CN102023286A - Zero current detection circuit for series resonance charging source and design method thereof - Google Patents
Zero current detection circuit for series resonance charging source and design method thereof Download PDFInfo
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Abstract
The invention relates to a detection circuit for charging source working state and a design method thereof, particularly to a zero current detection circuit for a series resonance charging source and the design method thereof. The invention solves the problem of the prior art that the converter switch nonzero turn-off is caused by the capacitor charging source resonant frequency drift designed based on series resonance switch convertor technique. The invention provides a detection circuit guiding a series resonance convertor type capacitor charging source convertor switch to keep working under the condition of zero current. The technical scheme is that a resonance voltage signal is generated by rectifying a resonance current signal and bias adjusting direct current, an amplitude-adjustable threshold voltage is generated by rectifying a convertor switch signal of the charging source, and the resonance voltage signal and a switch voltage signal are sent to a comparator so as to treat correspondingly according to a comparison result. The invention is mainly applied to the situation at zero current switch state in the design process of a series resonance convertor type capacitor charging source.
Description
Technical field
The present invention relates to a kind of charge power supply Working state checking circuit and method for designing, particularly relate to a kind of series resonance charge power supply zero current condition testing circuit and method for designing.
Background technology
The high-voltage capacitor charge power supply is based on the high-frequency converter technical design, and the topology of transducer is series resonant switched transformer configuration.The characteristics of this topology are converter switches actions when resonance current is zero, and the ON time of converter switches and resonance frequency are fixed value, and have certain relation.Switch turn-offs when getting back to zero the first time that each resonance current takes place, and just so-called Zero Current Switch (soft switch) has avoided switch to switch when its electric current non-zero and the so-called hard switching phenomenon that occurs.The change that relies on switching frequency is regulated in power supply output.Yet resonance frequency is inevitably drifted about in the high-voltage charging engineering, makes not action when resonance current is zero of converter switches, causes the characteristic of transducer to change.Therefore design a kind of automatic monitoring and judge the circuit of resonance frequency drift, it can be when the transducer of charge power supply be working properly no-output, when the existing non-zero current switch situation of transducer, export a pulse voltage signal.Can adjust the converter switches state with this signal, recover normal characteristic.
" a kind of employing series resonance topology in the industrial electronic journal, fixing ON time, the capacitor charging power supply of variable frequency control and Zero Current Switch " (A capacitor-charging power supple using a series-resonant lopology, constant on-time/vfariabe frequenency control, and zero-current switching IEEE Transactions on Industrial Electronics, Vol.38, No.6, December, 1991), this capacitor charging power supply has been done detailed description.But power supply is under its situation that the output transformer no-load voltage ratio is big and load variations is also big, and the distributed capacitance of transformer can make resonance frequency change.Transducer is switch during zero current no longer, and the current stress of converter switches device and electromagnetic radiation are strengthened.This phenomenon this article has been done to ignore processing.Therefore, this class capacitor charging power supply is all used the current parameters value that strengthens the converter switches device, locates the reply problem, obviously also unresolved electromagnetic radiation.Way is to use other converter topology design charge power supply instead in addition.At " application of series parallel resonance transducer in capacitor charging power supply " (Using the series parallel resonant converter in capacitor charging applications.The 7th Applied Power Electronics Conference and Exposition, Barry C Pollard, Boston, M A, USA, 1992) in, with and with series-multiple connection controlled resonant converter mode design capacitance device charge power supply, because principle of work is different thereby do not relate to above-mentioned phenomenon.But this capacitor charging power supply is not as good as adopting series resonance Zero Current Switch converter design capacitor charging power to use extensively.
Problem to occurring like this: one is to ignore, and another takes other circuit topological structure design.The reason of ignoring is that series resonance Zero Current Switch transducer is to rely on the floatless switch time, and the mode that changes switching frequency is worked.And there are fixing corresponding relation in switching time and resonance frequency.The present invention is directed to the drift of resonance frequency, regulate the converter switches time automatically, can keep its fixing corresponding relation.
