CN106787833B - Power supply circuit with DC/DC conversion module - Google Patents
Power supply circuit with DC/DC conversion module Download PDFInfo
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- CN106787833B CN106787833B CN201611145187.XA CN201611145187A CN106787833B CN 106787833 B CN106787833 B CN 106787833B CN 201611145187 A CN201611145187 A CN 201611145187A CN 106787833 B CN106787833 B CN 106787833B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 68
- 239000003990 capacitor Substances 0.000 claims abstract description 96
- 102000003922 Calcium Channels Human genes 0.000 claims description 15
- 108090000312 Calcium Channels Proteins 0.000 claims description 15
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 101100421917 Arabidopsis thaliana SOT6 gene Proteins 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 238000013016 damping Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The power supply circuit with the DC/DC conversion module is characterized by comprising a transformer, a rectifying circuit and the DC/DC conversion module, wherein the transformer, the rectifying circuit and the DC/DC conversion module are sequentially connected, the DC/DC conversion module comprises a first conversion circuit, a second conversion circuit and a third conversion circuit, and the first conversion circuit comprises an amplifier chip IC4, a resistor R110, a resistor R111, a capacitor C8 and an inductor L2. The power supply circuit of the scheme provides a DC/DC conversion circuit which is converted into various working voltages to supply power for circuits of different functional modules of the electric energy meter; the power supply system of the power supply circuit has high stability and strong anti-interference capability.
Description
Technical Field
The invention belongs to the technical field of electronic ammeter, and particularly relates to a power supply circuit with a DC/DC conversion module on an electric energy meter.
Background
The common household electric energy meter has single functions, so that the occupied area of a PCB (printed circuit board) is reduced, the wiring framework in the electric energy meter is reduced, the power circuit structure is simple, the stability and the anti-interference capability are poor, and the quality of the electronic electric energy meter is directly determined by the quality of a power system. In addition, the electric energy meter is provided with a plurality of functional module circuits, and a special power supply conversion circuit is required to be arranged. At present, a conversion circuit on the electric energy meter has the problems of poor system stability and electromagnetic mutual interference, influences the service performance of the electric energy meter, and causes potential safety hazards in the use process of the electric energy meter due to unstable power supply voltage.
Disclosure of Invention
The invention aims to solve the problems of electromagnetic interference and poor stability of a power circuit in the prior electric energy meter, and provides the power circuit with a DC/DC conversion module.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the power supply circuit with the DC/DC conversion module comprises a transformer, a rectifying circuit and the DC/DC conversion module, wherein the transformer, the rectifying circuit and the DC/DC conversion module are sequentially connected, the DC/DC conversion module comprises a first conversion circuit, a second conversion circuit and a third conversion circuit, the first conversion circuit comprises an amplifier chip IC4, a resistor R110, a resistor R111, a capacitor C8 and an inductor L2, the voltage VDCC at the front end of the circuit is sequentially connected with the resistor R110 and the 4 th pin of the amplifier chip IC4, the input end of the resistor R110 is sequentially connected with one end of a capacitor C52, the other end of the capacitor C52 is grounded, the node between the 6 th pin of the amplifier chip IC4 and the negative electrode of a diode D7 is sequentially connected with the node between the capacitor C8 and the inductor L2, the 1 st pin of the amplifier chip IC4 is sequentially grounded with the resistor R111, the capacitor C8, the input end of the inductor L2 is sequentially connected with the resistor R111, the output end of the diode D7, the positive electrode of the diode R113 is connected with the positive electrode of the resistor R113, and the positive electrode of the resistor R113 is connected between the output end of the diode R7 and the positive electrode of the resistor R112. The power supply adopting the power supply module has stable working performance.
The power supply DC/DC conversion module converts the front-end voltage VDCC into a corresponding specific direct-current voltage to supply power for the following circuit modules. The first working voltage VDD converted by the first conversion circuit is used for supplying power to a load switch circuit of the electric energy meter.
