Power failure protection circuit, electric energy management system and equipment

Abstract

The embodiment of the utility model discloses a power failure protection circuit, an electric energy management system and equipment. The power failure protection circuit comprises a first power supply branch connected between an input interface and an output interface, the input interface is used for connecting a power supply end, and the output interface is used for connecting an equipment power supply end; the first power supply branch is used for being conducted when the power supply end is electrified; the second power supply branch is connected in parallel with the first power supply branch, and the second power supply branch is used for charging when the power supply end is electrified and supplying power to the output interface when the power supply end is powered off; the sampling branch is connected between the input interface and the output interface, the output end of the sampling branch is connected with the control module, the sampling branch is used for collecting the power supply voltage of the input interface and outputting a level signal to the control module, and the control module is used for determining whether the input interface is powered down or not according to the level signal. According to the technical scheme provided by the embodiment of the utility model, equipment is powered when the input interface is suddenly powered down, key data are stored, and the operation reliability of an electric energy management system is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power supply protection, and in particular to a power failure protection circuit, an electric energy management system and equipment. Background Art

[0002] With the development of power management system technology, people have higher and higher requirements for power management system. In the case of sudden power failure, key data of existing power management system is easily lost, which affects the reliable operation of power management system. Utility Model Content

[0003] The embodiments of the present invention provide a power-off protection circuit, an electric energy management system and a device to solve the problem that key data of the electric energy management system is easily lost in the event of a sudden power failure, which affects the reliable operation of the electric energy management system.

[0004] In order to achieve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a power-off protection circuit, comprising:

[0006] a first power supply branch, the first power supply branch being connected between an input interface and an output interface, the input interface being used to connect to a power supply terminal, and the output interface being used to connect to a device power supply terminal; the first power supply branch being used to conduct when there is power at the power supply terminal;

[0007] a second power supply branch, the second power supply branch being connected in parallel with the first power supply branch, the second power supply branch being used for charging when the power supply end has power, and supplying power to the output interface when the power supply end is powered off;

[0008] A sampling branch, wherein the sampling branch is connected between the input interface and the output interface, and the output end of the sampling branch is connected to the control module. The sampling branch is used to collect the power supply voltage of the input interface and output a level signal to the control module. The control module is used to determine whether the input interface is powered off based on the level signal.

[0009] Optionally, the first power supply branch includes:

[0010] A first voltage-stabilizing diode, wherein a first electrode of the first voltage-stabilizing diode is connected to the input interface, a second electrode of the first voltage-stabilizing diode is connected to the output interface, and the first voltage-stabilizing diode is used for voltage stabilization.

[0011] Optionally, the second power supply branch includes: an anti-shock module and a storage module;

[0012] The first end of the anti-shock module is connected to the input interface, the second end of the anti-shock module is connected to the first end of the storage module and the output interface, and the second end of the storage module is connected to the ground end; the anti-shock module is used for current limiting, and the storage module is used for charging when the input interface has a power supply voltage output, and discharging to the output interface when the input interface is powered off.

[0013] Optionally, the anti-shock module includes: a second voltage-stabilizing diode, a first resistor, and a second resistor;

[0014] The first electrode of the second voltage regulator is connected to the input interface, the second electrode of the second voltage regulator is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the storage module.

[0015] Optionally, the storage module includes: a first supercapacitor, a second supercapacitor, a third supercapacitor, a third resistor, a fourth resistor and a fifth resistor;

[0016] The first supercapacitor, the second supercapacitor and the third supercapacitor are connected in series between the output interface and the ground terminal;

[0017] The third resistor is connected in parallel with the first supercapacitor, the fourth resistor is connected in parallel with the second supercapacitor, and the fifth resistor is connected in parallel with the third supercapacitor.

[0018] Optionally, the second power supply branch further includes:

[0019] A filter module connected between the input interface and the ground terminal;

[0020] The filtering module includes a fourth capacitor and a fifth capacitor, and the fourth capacitor and the fifth capacitor are connected in parallel between the input interface and the ground terminal.

[0021] Optionally, the sampling branch includes:

[0022] Signal coupling module and potential adjustment module;

[0023] The input end of the signal coupling module is connected between the input interface and the ground end, the output end of the signal coupling module is connected between the first end of the potential adjustment module and the ground end, and the second end of the potential adjustment module is connected to the output interface; the output end of the signal coupling module is connected to the signal detection end of the control module, the signal coupling module is used to output a level signal according to the power supply voltage of the input interface, and the control module is used to determine whether the input interface is powered off according to the level signal.

