Power supply protection circuit and electric equipment

Abstract

The utility model discloses a power supply protection circuit and electric equipment, and particularly relates to the technical field of power supply protection. The power supply protection circuit is connected in series between a start button and a power supply module, and comprises a switch module which is connected with the power supply module and is used for connecting or disconnecting the power supply module; and the protection module is connected with the switch module and the start button and is used for controlling the switch module to disconnect the power supply module when the start button is short-circuited, so that the power supply module stops supplying power. A power protection circuit is arranged between a start button and a power supply module, so that a protection module in the power protection circuit controls a switch module to disconnect the power supply module under the condition that the start button is short-circuited, and the power supply module stops supplying power; therefore, the power supply module is prevented from being always in a discharge state due to short circuit or non-jumping of the start button, the use loss of the power supply module is reduced, and the service life of the electric equipment is further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply protection, in particular to a power supply protection circuit and an electrical device. Background Art

[0002] In the energy storage industry, due to the mechanical wear of the start button, it is easy to cause abnormalities in the start button. For example, the start button short-circuits and does not jump, causing the battery in the electrical equipment to be in a discharged state all the time, thus affecting the service life of the electrical equipment. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is that the start button does not trip due to a short circuit, causing the power supply module in the electrical equipment to be in a discharging state all the time, thereby affecting the service life of the electrical equipment.

[0004] According to a first aspect, the present application provides a power protection circuit, wherein the power protection circuit is connected in series between a start button and a power supply module, and the power protection circuit comprises:

[0005] A switch module, connected to the power supply module, for connecting or disconnecting the power supply module;

[0006] The protection module is connected with the switch module and the start button, and is used to control the switch module to disconnect the power supply module when the start button is short-circuited, so that the power supply module stops supplying power.

[0007] Optionally, the protection module includes: a first capacitor, a first end of the first capacitor is connected to the start button, and a second end of the first capacitor is connected to the switch module.

[0008] Optionally, the switch module includes: a switch device, a first end of the switch device is connected to the protection module, a second end of the switch device is connected to the power supply, and a third end of the switch device is connected to the power supply module.

[0009] Optionally, the switching device is a PNP transistor.

[0010] Optionally, the switch module also includes: a first resistor, a second resistor and a first diode; the first end of the first resistor is connected to the power supply, and the second end of the first resistor is respectively connected to the first end of the switch device and the protection module; the first end of the second resistor is connected to the third end of the switch device, the second end of the second resistor is connected to the first end of the first diode, and the second end of the first diode is connected to the power supply module.

[0011] Optionally, the power protection circuit further includes:

[0012] The adjustment module is connected with the protection module and the start button, and is used to adjust the response time of the protection module controlling the switch module to connect or disconnect the power supply module.

[0013] Optionally, the adjustment module includes: a third resistor, a fourth resistor and a second capacitor, the first end of the third resistor and the first end of the fourth resistor are respectively connected to the protection module and the start button, the second end of the third resistor is connected to the power supply, the second end of the fourth resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

[0014] Optionally, the power protection circuit further includes:

[0015] A fifth resistor and a second diode, wherein a first end of the fifth resistor is connected to the start button, a second end of the fifth resistor is connected to a first end of the second diode, and a second end of the second diode is grounded.

[0016] According to a second aspect, the present application provides an electrical device, comprising any of the power protection circuits described above.

[0017] Optionally, the electrical equipment further includes:

[0018] Power supply module, start button and at least two LED lights;

[0019] The control module is respectively connected to at least two LED lights, a power protection circuit, and a power supply module. The power protection circuit is connected to a start button. The control module is used to control the on and off of at least two LED lights to indicate the power consumption of the electrical equipment when the start button is turned on and the electrical equipment is in normal power supply.

[0020] The embodiment of the present application has the following advantages:

[0021] By setting a power protection circuit between the start button and the power supply module, when the start button is short-circuited, the protection module in the power protection circuit controls the switch module to disconnect the power supply module, so that the power supply module stops supplying power, thereby preventing the power supply module from being in a discharging state due to the start button short-circuiting or not tripping, slowing down the use loss of the power supply module, and further extending the service life of the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a power protection circuit provided for the implementation of this application.

[0024] Figure 2 A schematic diagram of the circuit structure of a power protection circuit provided for the implementation of this application.

[0025] Figure 3 A circuit structure diagram of another power protection circuit provided for the implementation of the present application.

[0026] Figure 4 Schematic diagram of the electrical equipment structure provided for the implementation of this application.

