Locking and unlocking circuit of pulse type electronic lock

Abstract

The utility model relates to the technical field of electronic locks, and discloses a locking and unlocking circuit of a pulse type electronic lock, which comprises a locking circuit and an unlocking circuit consisting of a quick power-on circuit and a delay comparison circuit, a short-time forward pulse voltage is continuously provided for locking of the electronic lock through energy storage of the added delay comparison circuit during driving of locking, and a short-time reverse pulse voltage is provided for unlocking of the electronic lock through an energy storage element of the unlocking circuit during driving of unlocking. Therefore, the reliability, durability and safety of the electronic lock system are improved, an emergency unlocking mechanism under special working conditions (such as a power failure condition) is also considered, so that a user can safely and efficiently complete charging operation, potential safety risks are reduced, and the overall progress and popularization of an electric vehicle charging technology are promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic locks, in particular to a locking and unlocking circuit of a pulse-type electronic lock. Background Art

[0002] When charging electric vehicles, charging guns with electronic locks are typically used, requiring rigorous and detailed operating procedures and safety requirements. Specifically, the built-in electronic lock in the charging gun must remain securely locked throughout the charging process to prevent it from accidentally falling off due to the gun's own weight, external environmental factors, or improper operation. This could interfere with charging operations and even cause safety accidents.

[0003] Currently on the market, the electronic locks equipped with charging guns are mainly divided into two categories: magnetic holding type and pulse type. Magnetic holding electronic locks rely on continuous power supply to maintain the locked state, which increases energy consumption to a certain extent; while pulse electronic locks only require pulse voltage drive for a moment when performing locking and unlocking actions, and do not require power at other times, thus showing significant advantages in energy efficiency. However, electronic lock systems that use pulse voltage control have strict requirements on the driving time. Irrational control logic will cause circuit components to burn out or the electronic lock to heat up and burn out, which will cause the charging gun to be unable to successfully unlock the state, affecting normal use. In addition, pulse electronic locks do not have an automatic unlocking function when the power is interrupted. Manual operation is required to unlock the lock. This process requires professional operating skills and cannot be performed by non-professionals.

[0004] In view of this, it is particularly urgent to optimize and improve the existing charging gun electronic lock technology.

[0005] The above information is presented as background information only to assist with an understanding of the present disclosure and is not a determination or admission that any of the above may be applicable as prior art with respect to the present disclosure. Utility Model Content

[0006] The utility model provides a locking and unlocking circuit of a pulse type electronic lock to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A locking and unlocking circuit for a pulse-type electronic lock, connected between a power supply and the electronic lock, includes a locking circuit and an unlocking circuit; wherein,

[0009] The locking circuit includes a fast power-on circuit and a delay comparison circuit;

[0010] The fast power-on circuit is connected between the power supply and the electronic lock, and is used to provide a forward voltage to the electronic lock when a locking signal is received and the power supply is supplied;

[0011] The time delay comparison circuit is connected between the power supply and the electronic lock, and is used to store energy during the locking process and when the power supply is supplying power, and use the stored energy to disconnect the forward voltage of the electronic lock; the fast power-on circuit and the time delay comparison circuit cooperate to provide a short-term forward pulse voltage to the electronic lock to continue to drive the electronic lock to lock;

[0012] The unlocking circuit is connected between the power supply and the electronic lock, and includes an energy storage element, which is used to store energy during the locking process; when an unlocking signal is received, the power supply will stop supplying power, and the energy storage element will provide a short-term reverse pulse voltage to the electronic lock to drive the electronic lock to unlock; and when the power supply stops supplying power unexpectedly, the energy storage element will provide a short-term reverse pulse voltage to the electronic lock to drive the electronic lock to unlock.

