CN102497104B - Resonant transformation circuit applied to medical equipment and provided with synchronous rectification control - Google Patents
Resonant transformation circuit applied to medical equipment and provided with synchronous rectification control Download PDFInfo
- Publication number
- CN102497104B CN102497104B CN201110387403.2A CN201110387403A CN102497104B CN 102497104 B CN102497104 B CN 102497104B CN 201110387403 A CN201110387403 A CN 201110387403A CN 102497104 B CN102497104 B CN 102497104B
- Authority
- CN
- China
- Prior art keywords
- circuit
- synchronous rectification
- secondary side
- current
- switch pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Rectifiers (AREA)
Abstract
The invention belongs to a circuit system applied to signal controlling and processing of medical equipment and particularly relates to a resonant transformation circuit applied to medical equipment and provided with synchronous rectification control. The technical scheme provided by the resonant transformation circuit does not need a delay circuit, body diode voltage of a synchronous rectifier tube is not detected, and voltage signals are obtained directly after current in a secondary side winding is converted into low current through a current transformer, thereby reducing opening time of a body diode of the secondary side rectifier tube as much as possible, and further improving efficiency. Simultaneously, a current directly-driving method in the secondary side winding is adopted, thereby avoiding alternating conduction of an upper tube and a lower tube, and enhancing reliability of circuits in the medical equipment. In addition, the resonant transformation circuit does not need additional control circuits or zero passage detection, only needs the current transformer to convert the current into the low current so as to conveniently form driving voltage to drive a winding reset circuit of the current transformer, and is simple in circuit and low in cost.
Description
Technical field
It is particularly a kind of that there is the resonant transform circuit that synchronous rectification is controlled applied to Medical Devices the invention belongs to a kind of circuit system of signal control and processing applied to Medical Devices.
Background technology
The development trend of Switching Power Supply is miniaturization, lightweight, that is, means high efficiency and high power density, while it is also proposed higher requirement to Electro Magnetic Compatibility.For high power density, the number of turn of each winding of transformer can be reduced by improving working frequency and reduce core dimensions, so that transformer is minimized, therefore Switching Power Supply miniaturization, lightweight most direct way are circuit high frequencies.But while switching frequency is improved, switching loss increases therewith, and circuit efficiency declines seriously, and electromagnetic interference also increases, so it is not all right simply to improve switching frequency.For these problems, soft switch technique is occurred in that, it makes the switching tube inside power supply be operated in no-voltage conducting state using resonance principle, reduces switching loss and switching noise, improve efficiency and reduce electromagnetic interference, increase substantially switching frequency.
The principle that controlled resonant converter is realized as Sofe Switch is briefly described below, up and down switching tube alternate conduction, its dutycycle each 50%, between have a Dead Time, in order to prevent being turned on while upper down tube, this Dead Time can be adjusted, it is ensured that upper down tube will not be simultaneously turned on.Converter can be operated in following frequency range：
1. 
；
2. 
；
3. 
(subregion)；
Wherein,For switching frequency,
Two characteristic resonant frequencies：
Here only with
Exemplified by illustrate the course of work of resonant half-bridge converter.As shown in Fig. 1 waveforms, t0~t4 is a complete work period：During t0~t1, as shown in Fig. 2 half-bridge power switch pipe S1, S2 are turned off, the resonance circuit that resonant inductance Ls, series resonant capacitance Cs are constituted makes S1 realize that no-voltage is open-minded；During t1~t2, half-bridge circuit power switch tube S 1 is turned on, and has a bit of time before wherein t2, and series resonance inductor Ls, series resonant capacitance Cs and transformer inductance Lm constitute resonance circuit, and now the electric current of secondary side rectifier switch pipe is 0；During t2~t3, the power switch tube S 1 of resonance circuit, S2 shut-offs, series resonance inductor Ls, resonant capacitance Cs constitute resonance circuit, S2 is realized that 0 voltage is open-minded；During t3~t4, resonance circuit power switch tube S 2 is turned on, and has a bit of time before t4, and the electric current that resonant inductance Ls, Cs and Lm constitute on resonance circuit, secondary side rectifier switch pipe is also 0.
For optimized design resonance circuit, nominal input voltage is typically all set to be fully loaded with output condition, converter is operated in slightly larger than resonant frequency fm points, is so entered in load change or Voltage Drop
Region.
