CN203911762U - LLC resonance converting device - Google Patents
LLC resonance converting device Download PDFInfo
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- CN203911762U CN203911762U CN201420300388.2U CN201420300388U CN203911762U CN 203911762 U CN203911762 U CN 203911762U CN 201420300388 U CN201420300388 U CN 201420300388U CN 203911762 U CN203911762 U CN 203911762U
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- 238000012545 processing Methods 0.000 claims description 36
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Abstract
The utility model discloses an LLC resonance converting device. The LLC resonance converting device comprises a bridge circuit, a resonance circuit, a transformer, a rectification circuit, and a filter circuit which are connected in series sequentially and also comprises an input measurement circuit, a drive circuit, a peak measurement circuit, an output measurement circuit, and a digital processor. The input measurement circuit is connected to the input end of the LLC resonance converting device and used for measuring an input voltage value and transmitting the input voltage value to the digital processor. The drive circuit is connected to the digital processor and used for converting a PWM signal into a drive level to drive the bridge circuit. The peak measurement circuit is connected to the resonance circuit and used for measuring a resonance current peak value and transmitting the resonance current peak value to the digital processor. The output measurement circuit measures an output voltage value and an output current value and transmits the output voltage value and the output current value to the digital processor. With the addition of the input measurement circuit, the input under-voltage protection is realized and the reliability of the LLC resonance converting device during the operation is improved effectively. The peak measurement circuit can show the resonance current peak value rapidly so that the over-current protection on resonance current is realized directly. The LLC resonance converting device is controlled digitally and is advantaged by simple operation, flexibly control, etc. The LLC resonance converting device is applicable to large-power and wide-output-range application occasions.
Description
Technical field
The utility model belongs to DC/DC converter field, more specifically, relates to a kind of LLC resonant transformation device.
Background technology
High efficiency, high power density, high reliability are the development trends of switch converters always, and at present, resonant type soft-switch technology has been widely used in switch converters to improve transducer effciency and power density.More than LLC controlled resonant converter is operated in resonance frequency, can realize the no-voltage conducting of input bridge-type switching tube, in certain loading range, also can realize the zero-current switching of output rectifier diode, therefore its to have efficiency high, the advantages such as volume is little, and Electro Magnetic Compatibility is good, are subject to extensive concern in recent years.
Be different from general transducer, LLC controlled resonant converter adopts pulse frequency modulated technology (Pulse Frequency Modulation, PFM), and operating frequency range is wider, and duty ratio maintains 50% all the time.By closed-loop adjustment switching frequency, maintain output voltage stabilization, there is output area wide, the advantage such as degree of regulation is high, and dynamic response is fast, is applicable to high-power, wide output area application scenario.
Yet the reliability in the reliability of LLC controlled resonant converter, particularly operation with closed ring process, need treat further solution.LLC controlled resonant converter resonant circuit dynamically very fast, and output is dynamically relatively slow, in closed-loop control process, if input voltage falls seriously, the switching frequency of closed-loop control rises to rapidly low-limit frequency, now output dynamically has little time response, easily causes resonant circuit to occur overcurrent, when serious, can damage switching tube and other circuit elements; In addition, in closed-loop adjustment process, too fast if switching frequency regulates, also easily cause resonant circuit to occur overcurrent.Prior art scheme is only by detecting output voltage and output current failure judgement, responds slowlyer, can not realize effective protection; Adopt the sampling of resonance current mean value and protection, owing to obtaining mean value, need to increase filtering link, filtering delay-time is longer, also cannot protect in time, and the relation of resonance current mean value and peak value changes with changing operate-point, is not easy definite protection value.
Utility model content
For above defect or the Improvement requirement of prior art, the utility model provides a kind of LLC resonant transformation device, has effectively improved the reliability of LLC resonant transformation device in operation with closed ring process.
The invention provides a kind of LLC resonant transformation device, comprise the bridge circuit, resonant circuit, transformer, rectification circuit and the filter circuit that are connected in series successively; Also comprise input detecting circuit, drive circuit, peak detection circuit, output detection circuit and digital processing unit; The input of described input detecting circuit is connected with the input of described bridge circuit, and the output of described input detecting circuit is connected with the first input end of described digital processing unit; The input of described peak detection circuit is connected with the link of described resonant circuit and described transformer, and the output of described peak detection circuit is connected with the second input of described digital processing unit; The input of described output detection circuit is connected with the output of described filter circuit, and the output of described output detection circuit is connected with the 3rd input of described digital processing unit; The input of described drive circuit is connected with the output of described digital processing unit, and the output of described drive circuit is connected with the control end of described bridge circuit.
