CN102520241B - Three-phase charge-controlled electric energy meter based on resistance-capacitance voltage reduction and low-voltage direct-current/direct-current (DC/DC) power supply - Google Patents
Three-phase charge-controlled electric energy meter based on resistance-capacitance voltage reduction and low-voltage direct-current/direct-current (DC/DC) power supply Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 145
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Abstract
The invention relates to a three-phase charge-controlled intelligent electric energy meter, and provides a low-power-consumption three-phase charge-controlled intelligent electric energy meter in which a three-phase charge-controlled electric energy meter power supply scheme is based on a resistance-capacitance voltage reduction principle and a low-voltage direct-current/direct-current (DC/DC) conversion power supply. The electric energy meter comprises a line power supply, an auxiliary power supply, a singlechip central processing unit (CPU) and a three-phase charge-controlled intelligent electric energy meter basic function module, wherein the line power supply consists of a resistance-capacitance voltage reduction circuit, a low-voltage DC/DC switching power supply circuit and a 485 power supply control circuit which are connected in turn; the auxiliary power supply is a switching power supply circuit; a pulse output booster circuit at an input/output (IO) port provides working voltage for a liquid crystal display part of the three-phase charge-controlled electric energy meter; and an external battery power supply circuit of the three-phase charge-controlled electric energy meter consists of an external battery which is matched with a DC-DC booster circuit to provide a power supply for meter reading during power failure. Power supply efficiency can be effectively improved, the power consumption of the electric energy meter is reduced, cost is reduced, and the requirements of energy conservation and environment friendliness are met.
Description
Technical field
The present invention relates to a kind of Triphase control-rate intelligent electric energy meter, particularly a kind of Three-fee-controlled electric energy meter electric source scheme is used the low-power consumption Triphase control-rate intelligent electric energy meter of resistance-capacitance depressurization principle and low voltage DC/DC converting power source.
Background technology
Widespread use transformer scheme in the power source design of Triphase control-rate intelligent electric energy meter at present, it is high that transformer scheme has stability, the advantages such as isolation effect is good, but general transformer frequency response scheme efficiency is lower, volume is larger, use the three-phase intelligent electric-energy meter power consumption of transformer frequency response scheme larger, and complete machine is heavier, can not adapt to modern society to the energy-saving and cost-reducing demand of electric energy meter itself.
Summary of the invention
Object of the present invention is exactly in order to overcome above-mentioned weak point of the prior art, and provide a kind of low-power consumption 1.0/0.5S level Triphase control-rate intelligent electric energy meter, line power scheme adopts resistance-capacitance depressurization principle to combine with low voltage DC/DC Switching Power Supply scheme, accessory power supply adopts the power source design being made up of switch power special chip, effectively improve power-efficient, reduce electric energy meter oneself power consumption, reduce costs, meet the requirement of energy-conserving and environment-protective.
The object of the invention is to be achieved by the following technical measures: based on the Three-fee-controlled electric energy meter of resistance-capacitance depressurization and low voltage DC/DC power supply, comprise line power, accessory power supply, single-chip microcomputer CPU (central processing unit) and Triphase control-rate intelligent electric energy meter basic function module, described line power is by capacitance-resistance voltage reduction circuit, and low voltage DC/DC switching power circuit and 485 power control circuits are connected to form successively; Described accessory power supply is switching power circuit.
In technique scheme, described capacitance-resistance voltage reduction circuit comprises voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3, inductance L 1 ~ inductance L 5, resistance R 7 ~ resistance R 9, capacitor C 11 ~ capacitor C 18, rectifier bridge D6, rectifier bridge D7, voltage stabilizing diode D8 and voltage stabilizing diode D9; A phase line is through inductance L 1, and resistance R 7 and capacitor C 11 are connected to 3 pin of rectifier bridge D6, and B phase line is through inductance L 2, resistance R 8 and capacitor C 12 are connected to 4 pin of rectifier bridge D6, C phase line is through inductance L 3, and resistance R 9 and capacitor C 13 are connected to 3 pin of rectifier bridge D7, and N line is connected to 4 pin of rectifier bridge D7; A phase line, B phase line and C phase line are connected to N line through voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3 respectively; 1 pin of rectifier bridge D6 is connected with 1 pin of rectifier bridge D7, and 2 pin of rectifier bridge D6 are connected with 2 pin of rectifier bridge D7; Electrochemical capacitor C14 is connected between 1 pin and 2 pin of rectifier bridge D6, and capacitor C 15, capacitor C 16 and zener diode D8 are connected in parallel on capacitor C 14 two ends; 1 pin of rectifier bridge D6 through inductance L 4 be connected to output voltage V+, 2 pin of rectifier bridge D6 through inductance L 5 be connected to output voltage V-, capacitor C 17, capacitor C 18 and voltage stabilizing diode D9 be connected in parallel on output voltage V+and V-between.
