Electric energy meter power load switch driving circuit and method

Abstract

The invention discloses a power load switch driving circuit of an electric energy meter. The power load switch driving circuit comprises a step-down rectifying circuit, a voltage stabilizing circuit, an energy storage circuit, an MOS tube switching circuit and a booster circuit, one end of the step-down rectifying circuit is connected with the mains supply, the other end of the step-down rectifying circuit is electrically connected with the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is electrically connected with the MOS tube switching circuit, the energy storage circuit and the output control circuit, and the MOS tube switching circuit is electrically connected with the booster circuit. The invention further discloses an electric energy meter power load switch driving method. The technical problems that an existing driving circuit cannot perform reliable action of a load switch and is complex in structure are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy meters, and particularly to a driving circuit and method for a power load switch of an electric energy meter. Background Art

[0002] The current measurement range of the new standard electric energy meter is expanded to 150A. To improve measurement safety, the new standard electric energy meter puts forward clear requirements for the technical requirements of the built-in load switch, especially the electrical clearance between the moving contact and the static contact of the built-in switch, which is clearly required to be not less than 5.5mm; when designing the electric energy meter, a high-power load switch is used to turn on or off. The new technology standard of the State Grid requires that the gap after the contact is disconnected reaches 5.5mm, resulting in the transient drive power of the load switch reaching more than 10W; the conventional single-phase electric energy meter uses a power frequency transformer for power supply design, and the output power is generally within 4W, and it cannot reliably operate the load switch within the allowable working voltage range of the electric energy meter; the contact electrical clearance of the existing load switch is about 1mm. After the contact gap is increased to 5.5mm, the drive power required by the load switch increases significantly, and the transient drive power reaches more than 15W. Therefore, due to the limitation of power output, especially when the input voltage is low, the step-down and voltage-stabilizing power supply scheme of the conventional power frequency transformer cannot drive the 5.5mm load switch anymore, and the power supply circuit needs to be redesigned. To solve the driving problem of the 5.5mm interval load switch, most design schemes adopt the switching power supply method, and the switching power supply stably outputs a driving voltage of about 12V. The switching power supply has a large output power and a wide working range, but at the same time, because there are more devices added and the circuit is complex, the reliability of the whole meter decreases. Among them, the added materials are mainly plug-in devices. Due to the compact space and dense devices inside the meter, the processability of the whole meter is poor and the cost increases significantly. Therefore, it is urgent to propose a driving circuit and method for a power load switch of an electric energy meter to solve the technical problems that the existing driving circuit cannot reliably operate the load switch and the structure is complex. Summary of the Invention

[0003] The main object of the present invention is to propose a driving circuit and method for a power load switch of an electric energy meter, aiming to solve the technical problems that the existing driving circuit cannot reliably operate the load switch and the structure is complex.

[0004] To achieve the above object, the present invention provides a driving circuit for a power load switch of an electric energy meter, wherein the driving circuit for a power load switch of an electric energy meter includes:

[0005] A step-down rectification circuit, a voltage stabilization circuit, an energy storage circuit, a MOS transistor switch circuit, and a boost circuit;

[0006] One end of the step-down rectifier circuit is connected to the mains power supply, and the other end of the step-down rectifier circuit is electrically connected to the voltage stabilizing circuit. The output end of the voltage stabilizing circuit is electrically connected to the MOS transistor switch circuit, the energy storage circuit, and the output control circuit respectively. The MOS transistor switch circuit is electrically connected to the boost circuit.

[0007] One of the preferred solutions is that the step-down rectifier circuit includes a transformer T1 and a rectifier bridge B1. The 1st and 3rd pins of the transformer T1 are connected to the live wire and the neutral wire of the mains power supply respectively. The 4th and 5th pins of the transformer are connected to the rectifier bridge B1. The rectifier bridge B1 is connected to the ground terminal and the voltage stabilizing circuit respectively.

[0008] One of the preferred solutions is that the rectifier bridge B1 includes a diode D3, a diode D4, a diode D5, and a diode D6. The anode of the diode D3 is connected to the ground terminal and the anode of the diode D4 respectively. The cathode of the diode D3 is connected to the 4th pin of the transformer T1 and the anode of the diode D5 respectively. The cathode of the diode D5 is connected to the voltage stabilizing circuit and the cathode of the diode D6 respectively. The anode of the diode D6 is connected to the 5th pin of the transformer T1 and the cathode of the diode D4 respectively.