Summary of the invention
The objective of the invention is to overcome in the prior art based on resonance frequency drift in the capacitor charging power supply of series resonant switched transducer technical design, the problem that the converter switches non-zero that causes turn-offs, a kind of zero current detection circuit and method for designing of series resonance charge power supply are provided, when the non-zero switch occurring, voltage signal of circuit output, this signal is used to regulate the converter switches time, and the switch of transducer is turn-offed, and returns the resonance current zero passage and carves.Move in the time of can making converter switches in the series resonance charge power supply remain at zero current.
For achieving the above object, the technical solution used in the present invention is:
A kind of zero current detection circuit of series resonance charge power supply comprises comparer A1; The resonance signal rectification circuit is used for that series resonance capacitor charge power supply resonance current signal (mutual inductor T2 obtains) is carried out rectification and handles; The resonance signal dc bias circuit is used for the voltage signal biasing and is set to the required circuit of circuit; The switching signal rectification circuit is used for converter switches signal to series resonant converter formula capacitor charging power supply and carries out rectification and handle, switching signal take from numeral or analog controller output the converter switches drive signal; The switching signal amplitude regulating circuit is used for voltage signal is carried out amplitude adjusted, produces adjustable threshold voltage; Resonance signal rectification circuit, resonance signal dc bias circuit, comparer are electrically connected in proper order, and switching signal rectification circuit, switching signal amplitude regulating circuit, comparer are electrically connected in proper order;
Described resonance signal rectification circuit comprises that the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 form full-bridge circuit, and the first diode D1 negative electrode is connected with the second diode D2 anode, and extension line is as the full-bridge circuit input end; The 3rd diode D3 negative electrode is connected with the 4th diode D4 anode, and extension line is as another input end of full-bridge circuit; The first diode D1 anode is connected with the 3rd diode D3 anode, and extension line is as the full-bridge circuit negative pole; The second diode D2 negative electrode is connected with the 4th diode D4 negative electrode, extension line is as the full-bridge circuit positive pole, described resonance signal dc bias circuit comprises the biasing circuit that first resistance (R1), second resistance (R2) and the 3rd resistance (R3) are formed, described switching signal rectification circuit comprises the 5th diode D5, the 6th diode D6, described switching signal amplitude regulating circuit comprises the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), slide rheostat (W1), metal-oxide-semiconductor (T1), electric capacity (C1), the scalable emitter follower circuit of composition.The anodal output of full-bridge circuit inserts comparer (A1) negative pole, the output of full-bridge circuit negative pole is connected with second resistance (R2), the 3rd resistance (R3) link, second resistance (R2) termination is gone into (5V) power supply, an other end is connected with the 3rd resistance (R3), and first resistance (R1) is connected in parallel on the output terminal of full-bridge circuit; The 5th diode D5, the 6th diode D6 forms half-bridge circuit, the half-bridge circuit output terminal is connected with the 5th resistance (R5), the 5th resistance (R5) other end is connected with the grid of metal-oxide-semiconductor (T1), the 6th resistance (R6) connects, the source electrode of metal-oxide-semiconductor (T1) is connected with slide rheostat (W1), slide rheostat (W1) other end is connected with the 4th resistance (R4), the 4th resistance (R4) other end and the 6th resistance (R6) other end, the 3rd resistance (R3) other end, electric capacity (C1) end altogether, electric capacity (C1) other end inserts comparer (A1) positive pole, slide rheostat (W1) inserts the comparer positive pole with the 4th resistance R 4 links (A1), and the drain electrode of metal-oxide-semiconductor (T1) is connected with the 5V power supply; Comparer (A1) output terminal is connected with series resonance charge power supply digitial controller input end b, and the half-bridge circuit input end is connected with series resonance charge power supply digitial controller output terminal a.
