CN110858751A - Power supply structure of electric energy meter and electric energy meter - Google Patents
Power supply structure of electric energy meter and electric energy meter Download PDFInfo
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- CN110858751A CN110858751A CN201810964325.XA CN201810964325A CN110858751A CN 110858751 A CN110858751 A CN 110858751A CN 201810964325 A CN201810964325 A CN 201810964325A CN 110858751 A CN110858751 A CN 110858751A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a power supply structure of an electric energy meter and the electric energy meter, which are applied to a three-phase electric energy meter power supply; the power supply structure of the electric energy meter comprises: the power conversion module is electrically connected with the feedback control module; when the power conversion module is in a high-voltage input state, the power conversion module distributes high voltage in a preset voltage distribution mode to stabilize the electric energy meter; the preset voltage distribution mode comprises fixed distribution voltage and variable distribution voltage; under the states of low-voltage input and high load, the feedback control module forms and outputs a feedback signal to the power conversion module so as to conduct the power conversion module; and then, along with the slow increase of the output voltage of the power conversion module, the output voltage of the power conversion module is set through the feedback control module, and a feedback signal is continuously formed so as to ensure the low-voltage slow start of the power supply structure of the electric energy meter. The power supply structure of the electric energy meter and the electric energy meter provided by the invention can meet the requirements of different national working voltage ranges around the world.
Description
Technical Field
The invention belongs to the technical field of power supply circuits, relates to a power supply structure, and particularly relates to a power supply structure of an electric energy meter and the electric energy meter.
Background
The rated working voltage of the existing three-phase electric energy meter power supply only supports 1 × 57.7V or only supports 3 × 220V, and only supports a voltage fluctuation range of ± 20%.
Only single rated voltage range to export overseas's electric energy meter, in order to adapt to different national voltage range demands, need customize different power supply schemes, still need simultaneously to the electric energy meter of different operating voltage ranges, send respectively to authoritative testing agency and authenticate to owing to customize the product to different operating voltage ranges, choose different components and parts for use, in order to guarantee product reliability, need put into a large amount of designs and test resources and verify.
Therefore, how to provide a power supply structure of an electric energy meter and the electric energy meter to solve the defects that the existing electric energy meter cannot meet the differentiated requirements of customers in different countries and the like becomes a technical problem to be solved urgently by technical staff in the field.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a power supply structure of an electric energy meter and an electric energy meter, which are used to solve the problem that the existing electric energy meter cannot meet the differentiated requirements of customers in different countries.
In order to achieve the above and other related objects, the present invention provides, in one aspect, a power supply structure of an electric energy meter, which is applied to a three-phase electric energy meter power supply; the power supply structure of the electric energy meter comprises: the power conversion module is electrically connected with the feedback control module; when the power conversion module is in a high-voltage input state, the power conversion module distributes high voltage in a preset voltage distribution mode to stabilize the electric energy meter; the preset voltage distribution mode comprises fixed distribution voltage and variable distribution voltage; under the conditions of low-voltage input and high load, the feedback control module forms and outputs a feedback signal to the power conversion module so as to conduct the power conversion module; and then, along with the slow increase of the output voltage of the power conversion module, setting the output voltage of the power conversion module through the feedback control module, and continuously forming the feedback signal so as to ensure the low-voltage slow start of the power supply structure of the electric energy meter.
In an embodiment of the present invention, the power structure of the electric energy meter further includes: the power supply module is used for supplying power in a single phase under the low-voltage input state; or in a high-voltage input state, three-phase power supply.
In an embodiment of the present invention, the power structure of the electric energy meter further includes: and the rectification filtering module is connected with the output end of the power supply module and is used for rectifying and filtering the current output by the power supply module.
In an embodiment of the present invention, the rectifying and filtering module includes three first voltage dependent resistors, three second voltage dependent resistors, and three third voltage dependent resistors, four groups of diode assemblies respectively connected to three phase lines and one zero line and connected in parallel, a first inductor and a second inductor connected to the first diode assembly, and a first capacitor and an energy storage assembly bridged between the first inductor and the second inductor; the diode component includes a first diode, a second diode, …, a fifteenth diode, and a sixteenth diode.
