CN204707050U - Novel rectifying filter circuit - Google Patents
Novel rectifying filter circuit Download PDFInfo
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- CN204707050U CN204707050U CN201420826023.3U CN201420826023U CN204707050U CN 204707050 U CN204707050 U CN 204707050U CN 201420826023 U CN201420826023 U CN 201420826023U CN 204707050 U CN204707050 U CN 204707050U
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Abstract
The utility model provides a kind of novel rectifying filter circuit, described novel rectifying filter circuit at least inputs a road alternating voltage and at least exports a road direct voltage, the novel rectifying filter circuit that single channel exports comprises rectification circuit, decompression voltage regulator and filter circuit, wherein, described rectification circuit is connected with alternating voltage input; Described decompression voltage regulator is connected with filter circuit with described rectification circuit, for by described Output Voltage in Rectified Circuits step-down and again through filter circuit output dc voltage after voltage stabilizing to certain voltage value.Adopt the technical solution of the utility model, after lowering and stabilizing blood pressure process is directly carried out in rectification output, carry out filtering again, significantly can promote ripple characteristics, lengthen the output duration of transformer, improve the output characteristic of power supply.
Description
Technical field
The utility model belongs to switch power technology field, is specifically related to a kind of novel rectifying filter circuit.
Background technology
Current rectifying and wave filtering circuit is generally used for AC energy to be converted to direct current energy, and most of current rectifying and wave filtering circuit is made up of transformer, rectification circuit and filter etc.See Fig. 1, be depicted as the theory diagram of normal conventional rectification filter circuit in prior art, be low-voltage AC by civil power through transformer pressure-reducing, then through full-bridge rectification, become DC ripple voltage, then rely on electric capacity to carry out filtering and obtain the flat wave voltage of direct current.
This conventional rectification filter circuit directly connects filter capacitor after rectification circuit, because filter capacitor has the characteristic of peak value maintenance, the general crest voltage close to exchanging input of voltage stabilizing value on it, therefore when AC-input voltage is greater than this voltage stabilizing value, could can only charge to filter capacitor; After rear class loading, current rectifying and wave filtering circuit shows as near the peak value close to AC input voltage waveform and have the high density high-energy electric current concentrated very much to pass through, the Full-time zone electric current of rear class all can only be supplemented within this short time.In other words, the Full-time zone electric current of rear class is squeezed fully to be supplemented within this short time, and rear class electric capacity only plays the effect (can not provide active current) that accumulation of energy is discharged level and smooth, shows as the crowded height of the crowded height of current amplitude and the frequency of load current waveform.In addition, outside this short time current district, power supply can only rely on the energy storage of electric capacity to provide, and shows as the decline of voltage, thus causes ripple.Simultaneously because the most of the time relies on the energy storage for power supply of electric capacity, the characteristic of power supply is mainly rendered as capacitor type characteristic, especially the non-constant of transient high-current pulse characteristic.
In various application of power, no matter which kind of lowering and stabilizing blood pressure measure its subsequent conditioning circuit have employed, and from the path angle of electric current, the characteristic of whole circuit all will be subject to the bottleneck restriction of this current rectifying and wave filtering circuit characteristic.
Therefore, for the above-mentioned defect existed in currently available technology, be necessary to study in fact, to provide a kind of scheme, solve the defect existed in prior art.
Utility model content
In order to overcome the defect of above-mentioned prior art, the utility model provides a kind of novel rectifying filter circuit, by input ac voltage by first through decompression voltage regulator process after rectifier circuit rectifies, then through filter circuit output dc voltage, to solve the problem.
For solving prior art Problems existing, the technical solution of the utility model is:
A kind of novel rectifying filter circuit, described novel rectifying filter circuit at least inputs a road alternating voltage and at least exports a road direct voltage, and the novel rectifying filter circuit that single channel exports comprises rectification circuit, decompression voltage regulator and filter circuit, wherein,
Described rectification circuit is connected with alternating voltage input;
Described decompression voltage regulator is connected with filter circuit with described rectification circuit, for by described Output Voltage in Rectified Circuits step-down and again through filter circuit output dc voltage after voltage stabilizing to certain voltage value.