Relevant prior art, is referred to shown in Fig. 2, and the series resonant converter shown in the figure uses semibridge system structure.It includes one by the more than one pair of power switch S1 and S2 half-bridge circuits constituted and a resonant network, and the resonant network is made up of a resonant inductance Ls, a resonant capacitance Cs and transformer magnetizing inductance Lm.Series resonance inductor Ls can be that the leakage inductance of transformer can also be independent inductance.This three resonant parameters constitute two characteristic resonant frequencies fs and fm of resonant network：
Secondary side is the current rectifying and wave filtering circuit being made up of transformer assists winding Ns1 and Ns2 and Q1, Q2 and output capacitance, and the power switch pipe Q1 and Q2 that circuit of synchronous rectification is connected to output capacitance Co by one pair of which are constituted.
The input of the controlled resonant converter is a DC voltage Vin, and its transformer in a first side winding and two by, with the secondary side winding Ns1 and Ns2 that are in series, half-bridge circuit and resonant network being isolated with circuit of synchronous rectification.
Key is in synchronous commutating control circuit, in the prior art, there is the control of one kind special integrated circuit to see Fig. 2, its implementation is, detect synchronous rectifier Q1, Q2 drain-source voltage size and rising or trailing edge, to determine the Q1 and Q2 height for driving voltage and the service time of control synchronous rectifier, essence is that the body diode for wanting switching tube is turned on, detect the voltage above it, control chip can send two signal drivings with a control chip, can also provide a signal with two and drive respectively.
Due to Switching Power Supply high-frequency switching characteristic, shut-off noise is likely to result in the false triggering of switching tube（It is switched on or off by mistake）, so many control chips add delay circuit and debounce function, it is ensured that minimum ON time, still, under low-voltage, high-current loading condition, efficiency improves limited；So cause synchronous rectifier loss unnecessary under small load condition simultaneously, namely it is inefficient when underloading.There is a kind of current over-zero detection control drive circuit in the prior art, as shown in Figure 3, secondary side controller controls the break-make of secondary side circuit of synchronous rectification by the zero passage detection to secondary side winding electric current, so that secondary side circuit of synchronous rectification is turned on during whole sinusoidal half-wave current, the shut-off of remaining time.Its core is equal to the LLC synchronous rectification control chip thoughts of current main flow producer.Due to there is the process of current detecting, therefore always there is certain delay between output control signal, this will all cause the conducting of the body diode of body synchronous rectification switch pipe, the raising of efficiency will all be had influence on, particularly in the case of low-voltage, high-current, improved efficiency also Existential Space, especially in field of medical device, the lifting of efficiency is even more to be particularly important.
The content of the invention
To overcome drawbacks described above, it is a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices that the purpose of the present invention, which is,.
The purpose of the present invention is achieved through the following technical solutions：
The present invention is a kind of to have the resonant transform circuit that synchronous rectification is controlled applied to Medical Devices, mainly includes：
Bridge-type resonance circuit and connected secondary side circuit, described secondary side circuit includes secondary side winding and the circuit of synchronous rectification being connected with each other, it is characterized in that, described secondary side circuit also includes, be connected with the secondary side winding be used for by high current be converted into the current transformer of low current signal and be connected between the current transformer and circuit of synchronous rectification be used for by current signal be converted into voltage signal and drive the circuit of synchronous rectification electric current change potential circuit.
Further, described current transformer includes main winding and sensing winding, one end of described main winding is connected with described secondary side winding, the other end is connected with the output par, c of the secondary side circuit, described sensing winding one end is connected with described electric current conversion potential circuit, and the other end is connected to ground.
Further, described circuit of synchronous rectification includes synchronous rectification switch pipe, and described electric current conversion potential circuit is connected with the grid of described synchronous rectification switch pipe.
Further, described secondary side winding quantity be two and its more than, current transformer described in described each secondary side winding correspondence one and the electric current conversion potential circuit described in one, the number of the corresponding described synchronous rectification switch pipe of each described secondary side winding for one and its more than, if more than one synchronous rectification switch pipe, then be connected in parallel with each other.