[0024] Optionally, the signal coupling module includes a photoelectric coupler, wherein the light-emitting diode of the photoelectric coupler serves as the input end of the signal coupling module, and the phototransistor of the photoelectric coupler serves as the output end of the signal coupling module; the light-emitting diode is configured to emit light when the input interface has a power supply voltage, and the phototransistor is configured to receive the light signal emitted by the light-emitting diode, turn on, and output a first level signal; the light-emitting diode is configured not to emit light when the input interface has no power supply voltage, and the phototransistor is configured to turn off when the light-emitting diode does not emit light, and output a second level signal;

[0025] The potential regulating module includes a sixth resistor, a first end of the sixth resistor is connected to the output end of the photoelectric coupler and the signal detection end of the control module, and a second end of the sixth resistor is connected to the output interface.

[0026] According to another aspect of the present invention, this embodiment provides an electric energy management system, including: the power-off protection circuit proposed in any item of the first aspect.

[0027] According to another aspect of the present invention, this embodiment provides a device, including: the power-off protection circuit proposed in any item of the first aspect, or the power management system proposed in the second aspect.

[0028] The power-off protection circuit provided by the embodiment of the present invention outputs a power supply voltage to the device connected to the output interface through the first power supply branch. It is charged through the second power supply branch. When the input interface loses power, the second power supply branch discharges to the output interface, thereby powering the device connected to the output interface so that the device can save data in time to avoid data loss at the moment of power failure. The input power supply voltage of the input interface is collected through the sampling branch and a level signal is output. The control module receives the level signal output by the sampling branch and sends a device power-off notification based on the level signal for on-site protection. This setting can remind the device to save data, thereby improving the reliability of the device operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of a power-off protection circuit provided by an embodiment of the present utility model;

[0031] Figure 2 This is a structural diagram of another power-off protection circuit provided by an embodiment of the present utility model;

[0032] Figure 3 This is a structural diagram of another power-off protection circuit provided by an embodiment of the present utility model;

[0033] Figure 4 This is a structural diagram of another power-off protection circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0035] Based on the above technical problems, this embodiment proposes the following solutions:

[0036] Figure 1 This is a schematic diagram of the structure of a power-off protection circuit provided by an embodiment of the present utility model. Figure 1 The power-off protection circuit provided by an embodiment of the present invention includes: a first power supply branch 1, the first power supply branch 1 is connected between an input interface Vin and an output interface Vout, the input interface Vin is used to connect to a power supply end, and the output interface Vout is used to connect to a device power supply end; the first power supply branch 1 is used to be turned on when the power supply end is powered; a second power supply branch 2, the second power supply branch 2 is connected in parallel with the first power supply branch 1, the second power supply branch 2 is used to charge when the power supply end is powered, and to supply power to the output interface Vout when the power supply end is powered off; a sampling branch 3, the sampling branch 3 is connected between the input interface Vin and the output interface Vout, the output end of the sampling branch 3 is connected to a control module 4, the sampling branch 3 is used to collect the power supply voltage of the input interface Vin, and output a level signal to the control module 4, and the control module 4 is used to determine whether the input interface Vin is powered off according to the level signal.

[0037] Specifically, the first power supply branch is a connection path between the input interface Vin and the output interface Vout. When the input interface Vin is powered, the power supply voltage input by the input interface Vin is supplied to the power supply device connected to the output interface Vout via the first power supply branch. During the initial power-on phase, the second power supply branch 2 is charged by the power supply voltage input by the input interface Vin. Once the energy storage module of the second power supply branch 2 is fully charged, the second power supply branch 2 stops charging. When the input interface Vin is powered off, the energy storage module of the second power supply branch 2 can supply power to the device connected to the output interface Vout. The device may include a controller for a power management system. This configuration allows the second power supply branch 2 to promptly supply power to the output interface Vout when the input interface Vin loses power. This allows the device connected to the output interface Vout to be powered by the second power supply branch at the moment the input interface Vin loses power, providing sufficient power supply time for the device to preserve data, thereby improving the reliability of the device's operation.

[0038] The sampling branch 3 is connected between the input interface Vin and the output interface Vout. The sampling branch 3 is used to collect the power supply voltage of the input interface Vin. When the input interface Vin has a power supply voltage, the sampling branch 3 outputs a first level signal to the control module 4. When the input interface Vin does not have a power supply voltage, the sampling branch 3 outputs a second level signal to the control module 4. The control module 4 can determine whether the input interface Vin is powered off based on the level signal output by the sampling branch 3. The control module 4 can be connected to the output interface Vout and powered by the output interface Vout, or the control module 4 can be powered by a backup power supply. The control module 4 can generate an early warning signal based on the power off signal of the input interface Vin, and send the early warning signal to notify the device to power off for on-site protection.

