Power supply protection circuit, device, system and method

Abstract

The present invention proposes a power protection circuit, device, system and method. The power protection circuit is forward-conducted by the switch circuit during the pulse low level time, so that the power supply provides the power supply voltage for the energy storage circuit; the energy storage circuit receives the power supply voltage output by the power supply to store energy; the switch circuit is reverse-conducted during the pulse high level time; when the switch circuit is reverse-conducted, the energy storage circuit outputs a pulse voltage to the pulse load circuit to supply power to the pulse load circuit. In the present invention, a switch circuit is set to connect the energy storage circuit to the power supply and the pulse load circuit respectively, and the switch circuit is turned on in a time-division multiplexing manner to effectively improve the use efficiency of the switch element and reduce resource waste during the process of using the energy storage element for power supply.

Description

Technical Field

[0001] The present invention relates to the field of power supply technology, and in particular to a power supply protection circuit, device, system and method. Background Art

[0002] During vehicle use, although the on-board level can provide a large output current, many applications in the car (such as ignition start, etc.) require instantaneous large current, so the instantaneous fluctuation of the level voltage during vehicle use is very large.

[0003] Because the circuit system of a car is directly related to the safety of driving, supercapacitors are often seen in car electronic systems. Usually, the purpose of using supercapacitors is to provide a more stable power supply voltage for the application end, such as not affecting the operation of electronic devices such as electronic screens, radios and air conditioners when ignition is turned on, or to reduce the instantaneous impact of load mutations on the level. The main function of the supercapacitor is to reduce the mutual interference between the level and the load.

[0004] In the prior art, the charging process and the discharging process of the supercapacitor usually use different circuits, and each circuit includes a large number of components. The supercapacitor is first charged through the charging circuit used in the charging process, and then the pulse load is powered by the discharge process of the supercapacitor. The pulse load only requires a very short power supply time, so there will inevitably be a certain amount of resource waste during the use of the supercapacitor.

[0005] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0006] The main purpose of the present invention is to provide a power supply protection circuit, device, system and method, aiming to solve the technical problem of resource waste in the process of using supercapacitor power supply in the prior art.

[0007] To achieve the above object, the present invention provides a power protection circuit, which includes: a switch circuit and an energy storage circuit;

[0008] Wherein, the energy storage circuit is connected to the power supply and the pulse load circuit respectively through the switch circuit;

[0009] The switch circuit is used for forward conduction during the pulse low level time, so that the power supply provides the power supply voltage to the energy storage circuit;

[0010] The energy storage circuit is used to receive the power supply voltage output by the power supply to store energy;

[0011] The switch circuit is also used for reverse conduction during the pulse high level time;

[0012] The energy storage circuit is also used to output a pulse voltage to the pulse load circuit to supply power to the pulse load circuit when the switch circuit is reversely conducted.

[0013] Optionally, the power protection circuit further includes: a voltage regulating circuit;

[0014] Wherein, the voltage regulating circuit is connected to the switch circuit and the energy storage circuit respectively;

[0015] The voltage regulating circuit is used to regulate the power supply voltage output by the power supply during the pulse low level time, and output the regulated power supply voltage to the energy storage circuit;

[0016] The energy storage circuit is also used to receive the regulated power supply voltage for energy storage.

[0017] Optionally, the voltage regulating circuit is further used to receive the pulse voltage output by the energy storage circuit during the pulse high level time;

[0018] The voltage regulating circuit is also used to regulate the pulse voltage and output the regulated pulse voltage to the pulse load circuit.

[0019] Optionally, the switch circuit includes: a single-pole double-throw switch;

[0020] Among them, the first moving end of the single-pole double-throw switch is connected to the power supply, the second moving end of the single-pole device switch is connected to the pulse load circuit, and the fixed end of the single-pole double-throw switch is connected to the voltage regulation circuit.

