CN202068337U - Auxiliary power supply for three-phase intelligent ammeter - Google Patents
Auxiliary power supply for three-phase intelligent ammeter Download PDFInfo
- Publication number
- CN202068337U CN202068337U CN2011200433851U CN201120043385U CN202068337U CN 202068337 U CN202068337 U CN 202068337U CN 2011200433851 U CN2011200433851 U CN 2011200433851U CN 201120043385 U CN201120043385 U CN 201120043385U CN 202068337 U CN202068337 U CN 202068337U
- Authority
- CN
- China
- Prior art keywords
- circuit
- capacitor
- joins
- resistance
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
Disclosed is an auxiliary power supply for a three-phase intelligent ammeter. The auxiliary power supply comprises an input protection circuit, an electromagnetic interference filter circuit, a bridge type rectification circuit, a Pi type filter circuit, a clamping protection circuit, and a high-frequency transformer which are sequentially connected. Further comprised are a single-sheet switch power supply connected with the clamping protection circuit and a starting circuit and an oscillation circuit which are connected with a single-sheet switch power supply. The input protection circuit is connected with an AC input end and the output end of the high-frequency transformer is connected with the main road output rectification circuit and the auxiliary road output rectification circuit, wherein the main road output rectification circuit is connected with the single-sheet switch power supply via sequentially connected sampling circuit and optical coupler reactive circuit; and the high-frequency transformer is connected with the single-sheet switch power supply via a short circuit protection circuit. The starting circuit is connected with the output end of the Pi type filter circuit and the oscillation circuit is connected with the output end of the high-frequency transformer. The auxiliary power supply of the utility model features reasonable design, high output voltage precision, strong anti-interference capability, high working efficiency, strong pressure resistance, and high reliability, and is easy to promote.
Description
Technical field
The utility model relates to the intelligent electric meter technical field, especially relates to a kind of three-phase intelligent ammeter accessory power supply.
Background technology
Intelligent grid has obtained extensive concern in the world as the development model of electrical network of future generation, and each government of the world and enterprise constantly increase for setting up the demand that intelligent grid improves power distribution and saves energy.As the leading Utilities Electric Co. of global scale, China national grid company (" Chinese state net ") has been carried out brand-new planning to intelligent grid.Follow the release of Chinese state net new standard, many instrument enterprise also begins to produce the intelligent electric meter that meets state's net new standard requirement one after another.
Intelligent electric meter is a kind of novel ammeter, and functions such as the metering of its current collection energy, information stores and processing, monitoring in real time can show the period and the electricity price of electricity consumption Wave crest and wave trough in one, and it is convenient to have brought to people.Generally, the intelligent ammeter that is used for family is the single-phase intelligent ammeter, and what be used for industry then is the three-phase intelligent ammeter, by it, citizen can recognize oneself every month power consumption, and according to demand, formulate the electricity consumption plan, change unscientific power mode, more saving, more science electricity consumption.Power supply enterprise also can utilize novel ammeter, accurately analyzes citizen's power consumption situation, and the containment stealing electricity phenomenon takes place.The intelligent electric meter power supply is by circuit and accessory power supply power supply, and two kinds of supply power modes should be separate, be independent of each other, and can uninterruptedly change automatically, and the accessory power supply supply power mode is preferential.At present, existing intelligent electric meter accessory power supply can not satisfy the demand that the novel intelligent ammeter uses, in order to improve the design of the intelligent electric meter that meets state's net new standard requirement, further promote the novel intelligent ammeter, need design and the matching used accessory power supply of novel intelligent ammeter.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of three-phase intelligent ammeter accessory power supply is provided, and it is simple in structure, and is reasonable in design, output voltage precision height, ripple are little, antijamming capability is strong, and stand-by power consumption is little, high efficiency, good pressure-resistant performance, safe and reliable, result of use is good, is convenient to promote the use of.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of three-phase intelligent ammeter accessory power supply, it is characterized in that: comprise the input protection circuit that joins successively, electromagnetic interference filter circuit, bridge rectifier, π type filter circuit, clamping protective circuit and high frequency transformer, also comprise the single-chip switching power supply that joins with clamping protective circuit, and the start-up circuit and the oscillating circuit that join with single-chip switching power supply, described input protection circuit and ac input end join, the output termination main road output rectification circuit and the bypass output rectification circuit of described high frequency transformer, described main road output rectification circuit joins by the sample circuit that joins successively and optocoupler feedback circuit and single-chip switching power supply, and described high frequency transformer joins by short-circuit protection circuit and single-chip switching power supply; The output of described start-up circuit and π type filter circuit joins, and the output of described oscillating circuit and high frequency transformer joins.
