CN112165256A - DC-to-DC isolating switch power supply system for three-phase multifunctional electric energy meter - Google Patents
DC-to-DC isolating switch power supply system for three-phase multifunctional electric energy meter Download PDFInfo
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- CN112165256A CN112165256A CN202011190347.9A CN202011190347A CN112165256A CN 112165256 A CN112165256 A CN 112165256A CN 202011190347 A CN202011190347 A CN 202011190347A CN 112165256 A CN112165256 A CN 112165256A
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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
- H02M3/26—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode to produce the intermediate ac
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/346—Passive non-dissipative snubbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a direct current-to-direct current isolation switch power supply system for a three-phase multifunctional electric energy meter, which comprises a filtering energy storage unit, a power conversion and transformation unit, a control unit, a power supply unit, a feedback unit, an A-phase metering unit, a first rectification and filtering unit, a B-phase metering unit, a second rectification and filtering unit, a C-phase metering unit and a third rectification and filtering unit, wherein the filtering energy storage unit is connected with the power conversion and transformation unit; the power conversion transformation unit is connected to the filtering energy storage unit to convert the input direct current; the control unit regulates and controls the power conversion transformation unit to control the output of the power conversion transformation unit; the three rectifying and filtering units are used for rectifying and filtering the output converted by the power conversion and transformation unit and then respectively input the output to the three metering units. The DC-to-DC isolating switch power supply system for the three-phase multifunctional electric energy meter converts an original one-path DC output power supply in the three-phase multifunctional electric energy meter as an input into three paths of DC power supplies which are isolated from each other and output to supply power to three paths of metering circuits respectively.
Description
Technical Field
The invention relates to a DC-to-DC isolating switch power supply system for a three-phase multifunctional electric energy meter.
Background
The current sampling element of the current sampling loop of the three-phase electric energy meter mostly uses three current transformers. The influence of the direct current component in the current loop on the metering precision needs to be considered, so that the volume of the current transformer is increased, and the cost is increased. And the antimagnetic requirement of customers on the electric energy meter is higher and higher, and the magnetic core of the current transformer is easily saturated under the strong magnetic action, so that the metering precision is influenced. Some market customers use self-developed structural members and the current loop only supports the installation of three-way manganin shunts.
For the reasons, the current sampling of the three-phase electric energy meter by adopting the three-way manganin shunt is more and more. When three paths of manganin shunts are used for current sampling, three paths of mutually isolated metering circuit schemes are mostly adopted. This requires three separate dc power supplies to power the three metering circuits.
The existing technical scheme is mostly a transformer power supply scheme and is only suitable for a three-phase electric energy meter which is simple in function and low in requirement on power supply power. More and more three-phase multifunctional electric energy meters in the market have higher and higher requirements on power supplies, and the traditional linear transformer power supply scheme has the defects of large volume, heavy weight, incapability of meeting the requirements of high-power output and wide voltage range use. The multifunctional electric energy meter is rarely used. The three-phase multifunctional electric energy meter mostly adopts an AC-DC switching power supply scheme. The high-frequency transformer used in the AC-DC switching power supply is small in size, and three isolated power supplies are required to be led out from the high-frequency transformer to supply power to the three-phase metering circuit respectively, so that the realization is almost impossible.
Disclosure of Invention
The invention provides a DC-to-DC isolating switch power supply system for a three-phase multifunctional electric energy meter, which adopts the following technical scheme:
a DC-to-DC isolation switch power supply system for a three-phase multifunctional electric energy meter comprises:
the filtering energy storage unit is used for filtering high-frequency noise in the input direct current and storing the input direct current;
the power conversion and transformation unit is used for being connected to the filtering and energy storage unit to convert the input direct current;
the control unit is used for regulating and controlling the power conversion and transformation unit so as to control the output of the power conversion and transformation unit;
the power supply unit is connected to the power conversion transformation unit and the control unit to supply power to the control unit;
the feedback unit is connected to the power conversion transformation unit and the control unit so as to feed back the working state of the power conversion transformation unit to the control unit;
the first rectification filtering unit is connected to the power conversion transformation unit and the A-phase metering unit so as to carry out rectification filtering processing on the first output converted by the power conversion transformation unit and then transmit the first output to the A-phase metering unit;
the second rectification filtering unit is connected to the power conversion transformation unit and the B-phase metering unit so as to carry out rectification filtering processing on the second output converted by the power conversion transformation unit and then transmit the second output to the B-phase metering unit;
and the third rectifying and filtering unit is used for being connected to the power conversion transformation unit and the C-phase metering unit so as to carry out rectifying and filtering processing on the third output converted by the power conversion transformation unit and then transmit the third output to the C-phase metering unit.
