Perforated current measuring device

Abstract

The utility model relates to a perforated current measuring device, which comprises an outer shell formed by buckling an upper shell and a lower shell up and down, and a first perforated column, a second perforated column and a third perforated column which are arranged side by side are arranged in the upper shell. A first coil, a second coil and a third coil respectively sleeve the first perforated column, the second perforated column and the third perforated column, and a circuit board is arranged in the lower shell; the circuit board is provided with a dial code, a first output module, a second output module and a third output module, and the circuit board is also provided with a first terminal, a second terminal, a third terminal and a fourth terminal which are respectively matched with a first external plug, a second external plug, a third external plug and a fourth external plug; one end of the circuit board is also provided with an indicating lamp and a communication interface; and an MCU processing circuit is arranged on the circuit board. According to the utility model, the current sensor, the signal acquisition circuit, the communication module, the dial-up circuit and the debugging interface circuit are installed in the housing in a centralized manner, and three-phase current detection in a loop can be measured.

Description

Technical Field

[0001] The utility model relates to the technical field of current measurement, in particular to a perforated current measurement device. Background Art

[0002] At present, most perforated current measurement devices have the following defects:

[0003] 1. Most perforated current measurement devices can only measure single-phase current and cannot measure three-phase current with a single current measurement device.

[0004] 2. The measurement range and output signal of most perforated current measurement devices are fixed, and on-site personnel cannot change the measurement range and output signal.

[0005] 3. Most perforated current measurement devices are rail-mounted, but the installation direction is inconsistent with the cable perforation. When the cable is perforated, it needs to be bent, and the installation occupies a large space. Summary of the Invention

[0006] The purpose of the utility model is to overcome the above deficiencies and provide a perforated current measurement device to solve the above problems.

[0007] The purpose of the utility model is achieved as follows:

[0008] A perforated current measurement device includes a housing composed of an upper housing and a lower housing that are snap-fitted up and down. The upper housing is provided with a first perforating column, a second perforating column, and a third perforating column arranged side by side. A first coil, a second coil, and a third coil are respectively sleeved on the first perforating column, the second perforating column, and the third perforating column. A circuit board is provided in the lower housing;

[0009] The circuit board is provided with a DIP switch, a first output module, a second output module, and a third output module. The circuit board is also provided with a first terminal, a second terminal, a third terminal, and a fourth terminal, which respectively match a first external plug, a second external plug, a third external plug, and a fourth external plug. One end of the circuit board is also provided with an indicator light and a communication interface;

[0010] The circuit board is provided with an MCU processing circuit. The MCU processing circuit is connected to a signal acquisition circuit. The signal acquisition circuit is connected to a sensor. The sensor detects a current signal. The MCU processing circuit is connected to a communication circuit. The communication circuit is connected to a measurement data transmission unit. The circuit board is also provided with a DC / DC conversion circuit, a DC / DC isolation circuit, a debugging interface circuit, and a DIP switch circuit.

[0011] Further, the DC / DC conversion circuit includes a power chip IC2. A varistor RV1 and a capacitor C25 are connected in parallel. The two ends of the capacitor C25 are respectively connected to an inductor L1 and an inductor L3. The inductor L1 is connected to the chip IC2 through a diode D4, and the inductor L3 is connected to the chip IC2. Capacitors C20, C45, and C19 are connected in parallel and then connected to the chip IC2; the varistor RV1, the capacitor C25, the inductor L1, and the inductor L3 form a protection circuit for the power input EMC. The diode D4 plays an anti-reverse connection role. The fuse PT2 is for current-limiting protection. The capacitors C20, C45, and C19 play a filtering role. The power chip IC2 realizes the conversion of the output DC16V.

[0012] Further, the DC / DC isolation circuit includes a chip IC3, a transformer T2, and a transformer T3. The chip IC3 is respectively connected to the transformer T2 and the transformer T3. The transformer T3 is connected to diodes D20 and D27. Capacitor C29, TVS diode D19, capacitor C27, and resistor R28 are connected in parallel and then connected to capacitor C39. Capacitor C39 and resistor R58 are respectively connected to the chip U1.

