CN215420232U

CN215420232U - Charge accuse circuit breaker is with sharing positive pole signal conversion circuit

Info

Publication number: CN215420232U
Application number: CN202120605428.4U
Authority: CN
Inventors: 谈赛; 龙友贤; 程建; 贾俊; 戴旭毅; 苏西蒙
Original assignee: Wasion Electric Co Ltd
Current assignee: Weisheng Energy Technology Co ltd
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2022-01-04
Anticipated expiration: 2031-03-25

Abstract

The utility model relates to a common anode signal conversion circuit for a cost-controlled circuit breaker, which consists of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an optocoupler U1, a capacitor C1, a capacitor C2, a diode D1, a diode D2, a PMOS tube V1 and a PMOS tube V2. The circuit overcomes the problem that a conventional fee control signal conversion circuit needs an independent power supply, is driven only by depending on a signal output by a fee control signal on the basis of not needing an external independent power supply, can realize the connection with a circuit breaker of a common anode remote control input contact, realizes the fee control function, and has the characteristics of extremely low power consumption, low cost, simple circuit and reliable operation.

Description

Charge accuse circuit breaker is with sharing positive pole signal conversion circuit

Technical Field

The utility model relates to the field of signal conversion circuits, in particular to a common anode signal conversion circuit for a cost-controlled circuit breaker.

Background

The existing fee control electric energy meter has the charge control signal of an alternating current signal, when the electric energy meter is in a fee state, a fee control output contact inside the electric energy meter is closed, and at the moment, the output voltage is the fee control signal of AC 220V. When the electric energy meter is in an arrearage state, the fee control output contact in the electric energy meter is disconnected, and the output voltage is 0 at the moment. And the corresponding cost control special circuit breaker determines whether the circuit breaker is in a closing state or an opening state by receiving the cost control signal.

However, for the non-cost-control-based special circuit breaker, since the signal access point for controlling opening and closing is an active contact, the voltage of the active contact is generally direct current low voltage, and the active contact cannot be compatible with the output voltage of the cost-control contact of the existing cost-control electric energy meter, the conversion needs to be performed through a cost-control signal conversion circuit. The conventional charge control signal conversion circuit performs conversion through an active level conversion circuit, but the circuit needs an independent power supply, is complex, high in cost and high in power consumption, and is not suitable for charge control conversion occasions.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a common anode signal conversion circuit for a cost-controlled circuit breaker, which is composed of an optical coupler U1, a PMOS transistor V1, a PMOS transistor V2, a diode D1, a diode D2, resistors R1, R2, R3, R4, R5, capacitors C1 and C2. The anode of the optical coupler U1 is connected with an electric energy meter cost control signal output contact FK _ L through the resistor R2, the cathode of the optical coupler U1 is connected with an electric energy meter cost control signal output contact FK _ N, the collector of the optical coupler U1 is connected with the source of the PMOS tube V1 through the resistor R1, the grid of the PMOS tube V1 is connected with the emitter of the optical coupler U1, the source of the PMOS tube V1 is connected with a breaker common anode power supply contact COM +, the drain of the PMOS tube V1 is connected with the cathode of the diode D2, two ends of the capacitor C1 are respectively connected with the source and the grid of the PMOS tube V1, the cathode of the diode D1 is connected with a breaker control closing input contact HZ-, the anode of the diode D1 is connected with the emitter of the optical coupler U1 through the resistor R4, and the cathode of the diode D2 is connected with a breaker control opening input contact FZ-, the anode of the diode D2 is connected with the emitter of the optocoupler U1 through the resistor R4, the gate of the PMOS transistor V2 is connected with the cathode of the diode D2 through the resistor R5, the source of the PMOS transistor V2 is connected with a common anode power supply contact COM + of a circuit breaker, the drain of the PMOS transistor V2 is connected with the cathode of the diode D1, and the resistor R3 and the capacitor C2 are connected in parallel between the gate and the source of the PMOS transistor V2.

Preferably, the current transmission ratio of the optical coupler U1 is 300-600%.

Preferably, the ratio of the resistance value of the resistor R4 to the resistance value of the resistor R1 is 100 times to 1000 times.