[0013] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the fast power-on circuit includes a second resistor R2, a fourth diode D4, a seventh resistor R7, a fourth resistor R4, a first MOS transistor Q1, a ninth diode D9 and a first TVS diode D1;

[0014] One end of the second resistor R2 is connected to the power supply, and the other end is connected to the anode of the fourth diode D4;

[0015] The cathode of the fourth diode D4 is connected to the seventh resistor R7 and the fourth resistor R4 connected in series;

[0016] The free end of the fourth resistor R4 is grounded;

[0017] The gate of the first MOS transistor Q1 is connected to the connection node of the seventh resistor R7 and the fourth resistor R4, the source of the first MOS transistor Q1 is grounded, and the drain of the first MOS transistor Q1 is connected to the negative input terminal of the electronic lock;

[0018] The anode of the ninth diode D9 is connected to the power supply, and the cathode of the ninth diode D9 is connected to the positive input terminal of the electronic lock;

[0019] The first TVS diode D1 is connected between the negative input terminal and the positive input terminal of the electronic lock.

[0020] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the fast power-on circuit further includes a first capacitor C1;

[0021] The first capacitor C1 is connected in parallel across the fourth resistor R4.

[0022] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the delay comparison circuit includes a first resistor R1, a fifth resistor R5, a delay electrolytic capacitor C3 and an operational amplifier U1;

[0023] The first resistor R1 and the fifth resistor R5 are connected in series, one end of which is connected to the power supply, and the other end is grounded;

[0024] The delay electrolytic capacitor C3 is connected in parallel to both ends of the fifth resistor R5;

[0025] The inverting input terminal of the operational amplifier U1 is connected to the connection node of the first resistor R1 and the fifth resistor R5, the non-inverting input terminal of the operational amplifier U1 is connected to the connection node of the second resistor R2 and the fourth diode D4, and the output terminal of the operational amplifier U1 is connected to the cathode of the fourth diode D4.

[0026] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the delay comparison circuit further includes a third resistor R3;

[0027] One end of the third resistor R3 is connected to the connection node of the second resistor R2 and the non-inverting input terminal of the operational amplifier U1 , and the other end is grounded.

[0028] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the delay comparison circuit further includes a third diode D3;

[0029] An anode of the third diode D3 is connected to a connection point between the second resistor R2 and the power supply, and a cathode of the third diode D3 is connected to an inverting input terminal of the operational amplifier U1 .

[0030] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the delay comparison circuit further includes a sixth resistor R6;

[0031] The sixth resistor R6 is connected in series to the inverting input terminal of the operational amplifier U1.

[0032] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the delay comparison circuit further includes a second TVS diode D2 and a second capacitor C2;

[0033] The second TVS diode D2 is connected between the power supply and the ground;

[0034] The second capacitor C2 is connected in parallel to both ends of the second TVS diode D2.

[0035] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the unlocking circuit includes a relay RYL1, a freewheeling diode D6, an eighth diode D8, a thermistor R8, a seventh diode D7 and an energy storage capacitor C5 as the energy storage element;

[0036] One end of the coil of the relay RYL1 is connected to the power supply, and the other end is grounded;

[0037] The freewheeling diode D6 is connected in parallel to both ends of the coil of the relay RYL1;

[0038] The normally closed contact 3 of the relay RYL1 is connected to the positive input terminal of the electronic lock, the normally closed contact 6 of the relay RYL1 is connected to the anode of the eighth diode D8, the normally open contact 4 of the relay RYL1 is grounded, and the normally open contact 5 of the relay RYL1 is connected to one end of the thermistor R8;

[0039] The other end of the thermistor R8 is connected to the cathode of the seventh diode D7;

[0040] The anode of the seventh diode D7 is connected to the power supply;

[0041] The cathode of the eighth diode D8 is connected to the negative input terminal of the electronic lock;

[0042] One end of the energy storage capacitor C5 is connected to the positive input terminal of the electronic lock via the normally closed contact 3 of the relay RYL1, and the other end is connected to the negative input terminal of the electronic lock via the normally closed contact 6 of the relay RYL1 and the eighth diode D8.

