CN106452139A - Circuit for testing DC component in AC voltage and device for eliminating DC component - Google Patents
Circuit for testing DC component in AC voltage and device for eliminating DC component Download PDFInfo
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- CN106452139A CN106452139A CN201610931614.0A CN201610931614A CN106452139A CN 106452139 A CN106452139 A CN 106452139A CN 201610931614 A CN201610931614 A CN 201610931614A CN 106452139 A CN106452139 A CN 106452139A
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- circuit
- voltage
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4803—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode with means for reducing DC component from AC output voltage
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a circuit for testing a DC component in AC voltage. The circuit comprises a voltage divider circuit which is used for dividing the AC voltage, a filter circuit, and an integration circuit, wherein the input end of the filter circuit is connected with the output end of the voltage divider circuit,and the filter circuit is used for filtering the waves of the output voltage of the voltage divider circuit, the input end of the integration circuit is connected with the output end of the filter circuit, the integration circuit is used for integrating the output voltage of the filter circuit. A device for eliminating the DC component is also provided. The device is designed to adopt the DC component testing circuit eliminate the DC component of the output voltage of an inverter circuit. The circuit can detect the minimal DC voltage component in the AC voltage, and has remarkable sensitivity.
Description
Technical field
The present invention relates to the circuit of DC component in detection alternating voltage and the dress eliminating the DC component in alternating voltage
Put.
Background technology
In present power source products, it is mostly to be unidirectional current by AC rectification, then by power electronic devices such as IGBT,
With the mode inversion of PWM pulsewidth modulation as alternating current, through LC filters filter high fdrequency components, obtain AC sine wave, then use
Booster transformer boosting obtains the sine voltage of specified amplitude.But the conduction voltage drop due to power electronic devices such as IGBT is deposited
In difference, and the drive signal of each IGBT there is also temporal delay, leads to the voltage of this power supply product final output to be believed
There are DC voltage bias in number.DC offset voltage can form loop by transformator, makes transformator flow through DC excitation
Electric current.If this exciting current is bigger than normal, magnetic core can be made to be operated in inelastic region, then transformer secondary output voltage can produce abnormal
Become, make product be unable to reach design standard.
Content of the invention
The technical problem to be solved is to provide a kind of circuit of the DC component in detection alternating voltage, its
Relatively more small DC voltage component in alternating voltage can be detected, there is higher sensitivity.
Further technical problem to be solved by this invention is to provide a kind of direct current of inverter circuit output voltage to divide
Amount cancellation element.
For solving above-mentioned technical problem, the technical solution used in the present invention is：
The circuit of the DC component in detection alternating voltage, including：
Bleeder circuit, for carrying out partial pressure to described alternating voltage；
Filter circuit, the input of filter circuit is connected with the outfan of bleeder circuit, for the output voltage to bleeder circuit
It is filtered；
Integrating circuit, the input of integrating circuit is connected with the outfan of filter circuit, for the output voltage to filter circuit
It is integrated.
Present invention also offers a kind of DC component cancellation element of inverter circuit output voltage, this DC component elimination dress
Put including control circuit and with the output voltage of single-phase inversion circuit or three-phase inverting circuit one-to-one single group or three groups
Direct current biasing testing circuit, every group of direct current biasing testing circuit includes bleeder circuit, filter circuit, integrating circuit and signal condition
Circuit；Control circuit includes A/D change-over circuit and controller；It is mutually electric that the input of bleeder circuit connects corresponding inverter circuit
Pressure outfan, for exporting after the output phase voltage partial pressure by inverter circuit；The input of filter circuit is defeated with bleeder circuit
Go out end to connect, for being filtered to the alternating voltage that bleeder circuit exports；The input of integrating circuit is defeated with filter circuit
Go out end to connect, for being integrated to the output voltage of filter circuit；The input of signal conditioning circuit is defeated with integrating circuit
Go out end to connect, the voltage signal for exporting integrating circuit nurses one's health into the voltage signal that A/D change-over circuit can identify；A/D
The input of change-over circuit is connected with the outfan of signal conditioning circuit, and the signal for exporting signal conditioning circuit carries out mould
Export to controller after number conversion；The signal input part of controller is connected with the outfan of described A/D change-over circuit, for gathering
Polarity and size to judge the DC component in inverter circuit output voltage for the digital signal of A/D change-over circuit output, and root
It is judged that the modulating wave of the switching tube to inverter circuit for the result adds and the DC component polarity phase in inverter circuit output voltage
Anti- bias voltage, to eliminate the DC component in inverter circuit output voltage.
