Electricity taking and collecting integrated mutual inductor circuit

Abstract

The utility model relates to the technical field of mutual inductors, in particular to an electricity taking and collecting integrated mutual inductor circuit. The electricity taking and collecting integrated mutual inductor circuit comprises an iron core, a coil L1 is wound around the iron core, a transient suppression diode D1 is connected to the two ends of the coil L1 in parallel, a first node and a second node are formed at the two ends of the transient suppression diode D1, the second node is connected with a ground wire, the first node is connected with a rectifying and filtering module, and the second node is connected with a signal collecting module. The system also comprises an electricity-taking acquisition switch, the electricity-taking acquisition switch comprises an optical isolator U2, the collector electrode of the optical isolator U2 is connected with the first node, the emitter electrode of the optical isolator U2 is connected with the second node, the positive electrode of the optical isolator U2 is connected with an MCU, and the negative electrode of the optical isolator U2 is grounded. According to the utility model, the mutual inductor can take electricity while collecting electricity utilization data, so that the utilization rate of the mutual inductor is better improved.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, and more specifically, to a current transformer circuit that integrates power acquisition and data collection. Background Technology

[0002] As an important power measurement device, current transformers are widely used in various industrial fields. They can convert large current signals into measurable low current signals, making it convenient for users to read them.

[0003] Traditional instrument transformers mainly have signal acquisition functions. They can accurately sense and transmit power signals, but the induced current generated at the instrument transformer is often not fully utilized, resulting in energy waste. Utility Model Content

[0004] This invention provides an integrated current transformer circuit for power acquisition and collection, which can overcome some or all the defects of the prior art.

[0005] According to the present invention, the integrated current transformer circuit for power acquisition includes an iron core, a coil L1 wound around the iron core, a transient suppression diode D1 connected in parallel across the two ends of the coil L1, a first node and a second node formed across the two ends of the transient suppression diode D1, the second node being connected to ground, a rectifier and filter module connected to the first node, a signal acquisition module connected to the second node, and a power acquisition switch including an opto-isolator U2. The collector of the opto-isolator U2 is connected to the first node, the emitter of the opto-isolator U2 is connected to the second node, the positive terminal of the opto-isolator U2 is connected to an MCU, and the negative terminal of the opto-isolator U2 is grounded.

[0006] Preferably, the signal acquisition module includes an operational amplifier U3 and a reference voltage source U4. The non-inverting input of the operational amplifier U3 is connected to the emitter of the opto-isolator U2. A resistor R5 is connected between the non-inverting input of the operational amplifier U3 and the emitter of the opto-isolator U2. The inverting input of the comparator U3 is connected to the output pin of the reference voltage source U4. The output of the operational amplifier U3 is connected to the MCU.

[0007] Preferably, the power supply terminal of operational amplifier U3 is connected to the power supply terminal of the MCU, a capacitor C1 is connected between the power supply terminal of operational amplifier U3 and the ground wire, and the ground pin of operational amplifier U3 is connected to the ground wire.

[0008] Preferably, the output of operational amplifier U3 is connected to the MCU by resistors R8 and R9 in sequence, forming a third node between resistors R8 and R9, and a capacitor C3 is provided between the third node and the ground wire. A fourth node is formed between resistor R9 and the MCU, and a capacitor C4 is provided between the fourth node and the ground wire.

[0009] Preferably, a resistor R6 is connected between the inverting input terminal and the output terminal of the operational amplifier U3, and a capacitor C2 is connected in parallel across the resistor R6.

[0010] Preferably, a resistor R7 is connected between the inverting input of the comparator and the ground line, and the output pins of the reference voltage source U4 are connected to the two ends of the resistor R7 respectively to form a first branch and a second branch. A resistor R10 is connected to the first branch and a capacitor C6 is connected to the second branch.

[0011] Preferably, the input pin of the reference voltage source U4 is connected to the MCU power supply terminal, the ground pin of the reference voltage source U4 is connected to the ground wire, and a capacitor C5 is connected between the input pin and the ground pin of the reference voltage source U4.

[0012] Preferably, the rectifier filter module includes a diode D4 connected to the first node, and a capacitor C10 is connected in parallel across the diode D4.