Further, described secondary side circuit also includes an output filter circuit, and described output filter circuit is connected with the output par, c of the secondary side circuit, including output capacitance, for being filtered to the voltage after the circuit of synchronous rectification rectification, the direct current output for being stablized output end.
Further, described bridge-type resonance circuit includes, power switch pipe, leakage inductance, transformer and the resonant capacitance being sequentially connected, and the drive signal for producing the power switch pipe between the power switch tube grid and the output par, c of described secondary side circuit is connected to, control the primary side control chip of its break-make.
Further, the ratio of winding of described current transformer is more than or equal to 200：1.
Further, the material of described current transformer is ferrocart core, and shape is preferred with annular.
Further, described electric current conversion potential circuit includes, electric capacity, first resistor, the first triode, the first diode, the second diode, the 3rd diode and the 4th diode, described electric capacity, the 3rd diode summation current transformer are sequentially connected, loop is constituted, is charged for described current transformer to described electric capacity；The grid connection of described electric capacity, the 4th diode and described rectifier switch pipe, for providing driving voltage to described rectifier switch pipe；Described first resistor, the first diode and described current transformer is sequentially connected so that the described multiple magnetic of current transformer electric discharge；The first described transistor base is connected with first diode cathode, colelctor electrode is connected with first diode cathode, emitter stage is connected with the 3rd diode cathode, shut-off for accelerating described synchronous rectifier, reduces the turn-off time of synchronous rectifier；The second described diode cathode is connected with described first resistor one end, and positive pole is connected with the first described diode cathode, the shut-off for accelerating first triode.
Further, described electric current conversion potential circuit also includes, second triode, the 3rd triode, second resistance, 3rd resistor and the 4th resistance, the grid of the colelctor electrode of the second described triode and the 3rd triode composition totem and the first described triode and described rectifier switch pipe is connected, for increasing current driving ability；Described second resistance is connected between the 3rd described transistor base and ground, for being discharged in time in described the 3rd triode shut-off；Described 3rd resistor is connected between the grid of the second described transistor emitter and described rectifier switch pipe, and resistance is variable, the conducting speed for reducing synchronous rectification switch pipe；The 4th described resistance is connected between described electric capacity and ground, for partial pressure.
The present invention, a kind of Medical Devices of the resonant transform circuit that there is synchronous rectification to control with applied to Medical Devices, including power circuit, it is characterised in that described power circuit is also included with the resonant transform circuit that there is synchronous rectification to control applied to Medical Devices.
Technical scheme provided by the present invention does not need delay circuit, does not detect that the electric current in the body-diode voltages of synchronous rectifier, secondary side winding passes through L1 yet（Or L2）It is converted into after low current, directly obtains Vg signals（As shown in Figure 5,6）, the body diode service time of secondary side synchronous rectifier is reduced as far as possible, further increases efficiency；Simultaneously as be use secondary side winding in electric current direct drive method, fundamentally avoid above and below two pipes alternate conduction, add in Medical Devices, such as supersonic imaging apparatus circuit reliability；It does not need extra control circuit or zero passage detection in addition, only want current transformer convert the current to low current conveniently form driving voltage drive and current transformer winding reset circuit, circuit is simply, with low cost.
Brief description of the drawings
For ease of explanation, the present invention is described in detail by following preferred embodiments and accompanying drawing.
Fig. 1 is controlled resonant converter switching frequency
When waveform diagram；
Fig. 2 is a kind of prior art block diagram with synchronous rectification LLC circuits；
Fig. 3 is another prior art block diagram with synchronous rectification LLC circuits；
Fig. 4 is a kind of theory diagram for the resonant transform circuit that there is synchronous rectification to control for being applied to Medical Devices of the present invention；
Fig. 5 is a kind of one embodiment circuit diagram of the synchronous rectification control for the resonant transform circuit that there is synchronous rectification to control for being applied to Medical Devices of the present invention；
Fig. 6 is a kind of another embodiment circuit diagram of the synchronous rectification control for the resonant transform circuit that there is synchronous rectification to control for being applied to Medical Devices of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples, the present invention will be described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
In order to make it easy to understand, before description specific embodiment, first the principle to the present invention carries out a simple introduction.Fig. 4 is seen, according to a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices proposed by the present invention, using Sofe Switch and secondary side synchronous rectification, among the design of efficient Switching Power Supply.
