Discharge protection circuit and power adapter

Abstract

This utility model discloses a discharge protection circuit and a power adapter. The discharge protection circuit includes a voltage output circuit that outputs a first voltage; a first switching circuit for turning on or off the voltage output circuit and the load output circuit; a current detection circuit for detecting a first current; a voltage detection circuit connected to the load output circuit and ground for detecting the load voltage; a main control circuit connected to the first switching circuit, the current detection circuit, the voltage detection circuit, and the LED indicator circuit for controlling the operation of the first switching circuit according to the first current and the load voltage, and outputting a fault indication signal to the LED indicator circuit; the LED indicator circuit for displaying different fault states according to the fault indication signal, thereby promptly controlling the first switching circuit to disconnect and indicating the corresponding fault state when the current or voltage is abnormal, so as to facilitate users to quickly diagnose fault problems and improve fault diagnosis efficiency.

Description

Technical Field

[0001] This utility model relates to the field of discharge control technology, and in particular to a discharge protection circuit and a power adapter. Background Technology

[0002] With the widespread use of electronic devices, circuit protection technology (especially discharge protection) is becoming increasingly important in power management, battery systems, industrial equipment, and other fields. The core function of discharge protection circuits is to prevent loads from being damaged due to abnormal conditions such as overvoltage, overcurrent, or short circuits, while ensuring the safe and reliable operation of the system.

[0003] Traditional discharge protection circuits typically use simple fuses, relays, or MOSFET switches to achieve overcurrent protection. However, they only provide the disconnection function and lack the ability to distinguish between different types of faults, making it difficult for users to quickly diagnose problems. Utility Model Content

[0004] This utility model provides a discharge protection circuit and a power adapter to solve the problem that existing discharge protection circuits cannot achieve rapid fault diagnosis.

[0005] A discharge protection circuit includes a main control circuit, a voltage output circuit, a current detection circuit, a voltage detection circuit, a first switch circuit, an LED indicator circuit, and a load output circuit. The voltage output circuit is used to output a first voltage; The first switching circuit is connected to the voltage output circuit and the load output circuit, and is used to turn the voltage output circuit and the load output circuit on or off; The current detection circuit is disposed between the voltage output circuit and the first switching circuit, and is used to detect the first current. The voltage detection circuit is connected to the load output circuit and ground, and is used to detect the load voltage. The main control circuit is connected to the first switching circuit, the current detection circuit, the voltage detection circuit and the LED indicator circuit, and is used to control the first switching circuit to work according to the first current and the load voltage, and output a fault indication signal to the LED indicator circuit. The LED indicator circuit is used to display different fault states according to the fault indication signal.

[0006] Furthermore, the main control circuit is also used to receive the first power supply voltage, and is connected to the voltage output circuit to output a first control signal to the voltage output circuit; The voltage output circuit is used to connect to the power input terminal and output the first voltage according to the power supply voltage input to the power input terminal and the first control signal output by the main control circuit.

[0007] Furthermore, the discharge protection circuit also includes a power supply circuit; The power supply circuit is used to connect the power input terminal and the main control circuit, and is used to output the first power supply voltage to the main control circuit according to the power supply voltage input at the power input terminal.

[0008] Furthermore, the voltage output circuit includes a first switching transistor, a second switching transistor, a first inductor circuit, and a first capacitor circuit; The first end of the first switching transistor is connected to the power input terminal, the second end of the first switching transistor is connected to the first end of the second switching transistor, and the second end of the second switching transistor is connected to the first ground terminal. The first control terminal of the main control circuit is connected to the third terminal of the first switching transistor, the second control terminal of the main control circuit is connected to the third terminal of the second switching transistor, and the third control terminal of the main control circuit is connected to the connection node between the first switching transistor and the second switching transistor. The first terminal of the first inductor circuit is connected to the third control terminal of the main control circuit, the second terminal of the first switching transistor, and the first terminal of the second switching transistor. The second terminal of the first inductor circuit is connected to the first terminal of the first capacitor circuit and the current detection circuit. The second terminal of the first capacitor circuit is connected to the first ground terminal.

[0009] Furthermore, the current detection circuit includes a first detection resistor and a second detection resistor; The first end of the first detection resistor is connected to the first end of the first capacitor circuit and the second end of the first inductor circuit, and the second end of the first detection resistor is connected to the first switch circuit. The first end of the second detection resistor is connected to the second end of the first capacitor circuit, and the second end of the second detection resistor is connected to the second ground terminal. The first current detection terminal of the main control circuit is connected to the first terminal and the second terminal of the first detection resistor, and / or the second current detection terminal of the main control circuit is connected to the first terminal and the second terminal of the second detection resistor, for detecting the first current.