[0013] The transformer T3 realizes the output of a DC power supply. The diodes D20, D27, and the capacitors C29, C27 form a rectifying and filtering circuit for the DC power supply output; the resistor R28 is a dummy load for the DC power supply output; the TVS diode D19 plays a clamping role for the DC power supply output; the chip U1 realizes the conversion of the output DC5V.

[0014] The transformer T2 realizes the output of three DC20V power supplies; the diodes D28, D24, D6, D7, and the capacitors C33, C43 form a rectifying and filtering circuit for the first DC20V power supply output; the TVS diode D16 plays a clamping role for the first DC20V power supply output; the diodes D8, D25, D10, D11, and the capacitors C44, C36 form a rectifying and filtering circuit for the second DC20V power supply output; the TVS diode D17 plays a clamping role for the second DC20V power supply output; the diodes D12, D13, D14, D15, and the capacitors C37, C38 form a rectifying and filtering circuit for the third DC20V power supply output; the TVS diode D18 plays a clamping role for the third DC20V power supply output.

[0015] Further, the signal acquisition circuit includes a current transformer J5. The current transformer J5 is respectively connected to TVS diodes VD3, VD2, and VD1. The TVS diode VD3 and the diode D3 are connected in parallel. The TVS diode VD2 and the diode D2 are connected in parallel. The TVS diode VD1 and the diode D1 are connected in parallel.

[0016] The resistors R11 and R14 are the sampling resistors for the first path of current. The TVS diode VD3 and the diode D3 play a clamping role in the first path of current sampling circuit. The resistors R24, R17, the capacitor C4 and the capacitor C7 constitute the filtering circuit for the first path of current sampling signal.

[0017] The TVS diode VD2 and the diode D2 play a clamping role in the second path of current sampling circuit. The resistors R7, R16, the capacitor C3 and the capacitor C6 constitute the filtering circuit for the second path of current sampling signal. The resistors R10 and R13 are the sampling resistors for the second path of current, responsible for converting the current signal into a voltage signal.

[0018] The TVS diode VD1 and the diode D1 play a clamping role in the third path of current sampling circuit. The resistors R23, R15, the capacitor C2 and the capacitor C5 constitute the filtering circuit for the third path of current sampling signal. The resistors R9 and R12 are the sampling resistors for the third path of current, responsible for converting the current signal into a voltage signal.

[0019] Further, the DIP switch circuit includes the DIP switch SW1 and the chip U5. The DIP switch SW1, the resistors R31, R34, R37 and R38 constitute the DIP switch function circuit. The chip U5 realizes the electrostatic protection for the DIP switch circuit.

[0020] Further, the debugging interface circuit includes the socket J8, the chip U3 and the capacitor C34. The socket J8 is the external debugging interface. The chip U3 realizes the electrostatic protection for the debugging interface circuit. The capacitor C34 is the filtering capacitor for the power supply of the debugging interface circuit.

[0021] Further, the communication circuit includes the chip U2, the resistors R43, R44, R45, R47, R39, the capacitors C28, C31, the TVS diodes D22, D23, D26, the resistors R30 and R32. The chip U2 realizes the function of external communication. The resistors R43, R44, R45 and R47 are the pull-up resistors for the chip U2. The resistor R39 is the pull-down resistor for the chip U2. The capacitors C28 and C31 are the power supply filtering capacitors for the chip U2. The TVS diodes D22, D23 and D26 play a clamping role for the external input level. The resistors R30 and R32 play a current limiting role.

[0022] Furthermore, the MCU processing circuit includes a chip IC1, a capacitor C8, a capacitor C9, an interface J3, an LED1, a resistor R3 and a resistor R4. The chip IC1 is responsible for processing the input data of the sampling circuit and the dialing circuit, calibrating the data through the debugging interface circuit, and transmitting the data to the outside through the communication circuit; the capacitor C8 and the capacitor C9 are the power filter capacitors of the chip IC1; the interface J3 is the program burning port of the chip IC1; the indicator light LED1, the resistor R3 and the resistor R4 constitute the indicator light circuit.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The utility model provides a perforated current measuring device with three built-in current sensors, which can realize the function of measuring three-phase current with a single device; the utility model adopts a dial code to realize the switching of the measuring range, and it is convenient for on-site personnel to change the measuring range; the utility model adopts guide rail installation, the current perforation direction is consistent with the installation direction, the cable does not need to be bent, and the customer's installation space is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] Figure 2 This is a principle block diagram of the utility model.

