CN212517041U - Switching circuit for ammeter - Google Patents

Abstract

The utility model relates to an ammeter draws closing brake circuit, include and link to each other with the relay and be used for controlling the drawing closing brake module that the relay opened and shut, link to each other with drawing closing brake module and for the power module of drawing closing brake module power supply, its characterized in that: the energy storage module is connected between the switching-on/switching-off module and the power supply module and is charged by the power supply module, and the energy storage module supplies power to the switching-on/switching-off module at the switching-on/switching-off moment. The circuit layout is flexible, the cost is low, and the circuit stability is good.

Description

Switching circuit for ammeter

Technical Field

The utility model relates to an ammeter technical field especially relates to an ammeter draws closing circuit.

Background

The electric meter is generally provided with a switching-on/off function, which is usually realized by driving a relay to act through a switching-on/off circuit. Generally, the switching time is short, generally within 100ms, and the driving power at the moment of switching on and switching off is large, so that a large electric energy is needed, and in order to provide the large electric energy at the moment of switching on and switching off, the method in the prior art is to increase the power of the switching on and switching off power supply circuit, which may cause the following disadvantages: after the power is increased, the cost is increased; meanwhile, after the power is increased, the number of elements is increased, the size is increased, and a larger PCB area is required to be occupied.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, an object of the present invention is to provide an electric meter switching circuit that can provide a large driving power and has a stable circuit, and simultaneously save the area of the PCB board and is favorable for saving the cost.

In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides an ammeter switching on and off circuit, includes the switching on and off module that links to each other and be used for controlling the relay to open and shut, links to each other and for the power module of switching on and off module power supply with the switching on and off module, its characterized in that:

the energy storage module is connected between the switching-on/switching-off module and the power supply module and is charged by the power supply module, and the energy storage module supplies power to the switching-on/switching-off module at the switching-on/switching-off moment.

Furthermore, the energy storage module comprises a first capacitor, one end of the first capacitor is connected between the power supply module and the switching module, and the other end of the first capacitor is grounded.

Furthermore, the switching-on/switching-off circuit further comprises a backflow prevention diode and a current limiting resistor, wherein the anode of the backflow prevention diode is connected with the power supply module, the cathode of the backflow prevention diode is connected with one end of the current limiting resistor, the other end of the current limiting resistor is connected with the switching-on/switching-off module, and one end of the first capacitor is connected with the other end of the current limiting resistor.

Furthermore, the power supply module comprises a first control chip and a feedback module connected with the first control chip, and the feedback module acquires an output signal of the first control chip and feeds the acquired signal back to the first control chip.

Further, the output signal is an output voltage.

Further, the feedback module comprises a voltage division network formed by a first resistor and a second resistor, and a feedback receiving end of the first control chip is connected between the first resistor and the second resistor.

Furthermore, the power supply module further comprises a first filter capacitor connected to the input end of the first control chip and a second filter capacitor connected to the output end of the first control chip.

Furthermore, the switching module includes a second control chip and a TVS tube connected to an output end of the second control chip.

Furthermore, the switching module further comprises a third filter capacitor connected to the input end of the second control chip.

Compared with the prior art, the utility model has the advantages of:

the energy storage module is arranged between the switching-on/off module and the power supply module, so that the power supply module can not only supply power but also use the energy of the energy storage module when switching-on/off, thereby meeting the requirement that a switching-on/off circuit needs larger instantaneous electric energy, simultaneously not influencing a power supply and ensuring the stability of the circuit; and the increase of the energy storage module is compared with the improvement of the previous circuit, the cost is lower, the circuit is convenient and practical, and the space of the PCB is also saved.

Drawings

Fig. 1 is a block diagram of a switching circuit in the present application.

Fig. 2 is a circuit diagram of a switching circuit according to the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1 to 2, the switching circuit for an electricity meter includes a switching module 3 connected to a relay 4 and used for controlling the switching of the relay 4, a power supply module 1 connected to the switching module 3 and used for supplying power to the switching module 3, and an energy storage module 2 connected between the switching module 3 and the power supply module 1 and charged by the power supply module 1, where the energy storage module 2 supplies power to the switching module 3 at the moment of switching. In the normal course of work of ammeter, power module 1 charges for energy storage module 2, and be the power supply of switching on and off module 3 by energy storage module 2 and power module 1 jointly in the switching on and off in the twinkling of an eye, make relay 4 carry out the switching on and off operation, thereby overcome in the past only by power module for the switching on and off operation power supply, and the switching on and off is great in drive power in the twinkling of an eye, need great electric energy, lead to whole supply circuit unstable, if improve switching on and off supply circuit power, lead to circuit components to increase, PCB board circuit is bulky, problem with high costs, convenience and practicality.

As a preferred embodiment, the energy storage module 2 includes a first capacitor C4, one end of the first capacitor C4 is connected between the power supply module 1 and the switching module 3, and the other end is grounded.

