CN221806747U - Station topology transmitting circuit - Google Patents

Abstract

The present application relates to a station area topology sending circuit, including: an input circuit for inputting a characteristic current signal of a load; a transformer circuit coupled to the input circuit, which transforms the input characteristic current signal from a strong electric signal into a weak electric signal; a rear stage circuit coupled to the transformer circuit and receives the transformed characteristic current signal, and outputs the processed characteristic current signal; a switch circuit coupled to the rear stage circuit, the switch circuit responds to the processed characteristic current signal and sends it to the power line; a rectifier circuit coupled between the switch circuit and the power line, which rectifies the high-voltage AC signal of the power line into a positive half-cycle voltage signal to power the switch circuit. According to the station area topology sending circuit provided by the present application, the rear stage circuit does not need to set up a separate power supply system, the circuit structure is simple, and it is convenient for the miniaturization of the circuit hardware module, and the cost is lower. By modulating the frequency of the electrical signal through the signal modulation circuit, the volume and cost of the transformer can also be reduced.

Description

Station topology transmitting circuit

Technical Field

The application relates to the technical field of circuit structures, in particular to a district topology transmitting circuit.

Background

At present, a transformer area topology identification transmitting circuit in a low-voltage power topology identification system is used for topology phase identification of the low-voltage power system. The slave terminal equipment comprising the platform area topology identification transmitting circuit transmits a characteristic current signal, the master control equipment acquires the characteristic current signal of the slave terminal equipment, and the master control system calculates and analyzes the characteristic current signal to obtain the special information of the characteristic current signal, so that the phase and topology of the slave terminal equipment are judged. The phase and topology information of the slave device on the power line are very important for carrier communication, and a carrier system can utilize the topology and phase information to improve networking efficiency and meter reading success rate.

In the platform region topology identification transmitting circuit in the prior art, a pulse width modulation PWM (Pulse Width Modulation) signal is controlled by an optical coupler through a driving circuit, the optical coupler transmits the pulse width modulation PWM signal to a switch switching circuit, the switch switching circuit controls the on and off of a metal oxide semiconductor MOS (Metal Oxide Semiconductor) tube, and a load is added on a power line when a MOS tube is on, so that a characteristic current signal is generated. The platform region topology identification transmitting circuit is provided with an independent strong-current side power supply for providing electric energy for the optocouplers and the switch switching circuit.

However, in the prior art, the structure of the area topology identification transmitting circuit is too complex, and the hardware cost is high; in addition, the driving signal of the driving circuit can drive the MOS tube to be turned on and off only through the optocoupler and the switch switching circuit, and the switch switching circuit controls the switch to have great time delay and deviation, so that the precision of the pulse is required to be corrected by software; furthermore, the optocoupler and the switch switching circuit need to have separate power supply on the strong electric side, so that when the circuit is static, one additional power consumption is added on the strong electric side, the static power consumption of the slave device can be increased, and the power consumption of the whole module can possibly exceed the standard.

Disclosure of utility model

Aiming at the problems existing in the prior art, the application provides a station topology transmitting circuit, which comprises:

An input circuit for inputting a characteristic current signal of a load;

the transformation circuit is coupled with the input circuit and converts the input characteristic current signal into a weak current signal from a strong electric signal in a transformation way;

The post-stage circuit is coupled to the transformation circuit and receives the transformed characteristic current signal, and comprises a half-wave rectification module, a voltage stabilizing module and a filtering module which are sequentially coupled, wherein the post-stage circuit is respectively used for sequentially carrying out half-wave rectification, voltage stabilization and filtering on the transformed characteristic current signal and outputting the processed characteristic current signal;

A switching circuit coupled to the post-stage circuit, the switching circuit being responsive to the processed characteristic current signal and transmitting to a power line;

And the rectification circuit is coupled between the switching circuit and the power line, rectifies the power line high-voltage alternating current signal into a positive half-cycle voltage signal and supplies power for the switching circuit.

According to some embodiments, the input circuit comprises:

And the PWM module is used for inputting a characteristic current original signal of the load.

According to some embodiments, the input circuit further comprises:

And the signal modulation module is coupled with the PWM module and used for modulating the characteristic current original signal to the required signal frequency and sending the modulated characteristic current signal to the voltage transformation circuit.