[0021] Optionally, the voltage regulating circuit includes: a first inductor, a first switch and a second switch;

[0022] The first end of the first switch is connected to the fixed end of the single-pole double-throw switch, the second end of the first switch is connected to the first end of the second switch and the first end of the first inductor, the second end of the first inductor is connected to the energy storage circuit, and the second end of the second switch is grounded.

[0023] Optionally, the voltage regulating circuit further includes: a third switch and a fourth switch;

[0024] The first end of the third switch is connected to the first end of the fourth switch and the second end of the first inductor, and the second end of the fourth switch is connected to the energy storage circuit.

[0025] Optionally, the energy storage circuit comprises: a super capacitor;

[0026] The first end of the super capacitor is connected to the second end of the fourth switch, and the second end of the super capacitor is grounded.

[0027] To achieve the above object, the present invention further provides a power supply protection device, which includes the above power supply protection circuit.

[0028] To achieve the above object, the present invention also proposes a power supply protection system, which includes: a power supply, a pulse load circuit and the power supply protection device, and the power supply protection device is connected to the power supply and the pulse load circuit respectively.

[0029] To achieve the above object, the present invention further provides a power supply protection method, which comprises:

[0030] During the pulse low level time, the switch circuit is forwardly turned on, so that the power supply provides a power supply voltage to the energy storage circuit;

[0031] Receiving the power supply voltage output by the power supply to store energy in the energy storage circuit;

[0032] Reverse conduction of the switch circuit during the high level time of the pulse;

[0033] When the switch circuit is reversely conducted, the energy storage circuit outputs a pulse voltage to the pulse load circuit to supply power to the pulse load circuit.

[0034] The present invention proposes a power protection circuit, device, system and method. The power protection circuit is forward-conducted by the switch circuit during the pulse low level time, so that the power supply provides the power supply voltage for the energy storage circuit; the energy storage circuit receives the power supply voltage output by the power supply to store energy; the switch circuit is reverse-conducted during the pulse high level time; when the switch circuit is reverse-conducted, the energy storage circuit outputs a pulse voltage to the pulse load circuit to supply power to the pulse load circuit. In the present invention, a switch circuit is set to connect the energy storage circuit to the power supply and the pulse load circuit respectively, and the switch circuit is turned on in a time-division multiplexing manner to effectively improve the use efficiency of the switch element and reduce resource waste during the process of using the energy storage element for power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 structures shown in these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of a first embodiment of a power protection circuit proposed in an embodiment of the invention;

[0037] Figure 2 A schematic diagram of the structure of a second embodiment of a power protection circuit proposed in an embodiment of the invention;

[0038] Figure 3 A first circuit structure diagram of a second embodiment of a power protection circuit proposed in an embodiment of the invention;

[0039] Figure 4 A second circuit structure diagram of the second embodiment of the power protection circuit proposed in the embodiment of the invention;

[0040] Figure 5 This is a flow chart of a first embodiment of a power protection method according to an embodiment of the present invention.

[0041] Description of Figure Numbers:

[0042] Label name Label name 10 Switching Circuit VIN Power supply 20 Tank Circuit SK SPDT Switch 30 Voltage Regulation Circuit S1~S4 1st to 4th switches D1 The first diode R1 First resistor L1 First Inductor C1 Supercapacitor GND Grounding

[0043] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the power protection circuit proposed in the embodiment of the invention. Figure 1 , a first embodiment of the power protection circuit of the present invention is proposed.

[0049] In this embodiment, the power protection circuit includes: a switch circuit 10 and a storage circuit 20;

[0050] The energy storage circuit 20 is connected to the power supply VIN and the pulse load circuit respectively through the switch circuit 10 .