In technique scheme, described low voltage DC/DC switching power circuit comprises resistance R 1 ~ resistance R 6, capacitor C 1 ~ capacitor C 5, voltage stabilizing diode D1, diode D2, compound diode D3, compound diode D4, field effect transistor Q1, voltage dependent resistor (VDR) RT7, comparer U1 and pickup coil T1; Capacitance-resistance voltage reduction circuit output voltage V-through resistance R 5 and voltage stabilizing diode D1 be connected to capacitance-resistance voltage reduction circuit output voltage V+, capacitor C 1 is connected in parallel on the two ends of voltage stabilizing diode D1; V+ is connected to 3 pin of comparer U1 through resistance R 1, V+ is connected to 4 pin of comparer U1 through resistance R 6,1 pin of comparer U1 is connected to 4 pin through resistance R 3, the 1 foot meridian capacitor C2 of comparer U1 is connected to 2 pin, 3 pin of comparer U1 are connected to 4 pin through resistance R 2,2 pin of comparer U1 are connected to V-through resistance R 5, and 3 pin of comparer U1 are connected to V-through resistance R 4 and resistance R 5, and 5 pin of comparer U1 are connected to V+; 4 pin of comparer U1 are connected to the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is connected to V-through resistance R 5, the drain electrode of field effect transistor Q1 is connected to 3 pin of pickup coil T1, and V+ is connected to 2 pin of pickup coil T1, and V-is connected to 1 pin of pickup coil T1 through resistance R 5 and compound diode D3; Voltage dependent resistor (VDR) RT7 is connected in parallel between the source electrode and drain electrode of field effect transistor Q1; 5 pin of pickup coil T1 are respectively VCON and VAA through compound diode D4 output two-way voltage, and 4 pin of pickup coil T1 are GND, are connected with capacitor C 3 between VCON and GND, are connected with capacitor C 4 between VAA and GND; 7 pin of pickup coil T1 are through diode D2 output voltage V DD_485, and 6 pin of pickup coil T1 are GND_485, are connected with capacitor C 5 between VDD_485 and GND_485.
In technique scheme, described 485 power control circuits comprise resistance R 10 ~ resistance R 16, capacitor C 7, capacitor C 8, triode BG3, triode BG4, voltage stabilizing triode U2 and optocoupler OP1, wherein, low voltage DC/DC switching power circuit output voltage V CON is connected to 1 pin of voltage stabilizing triode U2 through resistance R 10, voltage VCON is connected to 3 pin of voltage stabilizing triode U2 through resistance R 12,3 pin of voltage stabilizing triode U2 are connected to GND through resistance R 13, capacitor C 7 is connected between 3 pin and GND of voltage stabilizing triode U2, and 2 pin of voltage stabilizing triode U2 are connected to GND, 1 pin of optocoupler OP1 is connected to voltage VCON through resistance R 10, 2 pin of optocoupler OP1 are connected to GND, 4 pin of optocoupler OP1 are connected to low voltage DC/DC switching power circuit output voltage V DD_485, 4 pin of optocoupler OP1 are connected to the emitter of triode BG3 through resistance R 14, 3 pin of optocoupler OP1 are connected to the base stage of triode BG4 through resistance R 16, the collector of triode BG3 is connected to voltage VCC_485, the base stage of triode BG3 is connected to GND_485 through resistance R 15, the base stage of triode BG3 is connected to the collector of triode BG4 through resistance R 11, the emitter of triode BG4 is connected to GND_485, between voltage VCC_485 and GND_485, be connected with capacitor C 8.
In technique scheme, described 485 power control circuits comprise triode BG1, triode BG2, resistance R 17, resistance R 18, capacitor C 6 and optocoupler OP2; 1 pin and 2 pin of optocoupler OP2 are connected to single-chip microcomputer central control unit, and 3 pin of optocoupler OP2 are connected to the base stage of triode BG1, and 4 pin of optocoupler OP2 are connected to the collector of triode BG2; The base stage of triode BG1 is connected to GND_485 through resistance R 18, the collector of triode BG1 is connected to voltage VCC_485, the emitter of triode BG1 is connected to the base stage of triode BG2, low voltage DC/DC switching power circuit output voltage V DD_485 is connected to the emitter of triode BG2, VDD_485 is connected to the emitter of triode BG1 through resistance R 17, be connected with capacitor C 6 between voltage VCC_485 and GND_485.
In technique scheme, described accessory power supply part switching power circuit comprises composite thermistor RT4, voltage dependent resistor (VDR) RT5, voltage dependent resistor (VDR) RT6, inductance L 6, inductance L 7, capacitor C 19 ~ capacitor C 30, diode D10 ~ diode D18, resistance R 19 ~ resistance R 26, switching power source chip U3, the model of U3 is VIPER17L, three-terminal voltage-stabilizing pipe U4, optocoupler OP3 and pickup coil T2, between accessory power supply L ' and N ', be connected with voltage dependent resistor (VDR) RT6, L ' is connected to 1 pin of composite thermistor RT4, N ' is connected to 3 pin of composite thermistor RT4, capacitor C 19 is connected in parallel between 2 pin and N ' of composite thermistor RT4, 2 pin of composite thermistor RT4 are connected to 4 pin of rectifier bridge D11 through inductance L 6, N ' is connected to 3 pin of rectifier bridge D11 through inductance L 7, voltage dependent resistor (VDR) RT5 is connected between 3 pin and 4 pin of rectifier bridge D11, capacitor C 20 is connected between 1 pin and 2 pin of rectifier bridge D11, 1 pin of rectifier bridge D11 is connected to 1 pin of pickup coil T2, 2 pin of rectifier bridge D11 are connected to 5 pin of pickup coil T2, 1 pin of pickup coil T2 is connected to 2 pin through voltage stabilizing diode D13 and diode D14, 2 pin of pickup coil T2 are connected to 8 pin of switching power source chip U3, 4 pin of pickup coil T2 are connected to 2 pin of U3 through diode D16 and resistance R 19, 5 pin of pickup coil T2 are connected to 1 pin of U3, capacitor C 21, capacitor C 22 