Charging protection circuit, timer and timer assembly

Abstract

The utility model discloses a charging protection circuit, timer and timer assembly wherein the charging protection circuit comprises a charging power supply access end, a switching circuit and a charging management circuit, the input end of the switching circuit is connected with the charging power supply access end, the output end of the switching circuit is electrically connected with the battery, and the charging management circuit is electrically connected with the charging power supply access end. The charging management circuit is electrically connected with the controlled end of the switching circuit; the charging management circuit detects a charging current output to the battery through the output end of the switching circuit, and controls the switching circuit to disconnect the access between the charging power supply access end and the battery when the charging current reaches a preset first current, so as to protect the charging protection circuit and the battery. Therefore, damage to the charging protection circuit and the battery due to overlarge current caused by short circuit in the charging process of the timer is avoided, the service life of the battery is prolonged, and the safety of a user is ensured at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of timers, and in particular to a charging protection circuit, a timer and a timer component. Background Art

[0002] There are some timers in the prior art that can charge batteries through charging circuits for reuse to reduce energy waste. However, short circuits, overcurrents, overvoltages, undervoltages, etc. that may occur during the charging process of the timer through the charging circuit will cause varying degrees of damage to the charging circuit and the timer battery, affecting the service life of the battery and even endangering the safety of the user. In particular, the current contact charging is also applied to the field of timer technology. Due to the close distance between the contacts, short circuits occur more and more frequently during the charging process of the timer.

[0003] Therefore, there is an urgent need for a circuit that can protect the timer during the charging process. Utility Model Content

[0004] The main purpose of the utility model is to provide a charging protection circuit, which is intended to protect the timer during the charging process.

[0005] To achieve the above object, the utility model provides a charging protection circuit, which is applied to a timer. The timer includes a battery. The charging protection circuit includes:

[0006] A charging power supply access terminal, which is used to access a charging voltage;

[0007] a switch circuit, wherein an input end of the switch circuit is connected to the charging power supply access end, and an output end of the switch circuit is electrically connected to the battery;

[0008] a charging management circuit, the charging management circuit being electrically connected to a controlled end of the switch circuit;

[0009] The charging management circuit is used to detect the charging current output to the battery through the output end of the switch circuit, and when the charging current reaches a preset first current, control the switch circuit to disconnect the path between the charging power supply access end and the battery.

[0010] Optionally, the charging protection circuit further includes the charging management circuit including:

[0011] A current detection circuit, the current detection circuit is used to detect the charging current output from the output end of the switch circuit to the battery, and output a corresponding current value signal;

[0012] A control circuit, the control circuit is electrically connected to the current detection circuit; the control circuit is used to control the switch circuit to disconnect the path between the charging power supply access terminal and the battery when the charging current reaches a preset first current according to the current numerical signal.

[0013] Optionally, the current detection circuit includes:

[0014] a current sensing element, the current sensing element being connected in series in a path between an output terminal of the switch circuit and the battery;

[0015] The control circuit is electrically connected to two ends of the current sensing element respectively; the control circuit is used to detect the voltage drop on the current sensing element, and determine the charging current according to the voltage drop and a preset resistance value.

[0016] Optionally, the current sensing element includes:

[0017] a current sensing resistor, one end of which is connected to the output end of the switch circuit, and the other end of which is connected to the battery;

[0018] The control circuit comprises:

[0019] A power management chip, wherein a first input terminal of the power management chip is connected to a common terminal of a switch circuit and a current sensing resistor, a second input terminal of the power management chip is connected to a common terminal of a current sensing resistor and a battery, and an output terminal of the battery management chip is connected to a controlled terminal of the switch circuit.

[0020] Optionally, the switch circuit includes:

[0021] A switch tube, wherein the input end of the switch tube is connected to the charging power supply access end, the output end of the switch tube is electrically connected to the battery, and the controlled end of the switch tube is connected to the output end of the charging management circuit.

[0022] Optionally, the charging protection circuit further includes:

[0023] A voltage detection circuit, the voltage detection circuit is electrically connected to the charging power supply access terminal and the charging management circuit respectively; the voltage detection circuit is used to detect the voltage value of the charging voltage and output a corresponding voltage value signal;

[0024] The charging management circuit is used to control the switch circuit to disconnect the path between the charging power supply access terminal and the battery when the charging voltage reaches a preset first voltage or is less than a preset second voltage according to the voltage numerical signal.