Wherein, described input detecting circuit comprises the first differential amplifier circuit, the first voltage follower and a RC filter of series connection successively; And first sampling unit, filter capacitor C
inswith filter capacitor C
5; Described filter capacitor C
5be connected between the normal phase input end and ground of A1 in described the first differential amplifier circuit; Described filter capacitor C
insbe connected between the output and ground of described the first sampling unit, the input of described the first sampling unit is as the input of described input detecting circuit; The output of a described RC filter is as the output of described input detecting circuit.
Wherein, described the first sampling unit comprises the first voltage Hall device H1, resistance R
0with sampling resistor R
ins; The anodal V+ of voltage input end of described the first voltage Hall device H1 passes through resistance R
0be connected to the input of LLC resonant transformation device anodal, the voltage input end negative pole V-of described the first voltage Hall device H1 is connected to resonant transformation device input negative pole, the output of described the first voltage Hall device H1 is as the output of described the first sampling unit, and the output of described the first voltage Hall device H1 is also by described sampling resistor R
insground connection.
Wherein, described the first differential amplifier circuit comprises resistance R
1, resistance R
2, resistance R
3, resistance R
4with operational amplifier A 1; The normal phase input end of described operational amplifier A 1 is by described resistance R
1be connected to the output of described the first sampling unit, the normal phase input end of described operational amplifier A 1 is also by described resistance R
3ground connection; The inverting input of described operational amplifier A 1 is by described resistance R
2ground connection; The output of described operational amplifier A 1 is as the output of described the first differential amplifier circuit; Described resistance R
4be connected between the inverting input and output of described operational amplifier A 1.
Wherein, described the first voltage follower comprises resistance R
5, resistance R
6with operational amplifier A 2; The normal phase input end of described operational amplifier A 2 is by described resistance R
5be connected to the output of described the first differential amplifier circuit, the inverting input of described operational amplifier A 2 is by described resistance R
6be connected to its output, the output of described operational amplifier A 2 is as the output of described the first voltage follower.
Wherein, described peak detection circuit comprises CT coil, sampling resistor Rrs, capacitor C rs, half-wave rectification block and peak detection block; Described sampling resistor Rrs is connected to the output of described CT coil, and described capacitor C rs and described sampling resistor Rrs are connected in parallel; The input of described half-wave rectification block is connected to the link of described sampling resistor Rrs and described CT coil, the input of described peak detection block is connected to the output of described half-wave rectification block, and the output of described peak detection block is as the output of described peak detection circuit.
Wherein, described half-wave rectification block comprises resistance R
8, resistance R
9, resistance R
10, diode D
9, diode D
10and operational amplifier A
3; Described resistance R
8one end as the input of described half-wave rectification block, described resistance R
8the other end be connected to the inverting input of described operational amplifier A 3, the normal phase input end of described operational amplifier A 3 is by described resistance R
9ground connection; Described diode D
9anodic bonding to the inverting input of described operational amplifier A 3, described diode D
9negative electrode be connected to the output of described operational amplifier A 3; Described diode D
10anodic bonding to the output of described operational amplifier A 3, described diode D
10negative electrode as the output of described half-wave rectification block; Described resistance R
10be connected to inverting input and the described diode D of described operational amplifier A 3
10negative electrode between.
Wherein, described peak detection block comprises diode D
11, capacitor C
7, resistance R
11with operational amplifier A 4; The normal phase input end of described operational amplifier A 4 is as the input of described peak detection block, described diode D
11anodic bonding to the output of described operational amplifier A 4, described diode D
11negative electrode as the output of described peak detection block; Described diode D
11negative electrode be also connected with the inverting input of described operational amplifier A 4; Described capacitor C
7be connected to described diode D
11negative electrode and ground between; Described resistance R
11with described capacitor C
7be connected in parallel.
Wherein, described output detection circuit comprises for gathering the output voltage detecting circuit of output voltage and for gathering the output current detection circuit of output current.