Above-mentioned a kind of three-phase intelligent ammeter accessory power supply; it is characterized in that: described input protection circuit is by fuse FU; piezo-resistance RV and thermistor RT constitute; described electromagnetic interference filter circuit is made of X capacitor C X1 and CX2 and common mode inductance L1 and L2; an end of coil one joins and the zero line N by fuse FU and ac input end joins among the end of the end of described piezo-resistance RV and X capacitor C X1 and the common mode inductance L1; the live wire L of the other end of described piezo-resistance RV and ac input end and the end of thermistor RT join; an end of coil two joins among the other end of the other end of described thermistor RT and X capacitor C X1 and the common mode inductance L1; among the described common mode inductance L1 among the end of the other end of coil one and X capacitor C X2 and the common mode inductance L2 end of coil one join; among the described common mode inductance L1 among the other end of the other end of coil two and X capacitor C X2 and the common mode inductance L2 end of coil two join; an ac input end of the other end of coil one and bridge rectifier joins among the described common mode inductance L2, and another ac input end of the other end of coil two and bridge rectifier joins among the described common mode inductance L2.
Above-mentioned a kind of three-phase intelligent ammeter accessory power supply, it is characterized in that: described thermistor RT is a negative tempperature coefficient thermistor.
Above-mentioned a kind of three-phase intelligent ammeter accessory power supply, it is characterized in that: described π type filter circuit is made of polar capacitor C1 and C2 and inductance L 3, one end of the positive pole of described polar capacitor C1 and the cathode output end of bridge rectifier and inductance L 3 joins, the negative pole of described polar capacitor C1 and the cathode output end of bridge rectifier joins and the equal ground connection of negative pole of the negative pole of polar capacitor C1 and polar capacitor C2, the positive pole of the other end of described inductance L 3 and polar capacitor C2 joins and is the output of π type filter circuit.
Above-mentioned a kind of three-phase intelligent ammeter accessory power supply; it is characterized in that: described clamping protective circuit is made of resistance R 1, capacitor C 4 and diode D1; one end of described resistance R 1 and an end of capacitor C 4 all join with an end of first primary coil of the output of π type filter circuit and high frequency transformer; the other end of the other end of described resistance R 1 and capacitor C 4 all joins with the negative pole of diode D1, and the other end of first primary coil of the positive pole of described diode D1 and high frequency transformer joins.
Above-mentioned a kind of three-phase intelligent ammeter accessory power supply, it is characterized in that: described single-chip switching power supply is chip OB2354; Described start-up circuit is made of resistance R 2, R3 and R4 serial connection, and the output of an end of described resistance R 2 and π type filter circuit joins, and an end of described resistance R 4 and the pin 2 of chip OB2354 join; Described oscillating circuit is made of resistance R 5 and R7 and capacitor C 5; Described short-circuit protection circuit is made of resistance R 6, diode D2 and polar capacitor C3; One end of described resistance R 5 and the pin 1 of chip OB2354 join, the positive pole of the other end of described resistance R 5 and polar capacitor C3, the pin 2 of chip OB2354 and the negative pole of diode D2 join, one end of described capacitor C 5 and the pin 3 of chip OB2354 join, one end of described resistance R 7 and the pin 4 of chip OB2354 join, the negative pole of described polar capacitor C3, the equal ground connection of the other end of the other end of capacitor C 5 and resistance R 7, one end of the positive pole of described diode D2 and resistance R 6 joins, one end of second primary coil of the other end of described resistance R 6 and high frequency transformer joins, the other end ground connection of second primary coil of described high frequency transformer; The pin 5 of described chip OB2354 and pin 6 join the pin 7 of described chip OB2354 and pin 8 ground connection with the other end of first primary coil of high frequency transformer.
Above-mentioned a kind of three-phase intelligent ammeter accessory power supply, it is characterized in that: described bypass output rectification circuit is by diode D4, inductance L 5, polar capacitor C9 and C10, capacitor C 12, resistance R L1 and capacitor C Y2 constitute, one end of first secondary coil of the positive pole of described diode D4 and high frequency transformer joins, one end of the negative pole of described diode D4 and inductance L 5, the end of the positive pole of polar capacitor C9 and resistance R L1 joins, one end of the positive pole of the other end of described inductance L 5 and polar capacitor C10 and capacitor C 12 joins and is the positive output end of bypass output rectification circuit, the negative pole of described polar capacitor C9, the end of resistance R L1, the negative pole of polar capacitor C10, the end of the other end of capacitor C 12 and capacitor C Y2 all joins with the other end of first secondary coil of high frequency transformer and is the negative output terminal of bypass output rectification circuit, the other end ground connection of described capacitor C Y2.
