阅读说明：本技术 一种交流串联取电电路 (Alternating current series connection electricity-taking circuit ) 是由 万飞 于 2019-10-21 设计创作，主要内容包括：本发明公开了一种交流串联取电电路,包括双向可控硅、电阻、第一稳压二极管、第二稳压二极管、整流桥、极性电容。本发明可实现在一个交流串联回路内稳定取得电能,从而在零线未接入的单火线应用场景下,为电子开关提供工作所需的能源。(The invention discloses an alternating-current series power-taking circuit which comprises a bidirectional controllable silicon, a resistor, a first voltage stabilizing diode, a second voltage stabilizing diode, a rectifier bridge and a polar capacitor. The invention can realize stable acquisition of electric energy in an alternating current series circuit, thereby providing energy required by work for the electronic switch under the application scene of a single live wire with a non-accessed zero line.)

1. An alternating current series connection electricity taking circuit is characterized by comprising a bidirectional thyristor, a resistor, a first voltage stabilizing diode, a second voltage stabilizing diode, a rectifier bridge and a polar capacitor; the first anode of the bidirectional thyristor, the first pin of the resistor and the first alternating current input pin of the rectifier bridge are connected with a live wire together; a second anode of the bidirectional controllable silicon, a cathode of the second voltage stabilizing diode and a second alternating current input pin of the rectifier bridge are connected with a first pin of a load together; the gate pole of the bidirectional controllable silicon and the second pin of the resistor are connected with the cathode of the first voltage stabilizing diode; the anode of the first voltage stabilizing diode is connected with the anode of the second voltage stabilizing diode; the positive electrode of the rectifier bridge is connected with the positive electrode of the polar capacitor; the negative electrode of the rectifier bridge and the negative electrode of the polar capacitor are connected with a reference ground together; and a second pin of the load is connected with the zero line.

2. An ac series circuit according to claim 1, wherein said first zener diode and said second zener diode are connected in reverse direction simultaneously, i.e. the cathode of said first zener diode is connected to the cathode of said second zener diode, without affecting the final effect of the whole circuit.

3. An AC series current taking circuit as claimed in claim 1, wherein said triac is adapted to switch on or off a load circuit; the resistor is used for preventing the bidirectional controllable silicon from being interfered and triggering mistakenly, and providing a current path for the first voltage stabilizing diode and the second voltage stabilizing diode; the first voltage stabilizing diode and the second voltage stabilizing diode are used for controlling the conduction time of the bidirectional controllable silicon together; the rectifier bridge is used for converting alternating current into direct current and charging the polar capacitor; and the polar capacitor is used for storing charge and filtering.

4. An alternating current series connection power taking circuit as claimed in claim 1, wherein the bidirectional thyristor can be replaced by two unidirectional thyristors with the same specification and parameters; the first voltage stabilizing diode and the second voltage stabilizing diode are devices with the same model, specification and parameter; the first voltage stabilizing diode and the second voltage stabilizing diode can be replaced by other devices with voltage stabilizing functions, including but not limited to TVS (transient voltage suppressor) and ESD (electro-static discharge) devices, and the models, specifications and parameters of the replaced devices are consistent; the rectifier bridge can be realized by adopting an integrated circuit or a combination of four general diodes with the same type, specification and parameter; the polar capacitor should be a capacitor with a capacitance of microfarad.

5. an ac series circuit as claimed in claim 1, wherein the output voltage is calculated by the formula:Wherein the content of the first and second substances,to the resulting output voltage;is the reverse breakdown voltage of the first zener diode or the second zener diodeThe reverse breakdown voltage of the zener diode;The forward conduction voltage drop of the first voltage stabilizing diode or the forward conduction voltage drop of the second voltage stabilizing diode;is the conduction voltage drop of the rectifier bridge.