[0013] Preferably, the rectifier filter module also includes two diodes D3 connected in the same direction, forming a fifth node between the two diodes D3. The fifth node is connected to capacitor C10. One end of each of the two diodes is grounded, and the other end forms a power supply terminal. A diode D6 is provided at the power supply terminal. A capacitor C9, a capacitor C11, and a Zener diode D5 are connected between the grounded end of the two diodes and diode D6. The capacitors C9, C11, and Zener diode D5 are connected in parallel with each other.

[0014] Preferably, a resistor R2 is connected between the second node and the emitter of the optical isolator U2.

[0015] Beneficial effects:

[0016] This invention uses the same set of coils L1, which enables the current transformer to draw power while collecting power consumption data, thereby improving the utilization rate of the current transformer.

[0017] Furthermore, the filtering and rectifier module can provide a more stable voltage for the downstream load circuit of the transformer. Attached Figure Description

[0018] Figure 1 Circuit diagram of an integrated current transformer for power acquisition and data collection. Detailed Implementation

[0019] To further understand the content of this utility model, a detailed description of the utility model is provided in conjunction with the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the utility model.

[0020] Seen in Figure 1This embodiment provides a power acquisition integrated transformer circuit, including an iron core with a coil L1 wound around it. A transient suppression diode D1 is connected in parallel across the two ends of the coil L1. The two ends of the transient suppression diode D1 form a first node 1 and a second node 2. The second node 2 is connected to the ground wire. A rectifier and filter module is connected to the first node 1, and a signal acquisition module is connected to the second node 2. The circuit also includes a power acquisition switch, which includes an optical isolator U2. The collector 3 port of the optical isolator U2 is connected to the first node 1, and the emitter of the optical isolator U2 is connected to the second node 2. The positive terminal 1 port of the optical isolator U2 is connected to an MCU, and the negative terminal 2 port of the optical isolator U2 is grounded. A resistor R2 is connected between the second node 2 and the emitter 4 port of the optical isolator U2.

[0021] According to the solution provided in this embodiment, the iron core is sleeved at the cable. The magnetic field generated when the current flows in the cable causes a change in magnetic flux in the iron core, thus generating an induced electromotive force in the coil L1.

[0022] Furthermore, a transient suppression diode D1 is connected in parallel across the two ends of the coil L1. This diode can be used to protect the circuit. When the transient voltage generated by the coil is too high, the transient suppression diode D1 will conduct, clamping the excessive voltage and thus protecting the subsequent circuit from damage.

[0023] In this embodiment, the rectifier and filter module connected to the first node 1 converts the induced AC signal into a DC signal and performs smoothing processing to provide a stable power supply for the subsequent transformer load circuit. The second node 2 is connected to the signal acquisition module, which converts the small current signal into an electrical signal and sends it to the MCU for subsequent data processing and analysis.

[0024] The power acquisition switch is used to control the switching between power acquisition and signal acquisition. By setting up the optical isolator U2, the low potential difference between the MCU and the ground wire and the high potential difference between the first node 1 and the second node 2 can be isolated, thereby protecting the MCU circuit. The voltage input by the MCU controls the conduction between the collector and emitter of the optical isolator U2. Specifically, the MCU is triggered once every 10 seconds, and each trigger lasts for about 140ms. The signal acquisition module can acquire 5-6 waveforms.

[0025] Furthermore, resistor R2 is placed between the emitter of the opto-isolator and the second node 2, which can effectively limit the current and thus protect the signal acquisition module.

[0026] In this embodiment, the signal acquisition module includes an operational amplifier U3 and a reference voltage source U4. The non-inverting input port 3 of the operational amplifier U3 is connected to the emitter of the opto-isolator U2. A resistor R5 is connected between the non-inverting input port of the operational amplifier U3 and the emitter of the opto-isolator U2. The inverting input port 4 of the operational amplifier U3 is connected to the output pin of the reference voltage source U4. The output port 1 of the operational amplifier U3 is connected to the MCU.

[0027] Operational amplifier U3 is used to amplify the input signal. Its non-inverting input terminal is connected to the emitter of opto-isolator U2 to receive the signal from the upper end of resistor R2. By setting resistor R5, the non-inverting input signal can be safely current-limited and the influence of noise can be reduced.