Preferably, when the alternating voltage inputted is three-phase alternating voltage, the novel rectifying filter circuit that single channel exports comprises rectification circuit, decompression voltage regulator and filter circuit, wherein, described rectification circuit is rectified three-phase circuit, every commutating phase exports and all connects decompression voltage regulator described in, and the output of the decompression voltage regulator in every phase loop is also connected with described filter circuit after connecing.
Preferably, during described novel rectifying filter circuit output multi-channel direct voltage, the novel rectifying filter circuit exported by multiple described single channel connecing forms.
Preferably, described decompression voltage regulator adopts linear stabilized power supply chip to realize.
Preferably, described decompression voltage regulator also comprises with described linear stabilized power supply chip and the expansion current circuit connect, and described expansion current circuit is for increasing the output current of described linear stabilized power supply chip.
Preferably, described linear stabilized power supply chip is LM317 or LM337.
Preferably, power supply chip LM317, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, first rheostat RW1, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, second diode D2, 3rd diode D3, 4th diode D4, first triode Q1 and the second triode Q2, wherein, the one end exchanging input is connected with the anode of described second diode D2, the negative terminal of described second diode D2 is connected with the collector electrode of the second triode with the anode of the 4th diode D4, the negative terminal of described 4th diode D4 is connected with the emitter of the first triode Q1 with one end of the 4th resistance R4, the other end of described 4th resistance R4 is connected with the 3rd pin of described power supply chip LM317 jointly with one end of the 5th resistance R5, the other end of described 5th resistance R5 is connected with the base stage of described first triode Q1, the collector electrode of described first triode Q1 is connected with one end of the 6th resistance R6, the other end of described 6th resistance R6 is connected with one end of the 7th resistance R7 with the base stage of described second triode Q2, the other end of described 7th resistance R7 and the emitter of described second triode Q2, the anode of the 3rd electric capacity C3, the negative terminal of the 3rd triode D3, one end of second resistance R2 is connected as DC output end positive pole with second pin of power supply chip LM317, the anode of the other end of described second resistance R2 and first pin of power supply chip LM317, the 3rd diode D3, one end of the first resistance R1, the anode of the first electric capacity C1 are connected with one end of the second electric capacity C2, the other end of described first resistance R1 is connected with the variable resistance end of described first rheostat RW1, and the other end of the other end of described first rheostat RW1, the negative terminal of a low electric capacity C1, the second electric capacity C2, the negative terminal of the 3rd electric capacity C3, the other end of the 3rd resistance R3 and the other end exchanging input are jointly connected to the ground and connect.
Compared with prior art, adopt such scheme of the present utility model, after lowering and stabilizing blood pressure process is directly carried out in rectification output, carry out filtering again, significantly can promote ripple characteristics, lengthen the output duration of transformer, improve the output characteristic of power supply.
Accompanying drawing explanation
Fig. 1 is the theory diagram of conventional rectification filter circuit in prior art;
Fig. 2 is the theory diagram of the utility model novel rectifying filter circuit;
Fig. 3 is the fundamental diagram of the utility model novel rectifying filter circuit;
Fig. 4 is the circuit theory diagrams of the utility model novel rectifying filter circuit execution mode one;
Fig. 5 is the circuit theory diagrams of the utility model novel rectifying filter circuit execution mode two;
Fig. 6 is the theory diagram of the utility model novel rectifying filter circuit execution mode three;
Fig. 7 is the circuit theory diagrams of the utility model novel rectifying filter circuit execution mode four;
Fig. 8 is the theory diagram of the utility model novel rectifying filter circuit execution mode five;
Fig. 9 is the fundamental diagram of the utility model novel rectifying filter circuit execution mode five;
Figure 10 is the circuit theory diagrams of the utility model novel rectifying filter circuit execution mode six;
Figure 11 is prior art conventional rectification filter circuit output dc voltage oscillogram;
Figure 12 is the utility model novel rectifying filter circuit output dc voltage oscillogram.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
On the contrary, the utility model is contained any by the substituting of making on marrow of the present utility model and scope of defining of claim, amendment, equivalent method and scheme.Further, in order to make the public have a better understanding to the utility model, in hereafter details of the present utility model being described, detailedly describe some specific detail sections.Do not have the description of these detail sections can understand the utility model completely for a person skilled in the art yet.
