CN213484578U - Power-down protection device - Google Patents
Power-down protection device Download PDFInfo
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- CN213484578U CN213484578U CN202022539792.3U CN202022539792U CN213484578U CN 213484578 U CN213484578 U CN 213484578U CN 202022539792 U CN202022539792 U CN 202022539792U CN 213484578 U CN213484578 U CN 213484578U
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Abstract
The utility model provides a power-down protection device, which comprises a main controller, a power-down detection unit, an energy storage unit, a switch unit and a battery unit; the input end of the energy storage unit is electrically connected with the main power supply, and the output end of the energy storage unit is electrically connected with the power supply input end of the main controller; the detection end of the power failure detection unit is electrically connected with a main power supply, the signal sending end of the power failure detection unit is connected with the signal receiving end of the main controller, and when the voltage of the main power supply is lower than a first preset voltage, the power failure detection unit sends a power failure protection signal to the main controller; the battery unit comprises an auxiliary battery, the anode of the auxiliary battery is electrically connected with the input end of the switch unit, and the cathode of the auxiliary battery is grounded; the output end of the switch unit is electrically connected with the input end of the energy storage unit, the control signal receiving end of the switch unit is electrically connected with the control signal sending end of the main controller, when the main controller receives a power failure protection signal, the main controller sends a control signal to enable the switch unit to be conducted, and the auxiliary battery supplies power.
Description
Technical Field
The utility model relates to a power-off protection technical field, in particular to power-down protection device.
Background
Due to the reasons of practicality or appearance design and the like, many electronic devices do not set a power-off key on a control module, but are turned on and off through manual operation. For example, a vending machine is usually turned on or off only by plugging and unplugging a power cord; for the vehicle-mounted robot, a key is usually used to start and close a vehicle power supply circuit, so as to turn on and off the vehicle-mounted robot. If the external power supply or the power supply circuit is suddenly powered off, the damage of an operating system or the loss of key data information such as current transaction information and the like can be caused with a high probability; when the emergency occurs too frequently, the subsequent homing measures cannot be executed, and even the damage of an integrated circuit chip or equipment is caused.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that the control module in order to overcome many electronic equipment among the prior art does not dispose the key of shutting down, if the condition of the sudden power failure appears can lead to operating system to damage, key data to lose, unable playback or the defect of the damage of chip, equipment, provides a power down protection device.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the utility model provides a power-down protection device, which comprises a main controller, a power-down detection unit, an energy storage unit, a switch unit and a battery unit;
the input end of the energy storage unit is electrically connected with a main power supply, and the output end of the energy storage unit is electrically connected with the power supply input end of the main controller;
the detection end of the power failure detection unit is electrically connected with the main power supply, the signal sending end of the power failure detection unit is connected with the signal receiving end of the main controller, and when the voltage of the main power supply is lower than a first preset voltage, the power failure detection unit sends a power failure protection signal to the main controller;
the battery unit comprises an auxiliary battery, the anode of the auxiliary battery is electrically connected with the input end of the switch unit, and the cathode of the auxiliary battery is grounded;
the output end of the switch unit is electrically connected with the input end of the energy storage unit, the control signal receiving end of the switch unit is electrically connected with the control signal sending end of the main controller, when the main controller receives the power failure protection signal, the main controller sends a control signal to enable the switch unit to be switched on, and the auxiliary battery supplies power through the switch unit.
Preferably, the power failure protection device further comprises a rectifying circuit, an input end of the rectifying circuit is electrically connected with the main power supply, an output end of the rectifying circuit is electrically connected with an input end of the energy storage unit and a detection end of the power failure detection unit, and the rectifying circuit is used for converting alternating current into direct current with a second preset voltage when the main power supply is alternating current.
Preferably, the power failure detection unit includes a first load resistor and a second load resistor connected in series, one end of the first load resistor is electrically connected to the detection end, the other end of the first load resistor is electrically connected to one end of the second load resistor and the signal transmission end, and the other end of the second load resistor is grounded.
Preferably, the first load resistor and the second load resistor have the same resistance value, and the resistance value is greater than 0.008 ohm (Ω) and less than 0.012 Ω.
Preferably, the energy storage unit includes a plurality of capacitors connected in parallel, an anode of each capacitor is electrically connected to the input end of the energy storage unit and the output end of the energy storage unit, and a cathode of each capacitor is grounded.
Preferably, the main controller controls the discharge of the secondary battery through the switch unit, and when the main controller is turned off, the main controller stops sending the control signal, and the switch unit is automatically turned off.
