CN105449645A - Output protection circuit of signal generator - Google Patents
Output protection circuit of signal generator Download PDFInfo
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- CN105449645A CN105449645A CN201511023924.4A CN201511023924A CN105449645A CN 105449645 A CN105449645 A CN 105449645A CN 201511023924 A CN201511023924 A CN 201511023924A CN 105449645 A CN105449645 A CN 105449645A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
Abstract
The invention discloses an output protection circuit of signal generator. The output protection circuit comprises a singlechip, a sampling circuit module, a comparison circuit module, a control circuit module and an output circuit module. The sampling circuit module acquires a current of an output circuit of the signal generator, and the current is transferred into a voltage value and then fed back to upper and lower limit values controlled and outputted by the comparison circuit module and the singlechip to be compared, wherein when the voltage value is greater than the upper limit value or when the voltage value is less than the lower limit value, the control circuit module outputs a control signal, and the output circuit module outputs to the outside based on the control signal and a signal of the signal generator. The output protection circuit of the signal generator provided by the invention is realized by adopting hardware, and compared with software, the starting speed is fast and the protective capability is strong, so that an instrument can protect within a us-level time, and can also protect during normal output under overvoltage and overcurrent states.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of output protection circuit of signal generator.
Background technology
Signal generator, as its name suggests, it is the instrument producing signal, so be output class instrument, but research and develop at electronics, the use occasions such as Scientific Research in University Laboratory there will be user sometimes and it are docked with another output class instrument (such as DC power supply) by mistake, great injury will be produced to device when there is no output protection circuit like this and even damage instrument, and along with the needs developed, the power output of signal generator is increasing, damage can be caused even to other instrument, but recognize that current signal generator on the market all only has the function of output signal according to author, rarely has band output protecting function, and have the signal generator of band defencive function also to only have protection of actively simply fixing a point (being such as fixed on voltage more than 24V just meeting starting protection), so still the output protection problem of signal generator is not solved completely.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of output protection circuit of signal generator is provided.
The technical solution used in the present invention is:
An output protection circuit for signal generator, it comprises single-chip microcomputer, sample circuit module, comparison circuit module, control circuit module and output circuit module;
Described sample circuit module is in order to be a sampling voltage by the current conversion in output loop and to feed back to comparison circuit module, described single-chip microcomputer has upper limit pin, lower limit pin, overload pin and startup control pin, upper limit pin is provided for the higher limit compared with sampling voltage to comparison circuit module, lower limit pin is provided for the lower limit compared with sampling voltage to comparison circuit module, the higher limit that sampling voltage provides with single-chip microcomputer by described comparison circuit module respectively and lower limit compare, the output connection control circuit module of comparison circuit module, the output level of control circuit module circuit module based on the comparison carries out control action, namely when detection signal is numerically greater than higher limit or is less than lower limit when a fault has occurred, the disconnection output relay of output circuit module described in described control circuit module controls cuts off output signal, feed back the overload pin of an overload signal to single-chip microcomputer simultaneously, single-chip microcomputer is based on overload signal prompting overload, described output circuit module comprises output relay and signal output connector, and output relay has a switch control pin, input pin and output pin, the output pin connection signal out connector of output relay,
Shown sample circuit module comprises the second amplifier, 6th electric capacity, 7th electric capacity, 8th electric capacity, 5th resistance, 7th resistance, 8th resistance, 9th resistance, tenth resistance, 11 resistance, 12 resistance, 13 resistance and the 14 resistance, one end of 14 resistance connects the input pin of output relay and one end of the 13 resistance respectively, the other end of the 14 resistance connects one end of the 12 resistance and the output of signal generator, the other end of the 13 resistance connects one end of the 9th resistance and one end of the 11 resistance respectively, the other end ground connection of the 11 resistance, the other end of the 9th resistance connects the negative input end of the second amplifier and one end of the 5th resistance respectively, the other end of the 5th resistance connects the output of the second amplifier, the other end of the 12 resistance connects one end of the 8th resistance and one end of the tenth resistance respectively, the other end ground connection of the tenth resistance, the other end of the 8th resistance connects one end of the 7th resistance and the positive input terminal of the second amplifier respectively, the other end ground connection of the 7th resistance, the positive power source terminal of the second amplifier connects one end of positive supply and the 8th electric capacity respectively, the other end ground connection of the 8th electric capacity, the negative power end of the second amplifier connects one end of the 6th electric capacity respectively, one end of 7th electric capacity and negative supply, the other end of the 6th electric capacity and the other end of the 7th electric capacity ground connection respectively,
