CN103280774B - Circuit for power conversion and drive unit, switching tube protective device and method - Google Patents
Circuit for power conversion and drive unit, switching tube protective device and method Download PDFInfo
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- CN103280774B CN103280774B CN201310186220.3A CN201310186220A CN103280774B CN 103280774 B CN103280774 B CN 103280774B CN 201310186220 A CN201310186220 A CN 201310186220A CN 103280774 B CN103280774 B CN 103280774B
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- 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
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Abstract
The invention discloses a kind of circuit for power conversion and drive unit, switching tube protective device and method.Described switching tube protective device comprises: receiving element, for receiving the secondary-side switch pipe drive singal of LLC circuit; Signal generation unit, produces protecting group calibration signal for the former limit switching tube drive singal based on LLC circuit; Logical circuit, for carrying out logical operation, to produce protection triggering signal to protecting group calibration signal and secondary-side switch pipe drive singal; Protective circuit, for making former limit switching tube drive singal input according to protection triggering signal or not inputing to the former limit switching tube of LLC circuit.Switching tube protective device of the present invention; under can guaranteeing that switching tube is operated in Sofe Switch state simply and effectively; especially when the high level of secondary-side switch pipe drive singal arrives early than the high level of former limit switching tube drive singal; former limit switching tube drive singal can be turned off in time, thus effectively avoid switching tube to damage.
Description
Technical field
The invention belongs to electronic technology field, relate to and comprise the two inductance single capacitor of LLC() circuit for power conversion of circuit, particularly relate to circuit for power conversion and drive unit, switching tube protective device and method.
Background technology
LLC circuit is widely used in various circuit for power conversion.In general, not only loss is large under hard switching state for LLC circuit, but also likely damages metal-oxide-semiconductor.This is because, so-called hard switching state refers to, when opening, the electric current of switching device rises and voltage drop carries out simultaneously, and when turning off, the voltage rise of switching device and electric current decline and carry out simultaneously, and also namely the waveform of voltage and electric current exists overlapping, and create switching loss because the waveform of voltage and electric current is overlapping.Be explained as follows for the half-bridge LLC circuit with synchronous rectification shown in Fig. 1 in detail below.
When the operating frequency of LLC circuit is greater than resonance frequency, if the switching tube of secondary (hereinafter referred to as secondary-side switch pipe) S4 is early than switching tube (hereinafter referred to as former limit switching tube) the S1 conducting on former limit, clockwise electric current as shown in Figure 1 is then just had to flow through in secondary circuit, make in the circuit of former limit, also have clockwise electric current as shown in Figure 1 to flow through by transformer induction, cause diode D2 conducting, if now former limit switching tube S1 conducting again, then be equivalent to former limit switching tube S1 and diode D2 by short circuit between the power source bus on former limit and ground, now former limit switching tube S1 and S2 is pass-through state, thus cause the rising of the electric current at switching tube S1 place, former limit to be carried out with voltage drop simultaneously, and the electric current at switching tube S2 place, former limit rises and voltage drop also carries out simultaneously, also namely former limit switching tube S1 and S2 enters serious hard switching state.
Because hard switching state can cause switching loss to increase, time serious, even cause switching tube to damage, be necessary to adopt Sofe Switch detection technique in LLC circuit, under guaranteeing that switching tube is operated in Sofe Switch state.But existing Sofe Switch detects to be electric current by current transformer or resistance detecting circuit and to carry out Sofe Switch judgement, control procedure and implementation all more complicated according to the sense of current.
Summary of the invention
technical problem
In view of this, the technical problem to be solved in the present invention is, under the switching tube how guaranteeing in LLC circuit is simply and effectively operated in Sofe Switch state.
technical scheme
In order to solve the problems of the technologies described above, according to one embodiment of the invention, provide a kind of switching tube protective device, comprising:
Receiving element, is connected with the secondary-side switch tube drive circuit of LLC circuit, for receiving the secondary-side switch pipe drive singal that described secondary-side switch tube drive circuit exports;
Signal generation unit, is connected with the former limit switch tube driving circuit of described LLC circuit, produces protecting group calibration signal for the former limit switching tube drive singal exported based on described former limit switch tube driving circuit;
Logical circuit, is connected with described signal generation unit and described receiving element, for carrying out logical operation, to produce protection triggering signal to described protecting group calibration signal and described secondary-side switch pipe drive singal; And
Protective circuit, is connected with described logical circuit and described former limit switch tube driving circuit, inputs or do not input to the former limit switching tube of described LLC circuit for making described former limit switching tube drive singal according to described protection triggering signal.