Wherein, described resonant circuit comprises the inductance L of series connection successively
rand capacitor C
r; Described inductance L
rthe non-end that is connected in series as the input of described resonant circuit, described capacitor C
rthe non-end that is connected in series as the output of described resonant circuit.
Major advantage of the present utility model is:
(1) the utility model adopts digital processing unit to control, and speed is fast, controls flexibly;
(2) by increasing input detecting circuit, detect input voltage, realize input undervoltage protection and overvoltage protection, avoid when operation with closed ring, because input voltage falls the resonance current overcurrent causing, improved the reliability of LLC resonant transformation device when operation with closed ring;
(3) by increasing peak detection circuit; fast detecting resonance current peak value; directly realize the restriction protection to resonance current peak value; avoid in closed-loop adjustment process; the resonance current overcurrent causing because frequency adjustment is too fast, has improved the reliability of LLC resonant transformation device in closed-loop adjustment process.
Accompanying drawing explanation
Fig. 1 is the structural representation of the LLC resonant transformation device that provides of the utility model;
Fig. 2 is the circuit diagram of the LLC resonant transformation device that provides of the utility model;
Fig. 3 is the drive level schematic diagram that the utility model provides;
Fig. 4 is the physical circuit figure of the input detecting circuit that provides of the utility model;
Fig. 5 is the physical circuit figure of the peak detection circuit that provides of the utility model;
Fig. 6 (a) is the physical circuit figure of the output voltage detecting circuit that provides of the utility model;
Fig. 6 (b) is the physical circuit figure of the output current detection circuit that provides of the utility model;
Fig. 7 is the physical circuit figure of the drive circuit that provides of the utility model;
Fig. 8 (a) is the main program flow chart of the DSP control system that provides of the utility model;
Fig. 8 (b) is the interrupt routine flow chart of the DSP control system that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.In addition,, in each execution mode of described the utility model, involved technical characterictic just can not combine mutually as long as do not form each other conflict.
The utility model provides a kind of LLC resonant transformation device, comprises the bridge circuit of serial connection successively, resonant circuit, transformer, rectification circuit and filter circuit; And comprise input detecting circuit, output detection circuit, peak detection circuit, drive circuit and digital processing unit.Described input detecting circuit input is connected to LLC resonant transformation device input, and output is connected to digital processing unit, for Gather and input voltage; Described output detection circuit input is connected to LLC resonant transformation device output, and output is connected to digital processing unit, for gathering output voltage and output current; Described peak detection circuit input is connected to described resonant circuit, and output is connected to digital processing unit, for gathering resonance current peak value; Described drive circuit input is connected to digital processing unit, and output is connected to described bridge circuit, for driving bridge circuit.
In the utility model, the full-bridge circuit that bridge circuit can be comprised of switching device, the half-bridge circuit that also can be formed by switching device.Resonant circuit is by resonant inductance L
rwith resonance capacitor C
rcompose in series its resonance frequency
transformer can be with centre tapped high frequency transformer to form by least two, the former limit of high frequency transformer windings in series, and the centre cap of secondary winding is also connected to output negative terminal, and other taps are connected with described rectification circuit.The not control rectifying circuit that rectification circuit can adopt diode to form.Filter circuit can adopt C filtering or adopt LC filtering.Input detecting circuit consists of the amplifying circuit that comprises voltage Hall element.Peak detection circuit consists of CT transducer, precision rectifying electric current and single amplifier peak value circuit.The bridge-type totem structure that drive circuit comprises high-frequency isolation transformer and consists of MOSFET.
The utility model adopts digital processing unit to control, and speed is fast, controls flexibly; By increasing input detecting circuit, detect input voltage, realize input undervoltage protection and overvoltage protection, avoid when operation with closed ring, because input voltage falls the resonance current overcurrent causing, improved the reliability of LLC resonant transformation device when operation with closed ring; By increasing peak detection circuit; fast detecting resonance current peak value; directly realize the restriction protection to resonance current peak value; avoid in closed-loop adjustment process; the resonance current overcurrent causing because frequency adjustment is too fast, has improved the reliability of LLC resonant transformation device in closed-loop adjustment process.
