A detection circuit and detection method for reliable grounding judgment of AC power supply protection ground
A technology of AC power supply and protection ground, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, etc. It can solve the problems of AC power equipment damage and endanger the personal safety of operators, so as to ensure reliable use, fast judgment, and personal safety protection. safe effect
Active Publication Date: 2018-08-28
东文高压电源(天津)股份有限公司
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Problems solved by technology
[0002] The output voltage of the high-voltage power supply used in many application fields is generally very high, about 20KV or more. If the output ground of the high-voltage power supply is not connected to the input protection ground of the AC power supply, the output high voltage is in a suspended state relative to the ground, and it is easy to cause damage to the high-voltage power supply. Internal and AC electrical equipment cause damage, and even endanger the personal safety of the operator, this problem is often ignored by the majority of users
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[0014] Such as figure 1 , 2 As shown, a detection circuit for reliable grounding determination of the AC power supply protection ground includes an input "fire-ground" voltage detection and control circuit, an input "fire-neutral" step-down circuit, and an output control and indication circuit.
[0015] The input "fire-neutral line" step-down circuit is respectively connected with the input "fire-ground" voltage detection and control circuit and the output control and indication circuit.
[0016] In the above-mentioned input "fire-ground" voltage detection and control circuit, the resistor R3 and the resistor R4 are connected in parallel with the capacitor C4 in series, and one end of the capacitor C4 is respectively connected with the live wire L of the AC power supply input terminal J1 and the 12 pin of the relay relay1 , the other end of the capacitor C4 is respectively connected to the negative pole of the rectifier diode D6 and the positive pole of the diode D5, after th...
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The invention relates to an AC power supply protection earth reliable earthing judgment detection circuit and detection method. When a relay1 is closed, AC power supply passes through a live-null wire voltage reduction circuit, and through matching of capacitance values of a capacitor C2, a capacitor C2 and a capacitor C3, voltage capable of enabling contact points of a relay 2 and a relay 3 to act is obtained, and an output control and indicating circuit is controlled; when an indicator light D10 is on, reliable earthing is achieved, and the output end has an AC output voltage; and when the indicator light D10 is off, earthing is unreliable, and the output end has no AC output voltage. The beneficial effects are that the circuit is simple, can detect earthing state in real time, is fast and accurate in result judgment and is convenient to use. When user equipment is not connected to the safety protection earth reliably in the use process, the circuit in the invention can carry out power-off protection on the equipment to prevent damage thereto, so that reliable use of the user equipment is guaranteed, personal safety of operators can be ensured.
Description
technical field [0001] The invention relates to a detection circuit and a detection method for reliable grounding determination of AC power supply protection grounds of widely used various high-voltage power sources in the fields of medical treatment, industry, environmental protection and the like. Background technique [0002] The output voltage of the high-voltage power supply used in many application fields is generally very high, about 20KV or more. If the output ground of the high-voltage power supply is not connected to the input protection ground of the AC power supply, then the output high voltage is in a suspended state relative to the ground, and it is easy to cause damage to the high-voltage power supply. Internal and AC electrical equipment cause damage, and even endanger the personal safety of the operator. This problem is often ignored by the majority of users. Therefore, when the high-voltage power supply is in use, the output ground of the high-voltage power...
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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 申晓景
Owner 东文高压电源(天津)股份有限公司