Preferably, the power-down protection device further includes a battery capacity detection circuit, one end of the battery capacity detection circuit is electrically connected to the input terminal of the switch unit and the first voltage detection pin of the main controller, the other end of the battery capacity detection circuit is electrically connected to the anode of the secondary battery and the second voltage detection pin of the main controller, and the battery capacity detection circuit is configured to send the voltage value of the secondary battery to the main controller.
Preferably, the secondary battery is a storage battery, an output end of the switch unit is electrically connected to the main power supply, and when the voltage of the secondary battery is lower than a third preset voltage and the voltage of the main power supply is higher than a first preset voltage, the main controller configures the control signal sending end in a Pulse Width Modulation (PWM) mode, so that the secondary battery is charged; the third preset voltage is lower than the first preset voltage.
Preferably, the switching unit includes a first P-channel metal-oxide semiconductor field effect (PMOS) transistor, a second PMOS transistor, an NPN transistor, a third load resistor, a fourth load resistor, and a fifth load resistor;
the drain electrode of the second PMOS transistor is electrically connected with the output end of the switch unit, and the source electrode of the second PMOS transistor is electrically connected with the source electrode of the first PMOS transistor;
the drain electrode of the first PMOS transistor is electrically connected with the input end of the switch unit;
the grid electrode of the first PMOS transistor and the grid electrode of the second PMOS transistor are electrically connected with the collector electrode of the NPN type triode;
one end of the third load resistor is electrically connected with the grid electrode of the first PMOS transistor and the grid electrode of the second PMOS transistor, and the other end of the third load resistor is electrically connected with the source electrode of the first PMOS transistor and the source electrode of the second PMOS transistor;
the emitting electrode of the NPN type triode is grounded;
the base electrode of the NPN type triode is electrically connected with one end of the fourth load resistor;
the other end of the fourth load resistor is electrically connected with one end of the fifth load resistor and the control signal receiving end;
the other end of the fifth load resistor is grounded.
Preferably, the main power supply and the power failure detection unit are electrically connected with the energy storage unit and the switch unit through diodes;
the power failure detection device comprises a main power supply, a power failure detection unit, an energy storage unit, a switch unit and a switch unit, wherein the main power supply and the detection end of the power failure detection unit are electrically connected with the positive electrode of a diode, and the input end of the energy storage unit and the output end of the switch unit are electrically connected with the negative electrode of the diode.
The utility model discloses an actively advance the effect and lie in:
the utility model provides a power down protection device, fall the electricity suddenly when the main power supply, main control unit can not lose the power and shut down at once, power down protection device can trigger the soft flow of shutting down, main control unit shuts down the processing according to the lower electric current journey of formal, the mechanical equipment initiative that has guaranteed all operations resets, key data information uploads the high in the clouds backup, main control unit reruns self microsystem power off flow afterwards, guarantee integrated circuit chip's stability, prevent that chip, operating system or equipment from causing the harm because of falling the electricity suddenly. The power-down protection device also strengthens the control and maintenance of the secondary battery, and in order to reduce the consumption of the electric quantity of the secondary battery, the main controller can actively reduce the unnecessary load consumption; after the system is safely shut down, the power supply circuit is automatically disconnected, and the auxiliary battery is prevented from entering an over-discharge state; and meanwhile, a sampling detection resistor and a pin with a PWM function are added, when the main power supply is in place and the main controller detects that the electric quantity of the battery is too low, the auxiliary battery is charged to ensure that the auxiliary battery is always in a charged state.
Drawings
Fig. 1 is the structure diagram of an embodiment of the power down protection device of the present invention.
Fig. 2 is another schematic structural diagram of an embodiment of the power down protection device of the present invention.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
As shown in fig. 1-2, the present embodiment provides a power failure protection device, which includes a main controller 1, a power failure detection unit 2, an energy storage unit 3, a switch unit 4, and a battery unit 5;
the input end of the energy storage unit 3 is electrically connected with a main power supply, and the output end of the energy storage unit 3 is electrically connected with the power supply input end of the main controller 1; specifically, the main power supply is a direct current power supply, the output end of the energy storage unit 3 is VBAT, and direct current is output to the power supply input end of the main controller 1;
the detection end of the power failure detection unit 2 is electrically connected with a main power supply, the signal sending end of the power failure detection unit 2 is connected with the signal receiving end of the main controller 1, and when the voltage of the main power supply is lower than a first preset voltage, the power failure detection unit 2 sends a power failure protection signal to the main controller 1; specifically, the signal receiving terminal of the main controller 1 is a GPIO _2 pin of the main controller 1, and when the voltage of the main power supply is lower than a first preset voltage, the GPIO _2 pin becomes a low level.