For above-mentioned switching tube protective device; in a kind of possible implementation; described protecting group calibration signal and described former limit switching tube drive singal are square-wave signal, and the trailing edge of described protecting group calibration signal corresponds to the rising edge of described former limit switching tube drive singal.
For above-mentioned switching tube protective device, in a kind of possible implementation, described logical circuit is logical AND gate; Described protective circuit, when described protection triggering signal is high level, makes described former limit switching tube drive singal not input to described former limit switching tube.
In order to solve the problems of the technologies described above, according to another embodiment of the present invention, provide a kind of drive unit, comprising:
Former limit switch tube driving circuit, is connected with the former limit switching tube of LLC circuit, for exporting former limit switching tube drive singal to described former limit switching tube;
Secondary-side switch tube drive circuit, is connected with the secondary-side switch pipe of described LLC circuit, for exporting secondary-side switch pipe drive singal to described secondary-side switch pipe;
Signal generation unit, is connected with the former limit switch tube driving circuit of LLC circuit, for producing protecting group calibration signal based on described former limit switching tube drive singal;
Logical circuit, is connected with described signal generation unit and described secondary-side switch tube drive circuit, for carrying out logical operation, to produce protection triggering signal to described protecting group calibration signal and described secondary-side switch pipe drive singal; And
Protective circuit, is connected with described logical circuit and described former limit switch tube driving circuit, for making the switching tube drive singal input of described former limit according to described protection triggering signal or not inputing to described former limit switching tube.
For above-mentioned drive unit, in a kind of possible implementation, described protecting group calibration signal and described former limit switching tube drive singal are square-wave signal, and the trailing edge of described protecting group calibration signal corresponds to the rising edge of described former limit switching tube drive singal.
For above-mentioned drive unit, in a kind of possible implementation, described logical circuit is logical AND gate; Described protective circuit, when described protection triggering signal is high level, makes described former limit switching tube drive singal not input to described former limit switching tube.
In order to solve the problems of the technologies described above, according to still another embodiment of the invention, provide a kind of circuit for power conversion, comprising: LLC circuit; Any one drive unit as above, is connected with described LLC circuit, for exporting former limit switching tube drive singal to the former limit switching tube of described LLC circuit and exporting secondary-side switch pipe drive singal to the secondary-side switch pipe of described LLC circuit.
For above-mentioned circuit for power conversion, in a kind of possible implementation, described LLC circuit is full-bridge LLC circuit or half-bridge LLC circuit.
For above-mentioned circuit for power conversion, in a kind of possible implementation, also comprise circuit of synchronous rectification.
In order to solve the problems of the technologies described above, according to one more embodiment of the present invention, provide a kind of switching tube guard method, comprising:
The former limit switching tube drive singal exported based on the former limit switch tube driving circuit of LLC circuit produces protecting group calibration signal;
The secondary-side switch pipe drive singal that the secondary-side switch tube drive circuit receiving described LLC circuit exports;
Logical operation is carried out, to produce protection triggering signal to described protecting group calibration signal and described secondary-side switch pipe drive singal; And
Make the switching tube drive singal input of described former limit according to described protection triggering signal or do not input to the former limit switching tube of described LLC circuit.
For above-mentioned switching tube guard method; in a kind of possible implementation; described protecting group calibration signal and described former limit switching tube drive singal are square-wave signal, and the trailing edge of described protecting group calibration signal corresponds to the rising edge of described former limit switching tube drive singal.