[0028] Furthermore, the power supply pin 5 of operational amplifier U3 is connected to the power supply pin of the MCU, ensuring a stable power supply and normal operation. It is understood that operational amplifier U3 will only operate when the signal acquisition module acquires a current signal, synchronized with the MCU trigger time. A capacitor C1 is connected between the power supply pin of operational amplifier U3 and the ground line, and the ground pin 2 of operational amplifier U3 is also connected to the ground line. Capacitor C1 performs filtering and decoupling, effectively suppressing high-frequency noise interference at the power supply pin of operational amplifier U3.

[0029] In this embodiment, resistors R8 and R9 are connected sequentially between the output of operational amplifier U3 and the MCU. Through the filtering effect of resistors R8 and capacitor C3, and R9 and capacitor C4, the signal output by the operational amplifier is smooth and interference-free, thus suitable for MCU input. A third node 3 is formed between resistors R8 and R9, and capacitor C3 is provided between the third node 3 and ground. A fourth node 4 is formed between resistor R9 and the MCU, and capacitor C4 is provided between the fourth node 4 and ground. The setting of capacitors C3 and C4 effectively filters high-frequency noise and transient interference, ensuring that the signal received by the MCU is more stable and avoiding malfunctions caused by noise.

[0030] In some embodiments, a resistor R6 is connected between the inverting input and output of operational amplifier U3, forming a feedback loop that feeds the output signal of operational amplifier U3 back to the inverting input. This feedback loop can adjust the gain of operational amplifier U3, ensuring its stable operation within a specific operating range. A capacitor C2 is connected in parallel across resistor R6. Capacitor C2 filters out high-frequency noise, ensuring the stability of the feedback loop and thus improving the overall performance of operational amplifier U3.

[0031] Furthermore, a resistor R7 is connected between the inverting input terminal of the operational amplifier U3 and the ground line, and the output pin 2 of the reference voltage source U4 is connected to both ends of the resistor R7 respectively, forming the first branch 6 and the second branch 7. A resistor R10 is connected to the first branch 6, and a capacitor C6 is connected to the second branch 7.

[0032] In this circuit, resistor R7, combined with the reference voltage source U4, forms a voltage distribution circuit, allowing the DC voltage at the inverting input to be adjusted according to the reference voltage U4. By selecting different resistor values ​​for R7, the reference voltage at the inverting input can be flexibly set. In this embodiment, the reference voltage is 1.2V. Capacitor C6 acts as a filter, smoothing the output voltage of the reference voltage source U4, suppressing high-frequency noise, and ensuring signal stability.

[0033] Furthermore, the input pin 1 of the reference voltage source U4 is connected to the power supply terminal of the MCU, the ground pin 3 of the reference voltage source U4 is connected to the ground line, and a capacitor C5 is connected between the input pin and the ground pin of the reference voltage source U4. The capacitor C5 can filter the high-frequency noise input from the voltage terminal of the MCU to the reference voltage source, thereby keeping the voltage at the reference voltage source U4 stable, so that the comparator U3 can operate stably.

[0034] In some embodiments, the rectifier-filter module includes a diode D4 connected to the first node 1. The diode D4 can convert the AC signal at the first node 1 into a DC signal, thereby achieving rectification. A capacitor C10 is connected in parallel across the diode D4. The capacitor C10 acts as a coupling capacitor, providing a certain degree of DC blocking and AC passing.

[0035] Furthermore, the rectifier and filter module also includes two diodes D3 connected in the same direction, forming a fifth node 5 between the two diodes D3. The fifth node 5 is connected to a capacitor C10. One end of each of the two diodes is grounded, and the other end forms a power supply terminal. A diode D6 is provided at the power supply terminal. A capacitor C9, a capacitor C11, and a Zener diode D5 are connected between the grounded end of the two diodes and the diode D6. The capacitors C9, C11, and Zener diode D5 are connected in parallel with each other.

[0036] Two diodes can perform full-wave rectification, thus providing a stable DC power supply for subsequent circuits. Capacitors C9 and C11 and Zener diode D5 can perform filtering and voltage regulation, thereby stabilizing the DC power supply voltage. Diode D6 ensures the directionality of the power supply, prevents current reverse flow, and reduces the impact on the load. Therefore, the power supply terminal can provide a more stable and reliable voltage.

