A resistor-capacitor half-wave doubling non-isolated power supply circuit and an electric energy meter

Abstract

The utility model provides a kind of resistance-capacitance half-wave doubling non-isolated power supply circuit and electric energy meter, resistance-capacitance half-wave doubling non-isolated power supply circuit includes resistance-capacitance step-down half-wave module, doubling module and voltage stabilizing module, among them, the input end of resistance-capacitance step-down half-wave module is electrically connected with power supply, and the input end of doubling module is electrically connected with output end;The input end of doubling module is electrically connected with voltage stabilizing module's output end output voltage;The output end of voltage stabilizing module exports voltage;Resistance-capacitance step-down half-wave module is used for resistance-capacitance step-down and overvoltage protection;Doubling module is used to realize the multiplication of input current;Voltage stabilizing module is used for voltage stabilizing and overvoltage protection;Thus, the compactness of each module design of this circuit, simple structure, small size make that circuit integration is good, with stronger anti-interference ability, lower power consumption and efficient energy conversion.

Description

Technical Field

[0001] This application relates to the field of electricity meter technology, and in particular to a resistor-capacitor half-wave current doubling non-isolated power supply circuit and an electricity meter. Background Technology

[0002] In existing technologies, traditional single-phase energy meters typically use linear power supplies or switching power supplies as their power supply schemes. These two power supply schemes have played an important role in past single-phase energy meter applications, meeting certain usage requirements. However, linear power supplies generally suffer from low efficiency and large size. For example, linear power supplies mainly rely on linear regulators for voltage conversion, which generate a large amount of heat during the voltage conversion process, resulting in low overall efficiency. To ensure the normal operation of the linear regulator, heat sinks and other heat dissipation devices must be equipped to dissipate the large amount of heat generated, making the overall size of linear power supplies typically large.

[0003] Switching power supplies are relatively complex to design. In addition, their internal switching elements perform high-frequency switching operations, which generate high-frequency noise. This high-frequency noise can interfere with other electronic devices through electromagnetic radiation or conduction, leading to measurement errors or equipment failures. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a resistor-capacitor half-wave current doubling non-isolated power supply circuit and an energy meter.

[0005] In a first aspect, this application provides a resistor-capacitor half-wave current-doubling non-isolated power supply circuit, including a resistor-capacitor step-down half-wave module, a current-doubling module, and a voltage regulator module.

[0006] The RC step-down half-wave module is used for RC step-down and overvoltage protection;

[0007] The current multiplier module is used to multiply the input current;

[0008] The voltage regulator module is used for voltage regulation and overvoltage protection;

[0009] The input terminal of the RC step-down half-wave module is electrically connected to the power supply, and the output terminal is electrically connected to the input terminal of the current multiplier module; the output terminal of the current multiplier module is electrically connected to the input terminal of the voltage regulator module; the output terminal of the voltage regulator module outputs voltage.

[0010] In some embodiments of this application, the RC buck half-wave module includes resistor RN1, resistor RN3 and capacitor CN1;

[0011] One end of resistor RN1 and one end of resistor RN3 are connected to UN. The other end of resistor RN1 is connected to one end of capacitor CN1. The other end of capacitor CN1 is connected to the current multiplier module. The other end of resistor RN3 is grounded.

[0012] In some embodiments of this application, the current multiplier module includes diodes DN1, DN2, DN3, and DN4, resistor RN2, transistor QN1, and capacitor EN1;

[0013] Specifically, the anode of diode DN1, the cathode of diode DN2, and one end of resistor RN2 are all connected to the RC buck half-wave module; the cathode of diode DN1 is connected to MHVDD; the anode of diode DN2 is connected to the cathode of capacitor EN1; the other end of resistor RN2 is connected to the base of transistor QN1; the emitter of transistor QN1 is connected to the cathode of capacitor EN1, and the collector of transistor QN1 is grounded; the anodes of diode DN3 and DN4 are both connected to the anode of capacitor EN1; the cathode of diode DN3 is connected to MHVDD; and the anode of diode DN4 is grounded.