For above-mentioned switching tube guard method, in a kind of possible implementation, described the step that described protecting group calibration signal and described secondary-side switch pipe drive singal carry out logical operation to be comprised, logical AND operation is carried out to described protecting group calibration signal and described secondary-side switch pipe drive singal; And
Describedly according to described protection triggering signal, the step of the input of described former limit switching tube drive singal or the former limit switching tube that do not input to described LLC circuit is comprised; when described protection triggering signal is high level, described former limit switching tube drive singal is made not input to described former limit switching tube.
beneficial effect
By producing protecting group calibration signal based on former limit switching tube drive singal, and join protection reference signal and secondary-side switch pipe drive singal determine the break-make of former limit switching tube drive singal to former limit switching tube, circuit for power conversion according to the abovementioned embodiments of the present invention and drive unit thereof, switching tube protective device and method, under can guaranteeing that switching tube is operated in Sofe Switch state simply and effectively, especially when the high level of secondary-side switch pipe drive singal arrives early than the high level of former limit switching tube drive singal, former limit switching tube drive singal can be turned off in time, thus effectively avoid switching tube to damage.
According to below with reference to the accompanying drawings to detailed description of illustrative embodiments, further feature of the present invention and aspect will become clear.
Accompanying drawing explanation
Various exemplary embodiment of the present invention, characteristic sum aspect is described in detail below with reference to accompanying drawing.The same or analogous element of Reference numeral presentation function identical in accompanying drawing.Although the various aspects of embodiment shown in the drawings, unless otherwise indicated, accompanying drawing need not be drawn in proportion.
Word " exemplary " special here means " as example, embodiment or illustrative ".Here need not be interpreted as being better than or being better than other embodiment as any embodiment illustrated by " exemplary ".
In addition, in order to better the present invention is described, in embodiment hereafter, give numerous details.It will be appreciated by those skilled in the art that do not have these details, the present invention can implement equally.In other example, known method, means, element and circuit are not described in detail, so that highlight purport of the present invention.
When Fig. 1 illustrates that secondary-side switch pipe S4 drive singal is early than former limit switching tube S1 drive singal in the half-bridge LLC circuit of synchronous rectification, the sense of current schematic diagram in described half-bridge LLC circuit;
Fig. 2 illustrates the block diagram of switching tube protective device according to an embodiment of the invention;
Main waveform schematic diagram when Fig. 3 illustrates that the protective device of switching tube shown in Fig. 2 is applied to LLC circuit;
Fig. 4 illustrates that the protective device of switching tube shown in Fig. 2 is applied to the circuit diagram of an example of half-bridge LLC circuit;
Fig. 5 illustrates that the protective device of switching tube shown in Fig. 2 is applied to the circuit diagram of another example of half-bridge LLC circuit;
Fig. 6 illustrates that the protective device of switching tube shown in Fig. 2 is applied to the circuit diagram of an example of full-bridge LLC circuit;
Fig. 7 illustrates the block diagram of the circuit for power conversion comprising drive unit according to an embodiment of the invention;
Fig. 8 illustrates the flow chart of switching tube guard method according to an embodiment of the invention.
Embodiment
In embodiment hereafter, convenient in order to describe, former limit switching tube also can be called supervisor, and secondary-side switch pipe also can be called lock-in tube.
embodiment one
Fig. 2 illustrates the block diagram of switching tube protective device according to an embodiment of the invention.
As shown in Figure 2, described switching tube protective device mainly comprises receiving element 210, signal generation unit 220, logical circuit 230 and protective circuit 240.Wherein, secondary-side switch tube drive circuit 720 and the logical circuit 230 of receiving element 210 and LLC circuit 810 are connected, be mainly used in the secondary-side switch pipe drive singal receiving the output of secondary-side switch tube drive circuit 720, and export received secondary-side switch pipe drive singal to logical circuit 230.Former limit switch tube driving circuit 710 and the logical circuit 230 of signal generation unit 220 and LLC circuit 810 are connected; the former limit switching tube drive singal being mainly used in exporting based on former limit switch tube driving circuit 710 produces protecting group calibration signal, and exports produced protecting group calibration signal to logical circuit 230.Logical circuit 230 is connected with receiving element 210, signal generation unit 220 and protective circuit 240; be mainly used in carrying out logical operation to protecting group calibration signal and described secondary-side switch pipe drive singal; to produce protection triggering signal, and export produced protection triggering signal to protective circuit 240.Protective circuit 240 is connected with the former limit switch tube driving circuit 710 of logical circuit 230 and LLC circuit 810, is mainly used in the former limit switching tube drive singal input former limit switch tube driving circuit 710 being exported according to protection triggering signal or the former limit switching tube not inputing to LLC circuit 810.
