CN101667783A - Synchronous rectification drive device and method for converter - Google Patents
Synchronous rectification drive device and method for converter Download PDFInfo
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Abstract
The invention discloses synchronous rectification drive device and method for a converter. The device comprises a current transformer detecting module, a latch and an AND gate, wherein the current transformer detecting module is coupled between the latch and a synchronous rectification tube of the converter; the output of the latch is coupled to the input of the AND gate, and the input of the ANDgate is also coupled with a control signal of a primary side power tube of the converter; the current transformer detecting module detects current in the synchronous rectification tube and generates an ascending signal when the current flows backwards, and the ascending signal is output to the latch; after receiving the ascending signal, the latch outputs a latch signal to the AND gate; and the AND gate carries out an AND operation on the latch signal and the control signal of the primary side power tube so as to generate a driving control signal which is output to the synchronous rectification tube. The invention detects and locks a signal of the current attempted to flow backwards of a rectification branch of the converter and shuts off the synchronous rectification tube by utilizing thesignal so as to avoid reverse current phenomenon and guarantee the normal operation of a circuit.
Description
Technical field
The present invention relates to a kind of synchronous rectification drive device that is used for converter, the invention still further relates to a kind of synchronous commutation driving method that is used for converter.
Background technology
High efficiency is an important development trend of transformation of electrical energy device, synchronous rectification is a kind of method that the low-voltage, high-current occasion is raised the efficiency common employing, its basic principle is to adopt the MOSFET of low on-resistance to substitute rectifier diode, to reduce the conduction loss of rectification circuit.
In the LLC controlled resonant converter, when operating frequency was not less than resonance frequency, secondary rectifying tube conducting pulsewidth was about half of switch periods, and this moment, its drive signal can be consistent with the corresponding power tube in former limit; And in operating frequency during less than resonance frequency, secondary rectifying tube conducting pulsewidth is about half of harmonic period, and less than the conducting pulsewidth of the corresponding power tube in former limit, promptly having electric current in the rectifying tube is zero Dead Time section.Therefore, in LLC resonant transformation topology circuit of synchronous rectification, when operating frequency is lower than resonance frequency, the drive signal of secondary synchronous rectifier can not be directly obtained by the control signal of former limit power tube, otherwise can cause synchronous rectifier conducting pulsewidth excessive, produce phenomenons such as the anti-filling of electric current, have a strong impact on the operate as normal of circuit.Suitable synchronous rectifier driving pulse production method is the key that the LLC controlled resonant converter is realized synchronous rectification.
Summary of the invention
Technical problem to be solved by this invention is exactly in order to overcome above deficiency, to have proposed a kind of synchronous rectification drive device that is used for converter and method that can make the converter operate as normal.
Technical problem of the present invention is solved by following technical scheme:
A kind of synchronous rectification drive device that is used for converter, comprise current transformer detection module, latch and with door, described current transformer detection module is coupling between the synchronous rectifier of latch and converter, described latch output is coupled to and the door input, and described and door input also is coupled with the control signal of the former limit power tube of converter; Described current transformer detection module detects the electric current in the synchronous rectifier, and the electric current in synchronous rectifier is counter produces the rising edge signal when irritating and export latch to, latch receive behind the described rising edge signal output latch signal to door, describedly carry out exporting synchronous rectifier to computing generation drive control signal with the goalkeeper's latch signal and the control signal of former limit power tube.
Described current transformer detection module comprises current transformer, the 3rd diode, the 4th diode; Described current transformer former limit winding and synchronous rectifier coupling, described current transformer secondary first winding be connected across in the load of converter after the 3rd diode links to each other, described the 4th diode is connected across on current transformer secondary second winding, and the 4th diode cathode is connected to the latch input.
Described current transformer detection module comprises current transformer, the 3rd diode, first resistance, the 4th diode; Described current transformer former limit winding and synchronous rectifier coupling, described current transformer secondary first winding be connected across in the load of converter after the 3rd diode links to each other, described first resistance be connected across on current transformer secondary second winding after the 4th diode links to each other, the mid point of first resistance and the 4th diode is connected to the latch input.