[0025] Optionally, the charging protection circuit further includes:

[0026] A current limiting circuit, the current limiting circuit is connected in series between the charging power supply access terminal and the input terminal of the switch circuit;

[0027] The current limiting circuit is used to limit the current flowing through itself to below a preset second current;

[0028] and / or;

[0029] The current limiting circuit includes: at least one of a fuse, a fusible link, a self-recovering fuse, and an electronic protection chip.

[0030] The utility model also provides a timer, which comprises a battery and the charging protection circuit as described above.

[0031] Optionally, the timer includes: charging contacts, which are used to connect to a charging base, and when the charging contacts are electrically connected to the charging base, an external voltage is connected through the charging base.

[0032] Optionally, the timer further includes a magnetic member, the charging contacts are spaced apart on the magnetic member, and the magnetic member is used to be magnetically connected to the charging base so that the charging contacts are connected to the charging base.

[0033] The utility model also provides a timer assembly, comprising: a charging base and the timer.

[0034] The technical solution of the utility model adopts a charging protection circuit, which includes a charging power access terminal, a switch circuit and a charging management circuit. The input terminal of the switch circuit is connected to the charging power access terminal, the output terminal of the switch circuit is electrically connected to the battery, and the charging management circuit is electrically connected to the controlled terminal of the switch circuit; the charging management circuit detects the charging current output to the battery through the output terminal of the switch circuit, and when the charging current reaches a preset first current, controls the switch circuit to disconnect the path between the charging power access terminal and the battery, so as to protect the charging protection circuit and the battery, avoid damage to the charging protection circuit and the battery due to excessive current caused by short circuit during the charging process of the timer, extend the service life of the battery, and ensure the safety of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model 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 utility model. 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 This is a schematic diagram of the structure of an embodiment of a charging protection circuit of the utility model;

[0037] Figure 2 This is a schematic diagram of another embodiment of the charging protection circuit of the utility model.

[0038] Figure 3 This is a structural schematic diagram of another embodiment of the charging protection circuit of the utility model;

[0039] Figure 4 This is a structural diagram of another embodiment of the charging protection circuit of the utility model;

[0040] Figure 5 This is a structural schematic diagram of another embodiment of the charging protection circuit of the utility model;

[0041] Figure 6 This is a schematic diagram of the structure of an embodiment of a charging protection circuit of the utility model;

[0042] Figure 7 This is a schematic diagram of the structure of an embodiment of a charging protection circuit of the utility model;

[0043] Figure 8 It is a structural schematic diagram of an embodiment of a charging protection circuit of the utility model.

[0044] Description of Figure Numbers:

[0045]

[0046] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, the descriptions of "first", "second", etc. in the present utility model 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 this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0050] The utility model proposes a charging protection circuit, referring to Figure 1 , Figure 1 This is a schematic diagram of the structure of an embodiment of the charging protection circuit of the utility model, which is applied to a timer. The timer includes a battery 12. It is characterized in that the charging protection circuit includes:

[0051] A charging power supply access terminal 10, wherein the charging power supply access terminal 10 is used to access a charging voltage;

[0052] A switch circuit 11, wherein an input end of the switch circuit 11 is connected to the charging power supply access end 10, and an output end of the switch circuit 11 is electrically connected to the battery 12;

[0053] A charging management circuit 13, wherein the charging management circuit 13 is electrically connected to a controlled end of the switch circuit 11;

[0054] The charging management circuit 13 is used to detect the charging current output to the battery 12 through the output end of the switch circuit 11, and when the charging current reaches a preset first current, control the switch circuit 11 to disconnect the path between the charging power supply access terminal 10 and the battery 12.

[0055] In the embodiment of the utility model, the charging voltage may be a voltage directly provided via an interface, or a voltage provided after the voltage provided via the interface is changed by other charging ICs in the charging circuit.