[0039] The power-off protection circuit provided in this embodiment outputs a power supply voltage to the device connected to the output interface Vout through the first power supply branch. It is charged through the second power supply branch 2. When the input interface Vin loses power, the second power supply branch 2 discharges to the output interface Vout, thereby powering the device connected to the output interface Vout so that the device can save data in time to avoid data loss at the moment of power failure. The input power supply voltage of the input interface Vin is collected through the sampling branch 3 and outputs a level signal. The control module 4 receives the level signal output by the sampling branch 3 and sends a device power-off notification based on the level signal for on-site protection. This setting can remind the device to save data, thereby improving the reliability of the device operation.

[0040] Optional, Figure 2 This is a schematic diagram of another power-off protection circuit provided by an embodiment of the present invention. Figure 2The first power supply branch includes: a first voltage regulator tube D1, a first pole of the first voltage regulator tube D1 is connected to the input interface Vin, a second pole of the first voltage regulator tube D1 is connected to the output interface Vout, and the first voltage regulator tube D1 is used for voltage stabilization.

[0041] Specifically, the first voltage-stabilizing diode D1 performs a voltage stabilization function. The first voltage-stabilizing diode D1 may include a voltage-stabilizing diode. When the reverse voltage exceeds a certain threshold (called the Zener voltage), the PN junction will breakdown, but it will not be damaged. Instead, it can operate stably in this breakdown state and provide a stable voltage output. When the first voltage-stabilizing diode D1 is in a reverse biased state and the reverse voltage gradually increases to the Zener voltage, the PN junction will suddenly turn on, and the current will increase sharply. However, at this time, the reverse voltage will basically remain near the Zener voltage and will no longer increase significantly with the increase in current. This characteristic enables the first voltage-stabilizing diode D1 to stabilize the voltage in the circuit and protect other components from the influence of voltage fluctuations.

[0042] Optionally, based on the above embodiments, continue to refer to Figure 2 The second power supply branch 2 may include: an anti-shock module 21 and a storage module 22; the first end of the anti-shock module 21 is connected to the input interface Vin, the second end of the anti-shock module 21 is connected to the first end of the storage module 22 and the output interface Vout, and the second end of the storage module 22 is connected to the ground end; the anti-shock module 21 is used for current limiting, and the storage module 22 is used for charging when the input interface Vin has a power supply voltage output, and discharging to the output interface Vout when the input interface Vin is powered off.

[0043] Specifically, the anti-shock module 21 may include a resistor, and is used to prevent the power supply connected to the input interface Vin from triggering overcurrent protection due to excessive charging current at the moment of power-on when the storage module 22 is fed with power.

[0044] Optional, Figure 3 This is a schematic diagram of the structure of another power-off protection circuit provided by the embodiment of the present utility model. Figure 3 The anti-shock module 21 may include: a second voltage-stabilizing diode D2, a first resistor R1, and a second resistor R2; the first electrode of the second voltage-stabilizing diode D2 is connected to the input interface Vin, the second electrode of the second voltage-stabilizing diode D2 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the storage module 22.

[0045] Specifically, the second voltage regulator diode D2 performs voltage stabilization. The second voltage regulator diode D2 stabilizes the voltage of the second power supply branch 2 at a certain threshold. The first resistor R1 and the second resistor R2 are connected in series. The first resistor R1 and the second resistor R2 function as current limiters. The first resistor R1 and the second resistor R2 prevent the power supply connected to the input interface Vin from triggering overcurrent protection due to excessive charging current at the moment of power-on when the storage module 22 is powered.

[0046] Optionally, based on the above embodiments, continue to refer to Figure 3 The storage module 22 includes: a first supercapacitor CD1, a second supercapacitor CD2, a third supercapacitor CD3, a third resistor R3, a fourth resistor R4, and a fifth resistor R5; the first supercapacitor CD1, the second supercapacitor CD2, and the third supercapacitor CD3 are connected in series between the output interface Vout and the ground terminal GND; the third resistor R3 is connected in parallel with the first supercapacitor CD1, the fourth resistor R4 is connected in parallel with the second supercapacitor CD2, and the fifth resistor R5 is connected in parallel with the third supercapacitor CD3.

[0047] Specifically, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are balancing resistors, which can prevent the voltage on the first supercapacitor CD1, the second supercapacitor CD2 and the third supercapacitor CD3 from being too high or too low, resulting in overvoltage failure of the first supercapacitor CD1, the second supercapacitor CD2 and the third supercapacitor CD3.