Above-mentioned a kind of three-phase intelligent ammeter accessory power supply, it is characterized in that: described main road output rectification circuit is by diode D3, inductance L 4, polar capacitor C7 and C8, capacitor C 11, resistance R L and capacitor C Y2 constitute, one end of the second subprime coil of the positive pole of described diode D3 and high frequency transformer joins, one end of the negative pole of described diode D3 and inductance L 4, the end of the positive pole of polar capacitor C7 and resistance R L joins, one end of the positive pole of the other end of described inductance L 4 and polar capacitor C8 and capacitor C 11 joins and is the positive output end of main road output rectification circuit, the negative pole of described polar capacitor C7, the end of resistance R L, the negative pole of polar capacitor C8, the end of the other end of capacitor C 11 and capacitor C Y1 all joins with the other end of the second subprime coil of high frequency transformer and is the negative output terminal of main road output rectification circuit, the other end ground connection of described capacitor C Y1;
Described sample circuit is by resistance R 8, R9, R9 ', R10 and RC, capacitor C 6 and voltage stabilizing chip IC 3 constitute, described optocoupler feedback circuit is made of light-coupled isolation chip IC 2, one end of described resistance R 8 and the positive pole of polar capacitor C7 join, the input pin 1 of the other end of described resistance R 8 and light-coupled isolation chip IC 2 joins, one end of described resistance R 9 and an end of resistance R 9 ' all join with the negative output terminal of main road output rectification circuit, one end of described resistance R 10 and the positive output end of main road output rectification circuit join, the other end of described resistance R 9, the other end of the other end of resistance R 9 ' and resistance R 10 all joins with the end of resistance R C and the pin 1 of voltage stabilizing chip IC 3, the end of described resistance R C and an end of capacitor C 6 join, the input pin 2 of the other end of described capacitor C 6 and light-coupled isolation chip IC 2 and the pin 3 of voltage stabilizing chip IC 3 join, the pin 2 of described voltage stabilizing chip IC 3 joins with the negative output terminal of main road output rectification circuit, output pin 3 ground connection of described light-coupled isolation chip IC 2, the output pin 4 of described light-coupled isolation chip IC 2 joins with the input of single-chip switching power supply.
Above-mentioned a kind of three-phase intelligent ammeter accessory power supply is characterized in that: described high frequency transformer is reaction type high frequency transformer T1.
The utility model compared with prior art has the following advantages:
1, simple in structure, reasonable in design: input voltage of the present utility model is 85-264V, exchanges the wide region input, and circuit structure is simple and reasonable in design.
2, output voltage precision height, ripple are little, antijamming capability is strong: the output voltage precision of main road output rectification circuit is ± 5%, the output voltage precision of bypass output rectification circuit is ± 10%, the output ripple plus noise is not more than 100mV, and antijamming capability satisfies the requirement of GB 17626.5-2008.
3, stand-by power consumption is little, high efficiency: operating efficiency is not less than 70%.
4, good pressure-resistant performance, safe and reliable: input is to isolating withstand voltage AC4000V, frequency 50Hz between output, the output, electric current is less than 5mA, at least 1 minute, the MTBF of product can reach 50,000 hours, environment temperature is-25 ℃-55 ℃ during work, and ambient humidity, light and temperature is not less than 95%, dewfall gets final product during work, and storing temperature is-40 ℃-70 ℃; Have main road short-circuit protection, self-healing function.
5, result of use is good, is convenient to promote the use of: the utility model meets state's net new standard, satisfies the demand that the novel intelligent ammeter uses, help further promoting the novel intelligent ammeter, help building full intelligent grid, further saves energy, result of use is good, is convenient to promote the use of.
In sum, the utility model is simple in structure, and is reasonable in design, and output voltage precision height, ripple are little, antijamming capability is strong, stand-by power consumption is little, high efficiency, good pressure-resistant performance, safe and reliable, solved the corresponding problem with the novel intelligent ammeter that meets state's net new standard, result of use is good, is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of a kind of execution mode of the utility model.
Description of reference numerals:
The 1-input protection circuit; The 2-electromagnetic interference filter circuit; The 3-bridge rectifier;
4-π type filter circuit; The 5-clamping protective circuit; The 6-high frequency transformer;
The 7-single-chip switching power supply; The 8-start-up circuit; The 9-oscillating circuit;
10-main road output rectified current 11-bypass output rectified current 12-sample circuit;
The road; The road;
13-optocoupler feedback circuit; The 14-short-circuit protection circuit; The 15-ac input end.