[0051] It should be understood that two separate switch circuits are usually used in the prior art, one of which controls the power supply process of the power supply VIN to the energy storage element, and the other switches The circuit controls the connection between the energy storage element and the load circuit. When the energy storage element is used to power the load circuit alone, the pulse load only needs a very short power supply time. The power supply VIN first charges the energy storage element, and then uses the discharge process of the energy storage element to provide a pulse voltage for the pulse load. In the process of charging the energy storage element, the time of a complete charging cycle may not be required, so the components involved in the charging process of the energy storage element are not effectively utilized during the period between the completion of charging and the discharge of the energy storage element. In addition, in order to avoid the load circuit from affecting the power supply VIN, it is necessary to disconnect the energy storage circuit between the power supply VIN and the energy storage element, and the switch circuit in the energy storage circuit is in an idle state; and in the process of charging the energy storage element by the power supply VIN, it is necessary to disconnect the connection between the load circuit and the energy storage element, and the switch circuit between the energy storage element and the load circuit is in an idle state.

[0052] It should be noted that the switch circuit 10 is a circuit for controlling whether the power supply VIN is connected to the energy storage circuit 20 or controlling whether the energy storage circuit 20 is connected to the pulse load. When the switch circuit 10 is forward-conducting, the power supply VIN can charge the energy storage element in the energy storage circuit 20 through the switch circuit 10; when the switch circuit 20 is reverse-conducting, the energy storage element in the energy storage circuit 20 can be discharged through the switch circuit 10 to provide a pulse voltage for the load pulse. The energy storage circuit is a circuit for storing or releasing energy. When the energy storage circuit is directly connected to the power supply, the energy storage circuit can store energy according to the voltage output by the power supply; when the energy storage circuit is connected to the load, the energy storage circuit can output a voltage to the load to power the load. The pulse load circuit is a load circuit that receives a pulse voltage or a pulse circuit. The pulse load circuit may require a large current or voltage to pass through in a short time. For example, when the vehicle is ignited and started, the load in the pulse load circuit is an internal combustion engine, and a large current needs to pass through during the ignition process of the internal combustion engine.

[0053] Among them, the pulse low level time is the time when the energy storage circuit does not need to provide a pulse voltage to the pulse load circuit, and the pulse high level time is the time when the energy storage circuit needs to provide a pulse voltage to the pulse load circuit. The pulse voltage is the voltage that enables the load in the pulse load circuit to work normally. During the effective time of the pulse, the load can work normally according to the pulse voltage.

[0054] In a specific implementation, the switch circuit 10 is forward-conducted during the pulse low level time, so that the power supply provides a power supply voltage for the energy storage circuit; the energy storage circuit 20 receives the power supply voltage output by the power supply to store energy; the switch circuit 10 is reverse-conducted during the pulse high level time; the energy storage circuit 20 outputs a pulse voltage to the pulse load circuit to power the pulse load circuit when the switch circuit is reverse-conducted.

[0055] In this embodiment, a power protection circuit is proposed. The power protection circuit is forward-conducted by the switch circuit during the pulse low level time, so that the power supply provides the power supply voltage for the energy storage circuit; the energy storage circuit receives the power supply voltage output by the power supply to store energy; the switch circuit is reverse-conducted during the pulse high level time; when the switch circuit is reverse-conducted, the energy storage circuit outputs a pulse voltage to the pulse load circuit to supply power to the pulse load circuit. In the present invention, a switch circuit is set to connect the energy storage circuit to the power supply and the pulse load circuit respectively, and the switch circuit is turned on in a time-division multiplexing manner to effectively improve the use efficiency of the switch element and reduce resource waste in the process of using the energy storage element for power supply.

[0056] Reference Figure 2 , Figure 2The second embodiment of the power protection circuit of the present invention is a schematic diagram of the structure of the second embodiment of the power protection circuit. Based on the first embodiment of the power protection circuit, the second embodiment of the power protection circuit of the present invention is proposed.

[0057] In this embodiment, the power protection circuit further includes: a voltage regulating circuit 30;

[0058] The voltage regulating circuit 30 is connected to the switch circuit 10 and the energy storage circuit 20 respectively.