In order to ensure that the circuit operates safely and stably, as shown in fig. 2, the switching circuit further includes a backflow prevention diode VD1 and a current limiting resistor R6, the positive electrode of the backflow prevention diode VD1 is connected to the power supply module 1, the negative electrode of the backflow prevention diode VD1 is connected to one end of the current limiting resistor R6, the other end of the current limiting resistor R6 is connected to the switching module 3, and the one end of the first capacitor C4 is connected to the other end of the current limiting resistor R6.

In order to stabilize the output voltage of the power supply module 1, as shown in fig. 2, the power supply module 1 includes a first control chip N1 and a feedback module 11 connected to the first control chip N1, and the feedback module 11 collects an output signal of the first control chip N1 and feeds back the collected signal to the first control chip N1. Specifically, the output signal is an output voltage; the feedback module 11 includes a voltage divider network formed by a first resistor R3 and a second resistor R4, and a feedback receiving terminal FB of the first control chip N1 is connected between the first resistor R3 and the second resistor R4. As shown in the figure, Power _ in + and Power _ in-are input voltages, and the input voltages are processed by the first control chip N1 and then output to the back-end circuit through the output port of the Power supply module 1, and are connected to the anode of the anti-backflow diode VD 1.

In order to filter out noise, the power supply module 1 further includes a first filter capacitor C1 connected to the input terminal VIN of the first control chip N1, and a second filter capacitor C3 connected to the output terminal of the first control chip N1.

In this embodiment, as shown in fig. 2, the switching module 3 includes a second control chip N2 and a TVS transistor connected to the output terminals OA and OB of the second control chip N2, and the induced voltage generated by switching the relay 4 can be suppressed by setting the TVS transistor, so that the whole circuit is more stable. In this embodiment, the switching module 3 further includes a third filter capacitor C5 connected to the input terminal VIN of the second control chip N2. As shown in fig. 2, Control a and Control B are signals from the controller, Relay _ Control _ a and Relay _ Control _ B are output signals for controlling the Relay, when Control a is high level and Control B is low level, the second Control chip N2 controls Relay _ Control _ a to be high and Relay _ Control _ B to be low, and the Relay 4 is attracted; whereas the relay 4 is open.

It should be noted that the switching circuit further includes some other devices, such as an inductor L1 in the power supply module, and the details are not described herein since the device is not within the scope of the present application.

While embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides an ammeter switching on and off circuit, includes switching on and off module (3) that link to each other and be used for controlling relay (4) to open and shut with relay (4), links to each other and for power module (1) of switching on and off module (3) power supply with switching on and off module (3), its characterized in that:

the energy storage module (2) is connected between the switching-on/switching-off module (3) and the power supply module (1) and charged by the power supply module (1), and the energy storage module (2) supplies power to the switching-on/switching-off module (3) at the moment of switching-on/switching-off.

2. An electric meter switching circuit as defined in claim 1, wherein:

the energy storage module (2) comprises a first capacitor, one end of the first capacitor is connected between the power supply module (1) and the switching module (3), and the other end of the first capacitor is grounded.

3. An electric meter switching circuit as defined in claim 2, wherein:

the switching-on/switching-off circuit further comprises a backflow prevention diode and a current-limiting resistor, wherein the positive electrode of the backflow prevention diode is connected with the power supply module (1), the negative electrode of the backflow prevention diode is connected with one end of the current-limiting resistor, the other end of the current-limiting resistor is connected with the switching-on/switching-off module (3), and one end of the first capacitor is connected with the other end of the current-limiting resistor.

4. An electric meter switching circuit as defined in claim 1, wherein:

the power supply module (1) comprises a first control chip and a feedback module (11) connected with the first control chip, wherein the feedback module (11) collects output signals of the first control chip and feeds the collected signals back to the first control chip.

5. An electric meter switching circuit as defined in claim 4, wherein:

the output signal is an output voltage.

6. An electric meter switching circuit as defined in claim 4, wherein:

the feedback module (11) comprises a voltage division network formed by a first resistor and a second resistor, and the feedback receiving end of the first control chip is connected between the first resistor and the second resistor.

7. The ammeter switching circuit of claim 6, wherein:

the power supply module (1) further comprises a first filter capacitor connected to the input end of the first control chip and a second filter capacitor connected to the output end of the first control chip.

8. An electric meter switching circuit as defined in claim 1, wherein:

and the switching module (3) comprises a second control chip and a TVS tube connected with the output end of the second control chip.

9. An electric meter switching circuit as defined in claim 7, wherein:

and the switching module (3) comprises a second control chip and a TVS tube connected with the output end of the second control chip.

10. An electric meter switching circuit according to claim 8 or 9, characterized in that:

the switching-on/switching-off module (3) further comprises a third filter capacitor connected to the input end of the second control chip.

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