Leakage protection improvement circuit of high-power load

Abstract

The utility model relates to the technical field of leakage protection circuits, in particular to a leakage protection improvement circuit of a high-power load, which is characterized in that a first input end of an input module is connected with a live wire, and a second input end of the input module is connected with a zero wire; the first output end of the input module is connected with the live wire end of the leakage protector, and the second output end of the input module is connected with the zero wire end of the leakage protector; and the zero line end of the leakage protector is also grounded through a grounding control switch of the control module. In order to solve the problem that a leakage protection circuit in the prior art is easily triggered by mistake when a part of high-power equipment is operated, a group of control modules is introduced in the scheme to control a ground loop of a leakage protector. When high-power equipment which may cause false triggering exists, the control module cuts off the zero line to ground loop, so that the leakage protector fails to avoid false triggering.

Description

Technical Field

[0001] The utility model relates to the technical field of leakage protection circuits, in particular to a leakage protection improvement circuit for high-power loads. Background Art

[0002] A leakage current protector (RCD) is a device used to protect against electric shock and leakage in circuits. If a line or device experiences a ground leakage or an electric shock, it automatically disconnects the circuit, effectively protecting both personnel and the circuit. Typically, a RCD consists of an induction coil and a switch. When the induction coil senses leakage current, the switch activates, disconnecting the circuit.

[0003] For example, Chinese patent CN201611228163.0 discloses a leakage protector, which relates to the field of leakage protection technology. The leakage protector includes: a controller, a leakage protection control module, a zero-sequence leakage detection transformer, and a zero-sequence leakage self-test circuit; the zero-sequence leakage detection transformer, the leakage protection control module, and the controller are connected in sequence, and the zero-sequence leakage self-test circuit is connected to the controller. When the zero-sequence leakage self-test circuit is turned on, the zero-sequence leakage detection transformer sends a trigger signal to the leakage protection control module, so that the controller can perform a self-test on the zero-sequence leakage detection transformer, solving the safety hazards caused by human negligence, failure to conduct test operations, unreasonable installation location (such as hidden installation), and too few periodic test frequencies. It also implements program self-test, adds self-test during operation, and self-test on power-on, eliminating the continued use of the leakage protection device due to damage without knowledge, thereby improving safety.

[0004] However, during actual implementation, the inventors found that when certain high-power devices exist in the downstream circuit, it is easy for a certain surge to appear on the neutral and live lines, which can be sensed by the mutual inductor and cause the leakage protector to malfunction, affecting the normal use of the equipment. Utility Model Content

[0005] In view of the above problems existing in the prior art, a leakage protection improvement circuit for high-power loads is provided.

[0006] The specific technical solutions are as follows:

[0007] A leakage protection improvement circuit for high-power loads, comprising an input module, a leakage protector and a control module;

[0008] The first input terminal of the input module is connected to the live wire, and the second input terminal of the input module is connected to the neutral wire;

[0009] The first output end of the input module is connected to the live wire end of the leakage protector, and the second output end of the input module is connected to the neutral wire end of the leakage protector;

[0010] The neutral terminal of the leakage protector is also grounded via the grounding control switch of the control module.

[0011] On the other hand, the input module includes a primary mutual inductor and a secondary mutual inductor connected in sequence;

[0012] Two ends of the front winding of the primary transformer are respectively connected to the first input end and the second input end of the input module;

[0013] The two ends of the rear winding of the primary transformer are respectively connected to the two ends of the front winding of the secondary transformer;

[0014] The secondary winding of the secondary transformer is connected to the first output terminal and the second output terminal of the input module respectively.

[0015] On the other hand, the control module includes:

[0016] A switch control module, wherein a control end of the switch control module is connected to an external host computer;

[0017] The control end of the ground control switch is connected to the control signal output end of the switch control module.

[0018] On the other hand, the switch control module includes:

[0019] a transistor, wherein the emitter of the transistor is connected to the power supply circuit, the base of the transistor is connected to the control end of the switch control module, and the collector of the transistor is connected to the control signal output end of the switch control module;

[0020] A first resistor, wherein a first end of the first resistor is connected to the emitter of the transistor, and a second end of the first resistor is connected to the base of the transistor.

[0021] On the other hand, the switch control module includes:

[0022] A second resistor, wherein a first end of the second resistor is connected to the base of the transistor, and a second end of the second resistor is connected to the control end of the switch control module.

[0023] On the other hand, the grounding control switch includes:

[0024] a coil, wherein a first end of the coil is connected to the control end of the ground control switch, and a second end of the coil is grounded;

[0025] a circuit breaker, wherein a first end of the circuit breaker is connected to an input end of the grounding control switch, and a second end of the circuit breaker is grounded;

[0026] The direction of the magnetic lines of force of the coil points to the circuit breaker.

