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Surge protection circuit, surge protection method and battery power supply circuit
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A surge protection and circuit technology, applied in the circuit field, can solve the problem of high circuit cost
Inactive Publication Date: 2021-05-14
GUANGZHOU XAIRCRAFT TECH CO LTD
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Abstract
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[0004] Embodiments of the present invention provide a surge protection circuit, a surge protection method, and a battery power supply circuit to at least solve the problems caused by increasing the withstand voltage value of the device or adding a surge absorbing module to prevent the device from being damaged by the surge high voltage in the prior art. Technical issues with higher circuit costs
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Embodiment 1
[0027] According to an embodiment of the present invention, an embodiment of a surge protection circuit is provided, figure 1 is a schematic diagram of a surge protection circuit according to an embodiment of the present invention, such as figure 1 As shown, the surge protection circuit includes:
[0028] The surge detection circuit 11 is used to detect whether a surge high voltage is generated on the power bus according to the bus voltage of the power bus VBAT, and output a control signal according to the detection result; the switch circuit 12 includes a first triode Q3 and a field effecttransistor Q1, The base of the first transistor Q3 is connected to the output terminal of the surge detection circuit, the collector of the first transistor Q3 is connected to the grid g of the field effect transistor, the emitter of the first transistor Q3 is grounded to PGND, and the field The drain d and source s of the effect transistor are connected to the power bus between the power ...
Embodiment 2
[0063] According to an embodiment of the present invention, an embodiment of a surge protection method is provided, the surge protection method is applied to a power line of a target device with a withstand voltage value lower than a preset value, Figure 4 It is a flowchart of a control method of a surge protection circuit according to an embodiment of the present invention, such as Figure 4 As shown, the above methods include:
[0064] Step S401, judging whether a high voltage surge occurs on the power line.
[0065] Step S402, when the power line generates a high voltage surge, the control target device is disconnected from the power line.
[0066] The target device mentioned above is a device with a relatively low withstand voltage in the circuit that requires surge protection, including but not limited to components, modules, equipment and loads connected to the above power line and whose withstand voltage value is lower than the preset value, for example, the target T...
Embodiment 3
[0072] According to an embodiment of the present invention, an embodiment of a battery power supply circuit is provided, including: the above-mentioned surge protection circuit.
[0073] figure 2 A schematic diagram of an optional battery-powered circuit, such as figure 2 As shown, the above-mentioned battery-powered circuit also includes a battery, an emergency stop switch and a motor, and a target device that requires surge protection, and the above-mentioned target devices are low withstand voltage loads RL1 and RL2. The surge protection circuit is arranged between the power supply input VBAT_IN of the battery power supply circuit and the power supply ports VBAT_OUT of the loads RL1 and RL2 to be protected. When there is a surge high voltage on the battery bus, the surge protection circuit is disconnected to disconnect the target device from the battery bus, thereby realizing the protection of the target device.
[0074] The serial numbers of the above embodiments of th...
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Abstract
The invention discloses a surge protection circuit and a battery power supply circuit. The surge protection circuit comprises a surge detection circuit which is used for detecting whether a surge high voltage is generated on a power supply bus according to a busvoltage of the power supply bus and outputting a control signal according to a detection result and a switching circuit comprising a first triode and a field-effect tube; a base electrode of the first triode is connected to the output end of the surge detection circuit, a collector electrode of the first triode is connected with a grid electrode of the field-effect tube, an emitting electrode of the first triode is grounded, and a drain electrode and a source electrode of the field-effect tube are connected in series to a power supply bus between the power supply and the target device. Under the condition that surge high voltage is generated on the power bus, the first triode is used for controlling the field effecttransistor to be turned off according to the control signal so as to control the target device to be disconnected from the power bus. The technical problem that the circuit cost is high due to the fact that the device is prevented from being damaged by surge high voltage by improving the withstand voltage value of the device or adding a surge absorption module is solved.
Description
technical field [0001] The invention relates to the technical field of circuits, in particular to a surge protection circuit, a surge protection method and a battery power supply circuit. Background technique [0002] Unmanned vehicles usually use high-power motors to drive wheels or other actuators, and the motors are directly powered by the battery bus VBAT. When the unmanned vehicle encounters special conditions (such as out of control, emergency stop, etc.), the power supply input of the battery will be disconnected from the circuit suddenly, causing the motor to suddenly lose power, which will cause the coil in the motor to produce a reaction that lasts longer than microseconds. To the surge high voltage, or the unmanned vehicle will continue to move forward due to inertia, or the unmanned vehicle is dragged by an external force. At this time, the wheels drive the motor, and the motor will generate a surge high voltage that lasts for more than 1 second. In addition, the...
Claims
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Application Information
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