Further, the first conversion circuit further comprises an electrolytic capacitor EC2 and a capacitor C50, one end of a circuit formed by parallel connection of the electrolytic capacitor EC2 and the capacitor C50 is connected with a node between the inductor L2 and the resistor R112, the other end of a circuit formed by parallel connection of the electrolytic capacitor EC2 and the capacitor C50 is grounded, and the anode of the electrolytic capacitor EC2 is connected with the resistor R112. The capacitor C50 is a damping capacitor of EC2, and functions as decoupling filter together with the electrolytic capacitor EC 2.
Further, the second conversion circuit includes a resistor R114, a resistor R115, an amplifier chip IC5, a resistor R117, a resistor C43, an inductor L1, a resistor R112, a resistor R113, and a diode D7, where the front end voltage VDCC is sequentially connected to the resistor R114, the resistor R115, and the 4 th pin of the amplifier chip IC5, and a node between the resistor R114 and the 5 th pin of the amplifier chip IC5 is connected to one end of the capacitor C62, and the other end of the capacitor C62 is grounded; the node between the 6 th pin of the amplifier chip IC5 and the negative electrode of the diode D10 is connected with the node between the capacitor C43 and the inductor L1, the 1 st pin of the amplifier chip IC4 is sequentially connected with the resistor R117, the capacitor C43 and the inductor L1, the resistors R118 and R119 are connected in series between the inductor L1 and the positive electrode of the diode D10, the 2 nd pin GND of the amplifier chip IC5 is grounded, the node between the resistor R118 and the resistor R119 is connected with the 3 rd pin of the amplifier chip IC5, the resistor R119, the capacitor C46 and the diode D10 are grounded, and the node between the inductor L1 and the resistor R112 outputs a second working voltage ZB12V. The second working voltage ZB12V converted by the second conversion circuit is used for supplying power to the carrier communication interface circuit of the electric energy meter.
Further, one end of the resistor R116 and one end of the inductor C61 are externally connected between the resistor R115 and the amplifier chip IC5, and the other end of the resistor R116 and the other end of the inductor C61 are grounded. R116 is bias resistance, and C61 filters.
Furthermore, the second conversion circuit includes an electrolytic capacitor EC8 and a capacitor C46, one end of a circuit formed by connecting the electrolytic capacitor EC8 and the capacitor C46 in parallel is connected with the resistor R118, the other end is connected with the resistor R119, the positive electrode of the electrolytic capacitor EC8 is connected with the resistor R118, and the node of the negative electrode of the electrolytic capacitor EC8, the capacitor C46 and the resistor R119 is grounded. The capacitor C46 is a damping capacitor of the EC8, and functions as decoupling filter together with the electrolytic capacitor EC 8.
Further, the third conversion circuit includes a voltage stabilizing chip IC3, the front end voltage VDCC is connected to the pin 3 of the input end of the voltage stabilizing chip IC3, the pin 2 of the ground end of the voltage stabilizing chip IC3 is grounded, and the pin 1 of the output end of the voltage stabilizing chip IC3 outputs the third working voltage VDD. The third operating voltage VDD supplies power to the CPU card socket circuit.
Further, the voltage stabilizing chip IC3 is of a type of 78L05SOT-89 long electricity.
Further, the amplifier chip IC4 and the amplifier chip IC5 are of the LV2842 XLVLDDCR SOT6 type. The light load high efficiency is realized, the overcurrent protection can be realized, and the accurate enabling control function can be realized.