Preferably, the ratio of the resistance value of the resistor R5 to the resistance value of the resistor R3 is 1 to 10 times.

Preferably, the resistances of the resistor R4 and the resistor R3 are in the megaohm range.

The circuit overcomes the problem that a conventional fee control signal conversion circuit needs an independent power supply, is driven only by depending on a signal output by a fee control signal on the basis of not needing an external independent power supply, can realize the connection with a circuit breaker of a common anode remote control input contact, realizes the fee control function, and has the characteristics of extremely low power consumption, low cost, simple circuit and reliable operation.

Drawings

Fig. 1 is a circuit diagram of a common anode signal conversion circuit for a cost-controlled circuit breaker.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

As shown in fig. 1, the common anode signal conversion circuit for the cost-controlled circuit breaker comprises an optical coupler U1, a PMOS transistor V1, a PMOS transistor V2, a diode D1, a diode D2, resistors R1, R2, R3, R4, R5, capacitors C1 and C2. The anode of the optical coupler U1 is connected with an electric energy meter cost control signal output contact FK _ L through the resistor R2, the cathode of the optical coupler U1 is connected with an electric energy meter cost control signal output contact FK _ N, the collector of the optical coupler U1 is connected with the source of the PMOS tube V1 through the resistor R1, the grid of the PMOS tube V1 is connected with the emitter of the optical coupler U1, the source of the PMOS tube V1 is connected with a breaker common anode power supply contact COM +, the drain of the PMOS tube V1 is connected with the cathode of the diode D2, two ends of the capacitor C1 are respectively connected with the source and the grid of the PMOS tube V1, the cathode of the diode D1 is connected with a breaker control closing input contact HZ-, the anode of the diode D1 is connected with the emitter of the optical coupler U1 through the resistor R4, and the cathode of the diode D2 is connected with a breaker control opening input contact FZ-, the anode of the diode D2 is connected with the emitter of the optocoupler U1 through the resistor R4, the gate of the PMOS transistor V2 is connected with the cathode of the diode D2 through the resistor R5, the source of the PMOS transistor V2 is connected with a common anode power supply contact COM + of a circuit breaker, the drain of the PMOS transistor V2 is connected with the cathode of the diode D1, and the resistor R3 and the capacitor C2 are connected in parallel between the gate and the source of the PMOS transistor V2.

When the cost control signal output contacts FK _ L and FK _ N of the electric energy meter have no voltage, the resistor R1 is not conducted with the input loop of the optocoupler U1, so that the optocoupler U1 has no output. At this time, the gate voltage of the PMOS transistor V1 is forcibly clamped by the diode D1 to almost coincide with the breaker control closing input contact HZ-. Therefore, the grid voltage of the PMOS tube V1 is lower than the source voltage and reaches the PMOS tube opening voltage threshold, the PMOS tube V1 is conducted, so that a common anode power supply contact COM + of the breaker and a breaker control opening input contact FZ-form a loop, the breaker receives an opening control signal, and the breaker realizes opening action and keeps for a long time.

Due to the conduction of the PMOS tube V1, the voltage of the common anode power supply contact COM + of the circuit breaker is the same as that of the control opening input contact FZ-of the circuit breaker. Therefore, even if the resistors R3 and R5 form a signal loop, the grid electrode voltage of the PMOS tube V2 is the same as the source electrode voltage, the PMOS tube V2 cannot reach the opening voltage threshold of the PMOS tube, the PMOS tube V2 is turned off, the breaker control closing input contact HZ & lt- & gt is low, and the breaker does not close. At the moment, the closing and opening control signals of the circuit breaker form an interlocking relation.

When the cost control signal output contacts FK _ L and FK _ N of the electric energy meter have voltage, the resistor R1 is conducted with the input loop of the optocoupler U1, and the output of the optocoupler U1 is conducted. At this time, the gate and the source of the PMOS transistor V1 are electrically connected through the resistor R1, and the voltage difference is not enough to turn on the PMOS transistor V1. Therefore, the breaker controls the opening input contact FZ-signal to be low, and the breaker is not in the opening state. Meanwhile, because the voltage signal of the breaker control opening input contact FZ-is low, in a path formed by the resistor R3 and the resistor R5, the voltage difference between the control electrode and the source electrode of the PMOS tube V2 is enough to conduct the PMOS tube V2, so that the voltage of the common anode power supply contact COM + signal of the breaker is consistent with the voltage signal of the breaker control closing input contact HZ-and the breaker is closed.