[0027] Figure 3 The schematic diagram of the DC / DC conversion circuit of the utility model is shown in FIG.

[0028] Figure 4 The utility model is a circuit schematic diagram of the DC / DC isolation circuit.

[0029] Figure 5 This is a circuit schematic diagram of the sampling circuit of the utility model.

[0030] Figure 6 The utility model is a circuit principle diagram of the dial circuit.

[0031] Figure 7 This is a circuit schematic diagram of the debugging interface circuit of the utility model.

[0032] Figure 8 The utility model is a circuit schematic diagram of the communication circuit.

[0033] Figure 9 It is a circuit principle diagram of the MCP processing circuit of the utility model.

[0034] in:

[0035] Upper housing 1, first perforated column 2, second perforated column 3, third perforated column 4, DIP switch 5, circuit board 6, first coil 7, second coil 8, third coil 9, first output module 10, lower housing 11, indicator light 12, communication interface 13, first terminal 14, second terminal 15, second output module 16, third terminal 17, fourth terminal 18, third output module 19, first external plug 20, second external plug 21, third external plug 22, fourth external plug 23. Detailed implementation

[0036] To better understand the technical solution of the present invention, the following will be described in detail in conjunction with relevant drawings. It should be understood that the following specific embodiments are not intended to limit the specific implementation forms of the technical solution of the present invention, but only the implementation forms that can be adopted by the technical solution of the present invention. It should be noted first that the description of the positional relationship of each component in this article, such as component A is located above component B, is based on the relative positions of each component in the drawings and is not intended to limit the actual positional relationship of each component. Embodiment 1

[0037] See Figure 1 - Figure 2 , Figure 1 , a structural schematic diagram of the present invention is drawn. As shown in the figure, a perforated current measuring device related to the present invention includes a housing composed of an upper housing 1 and a lower housing 11 that are snap-fitted up and down. The upper housing 1 is provided with a first perforated column 2, a second perforated column 3, and a third perforated column 4 arranged side by side. A first coil 7, a second coil 8, and a third coil 9 are respectively sleeved on the first perforated column 2, the second perforated column 3, and the third perforated column 4. A circuit board 6 is provided in the lower housing 11.

[0038] The circuit board 6 is provided with a DIP switch 5, a first output module 10, a second output module 16, and a third output module 19. The circuit board 6 is also provided with a first terminal 14, a second terminal 15, a third terminal 17, and a fourth terminal 18, which are respectively matched with a first external plug 20, a second external plug 21, a third external plug 22, and a fourth external plug 23. One end of the circuit board 6 is also provided with an indicator light 12 and a communication interface 13.

[0039] The circuit board 6 is provided with an MCU processing circuit. The MCU processing circuit is connected to a signal acquisition circuit. The signal acquisition circuit is connected to a sensor. The sensor detects a current signal. The MCU processing circuit is connected to a communication circuit. The communication circuit is connected to a measurement data transmission unit. The circuit board 6 is also provided with a DC / DC conversion circuit, a DC / DC isolation circuit, a debugging interface circuit, and a DIP switch circuit.

[0040] See Figure 3 , Figure 3It is a circuit schematic diagram of a DC / DC conversion circuit. As shown in the figure, the DC / DC conversion circuit is a power supply circuit with an input of DC 20 - 35V. The DC / DC conversion circuit includes a power supply chip IC2. A varistor RV1 and a capacitor C25 are connected in parallel. The two ends of the capacitor C25 are respectively connected to an inductor L1 and an inductor L3. The inductor L1 is connected to the chip IC2 through a diode D4, the inductor L3 is connected to the chip IC2, and capacitors C20, C45, and C19 are connected in parallel and then connected to the chip IC2.

[0041] The varistor RV1, capacitor C25, inductor L1, and inductor L3 constitute the protection of the power input EMC. The diode D4 plays a role in preventing reverse connection. The fuse PT2 is for current limiting protection. Capacitors C20, C45, and C19 play a filtering role. The power supply chip IC2 realizes the conversion of the output DC16V.