[0014] In some embodiments of this application, the voltage regulator module includes a Zener diode DN5, a capacitor CN2, a capacitor CN3, and a capacitor EN2;

[0015] The negative terminal of the Zener diode DN5, one end of the capacitor CN2, one end of the capacitor CN3, and the positive terminal of the capacitor EN2 are all connected to MHVDD; the positive terminal of the Zener diode DN5, the other end of the capacitor CN2, the other end of the capacitor CN3, and the negative terminal of the capacitor EN2 are all grounded.

[0016] In some embodiments of this application, the resistor RN1 is a wire-wound resistor; the resistor RN3 is a varistor.

[0017] In some embodiments of this application, the capacitor CN1 is a safety capacitor.

[0018] In some embodiments of this application, the Zener diode DN5 is of model SMB2Z24A.

[0019] In some embodiments of this application, capacitors CN2 and CN3 are ceramic capacitors.

[0020] In some embodiments of this application, the capacitor EN2 is an electrolytic capacitor.

[0021] A second aspect of this application provides an energy meter including the aforementioned RC half-wave current doubling non-isolated power supply circuit.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects: The RC half-wave current multiplier non-isolated power supply circuit of this application includes an RC step-down half-wave module, a current multiplier module, and a voltage regulator module. The input terminal of the RC step-down half-wave module is electrically connected to the power supply, and the output terminal is electrically connected to the input terminal of the current multiplier module. The output terminal of the current multiplier module is electrically connected to the input terminal of the voltage regulator module. The output terminal of the voltage regulator module outputs a voltage. Thus, the circuit modules are compactly designed, have a simple structure, and are small in size, resulting in good circuit integration, strong anti-interference capability, low power consumption, and efficient energy conversion.

[0023] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0024] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of an exemplary embodiment of the present application of a resistor-capacitor half-wave current-doubling non-isolated power supply circuit.

[0026] Figure 2 This is a circuit diagram of an exemplary embodiment of the present application of a resistor-capacitor half-wave current-doubling non-isolated power supply circuit;

[0027] Figure 3 This is a schematic diagram of the working principle of an electricity meter provided in an exemplary embodiment of this application. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0029] In existing technologies, traditional single-phase energy meters typically use linear power supplies or switching power supplies as their power supply schemes. These two power supply schemes have played an important role in past single-phase energy meter applications, meeting certain usage requirements. However, linear power supplies generally suffer from low efficiency and large size. For example, linear power supplies mainly rely on linear regulators for voltage conversion, which generate a large amount of heat during the voltage conversion process, resulting in low overall efficiency. To ensure the normal operation of the linear regulator, heat sinks and other heat dissipation devices must be equipped to dissipate the large amount of heat generated, making the overall size of linear power supplies typically large.

[0030] Switching power supplies are relatively complex to design. In addition, their internal switching elements perform high-frequency switching operations, which generate high-frequency noise. This high-frequency noise can interfere with other electronic devices through electromagnetic radiation or conduction, leading to measurement errors or equipment failures.

[0031] Based on this, an exemplary embodiment of this application provides a resistor-capacitor (RC) half-wave current multiplier non-isolated power supply circuit. The circuit includes an RC step-down half-wave module, a current multiplier module, and a voltage regulator module. The input terminal of the RC step-down half-wave module is electrically connected to the power supply, and the output terminal is electrically connected to the input terminal of the current multiplier module. The output terminal of the current multiplier module is electrically connected to the input terminal of the voltage regulator module. The output terminal of the voltage regulator module outputs a voltage. Thus, the circuit modules are compactly designed, have a simple structure, and are small in size, resulting in good circuit integration, strong anti-interference capability, low power consumption, and efficient energy conversion.

