CN202135059U - Half-bridge LLC resonant converter - Google Patents
Half-bridge LLC resonant converter Download PDFInfo
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- CN202135059U CN202135059U CN201120227442U CN201120227442U CN202135059U CN 202135059 U CN202135059 U CN 202135059U CN 201120227442 U CN201120227442 U CN 201120227442U CN 201120227442 U CN201120227442 U CN 201120227442U CN 202135059 U CN202135059 U CN 202135059U
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
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Abstract
The utility model discloses a half-bridge LLC resonant converter, which comprises a primary circuit and a voltage equalizing circuit, wherein the primary circuit comprises a first switch, a second switch, a resonant inductor, a primary coil of a transformer, and a resonant capacitor, the voltage equalizing circuit comprises a first resistor and a second resistor that are same in resistance, the first terminal of the first resistor is connected with the positive output terminal of a pre-stage circuit output terminal, the first terminal of the second resistor is connected with the negative output terminal of the pre-stage circuit output terminal, and the second terminal of the first resistor and the second terminal of the second resistor are connected and are connected with the first terminal of the resonant capacitor, or the series connection terminal of the resonant inductor and the primary coil of the transformer, or the midpoint of a half-bridge circuit. The half-bridge LLC resonant converter adds the voltage equalizing circuit in the circuit so as to make the conversion of current in a resonant body from one direction to another direction relatively stable at the moment of starting, thereby improving the reliability of the half-bridge LLC resonant converter at the moment of starting.
Description
Technical field
The utility model relates to a kind of half-bridge logical link control (LLC) resonant converter.
Background technology
About half-bridge logical link control (LLC) resonant converter, a large amount of research has been arranged in recent years.Half-bridge logical link control (LLC) resonant converter comprises transformer, can it be divided into former limit circuit and secondary circuit when therefore analyzing.As shown in Figure 1, be the former limit circuit diagram of existing half-bridge logical link control (LLC) resonant converter, former limit circuit comprises the primary coil T-A resonant capacitor C S of the first switching tube Q1, second switch pipe Q2, resonant inductance LS, transformer.Wherein, diode DS1, DS2 are respectively the body diode of the first switching tube Q1 and second switch pipe Q2.The first switching tube Q1 and second switch pipe Q2 are composed in series half-bridge circuit 100, and an end of half-bridge circuit 100 connects the positive output end of front stage circuits output Vi, and the other end connects the negative output terminal of front stage circuits output Vi; Resonant inductance LS, transformer primary coil T-A resonant capacitor C S are composed in series resonant body 200, and resonant body 200 1 ends connect the mid point of half-bridge circuit 100, and the other end connects the negative output terminal of front stage circuits output Vi.This half-bridge logical link control (LLC) resonant converter; Some restrictions are being arranged aspect the device selection; Mainly promptly be MOS memory (the Metal-Oxide-Semiconductor Field-Effect Transistor that the first switching tube Q1 and second switch pipe Q2 need select to have fast recovery body diode; Abbreviate MOSFET as); Reason is: half-bridge logical link control (LLC) resonant converter can form the reverse heavy current of zero passage in circuit start work moment on the body diode DS2 of second switch pipe Q2, and promptly the electric current on the body diode DS2 of second switch pipe Q2 can be transformed into a reverse value from a value of a direction at short notice, and difference is bigger between two values.If the therefore body diode of metal-oxide-semiconductor quick-recovery soon, metal-oxide-semiconductor will burn in moment.Therefore also just need select tape to recover first switching tube Q1 and the second switch pipe Q2 of the metal-oxide-semiconductor of body diode soon, to guarantee that half-bridge logical link control (LLC) resonant converter is in the reliability that starts moment as circuit.Yet the restriction that this device is selected has limited the flexibility that metal-oxide-semiconductor is selected on the one hand, has also directly caused the circuit cost of LLC resonance converter higher on the other hand.Simultaneously because this LLC resonance converter self work characteristics, the ifs circuit parameter choosing is improper, can reduce the reliability of startup moment of half-bridge logical link control (LLC) resonant converter too.
