CN111342423B - Power supply hardware self-locking protection circuit - Google Patents
Power supply hardware self-locking protection circuit Download PDFInfo
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- CN111342423B CN111342423B CN202010265152.XA CN202010265152A CN111342423B CN 111342423 B CN111342423 B CN 111342423B CN 202010265152 A CN202010265152 A CN 202010265152A CN 111342423 B CN111342423 B CN 111342423B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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Abstract
The invention discloses a power supply hardware self-locking protection circuit, which comprises: the self-locking circuit comprises a power supply module, a current sampling module, a voltage comparator and a self-locking circuit, wherein the power supply module is used for providing a current signal; the current sampling module is used for sampling a current signal and indexing the current signal into a voltage signal; the voltage sampling module is used for sampling a voltage signal by adopting resistance voltage division to obtain time voltage; the voltage comparator is used for comparing the time voltage with a preset protection upper limit voltage and outputting a high level or a low level; the self-locking circuit is used for judging whether the output of the power supply module is normal or not according to the high level or the low level, and disconnecting the power supply module and latching signals if the output of the power supply module is abnormal. Therefore, compared with a software protection circuit, the protection circuit can effectively avoid the failure of the protection function caused by the Bug, has high protection response speed and can protect the load more effectively; and the self-locking circuit can avoid repetitive damage caused by long debugging period of the software system, and can effectively protect the load and the power supply.
Description
Technical Field
The invention relates to the technical field of power supply protection circuits, in particular to a power supply hardware self-locking protection circuit.
Background
In automatic production, automatic crimping is needed during product lighting test, when wrong Pin is electrified during automatic crimping, abnormal voltage and current are slow in power-off response, crimping abnormality is prone to occur, and therefore products are easily damaged when electrified, and products are easily damaged due to overcurrent.
As shown in fig. 1, the related art proposes a protection circuit for monitoring the MCU by scanning the output voltage, but the MCU occupies the MCU resources in a scanning manner, the response speed is slow, the protection will fail when the MCU resources are occupied, and the protection mechanism will fail when the MCU program has Bug.
Therefore, a protection circuit that does not occupy MCU resources and does not fail the protection mechanism due to some bugs is desired.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention aims to provide a power supply hardware self-locking protection circuit.
In order to achieve the above object, an embodiment of the present invention provides a power hardware self-locking protection circuit, including: the device comprises a power supply module, a current sampling module, a voltage comparator and a self-locking circuit, wherein the power supply module is used for providing a current signal; the current sampling module is used for sampling the current signal and transposing the current signal into a voltage signal; the voltage sampling module is used for sampling the voltage signal by adopting resistance voltage division to obtain time voltage; the voltage comparator is used for comparing the time voltage with a preset protection upper limit voltage and outputting a high level or a low level; the self-locking circuit is used for judging whether the output of the power supply module is normal or not according to the high level or the low level, and disconnecting the power supply module and latching a signal if the output of the power supply module is abnormal.
According to the power supply hardware self-locking protection circuit disclosed by the embodiment of the invention, the effect of reducing abnormal energy output is achieved by reducing the response time (namely the injury duration) of the power supply protection circuit, so that the problem of load or power supply damage caused by power supply abnormality is solved; still reach the outage state through design hardware auto-lock and keep the effect to solve because of no electric current after the hardware disconnection, voltage output leads to the system mistake and regards as unusual to get rid of, secondary damage that automatic output once more caused.
According to one embodiment of the invention, the power supply module is respectively connected with the current sampling module and the self-locking circuit, and the output voltage of the power supply module is connected with the load voltage; the current sampling module comprises a current sampling resistor, and the current sampling resistor is connected with the voltage sampling module; the voltage sampling module comprises a first voltage sampling resistor and a second voltage sampling resistor, the first voltage sampling resistor is connected with the current sampling resistor, and the second voltage sampling resistor is connected with a ground wire; the voltage comparator comprises a positive input end, a negative input end and an output end, wherein the negative input end is connected with the voltage sampling module, the positive input end is connected with the preset output voltage module, and the output end is connected with the self-locking circuit.
According to an embodiment of the present invention, in the voltage comparator, the positive input end inputs the preset protection upper limit voltage through software, the negative input end inputs the time voltage, when the preset protection upper limit voltage is greater than the time voltage, the output end outputs a high voltage, the power model outputs the high voltage normally, and when the preset protection upper limit voltage is less than the time voltage, the output end outputs a low voltage, the power model is disconnected.