[0032] Example 1:

[0033] An exemplary embodiment of this application provides a resistor-capacitor half-wave current-doubling non-isolated power supply circuit, such as... Figure 1 As shown, the circuit includes a RC step-down half-wave module, a current multiplier module, and a voltage regulator module. The RC step-down half-wave module is used for RC step-down and overvoltage protection; the current multiplier module multiplies the input current; and the voltage regulator module regulates the voltage and provides overvoltage protection. The input terminal of the RC step-down half-wave module is electrically connected to the power supply, and its output terminal is electrically connected to the input terminal of the current multiplier module. The output terminal of the current multiplier module is electrically connected to the input terminal of the voltage regulator module. The output terminal of the voltage regulator module outputs the voltage. The compact design of each module in this circuit results in good circuit integration, strong anti-interference capability, low power consumption, and efficient energy conversion.

[0034] like Figure 2As shown, the RC step-down half-wave module includes resistors RN1 and RN3, and capacitor CN1. One end of resistor RN1 and one end of resistor RN3 are connected to UN, and the other end of resistor RN1 is connected to one end of capacitor CN1. The other end of capacitor CN1 is connected to the current multiplier module, and the other end of resistor RN3 is grounded. Preferably, resistor RN3 is a varistor, whose main functions are overvoltage protection, surge suppression, electrostatic discharge protection, and improving circuit stability; resistor RN1 is a wire-wound resistor; and capacitor CN1 is a safety capacitor. Resistor RN1 and capacitor CN1 together provide RC step-down functionality. The capacitive reactance of safety capacitor CN1 is Xc = 1 / 2πfC = 1 / (2*3.14*50*0.00000033) = 9650Ω.

[0035] Continue to refer to Figure 2 The current multiplier module includes diodes DN1, DN2, DN3, and DN4, resistor RN2, transistor QN1, and capacitor EN1. The anode of diode DN1, the cathode of diode DN2, and one end of resistor RN2 are connected to the RC step-down half-wave module. The cathode of diode DN1 is connected to MHVDD. The anode of diode DN2 is connected to the cathode of capacitor EN1. The other end of resistor RN2 is connected to the base of transistor QN1. The emitter of transistor QN1 is connected to the cathode of capacitor EN1, and the collector of transistor QN1 is grounded. The anodes of diodes DN3 and DN4 are connected to the anode of capacitor EN1. The cathode of diode DN3 is connected to MHVDD. The anode of diode DN4 is grounded. Preferably, capacitor EN1 is an electrolytic capacitor.

[0036] When GND is positive and UN is negative, capacitor EN1 is charged. The current flow in the circuit is from GND to diode DN4 to capacitor EN1 to diode DN2 to capacitor CN1 to resistor RN1 to UN. When GND is negative and UN is positive, capacitor EN1 discharges. At this time, the current in the circuit is twice the original current. The current flow in the circuit is from UN to resistor RN1 to capacitor CN1 to diode DN1 to MHVDD; capacitor EN1 to diode DN3 to MHVDD; UN to resistor RN1 to capacitor CN1 to resistor RN2. Transistor QN1 conducts. The conduction of transistor CE allows the negative terminal of capacitor EN1 to be grounded. In this way, the current is multiplied.

[0037] The voltage regulator module includes a Zener diode DN5, capacitors CN2 and CN3, and capacitor EN2. The negative terminal of Zener diode DN5, one end of capacitor CN2, one end of capacitor CN3, and the positive terminal of capacitor EN2 are all connected to MHVDD. The positive terminal of Zener diode DN5, the other end of capacitor CN2, the other end of capacitor CN3, and the negative terminal of capacitor EN2 are all grounded.

[0038] The Zener diode DN5 provides overvoltage protection. When the voltage in the circuit exceeds a certain safety threshold, the Zener diode DN5 enters the breakdown region and conducts, transferring the excess voltage across itself, thus protecting other sensitive components from damage. Preferably, the Zener diode DN5 is model SMB2Z24A, and the rectified voltage MHVDD is regulated to approximately 24V. Capacitors CN2 and CN3 are ceramic capacitors; capacitor EN2 is an electrolytic capacitor; capacitors CN2, CN3, and EN2 serve as filters and store energy.