A kind of zero current detection circuit design method of series resonance charge power supply, at first carry out rectification and suitable resonance potential signal of direct current biasing adjusting generation by the resonance current signal that mutual inductor T2 is obtained, simultaneously the converter switches drive signal of series resonance charge power supply digitial controller output is carried out rectification and amplitude adjusted processing generation appropriate threshold voltage, then with resonance potential signal, threshold voltage signal input comparator, make corresponding processing according to result relatively, its step comprises:
1) resonance current Signal Processing: the mutual inductor T2 elementary by high-tension transformer detects resonance current, after diode D1~D4 rectification, become an appropriate monopolar voltage at resistance R 1 up conversion, and, be connected with comparer A1 negative pole by behind divider resistance R2, R3 direct current biasing to the suitable magnitude of voltage;
2) series resonance charge power supply converter switches signal Processing: this signal is taken from the switching pulse (amplitude is no more than 15V usually) of digitial controller output, be rectified into unipolar voltage by D5~D6, be connected to the positive pole of comparer A1, this voltage is the threshold voltage of device as a comparison, can make comparer A1 before the resonance current zero crossing, export negative pulse just by regulating W1, field effect transistor T1 is the emitter follower of establishing in order to cooperate this adjusting, plays buffer action.Adopt fet to be because its grid-control voltage scope is wideer than common triode;
3) detection signal output: the resonance potential of comparer A1 anticathode input end and the threshold voltage of electrode input end were relatively judged at zero point, under the normal condition, when resonance current is zero, be lower than threshold voltage, the comparer no-output, when resonance frequency changes, comparer resonance current input terminal voltage raises, greater than threshold voltage, comparer output pulse, this pulse is sent to the digital control circuit of transducer, regulates the width of driving pulse, at corresponding new resonance current zero point, zero detected state is got back in the output of comparer again.
From the architectural feature of the invention described above as can be seen, its advantage is:
1) by a kind of zero current detection circuit of series resonant converter charge power supply is provided, when the non-zero switch appears in transducer, pulse signal of circuit output, this signal is used to regulate the converter switches time, makes converter switches return the resonance current zero passage and carves shutoff.Move when the converter switches in the series resonance charge power supply remains at zero current like this, improved the efficient of power supply;
2) because threshold value is adjustable, also can eliminate the delayed impact that series resonance charge power supply digitial controller is regulated;
The electromagnetic radiation pollution that switch brings when 3) having eliminated because of the circuital current non-zero;
4) saved production cost.
Description of drawings
The present invention will illustrate by way of compared with accompanying drawings and combined with example:
Fig. 1 testing circuit of the present invention and series resonance charge power supply circuit connection diagram;
Fig. 2 Zero Current Switch testing circuit of the present invention theory diagram;
Fig. 3 Zero Current Switch testing circuit of the present invention design circuit;
Fig. 4 circuit input and output of the present invention waveform explanation synoptic diagram;
Fig. 5 comparer input of the present invention, output waveform synoptic diagram.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Principle analysis: in the Pulse Power Techniques field, the high-voltage capacitor that adopts commonly used is made energy storage device, and the general dc constant flowing power of employing high output impedance that requires charges to capacitor.The efficient of common linear-charging power supply is about 60%.In order to realize high-level efficiency, modern high-voltage capacitor charge power supply nearly all adopts the HF switch converter design, and efficient is carried more than 80%.
The HF switch transducer charges to high-voltage energy storage capacitor through behind the transformer with a series of pulses or the pulse train that it forms.But, if the pulse that forms is directly obtained galvanic constantly continuous switch (copped wave) by switch, during switch motion each time, voltage and current on the switch has overlapping phenomenon, forms power attenuation (P=IU), and switching frequency is high more, loss is high more, influences the efficient of power supply.This has also formed current stress and the electromagnetic radiation on the switch.
If the DC current through switch is become alternating current, and DC voltage is constant, make switch action when alternating current is zero, then the power consumption on the switch also is zero.A kind of method is to introduce the LC resonant circuit on switch, during switch connection, resonance produces (ideally, resonant circuit generation free oscillation, become sine wave), switch turn-offs when the resonance current of sine wave drops to zero, has just realized Zero Current Switch (ZCS Zero Current Switching).Another kind is zero voltage switch (ZVSZero Voltage Switching), and principle is similar.Usually, basic LC resonant circuit is divided into series resonance and parallel resonance, because resonance frequency is a fixed value.So the Push And Release of switch also must become fixed value actuation time.