Further, the power conversion transformation unit is a high-frequency transformer T1;
the high-frequency transformer T1 includes a primary winding, an auxiliary winding, and three output windings.
Further, the filtering energy storage unit comprises a filtering energy storage circuit;
the filtering energy storage circuit comprises: a first inductor L1, a second inductor L2, an electrolytic capacitor C1 and a second capacitor C2;
one end of the first inductor L1 is connected to the input direct current and the other end is connected to the anode of the electrolytic capacitor C1;
one end of the second inductor L2 is grounded and the other end is connected to the cathode of the electrolytic capacitor C1;
the anode of the electrolytic capacitor C1 is connected to the first end of the primary winding and the cathode thereof is connected to the first end of the auxiliary winding;
one end of the second capacitor C2 is connected to the first end of the primary winding and the other end is connected to the first end of the auxiliary winding.
Further, the control unit comprises a control circuit;
the control circuit includes: the flyback control circuit comprises a flyback control chip U1, a power switch tube Q1, a third resistor R3, a fourth resistor R4 and a third diode D3;
the HV pin of the flyback control chip U1 is connected with the first end of the primary winding;
one end of the third resistor R3 is connected to the GATE pin of the flyback control chip U1 and the other end is connected to the G pole of the power switch Q1;
the cathode of the third diode D3 is connected to the GATE pin of the flyback control chip U1 and the anode thereof is connected to the G pole of the power switch Q1;
one end of the fourth resistor R4 is connected to the anode of the third diode D3 and the G pole of the power switch Q1, respectively, and the other end is connected to the S pole of the power switch Q1;
an ISEN pin of the flyback control chip U1 is connected to an S pole of the power switch tube Q1;
the D pole of the power switch Q1 is connected to the second end of the primary winding.
Further, the power supply unit includes a power supply circuit;
the power supply circuit includes: a second diode D2, a second resistor R2, and a fifth capacitor C5;
the anode of the second diode D2 is connected to the second end of the auxiliary winding and the cathode thereof is connected to one end of the second resistor R2;
one end of a fifth capacitor C5 is connected to the other end of the second resistor R2 and the other end thereof is connected to the first end of the auxiliary winding;
the VCC pin of the flyback control chip U1 is connected between the second resistor R2 and the fifth capacitor C5.
Further, the feedback unit includes a voltage feedback unit and a current feedback unit.
Further, the voltage feedback unit comprises a voltage feedback circuit;
the voltage feedback circuit comprises a fifth resistor R5 and a sixth resistor R6;
one end of the fifth resistor R5 is connected to the second end of the auxiliary winding and the other end thereof is connected to the VSEN pin of the flyback control chip U1;
one end of the sixth resistor R6 is connected to the first end of the auxiliary winding and the other end thereof is connected to the VSEN pin of the flyback control chip U1;
the current feedback unit comprises a current feedback circuit;
the current feedback circuit comprises a thirteenth resistor R13;
one end of the thirteenth resistor R13 is connected to the first end of the auxiliary winding and the other end is connected to the S-pole of the power switch Q1.