Wherein, in LLC circuit 810, the former limit switching tube drive singal that former limit switching tube exports according to former limit switch tube driving circuit 710 and conducting or shutoff, the secondary-side switch pipe drive singal that secondary-side switch pipe exports according to secondary-side switch tube drive circuit 720 and conducting or shutoff.
For above-mentioned switching tube protective device; in a kind of possible implementation; as shown in Figure 3, protecting group calibration signal and former limit switching tube drive singal can be square-wave signal, and the trailing edge of protecting group calibration signal can correspond to the rising edge of former limit switching tube drive singal.And; in a kind of possible specific implementation; signal generation unit 220 can also change the width of protecting group calibration signal; as long as the width of protecting group calibration signal meets duty ratio in LLC circuit 810 be no more than the requirement of 50%, this change can not affect the protection that switching tube protective device according to the above embodiment of the present invention realizes switch tube
For above-mentioned switching tube protective device, in a kind of possible implementation, logical circuit 230 can be logical AND gate.Protective circuit 240 can be configured to, when protecting triggering signal to be high level, make former limit switching tube drive singal not input to former limit switching tube.
Below will with waveform shown in Fig. 3 exemplarily, the operation principle that LLC circuit carries out switching tube protection is applied to switching tube protective device according to the above embodiment of the present invention and is explained as follows in detail.
As shown in Figure 3, in the t0 moment, the rising edge of secondary-side switch pipe drive singal does not arrive, now the rising edge of former limit switching tube drive singal arrives, namely the high level of secondary-side switch pipe drive singal is later than the high level arrival of former limit switching tube drive singal, and the trailing edge of protecting group calibration signal arrives simultaneously;
Between the t0 moment to t1 moment, logical circuit 230 pairs of protecting group calibration signal and secondary-side switch pipe drive singal carry out logical "and", and to operate the protection triggering signal obtained be low level, protective circuit 240 detects that protection triggering signal is low level, therefore can not trigger protection, protective circuit 240 makes former limit switching tube drive singal input to former limit switching tube, thus make the switching tube conducting of former limit, ensure that former limit switching tube normally works;
In the t1 moment, the rising edge of secondary-side switch pipe drive singal arrives, and now former limit switching tube drive singal is high level, and protecting group calibration signal is low level simultaneously;
Between the t1 moment to t2 moment, logical circuit 230 pairs of protecting group calibration signal and secondary-side switch pipe drive singal carry out logical "and", and to operate the protection triggering signal obtained be low level, protective circuit 240 detects that protection triggering signal is low level, therefore can not trigger protection, protective circuit 240 makes former limit switching tube drive singal input to former limit switching tube, thus make the switching tube conducting of former limit, ensure that former limit switching tube normally works;
In the t2 moment, the rising edge of secondary-side switch pipe drive singal arrives, now the rising edge of former limit switching tube drive singal does not arrive, and namely the high level of secondary-side switch pipe drive singal arrives early than the high level of former limit switching tube drive singal, and the trailing edge of protecting group calibration signal does not arrive simultaneously;
Between the t2 moment to t3 moment, logical circuit 230 pairs of protecting group calibration signal and secondary-side switch pipe drive singal carry out logical "and", and to operate the protection triggering signal obtained be high level, protective circuit 240 detects that protection triggering signal is high level, therefore can trigger protection, protective circuit 240 makes former limit switching tube drive singal not input to former limit switching tube, thus former limit switching tube is turned off, ensure that former limit switching tube can not damage;
In the t3 moment, secondary-side switch pipe drive singal is high level, and now the rising edge of former limit switching tube drive singal arrives, and the trailing edge of protecting group calibration signal arrives simultaneously;
Between the next rising edge due in of t3 moment to secondary-side switch pipe drive singal, switching tube protective device according to the above embodiment of the present invention continues by above-mentioned principle work, thus realizes the protection of switch tube.