Embodiment
As shown in Figure 1, the utility model comprises the input protection circuit 1 that joins successively, electromagnetic interference filter circuit 2, bridge rectifier 3, π type filter circuit 4, clamping protective circuit 5 and high frequency transformer 6, also comprise the single-chip switching power supply 7 that joins with clamping protective circuit 5, and the start-up circuit 8 and the oscillating circuit 9 that join with single-chip switching power supply 7, described input protection circuit 1 joins with ac input end 15, the output termination main road output rectification circuit 10 and the bypass output rectification circuit 11 of described high frequency transformer 6, described main road output rectification circuit 10 joins with single-chip switching power supply 7 by sample circuit 12 and the optocoupler feedback circuit 13 that joins successively, and described high frequency transformer 6 joins by short-circuit protection circuit 14 and single-chip switching power supply 7; Described start-up circuit 8 joins with the output of π type filter circuit 4, and described oscillating circuit 9 joins with the output of high frequency transformer 6.
In conjunction with Fig. 2; in the present embodiment; described input protection circuit 1 is by fuse FU; piezo-resistance RV and thermistor RT constitute; described electromagnetic interference filter circuit 2 is made of X capacitor C X1 and CX2 and common mode inductance L1 and L2; an end of coil one joins and the zero line N by fuse FU and ac input end 15 joins among the end of the end of described piezo-resistance RV and X capacitor C X1 and the common mode inductance L1; the live wire L of the other end of described piezo-resistance RV and ac input end 15 and the end of thermistor RT join; an end of coil two joins among the other end of the other end of described thermistor RT and X capacitor C X1 and the common mode inductance L1; among the described common mode inductance L1 among the end of the other end of coil one and X capacitor C X2 and the common mode inductance L2 end of coil one join; among the described common mode inductance L1 among the other end of the other end of coil two and X capacitor C X2 and the common mode inductance L2 end of coil two join; an ac input end of the other end of coil one and bridge rectifier 3 joins among the described common mode inductance L2, and another ac input end of the other end of coil two and bridge rectifier 3 joins among the described common mode inductance L2.Described thermistor RT is a negative tempperature coefficient thermistor.
In conjunction with Fig. 2, in the present embodiment, described π type filter circuit 4 is made of polar capacitor C1 and C2 and inductance L 3, one end of the cathode output end of the positive pole of described polar capacitor C1 and bridge rectifier 3 and inductance L 3 joins, the cathode output end of the negative pole of described polar capacitor C1 and bridge rectifier 3 joins and the negative pole of polar capacitor C1 and the equal ground connection of negative pole of polar capacitor C2, and the positive pole of the other end of described inductance L 3 and polar capacitor C2 joins and is the output of π type filter circuit 4.Described clamping protective circuit 5 is made of resistance R 1, capacitor C 4 and diode D1; one end of described resistance R 1 and an end of capacitor C 4 all join with an end of first primary coil of the output of π type filter circuit 4 and high frequency transformer 6; the other end of the other end of described resistance R 1 and capacitor C 4 all joins with the negative pole of diode D1, and the other end of first primary coil of the positive pole of described diode D1 and high frequency transformer 6 joins.
In conjunction with Fig. 2, in the present embodiment, described single-chip switching power supply 7 is chip OB2354; Described start-up circuit 8 is made of resistance R 2, R3 and R4 serial connection, and the output of an end of described resistance R 2 and π type filter circuit 4 joins, and an end of described resistance R 4 and the pin 2 of chip OB2354 join; Described oscillating circuit 9 is made of resistance R 5 and R7 and capacitor C 5; Described short-circuit protection circuit 14 is made of resistance R 6, diode D2 and polar capacitor C3; One end of described resistance R 5 and the pin 1 of chip OB2354 join, the positive pole of the other end of described resistance R 5 and polar capacitor C3, the pin 2 of chip OB2354 and the negative pole of diode D2 join, one end of described capacitor C 5 and the pin 3 of chip OB2354 join, one end of described resistance R 7 and the pin 4 of chip OB2354 join, the negative pole of described polar capacitor C3, the equal ground connection of the other end of the other end of capacitor C 5 and resistance R 7, one end of the positive pole of described diode D2 and resistance R 6 joins, one end of second primary coil of the other end of described resistance R 6 and high frequency transformer 6 joins, the other end ground connection of second primary coil of described high frequency transformer 6; The pin 5 of described chip OB2354 and pin 6 join the pin 7 of described chip OB2354 and pin 8 ground connection with the other end of first primary coil of high frequency transformer 6.