As shown in Figure 1, the LLC resonant transformation device that the utility model provides comprises bridge circuit 10, resonant circuit 11, transformer 12, rectification circuit 13, the filter circuit 14 of serial connection successively, and input detecting circuit 20, drive circuit 21, peak detection circuit 22, output detection circuit 23, digital processing unit 30, after bridge circuit 10 is driven by drive level, input direct voltage is transferred to the square-wave voltage of drive level same frequency and being exported; Square-wave voltage, through resonant circuit 11, forms certain resonance impedance, produces resonance current; Resonance current flows to the former limit of transformer 12, after conversion, from transformer 12 secondary, flows out; The secondary current of 13 pairs of transformers 12 of rectification circuit carries out rectification, output half-wave current; The output current of 14 pairs of rectification circuits 13 of filter circuit carries out after filtering, output direct current powering load.Wherein, input detecting circuit 20, after input is connected with the input of bridge circuit 10, as the input of LLC resonant transformation device, output is connected to the first input end of digital processing unit 30, for Gather and input voltage Vin; The input of drive circuit 21 is connected with the output of digital processing unit 30, and output is connected with the drive end of bridge circuit 10, according to the pwm control signal of digital processing unit 30 outputs, produces drive level; The input of peak detection circuit 22 is connected to the output of resonant circuit 11, and the output of peak detection circuit 22 is connected to the second input of digital processing unit 30, for gathering resonance current; The input of output detection circuit 23 is connected to the output of filter circuit 14, and the output of output detection circuit 23 is connected to the 3rd input of digital processing unit 30, for gathering output voltage and output current; Digital processing unit 30 is exported according to the input voltage vin gathering and resonance current, and according to the output voltage gathering and output current output pwm control signal.Control the operation of described LLC resonant transformation device, in the present embodiment, adopt TMS320F2808 chip as digital processing unit.
Resonant circuit 11 is by resonant inductance L
rwith resonance capacitor C
rcompose in series its resonance frequency
As shown in Figure 2, be the circuit diagram of the LLC resonant transformation device of the utility model embodiment, comprise bridge circuit 10, resonant circuit 11, transformer 12, rectification circuit 13 and the filter circuit 14 of serial connection successively.Bridge circuit 10 comprises T1, T2, T3 and tetra-switching tubes of T4, and switch transistor T 1 to T4 all comprises MOSFET, fly-wheel diode and buffer capacitor, and MOSFET, fly-wheel diode and buffer capacitor are connected in parallel.Switch transistor T 1 and switch transistor T 2 are in same brachium pontis, switch transistor T 3 and switch transistor T 4 are in same brachium pontis, two brachium pontis are connected in the positive and negative busbar of input power, input supply voltage is 600V, and the some B that the some A that switch transistor T 1 and switch transistor T are 2 and switch transistor T 3 and switch transistor T are 4 draws and is connected to rear end resonant circuit.
Resonant circuit 11 comprises inductance L
rand capacitor C
r, inductance L
rwith capacitor C
rseries connection, inductance sense value L
r=37.07uH, capacitor's capacity C
r=23.63nF, resonance frequency is 170kHz.
Transformer 12 comprises the first transformer and the second transformer, and the first transformer and the second transformer all have three windings, and no-load voltage ratio is 26: 3: 3.The first transformer primary side winding is connected with the second transformer primary side windings in series, the first transformer secondary winding terminal s2, s3 and the second transformer secondary winding terminal s6, s7 are connected in output negative pole jointly, and winding terminal s1, s4, s5, s8 are connected to rear end rectification circuit.
Rectification circuit 13 comprises first to fourth totally four diodes, the first diode D
5positive pole be connected to the first transformer secondary terminal s1, the second diode D
6positive pole be connected to the first transformer secondary terminal s4, the 3rd diode D
7positive pole be connected to the second transformer secondary terminal s5, the 4th diode D
8positive pole be connected to the second transformer secondary terminal s8, first to fourth diode cathode is connected in output cathode jointly.
Filter circuit 14 comprises capacitor C, is connected to output both positive and negative polarity, its capacitance C=11.48mF.
As shown in Figure 3, drive level duty ratio is D ≈ 50% to the drive level of switch T1～T4, and Dead Time td fixes, and cycle T regulates by closed-loop control.