The battery unit 5 comprises a secondary battery 6, the anode of the secondary battery 6 is electrically connected with the input end of the switch unit 4, and the cathode of the secondary battery 6 is grounded;
the output end of the switch unit 4 is electrically connected with the input end of the energy storage unit 3, the control signal receiving end of the switch unit 4 is electrically connected with the control signal sending end of the main controller 1, when the main controller 1 receives a power failure protection signal, the main controller 1 sends a control signal to enable the switch unit 4 to be conducted, and the auxiliary battery 6 supplies power through the switch unit 4. Specifically, the control signal sending end of the main controller 1 is a GPIO _1 pin of the main controller 1.
Preferably, the power failure protection device further comprises a rectifying circuit 7, an input end of the rectifying circuit 7 is electrically connected with a main power supply, an output end of the rectifying circuit is electrically connected with an input end of the energy storage unit 3 and a detection end of the power failure detection unit 2, and the rectifying circuit is used for converting alternating current into direct current with second preset voltage when the main power supply is alternating current. Specifically, the second preset voltage is 4 volts (V).
Preferably, the power down detection unit 2 includes a first load resistor R1 and a second load resistor R2 connected in series, one end of the first load resistor R1 is electrically connected to the detection terminal, the other end is electrically connected to one end of the second load resistor R2 and the signal transmission terminal, and the other end of the second load resistor is grounded. The first load resistor and the second load resistor have the same resistance value, and the resistance value is larger than 0.008 Ω and smaller than 0.012 Ω. Specifically, the first load resistor R1 and the second load resistor R2 are 0.01 Ω. The signal receiving end of the main controller 1 is a pin GPIO _2 of the main controller 1.
Preferably, the energy storage unit 3 includes a plurality of capacitors connected in parallel, an anode of each capacitor is electrically connected to the input terminal of the energy storage unit 3 and the output terminal of the energy storage unit 3, and a cathode of each capacitor is grounded. Specifically, the capacitance C1 is 100 microfarads (μ F), the capacitance C2 is 47 μ F, the capacitance C3 is 100 μ F, and the capacitance C4 is 33 pF.
Preferably, the main controller 1 controls the discharge of the sub-battery 6 through the switch unit 4, and when the main controller 1 is turned off, the main controller 1 stops sending the control signal, and the switch unit 4 is automatically turned off.
Preferably, the power-down protection device further includes a battery power detection circuit 8, one end of the battery power detection circuit 8 is electrically connected to the input terminal of the switch unit 4 and the first voltage detection pin SNS _ M of the main controller 1, the other end of the battery power detection circuit 8 is electrically connected to the positive electrode of the secondary battery 6 and the second voltage detection pin SNS _ P of the main controller 1, and the battery power detection circuit 8 is configured to send the voltage value of the secondary battery to the main controller 1. Specifically, the battery level detection circuit 8 includes a load resistor R6, and the load resistor R6 is 0.01 Ω.
Preferably, the secondary battery 6 is a storage battery, the output end of the switch unit 4 is electrically connected with the main power supply, and when the voltage of the secondary battery 6 is lower than a third preset voltage and the voltage of the main power supply is higher than a first preset voltage, the main controller 1 configures the control signal transmitting end into a PWM mode to charge the secondary battery; the third preset voltage is lower than the first preset voltage. Specifically, the control signal sending end of the main controller 1 is a GPIO _1 pin of the main controller 1.
Preferably, the switching unit 4 includes a first PMOS transistor Q1, a second PMOS transistor Q2, an NPN transistor Q3, a third load resistor R3, a fourth load resistor R4, and a fifth load resistor R5;
the drain of the second PMOS transistor Q2 is electrically connected to the output terminal of the switching unit 4, and the source of the second PMOS transistor Q2 is electrically connected to the source of the first PMOS transistor Q1;
the drain of the first PMOS transistor Q1 is electrically connected to the input terminal of the switching unit 4;
the gate of the first PMOS transistor Q1 and the gate of the second PMOS transistor Q2 are electrically connected to the collector of the NPN transistor Q3;
one end of the third load resistor R3 is electrically connected to the gate of the first PMOS transistor Q1 and the gate of the second PMOS transistor Q2, and the other end is electrically connected to the source of the first PMOS transistor Q1 and the source of the second PMOS transistor Q2;
the emitter of the NPN type triode Q3 is grounded;
the base electrode of the NPN type triode Q3 is electrically connected with one end of the fourth load resistor R4;
the other end of the fourth load resistor R4 is electrically connected with one end of the fifth load resistor R5 and a control signal receiving end;
the other end of the fifth load resistor R5 is grounded.