Technical Field

The invention relates to the field of electronic switches, in particular to an alternating current series power-taking circuit.

background

the electronic switch is gradually moving to thousands of families with abundant functions, reliable performance and good user experience, but still faces some technical problems which are not solved or not well solved on the popularization way, for example, many products can be normally used only by being connected with a zero line, and the actual situation is that the zero line is not arranged at the installation position of the lighting switch of most families.

Under the single live wire scene without arranging a zero line, the electronic switch can only be used as a path for acquiring electric energy through a load, but after the electronic switch is in an on state, because the electronic switch is in a low-resistance state at the moment, an internal power supply of the electronic switch stops working and cannot continuously provide electric energy for the electronic switch, and therefore, how to ensure the normal work of the electronic switch under the condition is a technical difficulty.

the existing technical scheme capable of solving the problems is generally complex in structure, uses a large number of electronic components, and even needs programming to realize power taking, so that the development cycle of related products is prolonged, the difficulty is increased, and the cost is increased.

Disclosure of Invention

The invention aims to solve the problems in the technical background by providing a technical scheme which is simple in structure, easy to realize and low in cost.

In order to achieve the above object, the present invention provides an ac series power-taking circuit, which comprises a bidirectional thyristor, a resistor, a first zener diode, a second zener diode, a rectifier bridge, and a polar capacitor; the first anode of the bidirectional thyristor, the first pin of the resistor and the first alternating current input pin of the rectifier bridge are connected with a live wire together; a second anode of the bidirectional controllable silicon, a cathode of the second voltage stabilizing diode and a second alternating current input pin of the rectifier bridge are connected with a first pin of a load together; the gate pole of the bidirectional controllable silicon and the second pin of the resistor are connected with the cathode of the first voltage stabilizing diode; the anode of the first voltage stabilizing diode is connected with the anode of the second voltage stabilizing diode; the positive electrode of the rectifier bridge is connected with the positive electrode of the polar capacitor; the negative electrode of the rectifier bridge and the negative electrode of the polar capacitor are connected with a reference ground together; and a second pin of the load is connected with the zero line.

It should be noted that the simultaneous reverse connection of the first zener diode and the second zener diode, i.e., the connection of the cathode of the first zener diode and the cathode of the second zener diode, does not affect the final effect of the whole circuit.

The bidirectional thyristor is used for switching on or switching off a load working loop; the resistor is used for preventing the bidirectional controllable silicon from being interfered and triggering mistakenly, and providing a current path for the first voltage stabilizing diode and the second voltage stabilizing diode; the first voltage stabilizing diode and the second voltage stabilizing diode are used for controlling the conduction time of the bidirectional controllable silicon together; the rectifier bridge is used for converting alternating current into direct current and charging the polar capacitor; and the polar capacitor is used for storing charge and filtering.

It should also be noted that:

The bidirectional controllable silicon can be replaced by two unidirectional controllable silicon with the same specification and parameter; the first voltage stabilizing diode and the second voltage stabilizing diode are devices with the same model, specification and parameter; the first voltage stabilizing diode and the second voltage stabilizing diode can be replaced by other devices with voltage stabilizing functions, including but not limited to TVS (transient voltage suppressor) and ESD (electro-static discharge) devices, and the models, specifications and parameters of the replaced devices are consistent; the rectifier bridge can be realized by adopting an integrated circuit or a combination of four general diodes with the same type, specification and parameter; the polar capacitor should be a capacitor with a capacitance of microfarad.

The working principle and the working process of the invention are as follows:

When the voltage between the live wire and the zero line is smaller than the sum of the reverse breakdown voltage of the first voltage stabilizing diode and the forward conduction voltage drop of the second voltage stabilizing diode, or when the voltage between the live wire and the zero line is smaller than the sum of the reverse breakdown voltage of the second voltage stabilizing diode and the forward conduction voltage drop of the first voltage stabilizing diode, the bidirectional thyristor is cut off, and at the moment, the alternating current flowing through the load is rectified by the rectifier bridge to charge the polar capacitor;