Furthermore, the first rectifying and filtering unit comprises a first rectifying and filtering circuit;
the first rectifying and filtering circuit comprises: a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8, an eighth resistor R8, a seventh resistor R7 and a sixth capacitor C6;
the anode of the fourth diode D4 is connected to the second end of one of the three output windings and the cathode thereof is connected to one end of the seventh capacitor C7, the eighth capacitor C8 and the eighth resistor R8, respectively;
the other ends of the seventh capacitor C7, the eighth capacitor C8 and the eighth resistor R8 are connected to a first end of one of the three output windings;
one end of the seventh resistor R7 is connected to the anode of the fourth diode D4 and the other end is connected to one end of the sixth capacitor C6;
the other end of the sixth capacitor C6 is connected to the cathode of the fourth diode D4;
the second rectifying and filtering unit comprises a second rectifying and filtering circuit;
the second rectifying and filtering circuit comprises: a fifth diode D5, a tenth capacitor C10, an eleventh capacitor C11, a tenth resistor R10, a ninth resistor R9 and a ninth capacitor C9;
an anode of the fifth diode D5 is connected to the second end of another one of the three output windings and a cathode thereof is connected to one end of the tenth capacitor C10, the eleventh capacitor C11 and the tenth resistor R10, respectively;
the other ends of the tenth capacitor C10, the eleventh capacitor C11 and the tenth resistor R10 are connected to a first end of another one of the three output windings;
one end of the ninth resistor R9 is connected to the anode of the fifth diode D5 and the other end is connected to one end of the ninth capacitor C9;
the other end of the ninth capacitor C9 is connected to the cathode of the fifth diode D5;
the third rectifying and filtering unit comprises a third rectifying and filtering circuit;
the third rectifying and filtering circuit comprises: a sixth diode D6, a thirteenth capacitor C13, a fourteenth capacitor C14, a twelfth resistor R12, an eleventh resistor R11 and a twelfth capacitor C12;
the anode of the sixth diode D6 is connected to the second end of the last of the three output windings and the cathode thereof is connected to one end of the thirteenth capacitor C13, the fourteenth capacitor C14 and the twelfth resistor R12, respectively;
the other ends of the thirteenth capacitor C13, the fourteenth capacitor C14 and the twelfth resistor R12 are connected to the first end of the last of the three output windings;
one end of the eleventh resistor R11 is connected to the anode of the sixth diode D6 and the other end is connected to one end of the twelfth capacitor C12;
the other end of the twelfth capacitor C12 is connected to the cathode of the sixth diode D6.
Further, the dc-to-dc isolation switch power supply system for the three-phase multifunctional electric energy meter further comprises:
and the peak absorption unit is used for being respectively connected to the power conversion transformation unit and the filtering energy storage unit so as to eliminate the voltage peak of the power conversion transformation unit.
Further, the spike absorption unit includes a spike absorption circuit;
the spike absorption circuit comprises a first diode D1, a first resistor R1 and a third capacitor C3;
the anode of the first diode D1 is connected to the second end of the primary winding and the cathode is connected to one end of the first resistor R1 and the third capacitor C3 respectively;
the other ends of the first resistor R1 and the third capacitor C3 are connected to a first end of the primary winding.
The DC-to-DC isolating switch power supply system for the three-phase multifunctional electric energy meter has the advantages that one path of original DC output power supply in the three-phase multifunctional electric energy meter is used as input, the input is converted into three paths of DC power supplies to be output, and the three paths of DC power supplies are respectively used for supplying power to the three paths of metering circuits. The three paths of output direct-current power supplies are isolated from the input direct-current power supply, and the three paths of output direct-current power supplies are also isolated from each other, so that the insulation test requirement of the electric energy meter is met.
Drawings
FIG. 1 is a schematic diagram of a DC-to-DC isolating switch power supply system for a three-phase multifunctional electric energy meter according to the present invention;
fig. 2 is a circuit diagram of a dc-to-dc isolation switch power supply system for a three-phase multifunctional electric energy meter according to the invention.