[0039] Example 2:

[0040] An exemplary embodiment of this application provides an electricity meter that includes the resistor-capacitor half-wave current-doubling non-isolated power supply circuit described in Embodiment 1 above, such as... Figure 3 As shown, the electricity meter uses this power supply current to power the system, enabling the electricity meter to work normally.

[0041] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0042] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0043] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A resistor-capacitor half-wave current-doubling non-isolated power supply circuit, characterized in that, This includes resistor-capacitor step-down half-wave modules, current multiplier modules, and voltage regulator modules; The RC step-down half-wave module is used for RC step-down and overvoltage protection; The current multiplier module is used to multiply the input current; The voltage regulator module is used for voltage regulation and overvoltage protection; The input terminal of the RC step-down half-wave module is electrically connected to the power supply, and the output terminal is electrically connected to the input terminal of the current multiplier module; the output terminal of the current multiplier module is electrically connected to the input terminal of the voltage regulator module; the output terminal of the voltage regulator module outputs voltage.

2. The RC half-wave current doubling non-isolated power supply circuit according to claim 1, characterized in that, The RC step-down half-wave module includes resistor RN1, resistor RN3 and capacitor CN1; One end of resistor RN1 and one end of resistor RN3 are connected to UN; the other end of resistor RN1 is connected to one end of capacitor CN1; the other end of capacitor CN1 is connected to the current multiplier module. The other end of the resistor RN3 is grounded.

3. The RC half-wave current doubling non-isolated power supply circuit according to claim 1, characterized in that, The current multiplier module includes diodes DN1, DN2, DN3, and DN4, resistor RN2, transistor QN1, and capacitor EN1; Specifically, the anode of diode DN1, the cathode of diode DN2, and one end of resistor RN2 are all connected to the RC buck half-wave module; the cathode of diode DN1 is connected to MHVDD; the anode of diode DN2 is connected to the cathode of capacitor EN1; the other end of resistor RN2 is connected to the base of transistor QN1; the emitter of transistor QN1 is connected to the cathode of capacitor EN1, and the collector of transistor QN1 is grounded; the anodes of diode DN3 and DN4 are both connected to the anode of capacitor EN1; the cathode of diode DN3 is connected to MHVDD; and the anode of diode DN4 is grounded.

4. The RC half-wave current doubling non-isolated power supply circuit according to claim 1, characterized in that, The voltage regulator module includes a Zener diode DN5, a capacitor CN2, a capacitor CN3, and a capacitor EN2; The negative terminal of the Zener diode DN5, one end of the capacitor CN2, one end of the capacitor CN3, and the positive terminal of the capacitor EN2 are all connected to MHVDD; the positive terminal of the Zener diode DN5, the other end of the capacitor CN2, the other end of the capacitor CN3, and the negative terminal of the capacitor EN2 are all grounded.

5. The RC half-wave current doubling non-isolated power supply circuit according to claim 2, characterized in that, The resistor RN1 is a wire-wound resistor; the resistor RN3 is a varistor.

6. The RC half-wave current doubling non-isolated power supply circuit according to claim 2, characterized in that, The capacitor CN1 is a safety capacitor.

7. The RC half-wave current doubling non-isolated power supply circuit according to claim 4, characterized in that, The Zener diode DN5 is model SMB2Z24A.

8. The RC half-wave current doubling non-isolated power supply circuit according to claim 4, characterized in that, The capacitors CN2 and CN3 are ceramic capacitors.

9. The RC half-wave current doubling non-isolated power supply circuit according to claim 4, characterized in that, The capacitor EN2 is an electrolytic capacitor.

10. An electricity meter, characterized in that, Including the RC half-wave current doubling non-isolated power supply circuit as described in any one of claims 1 to 9.

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