Described comparison circuit comprises the first resistance, 3rd resistance, first electric capacity, second electric capacity, first diode, second diode, first comparator and the second comparator, the output of described second amplifier connects one end of the 3rd resistance, the other end of the 3rd resistance connects the negative input end of the first comparator and the positive input terminal of the second comparator respectively, the positive input terminal of the first comparator connects upper limit pin, the negative input end of the second comparator connects lower limit pin, the positive power source terminal of the first comparator connects one end and the positive supply of the first electric capacity respectively, the other end ground connection of the first electric capacity, the negative power end of the first comparator connects one end and the negative supply of the second electric capacity respectively, the other end ground connection of the second electric capacity, the output of the first comparator connects the positive pole of the first diode, the output of the second comparator connects the positive pole of the second diode, the negative pole of the first diode is connected one end of the first resistance respectively with the negative pole of the second diode, the base stage of the first triode of the other end connection control circuit module of the first resistance,
Described control circuit module comprises the second resistance, 4th resistance, 6th resistance, 3rd electric capacity, 4th electric capacity, 5th electric capacity, first triode and the second triode, the startup of single-chip microcomputer controls pin and connects one end of the second resistance and one end of the 3rd electric capacity, the other end ground connection of the 3rd electric capacity, the other end of the second resistance connects the emitter of the first triode and one end of the 4th electric capacity respectively, the other end ground connection of the 4th electric capacity, the base stage of the first triode connects the overload pin of single-chip microcomputer and one end of the 6th resistance respectively, the other end ground connection of the 6th resistance, the collector electrode of the first triode connects one end of the 4th resistance, the other end of the 4th resistance connects the base stage of the second triode, the base stage of the second triode is by the 5th capacity earth, the grounded emitter of the second triode, the collector electrode of the second triode connects the switch control pin of output relay.
Described first triode is PNP type triode.
Described second triode is NPN type triode.
Described overload pin is the interrupt pin of single-chip microcomputer.
Described first comparator and the second comparator are replaced by the voltage feedback type amplifier AD8056 of two-way.
Described second amplifier is operational amplifier LMH6609.
The present invention adopts above technical scheme, when user operation panel opening switch, startup is controlled pin and puts 1 by single-chip microcomputer, when there is no abnormal conditions, overload pin is the 0, first triode, the equal conducting of the second triode, and the switch control pin of output relay is 0, output relay adhesive, signal normally exports; Electric current in output loop (no matter be forward or oppositely) will be converted into a sampling voltage by sample circuit, and higher limit and lower limit are all by a monolithic processor controlled DAC value, (this value protection size of current is relevant).Suppose now to have a reverse electric current and current value to exceed setting current value, also be sampling voltage < lower limit, now export a high level from comparison circuit module, make the first triode cut-off, such second triode also will end, output relay disconnects, and then closes output signal.In like manner, if a forward current and current value exceed setting current value, sampling voltage > higher limit, comparison circuit module exports a high level, the first triode cut-off can be made equally, such second triode also will end, and finally cause output relay to disconnect, and output signal is closed.And while output relay disconnects; control circuit module all can export the overload pin that an overload signal feeds back to the correspondence of single-chip microcomputer; this overload pin is the middle fracture of single-chip microcomputer; like this while closedown output signal; single-chip microcomputer also can receive the signal of load abnormal, and single-chip microcomputer is started control pin and sets to 0, and onscreen cue " load has abnormal conditions "; so far, the whole process of protection is completed.