In an embodiment of the invention, the energy storage device includes a first electrolytic capacitor, a second electrolytic capacitor, a third electrolytic capacitor, a fourth electrolytic capacitor, a fifth electrolytic capacitor, a sixth electrolytic capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor; the first electrolytic capacitor, the third electrolytic capacitor and the fifth electrolytic capacitor are connected in series, the second electrolytic capacitor and the fourth electrolytic capacitor are connected in series with the sixth electrolytic capacitor, and the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor and the ninth resistor are connected in series; the first electrolytic capacitor, the second electrolytic capacitor and the first resistor, the second resistor and the third resistor which are connected in series are connected in parallel; the third electrolytic capacitor and the fourth electrolytic capacitor are connected in parallel with a fourth resistor, a fifth resistor and a sixth resistor which are connected in series; the fifth electrolytic capacitor, the sixth electrolytic capacitor, the seventh resistor, the eighth resistor and the ninth resistor are connected in series and are connected in parallel.
In an embodiment of the invention, the power conversion module includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a second capacitor, a seventeenth diode, an eighteenth diode, a nineteenth diode, a first transient diode, a second transient diode, a third transient diode, a second capacitor, a third capacitor, a fourth capacitor, a seventh electrolytic capacitor, an eighth electrolytic capacitor, a switching power supply chip, a field effect transistor, a first voltage regulator diode and a transformer; the tenth resistor, the eleventh resistor, the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the fifteenth resistor, the first transient diode, the second transient diode and the third transient diode are connected in series; the sixteenth resistor is connected with the second capacitor in parallel, and the sixteenth resistor is connected with the seventeenth resistor in series; the drain electrode of the field effect transistor is connected with the anode of a seventeenth diode, the cathode of the seventeenth diode is connected with the anode of an eighteenth diode, and the cathode of the eighteenth diode is connected with one end of a seventeenth resistor; the first voltage stabilizing diode is bridged between the source electrode of the field effect transistor and the grid electrode, the negative electrode of the first voltage stabilizing diode is connected with one end of an eighteenth resistor, and the other end of the eighteenth resistor is connected between the fourteenth resistor and the fifteenth resistor; the switching power supply chip is provided with 12 ports, wherein a second port is connected with one end of a nineteenth resistor, the other end of the nineteenth resistor is grounded, a third port and a fourth port are connected with one end of a third capacitor, the other end of the third capacitor is grounded, a twentieth resistor and a seventh electrolytic capacitor are connected in series, and the twentieth resistor and the seventh electrolytic capacitor are connected in parallel with the third capacitor; the transformer is provided with 8 connecting ends, wherein the first connecting end is grounded, the second connecting end is connected with the anode of a nineteenth diode, the cathode of the nineteenth diode is connected with one end of a fourth capacitor, the other end of the fourth capacitor is grounded, and the fourth capacitor is connected with the eighth electrolytic capacitor and the twenty-first resistor in parallel.
In an embodiment of the invention, the tenth resistor, the eleventh resistor, the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the fifteenth resistor, the first transient diode, the second transient diode, and the third transient diode form a fixed distribution voltage network to fixedly distribute the voltage to the switching power chip and to variably distribute the voltage to the field effect transistor, so as to adapt the electric energy meter to a high voltage.
In an embodiment of the present invention, the feedback control module includes a feedback optocoupler, a parallel voltage regulator chip, a twentieth diode, a twenty-first diode, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a ninth electrolytic capacitor, and a tenth electrolytic capacitor; the feedback optocoupler is provided with 4 ports, and the parallel voltage stabilizing chip is provided with 3 ports; a first port of the feedback optocoupler is connected between the twenty-fourth resistor and the twenty-fifth resistor, a second port of the feedback optocoupler is connected with the anode of a twentieth diode, the cathode of the twentieth diode is connected with one end of a ninth electrolytic capacitor, the ninth electrolytic capacitor is grounded, a third port of the feedback optocoupler is connected with the twentieth resistor, and a fourth port of the feedback optocoupler is connected with the twenty-first resistor; a twenty-second resistor, a fifth capacitor and a twenty-first diode which are connected in series are connected in parallel, and a twenty-second diode and a twenty-third resistor are connected in parallel; a twenty-fourth diode is connected with the twenty-fifth resistor in series, and then connected with a twenty-seventh resistor, a twenty-eighth resistor and a twenty-ninth resistor in parallel respectively; a sixth capacitor and a twenty-sixth resistor which are connected in series are bridged between the first port and the second port of the parallel voltage stabilizing chip, and the third port is grounded;
in an embodiment of the present invention, the twenty-third resistor, the twentieth diode, the twenty-second diode and the ninth electrolytic capacitor form a low-voltage soft start unit; in the process that the voltage at the output end of the power conversion module is slowly increased, the ninth electrolytic capacitor is charged through a twenty-third resistor, and the voltage at the output end of the power conversion module can also be charged through a twenty-fourth resistor, a feedback optocoupler built-in diode and a twentieth diode; when the voltage of the output end of the power conversion module is in a low-voltage state, a built-in diode of a feedback optocoupler is conducted to generate a feedback signal to the switching power supply chip so as to ensure the normal work of the switching power supply chip; and along with the gradual increase of the secondary output voltage of the power conversion module, the voltage value is set by the parallel voltage stabilization chip and the feedback signal is generated to ensure the low-voltage stable start of the power supply structure of the electric energy meter.