[0027] On the other hand, the control module further includes:

[0028] A first diode, wherein a cathode of the first diode is connected to the control signal output end of the switch control module, and an anode of the first diode is grounded.

[0029] On the other hand, the control module further includes:

[0030] A first capacitor, wherein a cathode of the first capacitor is connected to the control signal output terminal of the switch control module, and an anode of the first capacitor is grounded.

[0031] On the other hand, the grounding control switch is grounded through a connection device housing.

[0032] The above technical solution has the following advantages or beneficial effects:

[0033] To address the problem of existing leakage protection circuits being prone to false triggering when operating certain high-power devices, this solution introduces a control module to control the ground circuit of the leakage protector. When a high-power device that could cause false triggering is present, the control module disconnects the neutral line from the ground circuit, rendering the leakage protector inoperable and preventing false triggering. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The embodiments of the present invention will be described more fully with reference to the accompanying drawings, which are for illustration and description only and are not intended to limit the scope of the present invention.

[0035] Figure 1 It is an overall schematic diagram of an embodiment of the utility model; DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0039] The utility model includes:

[0040] A leakage protection improvement circuit for high power loads, such as Figure 1 As shown, it includes an input module 1, a leakage protector 2 and a control module 3;

[0041] The first input terminal of the input module 1 is connected to the live wire AC1, and the second input terminal of the input module 1 is connected to the neutral wire AC2;

[0042] The first output terminal of the input module 1 is connected to the live wire terminal L of the leakage protector 2, and the second output terminal of the input module is connected to the neutral wire terminal N of the leakage protector 2;

[0043] The neutral terminal of the leakage protector 2 is also grounded via the grounding control switch K1 of the control module 3 .

[0044] Specifically, to address the problem that the leakage protection circuit in the prior art is easily triggered by mistake when operating some high-power equipment, this embodiment introduces a set of control modules 3, which include a grounding control switch K1 for controlling the ground circuit of the leakage protector 2.

[0045] Typically, the leakage protector 2 is equipped with a corresponding zero-sequence mutual inductor, which senses the leakage current on the line by connecting the neutral line and the live line through the input module 1. To achieve a better sensing effect, the neutral line needs to be effectively grounded.

[0046] When there is a high-power device, the control module 3 disconnects the grounding control switch K1 so that the neutral terminal of the leakage protector 2 cannot be effectively grounded. At this time, the leakage protector 2 fails and will not malfunction.

[0047] In one embodiment, the input module 1 includes a primary transformer T1 and a secondary transformer T2 connected in sequence;

[0048] The two ends of the front winding of the primary transformer T1 are connected to the first input terminal and the second input terminal of the input module 1 respectively;

[0049] The two ends of the rear winding of the primary transformer T1 are respectively connected to the two ends of the front winding of the secondary transformer T2;

[0050] The secondary winding of the secondary transformer T2 is connected to the first output terminal and the second output terminal of the input module 1 respectively.

[0051] Specifically, to adapt the input voltage of the leakage protector 2 , in this embodiment, a primary transformer T1 and a secondary transformer T2 connected to each other are provided to implement step-by-step voltage reduction so that the input voltage meets the input range of the leakage protector 2 .

[0052] In one embodiment, the control module 3 includes:

[0053] A switch control module 31, wherein the control end of the switch control module 31 is connected to an external host computer 4;

[0054] The control end of the ground control switch K1 is connected to the control signal output end of the switch control module 31 .

[0055] Specifically, in order to achieve a better remote control process, in this embodiment, a switch control module 31 is also set in the control module 3. The switch control module 31 is connected to the remote host computer 4. The host computer 4 generates a corresponding signal to enable the switch control module 31 to cut off the grounding control switch K1, thereby achieving a better remote control effect.

[0056] In one embodiment, the switch control module 31 includes:

[0057] A transistor Q1, wherein the emitter of the transistor Q1 is connected to the power supply circuit, the base of the transistor Q1 is connected to the control end of the switch control module 31, and the collector of the transistor Q1 is connected to the control signal output end of the switch control module;

[0058] A first resistor R1 , wherein a first end of the first resistor R1 is connected to the emitter of the transistor Q1 , and a second end of the first resistor R1 is connected to the base of the transistor Q1 .

[0059] Specifically, to achieve better switching control, in this embodiment, a transistor Q1 is provided in the switch control module 31. The emitter of transistor Q1 serves as an input terminal connected to the power supply circuit, and a first resistor R1 is used to divide the voltage to provide a certain base voltage. When the host computer 4 sends a corresponding high-level signal, the base voltage of transistor Q1 rises, causing transistor Q1 to operate in the amplification region, generating current that drives the ground control switch K1 to open.

[0060] In one embodiment, the switch control module includes:

[0061] The second resistor R2 has a first end connected to the base of the transistor Q1 , and a second end connected to the control end of the switch control module 1 .