The utility model content
The utility model technical problem to be solved is: the deficiency that remedies above-mentioned prior art; A kind of half-bridge logical link control (LLC) resonant converter is proposed; Can improve the reliability of startup moment of half-bridge logical link control (LLC) resonant converter, thereby needn't require switching tube must select tape to recover the metal-oxide-semiconductor of body diode soon.
The technical problem of the utility model solves through following technical scheme:
A kind of half-bridge logical link control (LLC) resonant converter comprises former limit circuit, and said former limit circuit comprises the primary coil resonant electric capacity of first switching tube, second switch pipe, resonant inductance, transformer; Said first switching tube and second switch pipe are composed in series half-bridge circuit, and an end of said half-bridge circuit connects the positive output end of front stage circuits output, and the other end connects the negative output terminal of said front stage circuits output; Said resonant inductance is connected the mid point of said half-bridge circuit with primary coil series connection back one end of said transformer, the other end connects first end of said resonant capacitance, and second end of said resonant capacitance connects the negative output terminal of said front stage circuits output; Said half-bridge logical link control (LLC) resonant converter also comprises equalizer circuit, and said equalizer circuit comprises first resistance and second resistance, and the resistance of said first resistance and said second resistance equates; First end of said first resistance is connected to the positive output end of said front stage circuits output, and first end of said second resistance is connected to the negative output terminal of said front stage circuits output; Second end of said first resistance and first end that is connected to said resonant capacitance after second end of said second resistance links to each other, or, the said resonant inductance end that links to each other with the primary coil series connection of said transformer, or, the mid point of said half-bridge circuit.
In the optimized technical scheme,
Said half-bridge logical link control (LLC) resonant converter also comprises clamp circuit, and said clamp circuit comprises first diode and second diode, and the negative electrode of said first diode connects first end of said first resistance, and anode connects second end of said first resistance; The anode of said second diode connects first end of said second resistance, and negative electrode connects second end of said second resistance.
The beneficial effect of the utility model and prior art contrast is:
The half-bridge logical link control (LLC) resonant converter of the utility model; Increase equalizer circuit in the circuit; Make the voltage at resonant body electric capacity two ends be pre-charged to the half the of front stage circuits output end voltage; Thereby the electric current that make to start in the moment resonant body is more steady to the transformation of another direction from a direction, and promptly to constitute the current ratio that flows through in the body diode of switching tube in loop more steady with resonant body, thereby improves the reliability of startup moment of half-bridge logical link control (LLC) resonant converter.The selection flexibility of the switching tube of circuit own is higher, and the metal-oxide-semiconductor that can select not contain fast recovery body diode is applied in the circuit, therefore also can reduce the cost of circuit itself.
Description of drawings
Fig. 1 is the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in the prior art;
Fig. 2 is the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in the utility model embodiment one;
Fig. 3 is the startup moment course of work sketch map that increases in the former limit circuit of half-bridge logical link control (LLC) resonant converter in the utility model embodiment one before the equalizer circuit;
Fig. 4 is the startup moment course of work sketch map that increases in the former limit circuit of half-bridge logical link control (LLC) resonant converter in the utility model embodiment one after the equalizer circuit;
Fig. 5 is the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in the utility model embodiment two;
Fig. 6 is the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in the utility model embodiment three;
Fig. 7 is the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in the utility model embodiment four;
Fig. 8 is the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in the utility model embodiment five;
Fig. 9 is the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in the utility model embodiment six;
Figure 10 is the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in the utility model embodiment seven.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the utility model is explained further details.
Embodiment one
As shown in Figure 2, be the former limit circuit diagram of half-bridge logical link control (LLC) resonant converter in this embodiment.Half-bridge logical link control (LLC) resonant converter comprises former limit circuit, and former limit circuit comprises half-bridge circuit 100, resonant body 200 and equalizer circuit 300.