According to some embodiments, the transformation circuit comprises:

the driving module is coupled to the output end of the input circuit; and

The strong current side of the transformer is coupled with the driving module, and the weak current side of the transformer is coupled with the rear-stage circuit;

the driving module supplies power to the transformer to drive the transformer to conduct.

According to some embodiments, the half-wave rectification module comprises a rectification diode, an anode of the rectification diode is coupled to the weak current side loop of the transformer, and a cathode outputs a half-wave rectification signal;

The voltage stabilizing module comprises a voltage stabilizing diode, wherein the cathode of the voltage stabilizing diode is coupled with the cathode of the rectifying diode, and the anode of the voltage stabilizing diode is coupled with the grounding end for supplying power to the transmitting circuit;

The filtering module comprises an energy storage filtering capacitor which is connected with the voltage stabilizing diode in parallel.

According to some embodiments, the switching circuit comprises:

The grid electrode of the MOS tube is coupled with the output end of the rear-stage circuit, and the drain electrode of the MOS tube is coupled with the power supply end of the transmitting circuit; and

And the feedback resistor is connected in series between the source electrode of the MOS tube and the grounding end for supplying power to the transmitting circuit.

According to some embodiments, the post-stage circuit further comprises:

and the pull-down resistor is connected with the energy storage filter capacitor in parallel and is used for rapidly pulling down the potential to close the MOS tube when no characteristic current signal is input.

According to some embodiments, the rectifying circuit includes:

an alternating current power supply for supplying alternating current; and

And the rectifier bridge is connected with the alternating current power supply and is used for converting the alternating current into direct current.

According to some embodiments, the rectifying circuit further comprises:

the fuse is connected in series with the alternating current power supply and is used for preventing the rectifying circuit from being burnt out due to overlarge current;

The filtering circuit is connected with the rectifier bridge in parallel and is used for filtering frequency waves of the alternating current; and

And the current limiting resistor is connected in series with the alternating current power supply and is used for limiting the current of the alternating current.

According to some embodiments, the rectifier bridge comprises four independent diodes.

According to the platform region topology transmitting circuit provided by the application, the signal transformer is adopted for driving, and the characteristic current signal and the energy for driving the later stage are transmitted, so that compared with an optocoupler driving mode, the later stage circuit does not need to be provided with an independent power supply system, the platform region topology transmitting circuit is simple in structure, convenient for miniaturization of circuit hardware modules and lower in cost; in addition, the transformer directly drives the MOS tube, a triode switch switching circuit is omitted, the response is faster, and the precision is higher; furthermore, the strong electric side of the circuit does not need to independently provide power, the static power consumption is greatly reduced while devices are saved, and the power consumption in the static state is almost zero.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it will be apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings by those skilled in the art without departing from the scope of the claimed application.

Fig. 1 is a schematic diagram of the composition of a station topology transmission circuit according to one embodiment of the present application.

Fig. 2 is a block diagram of a characteristic current signal transmission circuit of a site topology transmission circuit according to an embodiment of the present application.

Fig. 3 is a block diagram of a rectifying circuit of a site topology transmission circuit according to an embodiment of the present application.

Fig. 4 is a pulse diagram of a signature current raw signal at 8333.3Hz frequency according to one embodiment of the application.

Fig. 5 is a pulse diagram of a characteristic current signal modulated by a signal modulation module from a characteristic current original signal having a frequency of 8333.3Hz according to one embodiment of the application.

Fig. 6 is a timing diagram of the characteristic current signals on the power lines of the bay topology transmission circuit according to one embodiment of the present application.

Reference numerals: t1 transformer, D1 zener diode, D2 rectifier diode, C1 energy storage filter capacitor, R3 pull-down resistance, V1 alternating current power supply, U1 rectifier bridge, F1 fuse, C2 filter capacitor, R4 feedback resistance, Q1 MOS pipe, R1, R2 current-limiting resistor, VL power supply end, VN ground terminal.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The application provides a station topology transmitting circuit, which comprises a characteristic current signal transmitting circuit and a rectifying circuit, wherein fig. 1 is a schematic diagram of the composition of the station topology transmitting circuit according to one embodiment of the application, fig. 2 is a structural diagram of the characteristic current signal transmitting circuit of the station topology transmitting circuit according to one embodiment of the application, and fig. 3 is a structural diagram of the rectifying circuit of the station topology transmitting circuit according to one embodiment of the application. As shown in fig. 1, the bay topology transmitting circuit includes an input circuit, a transformation circuit, a post-stage circuit, a switching circuit, and a rectifying circuit.

