CN220527734U - Power-down-prevention backup power supply circuit for main control board - Google Patents
Power-down-prevention backup power supply circuit for main control board Download PDFInfo
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- CN220527734U CN220527734U CN202322163461.8U CN202322163461U CN220527734U CN 220527734 U CN220527734 U CN 220527734U CN 202322163461 U CN202322163461 U CN 202322163461U CN 220527734 U CN220527734 U CN 220527734U
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Abstract
The application discloses prevent power down backup power supply circuit to main control board, power supply circuit's input power is connected in the main control board, and power supply circuit includes: the power failure detection circuit, the control circuit, the buck-boost circuit and the super capacitor; the input end of the power failure detection circuit is connected between an input power supply and the main control board; the first voltage detection end of the control circuit is connected with the output end of the power-down detection circuit, the voltage control end of the control circuit is connected with the control end of the voltage boosting and reducing circuit, and the power-down feedback end of the control circuit is connected with the main control board; the first voltage input/output end of the buck-boost circuit is connected with the super capacitor, and the second voltage input/output end of the buck-boost circuit is connected with the main control board; the super capacitor is also connected to a second voltage detection end of the control circuit. Through the technical scheme in the application, the non-perception power supply switching during power supply of the backup power supply circuit is realized, and the stability of power supply of the backup power supply circuit is improved.
Description
Technical Field
The utility model relates to the field of design circuits, in particular to a standby power supply circuit.
Background
Aiming at the abnormal power-off condition of the main control board, in order to ensure that the main control board can stably work, a backup power supply is usually required to be arranged to provide short-time power supply for the main control board, and the main implementation mode is to supply power by adopting a capacitor circuit or independently configure a battery for power supply.
As disclosed in chinese patent CN216599111U, a boost-type backup power supply system based on super capacitor comprises a power supply circuit, a capacitor charging circuit, a super capacitor module, a power supply switching circuit and a boost circuit, when the system is powered normally, the power supply switching circuit opens a first path channel, closes a second path channel, and directly supplies power to a system load by a power supply, and simultaneously the capacitor charging circuit charges the super capacitor module, when the super capacitor module is charged to a rated value, the super capacitor module is closed, and does not participate in supplying power to the load. When the system is powered down or in an under-voltage state, the power supply switching circuit opens the second channel and closes the first channel, the super capacitor module directly supplies power to the system load through the second channel, and when the discharge voltage of the super capacitor is lower than a set threshold value, the second channel of the power supply switching circuit is closed and the booster circuit supplies power to the system load. The power supply time is prolonged, the data storage and protection operation are ensured, the maintenance cost is reduced, and the equipment reliability is improved.
In the prior art, on one hand, the conventional backup power supply circuit generally has the problems of low circuit efficiency and short power supply time, and the main control board cannot acquire the power-off state and hardly switches the power without sensing, so that the main control board cannot store the information in time when the power is off.
On the other hand, when using the super capacitor to supply power, the super capacitor generally has the decay to the power supply voltage when supplying power to the main control board, leads to main control board power supply voltage unstable, influences the normal use of main control board.
Disclosure of Invention
The technical problem to be solved by the application is as follows: how to realize the non-perception power supply switching when the backup power supply circuit supplies power and improve the stability of the backup power supply circuit.
To above-mentioned technical problem, this application provides a prevent power down backup power supply circuit to main control board, and power supply circuit's input power is connected in the main control board, and power supply circuit includes: the power failure detection circuit, the control circuit, the buck-boost circuit and the super capacitor; the input end of the power failure detection circuit is connected between an input power supply and the main control board; the first voltage detection end of the control circuit is connected with the output end of the power-down detection circuit, the voltage control end of the control circuit is connected with the control end of the voltage boosting and reducing circuit, and the power-down feedback end of the control circuit is connected with the main control board; the first voltage input/output end of the buck-boost circuit is connected with the super capacitor, and the second voltage input/output end of the buck-boost circuit is connected with the main control board; the super capacitor is also connected with a second voltage detection end of the control circuit; when the input power supply is powered off, the super capacitor supplies power to the main control board through the second voltage input/output end of the step-up and step-down circuit.
In some embodiments, the power supply circuit further comprises: an electronic switch; one end of the electronic switch is connected with the input power supply, the other end of the electronic switch is connected with the main control board, the other end of the electronic switch is also connected with the second voltage input/output end of the step-up circuit, the control end of the electronic switch is connected with the switch control end of the control circuit, and when the input power supply is powered off, the electronic switch is converted from a closed state to an open state.