In conjunction with Fig. 2, in the present embodiment, described bypass output rectification circuit 11 is by diode D4, inductance L 5, polar capacitor C9 and C10, capacitor C 12, resistance R L1 and capacitor C Y2 constitute, one end of first secondary coil of the positive pole of described diode D4 and high frequency transformer 6 joins, one end of the negative pole of described diode D4 and inductance L 5, the end of the positive pole of polar capacitor C9 and resistance R L1 joins, one end of the positive pole of the other end of described inductance L 5 and polar capacitor C10 and capacitor C 12 joins and is the positive output end of bypass output rectification circuit 11, the negative pole of described polar capacitor C9, the end of resistance R L1, the negative pole of polar capacitor C10, the end of the other end of capacitor C 12 and capacitor C Y2 all joins with the other end of first secondary coil of high frequency transformer 6 and is the negative output terminal of bypass output rectification circuit 11, the other end ground connection of described capacitor C Y2.
In conjunction with Fig. 2, in the present embodiment, described main road output rectification circuit 10 is by diode D3, inductance L 4, polar capacitor C7 and C8, capacitor C 11, resistance R L and capacitor C Y2 constitute, one end of the second subprime coil of the positive pole of described diode D3 and high frequency transformer 6 joins, one end of the negative pole of described diode D3 and inductance L 4, the end of the positive pole of polar capacitor C7 and resistance R L joins, one end of the positive pole of the other end of described inductance L 4 and polar capacitor C8 and capacitor C 11 joins and is the positive output end of main road output rectification circuit 10, the negative pole of described polar capacitor C7, the end of resistance R L, the negative pole of polar capacitor C8, the end of the other end of capacitor C 11 and capacitor C Y1 all joins with the other end of the second subprime coil of high frequency transformer 6 and is the negative output terminal of main road output rectification circuit 10, the other end ground connection of described capacitor C Y1; Described sample circuit 12 is by resistance R 8, R9, R9 ', R10 and RC, capacitor C 6 and voltage stabilizing chip IC 3 constitute, described optocoupler feedback circuit 13 is made of light-coupled isolation chip IC 2, one end of described resistance R 8 and the positive pole of polar capacitor C7 join, the input pin 1 of the other end of described resistance R 8 and light-coupled isolation chip IC 2 joins, one end of described resistance R 9 and an end of resistance R 9 ' all join with the negative output terminal of main road output rectification circuit 10, one end of described resistance R 10 and the positive output end of main road output rectification circuit 10 join, the other end of described resistance R 9, the other end of the other end of resistance R 9 ' and resistance R 10 all joins with the end of resistance R C and the pin 1 of voltage stabilizing chip IC 3, the end of described resistance R C and an end of capacitor C 6 join, the input pin 2 of the other end of described capacitor C 6 and light-coupled isolation chip IC 2 and the pin 3 of voltage stabilizing chip IC 3 join, the pin 2 of described voltage stabilizing chip IC 3 joins with the negative output terminal of main road output rectification circuit 10, output pin 3 ground connection of described light-coupled isolation chip IC 2, the output pin 4 of described light-coupled isolation chip IC 2 joins with the input of single-chip switching power supply 7.Described high frequency transformer 6 is reaction type high frequency transformer T1.
The operation principle of the present utility model and the course of work are: the alternating current of 85V-264V obtains high direct voltage through input protection circuit 1, electromagnetic interference filter circuit 2, bridge rectifier 3, π type filter circuit 4 and clamping protective circuit 5 backs, be connected to an end of high frequency transformer 6 first primary coils, the other end of high frequency transformer 6 first primary coils is connected to the drain electrode of the MOSFET in the single-chip switching power supply 7; Wherein, two devices of fuse FU in the input protection circuit 1 and piezo-resistance RV play the effect that prevents lightning surge, impulse current when thermistor RT can make start is limited in the rated range, the effect of electromagnetic interference filter circuit 2 is mainly and prevents that burst of pulses from disturbing, and bridge rectifier 3 becomes direct current with AC rectification; The effect of clamping protective circuit 5 is that the peak voltage that when MOSFET turn-offs high frequency transformer 6 leakage inductances is produced is limited in the safe range, and the drain electrode of MOSFET is played a protective role; As bypass output, export as main road behind over commutation by the output voltage of the second subprime coil of high frequency transformer 6 behind over commutation for the output voltage of first secondary coil of high frequency transformer 6.Wherein, capacitor C Y1 is the electric capacity between high pressure ground and the main road ground, and capacitor C Y2 is the electric capacity between high pressure ground and the bypass ground, is used to the interference that prevents that power supply is external.The effect of short-circuit protection circuit 14 is to make VCC voltage raise rapidly when power supply short circuit, and chip quits work when voltage reaches certain value, makes power supply play the effect of short-circuit protection.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection range of technical solutions of the utility model according to the utility model technical spirit.