According to some embodiments, the input circuit is for inputting a characteristic current signal of the load. According to one embodiment, as shown in fig. 2, the input circuit includes a PWM module, wherein the PWM module provides the characteristic current raw signal. According to some embodiments, the input circuit is coupled to the transformer circuit, the input circuit providing the characteristic current signal to the transformer circuit.

According to some embodiments, the input circuit may further include a signal modulation module coupled to the PWM module. The PWM module provides a characteristic current raw signal that is typically a low frequency signal around several 1K (e.g., a characteristic current raw signal at 833.3Hz frequency, as shown in fig. 4). The signal modulation module modulates the frequency of the characteristic current original signal provided by the PWM module to the required signal frequency by using the modulation frequency, and sends the modulated characteristic current signal to the voltage transformation circuit. The latter circuit plays a role in demodulation, removes the modulation frequency of the signal, recovers the original signal and drives the high-voltage MOS tube.

According to some embodiments, the modulation frequency of the signal modulation module may be weighted according to the operating state of the transmission circuit of the station topology and the transformer type. Under the condition that the signal modulation frequency is not very high, the signal modulation module can be realized by software, and no additional signal modulation circuit hardware is required to be added. According to one embodiment, the modulation frequency of the signal modulation module may be more than one hundred K modulation frequency, and the signal modulation module modulates the characteristic current original signal shown in fig. 4 by using more than one hundred K modulation frequency, so that the obtained characteristic current signal is shown in fig. 5.

The characteristic current standard is defined as low-frequency signals near 1K, such as the characteristic current original signal shown in fig. 4, if the signal transmitted by the subsequent stage of the transformer is expected to be undistorted, the inductance of the transformer is required to be large, at least mH or more, so that the volume and cost of the transformer are increased, and the miniaturization and low power consumption of the module are not facilitated. After modulation by the signal modulation module, a transformer with a small inductance value can be selected in the transformer area topology transmitting circuit, the volume is smaller, and the energy storage filter capacitor can select a smaller capacitance value. Thus, the original signal of the characteristic current is modulated, the hardware cost of the circuit can be reduced, and the circuit is smaller in size.

According to some embodiments, a transformation circuit is coupled to the input circuit for transforming the characteristic current signal provided by the input circuit from a strong electrical signal to a weak electrical signal. According to one embodiment, a transformation circuit includes a drive module and a transformer. The characteristic current signal provided by the input circuit is smaller and cannot directly drive the transformer to be conducted, and the driving module is respectively coupled with the output end of the input circuit and the strong current side of the transformer and can amplify the characteristic current signal provided by the input circuit to be enough to drive the transformer to be conducted. The weak electricity of the transformer is coupled with the post-stage circuit, and the transformer transmits the characteristic current signal to the post-stage circuit to provide electric energy for the post-stage circuit. Therefore, the later-stage circuit does not need to be provided with a power supply independently, so that the circuit structure is simpler, and the cost is lower.

According to some embodiments, the post-stage circuit is coupled to the transformation circuit and receives the transformed signature circuit signal. According to one embodiment, the post-stage circuit comprises a half-wave rectifying module, a voltage stabilizing module and a filtering module which are sequentially coupled, and the half-wave rectifying module, the voltage stabilizing module and the filtering module are respectively used for sequentially carrying out half-wave rectifying, voltage stabilizing and filtering processing on the characteristic current signal after transformation, and outputting the characteristic current signal after processing.

According to some embodiments, the half-wave rectification module comprises a rectification diode, which performs half-wave rectification on the characteristic current signal transmitted by the transformer. As shown in fig. 2, the anode of the rectifying diode is coupled to the weak current side loop of the transformer, and the cathode outputs a half-wave rectifying signal. According to one embodiment, the voltage stabilizing module comprises a voltage stabilizing diode, the voltage stabilizing diode stabilizes the voltage of the received characteristic current signal at the rated voltage of the voltage stabilizing diode, as shown in fig. 2, the cathode of the voltage stabilizing diode is coupled to the cathode of the rectifying diode, and the anode is coupled to the ground terminal for supplying power to the transmitting circuit. The filtering module comprises an energy storage filtering capacitor, the energy storage filtering capacitor stores and filters the received characteristic current signal, and the energy storage filtering capacitor is connected with the voltage stabilizing diode in parallel as shown in fig. 2.