To ensure that when the resistors R1 and R4 and the diodes D1 and D2 form a path, the voltage difference between the gate and the source of the PMOS transistor V1 cannot turn on the switching transistor, the resistance of the resistor R4 is much larger than that of the resistor R1, which is usually 100 to 1000 times larger than that of the resistor R1.

To ensure that when the resistors R3 and R5 form a path, the voltage difference between the gate and the source of the PMOS transistor V2 can turn on the PMOS transistor V2, the difference between the resistance of the resistor R5 and the resistance of the resistor R3 should be small, which is usually 1 to 10 times.

Because the charge control signal of the electric energy meter is an alternating current signal, the signal changes according to the period, and in order to ensure the level stability of the control signals of the PMOS tubes V1 and V2, capacitors are connected in parallel between the source electrodes and the grid electrodes of the PMOS tubes V1 and V2 for filtering, so that the control signals are stable.

Because the electric energy meter cost control signal current is minimum, generally is less than 200uA, and the drive optocoupler capacity is extremely weak, the output drive capacity of the optocoupler is weak, so that the circuit can work under the extremely low power consumption. The current transmission ratio of the optical coupler should be large, preferably 300% to 600%. The resistances of the resistors R4 and R3 should be large, preferably in the megaohm range.

The embodiment of the utility model can carry out sequence adjustment, combination and deletion according to actual needs.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and those modifications and variations assumed in the above are also considered to be within the protective scope of the present invention.

Claims

1. A charge control circuit breaker is with positive pole signal conversion circuit altogether which characterized in that:

the device is composed of an optocoupler U1, a PMOS tube V1, a PMOS tube V2, a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1 and a capacitor C2;

the anode of the optical coupler U1 is connected with an electric energy meter cost control signal output contact FK _ L through the resistor R2, the cathode of the optical coupler U1 is connected with an electric energy meter cost control signal output contact FK _ N, the collector of the optical coupler U1 is connected with the source of the PMOS tube V1 through the resistor R1, the grid of the PMOS tube V1 is connected with the emitter of the optical coupler U1, the source of the PMOS tube V1 is connected with a breaker common anode power supply contact COM +, the drain of the PMOS tube V1 is connected with the cathode of the diode D2, two ends of the capacitor C1 are respectively connected with the source and the grid of the PMOS tube V1, the cathode of the diode D1 is connected with a breaker control closing input contact HZ-, the anode of the diode D1 is connected with the emitter of the optical coupler U1 through the resistor R4, and the cathode of the diode D2 is connected with a breaker control opening input contact FZ-, the anode of the diode D2 is connected with the emitter of the optocoupler U1 through the resistor R4, the gate of the PMOS transistor V2 is connected with the cathode of the diode D2 through the resistor R5, the source of the PMOS transistor V2 is connected with a common anode power supply contact COM + of a circuit breaker, the drain of the PMOS transistor V2 is connected with the cathode of the diode D1, and the resistor R3 and the capacitor C2 are connected in parallel between the gate and the source of the PMOS transistor V2.

2. A common anode signal converting circuit for a fiscal circuit breaker as claimed in claim 1, characterized in that: the current transmission ratio of the optical coupler U1 is 300-600%.

3. A common anode signal converting circuit for a fiscal circuit breaker as claimed in claim 1, characterized in that: the ratio of the resistance value of the resistor R4 to the resistance value of the resistor R1 is 100 times to 1000 times.

4. A common anode signal converting circuit for a fiscal circuit breaker as claimed in claim 1, characterized in that: the ratio of the resistance value of the resistor R5 to the resistance value of the resistor R3 is 1-10 times.

5. A common anode signal converting circuit for a fiscal circuit breaker as claimed in claim 1, characterized in that: the resistance values of the resistor R4 and the resistor R3 are megaohms.