Described current transformer detection module comprises current transformer, the 3rd diode, at least one n1 diode, the 4th diode; Described current transformer former limit winding and synchronous rectifier coupling, described current transformer secondary first winding be connected across in the load of converter after the 3rd diode links to each other, linking to each other with described the 4th diode after all n1 diodes link to each other is connected across on current transformer secondary second winding more again, and the tie point of the 4th diode and n1 diode is coupled to the latch input.
Described current transformer detection module comprises current transformer, the 7th diode, second resistance, first resistance, the 4th diode, comparator; Described current transformer former limit winding and synchronous rectifier coupling, described the 7th diode be connected across on the current transformer secondary winding after second resistance links to each other, be used to make current transformer to reset, described the 4th diode be connected across on the current transformer secondary winding after first resistance links to each other, the tie point of first resistance and the 4th diode is coupled to the comparator first input end, comparator second input is connected to reference signal, and comparator output terminal is coupled to the latch input.
Described latch input also is coupled with the control signal of former limit power tube, and the control signal of described former limit power tube is used for latch is resetted.
Described converter comprises first synchronous rectifier and second synchronous rectifier, described current transformer detection module comprises the first current transformer detection module and the second current transformer detection module, described latch comprises first latch and second latch, described with the door comprise first with the door and second and; The described first current transformer detection module is coupling between first synchronous rectifier of first latch and converter, the output of described first latch be coupled to first with the door input, described first also is coupled with the control signal of the first former limit power tube of converter with the door input; The described first current transformer detection module detects the electric current in first synchronous rectifier, and the electric current in first synchronous rectifier is counter produces the first rising edge signal when irritating and export first latch to, first latch receives output first latch signal to the first and door behind the described first rising edge signal, and described first carries out computing with the control signal of goalkeeper's first latch signal and the first former limit power tube produces first drive control signal and export first synchronous rectifier to; The described second current transformer detection module is coupling between second synchronous rectifier of second latch and converter, the output of described second latch be coupled to second with the door input, described second also is coupled with the control signal of the second former limit power tube of converter with the door input; The described second current transformer detection module detects the electric current in second synchronous rectifier, and the electric current in second synchronous rectifier is counter produces the second rising edge signal when irritating and export second latch to, second latch receives output second latch signal to the second and door behind the described rising edge signal, and described second carries out computing with the control signal of goalkeeper's second latch signal and the second former limit power tube produces second drive control signal and export second synchronous rectifier to.
Described converter is full-bridge LLC controlled resonant converter or half-bridge logical link control (LLC) resonant converter or works in anti exciting converter under the discontinuous conduction mode.
A kind of synchronous commutation driving method that is used for converter, comprise the steps: to adopt the synchronous rectification tube current of current transformer and latch detection and locking converter to attempt anti-signal of irritating, the control signal of described signal and former limit power tube is done and computing, obtained the drive control signal of synchronous rectifier.
Described converter is full-bridge LLC controlled resonant converter or half-bridge logical link control (LLC) resonant converter or works in anti exciting converter under the discontinuous conduction mode.
The beneficial effect that the present invention is compared with the prior art is: the present invention detects and locking converter rectification branch current is attempted anti-signal of irritating, and utilizes this signal that synchronous rectifier is turn-offed, thereby avoids the anti-generation of irritating phenomenon of electric current.Guarantee the operate as normal of circuit.Circuit structure of the present invention is simple, cost is low.
Description of drawings
Fig. 1 is the structural representation of the specific embodiment of the invention one;
Fig. 2 is the feature work waveform schematic diagram of the specific embodiment of the invention one;
Fig. 3 is the structural representation of the specific embodiment of the invention two;
Fig. 4 is the structural representation of the specific embodiment of the invention three.
Embodiment
Also in conjunction with the accompanying drawings the present invention is described in further details below by concrete execution mode.
Embodiment one
As shown in Figure 1, a kind of LLC controlled resonant converter comprises the first synchronous rectifier SR1, the second synchronous rectifier SR2, the first former limit power tube Q1, the second former limit power tube Q2, controller etc.The synchronous rectification drive device that is used for converter of the specific embodiment of the invention one comprise the first current transformer detection module, the second current transformer detection module, the first latch Q3, the second latch Q4, first and door AND1 and second with an AND2.