The present invention adopts hard-wired, faster than software startup speed, and protective capability is strong, can allow instrument within the time of us level, play protection and all play protection when normal output in overvoltage and over-current state.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details;
The theory diagram of the output protection circuit of a kind of signal generator of Fig. 1 the present invention;
The electrical block diagram of the output protection circuit of a kind of signal generator of Fig. 2 the present invention.
Embodiment
As shown in the figures 1 and 2, the present invention includes single-chip microcomputer U0, sample circuit module, comparison circuit module, control circuit module and output circuit module;
Described sample circuit module is in order to be a sampling voltage by the current conversion in output loop and to feed back to comparison circuit module, described single-chip microcomputer has upper limit pin+VERF, lower limit pin-VERF, overload pin OVERLOAD and startup control pin SET, upper limit pin+VERF is provided for the higher limit compared with sampling voltage to comparison circuit module, lower limit pin-VERF is provided for the lower limit compared with sampling voltage to comparison circuit module, the higher limit that sampling voltage provides with single-chip microcomputer U0 by described comparison circuit module respectively and lower limit compare, the output connection control circuit module of comparison circuit module, the output level of control circuit module circuit module based on the comparison carries out control action, namely when detection signal is numerically greater than higher limit or is less than lower limit when a fault has occurred, the disconnection output relay U3 of output circuit module described in described control circuit module controls cuts off output signal, feed back the overload pin OVERLOAD of an overload signal to single-chip microcomputer U0 simultaneously, single-chip microcomputer U0 is based on overload signal prompting overload, described output circuit module comprises output relay U3 and signal output connector U4, and output relay U3 has a switch control pin ON_OFF, input pin A3 and output pin A4, the output pin A4 connection signal out connector U4 of output relay U3,
Shown sample circuit module comprises the second amplifier U2, 6th electric capacity C6, 7th electric capacity C7, 8th electric capacity C8, 5th resistance R5, 7th resistance R7, 8th resistance R8, 9th resistance R9, tenth resistance R10, 11 resistance R11, 12 resistance R12, 13 resistance R13 and the 14 resistance R14, one end of 14 resistance R14 connects the input pin A3 of output relay U3 and one end of the 13 resistance R13 respectively, the other end of the 14 resistance R14 connects one end of the 12 resistance R12 and the output WAVE of signal generator, the other end of the 13 resistance R13 connects one end of the 9th resistance R9 and one end of the 11 resistance R11 respectively, the other end ground connection of the 11 resistance R11, the other end of the 9th resistance R9 connects the negative input end of the second amplifier U2 and one end of the 5th resistance R5 respectively, the other end of the 5th resistance R5 connects the output of the second amplifier U2, the other end of the 12 resistance R12 connects one end of the 8th resistance R8 and one end of the tenth resistance R10 respectively, the other end ground connection of the tenth resistance R10, the other end of the 8th resistance R8 connects one end of the 7th resistance R7 and the positive input terminal of the second amplifier U2 respectively, the other end ground connection of the 7th resistance R7, the positive power source terminal of the second amplifier U2 connects one end of positive supply+5V and the 8th electric capacity C8 respectively, the other end ground connection of the 8th electric capacity C8, the negative power end of the second amplifier U2 connects one end of the 6th electric capacity C6 respectively, one end of 7th electric capacity C7 and negative supply-5V, the other end of the 6th electric capacity C6 and the other end of the 7th electric capacity C7 ground connection respectively,
Described comparison circuit comprises the first resistance R1, 3rd resistance R3, first electric capacity C1, second electric capacity C2, first diode Q1, second diode Q2, first comparator U1A and the second comparator U1B, the output of described second amplifier U2 connects one end of the 3rd resistance R3, the other end of the 3rd resistance R3 connects the negative input end of the first comparator U1A and the positive input terminal of the second comparator U1B respectively, the positive input terminal of the first comparator U1A connects upper limit pin, the negative input end of the second comparator U1B connects lower limit pin, the positive power source terminal of the first comparator U1A connects one end and the positive supply of the first electric capacity C1 respectively, the other end ground connection of the first electric capacity C1, the negative power end of the first comparator C1 connects one end and the negative supply-5V of the second electric capacity C2 respectively, the other end ground connection of the second electric capacity C2, the output of the first comparator U1A connects the positive pole of the first diode D1, the output of the second comparator U1B connects the positive pole of the second diode D2, negative pole and the negative pole of the second diode D2 of the first diode D1 are connected one end of the first resistance R1 respectively, the base stage of the first triode Q1 of the other end connection control circuit module of the first resistance R1,