[0056] refer to Figure 2 In another embodiment of the present utility model, the charging management circuit 13 includes:

[0057] A current detection circuit 131, the current detection circuit 131 is used to detect the charging current output from the output end of the switch circuit 11 to the battery 12, and output a corresponding current value signal;

[0058] The control circuit 132 is electrically connected to the current detection circuit 131; the control circuit 132 is used to control the switch circuit 11 to disconnect the path between the charging power supply access terminal 10 and the battery 12 when the charging current reaches a preset first current according to the current numerical signal.

[0059] In an embodiment of the present invention, the control circuit may be a charging management chip U1, so as to control the switch circuit 11 to disconnect the path between the charging power access terminal 10 and the battery 12 according to a current numerical signal when the charging current reaches a preset first current. The control circuit may also be a main controller of a timer, so as to control the switch circuit 11 to disconnect the path between the charging power access terminal 10 and the battery 12 according to a current numerical signal when the charging current reaches a preset first current. It may also achieve the same effect as the charging management chip U1 in the embodiment of the present invention.

[0060] refer to Figure 3 In another embodiment of the present utility model, the current detection circuit 131 includes:

[0061] A current sensing element 1311, wherein the current sensing element 1311 is connected in series in a path between an output end of the switch circuit 11 and the battery 12;

[0062] The control circuit 132 is electrically connected to two ends of the current sensing element 1311 , respectively; the control circuit 132 is used to detect the voltage drop on the current sensing element 1311 , and determine the charging current according to the voltage drop and a preset resistance value.

[0063] refer to Figure 4 In yet another embodiment of the present utility model, the current sensing element 1311 includes:

[0064] A current sensing resistor R1, one end of the current sensing resistor R1 is connected to the output end of the switch circuit 11, and the other end of the current sensing resistor R1 is connected to the battery 12;

[0065] The control circuit 132 includes:

[0066] A power management chip U1, wherein a first input terminal of the power management chip U1 is connected to a common terminal of a switch circuit 11 and a current sensing resistor R1, a second input terminal of the power management chip U1 is connected to a common terminal of a current sensing resistor R1 and a battery 12, and an output terminal of the battery management chip U1 is connected to an input terminal of the switch circuit 11.

[0067] In this embodiment, the power management chip U1 collects the voltage drop across the current sensing resistor R1, and according to the voltage drop and the resistance value of the current sensing resistor R1, the charging current can be determined by Ohm's law. When the charging current reaches a preset first current, the switch circuit 11 is controlled to disconnect the path between the charging power access terminal 10 and the battery 12 to protect the charging protection circuit and the battery 12. Of course, the current sensing element 1311 in the embodiment of the utility model can also adopt other types of current sensing elements 1311 such as differential resistors and shunts to achieve the same effect as the current sensing resistor R1.

[0068] refer to Figure 5 In another embodiment of the present utility model, the current detection circuit 131 includes:

[0069] The Hall current detection circuit 1312 is used to detect the charging current output from the output end of the switch circuit 11 to the battery 12, and output the corresponding current value signal.

[0070] In this embodiment, the Hall current detection circuit 1312 includes a Hall detection element, which utilizes the fact that when the current passes through a magnetic field perpendicular to the current direction, a potential difference is generated at a position perpendicular to the current and the magnetic field direction. The size of the charging current is indirectly measured by measuring the Hall potential difference. When the charging current reaches a preset first current, the switch circuit 11 is controlled to disconnect the path between the charging power supply access terminal 10 and the battery 12 to perform short-circuit protection on the charging protection circuit and the battery 12.

[0071] Optionally, refer to Figure 6 In one embodiment of the present utility model, the switch circuit comprises:

[0072] The switch tube 14 has an input end connected to the charging power supply access end 10 , an output end of the switch tube 14 electrically connected to the battery 12 , and a controlled end of the switch tube 14 connected to the output end of the charging management circuit 13 .

[0073] Please refer to Figure 7 In one embodiment of this embodiment, the charging protection circuit further includes:

[0074] A voltage detection circuit 15, wherein the voltage detection circuit 15 is electrically connected to the charging power supply access terminal 10 and the charging management circuit 13 respectively; the voltage detection circuit 15 is used to detect the voltage value of the charging voltage and output a corresponding voltage value signal;

[0075] The charging management circuit 13 is used to control the switch circuit 11 to disconnect the path between the charging power supply access terminal 10 and the battery 12 when the charging voltage reaches a preset first voltage or is less than a preset second voltage according to the voltage numerical signal.