Figure 4 shows that input detecting circuit 20 embodiment, comprise the first sampling unit 201, the first filter capacitor C
ins, the first differential amplifier circuit 202, the second filter capacitor C
5, the first voltage follower 203 and a RC filter 204; Wherein the first sampling unit 201 comprises the first voltage Hall device H1, resistance R
0with sampling resistor R
ins; The first voltage Hall device H1 passes through resistance R
0and being connected to LLC resonant transformation device input both positive and negative polarity, the first voltage Hall device H1 outlet side also meets sampling resistor R
insthe current signal of voltage Hall H1 output is converted to voltage signal V
1, filter capacitor C
insand be connected to sampling resistor R
insoutput signal with level and smooth the first voltage Hall device H1; Resistance R
1, R
2, R
3, R
4and operational amplifier A 1 formation the first differential amplifier circuit 202, by voltage Hall output signal V
1carry out voltage ratio amplification, obtain a voltage V that scope is suitable
2, magnification ratio is
capacitor C
5with resistance R
3parallel connection, for to V
2further filtering; Resistance R
5, R
6and operational amplifier A 2 forms the first voltage follower 203, its output voltage V
3follow voltage V
2, increase output impedance simultaneously; Resistance R
7with capacitor C
6form RC filter 204, to voltage V
3carry out filtering, obtain comparatively clean, level and smooth voltage signal V
in_s, voltage V
in_sbe input to digital processing unit 30, by the AD module of digital processing unit inside, carry out AD conversion.
Figure 5 shows that peak detection circuit 22 embodiment, comprise CT coil, sampling resistor Rrs, capacitor C rs, half-wave rectification block 221 and peak detection block 222; Wherein the output of resonant circuit is passed from CT coil, CT turns ratio number is 1: 200, CT coil secondary output current is 1: 200 with the ratio of resonance current, and sampling resistor Rrs is connected to the output of CT coil, and the ac current signal of CT output is converted to ac voltage signal V
4, capacitor C rs is connected to sampling resistor Rrs, to voltage V
4carry out filtering; Resistance R
8, R
9, R
20with diode D
9, D
10and operational amplifier A 3 formation half-wave rectification block 221, to ac voltage signal V
4carry out halfwave rectifier, output only has the voltage signal V of positive half wave
5, diode D
11, capacitor C
7, resistance R
11and operational amplifier A 4 formation peak detection block 222, to half-wave voltage signal V
5peak value gather, output peak DC voltage signal V
rp_s, voltage V
rp_sbe input to digital processing unit 30, by the AD module of digital processing unit 30 inside, carry out AD conversion.
Figure 6 shows that output detection circuit 23 embodiment, wherein, (a) be output voltage detecting circuit 231, is (b) output current detection circuit 232.Wherein output voltage detecting circuit 231 comprises the second sampling unit 2311, filter capacitor C
os, the second differential amplifier circuit 2312, capacitor C
8, second voltage follower 2313 and the 2nd RC filter 2314; Wherein the second sampling unit 2311 comprises second voltage Hall H2, resistance R
12with sampling resistor R
os; Voltage Hall H2 passes through resistance R
12and being connected to LLC resonant transformation device output both positive and negative polarity, voltage Hall H2 outlet side also meets sampling resistor R
osthe current signal of voltage Hall H2 output is converted to voltage signal V
6, filter capacitor C
osand be connected to R
osoutput signal with smooth voltage Hall H2; Resistance R
13, R
14, R
15, R
16and operational amplifier A 5 formation the second differential amplifier circuits 2312, by voltage Hall output signal V
6carry out voltage ratio amplification, obtain a voltage V that scope is suitable
7, magnification ratio is
capacitor C
8with R
15parallel connection, to V
6further filtering; Resistance R
17, R
18and operational amplifier A 6 forms second voltage follower 2313, its output voltage V
8follow voltage V
7, increase output impedance simultaneously; Resistance R
19with capacitor C
9form the 2nd RC filter 2314, to voltage V
8carry out filtering, obtain comparatively clean, level and smooth voltage signal V
o_s, voltage V
o_sbe input to digital processing unit 30, by the AD module of digital processing unit inside, carry out AD conversion.