The present invention sets controller using in primary side circuit end, completes the control switched to resonance circuit, allows it to be operated in resonant condition by controlling its working frequency, main switch is operated in no-voltage opening state and maintain output voltage stabilization；And the synchronous rectification control of secondary side is directly driven with the electric current of secondary side, driving rectifying tube can not directly be brought based on high current, present invention employs current transformer, high current is converted into low current signal, it is converted into voltage signal to drive synchronous rectifier by voltage conversion circuit again, such electric current Complete Synchronization of the break-make of synchronous rectification switch pipe and winding, without other miscellaneous functions, the body diode for the reducing synchronous rectifier conducting of high degree, for High-current output circuit, this will farthest improve efficiency.
Simultaneously because equivalent to being directly winding current driving, synchronous rectification switch pipe will not occur because control chip detects that two parts synchronous rectifier is led directly to up and down caused by erroneous judgement, improves power supply reliability.
One high efficiency switch power supply example according to above-mentioned principle and using the synchronous rectification control method is described below.
As shown in Figure 4,5, 6, a kind of controlled resonant converter and its synchronous commutating control circuit.Main circuit structure wherein as shown in Figure 4, direct current input Vin, as the input of power supply, including：
Bridge-type resonance circuit, the part is included：At least one pair of power switch tube S 1, S2, transformer Lm and its leakage inductance Ls（Or separate inductor）, resonant capacitance Cs；Primary side control chip, the drive signal for producing primary side power switch pipe, controls its break-make, down tube is interlocked conducting, is operated in fixed duty cycle（About 50%）Under state, adjust working frequency to realize the stabilization of output voltage and ensure that switching tube is open-minded for no-voltage, its detailed annexation is as shown in Figure 4；
Secondary side circuit, including：Secondary side winding (Ns1 and Ns2, winding can be two and its more than), circuit of synchronous rectification (each winding correspondence one circuit of synchronous rectification) and output filter circuit, wherein circuit of synchronous rectification includes at least two synchronous rectification switch pipes（The synchronous rectification switch pipe of Q1 and Q2, corresponding one of each winding and its above, it is as multiple in corresponded to, it is connected in parallel with each other）, the rectification to secondary side winding Ns1 and Ns2 voltage is respectively used to, its drive signal is produced by corresponding winding current.Also include current transformer and current-to-voltage converting circuit, current transformer L1 and L2 (each secondary side winding corresponding a current transformer) have two parts winding respectively, one end of main winding is connected with secondary side winding, the other end is connected with output par, c, and output rated current is flowed through in this part；One end that an other winding for current transformer is also referred to as sensing winding is connected with electric current conversion potential circuit, and the other end is connected to the ground；Output filter circuit includes output capacitance Co, for being filtered to the voltage after synchronous rectification switch pipe rectification, the direct current output for being stablized output end.Being connected to being used between the current transformer and circuit of synchronous rectification is converted into voltage signal by current signal and drives the electric current of the circuit of synchronous rectification to change potential circuit, and described electric current conversion potential circuit is connected with the grid of described synchronous rectification switch pipe.Fig. 5,6 are two kinds of implementations that potential circuit is converted into during synchronous rectification of the present invention is controlled.
Electric current as shown in Figure 5 changes one embodiment of potential circuit, is described in detail below：
Described electric current conversion potential circuit includes：Electric capacity C1, first resistor R1, the first triode Q1, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4, described electric capacity, the 3rd diode summation current transformer are sequentially connected, loop is constituted, is charged for described current transformer to described electric capacity；The grid connection of described electric capacity, the 4th diode and described rectifier switch pipe, for providing driving voltage to described rectifier switch pipe；Described first resistor, the first diode and described current transformer is sequentially connected so that the described multiple magnetic of current transformer electric discharge；The first described transistor base is connected with first diode cathode, colelctor electrode is connected with first diode cathode, emitter stage is connected with the 3rd diode cathode, shut-off for accelerating described synchronous rectifier, reduces the turn-off time of synchronous rectifier；The second described diode cathode is connected with described first resistor one end, and positive pole is connected with the first described diode cathode, the shut-off for accelerating first triode.