In some embodiments, the power supply circuit further comprises: a resistor R3; the resistor R3 is arranged between the electronic switch and the main control board.
In some embodiments, the electronic switch is a MOS transistor, a drain electrode of the electronic switch is connected to the input power supply, and a gate electrode of the electronic switch is connected to a switch control end of the control circuit; the source electrode of the electronic switch is connected with the main control board.
In some embodiments, the power failure detection circuit includes two resistors R1 and R2 connected in series, a front end of the resistor R1 is connected to the input power supply, a tail end of the resistor R2 is grounded, and a first voltage detection end of the control circuit is connected between the resistor R1 and the resistor R2.
In some embodiments, the voltage control terminal of the control circuit includes a first voltage control terminal and a second voltage control terminal, and the buck-boost circuit includes: the MOS transistor Q2 and the MOS transistor Q3 are connected with the inductor; the grid electrode of the MOS tube Q2 is connected to the first voltage control end of the control circuit, the source electrode of the MOS tube Q2 is connected to the left end of the inductor, and the drain electrode of the MOS tube Q2 is connected to the main control board; the grid electrode of the MOS tube Q3 is connected to the second voltage control end of the control circuit, the source electrode of the MOS tube Q3 is grounded, and the drain electrode of the MOS tube Q3 is connected to the source electrode of the MOS tube Q2; the right end of the inductor is connected with the super capacitor through a resistor R4.
In some embodiments, the power supply circuit further comprises: a voltage division detection circuit; the voltage division detection circuit comprises two resistors R5 and R6 which are connected in series, the front end of the resistor R5 is connected with the connecting wire between the super capacitor and the resistor R4, and the tail end of the resistor R5 is connected with the front end of the resistor R6; the tail end of the resistor R6 is grounded; the second voltage detection end of the control circuit is connected between the resistor R5 and the resistor R6.
In the existing backup power supply method, if an original power supply system is powered off, a main control board cannot obtain the power-off state at all, and the non-perception power supply switching is difficult to achieve, and if super-capacitor power supply is used, stable power supply to the main control board is difficult to achieve. The problems described above are addressed. The utility model provides a prevent power down back-up power supply circuit to main control board to ask under the circumstances of former power supply system outage, realize incessantly stable power supply through super capacitor, and report the technological effect of outage information when the outage.
The technical scheme has the following advantages and beneficial effects:
1. the utility model provides a prevent power down back-up power supply circuit to main control board, through detection circuitry, electronic switch, super capacitor, step-up and down circuit have formed an uninterrupted back-up power supply system, through this power supply system, can supply power for the main control board to provide short-term back-up ability, and the step-up and down circuit of this application design can charge for super capacitor, also can switch into super capacitor discharge at outage mode.
2. The utility model provides a prevent power down back-up power supply circuit to main control board, in the moment that input power stops supplying power, control circuit will give the main control board with outage feedback signal to uninterrupted power supply is not cut off power supply during the switching back-up power supply of outage, and the main control board does not cut off power supply, so as to ensure that the main control board knows current for the back-up power supply mode, provides sufficient time support for main control board save important information.
3. The utility model provides a prevent power down back-up power supply circuit to main control board, divide into normal power supply mode and power down back-up mode: in a normal power supply mode state, one path of an input power supply supplies power to the main control board to ensure that the main control board works normally, and the other path of the input power supply charges the super capacitor by storing energy after passing through the step-up and step-down circuit; in the power-down backup mode state, after receiving the power-down signal fed back by the power-down detection circuit, the control circuit sends a power-down feedback signal to the main control board so as to ensure that the main control board can perform power-down operation; meanwhile, the control circuit can further control the super capacitor to stably supply power to the main control board by controlling the buck-boost circuit.
4. The switching of the input power supply and the super capacitor power supply of this application design is the millisecond level, and the switching in-process, main control board can not stop working because of the input power supply loses the power, and whole back-up power supply process is the uninterrupted state of power, only cuts off power supply feedback signal and send to the main control board.
The foregoing description is only a summary of the technical solutions of the present application, so that the technical means of the present application may be implemented according to the content of the specification, and so that the foregoing and other objects, features and advantages of the present application may be more clearly understood, the following detailed description of the preferred embodiments of the present application is given in conjunction with the accompanying drawings.