[0009] One of the preferred solutions is that the voltage stabilizing circuit includes a voltage regulator U1, a capacitor C1, an inductor L1, a resistor R2, a resistor R3, a capacitor C2, a resistor R1, and a capacitor EC1. The 1st pin of the voltage regulator U1 is connected to the capacitor C1. The other end of the capacitor C1 is connected to the inductor L1 and the 6th pin of the voltage regulator U1 respectively. The other end of the inductor L1 is connected to the resistor R2, the capacitor C2, the MOS transistor switch circuit, the energy storage circuit, and the output control circuit respectively. The other end of the resistor R2 is connected to the resistor R3 and the 3rd pin of the voltage regulator U1 respectively. The 4th pin of the voltage regulator U1 is connected to the resistor R1. The other end of the resistor R1 is connected to the 5th pin of the voltage regulator U1, the capacitor EC1, and the step-down rectifier circuit respectively. The 2nd pin of the voltage regulator U1, the capacitor EC1, the resistor R3, and the other end of the capacitor C2 are grounded.

[0010] One of the preferred solutions is that the MOS transistor switch circuit includes a MOS transistor Q1, a triode Q2, and a resistor R4. The source electrode of the MOS transistor Q1 is connected to the energy storage circuit and the output control circuit respectively. The drain electrode of the MOS transistor Q1 is connected to the boost circuit. The gate electrode of the MOS transistor Q1 is connected to the collector electrode of the triode Q2. The base electrode of the triode Q2 is connected to the resistor R4. The other end of the resistor R4 is connected to the voltage stabilizing circuit. The emitter electrode of the triode Q2 is grounded.

[0011] One of the preferred solutions is that the energy storage circuit includes supercapacitor C3 and supercapacitor C4; one end of the supercapacitor C4 is connected to the output control circuit, the other end of the supercapacitor C4 is connected to the supercapacitor C3, and the other end of the supercapacitor C3 is grounded.

[0012] One of the preferred solutions is that the discharge time of the energy storage circuit is:

[0013]

[0014] where t is the discharge time of the supercapacitor in the energy storage circuit, C is the equivalent capacitance of the series connection of supercapacitor C3 and supercapacitor C3, V work is the voltage across the supercapacitor after being fully charged, V min is the acceptable remaining voltage across the supercapacitor after the supercapacitor discharge completes the relay drive, and I is the maximum current when the relay operates.

[0015] One of the preferred solutions is that the boost circuit includes BOOST boost chip U2, inductor L2, resistor R5, resistor R6 and capacitor C6; the 1-pin of the BOOST boost chip U2 is connected to the inductor L2, and the other end of the inductor L2 is respectively connected to the 3-pin, 6-pin of the BOOST boost chip U2 and the MOS transistor switch circuit, the 4-pin of the BOOST boost chip U2 is respectively connected to the resistor R5 and the resistor R6, the other end of the resistor R6 is respectively connected to the capacitor C6 and the 5-pin of the BOOST boost chip U2, and the 2-pin of the BOOST boost chip U2, the other ends of the resistor R5 and the capacitor C6 are grounded.

[0016] One of the preferred solutions is that the output control circuit includes capacitor C5, double diode D1, resistor R1, double diode D2 and battery socket; one end of the capacitor C5 is respectively connected to the voltage regulation circuit, the MOS transistor switch circuit and the 1-pin, 2-pin of the double diode D1, the other end of the capacitor C5 is grounded, the 3-pin of the double diode D1 is respectively connected to the resistor R1 and the 1-pin of the double diode D2, the other end of the resistor R1 is respectively connected to the energy storage circuit and the MOS transistor switch circuit, the 2-pin of the double diode D2 is connected to the 1-pin of the battery socket, the 2-pin of the battery socket is grounded, and the 3-pin of the double diode D2 is connected to an external device.

[0017] A driving method for an electric energy meter power load switch driving circuit including the described one includes the following steps:

[0018] The input mains power is stepped down and rectified by a step-down rectifier circuit to output a DC power supply. The output voltage is stored through an energy storage circuit. When the relay performs a switching operation, the energy stored in the supercapacitor is boosted to the driving voltage of the relay through a boost circuit, realizing the short-time drive of the load switch of the electricity meter.

