off protection circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010670797.1A CN111786368A (en) | 2020-07-13 | 2020-07-13 | Power-off protection circuit and electronic equipment |
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| CN111786368A true CN111786368A (en) | 2020-10-16 |
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| CN202010670797.1A Pending CN111786368A (en) | 2020-07-13 | 2020-07-13 | Power-off protection circuit and electronic equipment |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202906457U (en) * | 2012-08-16 | 2013-04-24 | 惠州市德赛西威汽车电子有限公司 | Residual voltage discharge circuit |
| WO2015051688A1 (en) * | 2013-10-09 | 2015-04-16 | 珠海格力电器股份有限公司 | Protective circuit for input voltage of switch power source |
| CN106451392A (en) * | 2015-08-10 | 2017-02-22 | 佛山市顺德区美的电热电器制造有限公司 | Overvoltage protection apparatus of IGBT |
| CN106774772A (en) * | 2017-01-16 | 2017-05-31 | 郑州云海信息技术有限公司 | A kind of hot plug module electric supply installation, method and system |
| CN206321756U (en) * | 2016-12-14 | 2017-07-11 | 广州视源电子科技股份有限公司 | Power failure detection circuit and switching power supply circuit |
| CN210629442U (en) * | 2019-12-31 | 2020-05-26 | 成都极米科技股份有限公司 | Power switch device and electronic equipment |
-
2020
- 2020-07-13 CN CN202010670797.1A patent/CN111786368A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202906457U (en) * | 2012-08-16 | 2013-04-24 | 惠州市德赛西威汽车电子有限公司 | Residual voltage discharge circuit |
| WO2015051688A1 (en) * | 2013-10-09 | 2015-04-16 | 珠海格力电器股份有限公司 | Protective circuit for input voltage of switch power source |
| CN106451392A (en) * | 2015-08-10 | 2017-02-22 | 佛山市顺德区美的电热电器制造有限公司 | Overvoltage protection apparatus of IGBT |
| CN206321756U (en) * | 2016-12-14 | 2017-07-11 | 广州视源电子科技股份有限公司 | Power failure detection circuit and switching power supply circuit |
| CN106774772A (en) * | 2017-01-16 | 2017-05-31 | 郑州云海信息技术有限公司 | A kind of hot plug module electric supply installation, method and system |
| CN210629442U (en) * | 2019-12-31 | 2020-05-26 | 成都极米科技股份有限公司 | Power switch device and electronic equipment |
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Application publication date: 20201016 |