Fig. 1 is the two kinds of Zero Current Switch (ZCS) that insert different resonant circuits in the DC power supply circuit, Fig. 1 (a) is an antiresonant circuit, Fig. 1 (a ') be series resonant circuit, Fig. 1 (b) has provided the voltage U ce of series resonant circuit on switch under the ZCS condition and the waveform of current i c.Wherein Lr is resonant inductance (comprising stray inductance and transformer leakage inductance in the circuit), and Cr is resonant capacitance (junction capacity that comprises switching tube).When switching tube S1 opened, resonant network Lr, Cr connected, circuit resonance, and the electric current in the switching tube changes (actual resonance has damping, is quasi-sine-wave) by sinusoidal rule.When parallel resonance arrives zero, make switching tube turn-off, resonance stops, and is called the ZCS resonant switch.Because resonance impedance very big when desirable (infinity) during series resonance, output meets the feature of constant-current supply, shown in Fig. 1 (b), so extensively be used on the Switching Converter Topologies of the power supply that capacitor fills.Switch took place in sinusoidal wave first cycle, and just the ON time of switch equaled for 1/2 resonance frequency cycle.Switch promptly turn-offs to zero at electric current like this.Obviously the frequency period of switch must be less than cycle of resonance frequency more than 2 times, and circuit working is in the discontinuous current pattern.
Because resonance impedance very big when desirable (infinity) during series resonance, output meets the feature of constant-current supply, so extensively be used on the Switching Converter Topologies of the power supply that capacitor fills.Wherein the resonant inductance of resonant circuit comprises stray inductance and the transformer leakage inductance in the circuit, and resonant capacitance comprises the junction capacity of switching tube.
For the high-voltage capacitor charge power supply, because the no-load voltage ratio of high-tension transformer is very big, its distributed capacitance and leakage inductance are also very big, can exert an influence to resonance frequency when power supply output wide variation, and fix the actuation time of switch, so will produce the non-zero current on-off phenomenon.The present invention is exactly a kind of solution when this phenomenon occurring: in the resonance frequency drift, when the non-zero switch appears in switch, can in time be found, and then change switching time, corresponding drift takes place, and makes switch return to the Zero Current Switch state.
Mentality of designing: The present invention be directed to series resonance charge power supply circuit and have resonance drift, make in the circuit converter switches, design a kind of testing circuit not in the zero current problem of switch constantly.As shown in Figure 2, testing circuit of the present invention is connected with the series resonance charge power supply, detects control.Converter switches is semiconductor devices (IGBT or MOSFET) in the series resonant switched converter type capacitor charging power supply, and L, C constitute series resonant circuit, and T2 is the current detecting mutual inductor in the circuit of the present invention; Series resonant circuit and mutual inductor T2 are connected between transducer and the high-tension transformer.DC voltage is transformed the pulse ac electricity that device, resonant circuit and high-tension transformer are transformed into a high-frequency and high-voltage, gives energy-storage capacitor after rectification.The driving of converter switches, output voltage, size of current are regulated and are finished by numeral or analog controller.Voltage sampling and current sensor are used for the detection of controller to charge power supply output voltage, electric current, and the electric current of transducer is a quasi-sine-wave (being first complete waveform of resonance current).Because this quasi-sine-wave makes converter switches to turn-off when its zero passage.If resonance frequency changes in the power supply, and digitial controller does not detect this variation, in time to making adjustment switching time, the phenomenon that switch turn-offs then occurs when resonance current is non-vanishing.
If can allow digitial controller accurately know change of resonance frequency, in time adjust switching time, can make transducer return to resonance current is zero shutoff.The testing circuit that inserts in the charge power supply circuit among Fig. 2 is based on a comparer, compare by the magnitude of voltage after the switching signal of resonance current voltage signal processed and series resonance charge power supply transducer is handled, the monitoring switch is carved into resonance current zero voltage phase difference constantly when turn-offing, at phase differential greater than zero the time, new resonance current zero passage place output, realization has reached testing goal to the detection of zero current condition.