Further, the rectifying circuit comprises a rectifying bridge BD1 and an electrolytic capacitor EC1, the 6 pin and the 7 pin of the third coil are respectively connected with the 3 pin and the 4 pin of the input end of the rectifying bridge BD1, the positive electrode of the output end of the rectifying bridge BD1 is connected with the positive electrode of the electrolytic capacitor EC1, the negative electrode of the output end of the rectifying bridge BD1 is connected with the negative electrode of the electrolytic capacitor EC1, the node between the positive electrode of the output end of the rectifying bridge BD1 and the positive electrode of the electrolytic capacitor EC1 outputs a front end voltage VDCC, and the node between the negative electrode of the output end of the rectifying bridge BD1 and the negative electrode of the electrolytic capacitor EC1 is grounded.
Further, the power supply circuit further comprises a power supply protection circuit, the power supply protection circuit comprises a piezoresistor RR1, a thermistor RT1, a piezoresistor RR1 connected in series between a live wire L line and a zero line N line, two ends of the piezoresistor RR1 are respectively connected with a 5 pin and a 1 pin of a primary coil of the transformer, the thermistor RT1 is further connected between the piezoresistor RR1 and the 1 pin of the primary coil, and a piezoresistor Ra connected with the piezoresistor RR1 in parallel is further arranged between the 5 pin and the 1 pin of the primary coil of the transformer. The thermistor RT1 can also form three-leg components with the voltage dependent resistor Ra with the resistance value smaller than that of the thermistor RT1, and forms a more stable power protection circuit with the voltage dependent resistor RR 1. Particularly, the transformer and the whole power supply circuit can be effectively protected against lightning protection and zero line grounding or zero line non-connection.
Compared with the prior art, the invention has the beneficial effects that: the power supply circuit of the scheme provides a plurality of DC/DC conversion modes for supplying power to circuits of different functional modules of the electric energy meter; the power supply system of the power supply circuit has high stability and strong anti-interference capability.
Drawings
Fig. 1 is a circuit diagram of a power supply DC/DC conversion module;
fig. 2 is a circuit diagram of a front-end voltage output portion of the power supply circuit.
Detailed Description
The technical scheme of the invention is further described and illustrated by the following specific examples.
As shown in fig. 1-2, the power supply circuit with the DC/DC conversion module comprises a transformer, a rectifying circuit and the DC/DC conversion module, wherein the transformer, the rectifying circuit and the DC/DC conversion module are sequentially connected, and the DC/DC conversion module comprises a first conversion circuit, a second conversion circuit and a third conversion circuit.
The principle of the whole power supply circuit is as follows: the power supply voltage of the live wire zero line is 220VAC, the power supply voltage is transformed by a transformer and then is output to a rectifying circuit, the rectifying circuit outputs front-end voltage VDCC, and the front-end voltage VDCC is converted into working voltages applicable to an electric energy meter to realize different functional modules by a DC/DC conversion module.
The first conversion circuit comprises an amplifier chip IC4, a resistor R110, a resistor R111, a capacitor C8 and an inductor L2, wherein the front end voltage VDCC of the circuit is sequentially connected with the resistor R110 and the 4 th pin of the amplifier chip IC4, the node between the input end of the resistor R110 and the 5 th pin of the amplifier chip IC4 is connected with one end of a capacitor C52, the other end of the capacitor C52 is grounded, the node between the 6 th pin of the amplifier chip IC4 and the cathode of a diode D7 is connected with the node between the capacitor C8 and the inductor L2, the 1 st pin of the amplifier chip IC4 is connected with the resistor R111, the capacitor C8 and the input end of the inductor L2 in sequence, the 2 nd pin of the amplifier chip IC4 is grounded, the input end of the inductor L2 is connected with the cathode of a diode D7, the node between the anode of the diode D7 is connected with the resistor R112 and the resistor R113 in series, the node between the resistor R112 and the resistor R113 is connected with the 3 rd pin of the amplifier chip IC4, and the node between the anode of the diode D7 and the inductor C8 and the output end of the inductor L2 is connected with the output end of the resistor L112. One end of a circuit formed by parallel connection of the electrolytic capacitor EC2 and the capacitor C50 is connected with a node between the inductor L2 and the resistor R112, the other end of the circuit formed by parallel connection of the electrolytic capacitor EC2 and the capacitor C50 is grounded, and the anode of the electrolytic capacitor EC2 is connected with the resistor R112.