and voltage stabilizing diode D10 are connected in parallel between 1 pin and 2 pin of U3, capacitor C 23 is connected between 4 pin and 5 pin of U3,7 pin of pickup coil T2 output voltage after diode D15 is VCC_FK, 6 pin of pickup coil T2 are connected to GND, and capacitor C 26 and capacitor C 27 are connected in parallel between VCC_FK and GND, voltage VCC_FK is connected to 1 pin of optocoupler OP3 through resistance R 20, VCC_FK is connected to 2 pin of optocoupler OP3 through resistance R 24, resistance R 25 and capacitor C 29, and 1 pin of optocoupler OP3 is connected with 2 pin of optocoupler OP3 through resistance R 20, resistance R 21, the plus earth of three-terminal voltage-stabilizing pipe U4, the negative electrode of three-terminal voltage-stabilizing pipe U4 is connected to 2 pin of optocoupler OP3, and the reference utmost point of three-terminal voltage-stabilizing pipe U4 is connected to GND through resistance R 26, 4 pin of optocoupler OP3 are connected to 4 pin of U3, and 3 pin of optocoupler OP3 are connected to 5 pin of U3, the 5 foot meridian capacitor C30 of pickup coil T2 are connected to 6 pin, voltage VCC_FK is output voltage V AA after resistance R 23, is connected with capacitor C 28 between voltage VAA and GND, 12 pin of pickup coil T2 output voltage after diode D18 and resistance R 22 is VCC_485,11 pin of pickup coil T2 are connected to GND_485, capacitor C 24 is connected between the negative electrode and GND_485 of diode D18, voltage stabilizing diode D12 is connected in parallel on capacitor C 24 two ends, voltage stabilizing diode D17 is connected in parallel between voltage VCC_485 and GND_485, is connected with capacitor C 25 between VCC_485 and GND_485 simultaneously.
In technique scheme, the external battery power circuit of described Three-fee-controlled electric energy meter uses an external battery, coordinates DC-DC booster circuit to provide power cut-off recording power supply for electric energy meter; Described external battery power supply booster circuit comprises capacitor C 31 ~ capacitor C 33, resistance R 27 ~ resistance R 30, diode D19 ~ diode D21, field effect transistor Q2, triode Q3, step-up DC-DC conversion chip U5 and battery BT1; Wherein, the base stage of triode Q3 is connected to the detection of power loss end of single-chip microcomputer CPU (central processing unit) through resistance R 27, and the emitter of triode Q3 is connected to voltage VAA, and the collector of triode Q3 is connected to GND through resistance R 28; The positive pole of battery BT1 is connected to the source S of field effect transistor Q2, the negative pole of battery BT1 is connected to GND, capacitor C 31 is connected in parallel on the two ends of battery BT1, the source S of field effect transistor Q2 is connected to grid G through resistance R 29, the grid G of field effect transistor Q2 is through resistance R 30, and diode D21 and resistance R 28 are connected to GND; The drain D of field effect transistor Q2 is connected to GND through capacitor C 32, the drain D of field effect transistor Q2 is connected to 3 pin of DC-DC conversion chip U5,1 pin of DC-DC conversion chip U5 is connected to GND, 2 pin of DC-DC conversion chip U5 are connected to GND through voltage stabilizing diode D20, capacitor C 33 is connected in parallel on the two ends of voltage stabilizing diode D20,3 pin of DC-DC conversion chip U5 are connected to 2 pin through diode D19, and 2 pin of U5 are external battery voltage output end.
In technique scheme, the liquid-crystal display section of described Three-fee-controlled electric energy meter adopts IO mouth pulse output booster circuit that operating voltage is provided; Described pulse output booster circuit comprises capacitor C 34 ~ capacitor C 36, resistance R 31, compound diode D22, diode D23; Wherein, the IO mouth P03 of single-chip microcomputer CPU (central processing unit) is connected to GND through 1 pin and the capacitor C 35 of resistance R 31, compound diode D22, capacitor C 34 is connected between 1 pin and 2 pin of compound diode D22,2 pin of compound diode D22 output voltage V CC_LCD after diode D23, capacitor C 36 is connected in parallel between output voltage V CC_LCD and GND.
The Three-fee-controlled electric energy meter that the present invention is based on resistance-capacitance depressurization and low voltage DC/DC power supply compared with prior art has the following advantages: the mode that line power scheme adopts resistance-capacitance depressurization principle to combine with low voltage DC/DC Switching Power Supply scheme, effectively improve power-efficient, reduce electric energy meter oneself power consumption, reduce electric energy meter cost; It is also low-power dissipation power supply that accessory power supply adopts Switching Power Supply, reduces power volume and weight, realizes high-level efficiency; 485 power supplys add power control circuit, prevent because of brownout, when the attack such as excessive or extraneous static of electric current, protect front stage circuits normally to work, and are not damaged; Liquid-crystal display section adopts IO mouth pulse output booster circuit that operating voltage is provided; External battery power circuit only uses an external battery, coordinates DC-DC booster circuit for electric energy meter provides power cut-off recording power supply, has reduced the hardware cost of electric energy meter; Meet the requirement of energy-conserving and environment-protective, meet the energy-saving and cost-reducing development trend of electric energy meter.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams that the present invention is based on the Three-fee-controlled electric energy meter of resistance-capacitance depressurization and low voltage DC/DC power supply.
Fig. 2 is the circuit theory diagrams of circuit power unit in the present invention.
Fig. 3 is capacitance-resistance voltage reduction circuit connection diagram in the present invention.