The described first current transformer detection module is coupling between the first synchronous rectifier SR1 and the first latch Q3, described first latch Q3 output be coupled to first with door AND1 input, described first also is coupled with the control signal of the first former limit power tube Q1 with door AND1 input.
The described first current transformer detection module detects the electric current among the first synchronous rectifier SR1, and produce the first rising edge signal during anti-filling of electric current in the first synchronous rectifier SR1 and export the first latch Q3 to, the first latch Q3 receives output first a latch signal Vp1 to the first and a door AND1 behind the described first rising edge signal, and described first carries out the first control signal Vg1 of the first latch signal Vp1 and the first former limit power tube Q1 to produce the control end that the first drive control signal Vr1 exports the first synchronous rectifier SR1 to computing with door AND1.
The described second current transformer detection module is coupling between the second synchronous rectifier SR2 and the second latch Q4, described second latch Q4 output be coupled to second with door AND2 input, described second also is coupled with the second control signal Vg2 of the second former limit power tube Q2 with door AND2 input.The described second current transformer detection module detects the electric current among the second synchronous rectifier SR2, and produce the second rising edge signal during anti-filling of electric current in the second synchronous rectifier SR2 and export the second latch Q4 to, the second latch Q4 receives output second a latch signal Vp2 to the second and a door AND2 behind the described second rising edge signal, and described second carries out the second control signal Vg2 of the second latch signal Vp2 and the second former limit power tube Q2 to produce the control end that the second drive control signal Vr2 exports the second synchronous rectifier SR2 to computing with door AND2.
The described first current transformer detection module comprises the first current transformer CT1, the 3rd diode D3, first resistance R 1, the 4th diode D4; Described first current transformer CT1 former limit winding and first synchronous rectifier SR1 coupling, the described first current transformer CT1 secondary, first winding be connected across on the load RL of converter after the 3rd diode D3 links to each other, described first resistance R 1 be connected across on the first current transformer CT1 secondary, second winding after the 4th diode D4 links to each other, the tie point of first resistance R 1 and the 4th diode D4 is connected to the first latch Q3 input.
The described second current transformer detection module comprises the second current transformer CT2, the 5th diode D5, the 3rd resistance R 3, the 6th diode D6; Described second current transformer CT2 former limit winding and second synchronous rectifier SR2 coupling, the described second current transformer CT2 secondary, first winding be connected across on the load RL of converter after the 5th diode D5 links to each other, described the 3rd resistance R 3 be connected across on the second current transformer CT2 secondary, second winding after the 6th diode D6 links to each other, the tie point of the 3rd resistance R 3 and the 6th diode D6 is connected to the second latch Q4 input.
As shown in Figure 2, the operation principle of the above-mentioned synchronous rectification drive device that is used for converter is as follows: adopt the first current transformer CT1 to detect the electric current of the first synchronous rectifier SR1.When the electric current among the first synchronous rectifier SR1 when source electrode flows to drain electrode, the 3rd diode D3 ends, and the first current transformer CT1 secondary current flows through the 4th diode D4 and first resistance R 1 is carried out magnetic reset, and Vs1 is low level signal-Vd, wherein, Vd is the tube voltage drop of diode.When the electric current among synchronous rectifier SR1 when electric current is counter irritates (occur) when drain electrode flows to source electrode, the 3rd diode D3 conducting, in the output voltage of converter, the first current transformer CT1 secondary, second winding, 2 output voltages are Vo with the first current transformer CT1 secondary, first winding, 1 voltage clamp
*M2/m1, wherein Vo is the output voltage of converter, and m1 is the number of turn of the first current transformer CT1 secondary, first winding 1, and m2 is the number of turn of the first current transformer CT1 secondary, second winding 2.The first current transformer detection module produces the first rising edge signal and sends into the first latch Q3 (along triggering latch) at this moment, the first latch Q3 receives output first a latch signal Vp1 to the first and a door AND1 behind the described first rising edge signal, described first with door AND1 the first control signal Vg1 of the first latch signal Vp1 and the first former limit power tube Q1 is carried out and (and) computing produce the control end that the first drive control signal Vr1 exports the first synchronous rectifier SR1 to.