[0059] It should be understood that the voltage regulating circuit 30 is a circuit for regulating the power supply voltage output by the power supply VIN or the pulse voltage output by the energy storage circuit 20. In the prior art, two voltage regulating circuits are usually used to regulate the power supply voltage and the pulse voltage respectively. The voltage regulating circuit 30 can be a boost circuit or a buck circuit, and the voltage regulating circuit 30 can be voltage regulated by setting components such as a transformer. In the voltage regulation process, it is usually necessary to use a control chip to control the voltage regulation process. For the two voltage regulating circuits in the prior art, it is necessary to explain that the two control chips are controlled. Therefore, in the prior art, it is not only necessary to use two voltage regulating circuits for voltage regulation, but also to set the control chips of the corresponding two voltage regulating circuits. The two voltage regulating circuits and the corresponding two control chips in the prior art will not be used at the same time. When one voltage regulating circuit and the corresponding control chip are in use, the other voltage regulating circuit and the corresponding control chip are in an idle state, which will also cause a lot of resource waste.

[0060] In a specific implementation, when storing energy in the energy storage circuit 20, the voltage regulating circuit 30 can regulate the power supply voltage output by the power supply VIN during the pulse low level time, and output the regulated power supply voltage to the energy storage circuit 20. The energy storage circuit 20 stores energy when receiving the regulated power supply voltage. When supplying power to the pulse load circuit, the voltage regulating circuit 30 is also used to receive the pulse voltage output by the energy storage circuit 20 during the pulse high level time, regulate the pulse voltage, and output the regulated pulse voltage to the pulse load circuit.

[0061] Reference Figure 3 In this embodiment, the switch circuit 10 includes: a single-pole double-throw switch SK;

[0062] The first moving end of the single-pole double-throw switch SK is connected to the power supply VIN, the second moving end of the single-pole device switch SK is connected to the pulse load circuit, and the fixed end of the single-pole double-throw switch SK is connected to the voltage regulating circuit 30.

[0063] It should be noted that, refer to Figure 3 When the first moving end of the single-pole double-throw switch SK is connected to the power supply, the power supply VIN is connected to the energy storage circuit 20 through the first moving end and the fixed end of the single-pole double-throw switch SK; when the second moving end of the single-pole double-throw switch SK is connected to the pulse load circuit, the energy storage circuit 20 is directly connected to the pulse load circuit through the fixed end and the second moving end of the single-pole double-throw switch SK. Of course, in this embodiment, other switch components with the same function can also be used, which is not specifically limited here.

[0064] In a specific implementation, during the pulse low level time, the energy storage circuit 20 can be charged, the contact of the single-pole double-throw switch SK is controlled to throw the first moving end, the energy storage loop between the power supply VIN and the energy storage circuit 20 is turned on, and the power supply VIN directly outputs the power supply voltage, which is directly input into the energy storage circuit 20 after being adjusted by the voltage regulating circuit 30, so as to store energy for the energy storage circuit 20. During the pulse high level time, the energy storage circuit 20 needs to output a pulse voltage, at this time, the contact of the single-pole double-throw switch SK is controlled to throw the second moving end, the energy storage circuit 20 is directly connected to the pulse load circuit through the fixed end and the second moving end of the single-pole double-throw switch SK, and the energy storage circuit 20 outputs a pulse voltage, which is directly output to the pulse load circuit after being adjusted by the voltage regulating circuit 30, so as to supply power to the pulse load circuit.

[0065] In this embodiment, the voltage regulating circuit 30 includes: a first inductor L1, a first switch and a second switch;

[0066] Among them, the first end of the first switch is connected to the fixed end of the single-pole double-throw switch SK, the second end of the first switch is connected to the first end of the second switch and the first end of the first inductor, the second end of the first inductor is connected to the energy storage circuit, and the second end of the second switch is grounded.