Fig. 4 is mesolow DC/DC switching power circuit connection diagram of the present invention.
Fig. 5 is 485 power control circuit example one connection diagrams in the present invention.
Fig. 6 is 485 power control circuit example two connection diagrams in the present invention.
Fig. 7 is accessory power supply part switching power circuit connection diagram in the present invention.
Fig. 8 is external battery supply booster circuit connection diagram in the present invention.
Fig. 9 is pulse output booster circuit connection diagram in the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, 2, the invention provides a kind of Three-fee-controlled electric energy meter based on resistance-capacitance depressurization and low voltage DC/DC power supply, comprise line power, accessory power supply, single-chip microcomputer CPU (central processing unit) and Triphase control-rate intelligent electric energy meter basic function module, described line power and accessory power supply are given respectively single-chip microcomputer CPU (central processing unit) and the power supply of Triphase control-rate intelligent electric energy meter basic function module, described line power is by capacitance-resistance voltage reduction circuit, and low voltage DC/DC switching power circuit and 485 power control circuits are connected to form successively; Described accessory power supply is switching power circuit.
Be illustrated in figure 3 capacitance-resistance voltage reduction circuit connection diagram in the present invention.Described capacitance-resistance voltage reduction circuit comprises voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3, inductance L 1 ~ inductance L 5, resistance R 7 ~ resistance R 9, capacitor C 11 ~ capacitor C 18, rectifier bridge D6, rectifier bridge D7, voltage stabilizing diode D8 and voltage stabilizing diode D9; A phase line is through inductance L 1, and resistance R 7 and capacitor C 11 are connected to 3 pin of rectifier bridge D6, and B phase line is through inductance L 2, resistance R 8 and capacitor C 12 are connected to 4 pin of rectifier bridge D6, C phase line is through inductance L 3, and resistance R 9 and capacitor C 13 are connected to 3 pin of rectifier bridge D7, and N line is connected to 4 pin of rectifier bridge D7; A phase line, B phase line and C phase line are connected to N line through voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3 respectively; 1 pin of rectifier bridge D6 is connected with 1 pin of rectifier bridge D7, and 2 pin of rectifier bridge D6 are connected with 2 pin of rectifier bridge D7; Electrochemical capacitor C14 is connected between 1 pin and 2 pin of rectifier bridge D6, and capacitor C 15, capacitor C 16 and zener diode D8 are connected in parallel on capacitor C 14 two ends; 1 pin of rectifier bridge D6 through inductance L 4 be connected to output voltage V+, 2 pin of rectifier bridge D6 through inductance L 5 be connected to output voltage V-, capacitor C 17, capacitor C 18 and voltage stabilizing diode D9 be connected in parallel on output voltage V+and V-between.
Be illustrated in figure 4 mesolow DC/DC switching power circuit connection diagram of the present invention.Described low voltage DC/DC switching power circuit comprises resistance R 1 ~ resistance R 6, capacitor C 1 ~ capacitor C 5, voltage stabilizing diode D1, diode D2, compound diode D3, compound diode D4, field effect transistor Q1, voltage dependent resistor (VDR) RT7, comparer U1 and pickup coil T1; Capacitance-resistance voltage reduction circuit output voltage V-through resistance R 5 and voltage stabilizing diode D1 be connected to capacitance-resistance voltage reduction circuit output voltage V+, capacitor C 1 is connected in parallel on the two ends of voltage stabilizing diode D1; V+ is connected to 3 pin of comparer U1 through resistance R 1, V+ is connected to 4 pin of comparer U1 through resistance R 6,1 pin of comparer U1 is connected to 4 pin through resistance R 3, the 1 foot meridian capacitor C2 of comparer U1 is connected to 2 pin, 3 pin of comparer U1 are connected to 4 pin through resistance R 2,2 pin of comparer U1 are connected to V-through resistance R 5, and 3 pin of comparer U1 are connected to V-through resistance R 4 and resistance R 5, and 5 pin of comparer U1 are connected to V+; 4 pin of comparer U1 are connected to the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is connected to V-through resistance R 5, the drain electrode of field effect transistor Q1 is connected to 3 pin of pickup coil T1, and V+ is connected to 2 pin of pickup coil T1, and V-is connected to 1 pin of pickup coil T1 through resistance R 5 and compound diode D3; Voltage dependent resistor (VDR) RT7 is connected in parallel between the source electrode and drain electrode of field effect transistor Q1; 5 pin of pickup coil T1 are respectively VCON and VAA through compound diode D4 output two-way voltage, and 4 pin of pickup coil T1 are GND, are connected with capacitor C 3 between VCON and GND, are connected with capacitor C 4 between VAA and GND; 7 pin of pickup coil T1 are through diode D2 output voltage V DD_485, and 6 pin of pickup coil T1 are GND_485, are connected with capacitor C 5 between VDD_485 and GND_485.Above-mentioned voltage VAA is ammeter other circuit voltages except 485 circuit, as single chip part, and metering section, display section etc.