[0027] Description of reference numerals:

[0028] Electrical equipment-1; power protection circuit-10; start button-11; power supply module-12; LED lamp-13; control module-14; switch module-101; protection module-111; adjustment module-112; first capacitor-C1; switch device-Q1; first resistor-R1; second resistor-R2; first diode-D1; third resistor-R3; fourth resistor-R4; second capacitor-C2; fifth resistor-R5; second diode-D2. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the examples described are 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.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] It should be noted that the power protection circuit and power-consuming equipment provided by the present application can be applied to the battery BMS of low-voltage electric tools, the low-voltage battery BMS for energy storage, and the high-voltage battery BMS for energy storage. In the energy storage industry and the electric bicycle industry, LEDs are often used to display the SOC power of the battery and to turn on / off the machine with a light touch button to ensure that the battery is completely powered off when not in use to reduce self-consumption, and can be turned on at any time to charge / discharge and display the power when in use. For example: high-voltage energy storage batteries are stacked in clusters of 48V, and the high-voltage box at the top has an on / off button. The low-voltage 48V is a single battery box, which also has an on / off button. However, the current LED display and button power on / off functions mostly use the MCU's IO port to output a high / low level to control the LED on and off, and use the IO's upper / lower edge trigger as the power on / off signal. When the start button fails to jump (equivalent to a short circuit in the start button), the power supply / energy storage unit / battery is constantly discharging. When the power of the power supply / energy storage unit / battery is exhausted, the service life of the electrical equipment and the service life of the power supply / energy storage unit / battery are affected. In order to provide users with a better experience and prolong the service life of the electrical equipment or the power supply / energy storage unit / battery, the present application provides a power protection circuit and electrical equipment. A power protection circuit is set between the start button and the power supply module, so that when the start button is short-circuited, the protection module in the power protection circuit controls the switch module to disconnect the power supply module, so that the power supply module stops supplying power to the electrical equipment, thereby preventing the power supply module from being in a discharging state due to a short circuit or failure of the start button to jump, slowing down the use loss of the power supply module, and further extending the service life of the electrical equipment.

[0034] like Figure 1 As shown, a power protection circuit provided in the present application can be arranged in an electrical device 1, and the circuit can also be a separate independent unit / module. The input end of the power protection circuit 10 is connected to one end of the start button 11, and the other end of the start button 11 is grounded (not shown in the figure). The output end of the power protection circuit 10 is connected to the power supply module 12. The power supply module 12 can provide at least one power supply voltage, such as 3.3V or 5V. The specific design can be based on actual needs. In addition, the power supply module 12 can also include a circuit / module composed of a linear voltage regulator unit, a linear voltage regulator and an energy storage element, such as a single or multiple battery packs. In the present application, the power supply module 12 uses a linear voltage regulator to ensure that a stable working voltage is provided to the electrical device.

[0035] In order to improve the service life of electrical equipment, the power protection circuit 10 provided in the embodiment of the present application includes: a switch module 101 and a protection module 111, wherein the switch module 101 is connected to the power supply module 12, and the switch module 101 is used to connect or disconnect the power supply module 12; the protection module 111 is connected to the switch module 101 and the start button 11, and the protection module 111 is used to control the switch module 101 to disconnect the power supply module 12 when the start button 11 is short-circuited, so that the power supply module 12 stops supplying power.

[0036] The power protection circuit 10 provided in the present application is configured to be between a start button 11 and a power supply module 12 so that when the start button 11 is short-circuited, the protection module 111 in the power protection circuit 10 controls the switch module 101 to disconnect the power supply module 12, thereby stopping the power supply module 12 from supplying power. This prevents the energy storage element from being in a discharging state due to a short circuit or failure of the start button 11, thereby reducing the use loss of the energy storage element and further extending the service life of the electrical equipment.

[0037] like Figure 2 As shown, the power protection circuit provided in the present application also includes a switch module 101 and a protection module 111 in the power protection circuit 10. Furthermore, in this embodiment, the protection module 111 is a first capacitor C1, wherein the first end of the first capacitor C1 is connected to the start button 11, and the second end of the first capacitor C1 is connected to the switch module 101.

[0038] Optionally, the first capacitor C1 can be a DC blocking capacitor. As a key component for isolating excessive AC and DC, the DC blocking capacitor simulates the on / off function of the start button 11 according to the capacitor characteristics, and uses the circuit isolation, signal transmission, and charge and discharge characteristics of the capacitor to avoid problems caused by button failure and short circuit. Since the first capacitor C1 is automatically charged and discharged each time the machine is turned on and off, the normal operation of the circuit can be guaranteed even if the start button 11 is used frequently, thereby avoiding continuous discharge of the power supply or battery after the start button 11 is short-circuited, thereby preventing excessive loss of the power supply module.

[0039] In this embodiment, since the start button 11 is connected to a 3.3v power supply, when the start button 11 is short-circuited, the 3.3v power supply will continue to discharge until the energy storage device in the power supply module 12, such as a battery, is completely discharged, which will affect the service life of the electrical equipment in the long run. In order to better prolong the service life of the electrical equipment and improve the user experience, the embodiment of the present application sets a power protection circuit 10 between the start button 11 and the power supply module 12. Through the first capacitor C1 set in the protection module 111 in the power protection circuit 10, the circuit isolation and signal transmission capabilities of the first capacitor C1 are utilized to prevent or avoid that when the start button 11 is short-circuited, the power supply module 12 will not continue to discharge, but utilize the DC isolation capacitor (i.e., the first capacitor C1) and the ability of instantaneous power-on to achieve signal transmission and thereby activate the single-chip computer and the system.

[0040] The switch module 101 is a switch device Q1 , a first terminal of the switch device Q1 is connected to the protection module 111 , a second terminal of the switch device Q1 is connected to a power source, and a third terminal of the switch device Q1 is connected to the power supply module 12 .

[0041] Optionally, the switching device Q1 is a PNP type transistor, wherein the first end of the switching device Q1 is the base connected to the protection module 111, the second end of the switching device Q1 is the emitter connected to the power supply, and the third end of the switching device Q1 is the collector connected to the power supply module 12. In this embodiment, the working characteristics of the PNP type transistor are used to control the voltage at the first end of the switching device Q1 to achieve on-off control of the power supply module 12.

[0042] Optionally, the switch module 101 also includes: a first resistor R1, a second resistor R2 and a first diode D1; the first end of the first resistor R1 is connected to the power supply, and the second end of the first resistor R1 is respectively connected to the first end of the switch device Q1 and the protection module 111; the first end of the second resistor R2 is connected to the third end of the switch device Q1, the second end of the second resistor R2 is connected to the first end of the first diode D1, and the second end of the first diode D1 is connected to VCC output by the power supply module 12. In this embodiment, the first resistor R1, the second resistor R2 and the first diode D1 are set to ensure the stable operation of the switch device Q1 and prevent signal fluctuations in the circuit from affecting the switching state of the switch module 101.

[0043] In the present embodiment, the first capacitor C1 is used as a DC blocking capacitor. Under normal circumstances, when the start button 11 is pressed (non-short-circuit condition), the power supply charges the first capacitor C1, the switch device Q1 is turned on at the same time, and the power supply module 12 is turned on normally; when the start button 11 is abnormally short-circuited, the potential of the first resistor R1 is always pulled down, and the first capacitor C1 is fully charged at this time, and the voltage drop is long-term stable at the power supply voltage, for example, 3.3V, and there is no voltage difference between the emitter and the base of the switch device Q1. When the switch device Q1 is in the cut-off state, the switch device Q1 cannot be turned on. At this time, although the circuit works, when the charging / discharging work of the first capacitor C1 is completed, the power supply module 12 will automatically shut down and enter power saving after a few minutes (the time can be set) in the idle state. In this way, even if the button fails and short-circuits, the power supply module 12 cannot be turned on again, but it avoids the battery pack in the power supply module 12 from being damaged due to the discharge of electricity. In addition, the start button 11 works normally, that is, after each startup, the button pops up, the power supply voltage is output normally, and the first capacitor C1 automatically performs charging and discharging actions, which will not affect the normal startup next time.

[0044] like Figure 3 As shown, the power protection circuit 10 provided in the present application also includes an adjustment module 112, which is connected to the protection module 111 and the start button 11, and the adjustment module 112 is used to adjust the response time of the protection module 111 controlling the switch module 101 to connect or disconnect the power supply module 12.

[0045] Specifically, the adjustment module 112 includes: a third resistor R3, a fourth resistor R4 and a second capacitor C2, the first end of the third resistor R3 and the first end of the fourth resistor R4 are respectively connected to the protection module 111 and the start button 11, the second end of the third resistor R3 is connected to the power supply, the second end of the fourth resistor R4 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is grounded.

[0046] In this embodiment, in order to make the start button 11 respond faster, the charging and discharging speed of the first capacitor can be changed by adjusting the resistance values ​​of the third resistor R3 and the fourth resistor R4 to meet the needs of different customers.

[0047] Optionally, in order to improve the response speed of the first capacitor C1, the resistance of the third resistor R3 can be increased, wherein the charging speed of the first capacitor C1 can be determined according to τ=RC, for example: when the capacitance of the first capacitor C1 is 1uF, the resistance of the third resistor R3 is 39KΩ, then the response speed of the first capacitor C1 is 1uF*39k=39ms. In this embodiment, by adjusting the response speed of the charging and discharging of the first capacitor C1, the user experience can be improved, and the user will not feel that the circuit starts too slowly.

[0048] Optionally, in the power protection circuit 10 provided by the present application, the start button 11 is further connected to a fifth resistor R5 and a second diode D2, wherein a first end of the fifth resistor R5 is connected to the start button 11, a second end of the fifth resistor R5 is connected to a first end of the second diode D2, and a second end of the second diode D2 is grounded. In this embodiment, in order to ensure the stability of the circuit, the fifth resistor R5 and the second diode D2 are connected in series between the start button 11 and the ground to prevent the reverse signal from affecting the circuit.

[0049] like Figure 4 As shown, it is a schematic diagram of the structure of the electric device provided by the present application. In addition to the power protection circuit 10 provided above, the electric device 1 also includes: a control module 14, a power supply module 12, a start button 11 and at least two LED lights 13, wherein the start button 11 is connected to the protection module 111 in the power protection circuit 10, the protection module 111 is connected to the switch module 101, the switch module 101 is connected to the power supply module 12, the power supply module 12 is connected to the control module 14, and the control module 14 is respectively connected to the protection module 111 and the at least two LED lights 13, wherein the control module 14 is used to control the on and off of at least two LED lights 13 to indicate the power consumption of the electric device when the start button 11 is turned on and the electric device is in normal power supply.

[0050] The power protection circuit 10 provided in the embodiment of the present application is configured to provide the power protection circuit 10 between the start button 11 and the power supply module 12, so that when the start button 11 is short-circuited, the protection module 111 in the power protection circuit 10 controls the switch module 101 to disconnect the power supply module 12, so that the power supply module 12 stops supplying power, thereby preventing the power supply module from being in a discharging state due to the short circuit or failure of the start button 11, reducing the use loss of the power supply module, and further extending the service life of the electrical equipment.

[0051] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A power protection circuit, characterized in that: The power protection circuit is connected in series between the start button and the power supply module, and the power protection circuit includes: A switch module, connected to the power supply module, and used to switch on or off the power supply module; The protection module is connected to the switch module and the start button, and is used to control the switch module to disconnect the power supply module when the start button is short-circuited, so that the power supply module stops supplying power.

2. The power protection circuit according to claim 1, characterized in that: The protection module includes: a first capacitor, a first end of the first capacitor is connected to the start button, and a second end of the first capacitor is connected to the switch module.

3. The power protection circuit according to claim 1, characterized in that: The switch module comprises: a switch device, a first end of the switch device is connected to the protection module, a second end of the switch device is connected to a power source, and a third end of the switch device is connected to the power supply module.

4. The power protection circuit according to claim 3, characterized in that: The switch device is a PNP type transistor.

5. The power protection circuit according to claim 3, characterized in that: The switch module also includes: a first resistor, a second resistor and a first diode; the first end of the first resistor is connected to the power supply, and the second end of the first resistor is respectively connected to the first end of the switch device and the protection module; the first end of the second resistor is connected to the third end of the switch device, the second end of the second resistor is connected to the first end of the first diode, and the second end of the first diode is connected to the power supply module.

6. The power protection circuit according to claim 1, characterized in that: Also includes: The adjustment module is connected to the protection module and the start button, and is used to adjust the response time of the protection module controlling the switch module to connect or disconnect the power supply module.

7. The power protection circuit according to claim 6, characterized in that: The adjustment module includes: a third resistor, a fourth resistor and a second capacitor, the first end of the third resistor and the first end of the fourth resistor are respectively connected to the protection module and the start button, the second end of the third resistor is connected to a power supply, the second end of the fourth resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

8. The power protection circuit according to claim 1, characterized in that: include: A fifth resistor and a second diode, wherein a first end of the fifth resistor is connected to the start button, a second end of the fifth resistor is connected to a first end of the second diode, and a second end of the second diode is grounded.

9. An electrical device, characterized in that: The invention comprises a power protection circuit as described in any one of claims 1 to 8.

10. The electrical equipment according to claim 9, characterized in that: Also includes: Power supply module, start button and at least two LED lights; The control module is respectively connected to the at least two LED lights, the power protection circuit, and the power supply module. The power protection circuit is connected to the start button. The control module is used to control the on and off of the at least two LED lights to indicate the power consumption of the electrical equipment when the start button is turned on and the electrical equipment is in normal power supply.

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