Half-bridge circuit 100 comprises the first switching tube Q1 and second switch pipe Q2.Wherein, the first switching tube Q1 and second switch pipe Q2 are composed in series half-bridge circuit 100, and an end of half-bridge circuit 100 connects the positive output end of front stage circuits output Vi, and the other end connects the negative output terminal of front stage circuits output Vi.Diode DS1, DS2 are respectively the body diode of the first switching tube Q1 and second switch pipe Q2.
Get front stage circuits output Vi size and be 400V, analyze half-bridge logical link control (LLC) resonant converter in this embodiment one before increasing equalizer circuit with the course of work that increases the startup moment after the equalizer circuit.
Increase equalizer circuit half-bridge logical link control (LLC) resonant converter before; The drive signal that control end applied of the first switching tube Q1 and second switch pipe Q2 is as shown in Figure 3 shown in P-Q1 and the P-Q2; Signal P-Q1 is the drive signal that control end applied of the first switching tube Q1 among the figure; Signal P-Q2 is the drive signal that control end applied of second switch pipe Q2, and signal P-Q1 and signal P-Q2 drive the first switching tube Q1 and second switch pipe Q2 conducting at interval, and interval Dead Time before and after both conductings.The course of work that increases circuit start moment of half-bridge logical link control (LLC) resonant converter before the equalizer circuit is:
As shown in Figure 3, starting constantly is the t0 moment, before the startup; Be that t0 is before the moment; The first switching tube Q1 and all not conductings of second switch pipe Q2, half-bridge circuit mid point (being A point among Fig. 2) is zero with the voltage of first end (being B point among Fig. 2) of resonant capacitance CS, does not have electric current to flow through in the resonant body 200.
T0 started during the moment, second switch pipe Q2 conducting in t0～t1 time period, and the A point voltage still is zero; And this moment, the B point voltage still was zero; The voltage that then is applied to transformer primary coil T-A resonant inductance L S two ends is A, B two point voltage differences, still is zero, does not then have electric current to flow through in the resonant body 200.
Be Dead Time (i.e. the first switching tube Q1 and second switch pipe Q2 the timing definition of not conducting be Dead Time) that because switching tube Q1 and all not conductings of Q2, resonant body 200 interior electric currents still are zero in t1～t2 time period.
The first switching tube Q1 conducting in t2～t3 time period, the instantaneous 400V of becoming of the voltage that A is ordered, and this moment, the B point voltage still was zero; The voltage that then is applied to primary coil T-A resonant inductance L S two ends is 400V, the resonant body 200 electric current I L that flows through, and direction is: A point → resonant inductance LS → transformer primary coil T-A → B point → resonant capacitance CS → ground is (convenient for describing; This direction is defined as forward; The sense of current that flows through in the subsequent descriptions resonant body 200 is in the opposite direction therewith then to be called oppositely), size is for increasing to I1 by zero forward, and the value of I1 is about (400V*T1)/(LT+LS); Wherein T1 is the time of the first switching tube Q1 conducting, and LT is the leakage inductance of transformer.
Switching tube Q1, all not conductings of Q2 in t3～t4 time period; The voltage that A is ordered is instantaneous to become 0; This moment, electric current I L can't sport zero in the resonant body 200, but slowly reduce from I1 owing to the inductance characteristic of resonant inductance LS and transformer primary coil T-A; Direction is: resonant inductance LS → transformer primary coil T-A → B point → resonant capacitance CS → second switch pipe Q2 body diode DS2 → A point still is a forward.Therefore; Flow through current IS in the second switch pipe Q2 this moment; Direction be the anode of body diode DS2 of second switch pipe Q2 to negative electrode, also promptly macroscopic view goes up source electrode for second switch pipe Q2 to drain (electric current of this direction of second switch pipe Q2 being defined as oppositely the sense of current that flows through on the subsequent descriptions second switch pipe Q2 forward that then is called in the opposite direction therewith); Size promptly with electric current I L in the resonant body, reduces from I1.