According to an embodiment of the invention, the self-locking circuit comprises a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor.
According to an embodiment of the invention, the self-locking circuit includes a latching function and an unlocking function, when the output end of the voltage comparator outputs a low voltage, the power model is disconnected, and signals are latched through the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor.
According to one embodiment of the invention, after latching the signal, the power model is adjusted to reject the anomaly and to unlock the signal after rejection.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a MCU-based software power protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power hardware self-locking protection circuit according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
The following describes a power supply hardware self-locking protection circuit provided according to an embodiment of the invention with reference to the accompanying drawings.
Fig. 2 is a schematic structural diagram of a power hardware self-locking protection circuit according to an embodiment of the present invention. As shown in fig. 2, the power hardware self-locking protection circuit includes: the power supply module 100, the current sampling module 200, the voltage sampling module 300, the voltage comparator 400 and the self-locking circuit 500.
The power module 100 is configured to provide a current signal, and the power module 100 is suitable for a DC-DC power module (including LDO and switching power supply). The current sampling module 200 is used for sampling a current signal and transposing the current signal into a voltage signal, and can also protect a large current according to the circuit. The voltage sampling module 300 is configured to sample a voltage signal by using a resistor to divide a voltage, so as to obtain a time voltage.
The voltage comparator 400 is configured to compare the time voltage with a preset protection upper limit voltage, and output a high level or a low level.
Specifically, the voltage comparator 400 includes a positive input end 401, a negative input end 402, and an output end 403, where the positive input end 401 inputs a preset protection upper limit voltage through software, the negative input end 402 inputs a time voltage, when the preset protection upper limit voltage is greater than the time voltage, the output end 403 outputs a high voltage, and the power model outputs the high voltage normally, and when the preset protection upper limit voltage is less than the time voltage, the output end outputs a low voltage, and the power model is disconnected.
It should be noted that the preset output voltage module can set the upper protection limit through software output, so that the circuit is more flexible and has wider applicability.
The self-locking circuit 500 is used for judging whether the output of the power module is normal according to a high level or a low level, and disconnecting the power module and latching a signal if the output of the power module is abnormal.
Further, the self-locking circuit 500 mainly includes a first MOS transistor 501, a second MOS transistor 502, a third MOS transistor 503, and a fourth MOS transistor 504, and realizes signal latching through four MOS transistors with unlocking control, wherein the self-locking circuit 500 is simple and can be designed integrally, and can also be designed integrally with an operational amplifier as a chip, so that the self-locking circuit has a smaller volume and is more flexible in application.
Specifically, the connection relationship of the power supply hardware self-locking protection circuit in the embodiment of the invention is as follows: the power supply module 100 is respectively connected with the current sampling module 200 and the self-locking circuit 500, and the output voltage of the power supply module 100 is connected with the load voltage; the current sampling module 200 comprises a current sampling resistor 201, and the current sampling resistor 201 is connected with the voltage sampling module 300; the voltage sampling module 300 comprises a first voltage sampling resistor 301 and a second voltage sampling resistor 302, wherein the first voltage sampling resistor 301 is connected with the current sampling resistor 201, and the second voltage sampling resistor 302 is connected with the ground wire; the voltage comparator 400 includes a negative input terminal 402 connected to the voltage sampling module 300, a positive input terminal 401 connected to the preset output voltage module, and an output terminal 403 connected to the self-locking circuit 500.
Further, the implementation process of the power supply hardware self-locking protection circuit provided by the embodiment of the invention is as follows: the current collection module 200 collects a current signal provided by the DC-DC power supply module 100 by using a current collection resistor, and converts the current signal into a voltage signal, the voltage collection module 300 collects a voltage signal by using a voltage collection resistor, and obtains a time voltage, the negative input terminal of the voltage comparator inputs a time voltage, the positive input terminal of the voltage comparator inputs a preset protection upper limit voltage (when the protection current is output, the upper limit protection current is output for the current) through software, and determines whether the preset protection upper limit voltage is greater than the time voltage, if the preset protection upper limit voltage is greater than the time voltage, the output terminal of the voltage comparator outputs a high voltage, the power supply model normally outputs, if the preset protection upper limit voltage is less than the time voltage, the output terminal outputs a low voltage (abnormal power supply output), the power supply model is disconnected, the self-locking circuit latches the power supply switch signal through four MOS transistors, adjusts the current output by the power supply model, and compares the current again, and if the new time voltage is less than the preset protection upper limit voltage, namely abnormal locking is eliminated, and the abnormal locking is unlocked (the power supply switch signal is unlocked).