Concrete principle is described as：Use current transformer in electric current in the case of just the synchronous rectification of secondary side, one driving voltage is obtained to C1 chargings by electric capacity C1, diode D3 by current transformer L1, voltage Vg driving synchronous rectification switch pipes are being obtained through diode D4, D4 effect is to prevent from that Vg is counter to fill so as to prevent the shut-off by mistake of synchronous rectification switch pipe, and now triode Q1 is off state；In the present embodiment, two synchronous rectifiers respectively have its own drive circuit up and down, the electric current be 0 and reversely after, resistance R1, diode D1, current transformer L1 constitutes current loop, current transformer L1 is set to discharge, i.e. current transformer L1 passes through resistance R1, the multiple magnetic of diode D1, produce and be ready for next driving voltage, pass through the triode Q1 shut-off for opening acceleration synchronization rectifying tube simultaneously, reduce the turn-off time of synchronous rectifier, 0 is reduced to after reverse current and for after just, diode D2 accelerates triode Q1 shut-offs, it is returned to current transformer L1 and passes through electric capacity C1, diode D3 starts next cycle to the state that electric capacity C1 chargings obtain a driving voltage.So in that a bit of Dead Time, the body diode of synchronous rectifier is no longer turned on, and improves transducer effciency.
Electric current as shown in Figure 6 changes another embodiment of potential circuit, is described in detail below：
Described electric current conversion potential circuit also includes compared with Fig. 5 embodiment：Second triode Q2, the 3rd triode Q3, second resistance R2,3rd resistor R3 and the 4th resistance R4, the grid of the colelctor electrode of the second described triode and the 3rd triode composition totem and the first described triode and described rectifier switch pipe is connected, for increasing current driving ability；Described second resistance is connected between the 3rd described transistor base and ground, for being discharged in time in described the 3rd triode shut-off；Described 3rd resistor is connected between the grid of the second described transistor emitter and described rectifier switch pipe, and resistance is variable, the conducting speed for reducing synchronous rectification switch pipe；The 4th described resistance is connected between described electric capacity and ground, for partial pressure.
Concrete principle is described as：Produced in the drive signal of the synchronous rectifier of secondary side, it directly can be driven by winding current through resistance sampling originally, but because electric current may be too big, or precision is inadequate, it is accurate selection using current transformer, voltage can be converted into minimum electric current to the full extent and carry out driving switch pipe, if the driving force of this drive signal is not enough to the switching tube for driving it to need to drive, then a totem being made up of triode Q2 and Q3 is added to increase driving force in the output end of drive signal, R3 is driving resistance, it is connected to synchronous rectification switch pipe, reduce the conducting speed of synchronous rectification switch pipe, the resistance can change, minimum can be to 0；Resistance R2 effect is to be discharged when triode Q3 is turned off to Q3, and its VCC that powers is provided by output voltage or other forms voltage is provided, and primary side current can farthest be followed the trail of by so flowing through the electric current of synchronous rectifier.
In the present embodiment, two parts synchronous rectifier needs respective current driving circuit up and down, therefore has two current transformers.It is bigger that the ratio of current transformer is done, and effect is better, in general, and the winding ratio of current transformer is 200:More than 1, the material of current transformer is ferrocart core, and shape is preferred with annular.
Table 1 below further illustrates the high efficiency of power supply characteristic using the synchronous rectification method.
Table 1：Example power-efficient（Export 19V）：
When synchronous rectifier it is more when, foregoing circuit may driving force it is not enough, now need to increase driving force, therefore add drive circuit, as shown in fig. 6, other parts are identical with Fig. 4.
Medical Devices of the present invention, including medical monitor, diasonograph, electrocardiograph, poct blood gas analyzers etc..
What deserves to be explained is, it can have the alternative solution of many modifications, for example in principle of the present invention：Multiple magnetic mode of the difference of current transformer etc.；For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, protection scope of the present invention should be all considered as belonging to.