Be illustrated in figure 5 485 power control circuit example one connection diagrams in the present invention.Described 485 power control circuits comprise resistance R 10 ~ resistance R 16, capacitor C 7, capacitor C 8, triode BG3, triode BG4, voltage stabilizing triode U2 and optocoupler OP1, wherein, low voltage DC/DC switching power circuit output voltage V CON is connected to 1 pin of voltage stabilizing triode U2 through resistance R 10, voltage VCON is connected to 3 pin of voltage stabilizing triode U2 through resistance R 12,3 pin of voltage stabilizing triode U2 are connected to GND through resistance R 13, capacitor C 7 is connected between 3 pin and GND of voltage stabilizing triode U2, and 2 pin of voltage stabilizing triode U2 are connected to GND, 1 pin of optocoupler OP1 is connected to voltage VCON through resistance R 10, 2 pin of optocoupler OP1 are connected to GND, 4 pin of optocoupler OP1 are connected to low voltage DC/DC switching power circuit output voltage V DD_485, 4 pin of optocoupler OP1 are connected to the emitter of triode BG3 through resistance R 14, 3 pin of optocoupler OP1 are connected to the base stage of triode BG4 through resistance R 16, the collector of triode BG3 is connected to voltage VCC_485, the base stage of triode BG3 is connected to GND_485 through resistance R 15, the base stage of triode BG3 is connected to the collector of triode BG4 through resistance R 11, the emitter of triode BG4 is connected to GND_485, between voltage VCC_485 and GND_485, be connected with capacitor C 8.Above-mentioned voltage VCC_485 is 485 circuit voltages, is exported through control circuit by output voltage V DD_485 above.
Be illustrated in figure 6 485 power control circuit example two connection diagrams in the present invention.Described 485 power control circuits comprise triode BG1, triode BG2, resistance R 17, resistance R 18, capacitor C 6 and optocoupler OP2; 1 pin and 2 pin of optocoupler OP2 are connected to single-chip microcomputer central control unit, and 3 pin of optocoupler OP2 are connected to the base stage of triode BG1, and 4 pin of optocoupler OP2 are connected to the collector of triode BG2; The base stage of triode BG1 is connected to GND_485 through resistance R 18, the collector of triode BG1 is connected to voltage VCC_485, the emitter of triode BG1 is connected to the base stage of triode BG2, low voltage DC/DC switching power circuit output voltage V DD_485 is connected to the emitter of triode BG2, VDD_485 is connected to the emitter of triode BG1 through resistance R 17, be connected with capacitor C 6 between voltage VCC_485 and GND_485.Above-mentioned voltage VCC_485 is 485 circuit voltages, is exported through control circuit by output voltage V DD_485 above.
Be illustrated in figure 7 accessory power supply part switching power circuit connection diagram in the present invention.Described accessory power supply part switching power circuit comprises composite thermistor RT4, voltage dependent resistor (VDR) RT5, voltage dependent resistor (VDR) RT6, inductance L 6, inductance L 7, capacitor C 19 ~ capacitor C 30, diode D10 ~ diode D18, resistance R 19 ~ resistance R 26, switching power source chip U3, the model of U3 is VIPER17L, three-terminal voltage-stabilizing pipe U4, optocoupler OP3 and pickup coil T2, between accessory power supply L ' and N ', be connected with voltage dependent resistor (VDR) RT6, L ' is connected to 1 pin of composite thermistor RT4, N ' is connected to 3 pin of composite thermistor RT4, capacitor C 19 is connected in parallel between 2 pin and N ' of composite thermistor RT4, 2 pin of composite thermistor RT4 are connected to 4 pin of rectifier bridge D11 through inductance L 6, N ' is connected to 3 pin of rectifier bridge D11 through inductance L 7, voltage dependent resistor (VDR) RT5 is connected between 3 pin and 4 pin of rectifier bridge D11, capacitor C 20 is connected between 1 pin and 2 pin of rectifier bridge D11, 1 pin of rectifier bridge D11 is connected to 1 pin of pickup coil T2, 2 pin of rectifier bridge D11 are connected to 5 pin of pickup coil T2, 1 pin of pickup coil T2 is connected to 2 pin through voltage stabilizing diode D13 and diode D14, 2 pin of pickup coil T2 are connected to 8 pin of switching power source chip U3, 4 pin of pickup coil T2 are connected to 2 pin of U3 through diode D16 and resistance R 19, 5 pin of pickup coil T2 are connected to 1 pin of U3, capacitor C 21, capacitor C 22 and voltage stabilizing diode D10 are connected in parallel between 1 pin and 2 pin of U3, capacitor C 23 is connected between 4 pin and 5 pin of U3,7 pin of pickup coil T2 output voltage after diode D15 is VCC_FK, 6 pin of pickup coil T2 are connected to GND, and capacitor C 26 and capacitor C 27 are connected in parallel between VCC_FK and GND, voltage VCC_FK is connected to 1 pin of optocoupler OP3 through resistance R 20, VCC_FK is connected to 2 pin of optocoupler OP3 through resistance R 24, resistance R 25 and capacitor C 29, and 1 pin of optocoupler OP3 is connected with 2 pin of optocoupler OP3 through resistance R 20, resistance R 21, the plus earth of three-terminal voltage-stabilizing pipe U4, the negative electrode of three-terminal voltage-stabilizing pipe U4 is connected to 2 pin of optocoupler OP3, and the reference utmost point of three-terminal voltage-stabilizing pipe U4 is connected to GND through resistance R 26, 4 pin of optocoupler OP3 are connected to 4 pin of U3, and 3 pin of optocoupler OP3 are connected to 5 pin of U3, the 5 foot meridian capacitor C30 of pickup coil T2 are connected to 6 pin, voltage VCC_FK is output voltage V AA after resistance R 23, is connected with capacitor C 28 between voltage VAA and GND, 12 pin of pickup coil T2 output voltage after diode D18 and resistance R 22 is VCC_485,11 pin of pickup coil T2 are connected to GND_485, capacitor C 24 is connected between the negative electrode and GND_485 of diode D18, voltage stabilizing diode D12 is connected in parallel on capacitor C 24 two ends, voltage stabilizing diode D17 is connected in parallel between voltage VCC_485 and GND_485, is connected with capacitor C 25 between VCC_485 and GND_485 simultaneously.Above-mentioned VAA is ammeter other circuit voltages except 485 circuit, as single chip part, and metering section, display section etc.Above-mentioned voltage VCC_FK is Switching Power Supply feedback end voltage.
