A large current sheet current transformer with angle difference compensation

Abstract

This invention relates to a high-current-weighted current transformer with phase difference compensation. It comprises a housing, within which a current-carrying frame is housed. A ring-shaped magnetic core is fitted onto the current-carrying frame, and the ring-shaped magnetic core has a notch. A coil is wrapped around the ring-shaped magnetic core. The current-carrying frame passes through the ring-shaped magnetic core and connects to an external current source. The housing also contains a current acquisition circuit board and a pin holder. An interface pin is provided on the pin holder. One end of the interface pin is connected to the output interface of the current acquisition circuit board via a phase difference compensation module, and the other end is connected to an interface of an external testing device. This invention incorporates a thermistor. When an abnormal temperature occurs, the control mechanism of the current acquisition circuit board will activate, ensuring the safe operation of the current transformer. The phase difference compensation circuit avoids inaccurate measurement due to current disturbances, improving the measurement accuracy of the current transformer.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, and specifically to a large current-strip current transformer with phase angle compensation. Background Technology

[0002] Current transformers are used for AC metering and detection and are an important component of current metering equipment. Generally, current transformers only have analog output functionality, which poses a safety hazard to computing equipment. Traditional current transformers have outdated structures and lack phase angle compensation circuits. Furthermore, their design did not consider the safety hazards caused by electromagnetic interference, leading to inaccurate metering of external currents in environments with interference. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, a high-current-size current transformer with phase angle compensation is proposed. This current transformer features a novel structure, incorporating a temperature sensor embedded within the current-carrying frame. The temperature sensor is connected to the current acquisition circuit board via a signal line. A thermistor is tightly fitted to the current-carrying frame. When an abnormal temperature occurs, the control mechanism of the current acquisition circuit board activates, ensuring the safe operation of the current transformer. The phase angle compensation circuit of this invention connects two reverse reference diodes and is connected to the output of the operational amplifier through a circuit consisting of a compensation resistor and a filter capacitor. The output is filtered by the capacitor, significantly avoiding inaccurate measurement due to current disturbances and improving the measurement accuracy of the current transformer.

[0004] The technical solution of this invention is as follows: a high-current sheet current transformer with phase difference compensation, comprising a housing, a current-carrying frame inside the housing, a ring-shaped magnetic core sleeved on the current-carrying frame, the ring-shaped magnetic core having a notch, and a coil wrapped around the ring-shaped magnetic core; the current-carrying frame passing through the ring-shaped magnetic core and connecting to an external current source; a current acquisition circuit board and a pin holder inside the housing, an interface pin on the pin holder, one end of the interface pin being connected to the output interface of the current acquisition circuit board through a phase difference compensation module, and the other end being connected to an interface of an external testing device.

[0005] The housing includes an upper housing and a lower housing, both of which are semi-circular. The needle holder is disposed on the outer arc surface of the lower housing. The acquisition circuit board is located on the inner side of the lower housing. A detector is disposed on the acquisition circuit board at the notch of the annular magnetic core. The current carrier has a U-shaped structure, including a current carrier arm and a bottom arm. The annular magnetic core is fitted onto the bottom arm. The current carrier arm has a housing slot, and a current carrier terminal is located at the top of the current carrier arm, with a terminal slot on the terminal.

[0006] The current carrier rack is provided with a current carrier rack shielding sleeve on its exterior.

[0007] Preferably, the edge of the upper housing has an outwardly protruding rib, and the edge of the lower housing has an inwardly protruding rib, with the outwardly protruding rib and the inwardly protruding rib locked together.

[0008] Preferably, a flow carrier positioning post is provided on the side of the lower housing, and a flow carrier positioning post is provided at a corresponding position on the side of the upper housing.

[0009] Preferably, the angle difference compensation module is provided with an angle difference compensation circuit. The output terminal of the current transformer is connected to the input terminal of the angle difference compensation circuit through a signal line. The input terminal passes through an operational amplifier and the angle difference compensation circuit, and is then filtered by a capacitor before being output.

[0010] Preferably, the angle difference compensation circuit connects two reverse reference diodes and is connected to the output terminal of the operational amplifier through a circuit consisting of a compensation resistor and a filter capacitor.

[0011] The current carrier hole is provided with a current carrier hole, and a temperature sensor is embedded in the current carrier hole. The temperature sensor is connected to the current acquisition circuit board through a signal line.

[0012] The temperature sensor is a thermistor.

[0013] Beneficial effects of this invention:

[0014] 1) The present invention has a novel structure. The semi-circular upper shell (3) and lower shell (4) structure greatly improve the electromagnetic shielding effect, enabling the high current circuit to achieve accurate measurement in a shielded environment.