[0076] In this embodiment, the voltage detection circuit 15 includes a voltage detection chip, which is connected in series between the charging power supply access terminal 10 and the charging management circuit 13 to collect the voltage value input through the charging power supply terminal and output a corresponding detection signal to the charging management circuit 13. When the voltage value corresponding to the voltage numerical signal received by the charging management circuit 13 is greater than a preset first voltage or less than a preset second voltage, the switch circuit 11 is controlled to disconnect the path between the charging power supply access terminal 10 and the battery 12, so as to perform overvoltage protection and undervoltage protection on the charging protection circuit and the battery 12.

[0077] Optionally, in an embodiment of the present invention, the voltage detection circuit 15 and the charging management circuit 13 are integrated in the same chip.

[0078] Optionally, refer to Figure 8 In one embodiment of the present utility model, the charging protection circuit further includes:

[0079] A current limiting circuit 16, wherein the current limiting circuit 16 is connected in series between the charging power supply input terminal 10 and the input terminal of the switch circuit 11;

[0080] The current limiting circuit 16 is used to limit the current flowing through itself to below a preset second current.

[0081] As a preferred solution but not a limitation, the second current is greater than or equal to the first current. When the charging management circuit is damaged or the detection accuracy is low and the switch circuit 11 is not controlled in time to disconnect the path between the charging power access terminal 10 and the battery 12, the current limiting circuit 16 disconnects the path between the charging power access terminal 10 and the battery 12 to perform overcurrent protection on the charging protection circuit and the battery 12, thereby further ensuring the safety of the timer charging process.

[0082] Optionally, the current limiting circuit includes: at least one of a fuse, a fusible link, a self-recovering fuse, and an electronic protection chip.

[0083] The utility model also provides a timer assembly, comprising: a charging base and the timer.

[0084] The technical solution of the utility model adopts a charging protection circuit, which includes a charging power supply access terminal 10, a switch circuit 11 and a charging management circuit 13. The input terminal of the switch circuit 11 is connected to the charging power supply access terminal 10, the output terminal of the switch circuit 11 is electrically connected to the battery 12, and the charging management circuit 13 is electrically connected to the controlled terminal of the switch circuit 11; the charging management circuit 13 detects the charging current output to the battery 12 through the output terminal of the switch circuit 11, and when the charging current reaches a preset first current, controls the switch circuit 11 to disconnect the path between the charging power supply access terminal 10 and the battery 12, so as to protect the charging protection circuit and the battery 12, avoid damage to the charging protection circuit and the battery 12 due to excessive current caused by short circuit during the charging process of the timer, extend the service life of the battery 12, and ensure the safety of the user.

[0085] The utility model also proposes a timer, which includes a battery and a charging protection circuit. The specific structure of the charging protection circuit refers to the above-mentioned embodiment. Since the timer adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0086] Optionally, the timer includes:

[0087] A plurality of charging interfaces, each of which is used to access an external voltage; and each of which is electrically connected to the charging power supply access terminal.

[0088] Optionally, the plurality of charging interfaces include at least two types of charging interfaces.

[0089] In an embodiment of the utility model, the charging interface can be at least two types of charging interfaces among a USB interface, a lightning interface, a type-c interface and charging contacts. Based on this, the user can select the charging interface required in the current scenario for charging to improve the convenience of charging, and when one or more interfaces are in the charging process, other interfaces can be used for timer data transmission to enhance the customer's usage experience.

[0090] Optionally, the plurality of charging interfaces include: charging contacts, which are used to connect to a charging base, and when the charging contacts are electrically connected to the charging base, an external voltage is connected via the charging base.

[0091] As a preference but not limitation, the charging interface also includes a magnetic part, the charging contacts are fixedly connected to the magnetic part, and the magnetic part is used to magnetically connect to the charging base so that the charging contacts are connected to the charging base. Through the magnetic cooperation between the magnetic part and the charging base, there is no need to align the charging interface when plugging and unplugging the timer when charging. The timer can be automatically positioned and adsorbed by placing it close to the charging base, and the operation is simple and convenient.