The second conversion circuit comprises a resistor R114, a resistor R115, an amplifier chip IC5, a resistor R117, a resistor C43, an inductor L1, a resistor R112, a resistor R113 and a diode D7, wherein the front-end voltage VDCC is sequentially connected with the resistor R114, the resistor R115 and the 4 th pin of the amplifier chip IC5, the node between the resistor R114 and the 5 th pin of the amplifier chip IC5 is connected with one end of a capacitor C62, and the other end of the capacitor C62 is grounded; the node between the 6 th pin of the amplifier chip IC5 and the negative electrode of the diode D10 is connected with the node between the capacitor C43 and the inductor L1, the 1 st pin of the amplifier chip IC4 is sequentially connected with the resistor R117, the capacitor C43 and the inductor L1, the resistors R118 and R119 are connected in series between the inductor L1 and the positive electrode of the diode D10, the 2 nd pin GND of the amplifier chip IC5 is grounded, the node between the resistor R118 and the resistor R119 is connected with the 3 rd pin of the amplifier chip IC5, the resistor R119, the capacitor C46 and the diode D10 are grounded, and the node between the inductor L1 and the resistor R112 outputs a second working voltage ZB12V. One end of a resistor R116 and one end of an inductor C61 are externally connected between the resistor R115 and the amplifier chip IC5, and the other end of the resistor R116 and the other end of the inductor C61 are grounded. One end of a circuit formed by connecting the electrolytic capacitor EC8 and the capacitor C46 in parallel is connected with the resistor R118, the other end of the circuit is connected with the resistor R119, the positive electrode of the electrolytic capacitor EC8 is connected with the resistor R118, and the nodes of the negative electrode of the capacitor EC8, the capacitor C46 and the resistor R119 are grounded.
The third conversion circuit comprises a voltage stabilizing chip IC3, the front end voltage VDCC is connected with the input end 3 pin of the voltage stabilizing chip IC3, the grounding end 2 pin of the voltage stabilizing chip IC3 is grounded, and the output end 1 pin of the voltage stabilizing chip IC3 outputs a third working voltage VDD. The voltage stabilizing chip IC3 is 78L05SOT-89 long electric model.
In the conversion circuit using the amplifier chip IC4, the IC4 uses a LV2842 XLVLDDCR SOT6 chip. Resistor R110 is 100K 1%0603, resistor R111 is 0R 5%0603, resistor R112 is 54.9K 1%0603, resistor R113 is 10K 1%0603, capacitor C52, capacitor C50 and capacitor C8 are 100NF 10%0603, capacitor EC2 is 330UF/16V/WL 8 x 11.5, inductor L2 is WQPIG4018-220M, and diode D7 is SS14DO-214AC.
In the conversion circuit adopting the amplifier chip IC5, the IC5 adopts LV2842 XLVLDDCR SOT6 chip, the resistor R114 adopts 60.4K 1%0603, the resistor R115 and the resistor R117 adopt 0R 5%0603, the resistor R116 adopts 7.87K 1%0603, the resistor R118 adopts 200K 1%0603, the resistor R119 adopts 14.3K 1%0603, the capacitor C61, the capacitor C62, the capacitor C43 and the capacitor C46 adopt 100NF 10%0603, the capacitor C100 adopts 100PF 5%0603, the capacitor EC8 adopts 100UF/25V/WL 6.3 x 11, and the diode D10 adopts SS14DO-214AC. The inductance L1 is WQPIG4018-220M.
The transformer adopts HY-B35-1301 model, the primary coil input of the transformer is 220VAC standard, and the 6 th pin and the 7 th pin of the secondary coil output are 8V/220MA. The varistor RR1 is a varistor S20K 420. The electrolytic capacitor EC1 is 1000UF/35V/WL 12.5.25, and the rectifier bridge BD1 is MB10S MBS. The thermistor RT1 is selected from three pins MZ1106E15 1-215 RM/10D3 91.