Specifically, the third load resistor R3 is 10K Ω, the fourth load resistor R4 is 1K Ω, and the fifth load resistor R5 is 51K Ω.
The working principle of the switching circuit is as follows:
when the main power supply is powered off, the pin GPIO _2 of the main controller 1 can be changed into low level. After the main controller 1 detects that the main power supply is powered off, the main controller 1 can disconnect unnecessary peripheral loads, so that the power consumption of the auxiliary battery 6 is reduced, and the capacity of the auxiliary battery 6 is ensured. Meanwhile, the main controller 1 pulls up the GPIO _1 pin, the switch unit 4 is switched on, and the auxiliary battery 6 supplies power through the switch unit 4. The main controller 1 processes important information and resets devices such as a mechanical structure. And finally, powering off the main controller 1 according to a preset sequence to ensure normal shutdown.
When the main controller 1 is powered off, the pin GPIO _1 of the main controller 1 changes to low level. Due to the pull-down resistor R5, the base of the NPN transistor Q3 becomes low, the first PMOS transistor Q1 and the second PMOS transistor Q2 are in an off state, and the switching unit 4 is no longer turned on, thereby disconnecting the secondary battery 6 from the main controller 1, and preventing the secondary battery 6 from being overdischarged.
When the main power supply is in place, the main controller 1 detects the electric quantity of the secondary battery 6 according to the SNS _ P and the SNS _ M, when the voltage of the secondary battery 6 is lower than a third preset voltage, the main controller 1 configures the GPIO _1 pin into a PWM mode, and the main power supply charges the secondary battery 6 through the switch circuit 4 so as to ensure that the secondary battery 6 is always in a powered state.
Preferably, the main power supply and power failure detection unit 2 is electrically connected with the energy storage unit 3 and the switch unit 4 through a diode D1;
the detection end of the main power supply and power failure detection unit 2 is electrically connected with the anode of the diode D1, and the input end of the energy storage unit 3 and the output end of the switch unit 4 are electrically connected with the cathode of the diode D1. The diode D1 is a diode capable of passing a large current with a small voltage drop, and is used to prevent the energy storage unit 3 or the secondary battery 6 from flowing back to the power failure detection unit 2.
The utility model provides a power down protection device, fall the electricity suddenly when the main power supply, main control unit can not lose the power and shut down at once, power down protection device can trigger the soft flow of shutting down, main control unit shuts down the processing according to the lower electric current journey of formal, the mechanical equipment initiative that has guaranteed all operations resets, key data information uploads the high in the clouds backup, main control unit reruns self microsystem power off flow afterwards, guarantee integrated circuit chip's stability, prevent that chip, operating system or equipment from causing the harm because of falling the electricity suddenly. The power-down protection device also strengthens the control and maintenance of the secondary battery, and in order to reduce the consumption of the electric quantity of the secondary battery, the main controller can actively reduce the unnecessary load consumption; after the system is safely shut down, the power supply circuit is automatically disconnected, and the auxiliary battery is prevented from entering an over-discharge state; and meanwhile, a sampling detection resistor and a pin with a PWM function are added, when the main power supply is in place and the main controller detects that the electric quantity of the battery is too low, the auxiliary battery is charged to ensure that the auxiliary battery is always in a charged state.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. A power failure protection device is characterized by comprising a main controller, a power failure detection unit, an energy storage unit, a switch unit and a battery unit;
the input end of the energy storage unit is electrically connected with a main power supply, and the output end of the energy storage unit is electrically connected with the power supply input end of the main controller;
the detection end of the power failure detection unit is electrically connected with the main power supply, the signal sending end of the power failure detection unit is connected with the signal receiving end of the main controller, and when the voltage of the main power supply is lower than a first preset voltage, the power failure detection unit sends a power failure protection signal to the main controller;
the battery unit comprises an auxiliary battery, the anode of the auxiliary battery is electrically connected with the input end of the switch unit, and the cathode of the auxiliary battery is grounded;
the output end of the switch unit is electrically connected with the input end of the energy storage unit, the control signal receiving end of the switch unit is electrically connected with the control signal sending end of the main controller, when the main controller receives the power failure protection signal, the main controller sends a control signal to enable the switch unit to be switched on, and the auxiliary battery supplies power through the switch unit.