[0067] It should be noted that, in this embodiment, the power supply voltage and the pulse voltage can be regulated by the inductor. In this embodiment, a step-down circuit is formed by using the first inductor L1, the first switch K1 and the second switch K2. In the process of charging the first inductor L1, the single-pole double-throw switch SK waves to the first active end, the first switch S1 is closed and the second switch S2 is disconnected; in the process of active discharge of the first inductor L1, the first switch S1 is disconnected and the second switch S2 is closed. The power supply voltage output by the power supply VIN is a constant voltage, and the charging rate of the power supply voltage to the first inductor L1 is relatively fast. During the discharge process of the first inductor L1, the energy stored in the first inductor L1 will be slowly released due to the inductance characteristics, thereby realizing voltage regulation. Of course, in this embodiment, a transformer can also be directly set. During the low-level pulse time, the first end of the transformer is used as the primary coil and the second end is used as the induction coil; during the high-level pulse time, the second end of the transformer is used as the primary coil and the first end is used as the induction coil.

[0068] In a specific implementation, during the pulse low level time, the contact of the single-pole double-throw switch SK is thrown to the first moving end, the first switch S1 is closed and the second switch S2 is opened, the power supply VIN outputs the power supply voltage to the first inductor L1 to charge the first inductor L1, and then the first switch S1 is opened and the second switch S2 is closed to release the energy stored in the first inductor L1 to achieve voltage reduction, thereby charging the supercapacitor C1 in the energy storage circuit 20.

[0069] In this embodiment, the voltage regulating circuit 30 further includes: a third switch S3 and a fourth switch S4;

[0070] The first end of the third switch S3 is connected to the first end of the fourth switch S4 and the second end of the first inductor L1 , and the second end of the fourth switch S4 is connected to the energy storage circuit 20 .

[0071] It should be understood that a boost circuit is formed by the first inductor L1, the third switch K3 and the fourth switch K4. The power supply voltage output by the power supply VIN is boosted by closing and opening the third switch S3 and the fourth switch S4 in combination with the control of the first inductor L1.

[0072] In a specific implementation, during the pulse low level time, the contact of the single-pole double-throw switch SK is connected to the first moving end and the first switch S1 is closed, the third switch S3 is closed, and the power supply VIN outputs the power supply voltage to the first inductor L1 to charge the first inductor L1, and then the third switch S3 is opened and the fourth switch S4 is closed to release the power supply voltage and the energy stored in the first inductor L1 at the same time to achieve voltage boosting, and at the same time, the boosted voltage is used to charge the supercapacitor C1 in the energy storage circuit 20.

[0073] It should be noted that in the prior art, when a voltage regulation circuit regulates the voltage, multiple switches are required. For example, a Buck-Boost circuit needs to use at least four switching tubes and one energy storage element in the voltage boost process, and the voltage reduction process also requires at least four switching tubes and one energy storage element. In this embodiment, the boost process and the voltage reduction process of the power supply voltage can be realized through four switches and one energy storage element, which can improve the utilization rate of switches and energy storage elements.

[0074] In this embodiment, the energy storage circuit 20 includes: a super capacitor C1;

[0075] The first end of the super capacitor C1 is connected to the second end of the fourth switch S4, and the second end of the super capacitor C1 is grounded GND. Figure 3 In the embodiment, the first diode D1 and the first resistor R1 are used as the pulse load circuit for explanation.

[0076] It should be understood that when the vehicle is in use, the energy storage circuit 20 may need to output a large current value in a short period of time. In this embodiment, the super capacitor C1 is used to provide the large current required by the pulse load circuit in a short period of time. Of course, other energy storage elements with large capacity, such as energy storage batteries, etc., can also be used.

[0077] During the pulse low level time, the contact of the single-pole double-throw switch SK is thrown to the first moving end, and after the voltage is regulated by the first inductor L1 and two switches from the first to the fourth switches, the regulated power supply voltage is output to the super capacitor C1 to supply power to the super capacitor C1. During the pulse high level time, the contact of the single-pole double-throw switch SK is thrown to the second moving end, and after the voltage is regulated by the first inductor L1 and two switches from the first to the fourth switches, the regulated pulse voltage is output to the pulse load circuit to supply power to the pulse load circuit.