Second switch pipe Q2 conducting in t4～t5 time period, the voltage that A is ordered still is 0, and electric current I L continues to reduce in the resonant body 200, and direction is: resonant inductance LS → transformer primary coil T-A → B point → resonant capacitance CS → second switch pipe Q2 → A point still is a forward.And electric current also reduces in the second switch pipe Q2.
Switching tube Q1, all not conductings of Q2 in t5～t6 time period; The voltage that A is ordered still is 0; Then electric current I L still continues in the resonant body 200; Be decreased to I2, direction is: resonant inductance LS → transformer primary coil T-A → B point → resonant capacitance CS → second switch pipe Q2 body diode DS2 → A point still is a forward.Electric current in the second switch pipe Q2 (also be electric current in the body diode DS2 this moment) also reduces, and is decreased to I2.
T6 is during the moment; The first switching tube Q1 conducting; The instantaneous 400V of becoming of the voltage that A is ordered, then the body diode DS2 of second switch pipe Q2 is by the instantaneous reverse voltage that applies 400V, and because body diode DS2 is opposite with the current voltage direction that applies at the sense of current of t6 before constantly; Body diode DS2 will accomplish current reversal and end under very high energies is impacted; The flow through body diode DS2 of the first switching tube Q1 and second switch pipe Q2 of very big electric current is arranged this moment, and the value I3 that reaches of the electric current of this moment can be far longer than electric current I 1, the I2 that resonant body flows through before usually, and two switching tubes are caused very big energy impact; If the body diode DS2 that second opens the light manages Q2 is quick-recovery soon, then switching tube will burn in moment.
According to the above-mentioned startup job analysis of moment, it is not high to increase equalizer circuit half-bridge logical link control (LLC) resonant converter startup moment reliability before, must the fast body diode that recovers of select tape.
Increase equalizer circuit half-bridge logical link control (LLC) resonant converter afterwards; The drive signal that control end applied of the first switching tube Q1 and second switch pipe Q2 still is P-Q1 and P-Q2; Promptly the first switching tube Q1 and second switch pipe Q2 are still driven conducting at interval, and interval Dead Time before and after both conductings.The course of work that increases circuit start moment of half-bridge logical link control (LLC) resonant converter after the equalizer circuit is:
As shown in Figure 4; Starting constantly is the t0 moment, and before the startup, promptly t0 is before the moment; Because the existence of the equalizer circuit that first resistance R 1 and second resistance R 2 are formed; The voltage that A point and B are ordered all is recharged to 200V, and because the first switching tube Q1 and all not conductings of second switch pipe Q2 at this moment, so do not have electric current to flow through in the resonant body 200.
T0 started during the moment, second switch pipe Q2 conducting in t0～t1 time period, and the A point voltage is zero; And this moment, the B point voltage was 200V, and the voltage that then is applied to transformer primary coil T-A resonant inductance L S two ends is A, B two point voltage differences, for-200V; The electric current I L that then flows through in the resonant body 200, direction is: B point → transformer primary coil T-A → resonant inductance LS → A point → second switch pipe Q2 → resonant capacitance CS, direction is reverse; Size is for oppositely increasing to I11 by zero; The value of I11 is about (200V*T2)/(LT+LS), and wherein T2 is the time of second switch pipe Q2 conducting, and LT is the leakage inductance of transformer.Flow through current IS in the second switch pipe Q2 this moment, and direction is the drain-to-source of second switch pipe Q2, is forward, and size increases to I11 promptly with electric current I L in the resonant body from zero.
T1～t2 is in the time period; Switching tube Q1, all not conductings of Q2; And because the inductance characteristic of resonant inductance LS and transformer primary coil T-A, electric current I L can't suddenly change in the resonant body 200, can force electric current to flow out from the body diode DS1 of the first switching tube Q1; The A point voltage is instantaneous to be become about 400V, and then electric current I L reduces from I11 in the resonant body 200.And not conducting of second switch pipe Q2 this moment, and body diode DS2 do not participate in work yet, so to flow through current IS in it be zero.