[0042] See Figure 4 , Figure 4 It is a circuit schematic diagram of a DC / DC isolation circuit. As shown in the figure, the DC / DC isolation circuit includes a chip IC3, a transformer T2, and a transformer T3. The chip IC3 is respectively connected to the transformer T2 and the transformer T3. The transformer T3 is connected to diodes D20 and D27. Capacitor C29, TVS diode D19, capacitor C27, and resistor R28 are connected in parallel and then connected to capacitor C39. Capacitor C39 and resistor R58 are respectively connected to the chip U1;

[0043] The transformer T3 realizes the output of a DC power supply. Diodes D20, D27, and capacitors C29, C27 constitute a rectifying and filtering circuit for the DC power supply output; the resistor R28 is a dummy load for the DC power supply output; the TVS diode D19 plays a clamping role for the DC power supply output; the chip U1 realizes the conversion of the output DC5V.

[0044] The transformer T2 realizes the output of three DC 20V power supplies; diodes D28, D24, D6, D7, and capacitors C33, C43 constitute a rectifying and filtering circuit for the first DC 20V power supply output; the TVS diode D16 plays a clamping role for the first DC 20V power supply output; diodes D8, D25, D10, D11, and capacitors C44, C36 constitute a rectifying and filtering circuit for the second DC 20V power supply output; the TVS diode D17 plays a clamping role for the second DC 20V power supply output; diodes D12, D13, D14, D15, and capacitors C37, C38 constitute a rectifying and filtering circuit for the third DC 20V power supply output; the TVS diode D18 plays a clamping role for the third DC 20V power supply output.

[0045] See Figure 5 , Figure 5It is a circuit schematic diagram of the signal acquisition circuit. As shown in the figure, the signal acquisition circuit includes a mutual inductor J5, and the mutual inductor J5 is respectively connected to a TVS tube VD3, a TVS tube VD2, and a TVS tube VD1. The TVS tube VD3 is in parallel with a diode D3, the TVS tube VD2 is in parallel with a diode D2, and the TVS tube VD1 is in parallel with a diode D1;

[0046] The mutual inductor J5 is used to sense three-phase current and convert the large current on the primary side into a small current signal on the secondary side; the resistors R11 and R14 are the sampling resistors of the first path of current, responsible for converting the current signal into a voltage signal; the TVS tube VD3 and the diode D3 play a clamping role for the first path of current sampling circuit; the resistors R24, R17, capacitors C4 and C7 constitute a filtering circuit for the first path of current sampling signal;

[0047] The TVS tube VD2 and the diode D2 play a clamping role for the second path of current sampling circuit; the resistors R7, R16, capacitors C3 and C6 constitute a filtering circuit for the second path of current sampling signal, and the resistors R10 and R13 are the sampling resistors of the second path of current, responsible for converting the current signal into a voltage signal;

[0048] The TVS tube VD1 and the diode D1 play a clamping role for the third path of current sampling circuit; the resistors R23, R15, capacitors C2 and C5 constitute a filtering circuit for the third path of current sampling signal, and the resistors R9 and R12 are the sampling resistors of the third path of current, responsible for converting the current signal into a voltage signal.

[0049] See Figure 6 , Figure 6 It is a circuit schematic diagram of the DIP switch circuit. As shown in the figure, the DIP switch circuit includes a DIP switch SW1 and a chip U5. The DIP switch SW1, resistors R31, R34, R37 and R38 constitute a DIP switch function circuit, and the chip U5 realizes electrostatic protection for the DIP switch circuit.

[0050] See Figure 7 , Figure 7 It is a circuit schematic diagram of the debugging interface circuit. As shown in the figure, the debugging interface circuit includes a socket J8, a chip U3 and a capacitor C34. The socket J8 is an external debugging interface, the chip U3 realizes electrostatic protection for the debugging interface circuit, and the capacitor C34 is a filtering capacitor for the power supply of the debugging interface circuit.

[0051] See Figure 8 , Figure 8It is a circuit schematic diagram of a communication circuit. As shown in the figure, the communication circuit includes chip U2, which realizes the function of external communication. Resistors R43, R44, R45, and R47 are pull-up resistors for chip U2, resistor R39 is a pull-down resistor for chip U2, capacitors C28 and C31 are power filter capacitors for chip U2, TVS diodes D22, D23, and D26 play a role in clamping the external input level, and resistors R30 and R32 play a role in current limiting.