When the voltage between the live wire and the zero line is greater than or equal to the sum of the reverse breakdown voltage of the first voltage stabilizing diode and the forward conduction voltage drop of the second voltage stabilizing diode, or when the voltage between the live wire and the zero line is greater than or equal to the sum of the reverse breakdown voltage of the second voltage stabilizing diode and the forward conduction voltage drop of the first voltage stabilizing diode, the bidirectional thyristor is conducted, and the current flows through the bidirectional thyristor along with the current, stops flowing through the rectifier bridge and stops charging the polar capacitor;

The above process is repeated with the period of the voltage between the live wire and the zero wire changing alternately, because the polar capacitor has the charge storage capacity, when no load or light load is connected to the two ends of the polar capacitor, the voltage at the two ends of the polar capacitor will remain unchanged or slightly decrease, and the polar capacitor simultaneously plays a role of filtering, so that a stable direct current output voltage is obtained, and the calculation formula of the output voltage is as follows:Wherein the content of the first and second substances,to the resulting output voltage;Is the reverse breakdown voltage of the first zener diode or the reverse breakdown voltage of the second zener diode;The forward conduction voltage drop of the first voltage stabilizing diode or the forward conduction voltage drop of the second voltage stabilizing diode;Is the conduction voltage drop of the rectifier bridge.

The beneficial effects obtained by the invention are as follows:

The alternating current series connection power taking circuit provided by the invention has the advantages of simple structure and low cost, and can realize the alternating current series connection power taking function under the condition of no need of programming.

Drawings

Fig. 1 is a circuit diagram of an ac series power-taking circuit according to a preferred embodiment of the invention.

Fig. 2 is an equivalent circuit diagram of an ac series power-taking circuit according to a preferred embodiment of the invention.

fig. 3 is a diagram of input/output voltage waveforms of an ac series power-taking circuit according to a preferred embodiment of the invention.

Detailed Description

the technical solutions of the present invention are described in detail below with reference to the drawings and examples, so that those skilled in the art can fully and completely implement the technical solutions of the present invention on the basis of reading the present specification.

it should be noted that the following is only a preferred embodiment of the present invention, and not to limit the scope of the invention, and it will be apparent to those skilled in the art that several modifications and improvements can be made without departing from the inventive concept of the present invention, and these should fall within the scope of the present invention, and therefore, all changes in equivalent structure or equivalent flow process that can be made by using the contents of the present specification and drawings, or applied directly or indirectly to other related technical fields, and other embodiments obtained by those skilled in the art based on the embodiments given in the present invention without creative efforts will fall within the scope of the present invention.

as shown in fig. 1, a preferred embodiment of the present invention provides an ac series power-obtaining circuit, which includes a triac Q1, a resistor R1, a first zener diode D1, a second zener diode D2, a rectifier bridge D3, and a polar capacitor C1; a first anode of the bidirectional thyristor Q1, a first pin of the resistor R1 and a first alternating current input pin of the rectifier bridge D3 are connected with a live wire L; a second anode of the bidirectional thyristor Q1, a cathode of the second voltage-regulator diode D2 and a second alternating current input pin of the rectifier bridge D3 are connected with a first pin of a load; the gate of the bidirectional thyristor Q1 and the second pin of the resistor R1 are connected with the cathode of a first voltage-stabilizing diode D1; the anode of the first zener diode D1 is connected to the anode of the second zener diode D2; the positive electrode of the rectifier bridge D3 is connected with the positive electrode of the polar capacitor C1; the negative electrode of the rectifier bridge D3 and the negative electrode of the polar capacitor C1 are connected with the reference ground in common; and a second pin of the load is connected with a zero line N.