Fig. 4 illustrates that the protective device of switching tube shown in Fig. 2 is applied to the circuit diagram of an example of half-bridge LLC circuit.
Fig. 5 illustrates that the protective device of switching tube shown in Fig. 2 is applied to the circuit diagram of another example of half-bridge LLC circuit.
Fig. 6 illustrates that the protective device of switching tube shown in Fig. 2 is applied to the circuit diagram of an example of full-bridge LLC circuit.
Switching tube protective device according to the above embodiment of the present invention; in a kind of possible implementation; as shown in Fig. 4 ~ Fig. 6; described switching tube protective device can be applied in the circuit for power conversion comprising half-bridge LLC circuit or full-bridge LLC circuit, can protect single or multiple switching tube.
Wherein, as shown in Figure 4; described switching tube protective device can be connected with former limit switching tube S1 drive circuit 410 and secondary-side switch pipe S4 drive circuit 420, thus based on former limit switching tube S1 drive singal and secondary-side switch pipe S4 drive singal, can protect former limit switching tube S1.
As shown in Figure 5; described switching tube protective device can be connected with former limit switching tube S1 drive circuit 410, secondary-side switch pipe S4 drive circuit 420, former limit switching tube S2 drive circuit 510 and secondary-side switch pipe S3 drive circuit 520; thus can protect former limit switching tube S1 based on secondary-side switch pipe S4 drive singal, and based on secondary-side switch pipe S3 drive singal, former limit switching tube S2 is protected.
As shown in Figure 6; described switching tube protective device can be connected with former limit switching tube S1 drive circuit 410, secondary-side switch pipe S4 drive circuit 420, former limit switching tube S2 drive circuit 510, secondary-side switch pipe S3 drive circuit 520, former limit switching tube S10 drive circuit 610 and former limit switching tube S20 drive circuit 620; thus can protect former limit switching tube S1 and S20 based on secondary-side switch pipe S4 drive singal, and based on secondary-side switch pipe S3 drive singal, former limit switching tube S2 and S10 is protected.Wherein, in order to ensure that full-bridge LLC circuit normally works, former limit switching tube S1 drive singal and former limit switching tube S20 drive singal are same signal, and former limit switching tube S2 drive singal and former limit switching tube S10 drive singal are same signal.
In addition; in a kind of possible implementation; receiving element 210, signal generation unit 220, protective circuit 240 and logical circuit 230 can by hardware circuit or the software simulating comprising processor; processor can by DSP or CPLD(Complex Programmable Logic Device; CPLD) or FPGA(Field-Programmable Gate Array, field programmable gate array) but be not limited to DSP or CPLD or FPGA realization.Such as: receiving element 210 can be realized by the receiver port of processor inside, signal generation unit 220 can by the hardware implementing of processor inside, and protective circuit 240 can be realized by configuration internal register by the hardware of processor inside.Logical circuit 230 can be not limited to gate circuit or the logical circuit that is made up of discrete device realizes by gate circuit or the logical circuit be made up of discrete device.Such as: logical "and" can be realized by AND circuit and operate.
By producing protecting group calibration signal join protection reference signal and secondary-side switch pipe drive singal determine that former limit switching tube drive singal inputs to the break-make of former limit switching tube based on former limit switching tube drive singal; switching tube protective device according to the above embodiment of the present invention; under can guaranteeing that switching tube is operated in Sofe Switch state simply and effectively; especially when the high level of secondary-side switch pipe drive singal arrives early than the high level of former limit switching tube drive singal; former limit switching tube drive singal can be turned off in time, thus effectively avoid switching tube to damage.
embodiment two
Fig. 7 illustrates the block diagram of drive unit according to an embodiment of the invention.Assembly identical with Fig. 2 label in Fig. 7 has identical function.