Output current detection circuit 232 comprises the 3rd sampling unit 2321, sampling resistor R
os1, the 3rd differential amplifier circuit 2322, capacitor C 10, tertiary voltage follower 2323 and the 3rd RC filter 2324; Wherein the 3rd sampling unit 2321 comprises the 3rd current Hall H3 and sampling resistor R
os1; Wherein the 3rd current Hall H3 is serially connected in output, and its outlet side also meets sampling resistor R
os1the current signal of current Hall H3 output is converted to voltage signal V
9, filter capacitor C
os1and be connected to R
os1output signal with smoothing current Hall H3; Resistance R
20, R
21, R
22, R
23and operational amplifier A 7 formation the 3rd differential amplifier circuits 2322, by current Hall output signal V
9carry out voltage ratio amplification, obtain a voltage V that scope is suitable
10, magnification ratio is
capacitor C
10with R
22parallel connection, to V
9further filtering; Resistance R
24, R
25and operational amplifier A 8 forms tertiary voltage follower 2323, its output voltage V
11follow voltage V
10, increase output impedance simultaneously; Resistance R
26with capacitor C
11form the 3rd RC filter 2324, to voltage V
11carry out filtering, obtain comparatively clean, level and smooth voltage signal I
o_s, voltage I
o_sbe input to digital processing unit 30, by the AD module of digital processing unit inside, carry out AD conversion.
Figure 7 shows that drive circuit embodiment, DRIVE_H, DRIVE-L are respectively the two-way pwm signal that digital processing unit sends, and cycle and the duty ratio of DRIVE_H and DRIVE_L are identical, 180 ° of phase phasic differences.The former limit of drive circuit has adopted high speed MOSFET Q1～Q4 and capacitor C
d1～C
d8the totem pillar pushing structure forming, the pwm signal DRIVE_H that can send digital processing unit 30 and DRIVE_L realize and switching fast and power amplification.Drive circuit secondary Q5～Q8 forms repid discharge loop to drive level G1～G4 respectively, and after driving the turn-off time to accelerate drive level, turn-off on edge.
The DSP control system flow chart that Figure 8 shows that the utility model embodiment, wherein, (a) is main program flow chart, is (b) interrupt routine flow chart.When described LLC resonant transformation device starts, first enter main program, as shown in (a), after carrying out DSP initialization, initialization of variable and drift correction, main program enters endless loop, and in loop body, DSP constantly carries out logic judgement and the inquiry of communicating by letter.The Main Function of logic judgement is the running status of the described LLC resonant transformation device of judgement and controls the conversion between each state; The Main Function of communication inquiry is the communication of controlling DSP and host computer.The operation with closed ring of described LLC resonant transformation device is realized by interrupt routine, as shown in (b), DSP carries out once this interrupt routine every 15us, in entering, have no progeny, first DSP reads the AD result of each sampling quantity, then carries out fault judgement, and fault comprises input undervoltage fault, input overvoltage fault, resonance current over current fault, output overvoltage fault, output overcurrent fault, finally carry out operational mode judgement, according to judged result, carry out voltage close loop control or current closed-loop control.
The LLC resonant transformation device that the utility model provides adopts digital processing unit to control, and speed is fast, controls flexibly; By increasing input detecting circuit, detect input voltage, realize input undervoltage protection and overvoltage protection, avoid when operation with closed ring, because input voltage falls the resonance current overcurrent causing; By increasing peak detection circuit, detect resonance current peak value, directly realize the restriction protection to resonance current peak value, avoid in closed-loop adjustment process the resonance current overcurrent causing because frequency adjustment is too fast.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. a LLC resonant transformation device, is characterized in that, comprises the bridge circuit (10), resonant circuit (11), transformer (12), rectification circuit (13) and the filter circuit (14) that are connected in series successively; It is characterized in that, also comprise input detecting circuit (20), drive circuit (21), peak detection circuit (22), output detection circuit (23) and digital processing unit (30);
The input of described input detecting circuit (20) is connected with the input of described bridge circuit (10), and the output of described input detecting circuit (20) is connected with the first input end of described digital processing unit (30);
The input of described peak detection circuit (22) is connected with the link of described transformer (12) with described resonant circuit (11), and the output of described peak detection circuit (22) is connected with the second input of described digital processing unit (30);
The input of described output detection circuit (23) is connected with the output of described filter circuit (14), and the output of described output detection circuit (23) is connected with the 3rd input of described digital processing unit (30);
The input of described drive circuit (21) is connected with the output of described digital processing unit (30), and the output of described drive circuit (21) is connected with the control end of described bridge circuit (10).