After technique scheme, the present invention at least has advantages below：
1st, the circuit of the DC component in detection alternating voltage according to embodiments of the present invention utilizes filter circuit by output AC
Component is reduced to small degree, is picked up DC quantity using integrating circuit, by this integrating circuit to DC component one
Direct integral, even small direct current biasing also can be detected, and is not caused electronics by external factor such as temperature humidity
The impact of device parameter shift, not by inconsistent inspection accuracy of detection being caused to be affected, substantially increasing system of device parameters
Survey sensitivity and precision；
2nd, pass through to adjust the parameter of integrating circuit, thus it is possible to vary the RC time constant of integration, to change fast jogging speed, reduces as far as possible
Testing circuit response speed, to avoid in unexpected plus-minus, full load regulated quantity is excessive causes the unstable of system；
The DC component cancellation element of inverter circuit output voltage the 3rd, according to embodiments of the present invention, can not only detect inversion
DC component in circuit output voltage, and can be added and inversion by the modulating wave of the switching tube to inverter circuit for the controller
The opposite polarity bias voltage of DC component in circuit output voltage, is corrected to DC component, and this DC component is pressed down
Make the degree ignored, thus ensureing the waveform quality of inverter circuit output voltage and the reliability of switching tube；
4th, the present invention is with low cost, and device structure is simple.
Brief description
Fig. 1 shows the principle frame of the circuit of DC component in detection alternating voltage according to an embodiment of the invention
Figure.
Fig. 2 shows the principle of the DC component cancellation element of inverter circuit output voltage according to an embodiment of the invention
Block diagram.
Fig. 3 to Fig. 6 shows the direct current biasing detection electricity of the DC component cancellation element according to further embodiment of this invention
The circuit theory diagrams on road.
Fig. 7 shows the waveform diagram of the sinusoidal modulation wave of the switching tube of the inverter circuit of standard.
Fig. 8 shows the R phase output voltage waveforms of the inverter circuit of the DC offset voltage containing+20V.
Fig. 9 shows the sinusoidal modulation wave after the DC component cancellation element correction according to further embodiment of this invention
Waveform.
Figure 10 show corrected after inverter circuit R phase output voltage waveforms.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Fig. 1 shows the principle frame of the circuit of DC component in detection alternating voltage according to an embodiment of the invention
Figure.Refer to Fig. 1, the circuit of the DC component in detection alternating voltage according to an embodiment of the invention, including bleeder circuit
90th, filter circuit 91 and integrating circuit 92.
The input of bleeder circuit 90 is connected with alternating voltage, for carrying out partial pressure to alternating voltage；Filter circuit 91
Input is connected with the outfan of bleeder circuit 90, for being filtered to the output voltage of bleeder circuit 90；Integrating circuit 92
Input be connected with the outfan of filter circuit 91, for being integrated to the output voltage of filter circuit 91.
Preferably, bleeder circuit 90 is resistor voltage divider circuit；Integrating circuit 92 is amplifier integrating circuit；Filter circuit is RC
Filter circuit.
Fig. 2 shows the principle of the DC component cancellation element of inverter circuit output voltage according to an embodiment of the invention
Block diagram.Refer to Fig. 2, in the present embodiment, inverter circuit 3 is three-phase inverting circuit, exports R, S, T three-phase voltage.According to this
Invent the DC component cancellation element of the inverter circuit output voltage of an embodiment, including control circuit 1 and respectively with inversion
The one-to-one three groups of direct current biasing testing circuits 2 of three-phase output voltage of circuit 3.In other embodiments, inverter circuit 3
Can be single-phase inversion circuit, an output single-phase alternating voltage, one group of direct current biasing testing circuit 2 now only need to be set.