[0052] See Figure 9 , Figure 9 It is a circuit schematic diagram of an MCU processing circuit. As shown in the figure, the MCU processing circuit includes chip IC1, which is responsible for processing the input data of the sampling circuit and the DIP switch circuit, calibrating the data through the debugging interface circuit, and realizing the external transmission of the data through the communication circuit; capacitors C8 and C9 are power filter capacitors for chip IC1; interface J3 is the program burning port for chip IC1; indicator LED1, resistor R3, and resistor R4 constitute an indicator circuit.

[0053] Working principle:

[0054] The present utility model provides a perforated current measurement device. Three coils are respectively installed in three perforated columns in the upper housing and fixed, three output modules are soldered on the circuit board, and then the circuit board is installed in the lower housing; then the upper housing and the lower housing are assembled together by buckles, and finally an external plug is inserted into the terminal. The debugging of the current measurement device can be completed through the communication interface on the circuit board. The indicator on the circuit board can indicate the state of the current measurement device. The DIP switch on the circuit board can realize the switching of different current ranges.

[0055] The present utility model centrally installs a current sensor, a signal acquisition circuit, a communication module, a DIP switch circuit, and a debugging interface circuit within one housing, and can measure the three-phase current in the loop. Three current sensors are built in, which can realize the function of measuring three-phase current with a single device; the range is switched by using a DIP switch, which is convenient for on-site personnel to change the range; it is installed by using a rail, and the current perforation direction is consistent with the installation direction, and the cable does not need to be bent, saving the customer installation space.

[0056] The above are only specific application examples of the present utility model, which do not constitute any limitation to the protection scope of the present utility model. Any technical solutions formed by equivalent transformation or equivalent replacement fall within the scope of the protection of the present utility model.

Claims

1. A perforated current measurement device, characterized in that: It includes a housing composed of an upper housing (1) and a lower housing (11) buckled up and down. Inside the upper housing (1), there are first perforated columns (2), second perforated columns (3) and third perforated columns (4) arranged side by side. First coils (7), second coils (8) and third coils (9) are respectively sleeved on the first perforated columns (2), second perforated columns (3) and third perforated columns (4). Inside the lower housing (11), there is a circuit board (6). On the circuit board (6), there are DIP switches (5), a first output module (10), a second output module (16) and a third output module (19). On the circuit board (6), there are also a first terminal (14), a second terminal (15), a third terminal (17) and a fourth terminal (18), which are respectively matched with a first external plug (20), a second external plug (21), a third external plug (22) and a fourth external plug (23). One end of the circuit board (6) is also provided with an indicator light (12) and a communication interface (13). On the circuit board (6), there is an MCU processing circuit. The MCU processing circuit is connected to a signal acquisition circuit, the signal acquisition circuit is connected to a sensor, the sensor detects current signals, the MCU processing circuit is connected to a communication circuit, and the communication circuit is connected to a measurement data transmission unit. On the circuit board (6), there are also a DC / DC conversion circuit, a DC / DC isolation circuit, a debugging interface circuit and a DIP switch circuit.

2. The perforated current measuring device according to claim 1, characterized in that: The DC / DC conversion circuit includes a power chip IC2. A varistor RV1 and a capacitor C25 are connected in parallel. Two ends of the capacitor C25 are respectively connected to an inductor L1 and an inductor L3. The inductor L1 is connected to the chip IC2 through a diode D4, the inductor L3 is connected to the chip IC2, and capacitors C20, C45 and C19 are connected in parallel and then connected to the chip IC2. The varistor RV1, the capacitor C25, the inductor L1 and the inductor L3 constitute a protection circuit for power input EMC. The diode D4 plays an anti-reverse connection role. The fuse PT2 is for current limiting protection. The capacitors C20, C45, C19 play a filtering role. The power chip IC2 realizes the conversion of outputting DC16V.