In order to solve the problem existing for prior art current rectifying and wave filtering circuit, the utility model proposes a kind of novel rectifying filter circuit, at least input a road alternating voltage and at least export a road direct voltage, it is first through decompression voltage regulator process after institute's input ac voltage is passed through rectifier circuit rectifies, then through filter circuit output dc voltage.
See Fig. 2, be depicted as the theory diagram of the utility model novel rectifying filter circuit, for the novel rectifying filter circuit that single channel exports, comprise rectification circuit, decompression voltage regulator and filter circuit, rectification circuit is connected with alternating voltage input, and general institute input ac voltage is that civil power exports through transformer; Rectification circuit is half-wave rectifying circuit, full bridge rectifier or rectified three-phase circuit etc.; Filter circuit is generally made up of electric capacity original paper.
Described decompression voltage regulator is connected with filter circuit with described rectification circuit, for by described Output Voltage in Rectified Circuits step-down and again through filter circuit output dc voltage after voltage stabilizing to certain voltage value.
See Fig. 3, be depicted as the fundamental diagram of the utility model novel rectifying filter circuit, wherein, transformer alternating input crest voltage is 67.8V, and the voltage stabilizing value of decompression voltage regulator is 45.6V.Specific works process is as follows:
When just having started to power on, filter capacitor all do not have electricity, when bearing just down on transformer output is, transformer output voltage progressively increases from 0V, until lowering and stabilizing blood pressure value 45.6V, output voltage follower input voltage progressively rises, electric capacity is synchronously charged, as curved section 1-2 in figure;
After transformer output voltage progressively increases from 45.6V again, lowering and stabilizing blood pressure link works, output is stabilized in 45.6V, load current now mainly flows through from transformer, lowering and stabilizing blood pressure link bears the power consumption of voltage difference part, input voltage is as curved section 2-3 in Fig. 3, and output voltage is as figure cathetus section 2-3;
After transformer output voltage progressively reduces from 45.6V again, lowering and stabilizing blood pressure link is without pressure reduction, export filtered electric capacity and be stabilized in 45.6V, load current now mainly flows through from filter capacitor, output voltage progressively reduces along with capacitor discharge, input voltage is as curved section 3-4 in figure, and output voltage is as Fig. 3 cathetus section 3-5 (not showing voltage drop details in Fig. 3);
After this transformer oppositely exports, and through rectification circuit input positive supply, is also namely rectified into positive supply, as curved section 4-8 in figure;
When transformer output voltage progressively increases from from 0V, until lowering and stabilizing blood pressure value 45.6V, output voltage continues progressively to reduce along with filter capacitor electric discharge, and input voltage is as curved section 4-6 in Fig. 3, and output voltage is as Fig. 3 cathetus section 5-6 (not showing voltage drop details in Fig. 3);
After transformer output voltage progressively increases from 45.6V again, decompression voltage regulator works, output is stabilized in 45.6V, load current now mainly flows through from transformer, decompression voltage regulator bears the power consumption of voltage difference part, input voltage is as curved section 6-7 in Fig. 3, and output voltage is as figure cathetus section 6-7; After this loop cycle change from point 3.
From above-mentioned principle Analysis, transformer is participated in load current directly in curved section 2-3,6-7 section and is provided, its maximum functional duration by voltage stabilizing value and transformer sine wave output intersection point 2,3 between time difference determine, also namely direct relation is had with voltage stabilizing value, voltage stabilizing value is lower, and transformer maximum functional duration is longer.
Adopt this rectifying and voltage-stabilizing filter circuit, waveform after rectification keeps without the peak value of filter capacitor, and directly carry out step-down process by decompression voltage regulator and voltage stabilizing to certain voltage value, widened the output duration of transformer, thus the defect of the above-mentioned common current rectifying and wave filtering circuit mentioned can have been overcome.