[0043] Furthermore, in the locking and unlocking circuit of the pulse-type electronic lock, the energy storage capacitor C5 is an electrolytic capacitor or a supercapacitor.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The utility model provides a locking and unlocking circuit for a pulse-type electronic lock, including a locking circuit and an unlocking circuit composed of a fast power-on circuit and a delay comparison circuit. The increased energy storage of the delay comparison circuit continues to provide a short-term positive pulse voltage for locking the electronic lock when driving the lock, and the energy storage element of the unlocking circuit provides a short-term reverse pulse voltage for unlocking the electronic lock when driving the unlock. This not only improves the reliability, durability and safety of the electronic lock system, but also takes into account the emergency unlocking mechanism under special working conditions (such as power failure), so as to ensure that users can complete the charging operation safely and efficiently, while reducing potential safety risks, which is conducive to promoting the overall progress and popularization of electric vehicle charging technology.

[0046] The present invention has other features and advantages, which will be apparent from the accompanying drawings and subsequent detailed descriptions incorporated herein, or will be described in detail in the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 these drawings without paying any creative work.

[0048] Figure 1 This is a schematic structural diagram of a locking and unlocking circuit of a pulse-type electronic lock provided by an embodiment of the present utility model;

[0049] Figure 2 This is a schematic diagram of the circuit principle of the fast power-on circuit and the delay comparison circuit provided by the embodiment of the utility model;

[0050] Figure 3 This is a schematic diagram of the circuit principle of the unlocking circuit provided by an embodiment of the present utility model.

[0051] Reference numerals:

[0052] Lock circuit 1, unlock circuit 2;

[0053] Fast power-on circuit 11, delay comparison circuit 12. DETAILED DESCRIPTION

[0054] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0055] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0056] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0057] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0058] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0059] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0060] In this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise specifically limited.

[0061] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0062] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0063] In view of the aforementioned deficiencies in the prior art, the applicant, drawing upon years of extensive practical experience and expertise in this field, combined with the application of academic theory, has actively engaged in research and innovation, hoping to create a technology that can address these deficiencies. Through continuous research and design, and through repeated trial production and improvements, the applicant has finally created the present utility model, which possesses truly practical value.

[0064] Please refer to Figure 1 This embodiment of the utility model provides a pulsed locking and unlocking circuit for an electronic lock. This circuit is connected between the power supply (VCC) and the electronic lock, aiming to achieve efficient and stable locking and unlocking functions. The system includes a locking circuit 1 and an unlocking circuit 2, which work together to ensure the security and reliability of the electronic lock.

[0065] Specifically, the locking circuit module 1 is further divided into a fast power-on circuit unit 11 and a delay comparison circuit unit 12 , which each perform their respective functions and jointly promote the smooth completion of the locking process.

[0066] The fast power-on circuit 11, serving as the initial driving force for the locking process, is connected between the power supply and the electronic lock. When a clear locking finger signal is received and the power supply is continuously supplied, the circuit can respond quickly and provide a positive voltage for the electronic lock.

[0067] The delay comparator circuit 12 plays a crucial role in the locking process. It is also connected between the power supply and the electronic lock, but its primary function is energy storage and delayed power supply. During the locking process, this circuit actively stores electrical energy and uses this stored energy to provide the necessary short-term positive pulse voltage for the electronic lock during the lock's activation time. The fast power-on circuit 11 and the delay comparator circuit 12 work together to continue providing the short-term positive pulse voltage to the electronic lock, thereby continuing to lock it.

[0068] The design of the unlocking circuit 2 is equally ingenious. It is also located between the power supply and the electronic lock and contains an energy storage element that is specifically responsible for the unlocking operation. During the locking process, the energy storage element is used to store energy; when an unlocking signal is received, the power supply will stop supplying power, and the energy storage element will provide a short-term reverse pulse voltage to the electronic lock to activate the unlocking mechanism and achieve smooth unlocking of the electronic lock. In addition, the unlocking circuit can also cope with the situation where the power supply stops supplying power unexpectedly, using the energy storage element to provide a short-term reverse pulse voltage to the electronic lock to drive the electronic lock to unlock. This ensures that the necessary unlocking pulse voltage can be provided to the electronic lock even when the power supply is unstable, ensuring the smooth unlocking operation.