In an embodiment of the invention, the twenty-second diode assists the ninth electrolytic capacitor to discharge the stored electric quantity when the power supply structure of the electric energy meter is powered down.
In an embodiment of the present invention, the power structure of the electric energy meter further includes: and the voltage output module is electrically connected with the power conversion module and used for outputting voltage.
In an embodiment of the invention, the voltage output module includes a twenty-third diode, a thirtieth resistor, an eighth capacitor, a ninth capacitor, and an eleventh electrolytic capacitor; and after the thirtieth resistor and the eighth capacitor are connected in series, the thirtieth resistor is connected with the twenty-third diode in parallel and then connected with the eleventh electrolytic capacitor, and the eleventh electrolytic capacitor is connected with the ninth capacitor in parallel.
In a final aspect of the invention, an electric energy meter is provided, comprising a power supply structure of the electric energy meter
As described above, the power supply structure of the electric energy meter and the electric energy meter of the invention have the following beneficial effects:
the power supply structure of the electric energy meter and the electric energy meter provided by the invention can meet the requirements of different national working voltage ranges around the world, can be self-adaptive to the wide working voltage range of 1 × 57.7V-3 × 288V, reduce the types of product components, improve the reliability of the whole product machine and meet the differentiated product requirements of customers of different countries.
Drawings
Fig. 1 is a schematic diagram illustrating a schematic structure of a power supply structure of an electric energy meter according to an embodiment of the invention.
Fig. 2 is a circuit diagram of a power supply structure of an electric energy meter according to an embodiment of the invention.
Description of the element reference numerals
1 electric energy meter power supply structure
11 power supply module
12 rectification filter module
13 power conversion module
14 feedback control module
15 voltage output module
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The power supply structure of the electric energy meter and the technical principle of the electric energy meter are as follows:
the power structure of the electric energy meter and the working scheme of the electric energy meter in a low-voltage range are as follows: the signal is fed back in advance through a specific circuit, and the power supply is guaranteed to be started and operated stably in a low-voltage section.
The power structure of the electric energy meter and the working scheme of the electric energy meter in a high-voltage range are as follows: the high-voltage resistance of a new product is improved by connecting the MOSFETs in series. The voltage-dividing and stabilizing circuit limits the working voltage on the MOSFET, thereby protecting the reliable operation of the MOSFET. The working voltage on the electrolytic capacitor is limited by the series connection and the voltage division of the capacitor, so that the long-term reliable operation of the electrolytic capacitor is protected.
Example one
The embodiment provides a power supply structure of an electric energy meter, which is applied to a three-phase electric energy meter power supply; the power supply structure of the electric energy meter comprises:
the power conversion module is electrically connected with the feedback control module;
when the power conversion module is in a high-voltage input state, the power conversion module distributes high voltage in a preset voltage distribution mode to stabilize the electric energy meter; the preset voltage distribution mode comprises fixed distribution voltage and variable distribution voltage;
under the conditions of low-voltage input and high load, the feedback control module forms and outputs a feedback signal to the power conversion module so as to conduct the power conversion module; and then, along with the slow increase of the output voltage of the power conversion module, setting the output voltage of the power conversion module through the feedback control module, and continuously forming the feedback signal so as to ensure the low-voltage slow start of the power supply structure of the electric energy meter.
