Power-down protection circuit for electronic system
By combining the power supply circuit, charging circuit, and power failure detection module, the problems of system crashes and capacitor overcharging and short circuits when the power supply is insufficient are solved, power failure protection is achieved, and the system is ensured to operate stably.
Patent Information
- Application Number
- CN202422971794.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-03
AI Technical Summary
In existing technologies, electronic systems are prone to crashing and losing data when power supply is insufficient, and overcharging or short-circuiting of capacitors can lead to startup failures.
It employs a power supply circuit, a charging circuit, a clamping circuit, and a power failure detection module. Through current limiting protection, capacitor voltage maintenance, and power failure detection, it prevents capacitor overcharging and short circuits, ensures balanced capacitor charge, and achieves power failure protection.
It effectively prevents data loss and capacitor short circuits in electronic systems when power is lost, ensuring stable system operation and avoiding system crashes and restart failures.
Smart Images
Figure CN223680767U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electronic technical field especially relates to a kind of electronic system power failure protection circuit. BACKGROUND
[0002] Power failure protection circuit is the circuit for protecting electronic equipment and circuit from damage that power failure or power interruption can cause. It ensures that the system can respond correctly when the power is off, protects the equipment from damage and data loss, and provides reliable power switching to ensure the continuous and stable operation of the equipment. The conventional power failure protection operation is to increase input and output capacitors, but increasing the capacity will cause the front power supply to be insufficient and appear the phenomenon of dead machine, or the capacity of the rear circuit is too large, which leads to system short circuit and start failure. SUMMARY
[0003] In view of the problems existing in the prior art, the utility model provides a kind of electronic system power failure protection circuit, to solve the problems of power supply insufficient, system dead machine loss data and start failure, and capacitor overcharge and short circuit.
[0004] To achieve the above purpose, the technical scheme adopted by the utility model is: a kind of electronic system power failure protection circuit, including power supply, further comprising: for the power supply of load Power supply circuit, the power supply circuit is connected with first unidirectional diode;For charging capacitor and having overcurrent protection charging circuit;For detecting the power supply state of power failure detection module;The voltage of the capacitor can be kept consistent by clamping circuit;The clamping circuit is connected with first capacitor and second capacitor in series, and the two ends of the first capacitor are connected with first voltage reference chip in parallel, and the two ends of the second capacitor are connected with second voltage reference chip in parallel.
[0005] Based on the above, the utility model includes power supply circuit, charging circuit, clamping circuit and power failure detection module. When powered by the power supply, current will be supplied to the load through the power supply circuit, and at the same time, the first capacitor and the second capacitor will be charged through the charging circuit. A current-limiting resistor and a triode are provided on the charging circuit to prevent instantaneous short circuit. The clamping circuit is connected with first capacitor and second capacitor in series, which improves the capacitor output voltage. At the same time, the first capacitor and the second capacitor are respectively connected with first voltage reference chip and second voltage reference chip in parallel, which can prevent capacitor overcharge and ensure that the charge stored in the two series capacitors is the same. The power failure detection module can detect the working state of the power supply. When power failure is detected, the first capacitor and the second capacitor will supply power, play the role of power failure protection, and avoid data loss.
[0006] Further, the charging circuit comprises a first resistor, a second resistor, a first triode, a second triode, a second unidirectional diode and a third unidirectional diode, one end of the first resistor and an emitter of the first triode are connected with a positive output end of the power supply, a base of the first triode and an emitter of the second triode are connected with the other end of the first resistor, a collector of the first triode and a base of the second triode are connected with one end of the second resistor, the other end of the second resistor is connected with a negative pole of the power supply, a collector of the second triode is connected with an anode of the second unidirectional diode, a cathode of the second unidirectional diode is connected with an anode of the third unidirectional diode, and a cathode of the third unidirectional diode is connected with an output end of the circuit.
[0007] Based on the above, the first resistor can play a role of current limiting for the charging circuit, preventing instantaneous short circuit, and the first triode and the second triode play a role of overcurrent protection and constant current charging.
[0008] Further, the power-off detection module comprises a third resistor, a fourth resistor and an MCU, one end of the third resistor is connected with a positive pole of the power supply, the other end of the third resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with a negative pole of the power supply, and a connection point of the third resistor and the fourth resistor is connected with an ADC pin of the MCU.
[0009] Based on the above, the third resistor and the fourth resistor play a role of voltage division in the circuit, and after voltage division, the MCU detects, and finally calculates the power supply voltage and performs logical judgment. If the power supply voltage is lost, the power-off protection process is entered, and the power supply is supplied by the power-off protection circuit.
[0010] Further, one end of the clamping circuit is connected with a cathode of the second unidirectional diode, and the other end of the clamping circuit is connected with a negative pole of the power supply.
[0011] In order to make the above features of the utility model and the purposes to be achieved more clearly, the utility model is further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is the circuit principle diagram of the utility model.
[0013] BRIEF DESCRIPTION OF DRAWINGS 1 power supply circuit;2 charging circuit;3 power-off detection module;4 clamping circuit;5 first voltage reference chip;6 second voltage reference chip. DETAILED DESCRIPTION
[0014] As Figure 1As shown, a power-off protection circuit of an electronic system includes a power supply DC, further comprising: a power supply circuit 1 for supplying power to a load, the power supply circuit 1 being connected with a first unidirectional diode D1; a charging circuit 2 for charging a capacitor and having overcurrent protection; a power-off detection module 3 for detecting the state of the power supply DC; a clamping circuit 4 capable of keeping the voltage of the capacitor consistent, the clamping circuit 4 being connected in series with a first capacitor C1 and a second capacitor C2, the two ends of the first capacitor C1 being connected in parallel with a first voltage reference chip 5, and the two ends of the second capacitor C2 being connected in parallel with a second voltage reference chip 6.