[0062] Specifically, to control the base voltage of the transistor Q1 , a second resistor R2 is provided in this embodiment as a pull-up resistor so that the high-level signal output by the host computer 4 can be applied to the base of the transistor Q1 to turn on the transistor Q1 .

[0063] In one embodiment, the grounding control switch K1 includes:

[0064] A coil K11, wherein a first end of the coil K11 is connected to a control end of a ground control switch, and a second end of the coil K11 is grounded;

[0065] a circuit breaker K12, wherein a first terminal of the circuit breaker K12 is connected to an input terminal of the grounding control switch K11, and a second terminal of the circuit breaker K12 is grounded;

[0066] The direction of the magnetic lines of force of the coil K11 points to the circuit breaker K12.

[0067] Specifically, to achieve a better disconnection effect, in this embodiment, a coil K11 and a circuit breaker K12 are provided in the grounding control switch K1. The circuit breaker K12 is a single-pole, single-throw switch. When the coil K11 is energized, the circuit breaker K12 is attracted, causing it to open. When the coil K11 is de-energized, the circuit breaker K12 is reset by a spring, reconnecting the ground circuit.

[0068] In one embodiment, the control module 3 further includes:

[0069] The first diode D1 has a cathode connected to the control signal output terminal of the switch control module 31 and an anode connected to the ground.

[0070] Specifically, in order to achieve a better voltage stabilization effect, in this embodiment, a reverse first diode D1 is provided in the control module 3 to control the voltage across both ends of the ground control switch K1 .

[0071] In one embodiment, the control module 3 further includes:

[0072] The first capacitor C1 has a cathode connected to the control signal output terminal of the switch control module 31 and an anode connected to the ground.

[0073] Specifically, in order to achieve a better filtering effect, in this embodiment, a first capacitor C1 is further provided in the control module 3 for filtering.

[0074] In one embodiment, the grounding control switch is connected to ground via a connection to the device housing.

[0075] Specifically, in order to achieve good grounding, in this embodiment, the rear stage of the grounding control switch K1 is connected to the device housing to achieve good grounding.

[0076] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A leakage protection improvement circuit for high-power loads, characterized in that: Including input module, leakage protector and control module; The first input terminal of the input module is connected to the live wire, and the second input terminal of the input module is connected to the neutral wire; The first output end of the input module is connected to the live wire end of the leakage protector, and the second output end of the input module is connected to the neutral wire end of the leakage protector; The neutral terminal of the leakage protector is also grounded via the grounding control switch of the control module.

2. The leakage protection improvement circuit according to claim 1, characterized in that: The input module includes a primary mutual inductor and a secondary mutual inductor connected in sequence; Two ends of the front winding of the primary transformer are respectively connected to the first input end and the second input end of the input module; The two ends of the rear winding of the primary transformer are respectively connected to the two ends of the front winding of the secondary transformer; The secondary winding of the secondary transformer is connected to the first output terminal and the second output terminal of the input module respectively.

3. The leakage protection improvement circuit according to claim 1, characterized in that: The control module includes: A switch control module, wherein a control end of the switch control module is connected to an external host computer; The control end of the ground control switch is connected to the control signal output end of the switch control module.

4. The leakage protection improvement circuit according to claim 3, characterized in that: The switch control module includes: a transistor, wherein the emitter of the transistor is connected to the power supply circuit, the base of the transistor is connected to the control end of the switch control module, and the collector of the transistor is connected to the control signal output end of the switch control module; A first resistor, wherein a first end of the first resistor is connected to the emitter of the transistor, and a second end of the first resistor is connected to the base of the transistor.

5. The leakage protection improvement circuit according to claim 4, characterized in that: The switch control module includes: A second resistor, wherein a first end of the second resistor is connected to the base of the transistor, and a second end of the second resistor is connected to the control end of the switch control module.

6. The leakage protection improvement circuit according to claim 3, characterized in that: The grounding control switch includes: a coil, wherein a first end of the coil is connected to the control end of the ground control switch, and a second end of the coil is grounded; a circuit breaker, wherein a first end of the circuit breaker is connected to an input end of the grounding control switch, and a second end of the circuit breaker is grounded; The direction of the magnetic lines of force of the coil points to the circuit breaker.

7. The leakage protection improvement circuit according to claim 3, characterized in that: The control module further includes: A first diode, wherein a cathode of the first diode is connected to the control signal output end of the switch control module, and an anode of the first diode is grounded.

8. The leakage protection improvement circuit according to claim 3, characterized in that: The control module further includes: A first capacitor, wherein a cathode of the first capacitor is connected to the control signal output terminal of the switch control module, and an anode of the first capacitor is grounded.

9. The leakage protection improvement circuit according to claim 1, characterized in that: The grounding control switch is grounded through a connection device housing.

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