Described control circuit module comprises the second resistance R2, 4th resistance R4, 6th resistance R6, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, first triode Q1 and the second triode Q2, the startup of single-chip microcomputer U0 controls pin SET and connects one end of the second resistance R2 and one end of the 3rd electric capacity C3, the other end ground connection of the 3rd electric capacity C3, the other end of the second resistance R2 connects the emitter of the first triode Q1 and one end of the 4th electric capacity C4 respectively, the other end ground connection of the 4th electric capacity C4, the base stage of the first triode Q1 connects the overload pin OVERLOAD of single-chip microcomputer U0 and one end of the 6th resistance R6 respectively, the other end ground connection of the 6th resistance R6, the collector electrode of the first triode Q1 connects one end of the 4th resistance R4, the other end of the 4th resistance R4 connects the base stage of the second triode Q2, the base stage of the second triode Q2 is by the 5th electric capacity C5 ground connection, the grounded emitter of the second triode Q2, the collector electrode of the second triode Q2 connects the switch control pin ON_OFF of output relay U3.
Described first triode Q1 is PNP type triode.
Described second triode Q2 is NPN type triode.
Described overload pin OVERLOAD is the interrupt pin of single-chip microcomputer U0.
Described first comparator U1A and the second comparator U1B is replaced by the voltage feedback type amplifier AD8056 of two-way.
Described second amplifier U2 is operational amplifier LMH6609.
Just operation principle of the present invention elaborates below:
When user operation panel opening switch, startup is controlled pin and puts 1 by single-chip microcomputer, and when not having abnormal conditions, overload pin is the equal conducting of 0, Q1, Q2, and the switch control pin of output relay is 0, relay U3 adhesive, and signal normally exports, electric current in output loop (no matter be forward or oppositely) is converted into a sampling voltage by the sample resistance R14 of sample circuit, be set to V1(can record on R3), and the lower limit pin that the corresponding single-chip microcomputer U0 of-VREF and+VREF controls and upper limit pin, the higher limit that upper limit pin provides and the lower limit that lower limit pin provides are the DAC values (this value is determined by the protective current size of R14 and design) controlled by single-chip microcomputer U0, suppose now to have a reverse electric current and current value to exceed setting current value, also be the lower limit of V1 <-VREF, now from the output pin of U1A by output high level, pass through D1, R1 makes Q1 end, such Q2 also will end, relay disconnects, output signal is closed, in like manner, if the higher limit of a forward current V1 >+VREF, U1B exports a high level, pass through D2, R2 can make Q1 end equally, output relay U3 is finally caused to disconnect, output signal is closed, while output relay U3 disconnects, the overload pin OVERLOAD of overload signal to the correspondence of single-chip microcomputer U0 will be fed back, (attention is middle fracture to the middle fracture of this overload pin OVERLOAD corresponding monolithic U0 machine, common I/O port), like this while closedown output signal, single-chip microcomputer U0 also can receive the signal of load abnormal, resolutely startup is controlled pin to set to 0, and onscreen cue " load has abnormal conditions ", so far, complete the whole process of protection.
What more than analyze is the protection process detecting electric current; voltage detecting protection process is similar; just detect without the need to using sample resistance to be voltage by current conversion; the voltage that the step-down of direct use electric resistance partial pressure obtains compares with ± value up and down that VREF is corresponding; other some work principles are as good as, and repeat no more here.It needs to be noted ± value up and down that VREF is corresponding is along with the amplitude Intelligent Single-Chip Based of signalization adjusts, and ensure that normal signal can play a protective role in abnormal conditions while exporting again.