The power supply structure of the electric energy meter provided by the present embodiment will be described in detail with reference to the drawings. Referring to fig. 1 and fig. 2, a schematic structural diagram of a power supply structure of an electric energy meter in an embodiment and a circuit diagram of the power supply structure of the electric energy meter in an embodiment are respectively shown. As shown in fig. 1, the power supply structure 1 of the electric energy meter includes a power supply module 11, a rectifying and filtering module 12, a power conversion module 13, a feedback control module 14, and a voltage output module 15.
The power module 11 is used for supplying power in a single phase in a low-voltage input state; or in a high-voltage input state, three-phase power supply.
Specifically, in a low-voltage input state, the electric energy meter is required to be supplied with power by a form phase, the rated voltage is 90% of 57.7V, namely the voltage of 52V is required for AC input, the electric energy meter can be started stably, and the power supply can be required to be output continuously.
Under the high-voltage input state, the electric energy meter is required to be supplied with power in three phases, 110% of the rated voltage of 3 x 288V is required, namely the voltage is equivalent to 500V of single-phase AC input, the electric energy meter can stably work, namely the power supply can continuously output.
The rectifying and filtering module 12 electrically connected to the power module 11 is used for rectifying and filtering the current output by the power module. As shown in fig. 2, the rectifying and filtering module 12 includes three first voltage dependent resistors RV1, a second voltage dependent resistor RV2, and a third voltage dependent resistor RV3 connected to three phase lines (UA, UB, UC), four groups of diode assemblies connected in parallel and connected to three phase lines (UA, UB, UC) and a neutral line (UN), a first inductor L1 and a second inductor L2 connected to the first diode assembly, a first capacitor C1 connected across the first inductor L1 and the second inductor L2, and an energy storage assembly; the diode components include a first diode D1, second diodes D2, …, a fifteenth diode D15, and a sixteenth diode D16.
The first diode D1 is connected in series with the second diode D2 in reverse direction to the first diode D1 and the second diode D2, and the series connected third diode D3 and fourth diode D4 are connected in parallel.
The fifth diode D5 is connected in series with the sixth diode D6, in reverse of the fifth diode D5 and the sixth diode D6, and the series connected seventh diode D7 and the eighth diode D8 are connected in parallel.
A ninth diode D9 is connected in series with the twelfth diode D10, in reverse of the ninth diode D9 and the twelfth diode D10, and an eleventh diode D11 connected in series is connected in parallel with the twelfth diode D12.
The thirteenth diode D13 is connected in series with the fourteenth diode D14, in reverse of the thirteenth diode D13 and the fourteenth diode D14, and the series-connected fifteenth diode D15 is connected in parallel with the sixteenth diode D16.
The energy storage assembly comprises a first electrolytic capacitor C1, a second electrolytic capacitor C2, a third electrolytic capacitor C3, a fourth electrolytic capacitor C4, a fifth electrolytic capacitor C5, a sixth electrolytic capacitor C6, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9; the first electrolytic capacitor C1, the third electrolytic capacitor C3 and the fifth electrolytic capacitor C5 are connected in series, the second electrolytic capacitor C2, the fourth electrolytic capacitor C4 and the sixth electrolytic capacitor C6 are connected in series, and the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are connected in series; the first electrolytic capacitor C1, the second electrolytic capacitor C2, the first resistor R1, the second resistor R2 and the third resistor R3 which are connected in series are connected in parallel; the third electrolytic capacitor C3, the fourth electrolytic capacitor C4, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 which are connected in series are connected in parallel; the fifth electrolytic capacitor C5, the sixth electrolytic capacitor C6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are connected in parallel.
When the electric energy meter is in a high-voltage input state, the power conversion module 13 distributes high voltage in a preset voltage distribution mode to stabilize the electric energy meter; the preset voltage distribution mode comprises fixed distribution voltage and variable distribution voltage;
in a low-voltage input and high-load state, the feedback control module 14 forms and outputs a feedback signal to the power conversion module 13 to turn on the power conversion module 13; then, as the output voltage of the power conversion module 13 slowly increases, the output voltage of the power conversion module is set through the feedback control module 14, and the feedback signal is continuously formed, so as to ensure that the low-voltage slow start of the power supply structure 1 of the electric energy meter.