The direct current-to-direct current isolation switch power supply system 100 for the three-phase multifunctional electric energy meter comprises a filtering energy storage unit 11, a power conversion transformation unit 12, a control unit 13, a power supply unit 14, a feedback unit 15, a first rectification filtering unit 17, a second rectification filtering unit 19, a third rectification filtering unit 21 and a peak absorption unit 22.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Fig. 1 shows a dc-to-dc isolation switch power supply system 100 for a three-phase multifunctional electric energy meter according to the present invention, which mainly comprises: the device comprises a filtering energy storage unit 11, a power conversion transformation unit 12, a control unit 13, a power supply unit 14, a feedback unit 15, a first rectifying and filtering unit 17, a second rectifying and filtering unit 19 and a third rectifying and filtering unit 21. The filtering energy storage unit 11 is used for filtering high-frequency noise in the input direct current and storing the input direct current. The power conversion and transformation unit 12 is used for being connected to the filtering and energy storage unit 11 to convert the input direct current. The control unit 13 is configured to regulate and control the power converting and transforming unit 12 to control the output of the power converting and transforming unit 12. The power supply unit 14 is used to be connected to the power conversion transformation unit 12 and the control unit 13 to supply power to the control unit 13. The feedback unit 15 is used for being connected to the power conversion transformation unit 12 and the control unit 13 to feed back the working state of the power conversion transformation unit 12 to the control unit 13. The first rectifying and filtering unit 17 is configured to be connected to the power converting and transforming unit 12 and the a-phase metering unit 16, and configured to perform rectifying and filtering processing on the first output converted by the power converting and transforming unit 12 and then transmit the first output to the a-phase metering unit 16. The second rectifying and filtering unit 19 is configured to be connected to the power converting and transforming unit 12 and the B-phase metering unit 18, and configured to perform rectifying and filtering processing on the second output converted by the power converting and transforming unit 12, and then transmit the second output to the B-phase metering unit 18. The third rectifying and filtering unit 21 is configured to be connected to the power converting and transforming unit 12 and the C-phase metering unit 20, and configured to perform rectifying and filtering processing on the third output converted by the power converting and transforming unit 12, and then transmit the third output to the C-phase metering unit 20. The A-phase metering unit 16 is used for sampling and metering the A phase of the three-phase multifunctional electric energy meter. The B-phase metering unit 18 is used for sampling and metering the B phase of the three-phase multifunctional electric energy meter. The C-phase metering unit 20 is used for sampling and metering the C phase of the three-phase multifunctional electric energy meter. Through the above dc-to-dc isolating switch power supply system 100 for the three-phase multifunctional electric energy meter, an original one-path dc output power supply in the three-phase multifunctional electric energy meter is used as an input, and is converted into three-path dc power supplies to be output, and the three-path dc power supplies are respectively used for supplying power to the three-path metering circuits. The three paths of output direct-current power supplies are isolated from the input direct-current power supply, and the three paths of output direct-current power supplies are also isolated from each other, so that the insulation test requirement of the electric energy meter is met.
In a preferred embodiment, the dc-to-dc isolation switch power supply system 100 for a three-phase multifunctional electric energy meter further includes a spike absorbing unit 22. The peak absorption unit 22 is used for being connected to the power conversion transformation unit 12 and the filtering energy storage unit 11 respectively to eliminate the voltage peak of the power conversion transformation unit 12.
Fig. 2 is a circuit diagram of a dc-to-dc isolation switch power supply system 100 for a three-phase multifunctional electric energy meter according to the present invention, specifically, the power conversion transforming unit 12 is a high frequency transformer T1. The high-frequency transformer T1 includes a primary winding, an auxiliary winding, and three output windings.
The filtering energy storage unit 11 includes a filtering energy storage circuit. The filtering energy storage circuit comprises: a first inductor L1, a second inductor L2, an electrolytic capacitor C1 and a second capacitor C2. One end of the first inductor L1 is connected to the input dc power and the other end is connected to the anode of the electrolytic capacitor C1. One end of the second inductor L2 is connected to ground and the other end is connected to the negative terminal of the electrolytic capacitor C1. The electrolytic capacitor C1 has its positive pole connected to the first end of the primary winding and its negative pole connected to the first end of the auxiliary winding. One end of the second capacitor C2 is connected to the first end of the primary winding and the other end is connected to the first end of the auxiliary winding.