[0019] In the above technical solution of the present invention, the driving circuit of the power load switch of the electricity meter includes: a step-down rectifier circuit, a voltage stabilizing circuit, an energy storage circuit, a MOS transistor switch circuit, and a boost circuit; one end of the step-down rectifier circuit is connected to the mains power, and the other end of the step-down rectifier circuit is electrically connected to the voltage stabilizing circuit. The output end of the voltage stabilizing circuit is respectively electrically connected to the MOS transistor switch circuit, the energy storage circuit, and the output control circuit, and the MOS transistor switch circuit is electrically connected to the boost circuit. The present invention solves the technical problems that the existing driving circuit cannot perform reliable operation of the load switch and has a complex structure.

[0020] In the present invention, taking advantage of the characteristic that the load switch in the electricity meter only needs short-time drive, the supercapacitor of the energy storage circuit stores capacitance. Using a high-current BOOST boost chip, the voltage of the supercapacitor is boosted to the normal driving voltage of the relay, thereby effectively driving the power load switch to work short-time to meet the requirement of driving the load switch of the electricity meter, and at the same time, the output driving power is stable.

[0021] In the present invention, by setting an output control circuit, the control output of three power supply modes, namely mains power supply, supercapacitor power supply, and battery power supply, is realized.

[0022] In the present invention, a MOS transistor switch circuit is arranged between the energy storage circuit and the boost circuit. When the MOS transistor is powered on, it conducts. After power-off, the MOS transistor switch disconnects the boost circuit to prevent the charge stored in the supercapacitor from being consumed in the low-power state. Brief Description of the Drawings

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0024] Figure 1 It is the first schematic diagram of a driving circuit for the power load switch of an electricity meter according to an embodiment of the present invention;

[0025] Figure 2 It is the second schematic diagram of a driving circuit for the power load switch of an electricity meter according to an embodiment of the present invention;

[0026] Figure 3 This is the third schematic diagram of a power load switch driving circuit for an electric energy meter according to an embodiment of the present invention.

[0027] The realization of the object of the present invention, its functional features and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific Embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down,...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, descriptions such as "first" and "second" in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0031] Moreover, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Refer to Figures 1-3 , according to one aspect of the present invention, the present invention provides a power load switch driving circuit for an electric energy meter, wherein the power load switch driving circuit for an electric energy meter includes:

[0033] A step-down rectification circuit, a voltage stabilization circuit, an energy storage circuit, a MOS transistor switch circuit, and a boost circuit;

[0034] One end of the step-down rectification circuit is connected to the mains power supply, the other end of the step-down rectification circuit is electrically connected to the voltage stabilization circuit, the output end of the voltage stabilization circuit is respectively electrically connected to the MOS transistor switch circuit, the energy storage circuit, and the output control circuit, and the MOS transistor switch circuit is electrically connected to the boost circuit.

[0035] Specifically, in this embodiment, the step-down rectifier circuit includes a transformer T1 and a rectifier bridge B1; the 1st and 3rd pins of the transformer T1 are respectively connected to the live wire and the neutral wire of the mains power supply, the 4th and 5th pins of the transformer are connected to the rectifier bridge B1, and the rectifier bridge B1 is respectively connected to the ground terminal and the voltage stabilizing circuit.

[0036] Specifically, in this embodiment, the rectifier bridge B1 includes diodes D3, D4, D5, and D6; the anode of diode D3 is respectively connected to the ground terminal and the anode of diode D4, the cathode of diode D3 is respectively connected to the 4th pin of the transformer T1 and the anode of diode D5, the cathode of diode D5 is respectively connected to the voltage stabilizing circuit and the cathode of diode D6, and the anode of diode D6 is respectively connected to the 5th pin of the transformer T1 and the cathode of diode D4; the rectifier bridge B1 converts the alternating current signal output by the transformer T1 into a pulsating direct current signal.

[0037] Specifically, in this embodiment, the voltage stabilizing circuit includes a voltage regulator U1, a capacitor C1, an inductor L1, a resistor R2, a resistor R3, a capacitor C2, a resistor R1, and a capacitor EC1; the 1st pin of the voltage regulator U1 is connected to the capacitor C1, the other end of the capacitor C1 is respectively connected to the inductor L1 and the 6th pin of the voltage regulator U1, the other end of the inductor L1 is respectively connected to the resistor R2, the capacitor C2, the MOS transistor switching circuit, the energy storage circuit, and the output control circuit, the other end of the resistor R2 is respectively connected to the resistor R3 and the 3rd pin of the voltage regulator U1, the 4th pin of the voltage regulator U1 is connected to the resistor R1, the other end of the resistor R1 is respectively connected to the 5th pin of the voltage regulator U1, the capacitor EC1, and the step-down rectifier circuit, and the 2nd pin of the voltage regulator U1, the capacitor EC1, the resistor R3, and the other end of the capacitor C2 are grounded; the voltage stabilizing circuit stabilizes the output voltage to ensure that the output voltage remains unchanged when the input voltage fluctuates or the load changes.

