A circuit with short circuit protection function and control device thereof

Abstract

The utility model discloses a kind of circuit with short-circuit protection function and its control device, including the monitoring circuit for monitoring circuit input voltage, with the processing device connected with the monitoring circuit, and with the processing device connected cut-off circuit;Wherein, the cut-off circuit includes high-speed executor, the high-speed executor is respectively connected with the processing device, power supply VCC and external controller;The processing device is configured as: under the control of the input voltage to judge whether to cut off its output signal;And by the presence or absence of the output signal, control whether the high-speed executor connects or disconnects power supply VCC and controller;Its beneficial effect is: by real-time monitoring voltage, once detecting abnormal large current, by high-speed executor fastly blocking short-circuit risk, directly cut off from source, to preserve controller, mainboard and other core hardware.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, specifically to a circuit with short-circuit protection function and its control device. Background Technology

[0002] A short circuit can cause voltage instability or even collapse of the entire system, affecting the operation of other normal components. If a short circuit occurs during operation due to device aging or external factors (such as moisture or foreign objects), it will generate huge instantaneous current and high temperature. Without protection, it will first burn out the controller's drive circuit MOS, and may even affect the main processor (CPU / GPU) or motherboard.

[0003] Therefore, there is an urgent need for a solution that can quickly block the risk of short circuits and protect core hardware such as controllers and motherboards. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a circuit and its control device with short-circuit protection function, so as to quickly block short-circuit risks and protect the controller.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In a first aspect, a circuit with short-circuit protection function includes a monitoring circuit for monitoring the circuit input voltage, a processing device connected to the monitoring circuit, and a disconnection circuit connected to the processing device; wherein the disconnection circuit includes a high-speed actuator, which is connected to the processing device, a power supply VCC, and an external controller respectively.

[0007] The processing device is configured to: be controlled by the input voltage to determine whether to cut off its output signal; and control the high-speed actuator to connect or disconnect the power supply VCC from the controller based on the presence or absence of the output signal.

[0008] Preferably, the monitoring circuit adopts a resistor voltage divider circuit, including two resistors connected in series, and the connection point of the two series resistors is connected to the input terminal of the processing device.

[0009] Preferably, the processing device is a voltage comparison chip.

[0010] Preferably, the high-speed actuator is a MOSFET, the gate of the MOSFET is connected to the output terminal of the processing device, the source of the MOSFET is connected to the power supply VCC, and the drain of the MOSFET is connected to an external controller.

[0011] Preferably, a resistor is also connected between the gate and source of the MOS transistor.

[0012] Preferably, the circuit input is further connected to a linear regulator before outputting the power supply VCC.

[0013] In a second aspect, a control device includes a controller and a circuit with short-circuit protection as described in the first aspect.

[0014] Preferably, the controller further includes a PWM pin that outputs a PWM signal, and a corresponding indicator light is connected through the PWM pin.

[0015] The beneficial effects of this utility model are reflected in the following: through the monitoring circuit in the circuit, the processing device connected to the monitoring circuit, and the disconnection circuit connected to the processing device, the voltage is monitored in real time. Once an abnormal large current is detected, the high-speed actuator quickly blocks the risk of short circuit and cuts off the circuit directly from the source, thereby protecting the controller, motherboard and other core hardware. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 A circuit diagram of a circuit with short-circuit protection function provided for an embodiment of this utility model;

[0018] Figure 2 A circuit diagram of a linear voltage regulator provided for an embodiment of this utility model;

[0019] Figure 3 A circuit diagram of a controller provided for an embodiment of this utility model. Detailed Implementation

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0021] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0025] like Figure 1 As shown, this utility model provides a circuit with short-circuit protection function, including a monitoring circuit for monitoring the circuit input voltage, a processing device connected to the monitoring circuit, and a disconnection circuit connected to the processing device; wherein, the disconnection circuit includes a high-speed actuator, which is connected to the processing device, the power supply VCC, and an external controller respectively;

[0026] The processing device is configured to: be controlled by the input voltage to determine whether to cut off its output signal; and control the high-speed actuator to connect or disconnect the power supply VCC from the controller based on the presence or absence of the output signal.