The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of the specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a power-down prevention backup power circuit for a main control board according to the present utility model;
FIG. 2 is a partial circuit diagram of a power-down prevention backup power supply circuit for a main control board according to the present utility model;
reference numerals: 1. inputting a power supply; 2. an electronic switch; 3. a power-down detection circuit; 4. a control circuit; 5. a step-up/step-down circuit; 6. a super capacitor; 7. and a main control board.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to facilitate a thorough understanding of embodiments of the present application. It will therefore be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the application. In addition, descriptions of well-known functions and constructions are omitted in the embodiments for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "the present embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the "one embodiment" or "this embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: the terms "/and" herein describe another associative object relationship, indicating that there may be two relationships, e.g., a/and B, may indicate that: the character "/" herein generally indicates that the associated object is an "or" relationship.
The term "at least one" is herein merely an association relation describing an associated object, meaning that there may be three kinds of relations, e.g., at least one of a and B may represent: a exists alone, A and B exist together, and B exists alone.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprise," "include," or any other variation thereof, are intended to cover a non-exclusive inclusion.
Referring to fig. 1, an input power source 1 of a power supply circuit is connected to a main control board 7, and the power supply circuit includes: the power failure detection circuit 3, the control circuit 4, the step-up and step-down circuit 5 and the super capacitor 6; the input end of the power failure detection circuit 3 is connected between the input power supply 1 and the main control board 7; the first voltage detection end of the control circuit 4 is connected with the output end of the power failure detection circuit, the voltage control end of the control circuit 4 is connected with the control end of the step-up and step-down circuit 5, and the power failure feedback end of the control circuit 4 is connected with the main control board 7; the first voltage input/output end of the buck-boost circuit 5 is connected with the super capacitor 6, and the second voltage input/output end of the buck-boost circuit 5 is connected with the main control board 7; the super capacitor 6 is also connected to a second voltage detection end of the control circuit 4; when the original power supply system is powered off, the super capacitor 6 can give the control circuit 4 super capacitor voltage; when the input power supply 1 is powered off, the super capacitor 6 supplies power to the main control board 7 through the second voltage input/output end of the step-up and step-down circuit 5.
In this embodiment, when the input power source 1 stops supplying power, the power-off signal sent by the power-off detection circuit 3 is transmitted to the control circuit 4 through a circuit; the control circuit 4 sends a power-off feedback signal to the main control board 7, and the main control board 7 stores current data; and the control circuit 4 switches the power supply mode of the main control board 7 into the power supply mode of the super capacitor 6 and the step-up and step-down circuit 5, so that the main control board 7 is continuously powered during the power failure period of the input power supply 1, the main control board 7 is continuously powered off, and enough time support is provided for the main control board 7 to store important information.
Meanwhile, in this embodiment, the phenomenon that the super capacitor 6 attenuates in power supply voltage along with the length of the power supply time when the super capacitor 6 is simply used for power supply is considered. Therefore, in this embodiment, the step-up/down circuit 5 is provided to charge the super capacitor 6 when the input power source 1 supplies power normally; when the input power supply 1 (abnormal) is powered off, the output voltage of the super capacitor 6 is boosted, so that the attenuation phenomenon that the super capacitor 6 supplies power to the main control board 7 is eliminated, and the stability of the power supply of the backup power supply circuit in the embodiment is improved.
In some embodiments, to avoid circuit failure caused by current flowing back to the input power source 1, the power failure detection circuit 3, the control circuit 4, etc. when the super capacitor 6 supplies power, the power circuit further includes: an electronic switch 2; one end of the electronic switch 2 is connected with the input power supply 1, the other end of the electronic switch 2 is connected with the main control board 7, the other end of the electronic switch 2 is also connected with the second voltage input/output end of the step-up/step-down circuit 5, and the control end of the electronic switch 2 is connected with the switch control end of the control circuit 4; when the input power supply 1 is powered off, the electronic switch 2 is switched from a closed state to an open state.
Referring to fig. 2, in order to increase the response rate of the electronic switch 2, the electronic switch 2 in the embodiment is a MOS transistor, the drain electrode of the electronic switch 2 is connected to the input power source 1, and the gate electrode of the electronic switch 2 is connected to the switch control end of the control circuit 4; the source electrode of the electronic switch 2 is connected with the main control board 7.