Specifically, the power conversion module 13 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor 19, a twentieth resistor R20, a twenty-first resistor R21, a second capacitor C2, a seventeenth diode D17, an eighteenth diode D18, a nineteenth diode D19, a first transient diode TVS1, a second transient diode TVS2, a third transient diode TVS3, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a seventh electrolytic capacitor C7, an eighth electrolytic capacitor C8, a switching power supply chip U1, a field effect transistor Q1, a first zener diode ZD 1, and a transformer T56;
the system comprises a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a first transient diode TVS1, a second transient diode TVS2 and a third transient diode TVS3 which are connected in series; the sixteenth resistor R16 and the second capacitor C2 are connected in parallel, and the sixteenth resistor R16 and the seventeenth resistor R17 are connected in series; the drain D of the field effect transistor Q1 is connected with the anode of a seventeenth diode D17, the cathode of a seventeenth diode D17 is connected with the anode of an eighteenth diode D18, and the cathode of the eighteenth diode D18 is connected with one end of a seventeenth resistor R17; the first voltage-stabilizing diode ZD is connected between the source S and the grid G of the field effect transistor Q1 in a bridge connection mode, the cathode of the first voltage-stabilizing diode ZD is connected with one end of an eighteenth resistor R18, and the other end of the eighteenth resistor R18 is connected between a fourteenth resistor R14 and a fifteenth resistor R15; the switching power supply chip U1 has 12 ports, wherein the second port is connected with one end of a nineteenth resistor R19, the other end of the nineteenth resistor R19 is grounded, the third port and the fourth port are connected with one end of a third capacitor C3, the other end of the third capacitor C3 is grounded, a twentieth resistor R20 is connected in series with a seventh electrolytic capacitor C7, and the twentieth resistor R20 and the seventh electrolytic capacitor C7 are connected in parallel with the third capacitor C3; the transformer T1 has 8 connection terminals, wherein a first connection terminal is grounded, a second connection terminal is connected to the positive terminal of a nineteenth diode D19, the negative terminal of a nineteenth diode D19 is connected to one end of a fourth capacitor C4, the other end of the fourth capacitor C4 is grounded, and the fourth capacitor C4 is connected in parallel to the eighth electrolytic capacitor C8 and the twenty-first resistor R21.
In this embodiment, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the first transient diode TVS1, the second transient diode TVS2, and the third transient diode TVS3 form a fixed distribution voltage network to distribute voltage to the switching power supply chip U1 and to distribute voltage to the field effect transistors in a variable manner, so as to adapt the power meter to high voltage.
Specifically, when high voltage is input, the series and parallel networks formed by the electrolytic capacitors C1, C2, C3, C4, C5 and C6 improve the withstand voltage capability of the electrolytic capacitors and provide stable energy storage for the switching power supply circuit. The resistors R10, R11, R12, R13, R14, R15, the transient diodes TVS1, TVS2 and TVS3 form a fixed voltage division network, fixed distribution on the switching power supply chip U1 is guaranteed, variable distribution is carried out on the MOSFET Q1, the problem that the voltage-resisting capacity of the traditional MOSFET is insufficient is solved by the voltage distribution mode, and the voltage-resisting range of the traditional MOSFET is doubled, so that the high-voltage tolerance capacity of the switching power supply is widened by the DC voltage distribution mode. Therefore, by means of the DC voltage distribution, the high voltage endurance capability of the switching power supply is widened. The voltage resistance of the currently used MOSFET can reach 1000V, and then the maximum voltage resistance of the MOSFET can reach 2000V through the circuit provided by the embodiment.
The feedback control module 14 comprises a feedback optocoupler P1, a parallel-connection type voltage-stabilizing chip U2, a twentieth diode D20, a twenty-first diode D21, a twenty-second diode D22, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a ninth electrolytic capacitor C9 and a tenth electrolytic capacitor C10; the feedback optical coupler P1 has 4 ports, and the parallel type voltage stabilizing chip U2 has 3 ports; a first port of a feedback optocoupler P1 is connected between the twenty-fourth resistor R24 and the twenty-fifth resistor R25, a second port of the feedback optocoupler P1 is connected with the anode of a twentieth diode D20, the cathode of the twentieth diode D22 is connected with one end of a ninth electrolytic capacitor C9, the ninth electrolytic capacitor C9 is grounded, a third port of the feedback optocoupler P1 is connected with the twentieth resistor R20, and a fourth port of the feedback optocoupler P1 is connected with the twenty-first resistor R21; the twenty-second resistor R22 and the fifth capacitor C5 which are connected in series are connected in parallel with a twenty-first diode D21, and a twenty-second diode D22 is connected in parallel with a twenty-third resistor R23; a twenty-fourth diode D24 is connected in series with the twenty-fifth resistor R25, and then connected in series with a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor 29, a seventh capacitor C7 and a tenth electrolytic capacitor C10 in parallel respectively; the sixth capacitor C6 and the twenty-sixth resistor R6 which are connected in series are connected between the first port and the second port of the parallel type voltage stabilizing chip U1 in a bridging mode, and the third port is grounded.