[0092] Optionally, the charging contacts are spaced apart on the magnetic part, so that during the charging process of the timer, the charging contacts are not easily short-circuited due to being touched by conductive objects such as tacks, pins, and pen tips, thereby further ensuring the safety of the timer.

[0093] The utility model also proposes a timer assembly, including: a charging base and the timer. The specific structure of the timer refers to the above-mentioned embodiment. Since the timer assembly adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0094] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A charging protection circuit, applied to a timer, the timer comprising a battery, characterized in that: The charging protection circuit comprises: A charging power supply access terminal, which is used to access a charging voltage; a switch circuit, wherein an input end of the switch circuit is connected to the charging power supply access end, and an output end of the switch circuit is electrically connected to the battery; A charging management circuit, the charging management circuit being electrically connected to a controlled end of the switch circuit; The charging management circuit is used to detect the charging current output to the battery through the output end of the switch circuit, and when the charging current reaches a preset first current, control the switch circuit to disconnect the path between the charging power supply access end and the battery.

2. The charging protection circuit according to claim 1, characterized in that: The charging management circuit also includes: A current detection circuit, the current detection circuit is used to detect the charging current output from the output end of the switch circuit to the battery, and output a corresponding current value signal; A control circuit, the control circuit is electrically connected to the current detection circuit; the control circuit is used to control the switch circuit to disconnect the path between the charging power supply access terminal and the battery when the charging current reaches a preset first current according to the current numerical signal.

3. The charging protection circuit according to claim 2, characterized in that: The current detection circuit comprises: a current sensing element, the current sensing element being connected in series in a path between an output terminal of the switch circuit and the battery; The control circuit is electrically connected to two ends of the current sensing element respectively; the control circuit is used to detect the voltage drop on the current sensing element, and determine the charging current according to the voltage drop and a preset resistance value.

4. The charging protection circuit according to claim 3, characterized in that: The current sensing element comprises: a current sensing resistor, one end of which is connected to the output end of the switch circuit, and the other end of which is connected to the battery; The control circuit comprises: A power management chip, wherein a first input terminal of the power management chip is connected to a common terminal of a switch circuit and a current sensing resistor, a second input terminal of the power management chip is connected to a common terminal of a current sensing resistor and a battery, and an output terminal of the battery management chip is connected to a controlled terminal of the switch circuit.

5. The charging protection circuit according to claim 1, characterized in that: The switch circuit comprises: A switch tube, wherein the input end of the switch tube is connected to the charging power supply access end, the output end of the switch tube is electrically connected to the battery, and the controlled end of the switch tube is connected to the output end of the charging management circuit.

6. The charging protection circuit according to any one of claims 1 to 5, characterized in that: The charging protection circuit also includes: A voltage detection circuit, the voltage detection circuit is electrically connected to the charging power supply access terminal and the charging management circuit respectively; the voltage detection circuit is used to detect the voltage value of the charging voltage and output a corresponding voltage value signal; The charging management circuit is used to control the switch circuit to disconnect the path between the charging power supply access terminal and the battery when the charging voltage reaches a preset first voltage or is less than a preset second voltage according to the voltage numerical signal.

7. The charging protection circuit according to any one of claims 1 to 5, characterized in that: The charging protection circuit also includes: A current limiting circuit, the current limiting circuit is connected in series between the charging power supply access terminal and the input terminal of the switch circuit; The current limiting circuit is used to limit the current flowing through itself to below a preset second current; and / or; The current limiting circuit includes: at least one of a fuse, a fusible link, a self-recovering fuse, and an electronic protection chip.

8. A timer, characterized in that: The timer comprises a battery and a charging protection circuit as described in any one of claims 1-7.

9. The timer according to claim 8, characterized in that The timer includes: a charging contact, wherein the charging contact is used to connect to a charging base, and when the charging contact is electrically connected to the charging base, an external voltage is connected via the charging base.

10. The timer according to claim 9, characterized in that The timer also includes a magnetic member, the charging contacts are arranged at intervals on the magnetic member, and the magnetic member is used to be magnetically connected to the charging base so that the charging contacts are connected to the charging base.

11. A timer assembly, characterized in that: include: A charging stand and a timer as claimed in any one of claims 8 to 10.

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