Constant voltage circuit for electricity meter

Abstract

The utility model discloses a constant voltage circuit for an electric meter. One end of a primary coil of the transformer T1 is connected with a voltage HV, the other end of the primary coil of the transformer T1 is connected with the main control unit, and a secondary coil of the transformer T1 supplies energy to an output end; the positive electrode of the light-emitting end of the optocoupler U2 is connected with the output end of the secondary coil, the negative electrode is grounded, the emitting electrode is grounded, and the collecting electrode is connected with the collecting end of the main control unit; the main control unit collects the voltage of the output end of the transformer T1 through the collection end, the output end of the main control unit is further connected with a control coil of the transformer T1, and signals are sent to the transformer T1 according to the collected voltage so as to carry out constant-voltage output. The voltage of the output end enables the light-emitting end to be switched on or switched off, so that the voltage of an acquisition pin of the main control unit is changed through the optocoupler, the main control unit recognizes the voltage of the current output end, and then a signal is sent to the transformer to change the current output voltage.

Description

Technical Field

[0001] The utility model relates to the field of electric meters, in particular to a constant voltage circuit for an electric meter. Background Art

[0002] The smart electric meter is one of the basic devices for data acquisition in the smart grid (especially the smart distribution network). It undertakes the tasks of collecting, measuring, and transmitting the original electric energy data, and is the basis for realizing information integration, analysis optimization, and information display. In addition to the basic power consumption measurement function of traditional electric meters, the smart electric meter also has intelligent functions such as two-way multi-rate measurement function, user-side control function, two-way data communication function with multiple data transmission modes, and anti-stealing electricity function to adapt to the smart grid and the use of new energy. However, the existing electric meters have low energy efficiency and high power consumption. Content of the Utility Model

[0003] To solve the above problems, this technical solution provides a constant voltage circuit for an electric meter.

[0004] To achieve the above purpose, the technical solution is as follows:

[0005] A constant voltage circuit for an electric meter includes:

[0006] A rectification unit BD1, which outputs a voltage HV after receiving the commercial power.

[0007] A transformer T1, one end of the primary coil of which is connected to the voltage HV, the other end is connected to the main control unit, and the secondary coil supplies energy to the output end.

[0008] An optocoupler U2, the positive pole of the light-emitting end of which is connected to the output end of the secondary coil, the negative pole is grounded, the emitter is grounded, and the collector is connected to the acquisition end of the main control unit.

[0009] A main control unit, which acquires the voltage at the output end of the transformer T1 through the acquisition end. The output end of the main control unit is also connected to the control coil of the transformer T1, and sends a signal to the transformer T1 according to the acquired voltage for constant voltage output.

[0010] In some embodiments, the other end of the primary coil of the transformer T1 is sequentially connected with a diode D1 and a resistor R2, and the resistor R2 is respectively connected to the voltage HV through a resistor R1 and a capacitor C1.

[0011] In some embodiments, one end of the control coil is connected to the main control unit through a resistor R4, and this end is also sequentially grounded through a resistor R7 and a diode D2, and the other end of the control coil is grounded.

[0012] In some embodiments, a capacitor EC2, a capacitor C5, and a resistor R13 are sequentially provided between both ends of the secondary coil. One end of the secondary coil is connected to the positive electrode of the light-emitting end through a resistor R9. The negative electrode of the light-emitting end is connected to one end of a reference unit U3. The other end of the reference unit U3 is grounded. The control end of the reference unit U3 is connected to one end of the secondary coil through a resistor R10.

[0013] In some embodiments, the resistor R10 is further connected to the negative electrode of the light-emitting end through a capacitor C4 and a resistor R12 in sequence.

[0014] The beneficial effects of this application are as follows:

[0015] This application collects the voltage magnitude of the output end through the light-emitting end of the optocoupler. The voltage magnitude of the output end causes the light-emitting end to conduct or cut off, so that the voltage of the acquisition pin of the main control unit changes through the optocoupler, enabling the main control unit to recognize the current output end voltage magnitude. Then, a signal is sent to the transformer to change the current output voltage, enabling the transformer to output a constant voltage, thereby achieving higher energy efficiency and greatly reducing losses. It is applicable to an 80 - 305V output, and can reach below 0.1W in the standby state, supporting an environment of 70 degrees. Moreover, this application uses PIN-type contact, making replacement easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments.

