Single-live-wire electricity taking circuit

Abstract

The utility model provides a single live wire electricity taking circuit, comprising a first MOS tube, a second MOS tube and an operational amplifier, the source electrode of the first MOS tube and the source electrode of the second MOS tube are both grounded, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are both electrically connected with one end of an acceleration module, the other end of the acceleration module is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is electrically connected with the power supply. An in-phase input end of the operational amplifier is electrically connected with a positive electrode of the first voltage stabilizing diode, an inverted input end of the operational amplifier is electrically connected with the reference module, a drain electrode of the first MOS tube is electrically connected with a live wire line, a drain electrode of the second MOS tube is electrically connected with a load line, and the drain electrode of the second MOS tube is further electrically connected with a positive electrode of the first diode; the negative electrode of the first voltage stabilizing diode is electrically connected with the input end of the rectification module, and the output end of the rectification module is electrically connected with the working voltage end. The intelligent switch is simple in circuit, and can effectively avoid the situation of insufficient power supply of the connected intelligent switch.

Description

Technical Field

[0001] The utility model relates to the field of electricity, in particular to a power-taking circuit, in particular to a single-live-wire power-taking circuit. Background Art

[0002] With the development of Internet of Things technology, smart switches are becoming more and more popular. Many smart switches (especially those connected to central control panels) need to be connected to the zero and live wires to work. However, the traditional wall bottom box only has one live wire and one or more load wires to the lamps, but no neutral wire. There are currently two solutions. One way is to add a neutral wire, which requires the wall chiseling master, electrician, and decoration master to re-construct. This method of adding a neutral wire will affect the appearance if it is installed openly, and it will require redecoration if it is installed concealed, which is costly and time-consuming. Another way is to use a power-taking module to extract enough electricity from a single live wire for the zero-fire switch. Specifically, the time-sharing power-taking method is adopted, and the leading edge of the city power is taken out as the neutral wire to power the smart switch, and the trailing edge is taken out as the live wire to power the load lamps, such as "the patent document with application number 2022210252738". However, the circuit is complex and the cost is high. When the power consumption of the smart switch is relatively large, it is necessary to take out a large angle of the mains power from the front edge of the mains as the neutral line to power the smart switch. This may cause some problems, such as the energy provided may be insufficient to power the smart switch due to the angle limit; due to the load limit, when the power-taking angle is greater than a certain value, the load may not work properly (such as flickering); the product cost is expensive, etc. Therefore, it is necessary to provide a new power-taking circuit. Summary of the invention

[0003] The utility model aims to provide a single-live-wire power supply circuit, which is used to solve the problem in the prior art that the installation of an intelligent switch in a single-live-wire circuit easily leads to circuit abnormality.

[0004] The utility model provides a single live wire power taking circuit, the single live wire power taking circuit comprises a first MOS tube, a second MOS tube and an operational amplifier; wherein the source of the first MOS tube and the source of the second MOS tube are both grounded, the gate of the first MOS tube and the gate of the second MOS tube are both electrically connected to one end of an acceleration module, the other end of the acceleration module is electrically connected to the output end of the operational amplifier, the in-phase input end of the operational amplifier is electrically connected to the positive electrode of a first voltage stabilizing diode, the inverting input end of the operational amplifier is electrically connected to a reference module, the drain of the first MOS tube is electrically connected to a live wire circuit, the drain of the second MOS tube is electrically connected to a load circuit, and the drain of the second MOS tube is also electrically connected to the positive electrode of the first diode, the negative electrode of the first diode is electrically connected to the negative electrode of the second diode, the positive electrode of the second diode is electrically connected to the live wire circuit, the negative electrode of the first diode and the negative electrode of the second diode are both electrically connected to the negative electrode of the first voltage stabilizing diode, and the negative electrode of the first voltage stabilizing diode is electrically connected to the input end of a rectifier module, and the output end of the rectifier module is electrically connected to a working voltage end.

[0005] In one embodiment of the utility model, the acceleration module includes a first resistor and a first capacitor, one end of the first resistor and one end of the first capacitor are both electrically connected to the gate of the first MOS tube, and the other end of the first resistor and the other end of the first capacitor are both electrically connected to the output end of the operational amplifier.

[0006] In this implementation manner, the acceleration module composed of the first resistor and the first capacitor ensures that the first MOS transistor and the second MOS transistor can be turned on quickly.

[0007] In an implementation manner of the present utility model, the gate of the first MOS tube is also electrically connected to one end of a second resistor, and the other end of the second resistor is grounded.

[0008] In this implementation manner, the added second resistor connected to the ground ensures that the first MOS transistor and the second MOS transistor can be reliably turned off.