As shown in Figure 7, described drive unit mainly comprises former limit switch tube driving circuit 710, secondary-side switch tube drive circuit 720, signal generation unit 220, logical circuit 230 and protective circuit 240.Wherein, former limit switch tube driving circuit 710 is connected with the former limit switching tube of LLC circuit 810, is mainly used in exporting former limit switching tube drive singal to former limit switching tube.Secondary-side switch tube drive circuit 720 is connected with the secondary-side switch pipe of LLC circuit 810, is mainly used in exporting secondary-side switch pipe drive singal to secondary-side switch pipe.Signal generation unit 220 is connected with the former limit switch tube driving circuit 710 of LLC circuit 810, is mainly used in producing protecting group calibration signal based on former limit switching tube drive singal.Logical circuit 230 is connected with signal generation unit 220 and secondary-side switch tube drive circuit 720, is mainly used in carrying out logical operation, to produce protection triggering signal to protecting group calibration signal and secondary-side switch pipe drive singal.Protective circuit 240 is connected with logical circuit 230 and former limit switch tube driving circuit 710, is mainly used in making the switching tube drive singal input of former limit according to protection triggering signal or not inputing to former limit switching tube.
For above-mentioned drive unit, in a kind of possible implementation, protecting group calibration signal and former limit switching tube drive singal are square-wave signal, and the trailing edge of protecting group calibration signal corresponds to the rising edge of former limit switching tube drive singal.
For above-mentioned drive unit, in a kind of possible implementation, logical circuit 230 is logical AND gate.Protective circuit 240, when protecting triggering signal to be high level, makes former limit switching tube drive singal not input to former limit switching tube.
Drive unit according to the above embodiment of the present invention is applied to the operation principle that LLC circuit 810 carries out switching tube protection; with above for switching tube protective device according to the above embodiment of the present invention explain similar; those skilled in the art will be understood that aforesaid possible implementation all can be applicable to the present embodiment and can obtain identical beneficial effect, do not repeat them here.
embodiment three
Fig. 8 illustrates the block diagram of circuit for power conversion according to an embodiment of the invention.Assembly identical with Fig. 2 label in Fig. 7 has identical function, for simplicity's sake, omits the detailed description to these assemblies.
As shown in Figure 7, described circuit for power conversion mainly comprises following assembly: LLC circuit 810 and any one drive unit 820 according to the above embodiment of the present invention.Wherein, former limit switch tube driving circuit in drive unit 820 is used for exporting former limit switching tube drive singal to the former limit switching tube of LLC circuit 810; secondary-side switch pipe in drive unit 820 is used for exporting secondary-side switch pipe drive singal to the secondary-side switch pipe of LLC circuit 810, and the protection triggering signal that the protective circuit in drive unit 820 can export according to logical circuit determines the break-make of former limit switching tube drive singal to former limit switching tube.Wherein, it is similar that the protective circuit in drive unit 820, logical circuit and signal generation unit and above reference diagram 7 are introduced, and do not repeat them here.
For above-mentioned circuit for power conversion, in a kind of possible implementation, LLC circuit 810 can be full-bridge LLC circuit or half-bridge LLC circuit.
For above-mentioned circuit for power conversion, in a kind of possible implementation, the operating frequency of described LLC circuit is greater than resonance frequency.
For above-mentioned circuit for power conversion, in a kind of possible implementation, also comprise circuit of synchronous rectification.
Switching tube protection mechanism in circuit for power conversion according to the above embodiment of the present invention; with above for switching tube protective device according to the above embodiment of the present invention explain similar; those skilled in the art will be understood that aforesaid possible implementation all can be applicable to the present embodiment and can obtain identical beneficial effect, do not repeat them here.
embodiment four
Fig. 8 illustrates the flow chart of switching tube guard method according to an embodiment of the invention.
As shown in Figure 8, described switching tube guard method mainly comprises the following steps:
Step 910, the former limit switching tube drive singal generation protecting group calibration signal exported based on the former limit switch tube driving circuit 710 of LLC circuit 810;
The secondary-side switch pipe drive singal that step 920, the secondary-side switch tube drive circuit 720 receiving LLC circuit 810 export;
Step 930, logical operation is carried out, to produce protection triggering signal to protecting group calibration signal and secondary-side switch pipe drive singal; And
Step 940, to make switching tube drive singal input in former limit according to protection triggering signal or do not input to the former limit switching tube of LLC circuit 810.