Participate in Fig. 4, be depicted as the circuit theory diagrams of the utility model novel rectifying filter circuit execution mode one, wherein, decompression voltage regulator is realized by linear stabilized power supply chip LM317 and peripheral circuit thereof.Concrete, novel rectifying filter circuit comprises power supply chip LM317, the first resistance R1, the second resistance R2, the 3rd resistance R3, the first rheostat RW1, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the first diode D1, the second diode D2 and the 3rd diode D3, wherein, the one end exchanging input is connected with the anode of described second diode D2, and the negative terminal of described second diode D2 is connected with the 3rd pin of power supply chip LM317 with the negative terminal of the first diode D1, second pin of power supply chip LM317 and the negative terminal of the first diode D1, the anode of the 3rd electric capacity C3, the negative terminal of the 3rd triode D3 is connected as DC output end positive pole with one end of the second resistance R2, the other end of the second resistance R2 and first pin of power supply chip LM317, the anode of the 3rd diode D3, one end of first resistance R1, the anode of the first electric capacity C1 is connected with one end of the second electric capacity C2, the other end of the first resistance R1 is connected with the variable resistance end of described first rheostat RW1, the other end of described first rheostat RW1, the negative terminal of a low electric capacity C1, the other end of the second electric capacity C2, the negative terminal of the 3rd electric capacity C3, the other end of the 3rd resistance R3 and the other end of interchange input are jointly connected to the ground and connect.Regulate the variable resistance end adjustable output VD value of the first rheostat RW1.This circuit working principle is as follows:
Prime transformer output AC voltage holds formation 1 loop through the second diode D1, power supply chip LM317 and load regulation three resistance R3 with getting back to, and output obtains stable direct-flow positive voltage.
LM317 Output Voltage Formula is Vout=Vref* (1+ (R1+RW1)/R2)+Iadj* (R1+RW1);
Wherein: Vout is output voltage, Vref is the intrinsic parameter of LM317; The 3rd pin IN termination input AC electricity of LM317, its second pin OUT holds the constant voltage difference of holding relative to the first pin ADJ, and representative value is 1.25V; Iadj is very little current value, is usually less than 100uA, negligible; Suitable adjustment RW1, makes output voltage stabilization at about 45.6V; LM317 can only allow voltage stabilizing 1.2V-37V usually, but LM317 allows constrained input pressure reduction in 40V, so also can normally use here; In circuit, the second resistance R2, the first resistance R1, the first rheostat RW1, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 3rd diode D3 are the peripheral components of LM317, realize the lowering and stabilizing blood pressure effect of LM317.
Participate in Fig. 5, be depicted as the circuit theory diagrams of the utility model novel rectifying filter circuit execution mode two, the basis of Fig. 4 adds expansion current circuit, expand current circuit and be made up of R4, R5, R6, R7, Q1, Q2, for realizing the expansion stream of LM317, namely add the output current of LM317.
In addition, the C3 in Fig. 5 circuit is filter capacitor, the filter action after a main lowering and stabilizing blood pressure; Diode D4 mainly plays a part to protect LM317, plays cut-off effect, prevent counter voltage from acting on LM317, thus shield to LM317 when input voltage is less than lowering and stabilizing blood pressure value; Resistance R3 as dummy load, operating state when stablizing non-loaded.
See Fig. 6, be depicted as the theory diagram of the utility model novel rectifying filter circuit execution mode three, novel rectifying filter circuit single channel shown in two-way Fig. 2 exported also connect and realizes two-way direct voltage output, and physical circuit operation principle see as above describing, can repeat no more here.Accordingly, when output multi-channel direct voltage, the novel rectifying filter circuit that novel rectifying filter circuit is exported by multiple described single channel connecing forms.
See Fig. 7, be depicted as the circuit theory diagrams of the utility model novel rectifying filter circuit execution mode four, it is by the circuit shown in two-way Fig. 4 and connect and form, and physical circuit operation principle see as above describing, can repeat no more here.Wherein transformer centre tap ground connection, thus negative and positive dual power output can be realized, negative supply output circuit, adopt linear stabilized power supply chip LM337 to realize.
Certainly, the novel rectifying filter circuit shown in Fig. 6 also can be connect formed by the circuit shown in two-way Fig. 5, and physical circuit operation principle see as above describing, can repeat no more here.