Specifically, the twenty-third resistor R23, the twentieth diode D20, the twenty-second diode D22 and the ninth electrolytic capacitor C9 constitute a low-voltage slow start unit, so as to realize stable start operation of a load in low voltage of a power supply.
The working process of the power supply structure of the electric energy meter in the low-voltage input state is as follows:
when voltage is applied to any two ends of UA, UB, UC, UN, after passing through the rectifying and filtering module 12, the switching power supply chip U1 starts to drive the MOSFET Q1 to operate, square wave output is generated at the secondary side of the transformer T1, after rectification action of the rectifier diode D21, a certain voltage is generated between the output end of the + V _ OUT2 and the output end of the GGND, and the specific output value is informed to the switching power supply chip U1 to perform on or off action through the combined action of the parallel voltage stabilizing chip U2 and the feedback optocoupler P1, so as to continuously adjust, thereby ensuring stable output. However, in the case of a low input voltage, for example, 52V ac, if the load of the secondary voltage is heavy, the output voltage rises slowly, the internal of the parallel power chip U2 cannot be turned on, the feedback optocoupler P1 cannot be turned on, the switching power chip U1 cannot input a feedback signal later, and the switching power chip U1 enters a protection state in advance and cannot continue to operate normally. This is why currently used power supplies cannot operate with a low voltage input and a heavy load output. The power supply structure of the embodiment realizes stable starting operation of low-voltage heavy load of the power supply by adding a low-voltage slow starting circuit consisting of a resistor R23, diodes D20 and D22, a ninth electrolytic capacitor C9 and the like. The specific working principle is as follows:
in the process of slowly increasing the voltage at the output end of the power conversion module 13, the ninth electrolytic capacitor C9 is charged through a twenty-third resistor R23, and the voltage at the output end of the power conversion module 13 may also be charged through a twenty-fourth resistor R24, a diode built in a feedback optocoupler P1, and a twentieth diode D20 to the ninth electrolytic capacitor C9; when the voltage at the output end of the power conversion module 13 is in a low voltage state, a diode arranged in a feedback optocoupler P1 is turned on, and a feedback signal is generated to the switching power supply chip U1, so that the switching power supply chip U1 can work normally; as the secondary output voltage of the power conversion module 11 gradually increases, the voltage value is set by the parallel voltage stabilization chip U2, and the feedback signal is generated, so as to ensure the low-voltage stable start of the power supply structure of the electric energy meter. The twenty-second diode D22 assists the ninth electrolytic capacitor C9 in discharging the stored electric quantity when the power supply structure of the electric energy meter is powered down. In this embodiment, the feedback control module 14 ensures stable start-up operation of the conventional switching power supply under the conditions of extremely low voltage and heavy load.
The voltage output module 15 electrically connected to the power conversion module 13 is used for outputting voltage.
Referring to fig. 2, the voltage output module 15 includes a twenty-third diode D23, a thirty-third resistor R30, an eighth capacitor C8, a ninth capacitor C9, and an eleventh electrolytic capacitor C11; the thirty-third resistor R30 and the eighth capacitor C8 which are connected in series are connected in parallel with the twenty-third diode D23 and then connected with the eleventh electrolytic capacitor C11, and the eleventh electrolytic capacitor C11 is connected in parallel with the ninth capacitor C9.
Example two
An electric energy meter, comprising a power supply structure of the electric energy meter according to any one of claims 1 to 12.