Claims (10)
1. a kind of have the resonant transform circuit that synchronous rectification is controlled applied to Medical Devices, including, bridge-type resonance circuit and connected secondary side circuit, described secondary side circuit includes secondary side winding and the circuit of synchronous rectification being connected with each other, it is characterized in that, described secondary side circuit also includes, be connected with the secondary side winding be used for by high current be converted into the current transformer of low current signal and be connected between the current transformer and circuit of synchronous rectification be used for by current signal be converted into voltage signal and drive the circuit of synchronous rectification electric current change potential circuit；
Described current transformer includes main winding and sensing winding, one end of described main winding is connected with described secondary side winding, the other end is connected with the output par, c of the secondary side circuit, and described sensing winding one end is connected with described electric current conversion potential circuit, and the other end is connected to ground.
2. a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices according to claim 1, it is characterized in that, described circuit of synchronous rectification includes synchronous rectification switch pipe, and described electric current conversion potential circuit is connected with the grid of described synchronous rectification switch pipe.
3. a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices according to claim 2, it is characterized in that, described secondary side winding quantity be two and its more than, current transformer described in described each secondary side winding correspondence one and the electric current conversion potential circuit described in one, the number of the corresponding described synchronous rectification switch pipe of each described secondary side winding for one and its more than, if more than one synchronous rectification switch pipe, then be connected in parallel with each other.
4. a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices according to claim 3, it is characterized in that, described secondary side circuit also includes an output filter circuit, described output filter circuit is connected with the output par, c of the secondary side circuit, including output capacitance, for being filtered to the voltage after the circuit of synchronous rectification rectification, the direct current output for being stablized output end.
5. a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices according to claim 1, it is characterized in that, described bridge-type resonance circuit includes, power switch pipe, leakage inductance, transformer and the resonant capacitance being sequentially connected, and the drive signal for producing the power switch pipe between the power switch tube grid and the output par, c of described secondary side circuit is connected to, control the primary side control chip of its break-make.
6. a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices according to claim 1, it is characterised in that the ratio of winding of described current transformer is more than or equal to 200：1.
7. a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices according to claim 1, it is characterised in that the material of described current transformer is ferrocart core, is shaped as annular.
8. a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices according to claim 1, it is characterized in that, described electric current conversion potential circuit includes, electric capacity, first resistor, the first triode, the first diode, the second diode, the 3rd diode and the 4th diode, described electric capacity, the 3rd diode summation current transformer are sequentially connected, loop is constituted, is charged for described current transformer to described electric capacity；The grid connection of described electric capacity, the 4th diode and rectifier switch pipe, for providing driving voltage to described rectifier switch pipe；Described first resistor, the first diode and described current transformer is sequentially connected so that the described multiple magnetic of current transformer electric discharge；The first described transistor base is connected with first diode cathode, colelctor electrode is connected with first diode cathode, emitter stage is connected with the 3rd diode cathode, for the shut-off of acceleration synchronization rectifying tube, reduces the turn-off time of synchronous rectifier；The second described diode cathode is connected with described first resistor one end, and positive pole is connected with the first described diode cathode, the shut-off for accelerating first triode.
9. a kind of resonant transform circuit with synchronous rectification control applied to Medical Devices according to claim 8, it is characterized in that, described electric current conversion potential circuit also includes, second triode, the 3rd triode, second resistance, 3rd resistor and the 4th resistance, the grid of the colelctor electrode of the second described triode and the 3rd triode composition totem and the first described triode and described rectifier switch pipe is connected, for increasing current driving ability；Described second resistance is connected between the 3rd described transistor base and ground, for being discharged in time in described the 3rd triode shut-off；Described 3rd resistor is connected between the grid of the second described transistor emitter and described rectifier switch pipe, and resistance is variable, the conducting speed for reducing synchronous rectification switch pipe；The 4th described resistance is connected between described electric capacity and ground, for partial pressure.