In above-mentioned novel rectifying filter circuit, difference between the peak values of ac voltage that transformer operating time is exported by transformer and the voltage stabilizing value of decompression voltage regulator determines, as can be seen from Figure 3, transformer does not export in curved section 3-4,4-6, capacitor discharge is relied on to obtain the electric current of power supply, overall output voltage presents decline phenomenon, thus circuit ripple is increased.In order to solve the problems of the technologies described above, the utility model proposes a kind of three phase rectifier filter circuit circuit.Participate in Fig. 8, described is the theory diagram of the utility model novel rectifying filter circuit execution mode five, comprise rectification circuit, decompression voltage regulator and filter circuit, wherein, described rectification circuit is rectified three-phase circuit, every commutating phase exports and all connects decompression voltage regulator described in, and the output of the decompression voltage regulator in every phase loop is also connected with described filter circuit after connecing.
See Fig. 9, be depicted as the fundamental diagram of the utility model novel rectifying filter circuit execution mode five, adopt three-phase output transformer, be connected into Y connection, the voltage stabilizing value that decompression voltage regulator exports is selected under the minimum point voltage of three-phase 6 pulse wave, then ensureing that the DC power supply any moment exported all directly provides electric current through being rectified to decompression voltage regulator by Transformer Winding output, can ensure that Full-time zone exports.Mode according to Fig. 3 is analyzed, and in Fig. 8, transformer maximum functional duration is curved section 2-4,7-9,12-14, and it exports duration overlay region curved section 7-3-4,12-8-9.So just completely avoid the shortcoming of capacitive power supply mentioned above.
See Figure 10, be depicted as the circuit theory diagrams of the utility model novel rectifying filter circuit execution mode six, its operation principle see above-mentioned analysis, can not repeat them here.
Certainly, the novel rectifying filter circuit of the utility model three-phase input also can increase and expand current circuit on the basis of Fig. 8, and its operation principle see above-mentioned analysis, can not repeat them here.
In order to verify the technique effect that bring of technique scheme in practical power application, below the output dc voltage waveform of conventional rectification filter circuit in prior art and novel rectifying filter circuit of the present utility model is analyzed.
See Figure 11, be depicted as prior art conventional rectification filter circuit output dc voltage oscillogram, wherein, VD is 45.6V, and filter capacitor is 1000 μ F, when the sinusoidal wave peak value 2A of load 1kHz, and the DC voltage waveform recorded.
See Figure 12, be depicted as the utility model novel rectifying filter circuit output dc voltage oscillogram, wherein, VD is 45.6V, and filter capacitor is 1000 μ F, when the sinusoidal wave peak value 2A of load 1kHz, and the DC voltage waveform recorded.
The output dc voltage waveform of Figure 11 with Figure 12 records under identical test parameter, carries out data analysis to two figure:
(1) conventional rectification filter circuit Vpp ≈ 400mV; The utility model novel rectifying filter circuit Vpp ≈ 100mV, is only 25% of custom circuit;
(2) conventional rectification filter circuit, the transformer operating time is about 4.8mS, and duty ratio is 4.8/10=48%; The utility model novel rectifying filter circuit, the time is about 5.6mS, and duty ratio is 5.6/10=56%, be 117% of prior art;
(3) pressure drop of the output dc voltage of conventional rectification filter circuit is about 45.6-38.6=7V; The pressure drop of the utility model novel rectifying filter circuit is about 0V, greatly improves output performance; Also the output internal resistance reflecting new rectifier power source is from the side minimum.
From upper analysis, adopt technique scheme, significantly can promote ripple characteristics, lengthen the output duration of transformer, greatly improve the output characteristic of power supply.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. a novel rectifying filter circuit, it is characterized in that: described novel rectifying filter circuit at least inputs a road alternating voltage and at least exports a road direct voltage, the novel rectifying filter circuit that single channel exports comprises rectification circuit, decompression voltage regulator and filter circuit, wherein
Described rectification circuit is connected with alternating voltage input;
Described decompression voltage regulator is connected with filter circuit with described rectification circuit, for by described Output Voltage in Rectified Circuits step-down and again through filter circuit output dc voltage after voltage stabilizing to certain voltage value; Wherein, described decompression voltage regulator adopts linear stabilized power supply chip to realize, and described decompression voltage regulator also comprises with described linear stabilized power supply chip and the expansion current circuit connect, and described expansion current circuit is for increasing the output current of described linear stabilized power supply chip.