2. LLC resonant transformation device as claimed in claim 1, it is characterized in that, described input detecting circuit (20) comprises the first differential amplifier circuit (202), the first voltage follower (203) and a RC filter (204) of series connection successively; And first sampling unit (201), filter capacitor C
inswith filter capacitor C
5;
Described filter capacitor C
5be connected between the normal phase input end and ground of A1 in described the first differential amplifier circuit (202);
Described filter capacitor C
insbe connected between the output and ground of described the first sampling unit (201), the input of described the first sampling unit (201) is as the input of described input detecting circuit (20); The output of a described RC filter (204) is as the output of described input detecting circuit (20).
3. LLC resonant transformation device as claimed in claim 2, is characterized in that, described the first sampling unit (201) comprises the first voltage Hall device H1, resistance R
0with sampling resistor R
ins;
The anodal V+ of voltage input end of described the first voltage Hall device H1 passes through resistance R
0be connected to the input of LLC resonant transformation device anodal, the voltage input end negative pole V-of described the first voltage Hall device H1 is connected to resonant transformation device input negative pole, the output of described the first voltage Hall device H1 is as the output of described the first sampling unit (201), and the output of described the first voltage Hall device H1 is also by described sampling resistor R
insground connection.
4. LLC resonant transformation device as claimed in claim 2, is characterized in that, described the first differential amplifier circuit (202) comprises resistance R
1, resistance R
2, resistance R
3, resistance R
4with operational amplifier A 1;
The normal phase input end of described operational amplifier A 1 is by described resistance R
1be connected to the output of described the first sampling unit (201), the normal phase input end of described operational amplifier A 1 is also by described resistance R
3ground connection; The inverting input of described operational amplifier A 1 is by described resistance R
2ground connection; The output of described operational amplifier A 1 is as the output of described the first differential amplifier circuit (202); Described resistance R
4be connected between the inverting input and output of described operational amplifier A 1.
5. LLC resonant transformation device as claimed in claim 2, is characterized in that, described the first voltage follower (203) comprises resistance R
5, resistance R
6with operational amplifier A 2;
The normal phase input end of described operational amplifier A 2 is by described resistance R
5the output that is connected to described the first differential amplifier circuit (202), the inverting input of described operational amplifier A 2 is by described resistance R
6be connected to its output, the output of described operational amplifier A 2 is as the output of described the first voltage follower (203).
6. the LLC resonant transformation device as described in claim 1-5 any one, it is characterized in that, described peak detection circuit (22) comprises CT coil, sampling resistor Rrs, capacitor C rs, half-wave rectification block (221) and peak detection block (222);
Described sampling resistor Rrs is connected to the output of described CT coil, and described capacitor C rs and described sampling resistor Rrs are connected in parallel; The input of described half-wave rectification block (221) is connected to the link of described sampling resistor Rrs and described CT coil, the input of described peak detection block (222) is connected to the output of described half-wave rectification block (221), and the output of described peak detection block (222) is as the output of described peak detection circuit (22).
7. LLC resonant transformation device as claimed in claim 6, is characterized in that, described half-wave rectification block (221) comprises resistance R
8, resistance R
9, resistance R
10, diode D
9, diode D
10with operational amplifier A 3;
Described resistance R
8one end as the input of described half-wave rectification block (221), described resistance R
8the other end be connected to the inverting input of described operational amplifier A 3, the normal phase input end of described operational amplifier A 3 is by described resistance R
9ground connection;
Described diode D
9anodic bonding to the inverting input of described operational amplifier A 3, described diode D
9negative electrode be connected to the output of described operational amplifier A 3;
Described diode D
10anodic bonding to the output of described operational amplifier A 3, described diode D
10negative electrode as the output of described half-wave rectification block (221);
Described resistance R
10be connected to inverting input and the described diode D of described operational amplifier A 3
10negative electrode between.
8. LLC resonant transformation device as claimed in claim 6, is characterized in that, described peak detection block (222) comprises diode D
11, capacitor C
7, resistance R
11with operational amplifier A 4;
The normal phase input end of described operational amplifier A 4 is as the input of described peak detection block (222), described diode D
11anodic bonding to the output of described operational amplifier A 4, described diode D
11negative electrode as the output of described peak detection block (222); Described diode D
11negative electrode be also connected with the inverting input of described operational amplifier A 4;
Described capacitor C
7be connected to described diode D
11negative electrode and ground between; Described resistance R
11with described capacitor C
7be connected in parallel.