In this programme, the type selecting of operational amplifier can consider high frequency, fast, the device of Low Drift Temperature, low bias voltage, in this programme, U1's is AD8056(voltage feedback type amplifier), U2's is LMH6609(operational amplifier), and the value of R10 ~ R13 is out considered outside dividing potential drop, also should be noted that power problem, after all output voltage the highest have reach 20Vpp, amplifier need be operated in positive-negative power pattern in addition.
The present invention adopts hard-wired, faster than software startup speed, and protective capability is strong, can allow instrument within the time of us level, play protection and all play protection when normal output in overvoltage and over-current state.
Claims (6)
1. an output protection circuit for signal generator, is characterized in that: it comprises single-chip microcomputer, sample circuit module, comparison circuit module, control circuit module and output circuit module;
Described sample circuit module is in order to be a sampling voltage by the current conversion in output loop and to feed back to comparison circuit module, described single-chip microcomputer has upper limit pin, lower limit pin, overload pin and startup control pin, upper limit pin is provided for the higher limit compared with sampling voltage to comparison circuit module, lower limit pin is provided for the lower limit compared with sampling voltage to comparison circuit module, the higher limit that sampling voltage provides with single-chip microcomputer by described comparison circuit module respectively and lower limit compare, the output connection control circuit module of comparison circuit module, the output level of control circuit module circuit module based on the comparison carries out control action, namely when detection signal is numerically greater than higher limit or is less than lower limit when a fault has occurred, the disconnection output relay of output circuit module described in described control circuit module controls cuts off output signal, feed back the overload pin of an overload signal to single-chip microcomputer simultaneously, single-chip microcomputer is based on overload signal prompting overload, described output circuit module comprises output relay and signal output connector, and output relay has a switch control pin, input pin and output pin, the output pin connection signal out connector of output relay,
Shown sample circuit module comprises the second amplifier, 6th electric capacity, 7th electric capacity, 8th electric capacity, 5th resistance, 7th resistance, 8th resistance, 9th resistance, tenth resistance, 11 resistance, 12 resistance, 13 resistance and the 14 resistance, one end of 14 resistance connects the input pin of output relay and one end of the 13 resistance respectively, the other end of the 14 resistance connects one end of the 12 resistance and the output of signal generator, the other end of the 13 resistance connects one end of the 9th resistance and one end of the 11 resistance respectively, the other end ground connection of the 11 resistance, the other end of the 9th resistance connects the negative input end of the second amplifier and one end of the 5th resistance respectively, the other end of the 5th resistance connects the output of the second amplifier, the other end of the 12 resistance connects one end of the 8th resistance and one end of the tenth resistance respectively, the other end ground connection of the tenth resistance, the other end of the 8th resistance connects one end of the 7th resistance and the positive input terminal of the second amplifier respectively, the other end ground connection of the 7th resistance, the positive power source terminal of the second amplifier connects one end of positive supply and the 8th electric capacity respectively, the other end ground connection of the 8th electric capacity, the negative power end of the second amplifier connects one end of the 6th electric capacity respectively, one end of 7th electric capacity and negative supply, the other end of the 6th electric capacity and the other end of the 7th electric capacity ground connection respectively,
Described comparison circuit comprises the first resistance, 3rd resistance, first electric capacity, second electric capacity, first diode, second diode, first comparator and the second comparator, the output of described second amplifier connects one end of the 3rd resistance, the other end of the 3rd resistance connects the negative input end of the first comparator and the positive input terminal of the second comparator respectively, the positive input terminal of the first comparator connects upper limit pin, the negative input end of the second comparator connects lower limit pin, the positive power source terminal of the first comparator connects one end and the positive supply of the first electric capacity respectively, the other end ground connection of the first electric capacity, the negative power end of the first comparator connects one end and the negative supply of the second electric capacity respectively, the other end ground connection of the second electric capacity, the output of the first comparator connects the positive pole of the first diode, the output of the second comparator connects the positive pole of the second diode, the negative pole of the first diode is connected one end of the first resistance respectively with the negative pole of the second diode, the base stage of the first triode of the other end connection control circuit module of the first resistance,
Described control circuit module comprises the second resistance, 4th resistance, 6th resistance, 3rd electric capacity, 4th electric capacity, 5th electric capacity, first triode and the second triode, the startup of single-chip microcomputer controls pin and connects one end of the second resistance and one end of the 3rd electric capacity, the other end ground connection of the 3rd electric capacity, the other end of the second resistance connects the emitter of the first triode and one end of the 4th electric capacity respectively, the other end ground connection of the 4th electric capacity, the base stage of the first triode connects the overload pin of single-chip microcomputer and one end of the 6th resistance respectively, the other end ground connection of the 6th resistance, the collector electrode of the first triode connects one end of the 4th resistance, the other end of the 4th resistance connects the base stage of the second triode, the base stage of the second triode is by the 5th capacity earth, the grounded emitter of the second triode, the collector electrode of the second triode connects the switch control pin of output relay.