Fig. 3 detects theory diagram to the charge power supply zero current condition, at first carry out rectification and suitable resonance potential signal of direct current biasing adjusting generation by the resonance current signal that T2 is obtained, simultaneously the converter switches drive signal of taking from the charge power supply digitial controller is carried out rectification and amplitude adjusted processing generation appropriate threshold voltage, with resonance potential signal, switching voltage signal input comparator, make corresponding processing then according to result relatively.The specific design circuit as shown in Figure 4, testing circuit comprises resonance signal rectification circuit, resonance signal dc bias circuit, switching signal rectification circuit, switching signal amplitude regulating circuit.The resonance signal rectification circuit comprises that the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 form full-bridge circuit, and the first diode D1 negative electrode is connected with the second diode D2 anode, and extension line is as the full-bridge circuit input end; The 3rd diode D3 negative electrode is connected with the 4th diode D4 anode, and extension line is as another input end of full-bridge circuit; The first diode D1 anode is connected with the 3rd diode D3 anode, and extension line is as the full-bridge circuit negative pole; The second diode D2 negative electrode is connected with the 4th diode D4 negative electrode, extension line is as the full-bridge circuit positive pole, the resonance signal dc bias circuit comprises the biasing circuit that first resistance (R1), second resistance (R2) and the 3rd resistance (R3) are formed, the switching signal rectification circuit comprises the 5th diode D5, the 6th diode D6, the switching signal amplitude regulating circuit comprises the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), slide rheostat (W1), metal-oxide-semiconductor (T1), electric capacity (C1), the scalable emitter follower circuit of composition.The anodal output of full-bridge circuit inserts comparer (A1) negative pole, the output of full-bridge circuit negative pole is connected with second resistance (R2), the 3rd resistance (R3) link, second resistance (R2) termination is gone into (5V) power supply, an other end is connected with the 3rd resistance (R3), and first resistance (R1) is connected in parallel on the output terminal of full-bridge circuit; The 5th diode D5, the 6th diode D6 forms half-bridge circuit, the half-bridge circuit output terminal is connected with the 5th resistance (R5), the 5th resistance (R5) other end is connected with the grid of metal-oxide-semiconductor (T1), the 6th resistance (R6) connects, the source electrode of metal-oxide-semiconductor (T1) is connected with slide rheostat (W1), slide rheostat (W1) other end is connected with the 4th resistance (R4), the 4th resistance (R4) other end and the 6th resistance (R6) other end, the 3rd resistance (R3) other end, electric capacity (C1) end altogether, electric capacity (C1) other end inserts comparer (A1) positive pole, slide rheostat (W1) inserts the comparer positive pole with the 4th resistance R 4 links (A1), and the drain electrode of metal-oxide-semiconductor (T1) is connected with the 5V power supply; Comparer (A1) output terminal is connected with series resonance charge power supply digitial controller input end b, and the half-bridge circuit input end is connected with series resonance charge power supply digitial controller output terminal a.
1) comparer A1 negative pole input: the mutual inductor T2 elementary by high-tension transformer detects resonance current, after diode D1~D4 rectification, become an appropriate monopolar voltage at resistance R 1 up conversion, and, be connected to the negative pole of comparer A1 by behind divider resistance R2, R3 direct current biasing to the suitable magnitude of voltage;
2) the anodal input of comparer A1: the switching signal (amplitude is no more than 15V usually) of the transducer that obtains by series resonance charge power supply digitial controller, be rectified into unipolar voltage by D5~D6, be connected to the positive pole of comparer A1, this voltage is the threshold voltage of device as a comparison, make comparer before the resonance current zero crossing, export negative pulse just by regulating W1, field effect transistor T1 is the emitter follower of establishing in order to cooperate this adjusting, play buffer action, this is because its grid-control voltage scope is wideer than common triode;
3) output of comparer: the resonance potential of comparer A1 anticathode input end and the switching voltage of electrode input end were relatively judged at zero point.Under the normal condition, when resonance current is zero, be lower than threshold voltage, the comparer no-output.If when resonance frequency uprises, resonance potential raises, and surpasses threshold voltage, comparer output pulse, and vice versa.This pulse is sent to the digital control circuit of transducer, regulates the width of driving pulse, and transducer is got back to the zero-current switching state, and zero detected state is also got back in the output of comparer.