[0009] In one embodiment of the utility model, the rectifier module includes a third diode, a second capacitor, a third capacitor and a fourth capacitor, the positive electrode of the third diode, one end of the second capacitor and one end of the third capacitor are all electrically connected to the negative electrode of the first voltage regulator diode, the negative electrode of the third diode and one end of the fourth capacitor are all electrically connected to the working voltage end, and the other end of the second capacitor, the other end of the third capacitor and the other end of the fourth capacitor are all grounded.

[0010] In one embodiment of the utility model, the reference module includes a light emitting diode and a third resistor, the positive electrode of the light emitting diode and one end of the third resistor are electrically connected to the inverting input terminal of the operational amplifier, the negative electrode of the light emitting diode is grounded, and the other end of the third resistor is electrically connected to the negative electrode of the third diode.

[0011] In one implementation of the utility model, the in-phase input terminal of the operational amplifier is also electrically connected to one end of a fourth resistor and one end of a fifth capacitor respectively, and the other end of the fourth resistor and the other end of the fifth capacitor are both grounded.

[0012] In this implementation, the fifth capacitor is used to facilitate fine-tuning of the circuit operating frequency.

[0013] In one embodiment of the utility model, the positive power supply terminal of the operational amplifier is also electrically connected to one end of the fifth resistor, one end of the sixth capacitor and the negative electrode of the second voltage-stabilizing diode, the other end of the fifth resistor is electrically connected to the working voltage terminal, and the other end of the sixth capacitor and the positive electrode of the second voltage-stabilizing diode are both grounded.

[0014] As described above, the single live wire power supply circuit of the utility model has the following beneficial effects:

[0015] The power taking circuit of the utility model detects the voltage supplied to the intelligent switch in real time through an operational amplifier to dynamically adjust the power taking circuit. When the voltage supplied to the intelligent switch is higher than a preset voltage, the power taking circuit is turned on, and electric energy is supplied to the load on the load line; when the voltage supplied to the intelligent switch is lower than the preset voltage, the power taking circuit is disconnected, and electric energy is supplied to the switch. The whole circuit is simple, low in cost, and reliable in operation, thus avoiding the situation of insufficient power supply to the connected intelligent switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a circuit diagram of a single live wire power supply circuit according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0017] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0018] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0019] See also Figure 1 The following embodiments of the utility model provide a single-live-wire power-taking circuit, which dynamically adjusts the power-taking circuit by real-time detection of the voltage supplied to the intelligent switch through an operational amplifier. When the voltage supplied to the intelligent switch is higher than a preset voltage, the power-taking circuit is turned on, and electric energy is supplied to the load on the load line; when the voltage supplied to the intelligent switch is lower than the preset voltage, the power-taking circuit is disconnected, and electric energy is supplied to the switch. The entire circuit is simple, low-cost, and reliable in operation, avoiding the situation of insufficient power supply to the connected intelligent switch.

[0020] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] like Figure 1 As shown, in one embodiment, the utility model provides a single live wire power supply circuit, and the single live wire power supply circuit includes a first MOS tube 1, a second MOS tube 2 and an operational amplifier 3.

[0022] Specifically, the source of the first MOS tube 1 and the source of the second MOS tube 2 are both grounded, the gate of the first MOS tube 1 and the gate of the second MOS tube 2 are both electrically connected to one end of an acceleration module 4, the other end of the acceleration module 4 is electrically connected to the output end of the operational amplifier 3, the non-inverting input end of the operational amplifier 3 is electrically connected to the positive electrode of a first voltage regulator diode 5, the inverting input end of the operational amplifier 3 is electrically connected to a reference module 6, the drain of the first MOS tube 1 is electrically connected to the live line LINE, the drain of the second MOS tube 2 is electrically connected to the load line LOAD, and the drain of the second MOS tube 2 is also electrically connected to the positive electrode of a first diode 7, the cathode of the first diode 7 is electrically connected to the cathode of a second diode 8, the anode of the second diode 8 is electrically connected to the live line, the cathode of the first diode 7 and the cathode of the second diode 8 are both electrically connected to the cathode of the first voltage regulator diode 5, and the cathode of the first voltage regulator diode 5 is electrically connected to the input end of a rectifier module 9, and the output end of the rectifier module 9 is electrically connected to the working voltage end D.