According to some embodiments, the signal modulation module adjusts the frequency of the original signal of the characteristic current and transmits the adjusted frequency to a post-stage circuit, and the post-stage circuit outputs the processed signal of the characteristic current through half-wave rectification, voltage stabilization and filtering. The half-wave rectification module, the voltage stabilizing module and the filtering module can play a role in demodulation at the same time, so that the modulating frequency of the characteristic current signal modulated by the signal modulating module is removed, and the characteristic current signal before the modulating frequency is not used by the signal modulating module for adjustment is obtained.

According to some embodiments, a switching circuit is coupled to the post-stage circuit, the switching circuit being responsive to the processed characteristic current signal and transmitting to the power line. According to one embodiment, as shown in fig. 2, the switching circuit includes a MOS transistor and a feedback resistor, wherein a gate of the MOS transistor is coupled to an output terminal of the post-stage circuit, and a drain of the MOS transistor is coupled to a power supply terminal of the power supply of the station topology transmitting circuit. The feedback resistor is connected in series between the source electrode of the MOS tube and the grounding end for supplying power to the transmitting circuit, and the feedback resistor maintains the working current of the MOS tube after being started to be constant. The back-stage circuit can rectify the signal transmitted by the signal transformation into direct current, and stabilize the voltage at a fixed value for opening the MOS tube, and when the signal transmitted by the signal transformation is not transmitted, the MOS tube is closed.

According to some embodiments, the post-stage circuit may further include a pull-down resistor connected in parallel with the tank filter capacitor. When no characteristic current signal is input, the pull-down resistor rapidly pulls down the energy stored by the energy storage filter capacitor, closes the MOS tube, and improves the closing speed of the MOS tube.

According to some embodiments, the rectifying circuit is coupled between the switching circuit and the power line, rectifies a high voltage ac signal of the power line into a positive half cycle voltage signal, and supplies power to the switching circuit. According to some embodiments, as shown in fig. 3, the rectifying circuit includes an ac power source and a rectifying bridge. The alternating current power supply provides alternating current, and the rectifier bridge is connected with the alternating current power supply and converts the alternating current into direct current.

According to some embodiments, as shown in fig. 3, the rectifying circuit further includes a fuse, a filter circuit, and a current limiting resistor. The fuse is connected with the alternating current power supply in series, so that the current of the alternating current power supply can be prevented from being excessively large to burn the rectifying circuit. The filtering circuit is connected in parallel with the rectifier bridge and can filter the frequency wave of the alternating current (for example, the high frequency component on the alternating current filtering line). The current limiting resistor is connected with the alternating current power supply in series, and can limit the current of alternating current flowing to the rectifier bridge.

According to some embodiments, as shown in fig. 3, the rectifier bridge is formed by connecting four independent diodes, and the filter circuit is a filter capacitor. The number of the current limiting resistors can be set according to actual requirements, and according to one embodiment, the number of the current limiting resistors is two.

According to some embodiments, as shown in fig. 2 and 3, after the MOS transistor is driven to be turned on by the characteristic current signal, the MOS transistor operates in the constant current region, and the alternating current flows from the alternating current power supply, sequentially flows through one resistor of the fuse and the current limiting resistor, the rectifier bridge, the MOS transistor, the feedback resistor, the rectifier bridge, and the other resistor of the current limiting resistor, and finally returns to the alternating current power supply, so that a loop is formed, and a constant current load is generated on the alternating current. At the same time, a current signal is generated on the power line of the ac power supply, for example a current signal offset around 50HZ, wherein the current signal is used for identification of the master device.

In the embodiments shown in fig. 1 to 3, the current composition and structure of the input circuit, the transformer circuit, the post-stage circuit, the switch circuit, and the rectifier circuit are not limited to the specific forms given in the embodiments; the PWM module, the signal modulation module, the driving module, the transformer, the ac power supply, the rectifier bridge, etc., and any suitable module or structure may be adopted as long as the technical scheme of the present application can be implemented; the number and connection modes of the devices, such as rectifier diodes, zener diodes, capacitors, resistors, etc., that constitute the topology transmission circuit of the transformer area in the embodiment are not limited to the number and connection modes shown in the embodiment, and the number of the devices can be increased or decreased and the connection modes can be adjusted as long as the technical scheme of the application can be implemented, which belongs to the coverage of the application.