[0015] The charging circuit 2 includes a first resistor R1, a second resistor R2, a first triode V1, a second triode V2, a second unidirectional diode D2 and a third unidirectional diode D3, one end of the first resistor R1 and the emitter of the first triode V1 being connected with the positive output end of the power supply DC, the base of the first triode V1 and the emitter of the second triode V2 being connected with the other end of the first resistor R1, the collector of the first triode V1 and the base of the second triode V2 being connected with one end of the second resistor R2, the other end of the second resistor R2 being connected with the negative pole of the power supply DC, the collector of the second triode V2 being connected with the anode of the second unidirectional diode D2, the cathode of the second unidirectional diode D2 being connected with the anode of the third unidirectional diode D3, and the cathode of the third unidirectional diode D3 being connected with the output end of the circuit.
[0016] The power-off detection module 3 includes a third resistor R3, a fourth resistor R4 and an MCU, one end of the third resistor R3 being connected with the positive pole of the power supply DC, the other end of the third resistor R3 being connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 being connected with the negative pole of the power supply DC, and the connection point of the third resistor R3 and the fourth resistor R4 being connected with the ADC pin of the MCU.
[0017] One end of the clamping circuit 4 is connected with the cathode of the second unidirectional diode D2, and the other end of the clamping circuit 4 is connected with the negative pole of the power supply DC.
[0018] The specific implementation of the embodiment is that when powered by the power supply DC, current is supplied to the load through the power supply circuit 1, and at the same time, the first capacitor C1 and the second capacitor C2 are charged through the charging circuit 2, the first resistor R1 limits the current to prevent instantaneous short circuit. The third resistor R3 and the fourth resistor R4 play a role of voltage division in the circuit, and after voltage division, detection is performed by the MCU, and finally the power supply DC voltage is inversely calculated and logically judged. If the power supply DC voltage is lost, the power-off protection process is entered, and power supply is performed by the clamping circuit 4. The clamping circuit 4 is provided with the first capacitor C1 and the second capacitor C2 in series, and the capacitor output voltage is improved. Meanwhile, the first voltage reference chip 5 and the second voltage reference chip 6 are respectively connected in parallel with the first capacitor C1 and the second capacitor C2, which can prevent the first capacitor C1 and the second capacitor C2 from being overcharged, and ensure that the charge amounts stored in the first capacitor C1 and the second capacitor C2 are the same, and prevent uneven charge amounts.
[0019] The above is only the optimal solution embodiment of the utility model, and is not used to limit the utility model. Various modifications or replacements of the utility model made by those skilled in the art without departing from the essence and protection scope of the utility model should be within the protection scope of the utility model.
Claims
1. An electronic system brown-out protection circuit comprising a power supply (DC), characterized in that, Also include: Power supply circuit (1) for power supply to the load, the power supply circuit (1) is connected with the first unidirectional diode (D1); Charging circuit (2) for charging the capacitor and having overcurrent protection; Power failure detection module (3) for detecting the power supply state of the power supply (DC); The clamping circuit (4) capable of keeping the voltage of the capacitor consistent, the clamping circuit (4) is connected in series with the first capacitor (C1) and the second capacitor (C2), the two ends of the first capacitor (C1) are connected in parallel with the first voltage reference chip (5), and the two ends of the second capacitor (C2) are connected in parallel with the second voltage reference chip (6).
2. The electronic system brown-out protection circuit of claim 1, wherein: The charging circuit (2) includes a first resistor (R1), a second resistor (R2), a first transistor (V1), a second transistor (V2), a second unidirectional diode (D2) and a third unidirectional diode (D3), one end of the first resistor (R1) and the emitter of the first transistor (V1) are connected with the positive output end of the power supply (DC), the base of the first transistor (V1) and the emitter of the second transistor (V2) are connected with the other end of the first resistor (R1), the collector of the first transistor (V1) and the base of the second transistor (V2) are connected with one end of the second resistor (R2), the other end of the second resistor (R2) is connected with the negative electrode of the power supply (DC), the collector of the second transistor (V2) is connected with the anode of the second unidirectional diode (D2), the cathode of the second unidirectional diode (D2) is connected with the anode of the third unidirectional diode (D3), and the cathode of the third unidirectional diode (D3) is connected with the output end of the circuit.
3. The electronic system brown-out protection circuit of claim 1, wherein: The power failure detection module (3) includes a third resistor (R3), a fourth resistor (R4) and an MCU, one end of the third resistor (R3) is connected with the positive electrode of the power supply (DC), the other end of the third resistor (R3) is connected with one end of the fourth resistor (R4), the other end of the fourth resistor (R4) is connected with the negative electrode of the power supply (DC), and the connection point of the third resistor (R3) and the fourth resistor (R4) is connected with the ADC pin of the MCU.
4. The electronic system brown-out protection circuit of claim 2, wherein: One end of the clamping circuit (4) is connected with the cathode of the second unidirectional diode (D2), and the other end of the clamping circuit (4) is connected with the negative electrode of the power supply (DC).