As shown in fig. 2, the first zener diode D1 and the second zener diode D2 are connected in reverse direction at the same time, i.e., the cathode of the first zener diode D1 is connected to the cathode of the second zener diode D2, which does not affect the final effect of the whole circuit.

a triac Q1 for switching on or off the load circuit; the resistor R1 is used for preventing the triac Q1 from being interfered and being triggered by mistake, and providing a current path for the first voltage stabilizing diode D1 and the second voltage stabilizing diode D2; the first voltage stabilizing diode D1 and the second voltage stabilizing diode D2 are used for controlling the conduction time of the bidirectional thyristor Q1; the rectifier bridge D3 is used for converting alternating current into direct current and charging the polar capacitor C1; and a polar capacitor C1 for storing charge and filtering.

The working principle and the working process of the preferred embodiment of the invention are as follows:

when the voltage between the live wire L and the zero wire N is smaller than the sum of the reverse breakdown voltage of the first voltage-stabilizing diode D1 and the forward conduction voltage drop of the second voltage-stabilizing diode D2, or when the voltage between the live wire L and the zero wire N is smaller than the sum of the reverse breakdown voltage of the second voltage-stabilizing diode D2 and the forward conduction voltage drop of the first voltage-stabilizing diode D1, the bidirectional thyristor Q1 is cut off, and at the moment, the alternating current flowing through the load is rectified by the rectifier bridge D3 to charge the polar capacitor C1;

when the voltage between the live wire L and the zero wire N is larger than or equal to the sum of the reverse breakdown voltage of the first voltage-stabilizing diode D1 and the forward conduction voltage drop of the second voltage-stabilizing diode D2, or when the voltage between the live wire L and the zero wire N is larger than or equal to the sum of the reverse breakdown voltage of the second voltage-stabilizing diode D2 and the forward conduction voltage drop of the first voltage-stabilizing diode D1, the bidirectional controlled silicon Q1 is conducted, current flows through the bidirectional controlled silicon Q1, the current stops flowing through the rectifier bridge D3, and the charging of the polar capacitor C1 is stopped;

The above process is repeated with the period of the voltage between the live line L and the zero line N changing alternately, because the polar capacitor C1 has the charge storage capacity, when no load or light load is connected to the two ends of the polar capacitor C1, the voltage at the two ends of the polar capacitor C1 will remain unchanged or slightly decrease, and the polar capacitor C1 plays a role of filtering at the same time, so that a stable dc output voltage is obtainedoutput voltageThe calculation formula is as follows:wherein the content of the first and second substances,To the resulting output voltage;is the reverse breakdown voltage of the first zener diode D1 or the reverse breakdown voltage of the second zener diode D2;Is the forward conduction voltage drop of the first zener diode D1 or the forward conduction voltage drop of the second zener diode D2;is the conduction voltage drop of the rectifier bridge D3.

As shown in fig. 3, the longitudinal axisThe voltage of the live line L and the zero line N, namely an input voltage axis; longitudinal axisThe voltage across polarity capacitor C1, i.e., the output voltage axis; transverse axisIs a time axis;is the positive peak of the input voltage;is the inverse peak value of the input voltage;Is the sum of the reverse breakdown voltage of the first zener diode D1 and the forward conduction voltage drop of the second zener diode D2;is the sum of the reverse breakdown voltage of the second zener diode D2 and the forward conduction voltage drop of the first zener diode D1;Is the conduction voltage drop of the rectifier bridge D3;To the final output voltage;

When atToAt a certain time interval,tooutput voltage during time intervalRises as polarity capacitor C1 charges; when atToat a certain time interval,to、tooutput voltage during time intervaldecreases as polar capacitor C1 discharges; due to the discharge speed relative to the charge speedmuch slower, therefore, although the output voltage isThe fluctuation can occur, but the macroscopic trend still tends to a stable state, which mainly depends on the power consumption of the load connected to the output end, and the larger the power consumption of the load is, the larger the fluctuation of the output voltage is, the smaller the power consumption of the load is, and the smaller the fluctuation of the output voltage is.

It should be noted that, the waveform diagram of the input/output voltage of the ac series power-taking circuit according to the preferred embodiment of the present invention shown in fig. 3 is a waveform diagram when the output terminal is connected to a load, and is not a waveform diagram when the output terminal is unloaded.