Full-automatic over-voltage and under-voltage time-delaying protector
A protector, overvoltage and undervoltage technology, which is applied in the direction of automatic disconnection emergency protection device, protection for undervoltage or no voltage response, emergency protection circuit device, etc., which can solve the problem of unstable operation of the protector and poor stability of components and other problems, to achieve the effect of simple structure, stable and reliable performance, and perfect functions
Inactive Publication Date: 2013-04-17
张增乐
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Problems solved by technology
Existing protectors usually include a voltage sampling unit, an amplification unit, a comparison unit, and an operating actuator, but they are basically composed of discrete components, and the stability of the components is poor, resulting in unstable operation of the existing protectors.
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[0010] Such as figure 1 As shown, the fully automatic overvoltage and undervoltage time-delay protector includes a voltage sampling unit, an actuator, a rectification and stabilization unit, and a control unit. The rectification and stabilization unit includes an RC parallel step-down circuit and a full-wave rectification circuit. The RC parallel step-down circuit composed of resistor R1 and capacitor C1 and the full-wave rectifier circuit composed of diodes D1-D4 are connected between the two AC input terminals L and N, and the output terminal of the full-wave rectifier circuit is connected with a regulator tube D5 and a filter capacitor C2 provides DC power supply for the control unit and the actuator. The control unit uses the single-chip integrated circuit U1 as the core, such as image 3 As shown, the monolithic integrated circuit U1 is provided with an A / D converter, a timer, a set voltage memory, a real-time voltage memory and a comparator, and the output of the voltage...
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The invention relates to a full-automatic over-voltage and under-voltage time-delaying protector, which comprises a voltage sampling unit, an execution mechanism and a control unit. A monolithic integrated circuit serves as the core of the control unit, and an analogue / digital (A / D) converter, a timer, a set voltage storage device, a real-time voltage storage device and a comparator are arranged in the monolithic integrated circuit, wherein the real-time voltage storage device is used for storing a voltage value of external alternating current power converted by the A / D converter; the comparator is used for comparing numerical values in the set voltage storage device and the real-time voltage storage device; and the timer is used for recording cumulative time after the alternating current power is recovered to be normal. The monolithic integrated circuit controls the execution mechanism according to a comparison result and the cumulative time of the timer. The monolithic integrated circuit serves as the core of the control unit, so that the protector is simple in structure, and is more stable and reliable in performance; and moreover, power can be automatically supplied to an electrical appliance after voltage is recovered to be normal, so that the protector is more complete in function.
Description
technical field [0001] The invention relates to a low-voltage protection device, in particular to a fully automatic overvoltage and undervoltage time-delay protector. Background technique [0002] Over-voltage and under-voltage delay protectors are commonly used circuit protection components. They are often used in electrical equipment or household power supply systems as a protection device. When the power supply voltage is too high or too low, such as in a three-phase four-wire system The disconnection of the neutral wire and the protective neutral wire in the system will cause the neutral point shift on the load side. When the neutral point shift is serious, the single-phase circuit will be severely over-voltage or under-voltage, causing the single-phase Electrical equipment may even endanger personal safety. At this time, in order to protect the safety of electrical appliances in the line and avoid failure or damage caused by abnormal power supply, the protector will cut...
Claims
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IPC IPC(8): H02H3/24H02H3/06
Inventor 张增乐
Owner 张增乐