10. a kind of Medical Devices with the resonant transform circuit as claimed in claim 1 with synchronous rectification control, including power circuit, it is characterised in that described power circuit includes the resonant transform circuit as claimed in claim 1 that there is synchronous rectification to control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110387403.2A CN102497104B (en) | 2011-11-30 | 2011-11-30 | Resonant transformation circuit applied to medical equipment and provided with synchronous rectification control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110387403.2A CN102497104B (en) | 2011-11-30 | 2011-11-30 | Resonant transformation circuit applied to medical equipment and provided with synchronous rectification control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102497104A CN102497104A (en) | 2012-06-13 |
| CN102497104B true CN102497104B (en) | 2014-04-30 |
Family
ID=46188902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110387403.2A Active CN102497104B (en) | 2011-11-30 | 2011-11-30 | Resonant transformation circuit applied to medical equipment and provided with synchronous rectification control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102497104B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441683B (en) * | 2013-09-12 | 2015-09-23 | 深圳开立生物医疗科技股份有限公司 | A kind of active clamp forward power circuit |
| ITUB20153819A1 (en) * | 2015-09-23 | 2017-03-23 | St Microelectronics Srl | PILOT CIRCUIT FOR SWITCHES SYNCHRONOUS RECTIFIERS IN RESONANT CONVERTERS, CONVERTER AND CORRESPONDENT PROCEDURE |
| CN110277914B (en) * | 2019-07-19 | 2020-11-27 | 电子科技大学 | Reverse flow comparator suitable for Boost converter |
| CN113804945B (en) * | 2021-09-17 | 2022-07-12 | 西安交通大学 | Current detection circuit, detection method and control method for synchronous rectification in high-frequency LLC (logical Link control) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11356044A (en) * | 1998-04-10 | 1999-12-24 | Sony Corp | Resonance type switching power supply |
| US7688600B2 (en) * | 2004-11-29 | 2010-03-30 | Nxp B.V. | Multi-Resonance converter |
| CN1787349A (en) * | 2005-12-10 | 2006-06-14 | 陈广华 | Vacuum electronic auto-power-cutting switch |
| GB2455568A (en) * | 2007-12-14 | 2009-06-17 | Eltek Valere As | Protection system for a resonant converter with synchronous rectification |
| CN101471606A (en) * | 2007-12-26 | 2009-07-01 | 深圳迈瑞生物医疗电子股份有限公司 | LLC resonant transformation device |
| CN101667783B (en) * | 2008-09-05 | 2013-01-30 | 艾默生网络能源系统北美公司 | Synchronous rectification drive device and method for converter |
-
2011
- 2011-11-30 CN CN201110387403.2A patent/CN102497104B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102497104A (en) | 2012-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105375783B (en) | The realization circuit of the control method and two methods of feedback and the asymmetrical half-bridge formula flyback converter based on this method | |
| CN101692595B (en) | Active clamping forward-flyback converter | |
| CN106685231B (en) | A kind of primary side clamper type soft switch full bridge converter and its asymmetric control method | |
| CN101562404B (en) | Resonance conversion device and synchronous rectification circuit thereof | |
| CN203911762U (en) | LLC resonance converting device | |
| TWI481181B (en) | Dc to ac power conversion apparatus and method thereof | |
| CN103813591B (en) | The CRM Flyback LED driver of low output current peak-to-average force ratio | |
| CN104980037B (en) | A kind of secondary adjusting type determines frequency controlled resonant converter and its control method | |
| CN105006974A (en) | Synchronous rectification control method, control device and switch power supply | |
| CN103944402A (en) | Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter | |
| CN105896986A (en) | Resonant converter and control method thereof | |
| CN2917083Y (en) | Normal/reverse excitation combined DC/DC isolated transformer | |
| CN104779828A (en) | High-efficiency photovoltaic grid connected inverter | |
| CN104852590B (en) | A kind of new three-level LLC resonance inverter | |
| CN102497104B (en) | Resonant transformation circuit applied to medical equipment and provided with synchronous rectification control | |
| CN102480221A (en) | Application method of PFC (power factor correction) controller in Buck circuit | |
| CN106533181A (en) | Double transformer parallel series LLC resonant DC-DC converter and control method of the same | |
| TWI797813B (en) | Converter for a wide range of output voltage and control method thereof | |
| CN113659837B (en) | Converter, converter control method and power adapter | |
| CN104539177B (en) | Synchronous rectification drive circuit and synchronous rectification method of switching power supply | |
| CN201312262Y (en) | High-frequency switch power supply with higher conversion efficiency | |
| CN102299632A (en) | Buck-boost direct-current converter | |
| CN105048824B (en) | A kind of voltage clamp Sofe Switch type recommends DC converter | |
| CN201376134Y (en) | NC soft switch full-bridge phase-shifted welding power source of welding machine | |
| CN1322660C (en) | Switch PWM convertor working at zero voltage and zero current of full bridge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |