CN104242688A - Power circuit of electric energy measuring chip - Google Patents
Power circuit of electric energy measuring chip Download PDFInfo
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- CN104242688A CN104242688A CN201410513545.2A CN201410513545A CN104242688A CN 104242688 A CN104242688 A CN 104242688A CN 201410513545 A CN201410513545 A CN 201410513545A CN 104242688 A CN104242688 A CN 104242688A
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Abstract
The invention discloses a power circuit of an electric energy measuring chip. The power circuit comprises three-phase alternating-current input terminals (VAAC, VBAC and VCAC), thermistors (RT), piezoresistors (VR), transformers (T), rectifier modules (D), inductors (L1, L2 and L3), a voltage stabilizer (IC) and capacitors (C1, C2, C3, C4, C5, C6 and C7). The power circuit of the special electric energy measuring chip realizes needed voltage by voltage reduction, rectification, filtration and voltage stabilization on the mains supply. In order to avoid single-phase power shortage, the power supply is connected with three phases of phase voltage parallelly, and reliability of a system is improved. Therefore, through the power circuit, normal operation of the special electric energy measuring chip is guaranteed.
Description
Technical field
The present invention relates to electric vehicle alternating-current charging technical field, in particular to a kind of power circuit of electric energy computation chip.
Background technology
At present, the design commonly used automobile alternating-current charging pile is both at home and abroad developed based on the electric energy computation chip of specialty, namely by carrying out embedded development to specific electric energy computation chip, realizes the correlation functions such as electric energy metrical charging, Charge Management.
Special electric energy computation chip accurately can measure electric energy, is widely used for the exploitation of various ammeter.The peripheral interface circuit developed round special electric energy computation chip is made up of the component module of difference in functionality, and the supply voltage that modules uses is different, therefore will be the satisfactory power circuit of each Modular circuit design.Wherein, the system voltage of special electric energy computation chip requires very high, and small voltage fluctuation and burr all can affect the normal work of chip.
Summary of the invention
Technical problem solved by the invention: for special electric energy computation chip provides what kind of power circuit, the normal work of special electric energy computation chip can be ensured.
The invention provides following technical scheme: a kind of power circuit of electric energy computation chip, comprise three-phase alternating current electrical input, thermistor, piezo-resistance, transformer, rectification module, inductance, pressurizer, electric capacity, described inductance comprises inductance one, inductance two, inductance three, and described electric capacity comprises electric capacity one, electric capacity two, electric capacity three, electric capacity four, electric capacity five, electric capacity six, electric capacity seven.Described thermistor is connected with three-phase alternating current electrical input, described electric capacity one and piezo-resistance are connected to the two ends of thermistor, described thermistor, electric capacity one, piezo-resistance forms primary Ioops, described transformer is in parallel with piezo-resistance, described rectification module is connected with transformer, described inductance one is connected with rectification module, described electric capacity two, electric capacity three, electric capacity four is in parallel with inductance one, described pressurizer is connected with inductance one, described inductance two and inductance three parallel connection, described inductance two and inductance three are contacted with pressurizer, described electric capacity five, electric capacity six, electric capacity seven is in parallel with inductance two and inductance three.
By technique scheme, special electric energy computation chip power circuit of the present invention is by carrying out the voltage needed for step-down, rectification, filtering, voltage stabilizing operation realization to civil power.In order to avoid the phenomenon of single-phase short of electricity, this power supply has also connect three-phase phase voltage, improves the reliability of system.Therefore, by such scheme of the present invention, ensure the normal work of special electric energy computation chip.
Further illustrate as of the present invention, described thermistor has Special Nonlinear temperature characterisitic, for current-limiting protection, it is overheated to prevent, its operation principle is: electric current raises by causing temperature after element, namely the temperature of the heater of resistance own rises, after exceeding the uniform temperature upper limit, resistance increases sharply, thus Limited Current increases, so the decline of electric current causes component temperature to reduce, the reduction of resistance value makes again circuital current increase, component temperature raises, go round and begin again, therefore there is the function making temperature remain on particular range, play again autoregulation to a certain extent.
Further illustrate as of the present invention, described piezo-resistance is mainly used in making overvoltage protection and absorbing surge current.
Further illustrate as of the present invention, described transformer is used for 220V electric main to be depressurized to OK range voltage.
Further illustrate as of the present invention, described rectification module is used for ac voltage rectifier to become direct voltage.
Further illustrate as of the present invention, the LC filter circuit be made up of inductance and electric capacity is for carrying out voltage stabilizing to the voltage exported from rectification module.The principle of the circuit of LC filtering is, when the electric current flowing through inductance coil changes, will produce self induction electromotive force to hinder the change of electric current, thus make the pulsation of load and load voltage greatly reduce in coil.LC filtering is more effective than single inductance or capacitor filtering, but in LC filter circuit, if the value of inductance is too little, all will presents the characteristic of capacitor filtering, otherwise present the characteristic of capacitor filtering.LC filtering can also play the impulse current suppressing rectifying tube, stronger to the adaptability of load.LC filter circuit is applicable to the place requiring that output voltage pulsation is very little, more suitable for high frequency place.
Further illustrate as of the present invention, described pressurizer is three linear voltage stabilizing circuits of a positive voltage output LOW voltage, and it has a series of fixed voltage or adjustable voltage to export, and range of application widely.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further:
Fig. 1 is the power circuit diagram of a kind of electric energy computation chip of the present invention.