[0078] Reference Figure 4 In this embodiment, since the single-pole double-throw switch SK is in series with the first switch S1, the single-pole double-throw switch SK can be set to a disconnected state, that is, the single-pole double-throw switch SK is neither connected to the power supply VIN nor to the pulse load. In the case where the single-pole double-throw switch SK has three states, the single-pole double-throw switch SK and the first switch S1 can be directly multiplexed into one single-pole double-throw switch SK. Figure 4 This method can more effectively improve the component utilization efficiency of the entire circuit.

[0079] In this embodiment, the specific component structure in the voltage regulating circuit is limited and the single-pole double-throw switch and the first switch are reused, combined with the first embodiment in which the switch circuit is turned on by time division multiplexing. In the case where the voltage regulating unit is required to regulate the power supply voltage and the pulse voltage, the use of energy storage elements for power supply more effectively improves the use efficiency of the switch elements and reduces resource waste.

[0080] To achieve the above object, the present invention further provides a power supply protection device, which includes the power supply protection circuit as described above. The specific structure of the power supply protection circuit refers to the above embodiment. Since the power supply protection device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0081] To achieve the above purpose, refer to Figure 5 The present invention also provides a power supply protection method, the power supply protection method comprising:

[0082] Step S10: forwardly conducting the switch circuit during the pulse low level time, so that the power supply provides a power supply voltage to the energy storage circuit;

[0083] Step S20: receiving the power supply voltage output by the power supply to store energy in the energy storage circuit;

[0084] Step S30: reversely conduct the switch circuit during the high level time of the pulse;

[0085] Step S40: when the switch circuit is reversely conducted, the energy storage circuit outputs a pulse voltage to the pulse load circuit to supply power to the pulse load circuit.

[0086] It should be noted that the switch circuit is a circuit that controls whether the energy storage circuit and the power supply circuit are turned on according to a certain control sequence. The switch circuit cannot control the energy storage circuit and the power supply circuit to be turned on at the same time. The switch components in the switch circuit can be multi-contact switch components. The energy storage circuit is a circuit connecting the power supply and the energy storage circuit, and the power supply circuit is a circuit connecting the energy storage circuit and the pulse load circuit. The energy storage circuit is a circuit used to store or release energy. When the energy storage circuit is directly connected to the power supply, the energy storage circuit can store energy according to the voltage output by the power supply; when the energy storage circuit is connected to the load, the energy storage circuit can output voltage to the load to power the load. The pulse load circuit is a load circuit that receives a pulse voltage or a pulse circuit. The pulse load circuit may require a large current or voltage to pass through in a short period of time. For example, when the vehicle is ignited and started, the load in the pulse load circuit is an internal combustion engine, and a large current needs to pass through during the ignition process of the internal combustion engine.

[0087] In a specific implementation, the switching circuit can turn on the energy storage circuit between the power supply and the energy storage circuit during the pulse low level time; when the energy storage circuit is turned on, the energy storage circuit receives the power supply voltage output by the power supply to store energy; the switching circuit can also turn on the power supply circuit between the energy storage circuit and the pulse load circuit during the pulse high level time; when the power supply circuit is turned on, the energy storage circuit outputs a pulse voltage to the pulse load circuit through the power supply circuit to power the pulse load circuit.

[0088] Among them, the pulse low level time is the time when the energy storage circuit does not need to provide a pulse voltage to the pulse load circuit, and the pulse high level time is the time when the energy storage circuit needs to provide a pulse voltage to the pulse load circuit. The pulse voltage is the voltage that enables the load in the pulse load circuit to work normally. During the effective time of the pulse, the load can work normally according to the pulse voltage.

[0089] In this embodiment, a power protection method is proposed. The power protection method forwardly conducts the switch circuit during the pulse low level time, so that the power supply provides the power supply voltage for the energy storage circuit; receives the power supply voltage output by the power supply to store energy in the energy storage circuit; reversely conducts the switch circuit during the pulse high level time; when the switch circuit is reversely conducted, the energy storage circuit outputs a pulse voltage to the pulse load circuit to supply power to the pulse load circuit. In this embodiment, a switch circuit is set to connect the energy storage circuit to the power supply and the pulse load circuit respectively, and the switch circuit is turned on in a time-division multiplexing manner to effectively improve the use efficiency of the switch element and reduce resource waste in the process of using the energy storage element for power supply.