The first switching tube Q1 conducting in t2～t3 time period; Become 400V before the voltage that A is ordered; Then the first switching tube Q1 can realize ZVS (no-voltage is open-minded), and this moment, the B point voltage was 200V, and the voltage that then is applied to transformer primary coil T-A resonant inductance L S two ends is 200V; The resonant body 200 electric current I L that flows through can continue to be decreased to the zero passage forward and increase and be I22.And two not conductings of switching tube Q2 this moment, and body diode DS2 do not participate in work yet, so to flow through current IS in it still be zero.
Switching tube Q1, all not conductings of Q2 in t3～t4 time period, the voltage that A is ordered is instantaneous to become 0, and this moment, resonant body 200 interior electric current I L can't sport zero, but slowly reduced from I22, and direction still is a forward.Can the flow through body diode DS2 of second switch pipe Q2 of this forward current also is reverse electric current, and promptly with electric current I L in the resonant body, its value is for to reduce from current value I 22 for size.
Second switch pipe Q2 conducting in t4～t5 time period; Become 0 before the voltage that A is ordered; Then but second switch pipe Q2 realizes ZVS, and this moment, the B point voltage was 200V, and the voltage that then is applied to transformer primary coil T-A resonant inductance L S two ends is-200V; Therefore the resonant body 200 electric current I L that flows through can continue to be decreased to reverse increase of zero passage and be I33.And the second switch pipe Q2 conducting of this stage, so the current IS of second switch pipe Q2 can increase from reverse zero passage forward and be current value I 33, gets back to t1 situation constantly this moment.
When t5 arrives constantly, promptly get into next work period t5～switching tube Q1, all not conductings of Q2 in t9 time period: t5～t6 time period, this stage repeats the course of work in t1～t2 time period; T6～t7 interior first switching tube Q1 conducting of section constantly, this stage repeats the course of work in t2～t3 time period; T7～t8 is the interior switching tube Q1 of section, all not conductings of Q2 constantly, and this stage repeats the course of work in t3～t4 time period; T8～t9 interior second switch pipe Q2 conducting of section constantly, this stage repeats the course of work in t4～t5 time period.
According to the above-mentioned startup job analysis of moment; Increase after the equalizer circuit; The electric current that starts in the moment resonant body is more steady to the transformation of another direction from a direction; The sense of current and the opposite situation of the current voltage direction that applies on the switching tube can not occur being applied to, thereby the reliability of startup moment of half-bridge logical link control (LLC) resonant converter improves, switching tube is the body diode of the fast recovery of select tape necessarily.And, therefore also can reduce the cost of circuit itself because the metal-oxide-semiconductor that switching tube can be selected not contain fast recovery body diode is applied in the circuit.
Embodiment two
The difference of half-bridge logical link control (LLC) resonant converter of this embodiment and embodiment one is: also comprise clamp circuit 400 in this execution mode.
As shown in Figure 5; Former limit circuit diagram for the half-bridge logical link control (LLC) resonant converter in this embodiment; Former limit circuit also comprises clamp circuit 400; Clamp circuit comprises the first diode D1 and the second diode D2, and the negative electrode of the first diode D1 connects first end of first resistance R 1, and anode is connected to second end of first resistance R 1; The anode of the second diode D2 connects first end of second resistance R 2, and negative electrode connects second end of second resistance R 2.
Increase clamp circuit in the half-bridge logical link control (LLC) resonant converter of this embodiment; Make the voltage on the resonant capacitance CS distinguished clamper about 400V or 0V through clamp circuit; When transient workings such as load switching, output short-circuit, the first switching tube Q1, second switch pipe Q2 are played the effect of overload protection.
Embodiment three
The half-bridge logical link control (LLC) resonant converter of this embodiment is with the difference of embodiment one: equalizer circuit 300 link positions are different, i.e. second end of first resistance R 1 and the end that links to each other that is connected to resonant inductance LS and transformer primary coil T-A after second end of second resistance R 2 links to each other.