The control unit 13 includes a control circuit. The control circuit includes: the flyback control circuit comprises a flyback control chip U1, a power switch tube Q1, a third resistor R3, a fourth resistor R4 and a third diode D3. The HV pin of the flyback control chip U1 is connected to a first end of the primary winding. One end of the third resistor R3 is connected to the GATE pin of the flyback control chip U1 and the other end is connected to the G pole of the power switch Q1. The cathode of the third diode D3 is connected to the GATE pin of the flyback control chip U1 and the anode thereof is connected to the G pole of the power switch Q1. One end of the fourth resistor R4 is connected to the anode of the third diode D3 and the G pole of the power switch Q1, and the other end is connected to the S pole of the power switch Q1. The ISEN pin of the flyback control chip U1 is connected to the S pole of the power switch tube Q1. The D pole of the power switch Q1 is connected to the second end of the primary winding.
The power supply unit 14 includes a power supply circuit. The power supply circuit includes: a second diode D2, a second resistor R2, and a fifth capacitor C5. The anode of the second diode D2 is connected to the second end of the auxiliary winding and the cathode thereof is connected to one end of the second resistor R2. One end of the fifth capacitor C5 is connected to the other end of the second resistor R2 and the other end thereof is connected to the first end of the auxiliary winding. The VCC pin of the flyback control chip U1 is connected between the second resistor R2 and the fifth capacitor C5.
The feedback unit 15 includes a voltage feedback unit 15 and a current feedback unit 15. The voltage feedback unit 15 includes a voltage feedback circuit. The voltage feedback circuit comprises a fifth resistor R5 and a sixth resistor R6. One end of the fifth resistor R5 is connected to the second end of the auxiliary winding and the other end thereof is connected to the VSEN pin of the flyback control chip U1. One end of the sixth resistor R6 is connected to the first end of the auxiliary winding and the other end thereof is connected to the VSEN pin of the flyback control chip U1. The current feedback unit 15 includes a current feedback circuit. The current feedback circuit includes a thirteenth resistor R13. One end of the thirteenth resistor R13 is connected to the first end of the auxiliary winding and the other end is connected to the S-pole of the power switch Q1.
The first rectifying and filtering unit 17 includes a first rectifying and filtering circuit. The first rectifying and filtering circuit comprises: a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8, an eighth resistor R8, a seventh resistor R7 and a sixth capacitor C6. The anode of the fourth diode D4 is connected to the second end of one of the three output windings and the cathode thereof is connected to one end of the seventh capacitor C7, the eighth capacitor C8 and the eighth resistor R8, respectively. The other ends of the seventh capacitor C7, the eighth capacitor C8 and the eighth resistor R8 are connected to a first end of one of the three output windings. One end of the seventh resistor R7 is connected to the anode of the fourth diode D4 and the other end is connected to one end of the sixth capacitor C6. The other end of the sixth capacitor C6 is connected to the cathode of the fourth diode D4. The secondary winding of the power conversion transformer T1 is rectified into pulsating direct current through the fourth diode D4, and then the pulsating direct current is filtered through the seventh capacitor C7 to provide a direct current power supply for the load A-phase metering unit 16, the eighth capacitor C8 plays a role in filtering high-frequency ripples, and the eighth resistor R8 serves as a dummy load of the output circuit and has a function of stabilizing output voltage. The second rectifying and filtering unit 19 includes a second rectifying and filtering circuit. The second rectifying and filtering circuit comprises: a fifth diode D5, a tenth capacitor C10, an eleventh capacitor C11, a tenth resistor R10, a ninth resistor R9 and a ninth capacitor C9. An anode of the fifth diode D5 is connected to the second terminal of another one of the three output windings and a cathode thereof is connected to one terminal of the tenth capacitor C10, the eleventh capacitor C11 and the tenth resistor R10, respectively. The other ends of the tenth capacitor C10, the eleventh capacitor C11 and the tenth resistor R10 are connected to a first end of another one of the three output windings. One end of the ninth resistor R9 is connected to the anode of the fifth diode D5 and the other end is connected to one end of the ninth capacitor C9. The other end of the ninth capacitor C9 is connected to the cathode of the fifth diode D5. The third rectifying and smoothing unit 21 includes a third rectifying and smoothing circuit. The third rectifying and filtering circuit comprises: a sixth diode D6, a thirteenth capacitor C13, a fourteenth capacitor C14, a twelfth resistor R12, an eleventh resistor R11 and a twelfth capacitor C12. An anode of the sixth diode D6 is connected to the second end of the last of the three output windings and a cathode thereof is connected to one end of the thirteenth capacitor C13, the fourteenth capacitor C14 and the twelfth resistor R12, respectively. The other ends of the thirteenth capacitor C13, the fourteenth capacitor C14 and the twelfth resistor R12 are connected to the first end of the last of the three output windings.