[0069] In summary, the core of the improvements introduced in this embodiment lies in the clever addition of delay comparison circuit 12 and an energy storage mechanism in unlocking circuit 2, which achieves dual protection during the locking and unlocking processes of the electronic lock. This not only significantly improves the overall performance of the electronic lock system, including reliability, durability, and safety, but also fully considers the various challenges and risks that may be encountered in practical applications, providing users with a safer, more convenient, and more efficient charging experience. This technological breakthrough will undoubtedly have a positive impact on the further development and popularization of electric vehicle charging technology.

[0070] Please refer to Figure 2 In one implementation of this embodiment, the fast power-on circuit 11 includes a second resistor R2, a fourth diode D4, a seventh resistor R7, a fourth resistor R4, a first MOS transistor Q1, a ninth diode D9 and a first TVS diode D1;

[0071] One end of the second resistor R2 is connected to the power supply, and the other end is connected to the anode of the fourth diode D4;

[0072] The cathode of the fourth diode D4 is connected to the seventh resistor R7 and the fourth resistor R4 connected in series;

[0073] The free end of the fourth resistor R4 is grounded;

[0074] The gate of the first MOS transistor Q1 is connected to the connection node of the seventh resistor R7 and the fourth resistor R4, the source of the first MOS transistor Q1 is grounded, and the drain of the first MOS transistor Q1 is connected to the negative input terminal of the electronic lock;

[0075] The anode of the ninth diode D9 is connected to the power supply, and the cathode of the ninth diode D9 is connected to the positive input terminal of the electronic lock;

[0076] The first TVS diode D1 is connected between the negative input terminal and the positive input terminal of the electronic lock to prevent surge impact.

[0077] Assumptions Figure 2 The second resistor R2, the third resistor R3, and the fourth resistor R4 have the same resistance value and are much larger than the seventh resistor R7 (current-limiting resistor). Therefore, the input voltage VGS of the gate of the first MOS transistor Q1 is larger than the conduction threshold voltage of the first MOS transistor Q1. The drain and source of the first MOS transistor Q1 are turned on, and the drain voltage is pulled down to the power ground. Therefore, the two ends of the electronic lock motor have a positive voltage, and the power is turned on.

[0078] In one implementation of this embodiment, the fast power-on circuit 11 further includes a first capacitor C1;

[0079] The first capacitor C1 is connected in parallel across the fourth resistor R4.

[0080] Please refer again Figure 2 In one implementation of this embodiment, the delay comparison circuit 12 includes a first resistor R1, a fifth resistor R5, a delay electrolytic capacitor C3 and an operational amplifier U1;

[0081] The first resistor R1 and the fifth resistor R5 are connected in series, one end of which is connected to the power supply, and the other end is grounded;

[0082] The delay electrolytic capacitor C3 is connected in parallel to both ends of the fifth resistor R5;

[0083] The inverting input terminal of the operational amplifier U1 is connected to the connection node of the first resistor R1 and the fifth resistor R5, the non-inverting input terminal of the operational amplifier U1 is connected to the connection node of the second resistor R2 and the fourth diode D4, and the output terminal of the operational amplifier U1 is connected to the cathode of the fourth diode D4.

[0084] It should be noted that the pulse-type electronic lock needs to lock (positive voltage) or unlock (negative voltage) within a certain pulse time, and then maintain zero level until another set of unlocking or locking pulse voltage arrives.

[0085] The delay electrolytic capacitor C3 needs to be selected so that its charging time can meet the driving time of the electronic lock. After the delay electrolytic capacitor C3 is charged, the voltage across it is equal to the voltage across the fifth resistor R5.

[0086] In one implementation of this embodiment, the delay comparison circuit 12 further includes a third resistor R3;

[0087] One end of the third resistor R3 is connected to the connection node of the second resistor R2 and the non-inverting input terminal of the operational amplifier U1 , and the other end is grounded.

[0088] It is understandable that in order to simplify the picture, Figure 2 The power supply of the operational amplifier U1 is omitted.