As shown in Figure 6; Former limit circuit diagram for the half-bridge logical link control (LLC) resonant converter in this embodiment; The equalizer circuit 200 of former limit circuit; First end of first resistance R 1 still is connected to the positive output end of front stage circuits output Vi, and first end of second resistance R 2 still is connected to the negative output terminal of front stage circuits output Vi, but second end of first resistance R 1 and the end that links to each other that is connected to resonant inductance LS and transformer primary coil T-A after second end of second resistance R 2 links to each other.Equalizer circuit is connected the end that links to each other of resonant inductance LS and transformer primary coil T-A; Can the voltage that A point and B are ordered be precharged to 200V equally; Then the circuit working process is still with in the embodiment one, still can improve the reliability of startup moment of half-bridge logical link control (LLC) resonant converter.
Embodiment four
The half-bridge logical link control (LLC) resonant converter of this embodiment is with the difference of embodiment one: equalizer circuit 300 link positions are different, i.e. second end of first resistance R 1 and the mid point that is connected to half-bridge circuit after second end of second resistance R 2 links to each other.
As shown in Figure 7; Former limit circuit diagram for the half-bridge logical link control (LLC) resonant converter in this embodiment; The equalizer circuit 200 of former limit circuit; First end of first resistance R 1 still is connected to the positive output end of front stage circuits output Vi, and first end of second resistance R 2 still is connected to the negative output terminal of front stage circuits output Vi, but second end of first resistance R 1 and the mid point that is connected to half-bridge circuit 100 after second end of second resistance R 2 links to each other.Equalizer circuit is connected the mid point of half-bridge circuit 100, can the voltage that A point and B are ordered be precharged to 200V equally, then the circuit working process is still with in the embodiment one, still can improve the reliability of startup moment of half-bridge logical link control (LLC) resonant converter.
Embodiment five
The half-bridge logical link control (LLC) resonant converter of this embodiment is with the difference of embodiment one: the transformer primary coil T-A form of connecting with resonant inductance LS is different in the resonant body 200.
As shown in Figure 8; Former limit circuit diagram for the half-bridge logical link control (LLC) resonant converter in this embodiment; In the resonant body 200 of former limit circuit; First end of transformer primary coil T-A connects the mid point of half-bridge circuit 100, and second end of transformer primary coil T-A connects first end of resonant inductance LS, and second end of resonant inductance LS connects first end of resonant capacitance CS.Second end of first resistance R 1 and first end that is connected to resonant capacitance CS after second end of second resistance R 2 links to each other.Though resonant body 200 interior transformer primary coil T-A are different with resonant inductance LS series connection form; In resonance converter when work, can be precharged to 200V with the voltage that A point and B are ordered equally; Then the circuit working process is still with in the embodiment one, still can improve the reliability of startup moment of half-bridge logical link control (LLC) resonant converter.
Embodiment six
The half-bridge logical link control (LLC) resonant converter of this embodiment is with the difference of embodiment five: equalizer circuit 300 link positions are different, i.e. second end of first resistance R 1 and the end that links to each other that is connected to resonant inductance LS and transformer primary coil T-A after second end of second resistance R 2 links to each other.As shown in Figure 9; Be the former limit circuit diagram of the half-bridge logical link control (LLC) resonant converter in this embodiment, second end of first resistance R 1 and the continuous end that is connected to transformer primary coil T-A resonant inductance L S after second end of second resistance R 2 links to each other in the equalizer circuit 200 of former limit circuit.This circuit working process is still with embodiment five, still can improve the reliability of startup moment of half-bridge logical link control (LLC) resonant converter.
Embodiment seven
The half-bridge logical link control (LLC) resonant converter of this embodiment is with the difference of embodiment five: equalizer circuit 300 link positions are different, i.e. second end of first resistance R 1 and the mid point that is connected to half-bridge circuit after second end of second resistance R 2 links to each other.Shown in figure 10, be the former limit circuit diagram of the half-bridge logical link control (LLC) resonant converter in this embodiment, second end of first resistance R 1 and the mid point that is connected to half-bridge circuit 100 after second end of second resistance R 2 links to each other in the equalizer circuit 200 of former limit circuit.This circuit working process is still with embodiment five, still can improve the reliability of startup moment of half-bridge logical link control (LLC) resonant converter.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, make some substituting or obvious modification under the prerequisite of the utility model design not breaking away from, and performance or purposes are identical, all should be regarded as belonging to the protection range of the utility model.