Claims (9)
1. three-phase intelligent ammeter accessory power supply, it is characterized in that: comprise the input protection circuit (1) that joins successively, electromagnetic interference filter circuit (2), bridge rectifier (3), π type filter circuit (4), clamping protective circuit (5) and high frequency transformer (6), also comprise the single-chip switching power supply (7) that joins with clamping protective circuit (5), and the start-up circuit (8) and the oscillating circuit (9) that join with single-chip switching power supply (7), described input protection circuit (1) joins with ac input end (15), the output termination main road output rectification circuit (10) of described high frequency transformer (6) and bypass output rectification circuit (11), described main road output rectification circuit (10) joins with single-chip switching power supply (7) by sample circuit (12) and the optocoupler feedback circuit (13) that joins successively, and described high frequency transformer (6) joins by short-circuit protection circuit (14) and single-chip switching power supply (7); Described start-up circuit (8) joins with the output of π type filter circuit (4), and described oscillating circuit (9) joins with the output of high frequency transformer (6).
2. according to the described a kind of three-phase intelligent ammeter accessory power supply of claim 1; it is characterized in that: described input protection circuit (1) is by fuse FU; piezo-resistance RV and thermistor RT constitute; described electromagnetic interference filter circuit (2) is made of X capacitor C X1 and CX2 and common mode inductance L1 and L2; an end of coil one joins and the zero line N by fuse FU and ac input end (15) joins among the end of the end of described piezo-resistance RV and X capacitor C X1 and the common mode inductance L1; the live wire L of the other end of described piezo-resistance RV and ac input end (15) and the end of thermistor RT join; an end of coil two joins among the other end of the other end of described thermistor RT and X capacitor C X1 and the common mode inductance L1; among the described common mode inductance L1 among the end of the other end of coil one and X capacitor C X2 and the common mode inductance L2 end of coil one join; among the described common mode inductance L1 among the other end of the other end of coil two and X capacitor C X2 and the common mode inductance L2 end of coil two join; an ac input end of the other end of coil one and bridge rectifier (3) joins among the described common mode inductance L2, and another ac input end of the other end of coil two and bridge rectifier (3) joins among the described common mode inductance L2.
3. according to the described a kind of three-phase intelligent ammeter accessory power supply of claim 2, it is characterized in that: described thermistor RT is a negative tempperature coefficient thermistor.
4. according to the described a kind of three-phase intelligent ammeter accessory power supply of claim 1, it is characterized in that: described π type filter circuit (4) is made of polar capacitor C1 and C2 and inductance L 3, the cathode output end of the positive pole of described polar capacitor C1 and bridge rectifier (3) and an end of inductance L 3 join, the cathode output end of the negative pole of described polar capacitor C1 and bridge rectifier (3) joins and the negative pole of polar capacitor C1 and the equal ground connection of negative pole of polar capacitor C2, and the positive pole of the other end of described inductance L 3 and polar capacitor C2 joins and is the output of π type filter circuit (4).
5. according to the described a kind of three-phase intelligent ammeter accessory power supply of claim 1; it is characterized in that: described clamping protective circuit (5) is made of resistance R 1, capacitor C 4 and diode D1; one end of described resistance R 1 and an end of capacitor C 4 all join with an end of first primary coil of the output of π type filter circuit (4) and high frequency transformer (6); the other end of the other end of described resistance R 1 and capacitor C 4 all joins with the negative pole of diode D1, and the other end of first primary coil of the positive pole of described diode D1 and high frequency transformer (6) joins.
6. according to the described a kind of three-phase intelligent ammeter accessory power supply of claim 1, it is characterized in that: described single-chip switching power supply (7) is chip OB2354; Described start-up circuit (8) is made of resistance R 2, R3 and R4 serial connection, and the output of an end of described resistance R 2 and π type filter circuit (4) joins, and an end of described resistance R 4 and the pin 2 of chip OB2354 join; Described oscillating circuit (9) is made of resistance R 5 and R7 and capacitor C 5; Described short-circuit protection circuit (14) is made of resistance R 6, diode D2 and polar capacitor C3; One end of described resistance R 5 and the pin 1 of chip OB2354 join, the positive pole of the other end of described resistance R 5 and polar capacitor C3, the pin 2 of chip OB2354 and the negative pole of diode D2 join, one end of described capacitor C 5 and the pin 3 of chip OB2354 join, one end of described resistance R 7 and the pin 4 of chip OB2354 join, the negative pole of described polar capacitor C 3, the equal ground connection of the other end of the other end of capacitor C 5 and resistance R 7, one end of the positive pole of described diode D2 and resistance R 6 joins, one end of second primary coil of the other end of described resistance R 6 and high frequency transformer (6) joins, the other end ground connection of second primary coil of described high frequency transformer (6); The pin 5 of described chip OB2354 and pin 6 join the pin 7 of described chip OB2354 and pin 8 ground connection with the other end of first primary coil of high frequency transformer (6).