9. LLC resonant transformation device as claimed in claim 1, it is characterized in that, described output detection circuit (23) comprises output voltage detecting circuit (231) for gathering output voltage and for gathering the output current detection circuit (232) of output current.
10. LLC resonant transformation device as claimed in claim 1, is characterized in that, described resonant circuit (11) comprises the inductance L of series connection successively
rand capacitor C
r;
Described inductance L
rthe non-end that is connected in series as the input of described resonant circuit (11), described capacitor C
rthe non-end that is connected in series as the output of described resonant circuit (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420300388.2U CN203911762U (en) | 2014-06-06 | 2014-06-06 | LLC resonance converting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420300388.2U CN203911762U (en) | 2014-06-06 | 2014-06-06 | LLC resonance converting device |
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| Publication Number | Publication Date |
|---|---|
| CN203911762U true CN203911762U (en) | 2014-10-29 |
Family
ID=51786007
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420300388.2U Expired - Lifetime CN203911762U (en) | 2014-06-06 | 2014-06-06 | LLC resonance converting device |
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|---|---|
| CN (1) | CN203911762U (en) |
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| CN105006975A (en) * | 2015-08-07 | 2015-10-28 | 西南交通大学 | Frequency converting control method of LLC resonant converter and apparatus thereof |
| CN106329940A (en) * | 2016-11-07 | 2017-01-11 | 江南大学 | Double-transformer serial and parallel structure full-bridge LLC (logical link control) resonant converter |
| CN107271935A (en) * | 2017-06-29 | 2017-10-20 | 南京信息工程大学 | A kind of magnetic resonance coupling spatial high-frequency magnetic field intensity measurement apparatus and method |
| CN107707136A (en) * | 2017-10-26 | 2018-02-16 | 华南理工大学 | Full-bridge LLC mode of resonance plasma electrical sources based on SiC power devices |
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| CN105006975A (en) * | 2015-08-07 | 2015-10-28 | 西南交通大学 | Frequency converting control method of LLC resonant converter and apparatus thereof |
| CN106329940A (en) * | 2016-11-07 | 2017-01-11 | 江南大学 | Double-transformer serial and parallel structure full-bridge LLC (logical link control) resonant converter |
| CN107271935A (en) * | 2017-06-29 | 2017-10-20 | 南京信息工程大学 | A kind of magnetic resonance coupling spatial high-frequency magnetic field intensity measurement apparatus and method |
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| CN107707136A (en) * | 2017-10-26 | 2018-02-16 | 华南理工大学 | Full-bridge LLC mode of resonance plasma electrical sources based on SiC power devices |
| CN108152561A (en) * | 2018-03-14 | 2018-06-12 | 广东海明晖电子科技有限公司 | Igh-speed wire-rod production line circuit |
| CN108918982A (en) * | 2018-07-26 | 2018-11-30 | 江门市地尔汉宇电器股份有限公司 | A kind of acquisition methods of signal peak |
| CN110277836A (en) * | 2019-05-23 | 2019-09-24 | 新纳传感系统有限公司 | Wireless power transmitter and wireless power transmission system |
| CN110277836B (en) * | 2019-05-23 | 2021-04-09 | 新纳传感系统有限公司 | Wireless power transmitter and wireless power transfer system |
| CN110350795A (en) * | 2019-06-24 | 2019-10-18 | 深圳市瀚强科技股份有限公司 | A kind of control circuit |
| CN111615234A (en) * | 2020-04-23 | 2020-09-01 | 深圳深爱半导体股份有限公司 | LED drive module and LED light-emitting circuit |
| CN111682770A (en) * | 2020-06-18 | 2020-09-18 | 中南大学 | Primary side current sampling double closed-loop digital control method of active clamping forward converter |
| CN113189468A (en) * | 2021-05-13 | 2021-07-30 | 中国工程物理研究院电子工程研究所 | Health state on-line monitoring circuit and system of power device |
| CN113655318A (en) * | 2021-08-18 | 2021-11-16 | 中车青岛四方车辆研究所有限公司 | Detection device and method for LLC resonance abnormity |
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| TR01 | Transfer of patent right |
Effective date of registration: 20221026 Address after: 430000 Floor 2, Building 1, Nanhua Industrial Park, Science Park, Wuhan University of Technology, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Matrix Energy Technology Co.,Ltd. Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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