[0090] In one embodiment, the step S20 further includes: during the pulse low level time, regulating the power supply voltage output by the power supply, receiving the regulated power supply voltage for energy storage. During the pulse high level time, receiving the pulse voltage output by the energy storage circuit; regulating the pulse voltage, and outputting the regulated pulse voltage to the pulse load circuit.

[0091] In one embodiment, the specific structure of the voltage regulation circuit can also be adjusted. When the voltage regulation unit is required to regulate the power supply voltage and the pulse voltage, the use of energy storage elements for power supply can more effectively improve the use efficiency of the switching elements and reduce resource waste.

[0092] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A power protection circuit, characterized in that: The power protection circuit comprises: a switch circuit, an energy storage circuit and a voltage regulation circuit; Wherein, the energy storage circuit is connected to the power supply and the pulse load circuit respectively through the switch circuit, and the voltage regulating circuit is connected to the switch circuit and the energy storage circuit respectively; The switch circuit is used for forward conduction during the pulse low level time, so that the power supply provides the power supply voltage to the energy storage circuit; The energy storage circuit is used to receive the power supply voltage output by the power supply to store energy; The switch circuit is also used for reverse conduction during the pulse high level time; The energy storage circuit is further used to output a pulse voltage to the pulse load circuit to supply power to the pulse load circuit when the switch circuit is reversely conducting; The voltage regulating circuit is used to regulate the power supply voltage output by the power supply during the pulse low level time, and output the regulated power supply voltage to the energy storage circuit; The energy storage circuit is further used to receive the regulated power supply voltage for energy storage; The voltage regulating circuit is further used to receive the pulse voltage output by the energy storage circuit during the pulse high level time; The voltage regulating circuit is also used to regulate the pulse voltage and output the regulated pulse voltage to the pulse load circuit.

2. The power protection circuit according to claim 1, characterized in that: The switch circuit comprises: a single-pole double-throw switch; Among them, the first moving end of the single-pole double-throw switch is connected to the power supply, the second moving end of the single-pole double-throw switch is connected to the pulse load circuit, and the fixed end of the single-pole double-throw switch is connected to the voltage regulation circuit.

3. The power protection circuit as claimed in claim 2, characterized in that: The voltage regulating circuit comprises: a first inductor, a first switch and a second switch; The first end of the first switch is connected to the fixed end of the single-pole double-throw switch, the second end of the first switch is connected to the first end of the second switch and the first end of the first inductor, the second end of the first inductor is connected to the energy storage circuit, and the second end of the second switch is grounded.

4. The power protection circuit as claimed in claim 3, characterized in that: The voltage regulating circuit further includes: a third switch and a fourth switch; The first end of the third switch is connected to the first end of the fourth switch and the second end of the first inductor, and the second end of the fourth switch is connected to the energy storage circuit.

5. The power protection circuit as claimed in claim 4, characterized in that: The energy storage circuit comprises: a super capacitor; The first end of the super capacitor is connected to the second end of the fourth switch, and the second end of the super capacitor is grounded.

6. A power supply protection device, characterized in that: The power protection device comprises: the power protection circuit according to any one of claims 1-5.

7. A power supply protection system, characterized in that: The power protection system comprises: a power supply, a pulse load circuit and the power protection device according to claim 6, wherein the power protection device is connected to the power supply and the pulse load circuit respectively.

8. A power supply protection method based on the power supply protection system of claim 7, characterized in that: The power protection method comprises: During the pulse low level time, the switch circuit is forwardly turned on, so that the power supply provides a power supply voltage to the energy storage circuit; Receiving the power supply voltage output by the power supply to store energy in the energy storage circuit; The switch circuit is reversely conducted during the high level time of the pulse; When the switch circuit is reversely conducted, the energy storage circuit outputs a pulse voltage to the pulse load circuit to supply power to the pulse load circuit.

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