The above description is not intended to limit the scope of the invention, but is intended to cover modifications and improvements made by those skilled in the art in light of the present teachings.
Claims (10)
1. The power supply circuit with the DC/DC conversion module is characterized by comprising a transformer, a rectification circuit and the DC/DC conversion module, wherein the transformer, the rectification circuit and the DC/DC conversion module are sequentially connected, the DC/DC conversion module comprises a first conversion circuit, a second conversion circuit and a third conversion circuit, the first conversion circuit comprises an amplifier chip IC4, a resistor R110, a resistor R111, a capacitor C8 and an inductor L2, the front end voltage VDCC of the circuit is sequentially connected with the resistor R110 and the 4 th pin of the amplifier chip IC4, the input end of the resistor R110 is connected with one end of a capacitor C52 at the 5 th pin of the amplifier chip IC4, the other end of the capacitor C52 is grounded, the node between the 6 th pin of the amplifier chip IC4, the negative electrode of a diode D7 and the capacitor C8, the input end of the inductor L2 are sequentially connected with the resistor R111, the capacitor C8, the input end of the inductor L2 is connected with the second pin of the amplifier chip IC4, the output end of the diode D7 is connected with the positive electrode of the resistor R113, the positive electrode of the diode D113 is connected with the output end of the resistor R2, and the positive electrode of the diode D113 is connected with the positive electrode of the resistor R112; the power supply DC/DC conversion module converts the front-end voltage VDCC into corresponding specific direct-current voltage to supply power for the following circuit module; the first working voltage VDD converted by the first conversion circuit is used for supplying power to a load switch circuit of the electric energy meter.
2. The power supply circuit with the DC/DC conversion module according to claim 1, wherein the first conversion circuit further comprises an electrolytic capacitor EC2 and a capacitor C50, one end of the circuit formed by parallel connection of the electrolytic capacitor EC2 and the capacitor C50 is connected with a node between the inductor L2 and the resistor R112, the other end of the circuit formed by parallel connection of the electrolytic capacitor EC2 and the capacitor C50 is connected with the ground, and the positive electrode of the electrolytic capacitor EC2 is connected with the resistor R112.
3. The power supply circuit with the DC/DC conversion module according to claim 1, wherein the second conversion circuit comprises a resistor R114, a resistor R115, an amplifier chip IC5, a resistor R117, a resistor C43, an inductor L1, a resistor R112, a resistor R113 and a diode D7, the front-end voltage VDCC is sequentially connected with the resistor R114, the resistor R115 and the 4 th pin of the amplifier chip IC5, a node between the resistor R114 and the 5 th pin of the amplifier chip IC5 is connected with one end of a capacitor C62, and the other end of the capacitor C62 is grounded; the node between the 6 th pin of the amplifier chip IC5 and the negative electrode of the diode D10 is connected with the node between the capacitor C43 and the inductor L1, the 1 st pin of the amplifier chip IC4 is sequentially connected with the resistor R117, the capacitor C43 and the inductor L1, the resistors R118 and R119 are connected in series between the inductor L1 and the positive electrode of the diode D10, the 2 nd pin GND of the amplifier chip IC5 is grounded, the node between the resistor R118 and the resistor R119 is connected with the 3 rd pin of the amplifier chip IC5, the resistor R119, the capacitor C46 and the diode D10 are grounded, and the node between the inductor L1 and the resistor R112 outputs a second working voltage ZB12V.
4. A power circuit with a DC/DC conversion module according to claim 3, wherein a resistor R116 is externally connected between the resistor R115 and the amplifier chip IC5, and an inductor C61 is connected to one end of the resistor R116, and the other end of the resistor R116 and the other end of the inductor C61 are grounded.