[0023] In this embodiment, a pair of first MOS tube 1 and second MOS tube 2 connected in reverse series are connected between the live line LINE and the load line LOAD for turning on and off the power-taking circuit. The gate of the first MOS tube 1 and the gate of the second MOS tube 2 are connected to the output end of the operational amplifier 3. The in-phase input end of the operational amplifier 3 is provided with 48V voltage stabilization by the first voltage stabilizing diode 5, and the in-phase input end of the operational amplifier 3 is used as a comparison reference by the voltage drop of the reference module 6. At the same time, the first diode 7 and the second diode 8 are respectively connected between the live line LINE and the load line LOAD for rectification, and the rectified voltage is divided into two paths, one path is input to the in-phase input end of the operational amplifier 3 after passing through the first voltage stabilizing diode 5 for comparison, and the other path is output to the power supply end of the operational amplifier 3 after being rectified by the rectifier module 9 for power supply. During specific operation, the voltage input to the in-phase input terminal of the operational amplifier 3 through the first voltage stabilizing diode 5 is compared with the reference voltage of the reverse input terminal. When the voltage supplied to the intelligent switch is higher than the preset voltage of the working voltage terminal D, the output terminal of the operational amplifier 3 outputs a high level, the first MOS tube 1 and the second MOS tube 2 connected in reverse series are turned on, and the electric energy enters through the live line LINE, and is transmitted to the load on the load line LOAD after passing through the first MOS tube 1 and the second MOS tube 2 in sequence; and when the voltage supplied to the intelligent switch is lower than the preset voltage of the working voltage terminal D, the output terminal of the operational amplifier 3 outputs a low level, the first MOS tube 1 and the second MOS tube 2 connected in reverse series are disconnected, and the electric energy is supplied to the intelligent switch. Thus, the voltage supplied to the intelligent switch is monitored in real time to dynamically adjust the power supply circuit, ensuring power supply reorganization and avoiding the situation of insufficient power supply to the intelligent switch.

[0024] In one embodiment, the first voltage stabilizing diode 5 provides 48V voltage stabilization, and the reference module 6 provides 3V voltage drop as a reference. For example, in order to ensure compatibility, the preset voltage of the working voltage terminal D is 50V, which is recorded as the working voltage terminal D50V. When the voltage supplied to the intelligent switch is higher than 50V, the operational amplifier 3 outputs a high level, the first MOS tube 1 and the second MOS tube 2 connected in reverse series are turned on, and the electric energy enters through the live line LINE, and is transmitted to the load on the load line LOAD after passing through the first MOS tube 1 and the second MOS tube 2 in sequence; when the voltage supplied to the switch is lower than 50V (48V+2V), the operational amplifier 3 outputs a low level, the first MOS tube 1 and the second MOS tube 2 connected in reverse series are disconnected, and the electric energy is supplied to the intelligent switch.

[0025] In one embodiment, the acceleration module 4 includes a first resistor 41 and a first capacitor 42, one end of the first resistor 41 and one end of the first capacitor 42 are both electrically connected to the gate of the first MOS tube 1, and the other end of the first resistor 41 and the other end of the first capacitor 42 are both electrically connected to the output end of the operational amplifier 3. The acceleration module 4 composed of the first resistor 41 and the first capacitor 42 ensures that the first MOS tube 1 and the second MOS tube 2 can be turned on quickly.

[0026] In one embodiment, the gate of the first MOS transistor 1 is also electrically connected to one end of the second resistor 43, and the other end of the second resistor 43 is grounded GND. The second resistor 43 serves as a grounding resistor to ensure that the first MOS transistor and the second MOS transistor 2 can be reliably turned off, thereby improving the stability of the entire circuit.

[0027] In one embodiment, the rectifier module 9 includes a third diode 91, a second capacitor 92, a third capacitor 93 and a fourth capacitor 94. The positive electrode of the third diode 91, one end of the second capacitor 92 and one end of the third capacitor 93 are all electrically connected to the negative electrode of the first voltage stabilizing diode 5. The negative electrode of the third diode 91 and one end of the fourth capacitor 94 are all electrically connected to the working voltage terminal D. The other end of the second capacitor 92, the other end of the third capacitor 93 and the other end of the fourth capacitor 94 are all grounded. The second capacitor 92, the third capacitor 93 and the first diode 7 and the second diode 8 form a rectifier filter circuit to smooth the electric energy output by the first diode 7 and the second diode 8.

[0028] In one embodiment, the reference module 6 includes a light emitting diode 61 and a third resistor 62, the positive electrode of the light emitting diode 61 and one end of the third resistor 62 are both electrically connected to the inverting input terminal of the operational amplifier 3, the negative electrode of the light emitting diode 62 is grounded GND, and the other end of the third resistor 62 is electrically connected to the negative electrode of the third diode 91. Exemplarily, the light emitting diode 62 is a blue light LED lamp, and the light emitting diode 61 is provided with a power supply current by the third resistor 62, so as to ensure that the voltage drop of the light emitting diode 61 is used as the comparison reference of the operational amplifier 3.