Fig. 6 is a timing diagram of the characteristic current signals on the power lines of the bay topology transmission circuit according to one embodiment of the present application. As shown in fig. 6, the signal frequency, the timing and the duty ratio completely meet the design requirements, and the precision is higher.

The foregoing has outlined rather broadly the more detailed description of embodiments of the application in order that the detailed description of the principles and embodiments of the application may be implemented in conjunction with the detailed description of embodiments of the application that follows. Meanwhile, based on the idea of the present application, those skilled in the art can make changes or modifications on the specific embodiments and application scope of the present application, which belong to the protection scope of the present application. In view of the foregoing, this description should not be construed as limiting the application.

Claims (10)

1. A station topology transmission circuit, comprising:

An input circuit for inputting a characteristic current signal of a load;

the transformation circuit is coupled with the input circuit and converts the input characteristic current signal into a weak current signal from a strong electric signal in a transformation way;

The post-stage circuit is coupled to the transformation circuit and receives the transformed characteristic current signal, and comprises a half-wave rectification module, a voltage stabilizing module and a filtering module which are sequentially coupled, wherein the post-stage circuit is respectively used for sequentially carrying out half-wave rectification, voltage stabilization and filtering on the transformed characteristic current signal and outputting the processed characteristic current signal;

A switching circuit coupled to the post-stage circuit, the switching circuit being responsive to the processed characteristic current signal and transmitting to a power line;

And the rectification circuit is coupled between the switching circuit and the power line, rectifies the power line high-voltage alternating current signal into a positive half-cycle voltage signal and supplies power for the switching circuit.

2. The circuit of claim 1, wherein the input circuit comprises:

And the PWM module is used for inputting a characteristic current original signal of the load.

3. The circuit of claim 2, wherein the input circuit further comprises:

And the signal modulation module is coupled with the PWM module and used for modulating the characteristic current original signal to the required signal frequency and sending the modulated characteristic current signal to the voltage transformation circuit.

4. A circuit according to any one of claims 1 to 3, wherein the transformation circuit comprises:

the driving module is coupled to the output end of the input circuit; and

The strong current side of the transformer is coupled with the driving module, and the weak current side of the transformer is coupled with the rear-stage circuit;

the driving module supplies power to the transformer to drive the transformer to conduct.

5. The circuit of claim 4, wherein the circuit further comprises a logic circuit,

The half-wave rectification module comprises a rectification diode, the anode of the rectification diode is coupled to the weak current side loop of the transformer, and the cathode outputs a half-wave rectification signal;

The voltage stabilizing module comprises a voltage stabilizing diode, wherein the cathode of the voltage stabilizing diode is coupled with the cathode of the rectifying diode, and the anode of the voltage stabilizing diode is coupled with the grounding end for supplying power to the transmitting circuit;

The filtering module comprises an energy storage filtering capacitor which is connected with the voltage stabilizing diode in parallel.

6. The circuit of claim 5, wherein the switching circuit comprises:

The grid electrode of the MOS tube is coupled with the output end of the rear-stage circuit, and the drain electrode of the MOS tube is coupled with the power supply end of the transmitting circuit; and

And the feedback resistor is connected in series between the source electrode of the MOS tube and the grounding end for supplying power to the transmitting circuit.

7. The circuit of claim 6, wherein the post-stage circuit further comprises:

and the pull-down resistor is connected with the energy storage filter capacitor in parallel and is used for rapidly pulling down the potential to close the MOS tube when no characteristic current signal is input.

8. A circuit according to any one of claims 1 to 3, wherein the rectifying circuit comprises:

an alternating current power supply for supplying alternating current; and

And the rectifier bridge is connected with the alternating current power supply and is used for converting the alternating current into direct current.

9. The circuit of claim 8, wherein the rectifying circuit further comprises:

the fuse is connected in series with the alternating current power supply and is used for preventing the rectifying circuit from being burnt out due to overlarge current;

The filtering circuit is connected with the rectifier bridge in parallel and is used for filtering frequency waves of the alternating current; and

And the current limiting resistor is connected in series with the alternating current power supply and is used for limiting the current of the alternating current.

10. The circuit of claim 8, wherein the rectifier bridge comprises four independent diodes.