[0038] Specifically, in this embodiment, the MOS transistor switching circuit includes a MOS transistor Q1, a triode Q2, and a resistor R4; the source of the MOS transistor Q1 is respectively connected to the energy storage circuit and the output control circuit, the drain of the MOS transistor Q1 is connected to the boost circuit, the gate of the MOS transistor Q1 is connected to the collector of the triode Q2, the base of the triode Q2 is connected to the resistor R4, the other end of the resistor R4 is connected to the voltage stabilizing circuit, and the emitter of the triode Q2 is grounded.

[0039] Specifically, in this embodiment, the energy storage circuit includes supercapacitor C3 and supercapacitor C4; one end of supercapacitor C4 is connected to the output control circuit, the other end of supercapacitor C4 is connected to supercapacitor C3, and the other end of supercapacitor C3 is grounded; the driving characteristic of the power load switch is that the driving current is large, and the transient current can reach 1.5 A. The output capacity of the power frequency transformer of the electric energy meter cannot drive it normally. Especially when the input voltage is low, analyzing the driving characteristic of the power load switch, although the short-time driving current is very large, the actual driving time is relatively short, and it can reliably operate only in 30 - 50 ms. Therefore, through the characteristic that the supercapacitor can discharge with a large transient current, the present invention uses supercapacitor C4 and supercapacitor C3 connected in series to boost and stabilize the voltage at both ends, realizes the short-time output of a large current, releases the stored charge in a short time, and stabilizes to about 12 V through the BOOST high-current boost circuit, thereby realizing the short-time drive of the power load switch.

[0040] Specifically, in this embodiment, after the supercapacitor is fully charged, the discharge time of the energy storage circuit is:

[0041]

[0042] where t is the discharge time of the supercapacitor in the energy storage circuit, C is the equivalent capacitance of supercapacitor C3 and supercapacitor C3 connected in series, V work is the voltage across the supercapacitor after being fully charged, V min is the acceptable remaining voltage across the supercapacitor after the relay drive is completed during discharge, and I is the maximum current during the relay operation;

[0043] If the equivalent capacitance of supercapacitor C3 and supercapacitor C3 connected in series is 1.5 F, V work after being fully charged is 5 V, and the discharge voltage V min after tripping is 4 V, according to the above calculation formula, if the discharge current is 5 A, the discharge time is 200 ms; when the efficiency of the boost circuit is 80%, after boosting from 5 V to 12 V, the driving power that can be output within 200 ms is 20 W, which can meet the driving requirements of most power load switches in the magnetic latching mode; although the supercapacitor voltage fluctuates greatly, the output driving power is stable.

[0044] Specifically, in this embodiment, the boost circuit includes a BOOST boost chip U2, an inductor L2, a resistor R5, a resistor R6, and a capacitor C6; the 1-pin of the BOOST boost chip U2 is connected to the inductor L2, and the other end of the inductor L2 is respectively connected to the 3-pin and 6-pin of the BOOST boost chip U2 and the MOS transistor switch circuit. The 4-pin of the BOOST boost chip U2 is respectively connected to the resistor R5 and the resistor R6. The other end of the resistor R6 is respectively connected to the capacitor C6 and the 5-pin of the BOOST boost chip U2. The 2-pin of the BOOST boost chip U2, the other ends of the resistor R5 and the capacitor C6 are grounded. The present invention uses a power BOOST boost circuit to boost the voltage and current, boost and regulate the energy stored in the supercapacitor. The voltages across the supercapacitors C3 and C4 in the energy storage circuit vary between 1.5V and 5.5V, and the output voltage can be adjusted from 11V to 15V, realizing a short-time output of a large current.

[0045] Specifically, in this embodiment, the output control circuit includes a capacitor C5, a double diode D1, a resistor R1, a double diode D2, and a battery socket; one end of the capacitor C5 is respectively connected to the voltage stabilization circuit, the MOS transistor switch circuit, and the 1-pin and 2-pin of the double diode D1. The other end of the capacitor C5 is grounded. The 3-pin of the double diode D1 is respectively connected to the resistor R1 and the 1-pin of the double diode D2. The other end of the resistor R1 is respectively connected to the energy storage circuit and the MOS transistor switch circuit. The 2-pin of the double diode D2 is connected to the 1-pin of the battery socket. The 2-pin of the battery socket is grounded. The 3-pin of the double diode D2 is connected to an external device; the battery socket can be connected to an external battery.