Every group of direct current biasing testing circuit 2 includes bleeder circuit 21, filter circuit 23, integrating circuit 25 and signal condition electricity
Road 27.Control circuit 1 includes A/D change-over circuit 11 and controller 13.
The input of bleeder circuit 21 connects corresponding inverter circuit phase voltage outfan, for inverter circuit is defeated
Export after going out phase voltage partial pressure.
The input of filter circuit 23 is connected with the outfan of bleeder circuit 21, for the exchange that bleeder circuit 21 is exported
Voltage is filtered.The input of integrating circuit 25 is connected with the outfan of filter circuit 23, for defeated to filter circuit 23
Go out voltage to be integrated.The input of signal conditioning circuit 27 is connected with the outfan of integrating circuit 25, for by integrating circuit
The voltage signal of 25 outputs nurses one's health into the voltage signal that A/D change-over circuit 11 can identify.The input of A/D change-over circuit 11 with
The outfan of signal conditioning circuit 27 connects, the signal for exporting signal conditioning circuit 27 carry out exporting after analog digital conversion to
Controller 13.The signal input part of controller 13 is connected with the outfan of A/D change-over circuit 11, for gathering A/D change-over circuit
Polarity and size to judge the DC component in inverter circuit 3 output voltage for the digital signal of output, and according to judged result
The modulating wave of the switching tube of inverter circuit 3 is added and the opposite polarity biased electrical of DC component in inverter circuit output voltage
Pressure, to eliminate the DC component in inverter circuit 3 output voltage.Wherein, the outfan of controller 13 pass through drive circuit 4 with inverse
The control signal becoming circuit 3 connects.Each regulation of controller can reduce the DC offset voltage of inverter circuit output,
Due to there being the presence of integrating circuit, error free regulation can be accomplished, after multiple circulations, final whole system output does not exist
Bias voltage.
Fig. 3 to Fig. 6 shows the direct current biasing detection electricity of the DC component cancellation element according to further embodiment of this invention
The circuit theory diagrams on road.For simplicity Fig. 3 to Fig. 6 only direct current to be connected with the R phase output terminal of inverter circuit 3
Bias Detector circuit illustrates that the principle of direct current biasing testing circuit 2, S-phase and T-phase circuit are just the same, and this three-phase is mutually only
Vertical.
In embodiment shown in Fig. 3 to Fig. 6, bleeder circuit 21 is resistor voltage divider circuit, and inverter circuit is exported by it
High voltage（Rated voltage 380V）By being reduced to a less level.
In embodiment shown in Fig. 3 to Fig. 6, direct current biasing testing circuit includes voltage follower circuit 22, voltage follow
The input of circuit 22 is connected with the outfan of bleeder circuit 21, and the outfan of voltage follower circuit 22 is defeated with filter circuit 23
Enter end to connect.Voltage follower circuit 22 can improve input impedance, in case prime causes measurement because of output current scarce capacity
Inaccurate.
Further, the direct current biasing testing circuit of the present embodiment includes overvoltage crowbar 24, overvoltage crowbar 24
Including the first clamp diode D12 being serially connected and the second clamp diode D12 '；The negative pole of the first clamp diode D12 with
Default positive voltage rotection thresholds connect, and the negative pole of the positive pole of the first clamp diode D12 and the second clamp diode D12 ' is even
Connect, the positive pole of the second clamp diode D12 ' is connected with default negative voltage rotection thresholds；First clamp diode D12 and second
The common contact of clamp diode D12 ' is connected to the input of voltage follower circuit 22.In the present embodiment, positive voltage rotection thresholds
For+12V, negative voltage rotection thresholds are -12V, if there is exception, can be by clamping to+12V or -12V, after protecting
The chip in face damages from overvoltage.