[0010] Furthermore, the voltage detection circuit includes a second capacitor; The first terminal of the second capacitor is connected to the first switching circuit and the load output circuit, and the second terminal of the second capacitor is connected to the second ground terminal. The first voltage detection terminal of the main control circuit is connected to the first terminal and the second terminal of the second capacitor, and is used to detect the load voltage.

[0011] Furthermore, the LED indicator circuit includes at least one LED component and a driving circuit; each LED component includes a first LED, a second LED, and a third LED. The first LED of each LED assembly is connected to the main control circuit through a driving circuit to indicate the normal operating status. The second LED of each LED assembly is connected to the main control circuit through a driving circuit to indicate an abnormal current state. The third LED of each LED assembly is connected to the main control circuit via a driving circuit to indicate an abnormal voltage state.

[0012] Furthermore, the driving circuit includes a first voltage divider circuit and a third switching transistor; The first end of the third switch is used to connect to the first LED, or the second LED, or the third LED, and the second end of the third switch is connected to the first ground terminal. The first terminal of the first voltage divider circuit is connected to the main control circuit, the second terminal of the first voltage divider circuit is connected to the first ground terminal, and the third terminal of the first voltage divider circuit is connected to the third terminal of the third switching transistor.

[0013] Furthermore, the load output circuit includes a USB interface.

[0014] A power adapter including the above-described discharge protection circuit.

[0015] The aforementioned discharge protection circuit and power adapter include a main control circuit, a voltage output circuit, a current detection circuit, a voltage detection circuit, a first switch circuit, an LED indicator circuit, and a load output circuit. The voltage output circuit outputs a first voltage. The first switch circuit is connected to the voltage output circuit and the load output circuit, used to turn the voltage output circuit and the load output circuit on or off. The current detection circuit is located between the voltage output circuit and the first switch circuit, used to detect a first current. The voltage detection circuit is connected to the load output circuit and ground, used to detect the load voltage. The main control circuit is connected to the first switch circuit, the current detection circuit, the voltage detection circuit, and the LED indicator circuit, used to control the operation of the first switch circuit based on the first current and the load voltage, and output a fault indication signal to the LED indicator circuit. The LED indicator circuit displays different fault states based on the fault indication signal, thereby promptly controlling the first switch circuit to disconnect and indicating the corresponding fault state when the current or voltage is abnormal, facilitating quick fault diagnosis by the user and improving fault diagnosis efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a circuit diagram of a discharge protection circuit in one embodiment of the present invention.

[0018] In the diagram: 11. Main control circuit; 12. Voltage output circuit; 13. Current detection circuit; 14. Voltage detection circuit; 15. First switch circuit; 16. LED indicator circuit; 161. At least one LED component; 162. Driver circuit; 17. Load output circuit; 18. Power supply circuit. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0021] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this utility model, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0022] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0023] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0024] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0025] This embodiment provides a discharge protection circuit, such as Figure 1 As shown, the circuit includes a main control circuit 11, a voltage output circuit 12, a current detection circuit 13, a voltage detection circuit 14, a first switch circuit 15, an LED indicator circuit 16, and a load output circuit 17. The voltage output circuit 12 outputs a first voltage. The first switch circuit 15 is connected to the voltage output circuit 12 and the load output circuit 17, and is used to turn the voltage output circuit 12 and the load output circuit 17 on or off. The current detection circuit 13 is located between the voltage output circuit 12 and the first switch circuit 15, and is used to detect a first current. The voltage detection circuit 14 is connected to the load output circuit 17 and ground, and is used to detect the load voltage. The main control circuit 11 is connected to the first switch circuit 15, the current detection circuit 13, the voltage detection circuit 14, and the LED indicator circuit 16, and is used to control the first switch circuit 15 to operate according to the first current and the load voltage, and to output a fault indication signal to the LED indicator circuit 16. The LED indicator circuit 16 displays different fault states according to the fault indication signal.

[0026] As an example, voltage output circuit 12 is used to output a first voltage to provide a first voltage to load output circuit 17. Load output circuit 17 is used to connect an electrical load.

[0027] As an example, the first switching circuit 15 is connected to the voltage output circuit 12 and the load output circuit 17, and is used to turn the voltage output circuit 12 and the load output circuit 17 on or off, so as to disconnect the voltage output circuit 12 and the load output circuit 17 in the event of abnormal current or voltage, thereby improving the safety of the discharge protection circuit. As an example, the first switching circuit 15 includes a fourth switching transistor Q3, which is a MOSFET or an IGBT. The drain of the fourth switching transistor Q3 is connected to the current sensing current 13, the source of the fourth switching transistor Q3 is connected to the load output circuit 17, and the gate (GATE2) of the fourth switching transistor Q3 is connected to the main control circuit 11 (GATE1).

[0028] As an example, the current detection circuit 13 is positioned between the voltage output circuit 12 and the first switching circuit 15 to detect a first current. In this example, the first current is the load current when the discharge protection circuit discharges. By detecting the first current, it is determined whether an abnormal current has occurred, such as an excessively high load current.

[0029] As an example, the voltage detection circuit 14 is connected to the load output circuit 17 and ground to detect the load voltage. In this example, the load voltage is the voltage of the load output circuit 17. The load voltage is used to determine whether an abnormal current has occurred, such as excessive load voltage. Furthermore, the load output circuit 17 includes a USB interface.

[0030] As an example, the main control circuit 11 is connected to the first switching circuit 15, the current detection circuit 13, the voltage detection circuit 14, and the LED indicator circuit 16. It controls the first switching circuit 15 to operate based on the first current and the load voltage, and outputs a fault indication signal to the LED indicator circuit 16. Exemplarily, when the main control circuit 11 determines that an abnormal current and / or an abnormal voltage has occurred based on the first current and the load voltage (e.g., the first current is greater than the safe current, and the load voltage is greater than the safe voltage), it controls the first switching circuit 15 to open and sends a fault indication signal to the LED indicator circuit 16, so that the LED indicator circuit 16 can display different fault states.

[0031] As an example, the LED indicator circuit 16 is used to display different fault states based on the fault indication signal. Exemplarily, when the discharge protection circuit is operating normally, the LED indicator circuit 16 displays a green light. When the first current exceeds the safe current, i.e., the current is abnormal, the LED indicator circuit 16 displays a yellow light. When the load voltage exceeds the safe voltage, i.e., the voltage is abnormal, or when both the first current and the load voltage exceed the safe current, and when both current and voltage are abnormal, the LED indicator circuit 16 displays a red light.

[0032] In this embodiment, the discharge protection circuit includes a main control circuit 11, a voltage output circuit 12, a current detection circuit 13, a voltage detection circuit 14, a first switch circuit 15, an LED indicator circuit 16, and a load output circuit 17. The voltage output circuit 12 is used to output a first voltage. The first switch circuit 15 is connected to the voltage output circuit 12 and the load output circuit 17, and is used to turn the voltage output circuit 12 and the load output circuit 17 on or off. The current detection circuit 13 is located between the voltage output circuit 12 and the first switch circuit 15, and is used to detect a first current. The voltage detection circuit 14 is connected to the load output circuit 17. The output circuit 17 is connected to ground and is used to detect the load voltage. The main control circuit 11 is connected to the first switching circuit 15, the current detection circuit 13, the voltage detection circuit 14, and the LED indicator circuit 16. It is used to control the first switching circuit 15 to work according to the first current and the load voltage, and output a fault indication signal to the LED indicator circuit 16. The LED indicator circuit 16 is used to display different fault states according to the fault indication signal, so that when the current or voltage is abnormal, it can control the first switching circuit 15 to disconnect in time and indicate the corresponding fault state, so as to facilitate users to quickly diagnose fault problems and improve fault diagnosis efficiency.

[0033] In one embodiment, the main control circuit 11 is also used to receive a first power supply voltage and is connected to the voltage output circuit 12, and is used to output a first control signal to the voltage output circuit 12; the voltage output circuit 12 is used to connect to the power input terminal VIN, and output a first voltage according to the power supply voltage input at the power input terminal VIN and the first control signal output by the main control circuit 11.

[0034] In this embodiment, the main control circuit 11 is powered by a first supply voltage to ensure its normal operation. The main control circuit 11 outputs a first control signal to the voltage output circuit 12 to control the voltage output circuit 12 to output a stable and accurate first voltage.

[0035] In one embodiment, the discharge protection circuit further includes a power supply circuit 18; the power supply circuit 18 is used to connect to the power input terminal VIN and is connected to the main control circuit 11, and is used to output a first power supply voltage to the main control circuit 11 according to the power supply voltage input at the power input terminal VIN.

[0036] For example, the power supply circuit 18 includes a low-dropout linear regulator. The power supply circuit 18 is connected to the power input terminal VIN and the main control circuit 11, and outputs a first supply voltage to the main control circuit 11 based on the power supply voltage input at the power input terminal VIN. Optionally, the power input terminal VIN can be a mains connection terminal, and the power supply voltage can be the mains voltage. In this example, the power supply circuit 18 is connected to the main control circuit 11 via the power input terminal VIN, and outputs a first supply voltage to the main control circuit 11 based on the power supply voltage input at the power input terminal VIN to ensure the operational stability of the main control circuit 11.

[0037] In one embodiment, the voltage output circuit 12 includes a first switch Q1, a second switch Q2, a first inductor L1 circuit, and a first capacitor circuit. The first terminal of the first switch Q1 is connected to the power input terminal VIN, the second terminal of the first switch Q1 is connected to the first terminal of the second switch Q2, and the second terminal of the second switch Q2 is connected to the first ground terminal. The first control terminal of the main control circuit 11 is connected to the third terminal of the first switch Q1, the second control terminal of the main control circuit 11 is connected to the third terminal of the second switch Q2, and the third control terminal of the main control circuit 11 is connected to the connection node between the first switch Q1 and the second switch Q2. The first terminal of the first inductor L1 circuit is connected to the third control terminal of the main control circuit 11, the second terminal of the first switch Q1, and the first terminal of the second switch Q2. The second terminal of the first inductor L1 circuit is connected to the first terminal of the first capacitor circuit and the current detection circuit 13. The second terminal of the first capacitor circuit is connected to the first ground terminal.

[0038] In this example, the first switch Q1 and the second switch Q2 can be MOSFETs or IGBTs. Specifically, the first switch Q1 is a MOSFET, the second switch Q1 is a source, and the third switch Q1 is a gate. Similarly, the second switch Q2 is a drain, the second switch Q2 is a source, and the third switch Q2 is a gate.

[0039] The circuit includes a first inductor L1 and a first capacitor. Optionally, the number of first capacitors can be set according to actual needs and is not limited here. For example, the first capacitors include capacitors C58, C59, and C60. Capacitors C58, C59, and C60 are connected in parallel.

[0040] For example, the main control circuit 11 includes a power management chip U1. The first control terminal HG of the main control circuit 11 is connected to the third terminal of the first switching transistor Q1, the second control terminal LG of the main control circuit 11 is connected to the third terminal of the second switching transistor Q2, and the third control terminal SW of the main control circuit 11 is connected to the connection node between the first switching transistor Q1 and the second switching transistor Q2. In this example, when the first switching transistor Q1 is on and the second switching transistor Q2 is off, the power supply voltage charges the first inductor L1 circuit through the first switching transistor Q1, simultaneously supplying power to the load output circuit 17, and the first inductor L1 circuit stores energy. When the first switching transistor Q1 is off and the second switching transistor Q2 is on, the first inductor L1 circuit, due to its characteristic of impeding current changes, forms a loop through the second switching transistor Q2, releasing the stored energy and continuing to supply power to the load output circuit 17, preventing a sudden drop in output voltage. The alternating conduction of the first switching transistor Q1 and the second switching transistor Q2, combined with the energy storage characteristics of the first inductor L1 circuit, achieves continuous energy transfer, ensuring stable output voltage.

[0041] In one embodiment, the current detection circuit 13 includes a first detection resistor RS2 and a second detection resistor RS1; the first end of the first detection resistor RS2 is connected to the first end of the first capacitor circuit and the second end of the first inductor L1 circuit, and the second end of the first detection resistor RS2 is connected to the first switch circuit 15; the first end of the second detection resistor RS1 is connected to the second end of the first capacitor circuit, and the second end of the second detection resistor RS1 is connected to the second ground terminal; the first current detection terminal of the main control circuit 11 is connected to the first end of the first detection resistor RS2 and the second end of the first detection resistor RS2, and / or the second current detection terminal of the main control circuit 11 is connected to the first end of the second detection resistor RS1 and the second end of the second detection resistor RS1, for detecting the first current.

[0042] For example, the first current detection segment includes CSP2 and CSN2 terminals, and the second current detection segment includes CSP1 and CSN1 terminals.

[0043] In this embodiment, the main control circuit 11 detects the voltage of the first detection resistor RS2 and / or the second detection resistor RS1. When the first detection resistor RS2 and / or the second detection resistor RS1 are short-circuited or damaged, the first current abnormality detection is achieved, thereby improving the detection accuracy. The circuit structure is simple and the cost is low.

[0044] In one embodiment, the voltage detection circuit 14 includes a second capacitor C89; the first end of the second capacitor C89 is connected to the first switching circuit 15 and the load output circuit 17, and the second end of the second capacitor C89 is connected to the second ground terminal; the first voltage detection terminal of the main control circuit 11 is connected to the first end of the second capacitor C89 and the second end of the second capacitor C89, and is used to detect the load voltage.

[0045] For example, the first voltage detection terminal includes a VSN1 terminal and a VSP1 terminal. In this embodiment, the first terminal of the second capacitor C89 is connected to the first switching circuit 15 and the load output circuit 17, and the second terminal of the second capacitor C89 is connected to the second ground terminal; the first voltage detection terminal of the main control circuit 11 is connected to the first terminal of the second capacitor C89 and the second terminal of the second capacitor C89, for detecting the load voltage to prevent the voltage of the load output circuit 17 from being too high, causing damage to the discharge protection circuit and improving the safety of the discharge protection circuit.

[0046] In one embodiment, the LED indicator circuit 16 includes at least one LED component 161 and a driving circuit 162; each LED component includes a first LED, a second LED, and a third LED; the first LED of each LED component is connected to the main control circuit 11 through the driving circuit 162 to indicate a normal operating state; the second LED of each LED component is connected to the main control circuit 11 through the driving circuit 162 to indicate an abnormal current state; and the third LED of each LED component is connected to the main control circuit 11 through the driving circuit 162 to indicate an abnormal voltage state.

[0047] For example, the first LED, the second LED, and the third LED are LEDs of different colors. The first LED is green, the second LED is yellow, and the third LED is red.

[0048] For example, at least one LED component 161 includes LED1, LED2, LED3, and LED4, each of which includes a first LED, a second LED, and a third LED. The first LEDs in each LED component are connected in parallel. The second LEDs in each LED component are connected in parallel. The third LEDs in each LED component are connected in parallel.

[0049] In this embodiment, the first control signal includes a first LED control signal, a second LED control signal, and a third LED control signal. During normal operation, the main control circuit 11 outputs the first LED control signal to control the first LED of each LED assembly to operate, indicating that the discharge protection circuit is working normally. When the current is abnormal, the main control circuit 11 outputs the second LED control signal to control the second LED of each LED assembly to operate, indicating that the discharge protection circuit is in an abnormal current state. When the voltage is abnormal, the main control circuit 11 outputs the third LED control signal to control the third LED of each LED assembly to operate, indicating that the discharge protection circuit is in a abnormal voltage state.

[0050] In one embodiment, the driving circuit 162 includes a first voltage divider circuit and a third switching transistor; the first end of the third switching transistor is used to connect to a first LED, or a second LED, or a third LED, and the second end of the third switching transistor is connected to a first ground terminal; the first end of the first voltage divider circuit is connected to the main control circuit 11, the second end of the first voltage divider circuit is connected to the first ground terminal, and the third end of the first voltage divider circuit is connected to the third end of the third switching transistor.

[0051] As an example, the first voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor. The first terminal of the first voltage divider resistor is connected to the main control circuit 11, the second terminal of the first voltage divider resistor is connected to the first terminal of the second voltage divider resistor, and the second terminal of the second voltage divider resistor is connected to the first ground terminal. Exemplarily, the first voltage divider resistor includes resistor R49, resistor R52, or resistor R60. The second voltage divider resistor includes resistor R48, resistor R53, or resistor R58.

[0052] As an example, the third switching transistor includes switching transistors Q4, Q5, and Q6. The first end of switching transistor Q4 is used to connect to the first LED; the first end of switching transistor Q5 is used to connect to the second LED; and the first end of switching transistor Q6 is used to connect to the third LED.

[0053] In this embodiment, the first terminal of the first switching transistor Q1 is used to connect to the first LED, or the second LED, or the third LED, and the second terminal of the first switching transistor Q1 is connected to the first ground terminal; the first terminal of the first voltage divider circuit is connected to the main control circuit 11, the second terminal of the first voltage divider circuit is connected to the first ground terminal, and the third terminal of the first voltage divider circuit is connected to the third terminal of the first switching transistor Q1, so as to ensure the stability and reliability of the operation of the first LED, or the second LED, or the third LED.

[0054] This embodiment provides a power adapter, including the discharge protection circuit described above.