According to the power supply hardware self-locking protection circuit provided by the embodiment of the invention, the hardware monitoring response speed is high, the energy accumulation can be effectively avoided, and the damage of a load or a power supply element is avoided; MCU resources are not occupied, real-time response is realized, and reliability is improved; the circuit with self-locking function and unblock function avoids unusual secondary damage, uses more in a flexible way, need not cold-start, can relieve unusual locking state.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (4)
1. A power supply hardware self-locking protection circuit is characterized by comprising: a power supply module, a current sampling module, a voltage comparator and a self-locking circuit, wherein,
the power supply module is used for providing a current signal;
the current sampling module is used for sampling the current signal and indexing the current signal into a voltage signal;
the voltage sampling module is used for sampling the voltage signal by adopting resistance partial pressure to obtain time voltage;
the voltage comparator is used for comparing the time voltage with a preset protection upper limit voltage and outputting a high level or a low level;
the self-locking circuit is used for judging whether the output of the power supply module is normal or not according to the high level or the low level, and disconnecting the power supply module and latching a power supply switch signal if the output of the power supply module is not normal; the self-locking circuit comprises a latching function and an unlocking function, after the signal is latched, the power supply module is adjusted to eliminate the abnormality, and the power supply switch signal is unlocked after the abnormality is eliminated;
the self-locking circuit comprises a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube, wherein,
the first end of the first MOS tube is used for inputting an unlocking signal, the second end of the first MOS tube is grounded, and a resistor R7 is connected in parallel between the second end of the first MOS tube and the third end of the first MOS tube;
the first end of the second MOS tube is connected with the voltage comparator, the first end of the second MOS tube is also connected with a power supply Vdd through a resistor R4, the second end of the second MOS tube is connected with the third end of the first MOS tube, and the third end of the second MOS tube is connected with the power supply Vdd through a resistor R5;
the first end of the third MOS tube is connected with the power switch signal, the first end of the third MOS tube is also connected with the power supply Vdd through a resistor R6, the second end of the third MOS tube is connected with the third end of the first MOS tube, the third end of the third MOS tube is connected with the third end of the second MOS tube,
the first end of the fourth MOS tube is connected with the third end of the first MOS tube, the second end of the fourth MOS tube is grounded, and the third end of the fourth MOS tube is connected with the first end of the third MOS tube.
2. The power hardware self-locking protection circuit according to claim 1,
the power supply module is respectively connected with the current sampling module and the self-locking circuit, and the output voltage of the power supply module is connected with the load voltage;
the current sampling module comprises a current sampling resistor, and the current sampling resistor is connected with the voltage sampling module;
the voltage sampling module comprises a first voltage sampling resistor and a second voltage sampling resistor, the first voltage sampling resistor is connected with the current sampling resistor, and the second voltage sampling resistor is connected with a ground wire;
the voltage comparator comprises a positive input end, a negative input end and an output end, wherein the negative input end is connected with the voltage sampling module, the positive input end is connected with the preset output voltage module, and the output end is connected with the self-locking circuit.
3. The power hardware self-locking protection circuit according to claim 2,
in the voltage comparator, the positive input end inputs the preset protection upper limit voltage through software, the negative input end inputs the time voltage, when the preset protection upper limit voltage is greater than the time voltage, the output end outputs a high voltage, the power module outputs the high voltage normally, and when the preset protection upper limit voltage is less than the time voltage, the output end outputs a low voltage, the power module is disconnected.
4. The power hardware self-locking protection circuit according to claim 1, wherein when the output end of the voltage comparator outputs a low voltage, the power module is turned off, and a power switch signal is latched through the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010265152.XA CN111342423B (en) | 2020-04-07 | 2020-04-07 | Power supply hardware self-locking protection circuit |
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| CN202010265152.XA CN111342423B (en) | 2020-04-07 | 2020-04-07 | Power supply hardware self-locking protection circuit |
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| CN111342423B true CN111342423B (en) | 2023-03-03 |
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| CN112018738B (en) * | 2020-08-07 | 2022-06-07 | 中国北方发动机研究所(天津) | Sensor power supply interface circuit with overcurrent protection |
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