Fig. 5 is comparer input, output waveform synoptic diagram, and when the resonance current frequency becomes big, when non-zero current was closed end, comparer was all the time at signal of zero crossing output.By controller by-pass cock ON time, make constantly corresponding with the resonance current zero passage constantly state of shutoff of converter switches, it is moved in zero detection that is lower than threshold value again the ON time of switch simultaneously.
For example: if adopt the maximum of comparer to be input as 9V, output is ± 5V.The voltage peak and the Dc bias superimposed voltage that enter after the resonance current conversion of comparer are 6V.The output switching signal of controller is 12V, by T1, and W1, R4 becomes 1~6 to it.The inclined to one side threshold voltage of direct current is got 3V, and promptly the zero crossing of electric current is also at 3V, regulates W1 and makes the comparator switch signal end equal 3V, and then comparer will be in resonance current counter-rotating at zero point output, by 0V to-5V.Regulate W1 and make the comparator switch signal end greater than 3V, then comparer will be in the resonance current output of reversing before zero point, by 0V to-5V.
The design adopts resonance current and series resonance charge power supply converter switches signal relatively, can realize corresponding all the time zero moment at new resonance current of output time of comparer.Participate in two signals relatively and all be rectified into the identical polar voltage signal, this becomes the trailing edge of resonance current to realize the input that switch drive can unique acceptance, prevents that the zero crossing of primary current rising edge from also becoming compare threshold.The resonance current signal is biased on the DC level, can conveniently find out zero crossing.Become scalable from the converter switches signal amplitude.The output that makes comparer so just can be before zero current some times, can eliminate the delayed impact that series resonance charge power supply digitial controller is regulated like this.
Disclosed all features in this instructions except mutually exclusive feature, all can make up by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Claims (5)
1. the zero current detection circuit of a series resonance charge power supply comprises comparer A1, it is characterized in that also comprising:
The resonance signal rectification circuit is used for that series resonance capacitor charge power supply resonance current letter (mutual inductor T2 obtains) number is carried out rectification and handles;
The resonance signal dc bias circuit is used for the voltage signal biasing and is set to the circuit required voltage;
The converter switches signal rectifier circuit is used for converter switches signal to series resonant converter formula capacitor charging power supply and carries out rectification and handle, and switching signal is taken from the drive signal of controller (controller can analog or digital) output; Amplitude regulating circuit is used for switching pulse signal is carried out amplitude adjusted, changes comparator threshold voltage;
Resonance signal rectification circuit, resonance signal dc bias circuit, comparer negative input are electrically connected in proper order, and switching signal rectification circuit, switching signal amplitude regulating circuit, comparer electrode input end are electrically connected in proper order.