Be illustrated in figure 8 external battery supply booster circuit connection diagram in the present invention.Described external battery power supply booster circuit comprises capacitor C 31 ~ capacitor C 33, resistance R 27 ~ resistance R 30, diode D19 ~ diode D21, field effect transistor Q2, triode Q3, step-up DC-DC conversion chip U5 and battery BT1.Wherein, the base stage of triode Q3 is connected to the detection of power loss mouth of single machine unit through resistance R 27, and the emitter of triode Q3 is connected to voltage VAA, and the collector of triode Q3 is connected to GND through resistance R 28; The positive pole of battery BT1 is connected to the source S of field effect transistor Q2, and the negative pole of battery BT1 is connected to GND, and capacitor C 31 is connected in parallel on the two ends of battery BT1; The source S of field effect transistor Q2 is connected to grid G through resistance R 29, and the grid G of field effect transistor Q2 is through resistance R 30, and diode D21 and resistance R 28 are connected to GND; The drain D of field effect transistor Q2 is connected to GND through capacitor C 32; The drain D of field effect transistor Q2 is connected to 3 pin of conversion chip U5, and 1 pin of conversion chip U5 is connected to GND, and 2 pin of conversion chip U5 are connected to GND through voltage stabilizing diode D20, and capacitor C 33 is connected in parallel on the two ends of voltage stabilizing diode D20; 3 pin of conversion chip U5 are connected to 2 pin through diode D19, and 2 pin of conversion chip U5 are external battery voltage output.Above-mentioned VAA is ammeter other circuit voltages except 485 circuit, as single chip part, and metering section, display section etc.
Be illustrated in figure 9 pulse output booster circuit connection diagram in the present invention.Described pulse output booster circuit comprises capacitor C 34 ~ capacitor C 36, resistance R 31, compound diode D22, diode D23.Wherein, the IO mouth P03 of single-chip microcomputer CPU (central processing unit) is connected to GND through 1 pin and the capacitor C 35 of resistance R 31, compound diode D22, capacitor C 34 is connected between 1 pin and 2 pin of compound diode D22,2 pin of compound diode D22 output voltage V CC_LCD after diode D23, capacitor C 36 is connected in parallel between output voltage V CC_LCD and GND.Above-mentioned voltage VCC_LCD is liquid-crystal display section operating voltage.This circuit can be little current stabilization load operating voltage is provided, as liquid crystal display driving voltage of electric energy meter etc.
The content that this instructions is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1. the Three-fee-controlled electric energy meter based on resistance-capacitance depressurization and low voltage DC/DC power supply, comprise line power, accessory power supply, single-chip microcomputer CPU (central processing unit) and Triphase control-rate intelligent electric energy meter basic function module, it is characterized in that: described line power is by capacitance-resistance voltage reduction circuit, and low voltage DC/DC switching power circuit and 485 power control circuits are connected to form successively, described accessory power supply is switching power circuit, described 485 power control circuits comprise resistance R 10 ~ resistance R 16, capacitor C 7, capacitor C 8, triode BG3, triode BG4, voltage stabilizing triode U2 and optocoupler OP1, wherein, low voltage DC/DC switching power circuit output voltage V CON is connected to 1 pin of voltage stabilizing triode U2 through resistance R 10, voltage VCON is connected to 3 pin of voltage stabilizing triode U2 through resistance R 12,3 pin of voltage stabilizing triode U2 are connected to GND through resistance R 13, capacitor C 7 is connected between 3 pin and GND of voltage stabilizing triode U2, and 2 pin of voltage stabilizing triode U2 are connected to GND, 1 pin of optocoupler OP1 is connected to voltage VCON through resistance R 10, 2 pin of optocoupler OP1 are connected to GND, 4 pin of optocoupler OP1 are connected to low voltage DC/DC switching power circuit output voltage V DD_485, 4 pin of optocoupler OP1 are connected to the emitter of triode BG3 through resistance R 14, 3 pin of optocoupler OP1 are connected to the base stage of triode BG4 through resistance R 16, the collector of triode BG3 is connected to voltage VCC_485, the base stage of triode BG3 is connected to GND_485 through resistance R 15, the base stage of triode BG3 is connected to the collector of triode BG4 through resistance R 11, the emitter of triode BG4 is connected to GND_485, between voltage VCC_485 and GND_485, be connected with capacitor C 8, the external battery power circuit of described Three-fee-controlled electric energy meter uses an external battery, coordinates DC-DC booster circuit to provide power cut-off recording power supply for electric energy meter, described external battery power supply booster circuit comprises capacitor C 31 ~ capacitor C 33, resistance R 27 ~ resistance R 30, diode D19 ~ diode D21, field effect transistor Q2, triode Q3, step-up DC-DC conversion chip U5 and battery BT1, wherein, the base stage of triode Q3 is connected to the detection of power loss end of single-chip microcomputer CPU (central processing unit) through resistance R 27, and the emitter of triode Q3 is connected to voltage VAA, and the collector of triode Q3 is connected to GND through resistance R 28, the positive pole of battery BT1 is