5. A power supply circuit with a DC/DC conversion module according to claim 3, wherein the second conversion circuit includes an electrolytic capacitor EC8 and a capacitor C46, one end of the circuit formed by connecting the electrolytic capacitor EC8 and the capacitor C46 in parallel is connected to a resistor R118, the other end is connected to a resistor R119, the positive electrode of the electrolytic capacitor EC8 is connected to the resistor R118, and the node of the negative electrode of the electrolytic capacitor EC8, the capacitor C46 and the resistor R119 is grounded.
6. A power supply circuit with a DC/DC conversion module according to claim 3, characterized in that the amplifier chip IC4 or the amplifier chip IC5 is of the LV2842XLVDDCR SOT6 type.
7. The power supply circuit with the DC/DC conversion module according to claim 1, wherein the third conversion circuit includes a voltage stabilizing chip IC3, the front end voltage VDCC is connected to the input terminal 3 pin of the voltage stabilizing chip IC3, the ground terminal 2 pin of the voltage stabilizing chip IC3 is grounded, and the output terminal 1 pin of the voltage stabilizing chip IC3 outputs the third operating voltage VDD.
8. The power supply circuit with the DC/DC conversion module according to claim 7, wherein the voltage stabilizing chip IC3 is of a type of 78L05SOT-89 long electricity.
9. The power supply circuit with the DC/DC conversion module according to claim 1, wherein the rectifying circuit comprises a rectifying bridge BD1 and an electrolytic capacitor EC1, pins 6 and 7 of the third coil are respectively connected with pins 3 and 4 of an input end of the rectifying bridge BD1, an anode of an output end of the rectifying bridge BD1 is connected with an anode of the electrolytic capacitor EC1, a cathode of an output end of the rectifying bridge BD1 is connected with a cathode of the electrolytic capacitor EC1, a node between the anode of the output end of the rectifying bridge BD1 and the anode of the electrolytic capacitor EC1 outputs a front end voltage VDCC, and a node between the cathode of the output end of the rectifying bridge BD1 and the cathode of the electrolytic capacitor EC1 is grounded.
10. The power supply circuit with the DC/DC conversion module according to claim 1, further comprising a power supply protection circuit, wherein the power supply protection circuit comprises a piezoresistor RR1, a thermistor RT1, a piezoresistor RR1 connected in series between a live wire L line and a zero wire N line, two ends of the piezoresistor RR1 are respectively connected with a 5 pin and a 1 pin of a primary coil of a transformer, a thermistor RT1 is connected between the piezoresistor RR1 and the 1 pin of the primary coil, and a piezoresistor Ra connected in parallel with the piezoresistor RR1 is also arranged between the 5 pin and the 1 pin of the primary coil of the transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611145187.XA CN106787833B (en) | 2016-12-13 | 2016-12-13 | Power supply circuit with DC/DC conversion module |
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| CN201611145187.XA CN106787833B (en) | 2016-12-13 | 2016-12-13 | Power supply circuit with DC/DC conversion module |
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| CN106787833B true CN106787833B (en) | 2023-08-29 |
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| US10014771B2 (en) * | 2013-12-06 | 2018-07-03 | Astec International Limited | Switching shunt regulator circuits |
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| CN101562403A (en) * | 2008-04-17 | 2009-10-21 | 深圳市思达仪表有限公司 | Single-phase electronic type electric energy meter electric source |
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| CN106787833A (en) | 2017-05-31 |
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Address after: No. 1818, Xingping 1st Road, Pinghu Economic Development Zone, Pinghu City, Jiaxing City, Zhejiang Province Applicant after: Zhejiang Hengye Electronics Co.,Ltd. Address before: No. 1818, Xingping 1st Road, Pinghu Economic Development Zone, Pinghu City, Jiaxing City, Zhejiang Province Applicant before: ZHEJIANG HENGYE ELECTRONIC Co.,Ltd. |
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