[0046] Specifically, in this embodiment, the input mains power is stepped down and rectified by the step-down rectifier circuit of the power frequency transformer, and the energy is stored through the super capacitor. When the power relay needs to be switched on or off, the power-type BOOST boost circuit is used to boost the energy stored in the super capacitor to the driving voltage of the relay, so as to realize the driving of the power relay. Before the relay is driven, the low-voltage energy is stored by the super capacitor. The charging range of the super capacitor is 3 - 6V. When the power relay is driven, the energy of the super capacitor is released in a short time, so as to reach the driving power of the relay. The boost circuit is used to boost the voltage and current. The driving time range is less than 200ms, and the actual effective driving time is about 50ms. In the present invention, not only can the super capacitor on the existing electric energy meter be directly used to realize short-time power output, which significantly reduces the storage cost of driving energy; 3 can also use an independent super capacitor to realize short-time power output. When using the super capacitor on the existing electric energy meter to realize short-time power output, the MOS tube switch terminal of the MOS tube switch circuit will be used to boost the circuit after power failure to prevent the charge stored in the super capacitor from being consumed in the low-power state. When using an independent super capacitor, the MOS tube switch circuit does not need to be used to disconnect the boost circuit, and the discharge range of the super capacitor is wider. The circuit devices of the present invention are all small-size and low-voltage devices, which occupy less space in the electric energy meter, and the electric energy meter has high reliability and low cost.

[0047] According to another aspect of the present invention, the present invention provides a driving method for a power load switch of an electric energy meter. Wherein, the driving method for the power load switch of the electric energy meter includes the following steps:

[0048] The mains power is input, and the mains power is stepped down and rectified through the step-down rectifier circuit to output a DC power supply voltage, which is stored through the energy storage circuit. When the relay performs the switching on or off operation, the energy stored in the super capacitor is boosted to the driving voltage of the relay through the boost circuit to realize the short-time driving of the load switch of the electric energy meter. The driving characteristic of the power load switch is that the driving current is large, and the transient current can reach 1.5A. The output capacity of the ordinary power frequency transformer of the electric energy meter cannot drive it normally. Especially when the input voltage is low, analyzing the driving characteristic of the power load switch, although the short-time driving current is large, the actual driving time is relatively short, and it can reliably operate only in 30 - 50 milliseconds. Therefore, by using the characteristic that the super capacitor can discharge a large transient current, the charge stored in the super capacitor is released in a short time, and the voltage is stabilized to about 12V by the boost circuit, so as to realize the short-time driving of the power load switch.

[0049] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A driving circuit for a power load switch of an electric energy meter, characterized in that, Including: A step-down rectifier circuit, a voltage regulator circuit, an energy storage circuit, a MOS transistor switch circuit, and a boost circuit; One end of the step-down rectifier circuit is connected to the mains power supply, the other end of the step-down rectifier circuit is electrically connected to the voltage regulator circuit, the output end of the voltage regulator circuit is respectively electrically connected to the MOS transistor switch circuit, the energy storage circuit, and the output control circuit, and the MOS transistor switch circuit is electrically connected to the boost circuit.

2. The power load switch driving circuit of an electric energy meter according to claim 1, wherein The step-down rectifier circuit includes a transformer T1 and a rectifier bridge B1; the 1st and 3rd pins of the transformer T1 are respectively connected to the live wire and the neutral wire of the mains power supply, the 4th and 5th pins of the transformer are connected to the rectifier bridge B1, and the rectifier bridge B1 is respectively connected to the ground terminal and the voltage regulator circuit.

3. The power load switch driving circuit of an electric energy meter according to claim 2, characterized in that The rectifier bridge B1 includes diodes D3, D4, D5, and D6; the anode of the diode D3 is respectively connected to the ground terminal and the anode of the diode D4, the cathode of the diode D3 is respectively connected to the 4th pin of the transformer T1 and the anode of the diode D5, the cathode of the diode D5 is respectively connected to the voltage regulator circuit and the cathode of the diode D6, and the anode of the diode D6 is respectively connected to the 5th pin of the transformer T1 and the cathode of the diode D4.