[0089] The inverting input voltage of operational amplifier U1 is V-, and the non-inverting input voltage is V+. In this circuit, operational amplifier U1 has no negative feedback and acts as a comparator. The resistance values of the voltage divider resistors (i.e., the first resistor R1, the fifth resistor R5, the third resistor R3, and the second resistor R2) can be calculated so that V- > V+ (V- is the voltage at the inverting input of operational amplifier U1, and V+ is the voltage at the non-inverting input of operational amplifier U1). This results in the operational amplifier output being -V-, and the operational amplifier operates as a push-pull output. In summary, the final gate voltage of the first MOS transistor Q1 is the superposition of -V- and VGS, with |V-| > |VGS|. Therefore, once the delay electrolytic capacitor C3 is fully charged, the first MOS transistor Q1 will be turned off, disconnecting the negative terminal of the electronic lock, de-energizing the electronic lock, and locking the electronic lock within the actuation time.

[0090] In one implementation of this embodiment, the delay comparison circuit 12 further includes a third diode D3;

[0091] An anode of the third diode D3 is connected to a connection point between the second resistor R2 and the power supply, and a cathode of the third diode D3 is connected to an inverting input terminal of the operational amplifier U1 .

[0092] In one implementation of this embodiment, the delay comparison circuit 12 further includes a sixth resistor R6;

[0093] The sixth resistor R6 is connected in series to the inverting input terminal of the operational amplifier U1.

[0094] In one implementation of this embodiment, the delay comparison circuit 12 further includes a second TVS diode D2 and a second capacitor C2;

[0095] The second TVS diode D2 is connected between the power supply and the ground;

[0096] The second capacitor C2 is connected in parallel to both ends of the second TVS diode D2.

[0097] Please refer to Figure 3 In one implementation of this embodiment, the unlocking circuit 2 includes a relay RYL1, a freewheeling diode D6, an eighth diode D8, a thermistor R8, a seventh diode D7 and an energy storage capacitor C5 as the energy storage element;

[0098] One end of the coil of the relay RYL1 is connected to the power supply, and the other end is grounded;

[0099] The freewheeling diode D6 is connected in parallel to both ends of the coil of the relay RYL1;

[0100] The normally closed contact 3 of the relay RYL1 is connected to the positive input terminal of the electronic lock, the normally closed contact 6 of the relay RYL1 is connected to the anode of the eighth diode D8, the normally open contact 4 of the relay RYL1 is grounded, and the normally open contact 5 of the relay RYL1 is connected to one end of the thermistor R8;

[0101] The other end of the thermistor R8 is connected to the cathode of the seventh diode D7;

[0102] The anode of the seventh diode D7 is connected to the power supply;

[0103] The cathode of the eighth diode D8 is connected to the negative input terminal of the electronic lock;

[0104] One end of the energy storage capacitor C5 is connected to the positive input terminal of the electronic lock via the normally closed contact 3 of the relay RYL1, and the other end is connected to the negative input terminal of the electronic lock via the normally closed contact 6 of the relay RYL1 and the eighth diode D8.

[0105] It is understandable that Figure 3 The circuit in the dotted box is a part of the fast power-on circuit.

[0106] During charging, relay RYL1 is turned on, normally closed contacts 6 and 3 are disconnected, normally open contacts 4 and 5 are closed, and the power supply Vcc charges the energy storage capacitor C5.

[0107] When the system suddenly loses power or an unlock command is applied during charging, the voltage of the power supply Vcc will drop rapidly. The voltage across the electrolytic capacitor C3 in the locking circuit drops slower than Vcc. The voltage across the two input terminals of the operational amplifier U1 still maintains V->V+, that is, the voltage across the inverting input terminal is greater than the non-inverting input terminal. The operational amplifier outputs a negative voltage. This negative voltage is superimposed on the voltage across the fourth resistor R4 after power failure, and the first MOS transistor Q1 is still cut off.