In embodiment shown in Fig. 3 to Fig. 6, filter circuit 23 be RC filter circuit, its by output power-frequency voltage and
High frequency common mode components are suppressed to very little amplitude, and the DC voltage component for previous stage will not decay.Integrating circuit 25
For amplifier integrating circuit.Because the RC time constant of AC compounent amplitude very little and amplifier integrating circuit is very big, so exchange point
The impact to integrating circuit output voltage for the amount is very little, and DC component can pass through integrating circuit one direct integral, integrating circuit
Output voltage can change up to amplifier power supply voltage always in one direction, if now DC component is corrected disappeared
Remove, then integrating circuit maintains current output level.Signal conditioning circuit 27 nurses one's health the output level of integrating circuit for inversion electricity
The scope that in the main control chip on road, A/D change-over circuit can identify.
Preferably, it is additionally provided with voltage follower circuit 26, voltage follower circuit between filter circuit 23 and integrating circuit 25
26 input is connected with the outfan of filter circuit 23, the input of the outfan of voltage follower circuit 26 and integrating circuit 25
Connect.Voltage follower circuit 26 can improve input impedance.
Controller 13 gathers the numeral letter of A/D change-over circuit 11 output with the carrier frequency of the switching tube in inverter circuit 3
Number, to judge the DC component of inverter circuit outfan（I.e. DC offset voltage）Polarity and size, and according to judged result
It is suitable with the DC component opposite polarity in inverter circuit output voltage, size that the modulating wave of the switching tube of inverter circuit is added
Bias voltage, to be corrected to DC offset voltage.Inverter circuit 3 can be for example single-phase semi-bridge inversion circuit, single-phase
Full bridge inverter or three-phase inverter bridge circuit, the switching tube in inverter circuit 3 can be IGBT or MOSFET.
Below in conjunction with the application example shown in Fig. 7 to Figure 10, more detailed description is made to the trimming process of controller 13.
Fig. 7 shows the waveform diagram of the sinusoidal modulation wave of the switching tube of the inverter circuit of standard, and its amplitude is 100V,
Frequency is 50Hz.During inverter circuit 3 work, because the factors such as drive signal time delay, device concordance difference lead to output voltage ripple
The waveform that shape obtains after LC filters filter high fdrequency components contains DC component, as shown in figure 8, the inversion shown in Fig. 8
The R phase output voltage waveforms of circuit contain the DC offset voltage of+20V.
Direct current biasing testing circuit according to embodiments of the present invention detects to the R phase output waveform shown in Fig. 8, sends out
Having showed it containing polarized is positive DC offset voltage, and this forward voltage signal integrates through integrating circuit, and output voltage is big
The little correcting value size that decide modulating wave, the two direct proportionality.Automatically controlling through closed loop circuit, finally in stable state
Under to modulating wave add -20V DC offset voltage, following Fig. 9 be corrected after modulating wave.After passing over correction
The adjustment of modulating wave under, inverter R phase output voltage waveforms after LC filters filter high fdrequency components, the output wave that obtains
Shape is as shown in Figure 10, it can be seen that output voltage waveforms now have not contained direct current biasing.Due to output voltage
Through not containing direct current biasing, the input signal of therefore integrating circuit is zero, and the output voltage of integrating circuit keeps constant, so
Modulation voltage in whole modulating wave keeps -20V constant, that is, so-called reaches stable state.Output voltage does not just contain direct current biasing
It is stable state, as long as output voltage has direct current biasing, the output signal of integrating circuit will change therewith, the correction of adjustment modulating wave
Amount, until reaching stable state.
Further, direct current biasing testing circuit includes initializing discharge circuit 29, the input of initializing discharge circuit 29
End is connected with the outfan of integrating circuit 25, for the output to integrating circuit 25 before electricity operation on DC component cancellation element
End electric discharge.Initializing discharge circuit 29 is mainly made up of chip U10, and before system operation, outside discharge control signal sends
To chip U10, make 2 feet and the conducting of 3 feet of chip U10, so that electric capacity two terminal shortcircuit of integrating circuit 25, integrating circuit 25
Outfan discharges, to prevent integrating circuit from carrying out the correction of mistake before system electrification operation containing remaining voltage.
By adjust integrating circuit 25 parameter, thus it is possible to vary the RC time constant of integration to change fast jogging speed, as far as possible
Reduce testing circuit response speed, full load regulated quantity is excessive causes the unstable of system to avoid in unexpected plus-minus.Excessive
RC can lead to system to respond slowly, and the time of correction is elongated, although and too small RC makes faster system response, frequently open some
Stop, or the occasion of some heavy loads impact, on the contrary easily because correction is too fast, and correcting value is too high and so that system is vibrated, and
Suitable RC time constant can solve problem above.