First drive control signal of the generation principle of second drive control signal of the second synchronous rectifier SR2 and the first synchronous rectifier SR1 is similar, repeats no more herein.
This embodiment also adopts the control signal of former limit power tube that latch is resetted.For example: when the latch high level resets, adopt the first former limit power tube control signal Vg1 that latch is resetted; When the latch low level resets, adopt the second former limit power tube control signal Vg2 that latch is resetted.
In Fig. 1, the former limit of first current transformer CT1 winding also can be placed on the first synchronous rectifier right side.Described the 3rd diode D3 can be placed on the lower end of the first current transformer CT1 secondary, first winding, but this moment, the 3rd diode D3 negative electrode linked to each other with the first current transformer CT1 secondary, first winding, and anode links to each other with the load RL of converter, to guarantee current direction.Described the 4th diode D4 can be placed on the upper end of the first current transformer CT1 secondary, second winding, but this moment, the 4th diode D4 negative electrode linked to each other with the first current transformer CT1 secondary, second winding, and anode links to each other with first resistance R 1, to guarantee current direction.Also can make similar distortion to the second current transformer detection module, repeat no more herein.
This embodiment comprises that with converter two synchronous rectifiers are that example describes.If converter only comprises a synchronous rectifier, then current transformer detection module, latch, also only need one with door, circuit structure is identical.
The present invention detects and locking converter rectification branch current is attempted anti-signal of irritating, and utilizes this signal that synchronous rectifier is turn-offed, thereby avoids the anti-generation of irritating phenomenon of electric current.
Embodiment two
As shown in Figure 3, the difference of this embodiment and embodiment one is: replace first resistance R 1 and the 3rd resistance R 3 among Fig. 1 respectively with n diode in series (n is an integer, n 〉=0) n1 diode Dn1 shown in the empty frame and n2 diode Dn2 among Fig. 3.This embodiment can the transformer induced energy loss size of Control current.And the number of n1 diode Dn1 can be different with the number of n2 diode Dn2.
When n 〉=1, as shown in Figure 3, in this embodiment, the described first current transformer detection module comprises the first current transformer CT1, the 3rd diode D3, at least one n1 diode Dn1, the 4th diode D4; Described first current transformer CT1 former limit winding and first synchronous rectifier SR1 coupling, the described first current transformer CT1 secondary, first winding be connected across on the load RL of converter after the 3rd diode D3 links to each other, described the 4th diode D4 be connected across on the first current transformer CT1 secondary, second winding after all n1 diode Dn1 link to each other, the tie point of n1 diode Dn1 and the 4th diode D4 is connected to the first latch Q3 input.The described second current transformer detection module comprises the second current transformer CT2, the 5th diode D5, at least one n2 diode Dn2, the 6th diode D6; Described second current transformer CT2 former limit winding and second synchronous rectifier SR2 coupling, the described second current transformer CT2 secondary, first winding be connected across on the load RL of converter after the 5th diode D5 links to each other, described the 6th diode D6 be connected across on the second current transformer CT2 secondary, second winding after all n2 diode Dn2 link to each other, the tie point of n2 diode Dn2 and the 6th diode D6 is connected to the second latch Q4 input.
When n=0, as shown in Figure 3, in this embodiment, the described first current transformer detection module comprises the first current transformer CT1, the 3rd diode D3, the 4th diode D4; Described first current transformer CT1 former limit winding and first synchronous rectifier SR1 coupling, the described first current transformer CT1 secondary, first winding be connected across on the load RL of converter after the 3rd diode D3 links to each other, described the 4th diode D4 is connected across on the first current transformer CT1 secondary, second winding, and the negative electrode of the 4th diode D4 is connected to the first latch Q3 input.The described second current transformer detection module comprises the second current transformer CT2, the 5th diode D5, the 6th diode D6; Described second current transformer CT2 former limit winding and second synchronous rectifier SR2 coupling, the described second current transformer CT2 secondary, first winding be connected across on the load RL of converter after the 5th diode D5 links to each other, described the 6th diode D6 is connected across on the second current transformer CT2 secondary, second winding, and the negative electrode of the 6th diode D6 is connected to the second latch Q4 input.