connected to the source S of field effect transistor Q2, the negative pole of battery BT1 is connected to GND, capacitor C 31 is connected in parallel on the two ends of battery BT1, the source S of field effect transistor Q2 is connected to grid G through resistance R 29, the grid G of field effect transistor Q2 is through resistance R 30, and diode D21 and resistance R 28 are connected to GND, the drain D of field effect transistor Q2 is connected to GND through capacitor C 32, the drain D of field effect transistor Q2 is connected to 3 pin of DC-DC conversion chip U5,1 pin of DC-DC conversion chip U5 is connected to GND, 2 pin of DC-DC conversion chip U5 are connected to GND through voltage stabilizing diode D20, capacitor C 33 is connected in parallel on the two ends of voltage stabilizing diode D20,3 pin of DC-DC conversion chip U5 are connected to 2 pin through diode D19, and 2 pin of U5 are external battery voltage output end, the liquid-crystal display section of described Three-fee-controlled electric energy meter adopts IO mouth pulse output booster circuit that operating voltage is provided, described pulse output booster circuit comprises capacitor C 34 ~ capacitor C 36, resistance R 31, compound diode D22, diode D23, wherein, the IO mouth P03 of single-chip microcomputer CPU (central processing unit) is connected to GND through 1 pin and the capacitor C 35 of resistance R 31, compound diode D22, capacitor C 34 is connected between 1 pin and 2 pin of compound diode D22,2 pin of compound diode D22 output voltage V CC_LCD after diode D23, capacitor C 36 is connected in parallel between output voltage V CC_LCD and GND.
2. the Three-fee-controlled electric energy meter based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1, it is characterized in that: described capacitance-resistance voltage reduction circuit comprises voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3, inductance L 1 ~ inductance L 5, resistance R 7 ~ resistance R 9, capacitor C 11 ~ capacitor C 18, rectifier bridge D6, rectifier bridge D7, voltage stabilizing diode D8 and voltage stabilizing diode D9; A phase line is through inductance L 1, and resistance R 7 and capacitor C 11 are connected to 3 pin of rectifier bridge D6, and B phase line is through inductance L 2, resistance R 8 and capacitor C 12 are connected to 4 pin of rectifier bridge D6, C phase line is through inductance L 3, and resistance R 9 and capacitor C 13 are connected to 3 pin of rectifier bridge D7, and N line is connected to 4 pin of rectifier bridge D7; A phase line, B phase line and C phase line are connected to N line through voltage dependent resistor (VDR) RT1 ~ voltage dependent resistor (VDR) RT3 respectively; 1 pin of rectifier bridge D6 is connected with 1 pin of rectifier bridge D7, and 2 pin of rectifier bridge D6 are connected with 2 pin of rectifier bridge D7; Electrochemical capacitor C14 is connected between 1 pin and 2 pin of rectifier bridge D6, and capacitor C 15, capacitor C 16 and zener diode D8 are connected in parallel on capacitor C 14 two ends; 1 pin of rectifier bridge D6 through inductance L 4 be connected to output voltage V+, 2 pin of rectifier bridge D6 through inductance L 5 be connected to output voltage V-, capacitor C 17, capacitor C 18 and voltage stabilizing diode D9 be connected in parallel on output voltage V+and V-between.
3. the Three-fee-controlled electric energy meter based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1, it is characterized in that: described low voltage DC/DC switching power circuit comprises resistance R 1 ~ resistance R 6, capacitor C 1 ~ capacitor C 5, voltage stabilizing diode D1, diode D2, compound diode D3, compound diode D4, field effect transistor Q1, voltage dependent resistor (VDR) RT7, comparer U1 and pickup coil T1; Capacitance-resistance voltage reduction circuit output voltage V-through resistance R 5 and voltage stabilizing diode D1 be connected to capacitance-resistance voltage reduction circuit output voltage V+, capacitor C 1 is connected in parallel on the two ends of voltage stabilizing diode D1; V+ is connected to 3 pin of comparer U1 through resistance R 1, V+ is connected to 4 pin of comparer U1 through resistance R 6,1 pin of comparer U1 is connected to 4 pin through resistance R 3, the 1 foot meridian capacitor C2 of comparer U1 is connected to 2 pin, 3 pin of comparer U1 are connected to 4 pin through resistance R 2,2 pin of comparer U1 are connected to V-through resistance R 5, and 3 pin of comparer U1 are connected to V-through resistance R 4 and resistance R 5, and 5 pin of comparer U1 are connected to V+; 4 pin of comparer U1 are connected to the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is connected to V-through resistance R 5, the drain electrode of field effect transistor Q1 is connected to 3 pin of pickup coil T1, and V+ is connected to 2 pin of pickup coil T1, and V-is connected to 1 pin of pickup coil T1 through resistance R 5 and compound diode D3; Voltage dependent resistor (VDR) RT7 is connected in parallel between the source electrode and drain electrode of field effect transistor Q1; 5 pin of pickup coil T1 are respectively VCON and VAA through compound diode D4 output two-way voltage, and 4 pin of pickup coil T1 are GND, are connected with capacitor C 3 between VCON and GND, are connected with capacitor C 4 between VAA and GND; 7 pin of pickup coil T1 are through diode D2 output voltage V DD_485, and 6 pin of pickup coil T1 are GND_485, are connected with capacitor C 5 between VDD_485 and GND_485.