[0015] 2) The present invention exchanges information with external devices through interface pins (5), which greatly improves the data transmission efficiency; 3) The present invention embeds a temperature sensor in the hole of the current carrier, and the temperature sensor is connected to the current acquisition circuit board through a signal line. The thermistor is in close contact with the current carrier. When the temperature is abnormal, the control mechanism of the current acquisition circuit board will take action to ensure the safe operation of the current transformer.

[0016] 4) The angle difference compensation circuit of the present invention connects two reverse reference diodes and is connected to the output terminal of the operational amplifier through a circuit composed of a compensation resistor and a filter capacitor. After being filtered by the capacitor, the output is output, which greatly avoids the occurrence of inaccurate measurement due to current disturbance and improves the measurement accuracy of the current transformer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 for Figure 1 A top-down view;

[0019] Figure 3 for Figure 2 Side view;

[0020] Figure 4 This is a schematic diagram of the conductive terminal structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the current carrier shielding sleeve structure;

[0022] Figure 6 This is a schematic diagram of the lower shell structure of the present invention;

[0023] Figure 7 This is a schematic diagram showing the positional relationship between the flow carrier and the lower shell of the present invention;

[0024] Figure 8 This is a schematic diagram showing the relationship between the current-carrying frame shielding sleeve and the lower shell of the present invention;

[0025] Figure 9 This is a schematic diagram showing the positional relationship between the flow carrier and the upper shell of the present invention;

[0026] Figure 10 This is a schematic diagram of the circuit with angle difference compensation of the present invention.

[0027] In the figure, 1 is the current carrier terminal; 2 is the current carrier arm; 3 is the upper housing; 4 is the lower housing; 5 is the interface pin; 6 is the pin seat; 7 is the current carrier shielding sleeve; 8 is the housing slot; 9 is the terminal slot; 10 is the current carrier positioning post; 11 is the current carrier hole; 12 is the outer protruding ridge; and 13 is the inner protruding ridge. Detailed Implementation

[0028] See Figures 1 to 10 As shown, the present invention includes a housing, within which a current-carrying frame is provided, and a ring-shaped magnetic core is fitted onto the current-carrying frame. The ring-shaped magnetic core has a notch, and a coil is wrapped around the ring-shaped magnetic core. The current-carrying frame passes through the ring-shaped magnetic core and connects to an external current source. The housing contains a current acquisition circuit board and a pin holder (6), and the pin holder has an interface pin (5), such as... Figure 2 As shown, one end of the interface pin (5) is connected to the output interface of the current acquisition circuit board through an angle difference compensation module, and the other end is connected to the interface of an external testing device. The housing includes an upper housing (3) and a lower housing (4), as shown... Figure 1As shown, the upper housing (3) and lower housing (4) are semi-circular housings. The needle seat (6) is located on the outer arc surface of the lower housing (4). The acquisition circuit board is located on the inner side of the lower housing (4). A detector is provided on the acquisition circuit board, and the detector is located at the notch of the annular magnetic core. The current carrier is a U-shaped structure, including a current carrier arm (2) and a bottom arm. The annular magnetic core is sleeved on the bottom arm. The current carrier arm (2) is provided with a housing slot (8), such as... Figure 4 As shown, the housing slot (8) is used to fix the current transformer. A current carrier terminal (1) is provided at the top of the current carrier arm (2), and a terminal slot (9) is provided on the current carrier terminal (1). The terminal slot (9) is used to fix and position the current carrier terminal (1). A current carrier shielding sleeve is provided on the outside of the current carrier to shield the detector from electromagnetic interference caused by the large current signal generated by the current carrier, which greatly improves the current sampling accuracy.

[0029] The edge of the upper shell (3) has a structure with outwardly protruding ribs (12), such as Figure 8 and Figure 9 As shown, the lower housing (4) has an edge with an inner protruding rib (13), and the outer protruding rib (12) and the inner protruding rib (13) are locked together, so that the upper housing (3) and the lower housing (4) are fastened together. A flow carrier positioning post (10) is provided on the side of the lower housing (4), and the flow carrier positioning post (10) is provided at a corresponding position on the side of the upper housing (3), as shown... Figure 6 As shown, when the upper shell (3) and the lower shell (4) are fastened together, the flow carrier is locked between the flow carrier positioning posts (10).