2. novel rectifying filter circuit according to claim 1, it is characterized in that, when the alternating voltage inputted is three-phase alternating voltage, the novel rectifying filter circuit that single channel exports comprises rectification circuit, decompression voltage regulator and filter circuit, wherein, described rectification circuit is rectified three-phase circuit, and every commutating phase exports and all connects decompression voltage regulator described in, and the output of the decompression voltage regulator in every phase loop is also connected with described filter circuit after connecing.
3. novel rectifying filter circuit according to claim 1 and 2, is characterized in that, during described novel rectifying filter circuit output multi-channel direct voltage, the novel rectifying filter circuit exported by multiple described single channel connecing forms.
4. novel rectifying filter circuit according to claim 1, is characterized in that, described linear stabilized power supply chip is LM317 or LM337.
5. novel rectifying filter circuit according to claim 1, is characterized in that, power supply chip LM317, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, first rheostat RW1, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, second diode D2, 3rd diode D3, 4th diode D4, first triode Q1 and the second triode Q2, wherein, the one end exchanging input is connected with the anode of described second diode D2, the negative terminal of described second diode D2 is connected with the collector electrode of the second triode with the anode of the 4th diode D4, the negative terminal of described 4th diode D4 is connected with the emitter of the first triode Q1 with one end of the 4th resistance R4, the other end of described 4th resistance R4 is connected with the 3rd pin of described power supply chip LM317 jointly with one end of the 5th resistance R5, the other end of described 5th resistance R5 is connected with the base stage of described first triode Q1, the collector electrode of described first triode Q1 is connected with one end of the 6th resistance R6, the other end of described 6th resistance R6 is connected with one end of the 7th resistance R7 with the base stage of described second triode Q2, the other end of described 7th resistance R7 and the emitter of described second triode Q2, the anode of the 3rd electric capacity C3, the negative terminal of the 3rd triode D3, one end of second resistance R2 is connected as DC output end positive pole with second pin of power supply chip LM317, the anode of the other end of described second resistance R2 and first pin of power supply chip LM317, the 3rd diode D3, one end of the first resistance R1, the anode of the first electric capacity C1 are connected with one end of the second electric capacity C2, the other end of described first resistance R1 is connected with the variable resistance end of described first rheostat RW1, and the other end of the other end of described first rheostat RW1, the negative terminal of the first electric capacity C1, the second electric capacity C2, the negative terminal of the 3rd electric capacity C3, the other end of the 3rd resistance R3 and the other end exchanging input are jointly connected to the ground and connect.
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| CN201420826023.3U CN204707050U (en) | 2014-12-23 | 2014-12-23 | Novel rectifying filter circuit |
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| CN201420826023.3U CN204707050U (en) | 2014-12-23 | 2014-12-23 | Novel rectifying filter circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682726A (en) * | 2014-12-23 | 2015-06-03 | 天安电气集团浙江电气有限公司 | Novel rectifilter circuit and control method thereof |
| CN106602899A (en) * | 2016-11-28 | 2017-04-26 | 中核核电运行管理有限公司 | High-performance power supply module used for reactor core nuclear detection system of nuclear power station |
-
2014
- 2014-12-23 CN CN201420826023.3U patent/CN204707050U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682726A (en) * | 2014-12-23 | 2015-06-03 | 天安电气集团浙江电气有限公司 | Novel rectifilter circuit and control method thereof |
| CN106602899A (en) * | 2016-11-28 | 2017-04-26 | 中核核电运行管理有限公司 | High-performance power supply module used for reactor core nuclear detection system of nuclear power station |
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Addressee: Guo Xiaohua, general manager of Beijing General Administration of China Patent Office (general partnership) Document name: Notification of Acceptance of Request for Reexamination |
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