Claims (8)
1. a half-bridge logical link control (LLC) resonant converter comprises former limit circuit, and said former limit circuit comprises primary coil (T-A) the resonant electric capacity (CS) of first switching tube (Q1), second switch pipe (Q2), resonant inductance (LS), transformer; Said first switching tube (Q1) and second switch pipe (Q2) are composed in series half-bridge circuit, and an end of said half-bridge circuit connects the positive output end of front stage circuits output, and the other end connects the negative output terminal of said front stage circuits output; Said resonant inductance (LS) is connected the mid point of said half-bridge circuit with primary coil (T-A) series connection back one end of said transformer; The other end connects first end of said resonant capacitance (CS), and second end of said resonant capacitance (CS) connects the negative output terminal of said front stage circuits output; It is characterized in that: said half-bridge logical link control (LLC) resonant converter also comprises equalizer circuit, and said equalizer circuit comprises first resistance (R1) and second resistance (R2), and the resistance of said first resistance (R1) and said second resistance (R2) equates; First end of said first resistance (R1) is connected to the positive output end of said front stage circuits output, and first end of said second resistance (R2) is connected to the negative output terminal of said front stage circuits output; Second end of said first resistance (R1) and first end that is connected to said resonant capacitance (CS) after second end of said second resistance (R2) links to each other; Or; Primary coil (T-A) series connection of said resonant inductance (LS) and the said transformer end that links to each other, or, the mid point of said half-bridge circuit.
2. half-bridge logical link control (LLC) resonant converter according to claim 1; It is characterized in that: said half-bridge logical link control (LLC) resonant converter also comprises clamp circuit; Said clamp circuit comprises first diode (D1) and second diode (D2); The negative electrode of said first diode (D1) connects first end of said first resistance (R1), and anode connects second end of said first resistance (R1); The anode of said second diode (D2) connects first end of said second resistance (R2), and negative electrode connects second end of said second resistance (R2).
3. half-bridge logical link control (LLC) resonant converter according to claim 1; It is characterized in that: first end of said resonant inductance (LS) connects the mid point of said half-bridge circuit; Second end of said resonant inductance (LS) connects first end of the primary coil (T-A) of said transformer, and second end of the primary coil of said transformer (T-A) connects first end of said resonant capacitance (CS); Second end of said first resistance (R1) and first end that is connected to said resonant capacitance (CS) after second end of said second resistance (R2) links to each other.
4. half-bridge logical link control (LLC) resonant converter according to claim 1; It is characterized in that: first end of said resonant inductance (LS) connects the mid point of said half-bridge circuit; Second end of said resonant inductance (LS) connects first end of the primary coil (T-A) of said transformer, and second end of the primary coil of said transformer (T-A) connects first end of said resonant capacitance (CS); Second end of said first resistance (R1) and the end that links to each other that is connected to the primary coil (T-A) of said resonant inductance (LS) and said transformer after second end of said second resistance (R2) links to each other.
5. half-bridge logical link control (LLC) resonant converter according to claim 1; It is characterized in that: first end of said resonant inductance (LS) connects the mid point of said half-bridge circuit; Second end of said resonant inductance (LS) connects first end of the primary coil (T-A) of said transformer, and second end of the primary coil of said transformer (T-A) connects first end of said resonant capacitance (CS); Second end of said first resistance (R1) and the mid point that is connected to said half-bridge circuit after second end of said second resistance (R2) links to each other.