2. the zero current detection circuit of a kind of series resonance charge power supply according to claim 1, it is characterized in that described resonance signal rectification circuit comprises that the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 form full-bridge circuit, the first diode D1 negative electrode is connected with the second diode D2 anode, and extension line is as the full-bridge circuit input end; The 3rd diode D3 negative electrode is connected with the 4th diode D4 anode, and extension line is as another input end of full-bridge circuit; The first diode D1 anode is connected with the 3rd diode D3 anode, and extension line is as the full-bridge circuit negative pole; The second diode D2 negative electrode is connected with the 4th diode D4 negative electrode, extension line is as the full-bridge circuit positive pole, described resonance signal dc bias circuit comprises the biasing circuit that first resistance (R1), second resistance (R2) and the 3rd resistance (R3) are formed, described switching signal rectification circuit comprises the 5th diode D5, the 6th diode D6, described switching signal amplitude regulating circuit comprises the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), slide rheostat (W1), metal-oxide-semiconductor (T1), electric capacity (C1), the scalable emitter follower circuit of composition.The anodal output of full-bridge circuit inserts comparer (A1) negative pole, the output of full-bridge circuit negative pole is connected with second resistance (R2), the 3rd resistance (R3) link, second resistance (R2) termination is gone into (5V) power supply, an other end is connected with the 3rd resistance (R3), and first resistance (R1) is connected in parallel on the output terminal of full-bridge circuit; The 5th diode D5, the 6th diode D6 forms half-bridge circuit, the half-bridge circuit output terminal is connected with the 5th resistance (R5), the 5th resistance (R5) other end is connected with the grid of metal-oxide-semiconductor (T1), the 6th resistance (R6) connects, the source electrode of metal-oxide-semiconductor (T1) is connected with slide rheostat (W1), slide rheostat (W1) other end is connected with the 4th resistance (R4), the 4th resistance (R4) other end and the 6th resistance (R6) other end, the 3rd resistance (R3) other end, electric capacity (C1) end altogether, electric capacity (C1) other end inserts comparer (A1) positive pole, slide rheostat (W1) inserts the comparer positive pole with the 4th resistance R 4 links (A1), and the drain electrode of metal-oxide-semiconductor (T1) is connected with the 5V power supply; Comparer (A1) output terminal is connected with series resonance charge power supply digitial controller input end b, and the half-bridge circuit input end is connected with series resonance charge power supply digitial controller output terminal a.
3. the zero current detection circuit of a kind of series resonance charge power supply according to claim 1 is characterized in that described testing circuit is electrically connected with the series resonance charge power supply.
4. the zero current detection circuit design method of a series resonance charge power supply, it is characterized in that at first regulating suitable resonance potential signal of generation by the resonance current signal being carried out rectification and direct current biasing, switching drive signal to series resonance charge power supply digitial controller carries out rectification and amplitude adjusted processing generation appropriate threshold voltage simultaneously, with resonance potential signal, threshold voltage signal input comparator, make corresponding processing then according to result relatively.
5. the zero current detection circuit design method of a kind of series resonance charge power supply according to claim 4 is characterized in that described testing circuit design procedure comprises:
1) resonance current Signal Processing: the mutual inductor T2 elementary by high-tension transformer detects resonance current, after diode D1~D4 rectification, become an appropriate monopolar voltage at resistance (R1) up conversion, and, be connected with comparer (A1) negative pole by behind divider resistance (R2), resistance (R3) direct current biasing to the suitable magnitude of voltage;
2) switching signal of series resonance charge power supply transducer obtains and handles: the switching drive signal amplitude of taking from the output of series resonance charge power supply digitial controller is fixed, be rectified into unipolar voltage by D5~D6, be connected to the positive pole of comparer (A1), this voltage is the threshold voltage of device as a comparison, can make comparer export negative voltage just before the resonance current zero crossing by regulating (W1);
3) detection signal output: the resonance potential of comparer (A1) anticathode input end and the threshold voltage of electrode input end were relatively judged at zero point, under the normal condition, when resonance current is zero, threshold voltage is higher than zero point, the comparer no-output, when resonance frequency changes, current zero moves, be that last current zero magnitude of voltage constantly increases, greater than threshold voltage, comparer output negative voltage, this voltage negative edge can be spent the digital control circuit that triggers transducer, regulate the width of driving pulse, make the corresponding new resonance current zero point of shutoff of switch, zero detected state is got back in the output of comparer again.
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CN113708604B (en) * | 2020-05-20 | 2023-01-31 | 立锜科技股份有限公司 | Resonant switching power converter |
CN113394981A (en) * | 2020-06-10 | 2021-09-14 | 成都芯源系统有限公司 | Resonant converter with automatic frequency adjustment and control method thereof |
CN113394981B (en) * | 2020-06-10 | 2022-09-06 | 成都芯源系统有限公司 | Resonant converter with automatic frequency adjustment and control method thereof |
CN111987695A (en) * | 2020-07-27 | 2020-11-24 | 株洲麦格米特电气有限责任公司 | Resonant converter, over-current protection method of resonant converter and electronic equipment |
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CN114421780A (en) * | 2022-03-11 | 2022-04-29 | 深圳市首航新能源股份有限公司 | Resonant converter and control method |
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