[0048] When the input interface Vin receives a power supply voltage, the first, second, and third supercapacitors CD1, CD2, and CD3 are charged via the second voltage regulator diode D2, the first resistor R1, and the second resistor R2. When the input interface Vin loses power, the first, second, and third supercapacitors CD1, CD2, and CD3 supply power to the device connected to the output interface Vout. Simultaneously, sampling branch 3 outputs a second level signal. Control module 4 determines device power failure based on the second level signal and performs on-site protection, preserving data and improving device reliability.

[0049] Optionally, based on the above embodiments, continue to refer to Figure 3 The second power supply branch 2 also includes: a filtering module 23, which is connected between the input interface Vin and the ground end; the filtering module 23 includes a fourth capacitor C1 and a fifth capacitor C2, and the fourth capacitor C1 and the fifth capacitor C2 are connected in parallel between the input interface Vin and the ground end.

[0050] Specifically, the filter module 23 is used to filter out high and low frequency ripples of the power supply voltage. The fourth capacitor C1 and the fifth capacitor C2 are input filter capacitors.

[0051] Optional, Figure 4 This is a schematic diagram of the structure of another power-off protection circuit provided by the embodiment of the present utility model. Figure 4 The sampling branch 3 includes: a signal coupling module 31 and a potential adjustment module 32; the input end of the signal coupling module 31 is connected between the input interface Vin and the ground end, the output end of the signal coupling module 31 is connected between the first end of the potential adjustment module 32 and the ground end, and the second end of the potential adjustment module 32 is connected to the output interface Vout; the output end of the signal coupling module 31 is connected to the signal detection end of the control module 4, the signal coupling module 31 is used to output a level signal according to the power supply voltage of the input interface Vin, and the control module 4 is used to determine whether the input interface Vin is powered off according to the level signal.

[0052] Specifically, the signal coupling module 31 is used to couple the power supply voltage of the input interface Vin. When the input interface Vin is receiving the power supply voltage normally and the signal coupling module 31 is turned on, the potential adjustment module 32 is connected to the ground terminal, so that the potential output to the control module 4 is a low-level signal. When the input interface Vin is powered off and the signal coupling module 31 is turned off, the potential output to the control module 4 is equal to the potential of the potential adjustment module 32, and both are equal to the potential of the output interface Vout. When the control module 4 receives a high-level signal, it determines that the input interface Vin is powered off, notifies the device that it is in power-off protection, and performs data preservation.

[0053] Optionally, based on the above embodiments, continue to refer to Figure 4 The signal coupling module 31 includes a photoelectric coupler U1, the light-emitting diode of the photoelectric coupler U1 serves as the input end of the signal coupling module 31, and the phototransistor of the photoelectric coupler U1 serves as the output end of the signal coupling module 31; the light-emitting diode is used to emit light when the input interface Vin has a power supply voltage, and the phototransistor is used to receive the light signal emitted by the light-emitting diode and turn on, and output a first level signal; the light-emitting diode is used not to emit light when the input interface Vin has no power supply voltage, and the phototransistor is used to turn off when the light-emitting diode does not emit light, and output a second level signal; the potential adjustment module 32 includes a sixth resistor R6, a first end of the sixth resistor R6 is connected to the output end of the photoelectric coupler U1 and the signal detection end of the control module 4, and a second end of the sixth resistor R6 is connected to the output interface Vout.

[0054] Specifically, the power supply voltage of the input interface Vin is input into the light-emitting diode of the optocoupler U1, and the light-emitting diode emits light under the action of the input power supply voltage. When the phototransistor receives the light from the light-emitting diode, its first and second poles are turned on, and a low-level signal is output to the control module 4. When the input interface Vin is powered off, the light-emitting diode does not emit light, the phototransistor does not receive light, and its first and second poles are turned off. The control module 4 is connected to the output interface Vout through the sixth resistor R6. Since the current output interface Vout is discharged by the second power supply branch 2, the control module 4 receives a high-level signal. When the control module 4 receives a high-level signal, the control module 4 determines that the device is powered off, thereby starting the power-off protection.

[0055] Optional, see Figure 4 The sampling branch 3 may further include a seventh resistor R7 and a fourth voltage regulator diode D4. The seventh resistor R7 and the fourth voltage regulator diode D4 are connected in series between the input interface Vin and the optocoupler U1. The seventh resistor R7 and the fourth voltage regulator diode D4 provide voltage stabilization. The second power supply branch 2 may further include a third voltage regulator diode connected between the first supercapacitor CD1 and the output interface Vout. The third voltage regulator diode provides voltage stabilization.