2. The power fail safe apparatus of claim 1, further comprising a rectifier circuit, wherein an input terminal of the rectifier circuit is electrically connected to the main power supply, an output terminal of the rectifier circuit is electrically connected to an input terminal of the energy storage unit and a detection terminal of the power fail detection unit, and the rectifier circuit is configured to convert an alternating current into a direct current of a second preset voltage when the main power supply is an alternating current.
3. The power-fail protection device according to claim 1, wherein the power-fail detection unit includes a first load resistor and a second load resistor connected in series, one end of the first load resistor is electrically connected to the detection terminal, the other end of the first load resistor is electrically connected to one end of the second load resistor and the signal transmission terminal, and the other end of the second load resistor is grounded.
4. The power fail safe apparatus of claim 3, wherein the first load resistor and the second load resistor have the same resistance value, and the resistance value is greater than 0.008 Ω and less than 0.012 Ω.
5. The power fail safe apparatus of claim 1, wherein the energy storage unit comprises a plurality of capacitors connected in parallel, each capacitor having an anode electrically connected to the input terminal of the energy storage unit and the output terminal of the energy storage unit, and a cathode grounded.
6. The power-fail protection device of claim 1, wherein the main controller controls the discharge of the secondary battery through the switch unit, and when the main controller is turned off, the main controller stops sending the control signal, and the switch unit is automatically turned off.
7. The power down protection device according to claim 1, further comprising a battery level detection circuit, wherein one end of the battery level detection circuit is electrically connected to the input terminal of the switch unit and the first voltage detection pin of the main controller, the other end of the battery level detection circuit is electrically connected to the positive electrode of the secondary battery and the second voltage detection pin of the main controller, and the battery level detection circuit is configured to send the voltage value of the secondary battery to the main controller.
8. The power-down protection device according to claim 7, wherein the secondary battery is a storage battery, the output terminal of the switching unit is electrically connected to the main power supply, and when the voltage of the secondary battery is lower than a third preset voltage and the voltage of the main power supply is higher than a first preset voltage, the main controller configures the control signal transmitting terminal to be in a PWM mode, so that the secondary battery is charged; the third preset voltage is lower than the first preset voltage.
9. The power fail safe apparatus of claim 1, wherein the switching unit comprises a first PMOS transistor, a second PMOS transistor, an NPN transistor, a third load resistor, a fourth load resistor, and a fifth load resistor;
the drain electrode of the second PMOS transistor is electrically connected with the output end of the switch unit, and the source electrode of the second PMOS transistor is electrically connected with the source electrode of the first PMOS transistor;
the drain electrode of the first PMOS transistor is electrically connected with the input end of the switch unit;
the grid electrode of the first PMOS transistor and the grid electrode of the second PMOS transistor are electrically connected with the collector electrode of the NPN type triode;
one end of the third load resistor is electrically connected with the grid electrode of the first PMOS transistor and the grid electrode of the second PMOS transistor, and the other end of the third load resistor is electrically connected with the source electrode of the first PMOS transistor and the source electrode of the second PMOS transistor;
the emitting electrode of the NPN type triode is grounded;
the base electrode of the NPN type triode is electrically connected with one end of the fourth load resistor;
the other end of the fourth load resistor is electrically connected with one end of the fifth load resistor and the control signal receiving end;
the other end of the fifth load resistor is grounded.
10. The power fail safe apparatus of claim 1, wherein the main power supply and the power fail detecting unit are electrically connected to the energy storage unit and the switching unit through diodes;
the power failure detection device comprises a main power supply, a power failure detection unit, an energy storage unit, a switch unit and a switch unit, wherein the main power supply and the detection end of the power failure detection unit are electrically connected with the positive electrode of a diode, and the input end of the energy storage unit and the output end of the switch unit are electrically connected with the negative electrode of the diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022539792.3U CN213484578U (en) | 2020-11-05 | 2020-11-05 | Power-down protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022539792.3U CN213484578U (en) | 2020-11-05 | 2020-11-05 | Power-down protection device |
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| Publication Number | Publication Date |
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| CN213484578U true CN213484578U (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022539792.3U Active CN213484578U (en) | 2020-11-05 | 2020-11-05 | Power-down protection device |
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| CN (1) | CN213484578U (en) |
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- 2020-11-05 CN CN202022539792.3U patent/CN213484578U/en active Active
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