2. the output protection circuit of a kind of signal generator according to claim 1, is characterized in that: described first triode is PNP type triode.
3. the output protection circuit of a kind of signal generator according to claim 1, is characterized in that: described second triode is NPN type triode.
4. the output protection circuit of a kind of signal generator according to claim 1, is characterized in that: described overload pin is the interrupt pin of single-chip microcomputer.
5. the output protection circuit of a kind of signal generator according to claim 1, is characterized in that: described first comparator and the second comparator are replaced by the voltage feedback type amplifier AD8056 of two-way.
6. the output protection circuit of a kind of signal generator according to claim 1, is characterized in that: described second amplifier is operational amplifier LMH6609.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511023924.4A CN105449645B (en) | 2015-12-31 | 2015-12-31 | A kind of output protection circuit of signal generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511023924.4A CN105449645B (en) | 2015-12-31 | 2015-12-31 | A kind of output protection circuit of signal generator |
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| CN105449645A true CN105449645A (en) | 2016-03-30 |
| CN105449645B CN105449645B (en) | 2018-06-12 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106656147A (en) * | 2016-09-14 | 2017-05-10 | 北京控制工程研究所 | Remote control interface output protective device |
| CN106938616A (en) * | 2017-03-27 | 2017-07-11 | 北京清畅电力技术股份有限公司 | Wall-mounted alternating-current charging pile and charging method |
| CN108092235A (en) * | 2017-12-08 | 2018-05-29 | 九牧智能厨卫（安徽）有限公司 | The pure hardware protection device of a kind of over current of motor or stall, method and its application |
| CN113489317A (en) * | 2021-05-26 | 2021-10-08 | 中国电子科技集团公司第四十一研究所 | Program-controlled output power control circuit |
| CN108092235B (en) * | 2017-12-08 | 2024-04-26 | 南安九牧智能晾晒科技有限公司 | Pure hardware protection device and method for motor overcurrent or stalling and application thereof |
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| CN104714174A (en) * | 2013-12-11 | 2015-06-17 | 国网上海市电力公司 | Detection and alarming system for rechargeable battery |
| CN204408280U (en) * | 2015-03-04 | 2015-06-17 | 深圳市芯电威科技有限公司 | A kind of audio-frequency power amplifier overload protecting circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106656147A (en) * | 2016-09-14 | 2017-05-10 | 北京控制工程研究所 | Remote control interface output protective device |
| CN106656147B (en) * | 2016-09-14 | 2020-02-14 | 北京控制工程研究所 | Remote control interface output protection device |
| CN106938616A (en) * | 2017-03-27 | 2017-07-11 | 北京清畅电力技术股份有限公司 | Wall-mounted alternating-current charging pile and charging method |
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| CN108092235A (en) * | 2017-12-08 | 2018-05-29 | 九牧智能厨卫（安徽）有限公司 | The pure hardware protection device of a kind of over current of motor or stall, method and its application |
| CN108092235B (en) * | 2017-12-08 | 2024-04-26 | 南安九牧智能晾晒科技有限公司 | Pure hardware protection device and method for motor overcurrent or stalling and application thereof |
| CN113489317A (en) * | 2021-05-26 | 2021-10-08 | 中国电子科技集团公司第四十一研究所 | Program-controlled output power control circuit |
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| Publication number | Publication date |
|---|---|
| CN105449645B (en) | 2018-06-12 |
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