[0108] When Vcc drops below the level required to drive the coil of relay RYL1, relay RYL1 returns to its unpowered initial state. Current from the positive electrode of energy storage capacitor C5 flows through normally closed contact 6 of relay RYL1 and then through eighth diode D8 into the negative input terminal LOCK- of the electronic lock. After passing through the motor, the current flows out of the positive input terminal LOCK+ of the electronic lock and returns to the negative electrode of energy storage capacitor C5 through normally closed contact 3. The voltage across the electronic lock is negative, driving current flows through the motor, and the electronic lock is unlocked.

[0109] The unlocking process in the charging stop scenario is the same as above, except that the control board controls Vcc power off.

[0110] When the electronic lock motor is driven, the operating voltage must be maintained above a certain value (assuming 10V), and the driving current I m Reach a certain value, the driving time is t m , then the capacitance of the energy storage capacitor is approximately: .

[0111] In one implementation of this embodiment, the energy storage capacitor C5 is an electrolytic capacitor or a supercapacitor.

[0112] The first MOS transistor Q1 is not limited to an N-channel MOS, and can be replaced with a P-channel MOS to fine-tune the circuit to achieve its function.

[0113] In addition, relay RYL1 can also be connected using a multi-channel optocoupler to form an equivalent circuit.

[0114] Although the terms "electronic lock," "pulse," and "lock" are frequently used in this application, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0115] The utility model provides a locking and unlocking circuit for a pulse-type electronic lock, including a locking circuit and an unlocking circuit composed of a fast power-on circuit and a delay comparison circuit. The increased energy storage of the delay comparison circuit continues to provide a short-term positive pulse voltage for locking the electronic lock when driving the lock, and the energy storage element of the unlocking circuit provides a short-term reverse pulse voltage for unlocking the electronic lock when driving the unlock. This not only improves the reliability, durability and safety of the electronic lock system, but also takes into account the emergency unlocking mechanism under special working conditions (such as power failure), so as to ensure that users can complete the charging operation safely and efficiently, while reducing potential safety risks, which is conducive to promoting the overall progress and popularization of electric vehicle charging technology.

[0116] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A locking and unlocking circuit for a pulse-type electronic lock, connected between a power supply and an electronic lock, characterized in that: It includes a locking circuit (1) and an unlocking circuit (2); wherein, The locking circuit (1) includes a fast power-on circuit (11) and a delay comparison circuit (12); The fast power-on circuit (11) is connected between the power supply and the electronic lock, and is used to provide a forward voltage to the electronic lock when a locking signal is received and the power supply is powered; The time delay comparison circuit (12) is connected between the power supply and the electronic lock, and is used to store energy during the locking process and when the power supply is supplied, and to use the stored energy to disconnect the forward voltage of the electronic lock; the fast power-on circuit and the time delay comparison circuit cooperate to continue to provide a short-time forward pulse voltage to the electronic lock, so as to continue to drive the electronic lock to lock; The unlocking circuit (2) is connected between the power supply and the electronic lock, and includes an energy storage element for storing energy during the locking process; when an unlocking signal is received, the power supply stops supplying power, and the energy storage element provides a short-term reverse pulse voltage to the electronic lock to drive the electronic lock to unlock; and when the power supply stops supplying power unexpectedly, the energy storage element provides a short-term reverse pulse voltage to the electronic lock to drive the electronic lock to unlock.

2. The locking and unlocking circuit of the pulse type electronic lock according to claim 1, characterized in that: The fast power-on circuit (11) comprises a second resistor R2, a fourth diode D4, a seventh resistor R7, a fourth resistor R4, a first MOS transistor Q1, a ninth diode D9 and a first TVS diode D1; One end of the second resistor R2 is connected to the power supply, and the other end is connected to the anode of the fourth diode D4; The cathode of the fourth diode D4 is connected to the seventh resistor R7 and the fourth resistor R4 connected in series; The free end of the fourth resistor R4 is grounded; The gate of the first MOS transistor Q1 is connected to the connection node of the seventh resistor R7 and the fourth resistor R4, the source of the first MOS transistor Q1 is grounded, and the drain of the first MOS transistor Q1 is connected to the negative input terminal of the electronic lock; The anode of the ninth diode D9 is connected to the power supply, and the cathode of the ninth diode D9 is connected to the positive input terminal of the electronic lock; The first TVS diode D1 is connected between the negative input terminal and the positive input terminal of the electronic lock.