For above-mentioned switching tube guard method, in a kind of possible implementation, protecting group calibration signal and former limit switching tube drive singal are square-wave signal, and the trailing edge of protecting group calibration signal corresponds to the rising edge of former limit switching tube drive singal.In this case; in a kind of possible specific implementation; step 930 can comprise carries out logical "and" operation to protecting group calibration signal and secondary-side switch pipe drive singal; and step 940 can be included in described protection triggering signal when being high level, described former limit switching tube drive singal is made not input to described former limit switching tube.
By producing based on former limit switching tube drive singal the break-make that protecting group calibration signal join protection reference signal and secondary-side switch pipe drive singal determine former limit switching tube drive singal; switching tube guard method according to the above embodiment of the present invention; under can guaranteeing that switching tube is operated in Sofe Switch state simply and effectively; especially when the high level of secondary-side switch pipe drive singal arrives early than the high level of former limit switching tube drive singal; former limit switching tube drive singal can be turned off in time, thus effectively avoid switching tube to damage.
Those of ordinary skill in the art can recognize, each exemplary cell in embodiment described herein and algorithm steps, can realize with the combination of electronic hardware or computer software and electronic hardware.These functions realize with hardware or software form actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can realize described function for specific application choice diverse ways, but this realization should not thought and exceeds scope of the present invention.
If using the form of computer software realize described function and as independently production marketing or use time, then can think that all or part of (such as to the part that prior art contributes) of technical scheme of the present invention embodies in form of a computer software product to a certain extent.Described computer software product is stored in the storage medium of embodied on computer readable usually, comprises all or part of step of some instructions in order to make computer equipment (can be personal computer, server or the network equipment etc.) perform various embodiments of the present invention method.And aforesaid storage medium comprise USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; also invention can be considered to be applied to other circuit for power conversion; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (14)
1. a switching tube protective device, is characterized in that, comprising:
Receiving element (210), is connected with the secondary-side switch tube drive circuit (720) of LLC circuit (810), for receiving the secondary-side switch pipe drive singal that described secondary-side switch tube drive circuit (720) exports;
Signal generation unit (220), be connected with former limit switch tube driving circuit (710) of described LLC circuit (810), produce protecting group calibration signal for the former limit switching tube drive singal exported based on described former limit switch tube driving circuit (710);
Logical circuit (230), be connected with described signal generation unit (220) and described receiving element (210), for carrying out logical operation, to produce protection triggering signal to described protecting group calibration signal and described secondary-side switch pipe drive singal; And
Protective circuit (240); be connected with described logical circuit (230) and described former limit switch tube driving circuit (710), input for making described former limit switching tube drive singal according to described protection triggering signal or do not input to the former limit switching tube of described LLC circuit (810).
2. switching tube protective device according to claim 1, is characterized in that,
Described protecting group calibration signal and described former limit switching tube drive singal are square-wave signal, and the trailing edge of described protecting group calibration signal corresponds to the rising edge of described former limit switching tube drive singal.
3. switching tube protective device according to claim 2, is characterized in that,
Described logical circuit (230) is logical AND gate; And
Described protective circuit (240), when described protection triggering signal is high level, makes described former limit switching tube drive singal not input to described former limit switching tube.
4. a drive unit, is characterized in that, comprising:
Former limit switch tube driving circuit (710), is connected with the former limit switching tube of LLC circuit (810), for exporting former limit switching tube drive singal to described former limit switching tube;
Secondary-side switch tube drive circuit (720), is connected with the secondary-side switch pipe of described LLC circuit (810), for exporting secondary-side switch pipe drive singal to described secondary-side switch pipe;
Signal generation unit (220), is connected with former limit switch tube driving circuit (710) of described LLC circuit (810), for producing protecting group calibration signal based on described former limit switching tube drive singal;
Logical circuit (230), be connected with described signal generation unit (220) and described secondary-side switch tube drive circuit (720), for carrying out logical operation, to produce protection triggering signal to described protecting group calibration signal and described secondary-side switch pipe drive singal; And
Protective circuit (240); be connected with described logical circuit (230) and described former limit switch tube driving circuit (710), for making the switching tube drive singal input of described former limit according to described protection triggering signal or not inputing to described former limit switching tube.