7. according to the described a kind of three-phase intelligent ammeter accessory power supply of claim 1, it is characterized in that: described bypass output rectification circuit (11) is by diode D4, inductance L 5, polar capacitor C9 and C10, capacitor C 12, resistance R L1 and capacitor C Y2 constitute, one end of first secondary coil of the positive pole of described diode D4 and high frequency transformer (6) joins, one end of the negative pole of described diode D4 and inductance L 5, the end of the positive pole of polar capacitor C9 and resistance R L1 joins, one end of the positive pole of the other end of described inductance L 5 and polar capacitor C10 and capacitor C 12 joins and is the positive output end of bypass output rectification circuit (11), the negative pole of described polar capacitor C9, the end of resistance R L1, the negative pole of polar capacitor C10, the end of the other end of capacitor C 12 and capacitor C Y2 all joins with the other end of first secondary coil of high frequency transformer (6) and is the negative output terminal of bypass output rectification circuit (11), the other end ground connection of described capacitor C Y2.
8. according to the described a kind of three-phase intelligent ammeter accessory power supply of claim 1, it is characterized in that: described main road output rectification circuit (10) is by diode D3, inductance L 4, polar capacitor C7 and C8, capacitor C 11, resistance R L and capacitor C Y2 constitute, one end of the second subprime coil of the positive pole of described diode D3 and high frequency transformer (6) joins, one end of the negative pole of described diode D3 and inductance L 4, the end of the positive pole of polar capacitor C7 and resistance R L joins, one end of the positive pole of the other end of described inductance L 4 and polar capacitor C8 and capacitor C 11 joins and is the positive output end of main road output rectification circuit (10), the negative pole of described polar capacitor C7, the end of resistance R L, the negative pole of polar capacitor C8, the end of the other end of capacitor C 11 and capacitor C Y1 all joins with the other end of the second subprime coil of high frequency transformer (6) and is the negative output terminal of main road output rectification circuit (10), the other end ground connection of described capacitor C Y1;
Described sample circuit (12) is by resistance R 8, R9, R9 ', R10 and RC, capacitor C 6 and voltage stabilizing chip IC 3 constitute, described optocoupler feedback circuit (13) is made of light-coupled isolation chip IC 2, one end of described resistance R 8 and the positive pole of polar capacitor C7 join, the input pin 1 of the other end of described resistance R 8 and light-coupled isolation chip IC 2 joins, one end of described resistance R 9 and an end of resistance R 9 ' all join with the negative output terminal of main road output rectification circuit (10), the positive output end of one end of described resistance R 10 and main road output rectification circuit (10) joins, the other end of described resistance R 9, the other end of the other end of resistance R 9 ' and resistance R 10 all joins with the end of resistance R C and the pin 1 of voltage stabilizing chip IC 3, the end of described resistance R C and an end of capacitor C 6 join, the input pin 2 of the other end of described capacitor C 6 and light-coupled isolation chip IC 2 and the pin 3 of voltage stabilizing chip IC 3 join, the pin 2 of described voltage stabilizing chip IC 3 joins with the negative output terminal of main road output rectification circuit (10), output pin 3 ground connection of described light-coupled isolation chip IC 2, the output pin 4 of described light-coupled isolation chip IC 2 joins with the input of single-chip switching power supply (7).