Embodiment three
As shown in Figure 4, this embodiment is with the difference of embodiment one: saved the first current transformer secondary, first winding, the second current transformer secondary, second winding, and be provided with the current transformer reset circuit in addition.
As shown in Figure 4, in this embodiment, the described first current transformer detection module comprises the first current transformer CT1, the 7th diode D7, second resistance R 2, first resistance R 1, the 4th diode D4, the first comparator C MP1; Described first current transformer CT1 former limit winding and first synchronous rectifier SR1 coupling, the 7th diode D7 be connected across on the first current transformer CT1 secondary winding after second resistance R 2 links to each other, be used to make the first current transformer CT1 to reset, described the 4th diode D4 be connected across on the first current transformer CT1 secondary winding after first resistance R 1 links to each other, the tie point of first resistance R 1 and the 4th diode D4 be coupled to the first comparator first input end+, first comparator, second input-be connected to reference signal Vref, first comparator output terminal is coupled to first latch Q3 input.
As shown in Figure 4, in this embodiment, the described second current transformer detection module comprises the second current transformer CT2, the 8th diode D8, the 4th resistance R 4, the 3rd resistance R 3, the 6th diode D6, the second comparator C MP2; Described second current transformer CT2 former limit winding and second synchronous rectifier SR2 coupling, the 8th diode D8 be connected across on the second current transformer CT2 secondary winding after the 4th resistance R 4 links to each other, be used to make the second current transformer CT2 to reset, described the 6th diode D6 be connected across on the second current transformer CT2 secondary winding after the 3rd resistance R 3 links to each other, the tie point of the 6th diode D6 and the 3rd resistance R 3 be coupled to the second comparator C MP2 first input end+, the second comparator C MP2, second input-be connected to reference signal Vref, second comparator output terminal is coupled to second latch Q4 input.
The operation principle of this embodiment is summarized as follows: when the electric current of the first synchronous rectifier SR1 when source electrode flows to drain electrode, the electric current of the first current transformer CT1 secondary detects output low level signal-Vd through the 4th diode D4 and first resistance R 1.When the first synchronous rectifier SR1 electric current when drain electrode flows to source electrode, the first current transformer CT1 secondary current is through the 7th diode D7 and second resistance R 2, detect the output high level signal, through obtaining the first rising edge signal after the first comparator C MP1 shaping, send into the first latch D1 again.The first latch Q3 receives output first a latch signal Vp1 to the first and a door AND1 behind the described first rising edge signal, described first with door AND1 the first control signal Vg1 of the first latch signal Vp1 and the first former limit power tube Q1 is carried out and (and) computing produce the control end that the first drive control signal Vr1 exports the first synchronous rectifier SR1 to.First drive control signal of the generation principle of second drive control signal of the second synchronous rectifier SR2 and the first synchronous rectifier SR1 is similar, repeats no more herein.
The present invention can be applicable to all converters, but at full-bridge LLC controlled resonant converter or half-bridge logical link control (LLC) resonant converter or work in discontinuous conduction mode (Discontinuous Current Mode, DCM) the anti exciting converter effect under is better.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. synchronous rectification drive device that is used for converter, it is characterized in that: comprise current transformer detection module, latch and with door, described current transformer detection module is coupling between the synchronous rectifier of latch and converter, described latch output is coupled to and the door input, and described and door input also is coupled with the control signal of the former limit power tube of converter; Described current transformer detection module detects the electric current in the synchronous rectifier, and the electric current in synchronous rectifier is counter produces the rising edge signal when irritating and export latch to, latch receive behind the described rising edge signal output latch signal to door, describedly carry out exporting synchronous rectifier to computing generation drive control signal with the goalkeeper's latch signal and the control signal of former limit power tube.
2. the synchronous rectification drive device that is used for converter according to claim 1 is characterized in that: described current transformer detection module comprises current transformer, the 3rd diode, the 4th diode; Described current transformer former limit winding and synchronous rectifier coupling, described current transformer secondary first winding be connected across in the load of converter after the 3rd diode links to each other, described the 4th diode is connected across on current transformer secondary second winding, and the 4th diode cathode is connected to the latch input.
