Safe power-on protection circuit system
A technology for protecting circuits and power systems, which is applied in the direction of electrical program control, sequence/logic controller program control, etc., can solve problems such as hidden dangers in electricity use, electric shock, etc., to improve electricity use safety, ensure electricity use safety, The effect of preventing accidental electric shock accidents
Active Publication Date: 2019-06-14
PLA NO 5719 FACTORY +1
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Problems solved by technology
[0002] At present, power supply systems closely related to people's lives, such as household power supplies and public place power supplies, are not designed with protection circuits to achieve no current output when the system is not in use. This has caused potential safety hazards in power consumption to a certain extent. Inserting metal objects into electrical outlets can cause electric shock
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[0011] refer to figure 1 , figure 2 . In the embodiments described below, the safety power-on protection circuit system includes an intelligent detection circuit connected to the output end of the power system and a power socket provided with a micro switch. The intelligent detection circuit includes a current-limiting resistor R1 that is electrically connected to the zero line and the live line of the power system symmetrically, two parallel diodes D connected in parallel at the output of the current-limiting resistor R1, a capacitor C, and a parallel circuit of the resistor R2, and the two capacitors C , The parallel circuit of resistor R2 is electrically connected to the microcontroller through an inverting Schmitt trigger. Diodes can be BAS70-04(74s). Schmitt trigger circuit (abbreviation) is a waveform shaping circuit. When any waveform signal enters the circuit, the output will jump between positive and negative saturation to generate square wave or pulse wave output...
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The invention provides a safety energizing protection circuit system which comprises an intelligent detection circuit connected with the output end of a power system and power sockets provided with micro-switches. The intelligent detection circuit comprises a current-limiting resistor R1 electrically connected to the null line and the live line of the power system in a mirror symmetry mode, two same-directional serially-connected diode D, capacitors C and a resistor R2 parallel connection loop, wherein the two same-directional serially-connected diode D and the capacitors C are in parallel connection with the output end of the current-limiting resistor R1, and the two capacitors C and the resistor R2 parallel connection loop are electrically connected with a microcontroller through inverse-phase Schmitt triggers. 5VDC voltage signals from the micro-switches are converted into jitter-free output signals through the inverse-phase Schmitt triggers, and the jitter-free output signals are sent to the microcontroller. When the micro-switches in the jacks of the two power sockets are closed, a 5VDC detection signal 1 and a 5VDC detection signal 2 are sent out respectively, otherwise, a detection signal 1 and a detection signal 2 with zero output signal voltage are sent out, and an internal control program of the microcontroller judges whether the time difference of the signals is within 50 ms or not according to the detected current signals of the two power sockets.
Description
technical field [0001] The invention relates to a method for safe power-on protection of a power supply system. The feature of the invention is to design a detection circuit to detect the feedback signal on the power line. Only when the system receives the signal from the line within 50ms, the power system will provide power. Output, under normal circumstances, the output of the power system is cut off, effectively ensuring the safety of the power system. Background technique [0002] At present, power supply systems closely related to people's lives, such as household power supplies and public place power supplies, are not designed with protection circuits to achieve no current output when the system is not in use. This has caused potential safety hazards in power consumption to a certain extent. Inserting a metal object into an electrical outlet can cause electric shock. The magnitude of the current passing through the human body depends on the applied voltage and the res...
Claims
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IPC IPC(8): G05B19/04
CPCG05B19/04
Inventor 张百涛向巧李整建谢旭东周群陈建
Owner PLA NO 5719 FACTORY