Symbol description in figure:
VAAC-three-phase alternating current electrical input; VBAC-three-phase alternating current electrical input; VCAC-three-phase alternating current electrical input;
RT-thermistor;
VR-piezo-resistance;
T-transformer;
D-rectification module;
L1-inductance; L2-inductance; L3-inductance;
IC-pressurizer;
C1-electric capacity; C2-electric capacity; C3-electric capacity; C4-electric capacity; C5-electric capacity; C6-electric capacity; C7-electric capacity.
Embodiment
As shown in Figure 1, a kind of power circuit of electric energy computation chip, comprises three-phase alternating current electrical input VAAC, VBAC, VCAC, thermistor RT, piezo-resistance VR, transformer T, rectifier module D, inductance L 1, inductance L 2, inductance L 3, pressurizer IC, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7.
Described thermistor RT and three-phase alternating current electrical input VAAC, VBAC, VCAC connects, described electric capacity C1 and piezo-resistance VR is connected to the two ends of thermistor RT, described thermistor RT, electric capacity C1, piezo-resistance VR forms primary Ioops, described transformer T is in parallel with piezo-resistance VR, described rectifier module D is connected with transformer T, described inductance L 1 is connected with rectifier module D, described electric capacity C2, electric capacity C3, electric capacity C4 is in parallel with inductance L 1, described pressurizer IC connects with inductance L 1, described inductance L 2 and inductance L 3 parallel connection, described inductance L 2 and inductance L 3 are contacted with pressurizer IC, described electric capacity C5, electric capacity C6, electric capacity C7 is in parallel with inductance L 2 and inductance L 3.
Wherein, the preferred AMS1117 of the preferred HD06 of rectifier module D, pressurizer IC.
In Fig. 1, details are as follows for the power circuit diagram of electric energy computation chip: three-phase alternating current is from ground civil power, and the thermistor RT of circuit diagram front end has Special Nonlinear temperature characteristic thermistor, and for current-limiting protection, it is overheated to prevent.Piezo-resistance VR is mainly used in making overvoltage protection and absorbing surge current.220V alternating current is depressurized to after OK range voltage through transformer T, is rectified into direct voltage through HD06 rectification module.HD06 rectification module is a kind of direct current signal that the AC signal of input variable can be converted to one group of output variable through isolation amplification, HD06 has two input pins respectively in order to input ac voltage, two output pin output dc voltages, the input of HD06, output, power supply tripartite isolate entirely, anti-interference, and export, export range of choice wide, accuracy is high, power supply can be selected, and guide rails assembling is convenient to detect and safeguard.The voltage that HD06 exports not is pure direct voltage, and observing its output voltage from oscilloscope is unidirectional pulsating voltage, differs greatly with direct voltage, containing larger ripple component in waveform.So the voltage that HD06 rectification module exports need carry out voltage stabilizing through LC filter circuit.AMS1117 is three linear voltage stabilizing circuits of a positive voltage output LOW voltage, and it has a series of fixed voltage or adjustable voltage to export, and range of application widely.The inner integrated overtemperature protection of AMS1117 and thermal relief protective circuit, guarantee the stability of chip and power-supply system, and its most High Output Current can reach 1A, and output voltage precision can reach 2%.
Above content is only better embodiment of the present invention, and for those of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, this description should not be construed as limitation of the present invention.
Claims (1)
1. a power circuit for electric energy computation chip, comprises three-phase alternating current electrical input (VAAC, VBAC, VCAC), thermistor (RT), piezo-resistance (VR), transformer (T), rectification module (D), inductance (L1, L2, L3), pressurizer (IC), electric capacity (C1, C2, C3, C4, C5, C6, C7), it is characterized in that: described thermistor (RT) and three-phase alternating current electrical input (VAAC, VBAC, VCAC) connect, described electric capacity (C1) and piezo-resistance (VR) are connected to the two ends of thermistor (RT), described thermistor (RT), electric capacity (C1), piezo-resistance (VR) forms primary Ioops, described transformer (T) is in parallel with piezo-resistance (VR), described rectification module (D) is connected with transformer (T), described inductance (L1) is connected with rectification module (D), described electric capacity (C2), electric capacity (C3), electric capacity (C4) is in parallel with inductance (L1), described pressurizer (IC) is connected with inductance (L1), described inductance (L2) and inductance (L3) parallel connection, described inductance (L2) and inductance (L3) are contacted with pressurizer (IC), described electric capacity (C5), electric capacity (C6), electric capacity (C7) and inductance L 2) and inductance (L3) in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410513545.2A CN104242688A (en) | 2014-09-29 | 2014-09-29 | Power circuit of electric energy measuring chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410513545.2A CN104242688A (en) | 2014-09-29 | 2014-09-29 | Power circuit of electric energy measuring chip |
Publications (1)
| Publication Number | Publication Date |
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| CN104242688A true CN104242688A (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410513545.2A Pending CN104242688A (en) | 2014-09-29 | 2014-09-29 | Power circuit of electric energy measuring chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391314A (en) * | 2015-12-30 | 2016-03-09 | 山东海量信息技术研究院 | Direct current voltage stabilizing power source |
| CN108254600A (en) * | 2018-02-23 | 2018-07-06 | 南京飞腾电子科技有限公司 | Electric energy meter |
-
2014
- 2014-09-29 CN CN201410513545.2A patent/CN104242688A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391314A (en) * | 2015-12-30 | 2016-03-09 | 山东海量信息技术研究院 | Direct current voltage stabilizing power source |
| CN108254600A (en) * | 2018-02-23 | 2018-07-06 | 南京飞腾电子科技有限公司 | Electric energy meter |
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Application publication date: 20141224 |
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| RJ01 | Rejection of invention patent application after publication |