5. drive unit according to claim 4, is characterized in that,
Described protecting group calibration signal and described former limit switching tube drive singal are square-wave signal, and the trailing edge of described protecting group calibration signal corresponds to the rising edge of described former limit switching tube drive singal.
6. drive unit according to claim 5, is characterized in that,
Described logical circuit (230) is logical AND gate; And
Described protective circuit (240), when described protection triggering signal is high level, makes described former limit switching tube drive singal not input to described former limit switching tube.
7. a circuit for power conversion, is characterized in that, comprising:
LLC circuit (810); And
Drive unit (820) according to any one of claim 4 to 6, be connected with described LLC circuit (810), for exporting former limit switching tube drive singal to the former limit switching tube of described LLC circuit (810) and exporting secondary-side switch pipe drive singal to the secondary-side switch pipe of described LLC circuit (810).
8. circuit for power conversion according to claim 7, is characterized in that, described LLC circuit (810) is full-bridge LLC circuit.
9. circuit for power conversion according to claim 7, is characterized in that, described LLC circuit (810) is half-bridge LLC circuit.
10. circuit for power conversion according to claim 7, is characterized in that, also comprises circuit of synchronous rectification.
11. circuit for power conversion according to any one of claim 7 to 10, it is characterized in that, the operating frequency of described LLC circuit is greater than resonance frequency.
12. 1 kinds of switching tube guard methods, is characterized in that, comprising:
The former limit switching tube drive singal exported based on former limit switch tube driving circuit (710) of LLC circuit (810) produces protecting group calibration signal;
The secondary-side switch pipe drive singal that the secondary-side switch tube drive circuit (720) receiving described LLC circuit (810) exports;
Logical operation is carried out, to produce protection triggering signal to described protecting group calibration signal and described secondary-side switch pipe drive singal; And
Make the switching tube drive singal input of described former limit according to described protection triggering signal or do not input to the former limit switching tube of described LLC circuit (810).
13. switching tube guard methods according to claim 12, is characterized in that,
Described protecting group calibration signal and described former limit switching tube drive singal are square-wave signal, and the trailing edge of described protecting group calibration signal corresponds to the rising edge of described former limit switching tube drive singal.
14. switching tube guard methods according to claim 13, is characterized in that,
Described the step that described protecting group calibration signal and described secondary-side switch pipe drive singal carry out logical operation to be comprised, logical AND operation is carried out to described protecting group calibration signal and described secondary-side switch pipe drive singal; And
Describedly according to described protection triggering signal, the step of the input of described former limit switching tube drive singal or the former limit switching tube that do not input to described LLC circuit (810) is comprised; when described protection triggering signal is high level, described former limit switching tube drive singal is made not input to described former limit switching tube.
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| US9350260B2 (en) | 2013-11-07 | 2016-05-24 | Futurewei Technologies, Inc. | Startup method and system for resonant converters |
| CN103997327B (en) * | 2014-05-19 | 2017-06-06 | 华为技术有限公司 | A kind of ripple of losing of drive signal detects circuit and switch tube driving circuit |
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| CN101071984A (en) * | 2006-05-11 | 2007-11-14 | 富士通株式会社 | Controller for dc-dc converter |
| CN101895201A (en) * | 2010-07-23 | 2010-11-24 | 中兴通讯股份有限公司 | LLC (Logical Link Control) series resonance converter and drive method thereof |
| CN102355147A (en) * | 2011-10-28 | 2012-02-15 | 上海大学 | Digital control device and method for LLC (logical link control) synchronously-rectified resonant converter |
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| JP4735072B2 (en) * | 2005-06-23 | 2011-07-27 | サンケン電気株式会社 | Switching power supply |
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| CN101071984A (en) * | 2006-05-11 | 2007-11-14 | 富士通株式会社 | Controller for dc-dc converter |
| CN101895201A (en) * | 2010-07-23 | 2010-11-24 | 中兴通讯股份有限公司 | LLC (Logical Link Control) series resonance converter and drive method thereof |
| CN102355147A (en) * | 2011-10-28 | 2012-02-15 | 上海大学 | Digital control device and method for LLC (logical link control) synchronously-rectified resonant converter |
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