[0055] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A discharge protection circuit, characterized by comprising: It includes a main control circuit, a voltage output circuit, a current detection circuit, a voltage detection circuit, a first switch circuit, an LED indicator circuit, and a load output circuit; The voltage output circuit is used to output a first voltage; The first switching circuit is connected to the voltage output circuit and the load output circuit, and is used to turn the voltage output circuit and the load output circuit on or off; The current detection circuit is disposed between the voltage output circuit and the first switching circuit, and is used to detect the first current. The voltage detection circuit is connected to the load output circuit and ground, and is used to detect the load voltage. The main control circuit is connected to the first switching circuit, the current detection circuit, the voltage detection circuit and the LED indicator circuit, and is used to control the first switching circuit to work according to the first current and the load voltage, and output a fault indication signal to the LED indicator circuit. The LED indicator circuit is used to display different fault states according to the fault indication signal.

2. The discharge protection circuit of claim 1, wherein, The main control circuit is also used to receive the first power supply voltage and is connected to the voltage output circuit to output the first control signal to the voltage output circuit. The voltage output circuit is used to connect to the power input terminal and output the first voltage according to the power supply voltage input to the power input terminal and the first control signal output by the main control circuit.

3. The discharge protection circuit of claim 2, wherein, The discharge protection circuit also includes a power supply circuit; The power supply circuit is used to connect the power input terminal and the main control circuit, and is used to output the first power supply voltage to the main control circuit according to the power supply voltage input at the power input terminal.

4. The discharge protection circuit of claim 2, wherein, The voltage output circuit includes a first switching transistor, a second switching transistor, a first inductor circuit, and a first capacitor circuit; The first end of the first switching transistor is connected to the power input terminal, the second end of the first switching transistor is connected to the first end of the second switching transistor, and the second end of the second switching transistor is connected to the first ground terminal. The first control terminal of the main control circuit is connected to the third terminal of the first switching transistor, the second control terminal of the main control circuit is connected to the third terminal of the second switching transistor, and the third control terminal of the main control circuit is connected to the connection node between the first switching transistor and the second switching transistor. The first terminal of the first inductor circuit is connected to the third control terminal of the main control circuit, the second terminal of the first switching transistor, and the first terminal of the second switching transistor. The second terminal of the first inductor circuit is connected to the first terminal of the first capacitor circuit and the current detection circuit. The second terminal of the first capacitor circuit is connected to the first ground terminal.

5. The discharge protection circuit as described in claim 4, characterized in that, The current detection circuit includes a first detection resistor and a second detection resistor; The first end of the first detection resistor is connected to the first end of the first capacitor circuit and the second end of the first inductor circuit, and the second end of the first detection resistor is connected to the first switch circuit. The first end of the second detection resistor is connected to the second end of the first capacitor circuit, and the second end of the second detection resistor is connected to the second ground terminal. The first current detection terminal of the main control circuit is connected to the first terminal and the second terminal of the first detection resistor, and / or the second current detection terminal of the main control circuit is connected to the first terminal and the second terminal of the second detection resistor, for detecting the first current.

6. The discharge protection circuit as described in claim 5, characterized in that, The voltage detection circuit includes a second capacitor; The first terminal of the second capacitor is connected to the first switching circuit and the load output circuit, and the second terminal of the second capacitor is connected to the second ground terminal. The first voltage detection terminal of the main control circuit is connected to the first terminal and the second terminal of the second capacitor, and is used to detect the load voltage.

7. The discharge protection circuit as described in claim 1, characterized in that, The LED indicator circuit includes at least one LED component and a driving circuit; each LED component includes a first LED, a second LED, and a third LED. The first LED of each LED assembly is connected to the main control circuit through a driving circuit to indicate the normal operating status. The second LED of each LED assembly is connected to the main control circuit through a driving circuit to indicate an abnormal current state. The third LED of each LED assembly is connected to the main control circuit via a driving circuit to indicate an abnormal voltage state.

8. The discharge protection circuit as described in claim 7, characterized in that, The driving circuit includes a first voltage divider circuit and a third switching transistor; The first end of the third switch is used to connect to the first LED, or the second LED, or the third LED, and the second end of the third switch is connected to the first ground terminal. The first terminal of the first voltage divider circuit is connected to the main control circuit, the second terminal of the first voltage divider circuit is connected to the first ground terminal, and the third terminal of the first voltage divider circuit is connected to the third terminal of the third switching transistor.

9. The discharge protection circuit as described in claim 1, characterized in that, The load output circuit includes a USB interface.

10. A power adapter, characterized in that, Includes the discharge protection circuit as described in any one of claims 1 to 9.

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