In this embodiment, the electronic switch 2 is controlled to be turned on or off by a power supply path control signal sent by the control circuit 4, when the input power supply 1 supplies power normally, the current output by the input power supply 1 is divided into two paths after passing through the electronic switch 2, one path directly supplies power to the main control board 7, and the other path of current charges the super capacitor 6 after passing through the step-up and step-down circuit 5; when the input power supply 1 stops supplying power, the electronic switch 2 is switched from a closed state to an open state and is switched to a standby power supply (super capacitor 6) power supply mode.
In some embodiments, the power supply circuit further comprises: a resistor R3; the resistor R3 is arranged between the electronic switch 2 and the main control board 7 and is used for protecting the electronic switch 2 and preventing the electronic switch 2 from being broken down reversely.
In some embodiments, the power failure detection circuit 3 includes two resistors R1 and R2 connected in series, the front end of the resistor R1 is connected to the input power source 1, the tail end of the resistor R2 is grounded, and the first voltage detection end of the control circuit 4 is connected between the resistor R1 and the resistor R2.
In this embodiment, when the input power source 1 is powered down, the voltage value of the voltage dividing resistor R2 is 0, and is used as a power-off signal to the control circuit 4, the control circuit 4 sends a power-off feedback signal to the main control board 7, and the main control board 7 can perform power-off operation according to a preset corresponding configuration, such as saving important information, and the like, and meanwhile, the control circuit 4 also controls the electronic switch 2 to switch from a closed state to an open state, and controls the voltage boosting and reducing circuit 5 to boost the output voltage of the super capacitor 6, and supply power to the main control board 7.
In some embodiments, the voltage control terminals of the control circuit 4 include a first voltage control terminal and a second voltage control terminal, and the step-up/step-down circuit 5 includes: the MOS transistor Q2 and the MOS transistor Q3 are connected with the inductor; the grid electrode of the MOS tube Q2 is connected to the first voltage control end of the control circuit 4, the source electrode of the MOS tube Q2 is connected to the left end of the inductor, and the drain electrode of the MOS tube Q2 is connected to the main control board 7; the grid electrode of the MOS tube Q3 is connected to the second voltage control end of the control circuit 4, the source electrode of the MOS tube Q3 is grounded, and the drain electrode of the MOS tube Q3 is connected to the source electrode of the MOS tube Q2; the synchronous rectification Boost circuit composed of the MOS tube Q2, the MOS tube Q3 and the inductor L can realize the power supply of the main control board 7 by adjusting the on-off of the two MOS tubes by the control circuit 4. The right end of the inductor is connected to the super capacitor 6 through a resistor R4 and used for preventing excessive surge current at the moment of power-on, and the other end of the super capacitor 6 is grounded.
In this embodiment, when the input power supply 1 works normally, the MOS transistor Q3 is kept turned off, and the control circuit 4 sends a PWM control signal to the MOS transistor Q2 to control the MOS transistor Q2 to periodically switch the on-off state, so as to charge the super capacitor 6 with low voltage. Meanwhile, the control circuit 4 detects the super capacitor voltage according to the voltage division detection circuit formed by the resistor R5 and the resistor R6, if the super capacitor voltage is full, the control circuit 4 controls the voltage increasing and decreasing circuit 5 to be disconnected, namely the Q2 is kept to be turned off.
When the input power supply 1 is powered down, the control circuit 4 controls the step-up and step-down circuit 5, the MOS tube Q2, the MOS tube Q3 and the inductor L form a synchronous rectification Boost circuit, so that the current of the super capacitor 6 supplies power to the main control board 7 through the circuit 5, and the control circuit 4 controls the on-off duty ratio of the MOS tube Q2 and the MOS tube Q3 respectively, namely the conduction duty ratio of the MOS tube Q2 is larger in the initial stage, the conduction duty ratio of the MOS tube Q3 is smaller, and the voltage of the super capacitor 6 is not attenuated at the moment; when the voltage of the super capacitor 6 decays, the conduction duty ratio of the MOS tube Q2 is reduced, the conduction duty ratio of the MOS tube Q3 is increased, and the super elevator 6 continues to stably supply power to the main control board 7 by utilizing the energy storage effect of the inductor L, so that the power supply voltage decay caused by the discharge of the super capacitor 6 is avoided.