In conclusion, the power supply structure of the electric energy meter and the electric energy meter provided by the invention can meet the requirements of different national working voltage ranges around the world, can be self-adaptive to the wide working voltage range of 1 × 57.7V-3 × 288V, reduce the types of product components, improve the reliability of the whole product, and can meet the differentiated product requirements of customers in different countries. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (13)
1. A power supply structure of an electric energy meter is characterized in that the power supply structure is applied to a three-phase electric energy meter power supply; the power supply structure of the electric energy meter comprises:
the power conversion module is electrically connected with the feedback control module;
when the power conversion module is in a high-voltage input state, the power conversion module distributes high voltage in a preset voltage distribution mode to stabilize the electric energy meter; the preset voltage distribution mode comprises fixed distribution voltage and variable distribution voltage;
under the conditions of low-voltage input and high load, the feedback control module forms and outputs a feedback signal to the power conversion module so as to conduct the power conversion module; and then, along with the slow increase of the output voltage of the power conversion module, setting the output voltage of the power conversion module through the feedback control module, and continuously forming the feedback signal so as to ensure the low-voltage slow start of the power supply structure of the electric energy meter.
2. The power supply structure of an electric energy meter according to claim 1, characterized in that the power supply structure of an electric energy meter further comprises:
the power supply module is used for supplying power in a single phase under the low-voltage input state; or in a high-voltage input state, three-phase power supply.
3. The power supply structure of an electric energy meter according to claim 2, characterized in that the power supply structure of an electric energy meter further comprises:
and the rectification filtering module is connected with the output end of the power supply module and is used for rectifying and filtering the current output by the power supply module.
4. The power supply structure of the electric energy meter according to claim 3, wherein the rectifying and filtering module comprises three first voltage dependent resistors, a second voltage dependent resistor and a third voltage dependent resistor which are respectively connected with three phase lines, four groups of diode assemblies which are respectively connected with three phase lines and a zero line and are connected in parallel, a first inductor and a second inductor which are connected with the first diode assembly, and a first capacitor and an energy storage assembly which are bridged between the first inductor and the second inductor; the diode component includes a first diode, a second diode, …, a fifteenth diode, and a sixteenth diode.
5. The power supply structure of the electric energy meter according to claim 4, wherein the energy storage component comprises a first electrolytic capacitor, a second electrolytic capacitor, a third electrolytic capacitor, a fourth electrolytic capacitor, a fifth electrolytic capacitor, a sixth electrolytic capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor; the first electrolytic capacitor, the third electrolytic capacitor and the fifth electrolytic capacitor are connected in series, the second electrolytic capacitor and the fourth electrolytic capacitor are connected in series with the sixth electrolytic capacitor, and the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor and the ninth resistor are connected in series; the first electrolytic capacitor, the second electrolytic capacitor and the first resistor, the second resistor and the third resistor which are connected in series are connected in parallel; the third electrolytic capacitor and the fourth electrolytic capacitor are connected in parallel with a fourth resistor, a fifth resistor and a sixth resistor which are connected in series; the fifth electrolytic capacitor, the sixth electrolytic capacitor, the seventh resistor, the eighth resistor and the ninth resistor are connected in series and are connected in parallel.
6. The power supply structure of the electric energy meter according to claim 1, wherein the power conversion module comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a second capacitor, a seventeenth diode, an eighteenth diode, a nineteenth diode, a first transient diode, a second transient diode, a third transient diode, a second capacitor, a third capacitor, a fourth capacitor, a seventh electrolytic capacitor, an eighth electrolytic capacitor, a switching power supply chip, a field effect transistor, a first voltage stabilizing diode and a transformer;
the tenth resistor, the eleventh resistor, the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the fifteenth resistor, the first transient diode, the second transient diode and the third transient diode are connected in series; the sixteenth resistor is connected with the second capacitor in parallel, and the sixteenth resistor is connected with the seventeenth resistor in series; the drain electrode of the field effect transistor is connected with the anode of a seventeenth diode, the cathode of the seventeenth diode is connected with the anode of an eighteenth diode, and the cathode of the eighteenth diode is connected with one end of a seventeenth resistor; the first voltage stabilizing diode is bridged between the source electrode of the field effect transistor and the grid electrode, the negative electrode of the first voltage stabilizing diode is connected with one end of an eighteenth resistor, and the other end of the eighteenth resistor is connected between the fourteenth resistor and the fifteenth resistor; the switching power supply chip is provided with 12 ports, wherein a second port is connected with one end of a nineteenth resistor, the other end of the nineteenth resistor is grounded, a third port and a fourth port are connected with one end of a third capacitor, the other end of the third capacitor is grounded, a twentieth resistor and a seventh electrolytic capacitor are connected in series, and the twentieth resistor and the seventh electrolytic capacitor are connected in parallel with the third capacitor; the transformer is provided with 8 connecting ends, wherein the first connecting end is grounded, the second connecting end is connected with the anode of a nineteenth diode, the cathode of the nineteenth diode is connected with one end of a fourth capacitor, the other end of the fourth capacitor is grounded, and the fourth capacitor is connected with the eighth electrolytic capacitor and the twenty-first resistor in parallel.