6. half-bridge logical link control (LLC) resonant converter according to claim 1; It is characterized in that: first end of the primary coil of said transformer (T-A) connects the mid point of said half-bridge circuit; Second end of the primary coil of said transformer (T-A) connects first end of said resonant inductance (LS), and second end of said resonant inductance (LS) connects first end of said resonant capacitance (CS); Second end of said first resistance (R1) and first end that is connected to said resonant capacitance (CS) after second end of said second resistance (R2) links to each other.
7. half-bridge logical link control (LLC) resonant converter according to claim 1; It is characterized in that: first end of the primary coil of said transformer (T-A) connects the mid point of said half-bridge circuit; Second end of the primary coil of said transformer (T-A) connects first end of said resonant inductance (LS), and second end of said resonant inductance (LS) connects first end of said resonant capacitance (CS); Second end of said first resistance (R1) be connected to the primary coil (T-A) of said transformer and the end that links to each other of said resonant inductance (LS) after second end of said second resistance (R2) links to each other.
8. half-bridge logical link control (LLC) resonant converter according to claim 1; It is characterized in that: first end of the primary coil of said transformer (T-A) connects the mid point of said half-bridge circuit; Second end of the primary coil of said transformer (T-A) connects first end of said resonant inductance (LS), and second end of said resonant inductance (LS) connects first end of said resonant capacitance (CS); Second end of said first resistance (R1) and the mid point that is connected to said half-bridge circuit after second end of said second resistance (R2) links to each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120227442U CN202135059U (en) | 2011-06-30 | 2011-06-30 | Half-bridge LLC resonant converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120227442U CN202135059U (en) | 2011-06-30 | 2011-06-30 | Half-bridge LLC resonant converter |
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| CN202135059U true CN202135059U (en) | 2012-02-01 |
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| CN201120227442U Expired - Lifetime CN202135059U (en) | 2011-06-30 | 2011-06-30 | Half-bridge LLC resonant converter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973092A (en) * | 2014-05-16 | 2014-08-06 | 华中科技大学 | Soft start method of LLC resonant converter |
| CN110277769A (en) * | 2019-07-17 | 2019-09-24 | 上海希形科技有限公司 | LLC power input excess voltage protection and over-voltage protection method |
| CN111181405A (en) * | 2020-01-15 | 2020-05-19 | 欣旺达电子股份有限公司 | Half-bridge LLC resonant circuit and switching power supply |
| CN112087139A (en) * | 2019-06-12 | 2020-12-15 | 台达电子工业股份有限公司 | Isolated converter with high step-up ratio |
| CN112087150A (en) * | 2019-06-12 | 2020-12-15 | 台达电子工业股份有限公司 | Isolated boost converter |
| TWI760788B (en) * | 2020-07-13 | 2022-04-11 | 大陸商光寶電子（廣州）有限公司 | Converter with half-bridge circuit |
-
2011
- 2011-06-30 CN CN201120227442U patent/CN202135059U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973092A (en) * | 2014-05-16 | 2014-08-06 | 华中科技大学 | Soft start method of LLC resonant converter |
| CN103973092B (en) * | 2014-05-16 | 2016-04-20 | 华中科技大学 | A kind of soft-start method of LLC resonant converter |
| CN112087139A (en) * | 2019-06-12 | 2020-12-15 | 台达电子工业股份有限公司 | Isolated converter with high step-up ratio |
| CN112087150A (en) * | 2019-06-12 | 2020-12-15 | 台达电子工业股份有限公司 | Isolated boost converter |
| CN112087150B (en) * | 2019-06-12 | 2022-02-18 | 台达电子工业股份有限公司 | Isolated boost converter |
| CN110277769A (en) * | 2019-07-17 | 2019-09-24 | 上海希形科技有限公司 | LLC power input excess voltage protection and over-voltage protection method |
| CN111181405A (en) * | 2020-01-15 | 2020-05-19 | 欣旺达电子股份有限公司 | Half-bridge LLC resonant circuit and switching power supply |
| TWI760788B (en) * | 2020-07-13 | 2022-04-11 | 大陸商光寶電子（廣州）有限公司 | Converter with half-bridge circuit |
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