In some embodiments, the power supply circuit further comprises: a voltage division detection circuit; the voltage division detection circuit comprises two resistors R5 and R6 which are connected in series, the front end of the resistor R5 is connected with the connecting wire between the super capacitor 6 and the resistor R4, and the tail end of the resistor R5 is connected with the front end of the resistor R6; the tail end of the resistor R6 is grounded; the second voltage detection end of the control circuit 4 is connected between the resistor R5 and the resistor R6. In this embodiment, the control circuit 4 makes a judgment by detecting the voltage state of the voltage division detection circuit, and further controls the turn-off of the step-up/down circuit 5.
According to the power-down-prevention backup power supply circuit for the main control board, an uninterrupted backup power supply system is formed through the detection circuit, the electronic switch, the super capacitor and the buck-boost circuit, the main control board can be powered through the power supply system, short-time backup capacity is provided, and the buck-boost circuit disclosed by the embodiment can charge the super capacitor and can be switched into super capacitor discharge in a power-off mode.
Two operation modes of the power-down prevention backup power circuit in this embodiment: a normal power mode state and a power-down backup mode state.
Normal power mode:
as shown in fig. 2, when the input power supply 1 works normally, voltages are applied to two voltage dividing resistors R1 and R2 in the power failure detection circuit 3, the voltage value of R2 is used as a signal for normal power supply of the input power supply 1, the power failure detection circuit 3 detects the state of the input power supply 1, when the input power supply 1 is normal, that is, the input power supply 1 is powered on at any time, a power failure signal is not triggered, at this moment, the control circuit 4 sends a power path control signal to enable the electronic switch 2 to be turned on, the input power supply 1 supplies power to the main control board 7, and the main control board 7 obtains the power to start normal work.
After passing through the electronic switch 2, another current input into the power supply 1 is charged by passing through the step-up and step-down circuit 5 to the super capacitor 6.
At this time, the MOS transistor Q3 is kept off, and the control circuit 4 sends a PWM control signal to the MOS transistor Q2 to control the MOS transistor Q2 to periodically switch the on-off state, so as to realize low-voltage charging to the super capacitor 6.
Meanwhile, the control circuit 4 detects the super capacitor voltage according to the voltage division detection circuit formed by the resistor R5 and the resistor R6, if the super capacitor voltage is full, the control circuit 4 controls the voltage increasing and decreasing circuit 5 to be disconnected, namely the Q2 is kept to be turned off.
Power down backup mode:
when the input power supply 1 is powered down, the voltage value of the voltage dividing resistor R2 is 0, and is used as a power-off signal to the control circuit 4, the control circuit 4 sends a power-off feedback signal to the main control board 7, and the main control board 7 can perform power-off process operation according to preset corresponding configuration, such as saving important information and the like.
Meanwhile, the control circuit 4 controls the buck-Boost circuit 5, the MOS tube Q2, the MOS tube Q3 and the inductor L form a synchronous rectification Boost circuit, so that the current of the super capacitor 6 supplies power to the main control board 7 through the circuit 5, and the control circuit 4 respectively adjusts the on-off duty ratio of the MOS tube Q2 and the MOS tube Q3, namely the conduction duty ratio of the MOS tube Q2 is larger in the initial stage, the conduction duty ratio of the MOS tube Q3 is smaller, and the voltage of the super capacitor 6 is not attenuated at the moment; when the voltage of the super capacitor 6 decays, the conduction duty ratio of the MOS tube Q2 is reduced, the conduction duty ratio of the MOS tube Q3 is increased, and the super elevator 6 continues to stably supply power to the main control board 7 by utilizing the energy storage effect of the inductor L, so that the power supply voltage decay caused by the discharge of the super capacitor 6 is avoided.
It should be noted that, the on-off of the MOS transistor Q2 and the MOS transistor Q3 are controlled separately, and the specific control manner is not described again.
The switching is in millisecond level, the main control board 7 does not stop working because the input power supply 1 is powered down, the whole standby power supply process is in a power supply uninterrupted state, and only a power-off feedback signal is sent to the main control board 7.
According to the power-down prevention backup power supply circuit for the main control board, disclosed by the embodiment, at the moment that the input power supply stops supplying power, the control circuit can send a power-down feedback signal to the main control board, and the power-down is continuously supplied during the period of switching the backup power supply, so that the main control board is ensured to know the current power supply mode for the backup power supply, and enough time support is provided for the main control board to save important information.
In the switching process, the main control board does not stop working due to power failure of the input power supply, and the whole backup power supply process is in a power uninterrupted state, and only a power-off feedback signal is sent to the main control board.