3. the synchronous rectification drive device that is used for converter according to claim 1 is characterized in that: described current transformer detection module comprises current transformer, the 3rd diode, first resistance, the 4th diode; Described current transformer former limit winding and synchronous rectifier coupling, described current transformer secondary first winding be connected across in the load of converter after the 3rd diode links to each other, described first resistance be connected across on current transformer secondary second winding after the 4th diode links to each other, the mid point of first resistance and the 4th diode is connected to the latch input.
4. the synchronous rectification drive device that is used for converter according to claim 1 is characterized in that: described current transformer detection module comprises current transformer, the 3rd diode, at least one n1 diode, the 4th diode; Described current transformer former limit winding and synchronous rectifier coupling, described current transformer secondary first winding be connected across in the load of converter after the 3rd diode links to each other, linking to each other with described the 4th diode after all n1 diodes link to each other is connected across on current transformer secondary second winding more again, and the tie point of the 4th diode and n1 diode is coupled to the latch input.
5. the synchronous rectification drive device that is used for converter according to claim 1 is characterized in that: described current transformer detection module comprises current transformer, the 7th diode, second resistance, first resistance, the 4th diode, comparator; Described current transformer former limit winding and synchronous rectifier coupling, described the 7th diode be connected across on the current transformer secondary winding after second resistance links to each other, be used to make current transformer to reset, described the 4th diode be connected across on the current transformer secondary winding after first resistance links to each other, the tie point of first resistance and the 4th diode is coupled to the comparator first input end, comparator second input is connected to reference signal, and comparator output terminal is coupled to the latch input.
6. according to the arbitrary described synchronous rectification drive device that is used for converter of claim 1-5, it is characterized in that: described latch input also is coupled with the control signal of former limit power tube, and the control signal of described former limit power tube is used for latch is resetted.
7. according to the arbitrary described synchronous rectification drive device that is used for converter of claim 1-5, it is characterized in that:
Described converter comprises first synchronous rectifier and second synchronous rectifier, described current transformer detection module comprises the first current transformer detection module and the second current transformer detection module, described latch comprises first latch and second latch, described with the door comprise first with the door and second and;
The described first current transformer detection module is coupling between first synchronous rectifier of first latch and converter, the output of described first latch be coupled to first with the door input, described first also is coupled with the control signal of the first former limit power tube of converter with the door input; The described first current transformer detection module detects the electric current in first synchronous rectifier, and the electric current in first synchronous rectifier is counter produces the first rising edge signal when irritating and export first latch to, first latch receives output first latch signal to the first and door behind the described first rising edge signal, and described first carries out computing with the control signal of goalkeeper's first latch signal and the first former limit power tube produces first drive control signal and export first synchronous rectifier to;
The described second current transformer detection module is coupling between second synchronous rectifier of second latch and converter, the output of described second latch be coupled to second with the door input, described second also is coupled with the control signal of the second former limit power tube of converter with the door input; The described second current transformer detection module detects the electric current in second synchronous rectifier, and the electric current in second synchronous rectifier is counter produces the second rising edge signal when irritating and export second latch to, second latch receives output second latch signal to the second and door behind the described rising edge signal, and described second carries out computing with the control signal of goalkeeper's second latch signal and the second former limit power tube produces second drive control signal and export second synchronous rectifier to.
8. according to the arbitrary described synchronous rectification drive device that is used for converter of claim 1-5, it is characterized in that: described converter is full-bridge LLC controlled resonant converter or half-bridge logical link control (LLC) resonant converter or works in anti exciting converter under the discontinuous conduction mode.
9. synchronous commutation driving method that is used for converter, it is characterized in that: comprise the steps: to adopt the synchronous rectification tube current of current transformer and latch detection and locking converter to attempt anti-signal of irritating, the control signal of described signal and former limit power tube is done and computing, obtained the drive control signal of synchronous rectifier.
10. the synchronous commutation driving method that is used for converter according to claim 9 is characterized in that: described converter is full-bridge LLC controlled resonant converter or half-bridge logical link control (LLC) resonant converter or works in anti exciting converter under the discontinuous conduction mode.
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