7. The power structure of an electric energy meter according to claim 6, wherein the tenth resistor, the eleventh resistor, the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the fifteenth resistor, the first transient diode, the second transient diode and the third transient diode form a fixed distribution voltage network to fixedly distribute voltage to the switching power chip and to variably distribute voltage to the field effect transistor to adapt the electric energy meter to high voltage.
8. The power supply structure of the electric energy meter according to claim 6, wherein the feedback control module comprises a feedback optocoupler, a parallel voltage-stabilizing chip, a twentieth diode, a twenty-first diode, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a ninth electrolytic capacitor and a tenth electrolytic capacitor; the feedback optocoupler is provided with 4 ports, and the parallel voltage stabilizing chip is provided with 3 ports; a first port of the feedback optocoupler is connected between the twenty-fourth resistor and the twenty-fifth resistor, a second port of the feedback optocoupler is connected with the anode of a twentieth diode, the cathode of the twentieth diode is connected with one end of a ninth electrolytic capacitor, the ninth electrolytic capacitor is grounded, a third port of the feedback optocoupler is connected with the twentieth resistor, and a fourth port of the feedback optocoupler is connected with the twenty-first resistor; a twenty-second resistor, a fifth capacitor and a twenty-first diode which are connected in series are connected in parallel, and a twenty-second diode and a twenty-third resistor are connected in parallel; a twenty-fourth diode is connected with the twenty-fifth resistor in series, and then connected with a twenty-seventh resistor, a twenty-eighth resistor and a twenty-ninth resistor in parallel respectively; and a sixth capacitor and a twenty-sixth resistor which are connected in series are bridged between the first port and the second port of the parallel voltage stabilizing chip, and the third port is grounded.
9. The power supply structure of an electric energy meter according to claim 7, wherein the twenty-third resistor, the twentieth diode, the twenty-second diode and the ninth electrolytic capacitor constitute a low-voltage soft start unit; in the process that the voltage at the output end of the power conversion module is slowly increased, the ninth electrolytic capacitor is charged through a twenty-third resistor, and the voltage at the output end of the power conversion module can also be charged through a twenty-fourth resistor, a feedback optocoupler built-in diode and a twentieth diode; when the voltage of the output end of the power conversion module is in a low-voltage state, a built-in diode of a feedback optocoupler is conducted to generate a feedback signal to the switching power supply chip so as to ensure the normal work of the switching power supply chip; and along with the gradual increase of the secondary output voltage of the power conversion module, the voltage value is set by the parallel voltage stabilization chip and the feedback signal is generated to ensure the low-voltage stable start of the power supply structure of the electric energy meter.
10. The power supply structure of the electric energy meter according to claim 7, wherein the twenty-second diode assists the ninth electrolytic capacitor in discharging the stored electric energy when the power supply structure of the electric energy meter is powered down.
11. The power supply structure of an electric energy meter according to claim 1, characterized in that the power supply structure of an electric energy meter further comprises:
and the voltage output module is electrically connected with the power conversion module and used for outputting voltage.
12. The power supply structure of the electric energy meter according to claim 11, wherein the voltage output module comprises a twenty-third diode, a thirtieth resistor, an eighth capacitor, a ninth capacitor and an eleventh electrolytic capacitor; and after the thirtieth resistor and the eighth capacitor are connected in series, the thirtieth resistor is connected with the twenty-third diode in parallel and then connected with the eleventh electrolytic capacitor, and the eleventh electrolytic capacitor is connected with the ninth capacitor in parallel.
13. An electric energy meter, comprising a power supply structure of the electric energy meter according to any one of claims 1 to 12.
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| CN201810964325.XA CN110858751A (en) | 2018-08-23 | 2018-08-23 | Power supply structure of electric energy meter and electric energy meter |
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| CN201810964325.XA CN110858751A (en) | 2018-08-23 | 2018-08-23 | Power supply structure of electric energy meter and electric energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116359603A (en) * | 2023-03-29 | 2023-06-30 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116359603A (en) * | 2023-03-29 | 2023-06-30 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
| CN116359603B (en) * | 2023-03-29 | 2023-10-24 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
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