3. The perforated current measuring device according to claim 1, characterized in that: The DC / DC isolation circuit includes a chip IC3, a transformer T2 and a transformer T3. The chip IC3 is respectively connected to the transformer T2 and the transformer T3. The transformer T3 is connected to a diode D20 and a diode D27. Capacitors C29, a TVS tube D19, a capacitor C27 and a resistor R28 are connected in parallel and then connected to a capacitor C39. The capacitor C39 and a resistor R58 are respectively connected to a chip U1. The transformer T3 realizes the output of a DC power supply. The diodes D20, D27 and the capacitors C29, C27 constitute a rectifying and filtering circuit for the DC power supply output. The resistor R28 is a dummy load for the DC power supply output. The TVS tube D19 plays a clamping role for the DC power supply output. The chip U1 realizes the conversion of outputting DC5V. Transformer T2 realizes the output of three-way DC20V power supply; Diode D28, diode D24, diode D6, diode D7 and capacitor C33, capacitor C43 constitute the rectifying and filtering circuit for the first-way DC20V power supply output; TVS tube D16 plays a clamping role for the first-way DC20V power supply output; Diode D8, diode D25, diode D10, diode D11 and capacitor C44, capacitor C36 constitute the rectifying and filtering circuit for the second-way DC20V power supply output; TVS tube D17 plays a clamping role for the second-way DC20V power supply output; Diode D12, diode D13, diode D14, diode D15 and capacitor C37, capacitor C38 constitute the rectifying and filtering circuit for the third-way DC20V power supply output; TVS tube D18 plays a clamping role for the third-way DC20V power supply output.

4. A perforated current measuring device according to claim 1, characterized in that: The signal acquisition circuit includes current transformer J5, and current transformer J5 is respectively connected to TVS tube VD3, TVS tube VD2 and TVS tube VD1. TVS tube VD3 is in parallel with diode D3, TVS tube VD2 is in parallel with diode D2, and TVS tube VD1 is in parallel with diode D1; Resistors R11 and R14 are the sampling resistors for the first-way current. TVS tube VD3 and diode D3 play a clamping role for the first-way current sampling circuit; Resistors R24, R17, capacitor C4 and capacitor C7 constitute the filtering circuit for the first-way current sampling signal; TVS tube VD2 and diode D2 play a clamping role for the second-way current sampling circuit; Resistors R7, R16, capacitor C3 and capacitor C6 constitute the filtering circuit for the second-way current sampling signal. Resistors R10 and R13 are the sampling resistors for the second-way current, responsible for converting the current signal into a voltage signal; TVS tube VD1 and diode D1 play a clamping role for the third-way current sampling circuit; Resistors R23, R15, capacitor C2 and capacitor C5 constitute the filtering circuit for the third-way current sampling signal. Resistors R9 and R12 are the sampling resistors for the third-way current, responsible for converting the current signal into a voltage signal.

5. The perforated current measuring device according to claim 1, wherein: The DIP switch circuit includes DIP switch SW1 and chip U5. DIP switch SW1, resistors R31, R34, R37 and R38 constitute the DIP switch function circuit, and chip U5 realizes the electrostatic protection for the DIP switch circuit.

6. The perforated current measuring device according to claim 1, wherein: The debugging interface circuit includes socket J8, chip U3 and capacitor C34. Socket J8 is the external debugging interface. Chip U3 realizes the electrostatic protection for the debugging interface circuit, and capacitor C34 is the filtering capacitor for the power supply of the debugging interface circuit.

7. The perforated current measuring device according to claim 1, characterized in that: The communication circuit includes chip U2, resistor R43, resistor R44, resistor R45, resistor R47, resistor R39, capacitor C28, capacitor C31, TVS diodes D22, D23, D26, resistor R30, and resistor R32. Chip U2 realizes the function of external communication. Resistors R43, R44, R45, and R47 are pull-up resistors for chip U2. Resistor R39 is a pull-down resistor for chip U2. Capacitors C28 and C31 are power filter capacitors for chip U2. TVS diodes D22, D23, and D26 play a role in clamping the external input level. Resistors R30 and R32 play a role in current limiting.

8. The perforated current measuring device according to claim 1, wherein: The MCU processing circuit includes chip IC1, capacitor C8, capacitor C9, interface J3, LED1, resistor R3, and resistor R4. Chip IC1 is responsible for processing the input data of the sampling circuit and the DIP switch circuit, calibrating the data through the debugging interface circuit, and realizing the external transmission of the data through the communication circuit. Capacitors C8 and C9 are power filter capacitors for chip IC1. Interface J3 is the program burning port for chip IC1. The indicator light LED1, resistor R3, and resistor R4 constitute the indicator light circuit.

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