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the technical problems, technical solutions, and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0019] Please refer to Figure 1 as shown, a constant voltage circuit for an electric meter includes:

[0020] A rectification unit BD1, which outputs a voltage HV after receiving the commercial power.

[0021] A transformer T1, one end of its primary coil is connected to the voltage HV, the other end is connected to the main control unit, and its secondary coil supplies energy to the output end.

[0022] An optocoupler U2, the positive electrode of its light-emitting end is connected to the output end of the secondary coil, the negative electrode is grounded, its emitter is grounded, and the collector is connected to the acquisition end of the main control unit;

[0023] The main control unit collects the output voltage of the transformer T1 through the acquisition terminal, and the output terminal of the main control unit is also connected to the control coil of the transformer T1, and sends a signal to the transformer T1 according to the collected voltage for constant voltage output.

[0024] In this application, the magnitude of the voltage at the output terminal is collected through the light-emitting end of the optocoupler. The magnitude of the voltage at the output terminal causes the light-emitting end to conduct or cut off, so that the voltage of the acquisition pin of the main control unit changes through the optocoupler, enabling the main control unit to recognize the magnitude of the current output terminal voltage, and then sending a signal to the transformer to change the current output voltage, enabling the transformer to output a constant voltage, thus having higher energy efficiency and greatly reduced losses. It is applicable to an 80 - 305V output, and can reach below 0.1W in the standby state, supporting an environment of 70 degrees. Furthermore, in this application, PIN-type contact is used, making replacement easier.

[0025] In some embodiments, the other end of the primary coil of the transformer T1 is sequentially connected to a diode D1 and a resistor R2, and the resistor R2 is connected to the voltage HV through a resistor R1 and a capacitor C1 respectively.

[0026] In some embodiments, one end of the control coil is connected to the main control unit through a resistor R4, and this end is also grounded sequentially through a resistor R7 and a diode D2, and the other end of the control coil is grounded.

[0027] In some embodiments, a capacitor EC2, a capacitor C5, and a resistor R13 are sequentially arranged between the two ends of the secondary coil. One end of the secondary coil is connected to the positive electrode of the light-emitting end through a resistor R9, the negative electrode of the light-emitting end is connected to one end of the reference unit U3, the other end of the reference unit U3 is grounded, and the control end of the reference unit U3 is connected to one end of the secondary coil through a resistor R10.

[0028] In some embodiments, the resistor R10 is also sequentially connected to the negative electrode of the light-emitting end through a capacitor C4 and a resistor R12.

[0029] The above are only the preferred embodiments of this application, and are not used to limit the scope of implementation of this application. All others whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A constant voltage circuit for an electric meter, characterized in that, including; A rectifying unit BD1 that outputs a voltage HV after receiving the mains power; A transformer T1, one end of its primary coil is connected to the voltage HV, the other end is connected to the main control unit, and its secondary coil supplies energy to the output end; An optocoupler U2, the positive pole of its light-emitting end is connected to the output end of the secondary coil, the negative pole is grounded, its emitter is grounded, and the collector is connected to the acquisition end of the main control unit; A main control unit that acquires the output voltage of the transformer T1 through the acquisition end, and the output end of the main control unit is also connected to the control coil of the transformer T1, and sends a signal to the transformer T1 according to the acquired voltage for constant voltage output.

2. The constant voltage circuit for an electric meter according to claim 1, characterized in that: The other end of the primary coil of the transformer T1 is sequentially connected with a diode D1 and a resistor R2, and the resistor R2 is respectively connected to the voltage HV through a resistor R1 and a capacitor C1.

3. The constant voltage circuit for an ammeter according to claim 2, characterized in that: One end of the control coil is connected to the main control unit through a resistor R4, this end is also sequentially grounded through a resistor R7 and a diode D2, and the other end of the control coil is grounded.

4. The constant voltage circuit for an ammeter according to claim 3, characterized in that: A capacitor EC2, a capacitor C5 and a resistor R13 are sequentially arranged between the two ends of the secondary coil. One end of the secondary coil is connected to the positive pole of the light-emitting end through a resistor R9. The negative pole of the light-emitting end is connected to one end of a reference unit U3, the other end of the reference unit U3 is grounded, and the control end of the reference unit U3 is connected to one end of the secondary coil through a resistor R10.

5. The constant voltage circuit for an ammeter according to claim 4, characterized in that: The resistor R10 is also sequentially connected to the negative pole of the light-emitting end through a capacitor C4 and a resistor R12.

Images