[0029] In one embodiment, the non-inverting input terminal of the operational amplifier 3 is also electrically connected to one end of the fourth resistor 31 and one end of the fifth capacitor 32, and the other end of the fourth resistor 31 and the other end of the fifth capacitor 32 are both grounded GND. The bias current is provided to the first voltage regulator diode 5 through the fourth resistor 31, so that the first voltage regulator diode 5 works stably.

[0030] Furthermore, the forward power supply terminal of the operational amplifier 3 is also electrically connected to one end of the fifth resistor 33, one end of the sixth capacitor 34 and the negative electrode of the second Zener diode 35, the other end of the fifth resistor 33 is electrically connected to the working voltage terminal D, and the other end of the sixth capacitor 34 and the positive electrode of the second Zener diode 35 are both grounded.

[0031] The power taking circuit of the utility model detects the voltage supplied to the intelligent switch in real time through an operational amplifier to dynamically adjust the power taking circuit. When the voltage supplied to the intelligent switch is higher than a preset voltage, the power taking circuit is turned on, and electric energy is supplied to the load on the load line; when the voltage supplied to the intelligent switch is lower than the preset voltage, the power taking circuit is disconnected, and electric energy is supplied to the switch. The whole circuit is simple, low in cost, and reliable in operation, thus avoiding the situation of insufficient power supply to the connected intelligent switch.

[0032] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A single live wire power supply circuit, It is characterized in that The single live wire power supply circuit comprises a first MOS tube, a second MOS tube and an operational amplifier; wherein, The source of the first MOS tube and the source of the second MOS tube are both grounded, the gate of the first MOS tube and the gate of the second MOS tube are both electrically connected to one end of the acceleration module, the other end of the acceleration module is electrically connected to the output end of the operational amplifier, the non-inverting input end of the operational amplifier is electrically connected to the positive electrode of the first voltage regulator diode, the inverting input end of the operational amplifier is electrically connected to the reference module, the drain of the first MOS tube is electrically connected to the live line, the drain of the second MOS tube is electrically connected to the load line, and the drain of the second MOS tube is also electrically connected to the positive electrode of the first diode, the cathode of the first diode is electrically connected to the cathode of the second diode, the anode of the second diode is electrically connected to the live line, the cathode of the first diode and the cathode of the second diode are both electrically connected to the cathode of the first voltage regulator diode, and the cathode of the first voltage regulator diode is electrically connected to the input end of the rectifier module, and the output end of the rectifier module is electrically connected to the working voltage end.

2. The single live wire power supply circuit according to claim 1, It is characterized in that The acceleration module includes a first resistor and a first capacitor, one end of the first resistor and one end of the first capacitor are both electrically connected to the gate of the first MOS tube, and the other end of the first resistor and the other end of the first capacitor are both electrically connected to the output end of the operational amplifier.

3. The single live wire power supply circuit according to claim 2, It is characterized in that The gate of the first MOS tube is also electrically connected to one end of a second resistor, and the other end of the second resistor is grounded.

4. The single live wire power supply circuit according to claim 1, It is characterized in that The rectifier module includes a third diode, a second capacitor, a third capacitor and a fourth capacitor. The positive electrode of the third diode, one end of the second capacitor and one end of the third capacitor are all electrically connected to the negative electrode of the first voltage regulator diode, the negative electrode of the third diode and one end of the fourth capacitor are all electrically connected to the working voltage end, and the other end of the second capacitor, the other end of the third capacitor and the other end of the fourth capacitor are all grounded.

5. The single live wire power supply circuit according to claim 4, It is characterized in that The reference module includes a light emitting diode and a third resistor, wherein the anode of the light emitting diode and one end of the third resistor are both electrically connected to the inverting input terminal of the operational amplifier, the cathode of the light emitting diode is grounded, and the other end of the third resistor is electrically connected to the cathode of the third diode.

6. The single live wire power supply circuit according to claim 1, It is characterized in that The non-inverting input terminal of the operational amplifier is also electrically connected to one end of a fourth resistor and one end of a fifth capacitor respectively, and the other end of the fourth resistor and the other end of the fifth capacitor are both grounded.

7. The single live wire power supply circuit according to claim 4, It is characterized in that The positive power supply terminal of the operational amplifier is also electrically connected to one end of the fifth resistor, one end of the sixth capacitor and the negative electrode of the second voltage-stabilizing diode. The other end of the fifth resistor is electrically connected to the working voltage terminal. The other end of the sixth capacitor and the positive electrode of the second voltage-stabilizing diode are both grounded.

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