3. The locking and unlocking circuit of the pulse type electronic lock according to claim 2, characterized in that: The fast power-on circuit (11) further includes a first capacitor C1; The first capacitor C1 is connected in parallel across the fourth resistor R4.

4. The locking and unlocking circuit of the pulse type electronic lock according to claim 2, characterized in that: The delay comparison circuit (12) comprises a first resistor R1, a fifth resistor R5, a delay electrolytic capacitor C3 and an operational amplifier U1; The first resistor R1 and the fifth resistor R5 are connected in series, one end of which is connected to the power supply, and the other end is grounded; The delay electrolytic capacitor C3 is connected in parallel to both ends of the fifth resistor R5; The inverting input terminal of the operational amplifier U1 is connected to the connection node of the first resistor R1 and the fifth resistor R5, the non-inverting input terminal of the operational amplifier U1 is connected to the connection node of the second resistor R2 and the fourth diode D4, and the output terminal of the operational amplifier U1 is connected to the cathode of the fourth diode D4.

5. The locking and unlocking circuit of the pulse type electronic lock according to claim 4, characterized in that: The delay comparison circuit (12) further includes a third resistor R3; One end of the third resistor R3 is connected to the connection node of the second resistor R2 and the non-inverting input terminal of the operational amplifier U1 , and the other end is grounded.

6. The locking and unlocking circuit of the pulse type electronic lock according to claim 4, characterized in that: The delay comparison circuit (12) further includes a third diode D3; An anode of the third diode D3 is connected to a connection point between the second resistor R2 and the power supply, and a cathode of the third diode D3 is connected to an inverting input terminal of the operational amplifier U1 .

7. The locking and unlocking circuit of the pulse type electronic lock according to claim 4, characterized in that: The delay comparison circuit (12) further includes a sixth resistor R6; The sixth resistor R6 is connected in series to the inverting input terminal of the operational amplifier U1.

8. The locking and unlocking circuit of the pulse type electronic lock according to claim 4, characterized in that: The delay comparison circuit (12) further includes a second TVS diode D2 and a second capacitor C2; The second TVS diode D2 is connected between the power supply and the ground; The second capacitor C2 is connected in parallel to both ends of the second TVS diode D2.

9. The locking and unlocking circuit of the pulse type electronic lock according to claim 1, characterized in that: The unlocking circuit (2) includes a relay RYL1, a freewheeling diode D6, an eighth diode D8, a thermistor R8, a seventh diode D7 and an energy storage capacitor C5 as the energy storage element; One end of the coil of the relay RYL1 is connected to the power supply, and the other end is grounded; The freewheeling diode D6 is connected in parallel to both ends of the coil of the relay RYL1; The normally closed contact 3 of the relay RYL1 is connected to the positive input terminal of the electronic lock, the normally closed contact 6 of the relay RYL1 is connected to the anode of the eighth diode D8, the normally open contact 4 of the relay RYL1 is grounded, and the normally open contact 5 of the relay RYL1 is connected to one end of the thermistor R8; The other end of the thermistor R8 is connected to the cathode of the seventh diode D7; The anode of the seventh diode D7 is connected to the power supply; The cathode of the eighth diode D8 is connected to the negative input terminal of the electronic lock; One end of the energy storage capacitor C5 is connected to the positive input terminal of the electronic lock via the normally closed contact 3 of the relay RYL1, and the other end is connected to the negative input terminal of the electronic lock via the normally closed contact 6 of the relay RYL1 and the eighth diode D8.

10. The locking and unlocking circuit of the pulse type electronic lock according to claim 9, characterized in that: The energy storage capacitor C5 is an electrolytic capacitor or a super capacitor.

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