Claims (10)
1. the circuit of the DC component in detection alternating voltage is it is characterised in that include：
Bleeder circuit, for carrying out partial pressure to described alternating voltage；
Filter circuit, the input of described filter circuit is connected with the outfan of described bleeder circuit, for described partial pressure electricity
The output voltage on road is filtered；
Integrating circuit, the input of described integrating circuit is connected with the outfan of described filter circuit, for described filtered electrical
The output voltage on road is integrated.
2. the circuit of the DC component in detection alternating voltage according to claim 1 is it is characterised in that described integration is electric
Road is amplifier integrating circuit.
3. the circuit of the DC component in detection alternating voltage according to claim 1 is it is characterised in that described filtered electrical
Road is RC filter circuit.
4. the DC component cancellation element of inverter circuit output voltage is it is characterised in that described DC component cancellation element includes
Control circuit and one-to-one single group or three groups of direct currents are inclined with the output voltage of single-phase inversion circuit or three-phase inverting circuit
Put testing circuit, direct current biasing testing circuit described in every group includes bleeder circuit, filter circuit, integrating circuit and signal condition electricity
Road；Described control circuit includes A/D change-over circuit and controller；
The input of described bleeder circuit connects corresponding inverter circuit phase voltage outfan, for by described inverter circuit
Export after output phase voltage partial pressure；
The input of described filter circuit is connected with the outfan of described bleeder circuit, for the friendship that described bleeder circuit is exported
Stream voltage is filtered；
The input of described integrating circuit is connected with the outfan of described filter circuit, for the output electricity to described filter circuit
Pressure is integrated；
The input of described signal conditioning circuit is connected with the outfan of described integrating circuit, for exporting described integrating circuit
Voltage signal nurse one's health into the voltage signal that described A/D change-over circuit can identify；
The input of described A/D change-over circuit is connected with the outfan of described signal conditioning circuit, for by signal conditioning circuit
The signal of output exports to described controller after carrying out analog digital conversion；
The signal input part of described controller is connected with the outfan of described A/D change-over circuit, defeated for gathering A/D change-over circuit
The digital signal going out to judge polarity and the size of the DC component in described inverter circuit output voltage, and according to judged result
The modulating wave of the switching tube of inverter circuit is added and the opposite polarity biased electrical of DC component in inverter circuit output voltage
Pressure, to eliminate the DC component in inverter circuit output voltage.
5. DC component cancellation element according to claim 4 is it is characterised in that described integrating circuit integrates electricity for amplifier
Road.
6. the DC component cancellation element according to claim 4 or 5 is it is characterised in that direct current biasing described in every group detects
Circuit includes initializing discharge circuit, and the input of described initializing discharge circuit is connected with the outfan of described integrating circuit,
For the outfan electric discharge to described integrating circuit before electricity operation on described DC component cancellation element.
7. DC component cancellation element according to claim 4 is it is characterised in that direct current biasing testing circuit described in every group
Including voltage follower circuit, the input of described voltage follower circuit is connected with the outfan of described bleeder circuit, described voltage
The outfan of follow circuit is connected with the input of described filter circuit.
8. DC component cancellation element according to claim 7 is it is characterised in that direct current biasing testing circuit described in every group
Including overvoltage crowbar, described overvoltage crowbar includes the first clamp diode being serially connected and the second clamp two poles
Pipe；The negative pole of described first clamp diode is connected with default positive voltage rotection thresholds, and described first clamp diode is just
Pole is connected with the negative pole of described second clamp diode, and the positive pole of the second clamp diode is with default negative voltage rotection thresholds even
Connect；The common contact of the first clamp diode and the second clamp diode is connected to the input of described voltage follower circuit.
9. the DC component cancellation element according to claim 4 or 7 is it is characterised in that described filter circuit filters for RC
Circuit.