One end of the eleventh resistor R11 is connected to the anode of the sixth diode D6 and the other end is connected to one end of the twelfth capacitor C12.
The other end of the twelfth capacitor C12 is connected to the cathode of the sixth diode D6.
In the invention, the circuit structures of the first rectifying and filtering circuit, the second rectifying and filtering circuit and the third rectifying and filtering circuit are the same, the first rectifying and filtering circuit is connected to the A-phase metering unit 16, the second rectifying and filtering circuit is connected to the B-phase metering unit 18, and the third rectifying and filtering circuit is connected to the C-phase metering unit 20. The A-phase metering unit 16, the B-phase metering unit 18 and the C-phase metering unit 20 adopt manganin shunts as sampling elements of a current loop.
The spike absorption unit 22 includes a spike absorption circuit. The spike absorption circuit includes a first diode D1, a first resistor R1, and a third capacitor C3. The anode of the first diode D1 is connected to the second end of the primary winding and the cathode is connected to one end of the first resistor R1 and the third capacitor C3, respectively. The other ends of the first resistor R1 and the third capacitor C3 are connected to a first end of the primary winding.
The original direct current output in the three-phase multifunctional electric energy meter is used as the input of the filtering energy storage circuit, and the filtering energy storage circuit filters high-frequency noise in the input power supply, provides an energy storage function for the circuit and ensures the normal operation of the circuit. After passing through the filtering and energy storage circuit, the direct current power supply enters a VCC pin of a flyback control chip U1 in the control circuit and a primary winding of a high-frequency transformer T1. And after the VCC pin of the flyback control chip U1 detects a high level, the flyback control chip starts to work to output PWM or PFM signals. And an auxiliary winding of the high-frequency transformer T1 is connected into the power supply circuit and supplies power to the control circuit through rectification and filtering of the power supply circuit. An auxiliary winding of the high-frequency transformer T1 is divided by a fifth resistor R5 and a sixth resistor R6, and voltage feedback is provided for a flyback control chip U1 in the control circuit. The thirteenth resistor R13 is a current limiting resistor of the power switch Q1, which provides current feedback to the flyback control chip U1.
The flyback control chip U1 outputs PWM or PFM signals to control the on and off of the power switch tube Q1, and the conversion of the energy of the primary coil and the secondary coil of the high-frequency transformer U1 is achieved. When the power switch Q1 is turned on, a primary current flows through the primary winding of the high frequency transformer U1, and the primary winding of the high frequency transformer U1 is equivalent to an inductor for storing energy. The fourth diode D4, the fifth diode D5 and the sixth diode D6 in the first rectifying and smoothing circuit, the second rectifying and smoothing circuit and the third rectifying and smoothing circuit as the output circuit are cut off in the reverse direction, no current flows through the secondary winding, and the output current is supplied by the seventh capacitor C7, the tenth capacitor C10 and the thirteenth capacitor C13 as the rectifying and smoothing capacitors. Conversely, when the power switch Q1 is turned off, the diode in the output circuit is turned on in the forward direction, and the energy stored in the primary winding is coupled through the coil and transferred to the secondary winding, so as to realize the conversion of the energy. The secondary three-way output windings of the high-frequency transformer T1 are respectively connected with three-way output circuits, and because the circuits adopt primary side feedback, the three-way output circuits have the same structure and are all composed of rectification filter circuits. After passing through a rectification filter circuit, three paths of isolated direct currents are output.