4. the Three-fee-controlled electric energy meter based on resistance-capacitance depressurization and low voltage DC/DC power supply according to claim 1, is characterized in that: described accessory power supply part switching power circuit comprises composite thermistor RT4, voltage dependent resistor (VDR) RT5, voltage dependent resistor (VDR) RT6, inductance L 6, inductance L 7, capacitor C 19 ~ capacitor C 30, diode D10 ~ diode D18, resistance R 19 ~ resistance R 26, switching power source chip U3, the model of U3 is VIPER17L, three-terminal voltage-stabilizing pipe U4, optocoupler OP3 and pickup coil T2, between accessory power supply L ' and N ', be connected with voltage dependent resistor (VDR) RT6, L ' is connected to 1 pin of composite thermistor RT4, N ' is connected to 3 pin of composite thermistor RT4, capacitor C 19 is connected in parallel between 2 pin and N ' of composite thermistor RT4, 2 pin of composite thermistor RT4 are connected to 4 pin of rectifier bridge D11 through inductance L 6, N ' is connected to 3 pin of rectifier bridge D11 through inductance L 7, voltage dependent resistor (VDR) RT5 is connected between 3 pin and 4 pin of rectifier bridge D11, capacitor C 20 is connected between 1 pin and 2 pin of rectifier bridge D11, 1 pin of rectifier bridge D11 is connected to 1 pin of pickup coil T2, 2 pin of rectifier bridge D11 are connected to 5 pin of pickup coil T2, 1 pin of pickup coil T2 is connected to 2 pin through voltage stabilizing diode D13 and diode D14, 2 pin of pickup coil T2 are connected to 8 pin of switching power source chip U3, 4 pin of pickup coil T2 are connected to 2 pin of U3 through diode D16 and resistance R 19, 5 pin of pickup coil T2 are connected to 1 pin of U3, capacitor C 21, capacitor C 22 and voltage stabilizing diode D10 are connected in parallel between 1 pin and 2 pin of U3, capacitor C 23 is connected between 4 pin and 5 pin of U3,7 pin of pickup coil T2 output voltage after diode D15 is VCC_FK, 6 pin of pickup coil T2 are connected to GND, and capacitor C 26 and capacitor C 27 are connected in parallel between VCC_FK and GND, voltage VCC_FK is connected to 1 pin of optocoupler OP3 through resistance R 20, VCC_FK is connected to 2 pin of optocoupler OP3 through resistance R 24, resistance R 25 and capacitor C 29, and 1 pin of optocoupler OP3 is connected with 2 pin of optocoupler OP3 through resistance R 20, resistance R 21, the plus earth of three-terminal voltage-stabilizing pipe U4, the negative electrode of three-terminal voltage-stabilizing pipe U4 is connected to 2 pin of optocoupler OP3, and the reference utmost point of three-terminal voltage-stabilizing pipe U4 is connected to GND through resistance R 26, 4 pin of optocoupler OP3 are connected to 4 pin of U3, and 3 pin of optocoupler OP3 are connected to 5 pin of U3, the 5 foot meridian capacitor C30 of pickup coil T2 are connected to 6 pin, voltage VCC_FK is output voltage V AA after resistance R 23, is connected with capacitor C 28 between voltage VAA and GND, 12 pin of pickup coil T2 output voltage after diode D18 and resistance R 22 is VCC_485,11 pin of pickup coil T2 are connected to GND_485, capacitor C 24 is connected between the negative electrode and GND_485 of diode D18, voltage stabilizing diode D12 is connected in parallel on capacitor C 24 two ends, voltage stabilizing diode D17 is connected in parallel between voltage VCC_485 and GND_485, is connected with capacitor C 25 between VCC_485 and GND_485 simultaneously.
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| CN201110441255.8A CN102520241B (en) | 2011-12-26 | 2011-12-26 | Three-phase charge-controlled electric energy meter based on resistance-capacitance voltage reduction and low-voltage direct-current/direct-current (DC/DC) power supply |
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| CN103248117B (en) * | 2013-04-16 | 2015-08-05 | 珠海博威电气有限公司 | PT-free intelligent high-voltage switch |
| US9231476B2 (en) * | 2013-05-01 | 2016-01-05 | Texas Instruments Incorporated | Tracking energy consumption using a boost-buck technique |
| CN105467205A (en) * | 2015-05-23 | 2016-04-06 | 李银龙 | Electric energy meter with zero-power RF meter reading |
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| CN106297241B (en) * | 2016-08-24 | 2019-08-20 | 宁波三星医疗电气股份有限公司 | Intelligent electric energy meter GPRS power down reporting system |
| CN106533159A (en) * | 2016-12-16 | 2017-03-22 | 江苏林洋能源股份有限公司 | Resistance-capacitance step-down power supply for three-phase energy meter |
| CN107645268A (en) * | 2017-08-23 | 2018-01-30 | 上海华希软件科技有限公司 | Low-speed electronic vehicle controller power-off protecting circuit |
| CN108599589A (en) * | 2018-06-20 | 2018-09-28 | 瑞纳智能设备股份有限公司 | A kind of isolated low power consumption power supply automatic switchover communication device |
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Denomination of invention: A three-phase cost controlled energy meter based on resistance capacitance voltage reduction and low-voltage DC/DC power supply Granted publication date: 20140702 Pledgee: China Postal Savings Bank Co.,Ltd. Wuhan Branch Pledgor: WUHAN SAN FRAN ELECTRONICS Corp. Registration number: Y2024980022633 |