10. DC component cancellation element according to claim 4 is it is characterised in that described inverter circuit is single-phase semi-bridge
Inverter circuit, single-phase full bridge inverter circuit or three-phase inverter bridge circuit, described switching tube is IGBT or MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610931614.0A CN106452139A (en) | 2016-10-31 | 2016-10-31 | Circuit for testing DC component in AC voltage and device for eliminating DC component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610931614.0A CN106452139A (en) | 2016-10-31 | 2016-10-31 | Circuit for testing DC component in AC voltage and device for eliminating DC component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106452139A true CN106452139A (en) | 2017-02-22 |
Family
ID=58177392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610931614.0A Pending CN106452139A (en) | 2016-10-31 | 2016-10-31 | Circuit for testing DC component in AC voltage and device for eliminating DC component |
Country Status (1)
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|---|---|
| CN (1) | CN106452139A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579674A (en) * | 2017-09-29 | 2018-01-12 | 厦门科华恒盛股份有限公司 | A kind of method and system for controlling sample circuit zero bias |
| CN112946549A (en) * | 2021-01-28 | 2021-06-11 | 杭州西力智能科技股份有限公司 | Method for correcting direct current component in alternating current system |
| CN113746310A (en) * | 2021-11-05 | 2021-12-03 | 艾乐德电子（南京）有限公司 | Device and method for eliminating direct current component in alternating current power supply output periodic symmetrical waveform |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020145897A1 (en) * | 2001-03-30 | 2002-10-10 | Sanyo Denki Co., Ltd. | Controlled rectifier equipment with sinusoidal waveform supply current |
| CN101325378A (en) * | 2008-03-26 | 2008-12-17 | 杭州中信网络自动化有限公司 | Circuit for eliminating DC component |
| CN101951180A (en) * | 2010-08-31 | 2011-01-19 | 江苏艾索新能源股份有限公司 | DC content detection and control circuit for output side of synchronized inverter |
| CN104808880A (en) * | 2014-01-29 | 2015-07-29 | 辛纳普蒂克斯显像装置株式会社 | Touch detecting circuit and semiconductor integrated circuit using the same |
| CN206149160U (en) * | 2016-10-31 | 2017-05-03 | 上海新时达电气股份有限公司 | Detect dc component's among alternating voltage circuit and remove device thereof |
-
2016
- 2016-10-31 CN CN201610931614.0A patent/CN106452139A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020145897A1 (en) * | 2001-03-30 | 2002-10-10 | Sanyo Denki Co., Ltd. | Controlled rectifier equipment with sinusoidal waveform supply current |
| CN101325378A (en) * | 2008-03-26 | 2008-12-17 | 杭州中信网络自动化有限公司 | Circuit for eliminating DC component |
| CN101951180A (en) * | 2010-08-31 | 2011-01-19 | 江苏艾索新能源股份有限公司 | DC content detection and control circuit for output side of synchronized inverter |
| CN104808880A (en) * | 2014-01-29 | 2015-07-29 | 辛纳普蒂克斯显像装置株式会社 | Touch detecting circuit and semiconductor integrated circuit using the same |
| CN206149160U (en) * | 2016-10-31 | 2017-05-03 | 上海新时达电气股份有限公司 | Detect dc component's among alternating voltage circuit and remove device thereof |
Non-Patent Citations (1)
| Title |
|---|
| 吴淑忠等: "EMP对电子电路的影响及其防护", 《电子质量》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579674A (en) * | 2017-09-29 | 2018-01-12 | 厦门科华恒盛股份有限公司 | A kind of method and system for controlling sample circuit zero bias |
| CN112946549A (en) * | 2021-01-28 | 2021-06-11 | 杭州西力智能科技股份有限公司 | Method for correcting direct current component in alternating current system |
| CN113746310A (en) * | 2021-11-05 | 2021-12-03 | 艾乐德电子（南京）有限公司 | Device and method for eliminating direct current component in alternating current power supply output periodic symmetrical waveform |
| CN113746310B (en) * | 2021-11-05 | 2022-02-08 | 艾乐德电子（南京）有限公司 | Device and method for eliminating direct current component in alternating current power supply output periodic symmetrical waveform |
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Application publication date: 20170222 |
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