An auxiliary winding of the high-frequency transformer T1 forms a VCC power supply to supply power to the control circuit through rectification and filtering of a second diode D2, a second resistor R2 and a fifth capacitor C5. When the VCC voltage value is larger than the preset value, the internal module of the flyback control chip U1 starts working, and the high-voltage starting circuit stops working. In the scheme, the flyback control chip U1 is SY5600, and SY5600 is a low-power switching power supply integrated IC with constant-voltage and constant-current control functions.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (10)
1. A DC-to-DC isolation switch power supply system for a three-phase multifunctional electric energy meter is characterized by comprising:
the filtering energy storage unit is used for filtering high-frequency noise in the input direct current and storing the input direct current;
the power conversion and transformation unit is connected to the filtering and energy storage unit and used for converting the input direct current;
the control unit is used for regulating and controlling the power conversion transformation unit so as to control the output of the power conversion transformation unit;
a power supply unit for connecting to the power conversion transforming unit and the control unit to supply power to the control unit;
the feedback unit is connected to the power conversion transformation unit and the control unit so as to feed back the working state of the power conversion transformation unit to the control unit;
the first rectification filtering unit is connected to the power conversion transformation unit and the A-phase metering unit so as to carry out rectification filtering processing on the first output converted by the power conversion transformation unit and then transmit the first output to the A-phase metering unit;
the second rectification filtering unit is connected to the power conversion transformation unit and the B-phase metering unit so as to carry out rectification filtering processing on the second output converted by the power conversion transformation unit and then transmit the second output to the B-phase metering unit;
and the third rectifying and filtering unit is used for being connected to the power conversion transformation unit and the C-phase metering unit so as to carry out rectifying and filtering processing on the third output converted by the power conversion transformation unit and then transmit the third output to the C-phase metering unit.
2. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 1,
the power conversion transformation unit is a high-frequency transformer T1;
the high frequency transformer T1 includes a primary winding, an auxiliary winding, and three output windings.
3. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 2,
the filtering energy storage unit comprises a filtering energy storage circuit;
the filtering energy storage circuit comprises: a first inductor L1, a second inductor L2, an electrolytic capacitor C1 and a second capacitor C2;
one end of the first inductor L1 is connected to the input direct current and the other end is connected to the anode of the electrolytic capacitor C1;
one end of the second inductor L2 is grounded and the other end is connected to the negative electrode of the electrolytic capacitor C1;
the anode of the electrolytic capacitor C1 is connected to the first end of the primary winding and the cathode thereof is connected to the first end of the auxiliary winding;
one end of the second capacitor C2 is connected to the first end of the primary winding and the other end is connected to the first end of the auxiliary winding.
4. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 3,
the control unit comprises a control circuit;
the control circuit includes: the flyback control circuit comprises a flyback control chip U1, a power switch tube Q1, a third resistor R3, a fourth resistor R4 and a third diode D3;
the HV pin of the flyback control chip U1 is connected with the first end of the primary winding;
one end of the third resistor R3 is connected to the GATE pin of the flyback control chip U1, and the other end is connected to the G pole of the power switch tube Q1;
the cathode of the third diode D3 is connected to the GATE pin of the flyback control chip U1 and the anode thereof is connected to the G pole of the power switch Q1;
one end of the fourth resistor R4 is connected to the positive electrode of the third diode D3 and the G pole of the power switch Q1, and the other end is connected to the S pole of the power switch Q1;
an ISEN pin of the flyback control chip U1 is connected to an S pole of the power switch tube Q1;
the D pole of the power switch Q1 is connected to the second end of the primary winding.
5. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 4,
the power supply unit comprises a power supply circuit;
the power supply circuit includes: a second diode D2, a second resistor R2, and a fifth capacitor C5;
the anode of the second diode D2 is connected to the second end of the auxiliary winding and the cathode thereof is connected to one end of the second resistor R2;
one end of the fifth capacitor C5 is connected to the other end of the second resistor R2 and the other end thereof is connected to the first end of the auxiliary winding;
the VCC pin of the flyback control chip U1 is connected between the second resistor R2 and the fifth capacitor C5.
6. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 5,
the feedback unit comprises a voltage feedback unit and a current feedback unit.
7. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 6,
the voltage feedback unit comprises a voltage feedback circuit;
the voltage feedback circuit comprises a fifth resistor R5 and a sixth resistor R6;
one end of the fifth resistor R5 is connected to the second end of the auxiliary winding and the other end thereof is connected to the VSEN pin of the flyback control chip U1;
one end of the sixth resistor R6 is connected to the first end of the auxiliary winding and the other end thereof is connected to the VSEN pin of the flyback control chip U1;
the current feedback unit comprises a current feedback circuit;
the current feedback circuit comprises a thirteenth resistor R13;
one end of the thirteenth resistor R13 is connected to the first end of the auxiliary winding and the other end is connected to the S pole of the power switch Q1.
8. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 7,
the first rectifying and filtering unit comprises a first rectifying and filtering circuit;
the first rectifying and filtering circuit comprises: a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8, an eighth resistor R8, a seventh resistor R7 and a sixth capacitor C6;
the anode of the fourth diode D4 is connected to the second end of one of the three output windings and the cathode thereof is connected to one end of the seventh capacitor C7, the eighth capacitor C8 and the eighth resistor R8 respectively;
the other end of the seventh capacitor C7, the eighth capacitor C8 and the eighth resistor R8 is connected to the first end of one of the three output windings;
one end of the seventh resistor R7 is connected to the anode of the fourth diode D4 and the other end is connected to one end of the sixth capacitor C6;
the other end of the sixth capacitor C6 is connected to the cathode of the fourth diode D4;
the second rectifying and filtering unit comprises a second rectifying and filtering circuit;
the second rectifying and filtering circuit comprises: a fifth diode D5, a tenth capacitor C10, an eleventh capacitor C11, a tenth resistor R10, a ninth resistor R9 and a ninth capacitor C9;
the anode of the fifth diode D5 is connected to the second end of another one of the three output windings and the cathode thereof is connected to one end of the tenth capacitor C10, the eleventh capacitor C11 and the tenth resistor R10, respectively;
the other end of the tenth capacitor C10, the eleventh capacitor C11 and the tenth resistor R10 is connected to the first end of another one of the three output windings;
one end of the ninth resistor R9 is connected to the anode of the fifth diode D5 and the other end is connected to one end of the ninth capacitor C9;
the other end of the ninth capacitor C9 is connected to the cathode of the fifth diode D5;
the third rectifying and filtering unit comprises a third rectifying and filtering circuit;
the third rectifying and filtering circuit comprises: a sixth diode D6, a thirteenth capacitor C13, a fourteenth capacitor C14, a twelfth resistor R12, an eleventh resistor R11 and a twelfth capacitor C12;
the anode of the sixth diode D6 is connected to the second end of the last of the three output windings and the cathode thereof is connected to one end of the thirteenth capacitor C13, the fourteenth capacitor C14 and the twelfth resistor R12 respectively;
the other ends of the thirteenth capacitor C13, the fourteenth capacitor C14 and the twelfth resistor R12 are connected to the first end of the last of the three output windings;
one end of the eleventh resistor R11 is connected to the anode of the sixth diode D6 and the other end is connected to one end of the twelfth capacitor C12;
the other end of the twelfth capacitor C12 is connected to the cathode of the sixth diode D6.
9. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 8,
the DC-to-DC isolating switch power supply system for the three-phase multifunctional electric energy meter further comprises:
and the peak absorption unit is used for being respectively connected to the power conversion transformation unit and the filtering energy storage unit so as to eliminate the voltage peak of the power conversion transformation unit.
10. The DC-to-DC isolation switch power supply system for the three-phase multifunctional electric energy meter according to claim 9,
the spike absorption unit comprises a spike absorption circuit;
the spike absorption circuit includes a first diode D1, a first resistor R1, and a third capacitor C3;
the anode of the first diode D1 is connected to the second end of the primary winding and the cathode is connected to one end of the first resistor R1 and the third capacitor C3 respectively;
the other end of the first resistor R1 and the third capacitor C3 are connected to a first end of the primary winding.
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Application publication date: 20210101 |