[0056] This embodiment provides an electric energy management system. The electric energy management system provided by this embodiment includes the power failure protection circuit proposed in any of the above embodiments, and has the beneficial effects of the power failure protection circuit proposed in any of the above embodiments, which will not be described in detail here.

[0057] This embodiment provides a device. The device provided in this embodiment includes the power-off protection circuit proposed in any of the above embodiments, or includes the power management system proposed in any of the above embodiments, and has the beneficial effects of the power-off protection circuit proposed in any of the above embodiments, which will not be described in detail here.

[0058] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power-off protection circuit, characterized in that: include: A first power supply branch, the first power supply branch being connected between an input interface and an output interface, the input interface being used to connect to a power supply end, and the output interface being used to connect to a device power supply end; The first power supply branch is used to be turned on when there is power at the power supply end; a second power supply branch, the second power supply branch being connected in parallel with the first power supply branch, the second power supply branch being used for charging when the power supply end has power, and supplying power to the output interface when the power supply end is powered off; A sampling branch, wherein the sampling branch is connected between the input interface and the output interface, and the output end of the sampling branch is connected to the control module. The sampling branch is used to collect the power supply voltage of the input interface and output a level signal to the control module. The control module is used to determine whether the input interface is powered off based on the level signal.

2. The power-off protection circuit according to claim 1, wherein: The first power supply branch includes: A first voltage-stabilizing diode, wherein a first electrode of the first voltage-stabilizing diode is connected to the input interface, a second electrode of the first voltage-stabilizing diode is connected to the output interface, and the first voltage-stabilizing diode is used for voltage stabilization.

3. The power-off protection circuit according to claim 1, wherein: The second power supply branch includes: impact-resistant modules and storage modules; The first end of the anti-shock module is connected to the input interface, the second end of the anti-shock module is connected to the first end of the storage module and the output interface, and the second end of the storage module is connected to the ground end; the anti-shock module is used for current limiting, and the storage module is used for charging when the input interface has a power supply voltage output, and discharging to the output interface when the input interface is powered off.

4. The power-off protection circuit according to claim 3, characterized in that: The shock-resistant module comprises: a second voltage-stabilizing diode, a first resistor, and a second resistor; The first electrode of the second voltage regulator is connected to the input interface, the second electrode of the second voltage regulator is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the storage module.

5. The power-off protection circuit according to claim 3, characterized in that: The storage module includes: a first supercapacitor, a second supercapacitor, a third supercapacitor, a third resistor, a fourth resistor, and a fifth resistor; The first supercapacitor, the second supercapacitor and the third supercapacitor are connected in series between the output interface and the ground terminal; The third resistor is connected in parallel with the first supercapacitor, the fourth resistor is connected in parallel with the second supercapacitor, and the fifth resistor is connected in parallel with the third supercapacitor.

6. The power-off protection circuit according to claim 3, characterized in that: The second power supply branch further includes: A filter module connected between the input interface and the ground terminal; The filtering module includes a fourth capacitor and a fifth capacitor, and the fourth capacitor and the fifth capacitor are connected in parallel between the input interface and the ground terminal.

7. The power-off protection circuit according to claim 1, wherein: The sampling branch includes: Signal coupling module and potential adjustment module; The input end of the signal coupling module is connected between the input interface and the ground end, the output end of the signal coupling module is connected between the first end of the potential adjustment module and the ground end, and the second end of the potential adjustment module is connected to the output interface; the output end of the signal coupling module is connected to the signal detection end of the control module, the signal coupling module is used to output a level signal according to the power supply voltage of the input interface, and the control module is used to determine whether the input interface is powered off according to the level signal.

8. The power-off protection circuit according to claim 7, characterized in that: The signal coupling module includes a photoelectric coupler, wherein the light-emitting diode of the photoelectric coupler serves as an input end of the signal coupling module, and the phototransistor of the photoelectric coupler serves as an output end of the signal coupling module; the light-emitting diode is configured to emit light when the input interface has a power supply voltage, and the phototransistor is configured to receive the light signal emitted by the light-emitting diode, turn on, and output a first level signal; the light-emitting diode is configured to not emit light when the input interface has no power supply voltage, and the phototransistor is configured to turn off when the light-emitting diode does not emit light, and output a second level signal; The potential regulating module includes a sixth resistor, a first end of the sixth resistor is connected to the output end of the photoelectric coupler and the signal detection end of the control module, and a second end of the sixth resistor is connected to the output interface.

9. An electric energy management system, characterized in that: include: The power-off protection circuit according to any one of claims 1 to 8.

10. A device, characterized in that include: The power-off protection circuit according to any one of claims 1 to 8, or the power management system according to claim 9.

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