Leakage protection power regulator

Abstract

The utility model discloses an electric leakage protection power regulator comprising an electric leakage collector, a protection circuit, a filter circuit, a power controller and a load which are connected in sequence. The electric leakage collector adopts a residual current transformer; the protection circuit is realized by adopting an inductor; the filter circuit adopts an RC filter circuit; the power controller is realized by adopting an operational amplifier LM324 chip, the in-phase end of the LM324 chip is connected with an input resistor R8 and a reference resistor, the anti-phase end of the LM324 chip is connected with an input resistor, and the output end of the LM324 chip is connected with a load through a group of series resistors. The utility model has the advantages of cable saving, simple logic, few required parts, built-in temperature control, short electric leakage continuous line, strong anti-interference capability and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of leakage protection, and in particular relates to a leakage protection power regulator. Background Art

[0002] Leakage protection is a safety protection measure designed to prevent electric shock accidents caused by leakage current of the power grid or electrical equipment exceeding a certain set value. When the leakage current exceeds the set value, the leakage protection device can automatically cut off the power supply or send out an alarm signal to protect the safety of the power user.

[0003] The power regulator is usually used as a panel-mounted power adjustment unit. It has many functions, such as environmental protection system, automatic power adjustment, constant power control, current limiting function, and startup output limit use function.

[0004] Currently, leakage protection requires external protection devices or tripping. The current setting is not flexible, and the connecting wires are long and easily interfered by high-current power lines. The tripping also requires additional drives and more circuits. Summary of the invention

[0005] The utility model aims to provide a leakage protection power regulator, which sets power regulator parameters to adjust current values, has flexible current settings and simple circuits.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A leakage protection power regulator, comprising a leakage collector, a protection circuit, a filter circuit, a power controller and a load connected in sequence;

[0008] The leakage collector adopts a residual current transformer;

[0009] The protection circuit is implemented by inductance;

[0010] The filter circuit adopts an RC filter circuit;

[0011] The power controller is implemented by an operational amplifier LM324 chip. The in-phase end of the LM324 chip is connected to an input resistor R8 and a reference resistor, the inverting end is connected to an input resistor, and the output end is connected to the load through a group of series resistors.

[0012] The utility model has the advantages of saving cables, simple logic, fewer required components, built-in temperature control, short leakage continuous line, and strong anti-interference ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the circuit structure of the utility model.

[0014] Markings in the figure: 1. Leakage current collection terminal; 2. Protection input terminal; 3. Filter circuit; 4. Power controller; 5. Load. DETAILED DESCRIPTION

[0015] like Figure 1 As shown, a leakage protection power regulator provided in this embodiment includes a leakage collector, a protection circuit, a filtering circuit, a power controller and a load connected in sequence. The leakage collector is used to collect leakage current values. This embodiment is implemented by a residual current transformer. The residual current transformer is connected to the leakage collection terminals AI1 and AI2 to send the leakage current value to the power controller. A protection circuit and a filtering circuit are provided between the power controller and the leakage collector. The protection circuit is implemented by inductors L1 and L2 and is used for current mutation and overvoltage protection. The filtering circuit adopts an RC filtering circuit. The RC filtering circuits C7, C8, R4 and R5 can filter out interference signals and realize association with the signals.

[0016] The power controller is implemented by using the operational amplifier LM324 chip U3.2, and the operational amplifier LM324 chip U3.2 is used to realize signal acquisition and impedance matching; Figure 1 As shown, the LM324 chip U3.2 uses resistor R8 at the same phase end to input the signal, resistor R10 uses the reference signal as the input, and resistor R7 uses the inverting phase end to input the signal to implement a subtractor. The differential signal is input, amplified by resistor R9, filtered by capacitor C12, and output to the load through resistor R13 and resistor R26 in series.

[0017] When the insulation of electrical equipment is good and the circuit is working normally, no matter whether the three-phase load is balanced or not, the phase sum of the current of each phase is equal to zero, and the phase sum of the magnetic flux induced by the working current of each phase in the ring core of the current transformer of the detection element is also equal to zero. At this time, there is no induced voltage output from the secondary coil of the residual current transformer, and the power regulator outputs normally. When the protected electrical equipment is damaged or there is other ground leakage fault, part of the current will flow back to the neutral point through the PE line, the grounding line or the human body, so that the phase sum of the three-phase current is not equal to zero, and the phase sum of the magnetic flux induced in the ring core of the residual current transformer is also not equal to zero; the power controller stops outputting.

[0018] The leakage current value can be adjusted by setting the power regulator parameters. When the input current value reaches the set value, the power regulator will immediately alarm and stop output, achieving the purpose of real-time leakage alarm and protecting equipment and life safety.

[0019] The above is only a preferred implementation of the utility model, but the protection scope of the utility model is not limited thereto, and any modification and replacement based on the technical solution and utility model concept provided by the utility model should be included in the protection scope of the utility model.

Claims

1. A leakage protection power regulator, characterized in that: It includes a leakage collector, a protection circuit, a filter circuit, a power controller and a load connected in sequence; The leakage collector adopts a residual current transformer; The protection circuit is implemented by inductance; The filter circuit adopts an RC filter circuit; The power controller is implemented by an operational amplifier LM324 chip. The in-phase end of the LM324 chip is connected to an input resistor R8 and a reference resistor, the inverting end is connected to an input resistor, and the output end is connected to the load through a group of series resistors.

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