[0027] In this embodiment, the monitoring circuit employs a resistor voltage divider circuit, including two resistors connected in series. The connection point of the two series resistors is connected to the input terminal of the processing device; the two series resistors are... Figure 1 The resistors R130 and R131 are shown in the diagram.

[0028] The processing device uses a voltage comparison chip, namely Figure 1The working principle of U16 in the figure is well known to those skilled in the art and will not be described in detail here. For example, during normal operation, the output signal maintains a stable high level to power the external controller. Only when a short circuit occurs, causing the input voltage to cross the threshold voltage, will the output be cut off, thus cutting off the power supply before driving the MOS.

[0029] In this embodiment, the high-speed actuator is a MOS transistor, i.e. Figure 1 Q32 in the diagram; the gate of the MOSFET is connected to the output terminal of the processing device, the source of the MOSFET is connected to the power supply VCC, and the drain of the MOSFET is connected to an external controller; see subsequent sections. Figure 3 It can be seen that, Figure 1 LDO_IN and Figure 3 The corresponding LDO_IN connection.

[0030] In application, a resistor is also connected between the gate and source of the MOS transistor; for example... Figure 1 The resistor R133 is in the middle.

[0031] Furthermore, referring to Figure 2 The circuit input is also connected to a linear regulator, which outputs the power supply VCC; wherein the linear regulator is an HT7550.

[0032] The above solution uses a monitoring circuit, a processing device connected to the monitoring circuit, and a disconnection circuit connected to the processing device to monitor the voltage in real time. Once an abnormally large current is detected, a high-speed actuator quickly blocks the risk of a short circuit and cuts it off directly from the source, thereby protecting the controller, motherboard, and other core hardware.

[0033] Furthermore, in another embodiment, a control device is also provided, including a controller and a circuit with short-circuit protection function as described above.

[0034] When applied, the controller is in Figure 3 In Chinese, it is represented by Y68 (MCU), see reference. Figure 3 The controller also includes a PWM pin that outputs a PWM signal, and a corresponding indicator light is connected to the PWM pin.

[0035] Reference Figure 3 As shown, the PWM signal includes PWMG, PWMB and PWMR; the indicator light can be an LED indicator light, and different colors can be set to distinguish the fault type.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the 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 or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A circuit with short-circuit protection function, characterized in that... It includes a monitoring circuit for monitoring the input voltage of the circuit, a processing device connected to the monitoring circuit, and a cut-off circuit connected to the processing device; wherein, the cut-off circuit includes a high-speed actuator, which is connected to the processing device, the power supply VCC and an external controller respectively; The processing device is configured to: be controlled by the input voltage to determine whether to cut off its output signal; and control the high-speed actuator to connect or disconnect the power supply VCC from the controller based on the presence or absence of the output signal.

2. The circuit with short-circuit protection function according to claim 1, characterized in that, The monitoring circuit uses a resistor voltage divider circuit, which includes two resistors connected in series. The connection point of the two series resistors is connected to the input terminal of the processing device.

3. A circuit with short-circuit protection function according to claim 1, characterized in that, The processing device uses a voltage comparison chip.

4. A circuit with short-circuit protection function according to claim 2, characterized in that, The high-speed actuator uses a MOSFET. The gate of the MOSFET is connected to the output terminal of the processing device, the source of the MOSFET is connected to the power supply VCC, and the drain of the MOSFET is connected to an external controller.

5. A circuit with short-circuit protection function according to claim 4, characterized in that, A resistor is also connected between the gate and source of the MOS transistor.

6. A circuit with short-circuit protection function according to claim 1, characterized in that, The circuit input is also connected to a linear regulator, and then outputs the power supply VCC.

7. A control device, characterized in that, It includes a controller and a circuit with short-circuit protection as described in any one of claims 1-6.

8. A control device according to claim 7, characterized in that, The controller also includes a PWM pin that outputs a PWM signal, and a corresponding indicator light is connected to the PWM pin.

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