[0037] Working principle:

[0038] When this integrated current transformer circuit is running, the current transformer is installed at the cable that needs to be monitored or collected. When current flows through the cable, an induced electromotive force is generated in coil L1. The AC power is converted into DC power by the rectifier and filter module and used by the current transformer's subsequent load circuit. At the same time, the MCU controls the current collection switch and the signal acquisition module to collect the current signal. Specifically, the MCU is triggered once every 10 seconds, and each signal acquisition time is about 140ms. The signal acquisition module can collect 5-6 waveforms for monitoring the power consumption information of the cable.

[0039] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

[0040] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited to this. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A power-tapping integrated mutual inductor circuit comprising a core, characterized in that, A coil L1 is wound around the iron core, transient suppression diodes D1 are connected in parallel across the coil L1, the transient suppression diodes D1 form a first node and a second node across the two ends, the second node is connected with a ground wire, the first node is connected with a rectification filtering module, the second node is connected with a signal acquisition module, and the signal acquisition module further comprises a power acquisition switch, the power acquisition switch comprises an optical isolator U2, the collector of the optical isolator U2 is connected with the first node, the emitter of the optical isolator U2 is connected with the second node, the positive electrode of the optical isolator U2 is connected with an MCU, and the negative electrode of the optical isolator U2 is grounded.

2. The power-taking and collecting integrated mutual inductor circuit according to claim 1, characterized in that, The signal acquisition module comprises an operational amplifier U3 and a reference voltage source U4, the non-inverting input end of the operational amplifier U3 is connected with the emitter of the optical isolator U2, a resistor R5 is connected between the non-inverting input end of the comparator U3 and the emitter of the optical isolator U2, the inverting input end of the operational amplifier U3 is connected with the output pin of the reference voltage source U4, and the output end of the operational amplifier U3 is connected with the MCU.

3. The power-taking and collecting integrated mutual inductor circuit according to claim 2, characterized in that, The power supply end of the operational amplifier U3 is connected with the power supply end of the MCU, a capacitor C1 is connected between the power supply end of the operational amplifier U3 and the ground wire, and the ground pin of the operational amplifier U3 is connected with the ground wire.

4. The power-taking and collecting integrated mutual inductor circuit according to claim 2, characterized in that, The output end of the operational amplifier U3 is connected with the resistor R8 and the resistor R9 in sequence between the MCU, a third node is formed between the resistor R8 and the resistor R9, a capacitor C3 is arranged between the third node and the ground wire, a fourth node is formed between the resistor R9 and the MCU, and a capacitor C4 is arranged between the fourth node and the ground wire.

5. The power-taking and collecting integrated mutual inductor circuit according to claim 2, characterized in that, The resistor R6 is connected between the inverting input end and the output end of the operational amplifier U3, and the capacitor C2 is connected in parallel across the resistor R6.

6. The power-taking and collecting integrated mutual inductor circuit according to claim 2, characterized in that, The resistor R7 is connected between the inverting input end of the comparator and the ground wire, the output pin of the reference voltage source U4 is connected with the two ends of the resistor R7, forming a first branch and a second branch, the resistor R10 is connected on the first branch, and the capacitor C6 is connected on the second branch.

7. The power-taking and collecting integrated mutual inductor circuit according to claim 1, characterized in that, The input pin of the reference voltage source U4 is connected with the power supply end of the MCU, the ground pin of the reference voltage source U4 is connected with the ground wire, and the capacitor C5 is connected between the input pin and the ground pin of the reference voltage source U4.

8. The power-taking and collecting integrated mutual inductor circuit according to claim 1, characterized in that, The rectification filtering module comprises a diode D4 connected with the first node, and the capacitor C10 is connected in parallel across the diode D4.

9. The power-taking and collecting integrated mutual inductor circuit according to claim 8, characterized in that, The rectification filtering module further comprises two diodes D3 connected in the same direction, a fifth node is formed between the two diodes D3, the fifth node is connected with the capacitor C10, one end of the two diodes is grounded, and the other end forms a power supply end, the power supply end is provided with a diode D6, and the capacitor C9, the capacitor C11 and the voltage stabilizing diode D5 are connected between one end of the two diodes and the diode D6.

10. The power-taking and collecting integrated mutual inductor circuit according to claim 1, characterized in that, The resistor R2 is connected between the second node and the emitter of the optical isolator U2.

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