It is to be understood that the above-described embodiments of the present application are merely illustrative of or explanation of the principles of the present application and are in no way limiting of the present application. Accordingly, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present application are intended to be included within the scope of the present application. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (7)
1. Anti-power-down backup power supply circuit for a main control board, wherein an input power supply (1) of the power supply circuit is connected to the main control board (7), and the anti-power-down backup power supply circuit is characterized by comprising: the power failure detection circuit (3), the control circuit (4), the step-up and step-down circuit (5) and the super capacitor (6);
the input end of the power failure detection circuit (3) is connected between the input power supply (1) and the main control board (7);
the first voltage detection end of the control circuit (4) is connected with the output end of the power failure detection circuit, the voltage control end of the control circuit (4) is connected with the control end of the step-up/step-down circuit (5), and the power failure feedback end of the control circuit (4) is connected with the main control board (7);
the first voltage input/output end of the step-up/step-down circuit (5) is connected with the super capacitor (6), and the second voltage input/output end of the step-up/step-down circuit (5) is connected with the main control board (7);
the super capacitor (6) is also connected to a second voltage detection end of the control circuit (4);
when the input power supply (1) is powered off, the super capacitor (6) supplies power to the main control board (7) through the second voltage input/output end of the step-up/step-down circuit (5).
2. The power down prevention backup power circuit for a main control board of claim 1, further comprising: an electronic switch (2);
one end of the electronic switch (2) is connected with the input power supply (1),
the other end of the electronic switch (2) is connected with the main control board (7), the other end of the electronic switch (2) is also connected with the second voltage input/output end of the step-up and step-down circuit (5),
the control end of the electronic switch (2) is connected with the switch control end of the control circuit (4),
when the input power supply (1) is powered off, the electronic switch (2) is switched from a closed state to an open state.
3. The power down prevention backup power circuit for a main control board of claim 2, further comprising: a resistor R3;
the resistor R3 is arranged between the electronic switch (2) and the main control board (7).
4. The power-down prevention backup power supply circuit for the main control board according to claim 2, wherein the electronic switch (2) is a MOS transistor, a drain electrode of the electronic switch (2) is connected to the input power supply (1), and a gate electrode of the electronic switch (2) is connected to the switch control end of the control circuit (4); the source electrode of the electronic switch (2) is connected with the main control board (7).
5. The power-down prevention backup power supply circuit for a main control board according to any one of claims 1 to 4, wherein the power-down detection circuit (3) comprises two resistors R1 and R2 connected in series, the front end of the resistor R1 is connected to an input power supply (1), the tail end of the resistor R2 is grounded, and the first voltage detection end of the control circuit (4) is connected between the resistor R1 and the resistor R2.
6. The power-down prevention backup power supply circuit for a main control board according to claim 1, wherein the voltage control terminal of the control circuit (4) includes a first voltage control terminal and a second voltage control terminal, and the step-up/step-down circuit (5) includes: the MOS transistor Q2 and the MOS transistor Q3 are connected with the inductor;
the grid electrode of the MOS tube Q2 is connected to the first voltage control end of the control circuit (4), the source electrode of the MOS tube Q2 is connected to the left end of the inductor, and the drain electrode of the MOS tube Q2 is connected to the main control board (7);
the grid electrode of the MOS tube Q3 is connected to the second voltage control end of the control circuit (4), the source electrode of the MOS tube Q3 is grounded, and the drain electrode of the MOS tube Q3 is connected to the source electrode of the MOS tube Q2;
the right end of the inductor is connected with the super capacitor (6) through a resistor R4.
7. The power down prevention backup power circuit for a main control board of claim 6, further comprising: a voltage division detection circuit;
the voltage division detection circuit comprises two resistors R5 and R6 which are connected in series, the front end of the resistor R5 is connected with the super capacitor (6) and a connecting wire in the middle of the resistor R4, and the tail end of the resistor R5 is connected with the front end of the resistor R6;
the tail end of the resistor R6 is grounded;
the second voltage detection end of the control circuit (4) is connected between the resistor R5 and the resistor R6.
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| CN202322163461.8U CN220527734U (en) | 2023-08-11 | 2023-08-11 | Power-down-prevention backup power supply circuit for main control board |
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| CN202322163461.8U CN220527734U (en) | 2023-08-11 | 2023-08-11 | Power-down-prevention backup power supply circuit for main control board |
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