4. A driving circuit for an electric energy meter power load switch according to any one of claims 1-3, characterized in that, The voltage regulator circuit includes a voltage regulator U1, a capacitor C1, an inductor L1, resistors R2, R3, a capacitor C2, a resistor R1, and a capacitor EC1; the 1st pin of the voltage regulator U1 is connected to the capacitor C1, the other end of the capacitor C1 is respectively connected to the inductor L1 and the 6th pin of the voltage regulator U1, the other end of the inductor L1 is respectively connected to the resistor R2, the capacitor C2, the MOS transistor switch circuit, the energy storage circuit, and the output control circuit, the other end of the resistor R2 is respectively connected to the resistor R3 and the 3rd pin of the voltage regulator U1, the 4th pin of the voltage regulator U1 is connected to the resistor R1, the other end of the resistor R1 is respectively connected to the 5th pin of the voltage regulator U1, the capacitor EC1, and the step-down rectifier circuit, and the 2nd pin of the voltage regulator U1, the capacitor EC1, the resistor R3, and the other end of the capacitor C2 are grounded.

5. A driving circuit for an electric energy meter power load switch according to any one of claims 1-3, characterized in that The MOS transistor switch circuit includes a MOS transistor Q1, a triode Q2, and a resistor R4; the source electrode of the MOS transistor Q1 is respectively connected to the energy storage circuit and the output control circuit, the drain electrode of the MOS transistor Q1 is connected to the boost circuit, the gate electrode of the MOS transistor Q1 is connected to the collector electrode of the triode Q2, the base electrode of the triode Q2 is connected to the resistor R4, the other end of the resistor R4 is connected to the voltage regulator circuit, and the emitter electrode of the triode Q2 is grounded.

6. A driving circuit for an electric energy meter power load switch according to any one of claims 1-3, characterized in that The energy storage circuit includes supercapacitors C3 and C4; one end of the supercapacitor C4 is connected to the output control circuit, the other end of the supercapacitor C4 is connected to the supercapacitor C3, and the other end of the supercapacitor C3 is grounded.

7. The driving circuit of the power load switch of the electric energy meter according to claim 6, characterized in that, The discharge time of the energy storage circuit is: Among them, t is the discharge time of the supercapacitor in the energy storage circuit, C is the equivalent capacitance of the series connection of supercapacitor C3 and supercapacitor C3, V work is the voltage across the supercapacitor after it is fully charged, V min is the acceptable remaining voltage across the supercapacitor after the discharge is completed for relay driving, and I is the maximum current when the relay operates.

8. A driving circuit for an electric energy meter power load switch according to any one of claims 1 to 3, characterized in that The boost circuit includes a BOOST boost chip U2, an inductor L2, a resistor R5, a resistor R6, and a capacitor C6; the 1-pin of the BOOST boost chip U2 is connected to the inductor L2, and the other end of the inductor L2 is respectively connected to the 3-pin and 6-pin of the BOOST boost chip U2 and the MOS transistor switch circuit. The 4-pin of the BOOST boost chip U2 is respectively connected to the resistor R5 and the resistor R6. The other end of the resistor R6 is respectively connected to the capacitor C6 and the 5-pin of the BOOST boost chip U2. The 2-pin of the BOOST boost chip U2, the other ends of the resistor R5 and the capacitor C6 are grounded.

9. A driving circuit for an electric energy meter power load switch according to any one of claims 1-3, characterized in that, The output control circuit includes a capacitor C5, a double diode D1, a resistor R1, a double diode D2, and a battery socket; one end of the capacitor C5 is respectively connected to the voltage stabilization circuit, the MOS transistor switch circuit, and the 1-pin and 2-pin of the double diode D1. The other end of the capacitor C5 is grounded. The 3-pin of the double diode D1 is respectively connected to the resistor R1 and the 1-pin of the double diode D2. The other end of the resistor R1 is respectively connected to the energy storage circuit and the MOS transistor switch circuit. The 2-pin of the double diode D2 is connected to the 1-pin of the battery socket. The 2-pin of the battery socket is grounded. The 3-pin of the double diode D2 is connected to an external device.

10. A driving method for a driving circuit of an electric energy meter power load switch, comprising the driving circuit according to any one of claims 1-9, characterized in that, It includes the following steps: Input the commercial power, step down and rectify the commercial power through a step-down rectification circuit to output a DC power supply, store it through an energy storage circuit. When the relay performs a switching operation, boost the energy stored in the super capacitor to the driving voltage of the relay through a boost circuit to achieve short-time driving of the load switch of the electric energy meter.

Images