[0030] The angle difference compensation module is equipped with an angle difference compensation circuit, see [link / reference] Figure 10 As shown, the current transformer is equipped with a phase angle compensation circuit. The output terminal of the current transformer is connected to the input terminal of the phase angle compensation circuit via a signal line. The input terminal passes through an operational amplifier and the phase angle compensation circuit, and is then filtered by a capacitor before being output. The phase angle compensation circuit connects two reverse reference diodes and is connected to the output terminal of the operational amplifier through a loop consisting of a compensation resistor and a filter capacitor.

[0031] A temperature sensor is embedded in the current carrier hole (11), and the temperature sensor is connected to the current acquisition circuit board via a signal line.

[0032] The temperature sensor is a thermistor or a platinum resistance thermometer.

[0033] This invention has the following characteristics:

[0034] 1) The present invention has a novel structure. The semi-circular upper shell (3) and lower shell (4) structure greatly improve the electromagnetic shielding effect, enabling the high current circuit to achieve accurate measurement in a shielded environment.

[0035] 2) The present invention exchanges information with external devices through interface pins (5), which greatly improves the data transmission efficiency; 3) The present invention embeds a temperature sensor in the current carrier hole (11), the temperature sensor is connected to the current acquisition circuit board through a signal line, the thermistor is in close contact with the current carrier, and when the temperature is abnormal, the control mechanism of the current acquisition circuit board will take action to ensure the safe operation of the current transformer.

[0036] 4) The angle difference compensation circuit of the present invention connects two reverse reference diodes and is connected to the output terminal of the operational amplifier through a circuit composed of a compensation resistor and a filter capacitor. After being filtered by the capacitor, the output is output, which greatly avoids the occurrence of inaccurate measurement due to current disturbance and improves the measurement accuracy of the current transformer.

Claims

1. A high-current-plate current transformer with phase angle compensation, comprising a housing, characterized in that: A current-carrying frame is provided inside the housing, and a ring-shaped magnetic core is fitted on the current-carrying frame. The ring-shaped magnetic core has a notch, and a coil is wrapped around the ring-shaped magnetic core. The current-carrying frame passes through the ring-shaped magnetic core and is connected to an external current source. A current acquisition circuit board and a pin holder (6) are provided inside the housing. An interface pin (5) is provided on the pin holder. One end of the interface pin (5) is connected to the output interface of the current acquisition circuit board through an angle difference compensation module, and the other end is connected to the interface of an external test device. The housing includes an upper housing (3) and a lower housing (4). The upper housing (3) and the lower housing (4) are semi-circular housings. The needle seat (6) is disposed on the outer arc surface of the lower housing (4). The acquisition circuit board is disposed on the inner side of the lower housing (4). A detector is provided on the acquisition circuit board. The detector is disposed at the notch of the annular magnetic core. The current carrier is a U-shaped structure, including a current carrier arm (2) and a bottom arm. The annular magnetic core is sleeved on the bottom arm. The current carrier arm (2) is provided with a housing slot (8). The top of the current carrier arm (2) is provided with a current carrier terminal (1). The current carrier terminal (1) is provided with a terminal slot (9). The upper shell (3) has an outer protruding edge (12) on its edge, and the lower shell (4) has an inner protruding edge (13) on its edge. The outer protruding edge (12) and the inner protruding edge (13) are locked together.

2. The high-current-plate current transformer with phase difference compensation according to claim 1, characterized in that: The current carrier rack is provided with a current carrier rack shielding sleeve on its exterior.

3. The high-current-plate current transformer with phase difference compensation according to claim 1, characterized in that: in The lower housing (4) is provided with a flow carrier positioning post (10) on its side, and the flow carrier positioning post (10) is provided at the corresponding position on the side of the upper housing (3).

4. The high-current-plate current transformer with phase difference compensation according to claim 2, characterized in that: The angle difference compensation module is equipped with an angle difference compensation circuit. The output terminal of the current transformer is connected to the input terminal of the angle difference compensation circuit through a signal line. The input terminal passes through an operational amplifier and the angle difference compensation circuit, and is then filtered by a capacitor before being output.

5. The high-current-plate current transformer with phase difference compensation according to claim 4, characterized in that: The angle difference compensation circuit connects two reverse reference diodes and is connected to the output terminal of the operational amplifier through a circuit consisting of a compensation resistor and a filter capacitor.

6. The high-current-plate current transformer with phase difference compensation according to claim 2, characterized in that: A temperature sensor is embedded in the hole of the current carrier, and the temperature sensor is connected to the current acquisition circuit board via a signal line.

7. The high-current-plate current transformer with phase difference compensation according to claim 6, characterized in that: The temperature sensor is a thermistor.

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