9. according to the described a kind of three-phase intelligent ammeter accessory power supply of arbitrary claim among the claim 1-8, it is characterized in that: described high frequency transformer (6) is reaction type high frequency transformer T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200433851U CN202068337U (en) | 2011-02-21 | 2011-02-21 | Auxiliary power supply for three-phase intelligent ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200433851U CN202068337U (en) | 2011-02-21 | 2011-02-21 | Auxiliary power supply for three-phase intelligent ammeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202068337U true CN202068337U (en) | 2011-12-07 |
Family
ID=45062188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200433851U Expired - Fee Related CN202068337U (en) | 2011-02-21 | 2011-02-21 | Auxiliary power supply for three-phase intelligent ammeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202068337U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242616A (en) * | 2014-10-15 | 2014-12-24 | 国家电网公司 | Power supply circuit of multi-functional electric energy meter |
| CN105052025A (en) * | 2013-02-13 | 2015-11-11 | 法雷奥电机控制系统公司 | Device and method for filtering electromagnetic interference |
| CN106487081A (en) * | 2016-12-21 | 2017-03-08 | 江西佰仕通电子科技有限公司 | Mains charger circuit |
| CN106655815A (en) * | 2016-12-21 | 2017-05-10 | 江西佰仕通电子科技有限公司 | Synchronous rectification circuit |
| CN107425740A (en) * | 2017-09-22 | 2017-12-01 | 武汉盛帆电子股份有限公司 | A kind of high pressure apparent source and high pressure gauge |
| CN110380612A (en) * | 2019-07-08 | 2019-10-25 | 广州市凯辉电子有限公司 | A kind of Switching Power Supply of stable output |
| CN110545043A (en) * | 2019-07-08 | 2019-12-06 | 广州市凯辉电子有限公司 | Switching power supply and control circuit thereof |
-
2011
- 2011-02-21 CN CN2011200433851U patent/CN202068337U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105052025A (en) * | 2013-02-13 | 2015-11-11 | 法雷奥电机控制系统公司 | Device and method for filtering electromagnetic interference |
| CN105052025B (en) * | 2013-02-13 | 2019-07-30 | 法雷奥电机控制系统公司 | For filtering out the device and method of electromagnetic interference |
| CN104242616A (en) * | 2014-10-15 | 2014-12-24 | 国家电网公司 | Power supply circuit of multi-functional electric energy meter |
| CN106487081A (en) * | 2016-12-21 | 2017-03-08 | 江西佰仕通电子科技有限公司 | Mains charger circuit |
| CN106655815A (en) * | 2016-12-21 | 2017-05-10 | 江西佰仕通电子科技有限公司 | Synchronous rectification circuit |
| CN107425740A (en) * | 2017-09-22 | 2017-12-01 | 武汉盛帆电子股份有限公司 | A kind of high pressure apparent source and high pressure gauge |
| CN110380612A (en) * | 2019-07-08 | 2019-10-25 | 广州市凯辉电子有限公司 | A kind of Switching Power Supply of stable output |
| CN110545043A (en) * | 2019-07-08 | 2019-12-06 | 广州市凯辉电子有限公司 | Switching power supply and control circuit thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202068337U (en) | Auxiliary power supply for three-phase intelligent ammeter | |
| CN204517680U (en) | A kind of interchange inputs doubleway output DC-stabilized circuit | |
| CN204068405U (en) | The earth leakage protective DC power-supply system of a kind of band | |
| CN204761146U (en) | Bimodulus power supply | |
| CN102694477B (en) | High-voltage alternating current power supply, low-voltage alternating current power supply and low-voltage direct current power supply common-base circuit | |
| CN204103770U (en) | A kind of mobile phone small-power switching power-supply circuit | |
| CN205882809U (en) | Charger circuit | |
| CN201466734U (en) | Intelligent phase control type low-voltage power capacitor | |
| CN103036437B (en) | Distribution network terminal power supply device | |
| CN109194103A (en) | A kind of variable-frequency power sources input harmonics suppressing method | |
| CN102810986B (en) | A kind of series topology LED switch power circuit | |
| CN202178711U (en) | Dual supply output circuit possessing ultralow no-load power consumption and high efficiency under low load | |
| CN204030975U (en) | Single-phase and automatic three-phase switching high voltage source | |
| CN201845300U (en) | Zero stand-by power consumption computer power | |
| CN201336223Y (en) | Intelligent capacitor with function of harmonic protection | |
| CN204361923U (en) | With the Switching Power Supply of Multiple isolated outputs | |
| CN202663316U (en) | Circuit with three common-grounded power supplies of high voltage alternating current, low voltage alternating current and low voltage direct current | |
| CN202930939U (en) | Intelligent type three phase electricity-saving appliance | |
| CN209488241U (en) | Small-sized quick charger | |
| CN203313064U (en) | High-frequency switching power supply module | |
| CN203261244U (en) | High-frequency switching power supply module | |
| CN202856681U (en) | Control device applied to industrial frequency transformer | |
| CN202475261U (en) | Power supply circuit of motor protector | |
| CN202652055U (en) | Electrolytic capacitor charging circuit | |
| CN205901603U (en) | Multi -functional variable frequency power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20140221 |